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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-05 23:10:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-05 23:10:54 -0800 |
| commit | 2e3078af2c67730c479f1d183af5b367f5d95337 (patch) | |
| tree | b7881c6c9c479aadac345df7e18e3c0e10f0811e | |
| parent | ea5c58e70c3a148ada0d3061a8f529589bb766ba (diff) | |
| parent | b3b0d09c7a2330759ac293f5269bd932439ea0ff (diff) | |
| download | linux-stable-2e3078af2c67730c479f1d183af5b367f5d95337.tar.gz linux-stable-2e3078af2c67730c479f1d183af5b367f5d95337.tar.bz2 linux-stable-2e3078af2c67730c479f1d183af5b367f5d95337.zip | |
Merge branch 'akpm' (patches from Andrew)
Merge patch-bomb from Andrew Morton:
- inotify tweaks
- some ocfs2 updates (many more are awaiting review)
- various misc bits
- kernel/watchdog.c updates
- Some of mm. I have a huge number of MM patches this time and quite a
lot of it is quite difficult and much will be held over to next time.
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (162 commits)
selftests: vm: add tests for lock on fault
mm: mlock: add mlock flags to enable VM_LOCKONFAULT usage
mm: introduce VM_LOCKONFAULT
mm: mlock: add new mlock system call
mm: mlock: refactor mlock, munlock, and munlockall code
kasan: always taint kernel on report
mm, slub, kasan: enable user tracking by default with KASAN=y
kasan: use IS_ALIGNED in memory_is_poisoned_8()
kasan: Fix a type conversion error
lib: test_kasan: add some testcases
kasan: update reference to kasan prototype repo
kasan: move KASAN_SANITIZE in arch/x86/boot/Makefile
kasan: various fixes in documentation
kasan: update log messages
kasan: accurately determine the type of the bad access
kasan: update reported bug types for kernel memory accesses
kasan: update reported bug types for not user nor kernel memory accesses
mm/kasan: prevent deadlock in kasan reporting
mm/kasan: don't use kasan shadow pointer in generic functions
mm/kasan: MODULE_VADDR is not available on all archs
...
127 files changed, 3093 insertions, 1351 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 3a9d65c912e7..1e4a6cc1b6ea 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -175,6 +175,7 @@ read the file /proc/PID/status: VmLib: 1412 kB VmPTE: 20 kb VmSwap: 0 kB + HugetlbPages: 0 kB Threads: 1 SigQ: 0/28578 SigPnd: 0000000000000000 @@ -238,6 +239,7 @@ Table 1-2: Contents of the status files (as of 4.1) VmPTE size of page table entries VmPMD size of second level page tables VmSwap size of swap usage (the number of referred swapents) + HugetlbPages size of hugetlb memory portions Threads number of threads SigQ number of signals queued/max. number for queue SigPnd bitmap of pending signals for the thread @@ -424,12 +426,15 @@ Private_Clean: 0 kB Private_Dirty: 0 kB Referenced: 892 kB Anonymous: 0 kB +AnonHugePages: 0 kB +Shared_Hugetlb: 0 kB +Private_Hugetlb: 0 kB Swap: 0 kB SwapPss: 0 kB KernelPageSize: 4 kB MMUPageSize: 4 kB -Locked: 374 kB -VmFlags: rd ex mr mw me de +Locked: 0 kB +VmFlags: rd ex mr mw me dw the first of these lines shows the same information as is displayed for the mapping in /proc/PID/maps. The remaining lines show the size of the mapping @@ -449,9 +454,14 @@ accessed. "Anonymous" shows the amount of memory that does not belong to any file. Even a mapping associated with a file may contain anonymous pages: when MAP_PRIVATE and a page is modified, the file page is replaced by a private anonymous copy. -"Swap" shows how much would-be-anonymous memory is also used, but out on -swap. +"AnonHugePages" shows the ammount of memory backed by transparent hugepage. +"Shared_Hugetlb" and "Private_Hugetlb" show the ammounts of memory backed by +hugetlbfs page which is *not* counted in "RSS" or "PSS" field for historical +reasons. And these are not included in {Shared,Private}_{Clean,Dirty} field. +"Swap" shows how much would-be-anonymous memory is also used, but out on swap. "SwapPss" shows proportional swap share of this mapping. +"Locked" indicates whether the mapping is locked in memory or not. + "VmFlags" field deserves a separate description. This member represents the kernel flags associated with the particular virtual memory area in two letter encoded manner. The codes are the following: @@ -475,7 +485,6 @@ manner. The codes are the following: ac - area is accountable nr - swap space is not reserved for the area ht - area uses huge tlb pages - nl - non-linear mapping ar - architecture specific flag dd - do not include area into core dump sd - soft-dirty flag @@ -815,9 +824,6 @@ varies by architecture and compile options. The following is from a > cat /proc/meminfo -The "Locked" indicates whether the mapping is locked in memory or not. - - MemTotal: 16344972 kB MemFree: 13634064 kB MemAvailable: 14836172 kB diff --git a/Documentation/kasan.txt b/Documentation/kasan.txt index 0d32355a4c34..aa1e0c91e368 100644 --- a/Documentation/kasan.txt +++ b/Documentation/kasan.txt @@ -1,36 +1,34 @@ -Kernel address sanitizer -================ +KernelAddressSanitizer (KASAN) +============================== 0. Overview =========== -Kernel Address sanitizer (KASan) is a dynamic memory error detector. It provides +KernelAddressSANitizer (KASAN) is a dynamic memory error detector. It provides a fast and comprehensive solution for finding use-after-free and out-of-bounds bugs. -KASan uses compile-time instrumentation for checking every memory access, -therefore you will need a gcc version of 4.9.2 or later. KASan could detect out -of bounds accesses to stack or global variables, but only if gcc 5.0 or later was -used to built the kernel. +KASAN uses compile-time instrumentation for checking every memory access, +therefore you will need a GCC version 4.9.2 or later. GCC 5.0 or later is +required for detection of out-of-bounds accesses to stack or global variables. -Currently KASan is supported only for x86_64 architecture and requires that the -kernel be built with the SLUB allocator. +Currently KASAN is supported only for x86_64 architecture and requires the +kernel to be built with the SLUB allocator. 1. Usage -========= +======== To enable KASAN configure kernel with: CONFIG_KASAN = y -and choose between CONFIG_KASAN_OUTLINE and CONFIG_KASAN_INLINE. Outline/inline -is compiler instrumentation types. The former produces smaller binary the -latter is 1.1 - 2 times faster. Inline instrumentation requires a gcc version -of 5.0 or later. +and choose between CONFIG_KASAN_OUTLINE and CONFIG_KASAN_INLINE. Outline and +inline are compiler instrumentation types. The former produces smaller binary +the latter is 1.1 - 2 times faster. Inline instrumentation requires a GCC +version 5.0 or later. Currently KASAN works only with the SLUB memory allocator. -For better bug detection and nicer report, enable CONFIG_STACKTRACE and put -at least 'slub_debug=U' in the boot cmdline. +For better bug detection and nicer reporting, enable CONFIG_STACKTRACE. To disable instrumentation for specific files or directories, add a line similar to the following to the respective kernel Makefile: @@ -42,7 +40,7 @@ similar to the following to the respective kernel Makefile: KASAN_SANITIZE := n 1.1 Error reports -========== +================= A typical out of bounds access report looks like this: @@ -119,14 +117,16 @@ Memory state around the buggy address: ffff8800693bc800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== -First sections describe slub object where bad access happened. -See 'SLUB Debug output' section in Documentation/vm/slub.txt for details. +The header of the report discribe what kind of bug happened and what kind of +access caused it. It's followed by the description of the accessed slub object +(see 'SLUB Debug output' section in Documentation/vm/slub.txt for details) and +the description of the accessed memory page. In the last section the report shows memory state around the accessed address. -Reading this part requires some more understanding of how KASAN works. +Reading this part requires some understanding of how KASAN works. -Each 8 bytes of memory are encoded in one shadow byte as accessible, -partially accessible, freed or they can be part of a redzone. +The state of each 8 aligned bytes of memory is encoded in one shadow byte. +Those 8 bytes can be accessible, partially accessible, freed or be a redzone. We use the following encoding for each shadow byte: 0 means that all 8 bytes of the corresponding memory region are accessible; number N (1 <= N <= 7) means that the first N bytes are accessible, and other (8 - N) bytes are not; @@ -139,7 +139,7 @@ the accessed address is partially accessible. 2. Implementation details -======================== +========================= From a high level, our approach to memory error detection is similar to that of kmemcheck: use shadow memory to record whether each byte of memory is safe diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 816bf2fe55f5..84c0214b64a7 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1275,6 +1275,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0. Default: 1024 + hardlockup_all_cpu_backtrace= + [KNL] Should the hard-lockup detector generate + backtraces on all cpus. + Format: <integer> + hashdist= [KNL,NUMA] Large hashes allocated during boot are distributed across NUMA nodes. Defaults on for 64-bit NUMA, off otherwise. diff --git a/Documentation/lockup-watchdogs.txt b/Documentation/lockup-watchdogs.txt index 22dd6af2e4bd..4a6e33e1af61 100644 --- a/Documentation/lockup-watchdogs.txt +++ b/Documentation/lockup-watchdogs.txt @@ -20,8 +20,9 @@ kernel mode for more than 10 seconds (see "Implementation" below for details), without letting other interrupts have a chance to run. Similarly to the softlockup case, the current stack trace is displayed upon detection and the system will stay locked up unless the default -behavior is changed, which can be done through a compile time knob, -"BOOTPARAM_HARDLOCKUP_PANIC", and a kernel parameter, "nmi_watchdog" +behavior is changed, which can be done through a sysctl, +'hardlockup_panic', a compile time knob, "BOOTPARAM_HARDLOCKUP_PANIC", +and a kernel parameter, "nmi_watchdog" (see "Documentation/kernel-parameters.txt" for details). The panic option can be used in combination with panic_timeout (this diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 6fccb69c03e7..af70d1541d3a 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -33,6 +33,7 @@ show up in /proc/sys/kernel: - domainname - hostname - hotplug +- hardlockup_all_cpu_backtrace - hung_task_panic - hung_task_check_count - hung_task_timeout_secs @@ -293,6 +294,17 @@ domain names are in general different. For a detailed discussion see the hostname(1) man page. ============================================================== +hardlockup_all_cpu_backtrace: + +This value controls the hard lockup detector behavior when a hard +lockup condition is detected as to whether or not to gather further +debug information. If enabled, arch-specific all-CPU stack dumping +will be initiated. + +0: do nothing. This is the default behavior. + +1: on detection capture more debug information. +============================================================== hotplug: diff --git a/Documentation/vm/page_migration b/Documentation/vm/page_migration index 6513fe2d90b8..fea5c0864170 100644 --- a/Documentation/vm/page_migration +++ b/Documentation/vm/page_migration @@ -92,29 +92,26 @@ Steps: 2. Insure that writeback is complete. -3. Prep the new page that we want to move to. It is locked - and set to not being uptodate so that all accesses to the new - page immediately lock while the move is in progress. +3. Lock the new page that we want to move to. It is locked so that accesses to + this (not yet uptodate) page immediately lock while the move is in progress. -4. The new page is prepped with some settings from the old page so that - accesses to the new page will discover a page with the correct settings. - -5. All the page table references to the page are converted - to migration entries or dropped (nonlinear vmas). - This decrease the mapcount of a page. If the resulting - mapcount is not zero then we do not migrate the page. - All user space processes that attempt to access the page - will now wait on the page lock. +4. All the page table references to the page are converted to migration + entries. This decreases the mapcount of a page. If the resulting + mapcount is not zero then we do not migrate the page. All user space + processes that attempt to access the page will now wait on the page lock. -6. The radix tree lock is taken. This will cause all processes trying +5. The radix tree lock is taken. This will cause all processes trying to access the page via the mapping to block on the radix tree spinlock. -7. The refcount of the page is examined and we back out if references remain +6. The refcount of the page is examined and we back out if references remain otherwise we know that we are the only one referencing this page. -8. The radix tree is checked and if it does not contain the pointer to this +7. The radix tree is checked and if it does not contain the pointer to this page then we back out because someone else modified the radix tree. +8. The new page is prepped with some settings from the old page so that + accesses to the new page will discover a page with the correct settings. + 9. The radix tree is changed to point to the new page. 10. The reference count of the old page is dropped because the radix tree diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt index 8143b9e8373d..8a282687ee06 100644 --- a/Documentation/vm/transhuge.txt +++ b/Documentation/vm/transhuge.txt @@ -170,6 +170,16 @@ A lower value leads to gain less thp performance. Value of max_ptes_none can waste cpu time very little, you can ignore it. +max_ptes_swap specifies how many pages can be brought in from +swap when collapsing a group of pages into a transparent huge page. + +/sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_swap + +A higher value can cause excessive swap IO and waste +memory. A lower value can prevent THPs from being +collapsed, resulting fewer pages being collapsed into +THPs, and lower memory access performance. + == Boot parameter == You can change the sysfs boot time defaults of Transparent Hugepage diff --git a/Documentation/vm/unevictable-lru.txt b/Documentation/vm/unevictable-lru.txt index 32ee3a67dba2..fa3b527086fa 100644 --- a/Documentation/vm/unevictable-lru.txt +++ b/Documentation/vm/unevictable-lru.txt @@ -531,83 +531,20 @@ map. try_to_unmap() is always called, by either vmscan for reclaim or for page migration, with the argument page locked and isolated from the LRU. Separate -functions handle anonymous and mapped file pages, as these types of pages have -different reverse map mechanisms. - - (*) try_to_unmap_anon() - - To unmap anonymous pages, each VMA in the list anchored in the anon_vma - must be visited - at least until a VM_LOCKED VMA is encountered. If the - page is being unmapped for migration, VM_LOCKED VMAs do not stop the - process because mlocked pages are migratable. However, for reclaim, if - the page is mapped into a VM_LOCKED VMA, the scan stops. - - try_to_unmap_anon() attempts to acquire in read mode the mmap semaphore of - the mm_struct to which the VMA belongs. If this is successful, it will - mlock the page via mlock_vma_page() - we wouldn't have gotten to - try_to_unmap_anon() if the page were already mlocked - and will return - SWAP_MLOCK, indicating that the page is unevictable. - - If the mmap semaphore cannot be acquired, we are not sure whether the page - is really unevictable or not. In this case, try_to_unmap_anon() will - return SWAP_AGAIN. - - (*) try_to_unmap_file() - linear mappings - - Unmapping of a mapped file page works the same as for anonymous mappings, - except that the scan visits all VMAs that map the page's index/page offset - in the page's mapping's reverse map priority search tree. It also visits - each VMA in the page's mapping's non-linear list, if the list is - non-empty. - - As for anonymous pages, on encountering a VM_LOCKED VMA for a mapped file - page, try_to_unmap_file() will attempt to acquire the associated - mm_struct's mmap semaphore to mlock the page, returning SWAP_MLOCK if this - is successful, and SWAP_AGAIN, if not. - - (*) try_to_unmap_file() - non-linear mappings - - If a page's mapping contains a non-empty non-linear mapping VMA list, then - try_to_un{map|lock}() must also visit each VMA in that list to determine - whether the page is mapped in a VM_LOCKED VMA. Again, the scan must visit - all VMAs in the non-linear list to ensure that the pages is not/should not - be mlocked. - - If a VM_LOCKED VMA is found in the list, the scan could terminate. - However, there is no easy way to determine whether the page is actually - mapped in a given VMA - either for unmapping or testing whether the - VM_LOCKED VMA actually pins the page. - - try_to_unmap_file() handles non-linear mappings by scanning a certain - number of pages - a "cluster" - in each non-linear VMA associated with the - page's mapping, for each file mapped page that vmscan tries to unmap. If - this happens to unmap the page we're trying to unmap, try_to_unmap() will - notice this on return (page_mapcount(page) will be 0) and return - SWAP_SUCCESS. Otherwise, it will return SWAP_AGAIN, causing vmscan to - recirculate this page. We take advantage of the cluster scan in - try_to_unmap_cluster() as follows: - - For each non-linear VMA, try_to_unmap_cluster() attempts to acquire the - mmap semaphore of the associated mm_struct for read without blocking. - - If this attempt is successful and the VMA is VM_LOCKED, - try_to_unmap_cluster() will retain the mmap semaphore for the scan; - otherwise it drops it here. - - Then, for each page in the cluster, if we're holding the mmap semaphore - for a locked VMA, try_to_unmap_cluster() calls mlock_vma_page() to - mlock the page. This call is a no-op if the page is already locked, - but will mlock any pages in the non-linear mapping that happen to be - unlocked. - - If one of the pages so mlocked is the page passed in to try_to_unmap(), - try_to_unmap_cluster() will return SWAP_MLOCK, rather than the default - SWAP_AGAIN. This will allow vmscan to cull the page, rather than - recirculating it on the inactive list. - - Again, if try_to_unmap_cluster() cannot acquire the VMA's mmap sem, it - returns SWAP_AGAIN, indicating that the page is mapped by a VM_LOCKED - VMA, but couldn't be mlocked. +functions handle anonymous and mapped file and KSM pages, as these types of +pages have different reverse map lookup mechanisms, with different locking. +In each case, whether rmap_walk_anon() or rmap_walk_file() or rmap_walk_ksm(), +it will call try_to_unmap_one() for every VMA which might contain the page. + +When trying to reclaim, if try_to_unmap_one() finds the page in a VM_LOCKED +VMA, it will then mlock the page via mlock_vma_page() instead of unmapping it, +and return SWAP_MLOCK to indicate that the page is unevictable: and the scan +stops there. + +mlock_vma_page() is called while holding the page table's lock (in addition +to the page lock, and the rmap lock): to serialize against concurrent mlock or +munlock or munmap system calls, mm teardown (munlock_vma_pages_all), reclaim, +holepunching, and truncation of file pages and their anonymous COWed pages. try_to_munlock() REVERSE MAP SCAN @@ -623,29 +560,15 @@ all PTEs from the page. For this purpose, the unevictable/mlock infrastructure introduced a variant of try_to_unmap() called try_to_munlock(). try_to_munlock() calls the same functions as try_to_unmap() for anonymous and -mapped file pages with an additional argument specifying unlock versus unmap +mapped file and KSM pages with a flag argument specifying unlock versus unmap processing. Again, these functions walk the respective reverse maps looking -for VM_LOCKED VMAs. When such a VMA is found for anonymous pages and file -pages mapped in linear VMAs, as in the try_to_unmap() case, the functions -attempt to acquire the associated mmap semaphore, mlock the page via -mlock_vma_page() and return SWAP_MLOCK. This effectively undoes the -pre-clearing of the page's PG_mlocked done by munlock_vma_page. - -If try_to_unmap() is unable to acquire a VM_LOCKED VMA's associated mmap -semaphore, it will return SWAP_AGAIN. This will allow shrink_page_list() to -recycle the page on the inactive list and hope that it has better luck with the -page next time. - -For file pages mapped into non-linear VMAs, the try_to_munlock() logic works -slightly differently. On encountering a VM_LOCKED non-linear VMA that might -map the page, try_to_munlock() returns SWAP_AGAIN without actually mlocking the -page. munlock_vma_page() will just leave the page unlocked and let vmscan deal -with it - the usual fallback position. +for VM_LOCKED VMAs. When such a VMA is found, as in the try_to_unmap() case, +the functions mlock the page via mlock_vma_page() and return SWAP_MLOCK. This +undoes the pre-clearing of the page's PG_mlocked done by munlock_vma_page. Note that try_to_munlock()'s reverse map walk must visit every VMA in a page's reverse map to determine that a page is NOT mapped into any VM_LOCKED VMA. -However, the scan can terminate when it encounters a VM_LOCKED VMA and can -successfully acquire the VMA's mmap semaphore for read and mlock the page. +However, the scan can terminate when it encounters a VM_LOCKED VMA. Although try_to_munlock() might be called a great many times when munlocking a large region or tearing down a large address space that has been mlocked via mlockall(), overall this is a fairly rare event. @@ -673,11 +596,6 @@ Some examples of these unevictable pages on the LRU lists are: (3) mlocked pages that could not be isolated from the LRU and moved to the unevictable list in mlock_vma_page(). - (4) Pages mapped into multiple VM_LOCKED VMAs, but try_to_munlock() couldn't - acquire the VMA's mmap semaphore to test the flags and set PageMlocked. - munlock_vma_page() was forced to let the page back on to the normal LRU - list for vmscan to handle. - shrink_inactive_list() also diverts any unevictable pages that it finds on the inactive lists to the appropriate zone's unevictable list. diff --git a/arch/alpha/include/uapi/asm/mman.h b/arch/alpha/include/uapi/asm/mman.h index 0086b472bc2b..f2f949671798 100644 --- a/arch/alpha/include/uapi/asm/mman.h +++ b/arch/alpha/include/uapi/asm/mman.h @@ -37,6 +37,9 @@ #define MCL_CURRENT 8192 /* lock all currently mapped pages */ #define MCL_FUTURE 16384 /* lock all additions to address space */ +#define MCL_ONFAULT 32768 /* lock all pages that are faulted in */ + +#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ #define MADV_NORMAL 0 /* no further special treatment */ #define MADV_RANDOM 1 /* expect random page references */ diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c index 00b7f7de28a1..7d5f4c736a16 100644 --- a/arch/arm/mm/alignment.c +++ b/arch/arm/mm/alignment.c @@ -803,7 +803,7 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs) } } } else { - fault = probe_kernel_address(instrptr, instr); + fault = probe_kernel_address((void *)instrptr, instr); instr = __mem_to_opcode_arm(instr); } diff --git a/arch/mips/include/uapi/asm/mman.h b/arch/mips/include/uapi/asm/mman.h index cfcb876cae6b..97c03f468924 100644 --- a/arch/mips/include/uapi/asm/mman.h +++ b/arch/mips/include/uapi/asm/mman.h @@ -61,6 +61,12 @@ */ #define MCL_CURRENT 1 /* lock all current mappings */ #define MCL_FUTURE 2 /* lock all future mappings */ +#define MCL_ONFAULT 4 /* lock all pages that are faulted in */ + +/* + * Flags for mlock + */ +#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ #define MADV_NORMAL 0 /* no further special treatment */ #define MADV_RANDOM 1 /* expect random page references */ diff --git a/arch/parisc/include/uapi/asm/mman.h b/arch/parisc/include/uapi/asm/mman.h index 294d251ca7b2..ecc3ae1ca28e 100644 --- a/arch/parisc/include/uapi/asm/mman.h +++ b/arch/parisc/include/uapi/asm/mman.h @@ -31,6 +31,9 @@ #define MCL_CURRENT 1 /* lock all current mappings */ #define MCL_FUTURE 2 /* lock all future mappings */ +#define MCL_ONFAULT 4 /* lock all pages that are faulted in */ + +#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ #define MADV_NORMAL 0 /* no further special treatment */ #define MADV_RANDOM 1 /* expect random page references */ diff --git a/arch/powerpc/include/uapi/asm/mman.h b/arch/powerpc/include/uapi/asm/mman.h index 6ea26df0a73c..03c06ba7464f 100644 --- a/arch/powerpc/include/uapi/asm/mman.h +++ b/arch/powerpc/include/uapi/asm/mman.h @@ -22,6 +22,7 @@ #define MCL_CURRENT 0x2000 /* lock all currently mapped pages */ #define MCL_FUTURE 0x4000 /* lock all additions to address space */ +#define MCL_ONFAULT 0x8000 /* lock all pages that are faulted in */ #define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */ #define MAP_NONBLOCK 0x10000 /* do not block on IO */ diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 8b9502adaf79..8d8a541211d0 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -80,7 +80,7 @@ static void __init setup_node_to_cpumask_map(void) setup_nr_node_ids(); /* allocate the map */ - for (node = 0; node < nr_node_ids; node++) + for_each_node(node) alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]); /* cpumask_of_node() will now work */ diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c index ebc1f412cf49..13b9bcf5485e 100644 --- a/arch/powerpc/sysdev/fsl_pci.c +++ b/arch/powerpc/sysdev/fsl_pci.c @@ -999,7 +999,7 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs) ret = get_user(regs->nip, &inst); pagefault_enable(); } else { - ret = probe_kernel_address(regs->nip, inst); + ret = probe_kernel_address((void *)regs->nip, inst); } if (mcheck_handle_load(regs, inst)) { diff --git a/arch/sparc/include/uapi/asm/mman.h b/arch/sparc/include/uapi/asm/mman.h index 0b14df33cffa..9765896ecb2c 100644 --- a/arch/sparc/include/uapi/asm/mman.h +++ b/arch/sparc/include/uapi/asm/mman.h @@ -17,6 +17,7 @@ #define MCL_CURRENT 0x2000 /* lock all currently mapped pages */ #define MCL_FUTURE 0x4000 /* lock all additions to address space */ +#define MCL_ONFAULT 0x8000 /* lock all pages that are faulted in */ #define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */ #define MAP_NONBLOCK 0x10000 /* do not block on IO */ diff --git a/arch/tile/include/uapi/asm/mman.h b/arch/tile/include/uapi/asm/mman.h index 81b8fc348d63..63ee13faf17d 100644 --- a/arch/tile/include/uapi/asm/mman.h +++ b/arch/tile/include/uapi/asm/mman.h @@ -36,6 +36,7 @@ */ #define MCL_CURRENT 1 /* lock all current mappings */ #define MCL_FUTURE 2 /* lock all future mappings */ +#define MCL_ONFAULT 4 /* lock all pages that are faulted in */ #endif /* _ASM_TILE_MMAN_H */ diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile index 0d553e54171b..2ee62dba0373 100644 --- a/arch/x86/boot/Makefile +++ b/arch/x86/boot/Makefile @@ -9,13 +9,13 @@ # Changed by many, many contributors over the years. # +KASAN_SANITIZE := n + # If you want to preset the SVGA mode, uncomment the next line and # set SVGA_MODE to whatever number you want. # Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode. # The number is the same as you would ordinarily press at bootup. -KASAN_SANITIZE := n - SVGA_MODE := -DSVGA_MODE=NORMAL_VGA targets := vmlinux.bin setup.bin setup.elf bzImage diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index caa2c712d1e7..f17705e1332c 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -382,3 +382,4 @@ 373 i386 shutdown sys_shutdown 374 i386 userfaultfd sys_userfaultfd 375 i386 membarrier sys_membarrier +376 i386 mlock2 sys_mlock2 diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 278842fdf1f6..314a90bfc09c 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -331,6 +331,7 @@ 322 64 execveat stub_execveat 323 common userfaultfd sys_userfaultfd 324 common membarrier sys_membarrier +325 common mlock2 sys_mlock2 # # x32-specific system call numbers start at 512 to avoid cache impact diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 9ce5da27b136..d470cf219a2d 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -126,5 +126,5 @@ void __init kasan_init(void) __flush_tlb_all(); init_task.kasan_depth = 0; - pr_info("Kernel address sanitizer initialized\n"); + pr_info("KernelAddressSanitizer initialized\n"); } diff --git a/arch/xtensa/include/uapi/asm/mman.h b/arch/xtensa/include/uapi/asm/mman.h index 201aec0e0446..360944e1da52 100644 --- a/arch/xtensa/include/uapi/asm/mman.h +++ b/arch/xtensa/include/uapi/asm/mman.h @@ -74,6 +74,12 @@ */ #define MCL_CURRENT 1 /* lock all current mappings */ #define MCL_FUTURE 2 /* lock all future mappings */ +#define MCL_ONFAULT 4 /* lock all pages that are faulted in */ + +/* + * Flags for mlock + */ +#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ #define MADV_NORMAL 0 /* no further special treatment */ #define MADV_RANDOM 1 /* expect random page references */ diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index f23fd86697ea..7bf835f85bc8 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -231,7 +231,8 @@ out_unlock: if (res < 0 && fl->fl_type != F_UNLCK) { fl_type = fl->fl_type; fl->fl_type = F_UNLCK; - res = locks_lock_file_wait(filp, fl); + /* Even if this fails we want to return the remote error */ + locks_lock_file_wait(filp, fl); fl->fl_type = fl_type; } out: diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 7378169e90be..206a68b1db1a 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -2149,7 +2149,12 @@ static void wait_sb_inodes(struct super_block *sb) iput(old_inode); old_inode = inode; - filemap_fdatawait(mapping); + /* + * We keep the error status of individual mapping so that + * applications can catch the writeback error using fsync(2). + * See filemap_fdatawait_keep_errors() for details. + */ + filemap_fdatawait_keep_errors(mapping); cond_resched(); diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c index a7fdbd868474..a709d80c8ebc 100644 --- a/fs/logfs/dev_bdev.c +++ b/fs/logfs/dev_bdev.c @@ -81,7 +81,7 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index, unsigned int max_pages; int i; - max_pages = min(nr_pages, BIO_MAX_PAGES); + max_pages = min_t(size_t, nr_pages, BIO_MAX_PAGES); bio = bio_alloc(GFP_NOFS, max_pages); BUG_ON(!bio); @@ -171,7 +171,7 @@ static int do_erase(struct super_block *sb, u64 ofs, pgoff_t index, unsigned int max_pages; int i; - max_pages = min(nr_pages, BIO_MAX_PAGES); + max_pages = min_t(size_t, nr_pages, BIO_MAX_PAGES); bio = bio_alloc(GFP_NOFS, max_pages); BUG_ON(!bio); diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c index 6b6f0d472ae8..fd98e5100cab 100644 --- a/fs/notify/fdinfo.c +++ b/fs/notify/fdinfo.c @@ -83,9 +83,16 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark) inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark); inode = igrab(mark->inode); if (inode) { + /* + * IN_ALL_EVENTS represents all of the mask bits + * that we expose to userspace. There is at + * least one bit (FS_EVENT_ON_CHILD) which is + * used only internally to the kernel. + */ + u32 mask = mark->mask & IN_ALL_EVENTS; seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ", inode_mark->wd, inode->i_ino, inode->i_sb->s_dev, - mark->mask, mark->ignored_mask); + mask, mark->ignored_mask); show_mark_fhandle(m, inode); seq_putc(m, '\n'); iput(inode); diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c index 5b1e2a497e51..b8d08d0d0a4d 100644 --- a/fs/notify/inotify/inotify_user.c +++ b/fs/notify/inotify/inotify_user.c @@ -706,7 +706,19 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, int ret; unsigned flags = 0; - /* don't allow invalid bits: we don't want flags set */ + /* + * We share a lot of code with fs/dnotify. We also share + * the bit layout between inotify's IN_* and the fsnotify + * FS_*. This check ensures that only the inotify IN_* + * bits get passed in and set in watches/events. + */ + if (unlikely(mask & ~ALL_INOTIFY_BITS)) + return -EINVAL; + /* + * Require at least one valid bit set in the mask. + * Without _something_ set, we would have no events to + * watch for. + */ if (unlikely(!(mask & ALL_INOTIFY_BITS))) return -EINVAL; diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index 64b11d90eca6..7f604727f487 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -589,6 +589,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, ret = -EIO; goto bail; } + set_buffer_new(bh_result); up_write(&OCFS2_I(inode)->ip_alloc_sem); } @@ -864,6 +865,7 @@ static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb, is_overwrite = ocfs2_is_overwrite(osb, inode, offset); if (is_overwrite < 0) { mlog_errno(is_overwrite); + ret = is_overwrite; ocfs2_inode_unlock(inode, 1); goto clean_orphan; } diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c index fa15debcc02b..ddddef0021a0 100644 --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -219,7 +219,8 @@ struct o2hb_region { unsigned hr_unclean_stop:1, hr_aborted_start:1, hr_item_pinned:1, - hr_item_dropped:1; + hr_item_dropped:1, + hr_node_deleted:1; /* protected by the hr_callback_sem */ struct task_struct *hr_task; @@ -1078,7 +1079,13 @@ static int o2hb_thread(void *data) set_user_nice(current, MIN_NICE); /* Pin node */ - o2nm_depend_this_node(); + ret = o2nm_depend_this_node(); + if (ret) { + mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret); + reg->hr_node_deleted = 1; + wake_up(&o2hb_steady_queue); + return 0; + } while (!kthread_should_stop() && !reg->hr_unclean_stop && !reg->hr_aborted_start) { @@ -1787,7 +1794,8 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, spin_unlock(&o2hb_live_lock); ret = wait_event_interruptible(o2hb_steady_queue, - atomic_read(®->hr_steady_iterations) == 0); + atomic_read(®->hr_steady_iterations) == 0 || + reg->hr_node_deleted); if (ret) { atomic_set(®->hr_steady_iterations, 0); reg->hr_aborted_start = 1; @@ -1798,6 +1806,11 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, goto out3; } + if (reg->hr_node_deleted) { + ret = -EINVAL; + goto out3; + } + /* Ok, we were woken. Make sure it wasn't by drop_item() */ spin_lock(&o2hb_live_lock); hb_task = reg->hr_task; diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c index 6918f30d02cd..2ee7fe747cea 100644 --- a/fs/ocfs2/dlm/dlmdomain.c +++ b/fs/ocfs2/dlm/dlmdomain.c @@ -1866,6 +1866,7 @@ static int dlm_join_domain(struct dlm_ctxt *dlm) int status; unsigned int backoff; unsigned int total_backoff = 0; + char wq_name[O2NM_MAX_NAME_LEN]; BUG_ON(!dlm); @@ -1895,7 +1896,8 @@ static int dlm_join_domain(struct dlm_ctxt *dlm) goto bail; } - dlm->dlm_worker = create_singlethread_workqueue("dlm_wq"); + snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name); + dlm->dlm_worker = create_singlethread_workqueue(wq_name); if (!dlm->dlm_worker) { status = -ENOMEM; mlog_errno(status); diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c index 58eaa5c0d387..9e4f862d20fe 100644 --- a/fs/ocfs2/dlm/dlmrecovery.c +++ b/fs/ocfs2/dlm/dlmrecovery.c @@ -205,7 +205,7 @@ int dlm_launch_recovery_thread(struct dlm_ctxt *dlm) mlog(0, "starting dlm recovery thread...\n"); dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm, - "dlm_reco_thread"); + "dlm_reco-%s", dlm->name); if (IS_ERR(dlm->dlm_reco_thread_task)) { mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task)); dlm->dlm_reco_thread_task = NULL; diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c index 2e5e6d5fffe8..c5f6c241ecd7 100644 --- a/fs/ocfs2/dlm/dlmthread.c +++ b/fs/ocfs2/dlm/dlmthread.c @@ -493,7 +493,8 @@ int dlm_launch_thread(struct dlm_ctxt *dlm) { mlog(0, "Starting dlm_thread...\n"); - dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm_thread"); + dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm-%s", + dlm->name); if (IS_ERR(dlm->dlm_thread_task)) { mlog_errno(PTR_ERR(dlm->dlm_thread_task)); dlm->dlm_thread_task = NULL; diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 1c91103c1333..20276e340339 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -2998,7 +2998,8 @@ int ocfs2_dlm_init(struct ocfs2_super *osb) } /* launch downconvert thread */ - osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc"); + osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s", + osb->uuid_str); if (IS_ERR(osb->dc_task)) { status = PTR_ERR(osb->dc_task); osb->dc_task = NULL; diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h index ca3431ee7f24..aac8b86f312e 100644 --- a/fs/ocfs2/inode.h +++ b/fs/ocfs2/inode.h @@ -112,6 +112,8 @@ struct ocfs2_inode_info #define OCFS2_INODE_OPEN_DIRECT 0x00000020 /* Tell the inode wipe code it's not in orphan dir */ #define OCFS2_INODE_SKIP_ORPHAN_DIR 0x00000040 +/* Entry in orphan dir with 'dio-' prefix */ +#define OCFS2_INODE_DIO_ORPHAN_ENTRY 0x00000080 static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode) { diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c index ff82b28462a6..13534f4fe5b5 100644 --- a/fs/ocfs2/journal.c +++ b/fs/ocfs2/journal.c @@ -1090,7 +1090,7 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed) /* Launch the commit thread */ if (!local) { osb->commit_task = kthread_run(ocfs2_commit_thread, osb, - "ocfs2cmt"); + "ocfs2cmt-%s", osb->uuid_str); if (IS_ERR(osb->commit_task)) { status = PTR_ERR(osb->commit_task); osb->commit_task = NULL; @@ -1507,7 +1507,7 @@ void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num) goto out; osb->recovery_thread_task = kthread_run(__ocfs2_recovery_thread, osb, - "ocfs2rec"); + "ocfs2rec-%s", osb->uuid_str); if (IS_ERR(osb->recovery_thread_task)) { mlog_errno((int)PTR_ERR(osb->recovery_thread_task)); osb->recovery_thread_task = NULL; @@ -2021,6 +2021,7 @@ struct ocfs2_orphan_filldir_priv { struct dir_context ctx; struct inode *head; struct ocfs2_super *osb; + enum ocfs2_orphan_reco_type orphan_reco_type; }; static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name, @@ -2036,12 +2037,22 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name, if (name_len == 2 && !strncmp("..", name, 2)) return 0; + /* do not include dio entry in case of orphan scan */ + if ((p->orphan_reco_type == ORPHAN_NO_NEED_TRUNCATE) && + (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX, + OCFS2_DIO_ORPHAN_PREFIX_LEN))) + return 0; + /* Skip bad inodes so that recovery can continue */ iter = ocfs2_iget(p->osb, ino, OCFS2_FI_FLAG_ORPHAN_RECOVERY, 0); if (IS_ERR(iter)) return 0; + if (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX, + OCFS2_DIO_ORPHAN_PREFIX_LEN)) + OCFS2_I(iter)->ip_flags |= OCFS2_INODE_DIO_ORPHAN_ENTRY; + /* Skip inodes which are already added to recover list, since dio may * happen concurrently with unlink/rename */ if (OCFS2_I(iter)->ip_next_orphan) { @@ -2060,14 +2071,16 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name, static int ocfs2_queue_orphans(struct ocfs2_super *osb, int slot, - struct inode **head) + struct inode **head, + enum ocfs2_orphan_reco_type orphan_reco_type) { int status; struct inode *orphan_dir_inode = NULL; struct ocfs2_orphan_filldir_priv priv = { .ctx.actor = ocfs2_orphan_filldir, .osb = osb, - .head = *head + .head = *head, + .orphan_reco_type = orphan_reco_type }; orphan_dir_inode = ocfs2_get_system_file_inode(osb, @@ -2170,7 +2183,7 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb, trace_ocfs2_recover_orphans(slot); ocfs2_mark_recovering_orphan_dir(osb, slot); - ret = ocfs2_queue_orphans(osb, slot, &inode); + ret = ocfs2_queue_orphans(osb, slot, &inode, orphan_reco_type); ocfs2_clear_recovering_orphan_dir(osb, slot); /* Error here should be noted, but we want to continue with as @@ -2186,25 +2199,51 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb, iter = oi->ip_next_orphan; oi->ip_next_orphan = NULL; - mutex_lock(&inode->i_mutex); - ret = ocfs2_rw_lock(inode, 1); - if (ret < 0) { - mlog_errno(ret); - goto next; - } - /* - * We need to take and drop the inode lock to - * force read inode from disk. - */ - ret = ocfs2_inode_lock(inode, &di_bh, 1); - if (ret) { - mlog_errno(ret); - goto unlock_rw; - } + if (oi->ip_flags & OCFS2_INODE_DIO_ORPHAN_ENTRY) { + mutex_lock(&inode->i_mutex); + ret = ocfs2_rw_lock(inode, 1); + if (ret < 0) { + mlog_errno(ret); + goto unlock_mutex; + } + /* + * We need to take and drop the inode lock to + * force read inode from disk. + */ + ret = ocfs2_inode_lock(inode, &di_bh, 1); + if (ret) { + mlog_errno(ret); + goto unlock_rw; + } - di = (struct ocfs2_dinode *)di_bh->b_data; + di = (struct ocfs2_dinode *)di_bh->b_data; - if (inode->i_nlink == 0) { + if (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)) { + ret = ocfs2_truncate_file(inode, di_bh, + i_size_read(inode)); + if (ret < 0) { + if (ret != -ENOSPC) + mlog_errno(ret); + goto unlock_inode; + } + + ret = ocfs2_del_inode_from_orphan(osb, inode, + di_bh, 0, 0); + if (ret) + mlog_errno(ret); + } +unlock_inode: + ocfs2_inode_unlock(inode, 1); + brelse(di_bh); + di_bh = NULL; +unlock_rw: + ocfs2_rw_unlock(inode, 1); +unlock_mutex: + mutex_unlock(&inode->i_mutex); + + /* clear dio flag in ocfs2_inode_info */ + oi->ip_flags &= ~OCFS2_INODE_DIO_ORPHAN_ENTRY; + } else { spin_lock(&oi->ip_lock); /* Set the proper information to get us going into * ocfs2_delete_inode. */ @@ -2212,28 +2251,6 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb, spin_unlock(&oi->ip_lock); } - if ((orphan_reco_type == ORPHAN_NEED_TRUNCATE) && - (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) { - ret = ocfs2_truncate_file(inode, di_bh, - i_size_read(inode)); - if (ret < 0) { - if (ret != -ENOSPC) - mlog_errno(ret); - goto unlock_inode; - } - - ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0); - if (ret) - mlog_errno(ret); - } /* else if ORPHAN_NO_NEED_TRUNCATE, do nothing */ -unlock_inode: - ocfs2_inode_unlock(inode, 1); - brelse(di_bh); - di_bh = NULL; -unlock_rw: - ocfs2_rw_unlock(inode, 1); -next: - mutex_unlock(&inode->i_mutex); iput(inode); inode = iter; } diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c index b7dfac226b1e..3b48ac25d8a7 100644 --- a/fs/ocfs2/namei.c +++ b/fs/ocfs2/namei.c @@ -106,8 +106,6 @@ static int ocfs2_double_lock(struct ocfs2_super *osb, static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2); /* An orphan dir name is an 8 byte value, printed as a hex string */ #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64))) -#define OCFS2_DIO_ORPHAN_PREFIX "dio-" -#define OCFS2_DIO_ORPHAN_PREFIX_LEN 4 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) @@ -657,9 +655,18 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb, return status; } - return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh, + status = __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh, parent_fe_bh, handle, inode_ac, fe_blkno, suballoc_loc, suballoc_bit); + if (status < 0) { + u64 bg_blkno = ocfs2_which_suballoc_group(fe_blkno, suballoc_bit); + int tmp = ocfs2_free_suballoc_bits(handle, inode_ac->ac_inode, + inode_ac->ac_bh, suballoc_bit, bg_blkno, 1); + if (tmp) + mlog_errno(tmp); + } + + return status; } static int ocfs2_mkdir(struct inode *dir, diff --git a/fs/ocfs2/namei.h b/fs/ocfs2/namei.h index e173329eb830..1155918d6784 100644 --- a/fs/ocfs2/namei.h +++ b/fs/ocfs2/namei.h @@ -26,6 +26,9 @@ #ifndef OCFS2_NAMEI_H #define OCFS2_NAMEI_H +#define OCFS2_DIO_ORPHAN_PREFIX "dio-" +#define OCFS2_DIO_ORPHAN_PREFIX_LEN 4 + extern const struct inode_operations ocfs2_dir_iops; struct dentry *ocfs2_get_parent(struct dentry *child); diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c index e5d57cd32505..252119860e6c 100644 --- a/fs/ocfs2/refcounttree.c +++ b/fs/ocfs2/refcounttree.c @@ -2920,16 +2920,13 @@ int ocfs2_duplicate_clusters_by_page(handle_t *handle, u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); struct page *page; pgoff_t page_index; - unsigned int from, to, readahead_pages; + unsigned int from, to; loff_t offset, end, map_end; struct address_space *mapping = inode->i_mapping; trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster, new_cluster, new_len); - readahead_pages = - (ocfs2_cow_contig_clusters(sb) << - OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT; offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits); /* diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c index d83d2602cf2b..fc6d25f6d444 100644 --- a/fs/ocfs2/suballoc.c +++ b/fs/ocfs2/suballoc.c @@ -1920,7 +1920,10 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac, status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits, res, &bits_left); if (!status) { - hint = ocfs2_group_from_res(res); + if (ocfs2_is_cluster_bitmap(ac->ac_inode)) + hint = res->sr_bg_blkno; + else + hint = ocfs2_group_from_res(res); goto set_hint; } if (status < 0 && status != -ENOSPC) { diff --git a/fs/proc/base.c b/fs/proc/base.c index 29595af32866..bd3e9e68125b 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1032,6 +1032,16 @@ static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, return simple_read_from_buffer(buf, count, ppos, buffer, len); } +/* + * /proc/pid/oom_adj exists solely for backwards compatibility with previous + * kernels. The effective policy is defined by oom_score_adj, which has a + * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. + * Values written to oom_adj are simply mapped linearly to oom_score_adj. + * Processes that become oom disabled via oom_adj will still be oom disabled + * with this implementation. + * + * oom_adj cannot be removed since existing userspace binaries use it. + */ static ssize_t oom_adj_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index b029d426c558..187b3b5f242e 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -70,6 +70,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm) ptes >> 10, pmds >> 10, swap << (PAGE_SHIFT-10)); + hugetlb_report_usage(m, mm); } unsigned long task_vsize(struct mm_struct *mm) @@ -446,6 +447,8 @@ struct mem_size_stats { unsigned long anonymous; unsigned long anonymous_thp; unsigned long swap; + unsigned long shared_hugetlb; + unsigned long private_hugetlb; u64 pss; u64 swap_pss; }; @@ -625,12 +628,44 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) seq_putc(m, '\n'); } +#ifdef CONFIG_HUGETLB_PAGE +static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, + unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + struct mem_size_stats *mss = walk->private; + struct vm_area_struct *vma = walk->vma; + struct page *page = NULL; + + if (pte_present(*pte)) { + page = vm_normal_page(vma, addr, *pte); + } else if (is_swap_pte(*pte)) { + swp_entry_t swpent = pte_to_swp_entry(*pte); + + if (is_migration_entry(swpent)) + page = migration_entry_to_page(swpent); + } + if (page) { + int mapcount = page_mapcount(page); + + if (mapcount >= 2) + mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); + else + mss->private_hugetlb += huge_page_size(hstate_vma(vma)); + } + return 0; +} +#endif /* HUGETLB_PAGE */ + static int show_smap(struct seq_file *m, void *v, int is_pid) { struct vm_area_struct *vma = v; struct mem_size_stats mss; struct mm_walk smaps_walk = { .pmd_entry = smaps_pte_range, +#ifdef CONFIG_HUGETLB_PAGE + .hugetlb_entry = smaps_hugetlb_range, +#endif .mm = vma->vm_mm, .private = &mss, }; @@ -652,6 +687,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid) "Referenced: %8lu kB\n" "Anonymous: %8lu kB\n" "AnonHugePages: %8lu kB\n" + "Shared_Hugetlb: %8lu kB\n" + "Private_Hugetlb: %7lu kB\n" "Swap: %8lu kB\n" "SwapPss: %8lu kB\n" "KernelPageSize: %8lu kB\n" @@ -667,6 +704,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid) mss.referenced >> 10, mss.anonymous >> 10, mss.anonymous_thp >> 10, + mss.shared_hugetlb >> 10, + mss.private_hugetlb >> 10, mss.swap >> 10, (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)), vma_kernel_pagesize(vma) >> 10, @@ -753,19 +792,27 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma, pte_t ptent = *pte; if (pte_present(ptent)) { + ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); ptent = pte_wrprotect(ptent); ptent = pte_clear_soft_dirty(ptent); + ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); } else if (is_swap_pte(ptent)) { ptent = pte_swp_clear_soft_dirty(ptent); + set_pte_at(vma->vm_mm, addr, pte, ptent); } - - set_pte_at(vma->vm_mm, addr, pte, ptent); } +#else +static inline void clear_soft_dirty(struct vm_area_struct *vma, + unsigned long addr, pte_t *pte) +{ +} +#endif +#if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmdp) { - pmd_t pmd = *pmdp; + pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp); pmd = pmd_wrprotect(pmd); pmd = pmd_clear_soft_dirty(pmd); @@ -775,14 +822,7 @@ static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, set_pmd_at(vma->vm_mm, addr, pmdp, pmd); } - #else - -static inline void clear_soft_dirty(struct vm_area_struct *vma, - unsigned long addr, pte_t *pte) -{ -} - static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmdp) { diff --git a/fs/sync.c b/fs/sync.c index fbc98ee62044..4ec430ae2b0d 100644 --- a/fs/sync.c +++ b/fs/sync.c @@ -86,7 +86,12 @@ static void fdatawrite_one_bdev(struct block_device *bdev, void *arg) static void fdatawait_one_bdev(struct block_device *bdev, void *arg) { - filemap_fdatawait(bdev->bd_inode->i_mapping); + /* + * We keep the error status of individual mapping so that + * applications can catch the writeback error using fsync(2). + * See filemap_fdatawait_keep_errors() for details. + */ + filemap_fdatawait_keep_errors(bdev->bd_inode->i_mapping); } /* diff --git a/include/linux/compaction.h b/include/linux/compaction.h index aa8f61cf3a19..4cd4ddf64cc7 100644 --- a/include/linux/compaction.h +++ b/include/linux/compaction.h @@ -15,7 +15,8 @@ /* For more detailed tracepoint output */ #define COMPACT_NO_SUITABLE_PAGE 5 #define COMPACT_NOT_SUITABLE_ZONE 6 -/* When adding new state, please change compaction_status_string, too */ +#define COMPACT_CONTENDED 7 +/* When adding new states, please adjust include/trace/events/compaction.h */ /* Used to signal whether compaction detected need_sched() or lock contention */ /* No contention detected */ diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 8efb40e61d6e..0e3110a0b771 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -210,6 +210,23 @@ #define __visible __attribute__((externally_visible)) #endif + +#if GCC_VERSION >= 40900 && !defined(__CHECKER__) +/* + * __assume_aligned(n, k): Tell the optimizer that the returned + * pointer can be assumed to be k modulo n. The second argument is + * optional (default 0), so we use a variadic macro to make the + * shorthand. + * + * Beware: Do not apply this to functions which may return + * ERR_PTRs. Also, it is probably unwise to apply it to functions + * returning extra information in the low bits (but in that case the + * compiler should see some alignment anyway, when the return value is + * massaged by 'flags = ptr & 3; ptr &= ~3;'). + */ +#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__))) +#endif + /* * GCC 'asm goto' miscompiles certain code sequences: * diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 52a459ff75f4..4dac1036594f 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -417,6 +417,14 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s #define __visible #endif +/* + * Assume alignment of return value. + */ +#ifndef __assume_aligned +#define __assume_aligned(a, ...) +#endif + + /* Are two types/vars the same type (ignoring qualifiers)? */ #ifndef __same_type # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index 1b357997cac5..5a1311942358 100644 --- a/include/linux/cpuset.h +++ b/include/linux/cpuset.h @@ -93,7 +93,7 @@ extern int current_cpuset_is_being_rebound(void); extern void rebuild_sched_domains(void); -extern void cpuset_print_task_mems_allowed(struct task_struct *p); +extern void cpuset_print_current_mems_allowed(void); /* * read_mems_allowed_begin is required when making decisions involving @@ -219,7 +219,7 @@ static inline void rebuild_sched_domains(void) partition_sched_domains(1, NULL, NULL); } -static inline void cpuset_print_task_mems_allowed(struct task_struct *p) +static inline void cpuset_print_current_mems_allowed(void) { } diff --git a/include/linux/fs.h b/include/linux/fs.h index 49749688156d..9a1cb8c605e0 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2409,6 +2409,7 @@ extern int write_inode_now(struct inode *, int); extern int filemap_fdatawrite(struct address_space *); extern int filemap_flush(struct address_space *); extern int filemap_fdatawait(struct address_space *); +extern void filemap_fdatawait_keep_errors(struct address_space *); extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, loff_t lend); extern int filemap_write_and_wait(struct address_space *mapping); diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 5e35379f58a5..685c262e0be8 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -483,6 +483,17 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h, #define hugepages_supported() (HPAGE_SHIFT != 0) #endif +void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm); + +static inline void hugetlb_count_add(long l, struct mm_struct *mm) +{ + atomic_long_add(l, &mm->hugetlb_usage); +} + +static inline void hugetlb_count_sub(long l, struct mm_struct *mm) +{ + atomic_long_sub(l, &mm->hugetlb_usage); +} #else /* CONFIG_HUGETLB_PAGE */ struct hstate {}; #define alloc_huge_page(v, a, r) NULL @@ -519,6 +530,14 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h, { return &mm->page_table_lock; } + +static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m) +{ +} + +static inline void hugetlb_count_sub(long l, struct mm_struct *mm) +{ +} #endif /* CONFIG_HUGETLB_PAGE */ static inline spinlock_t *huge_pte_lock(struct hstate *h, diff --git a/include/linux/memblock.h b/include/linux/memblock.h index c518eb589260..24daf8fc4d7c 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -89,10 +89,6 @@ int memblock_add_range(struct memblock_type *type, phys_addr_t base, phys_addr_t size, int nid, unsigned long flags); -int memblock_remove_range(struct memblock_type *type, - phys_addr_t base, - phys_addr_t size); - void __next_mem_range(u64 *idx, int nid, ulong flags, struct memblock_type *type_a, struct memblock_type *type_b, phys_addr_t *out_start, diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 27251ed428f7..cd0e2413c358 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -301,8 +301,7 @@ void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg); void mem_cgroup_uncharge(struct page *page); void mem_cgroup_uncharge_list(struct list_head *page_list); -void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, - bool lrucare); +void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage); struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *); struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *); @@ -384,7 +383,7 @@ unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru) return mz->lru_size[lru]; } -static inline int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) +static inline bool mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) { unsigned long inactive_ratio; unsigned long inactive; @@ -403,24 +402,26 @@ static inline int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) return inactive * inactive_ratio < active; } +void mem_cgroup_handle_over_high(void); + void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p); static inline void mem_cgroup_oom_enable(void) { - WARN_ON(current->memcg_oom.may_oom); - current->memcg_oom.may_oom = 1; + WARN_ON(current->memcg_may_oom); + current->memcg_may_oom = 1; } static inline void mem_cgroup_oom_disable(void) { - WARN_ON(!current->memcg_oom.may_oom); - current->memcg_oom.may_oom = 0; + WARN_ON(!current->memcg_may_oom); + current->memcg_may_oom = 0; } static inline bool task_in_memcg_oom(struct task_struct *p) { - return p->memcg_oom.memcg; + return p->memcg_in_oom; } bool mem_cgroup_oom_synchronize(bool wait); @@ -537,9 +538,7 @@ static inline void mem_cgroup_uncharge_list(struct list_head *page_list) { } -static inline void mem_cgroup_migrate(struct page *oldpage, - struct page *newpage, - bool lrucare) +static inline void mem_cgroup_replace_page(struct page *old, struct page *new) { } @@ -585,10 +584,10 @@ static inline bool mem_cgroup_disabled(void) return true; } -static inline int +static inline bool mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec) { - return 1; + return true; } static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec) @@ -622,6 +621,10 @@ static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg) { } +static inline void mem_cgroup_handle_over_high(void) +{ +} + static inline void mem_cgroup_oom_enable(void) { } @@ -748,11 +751,10 @@ static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) * conditions, but because they are pretty simple, they are expected to be * fast. */ -bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, - int order); -void __memcg_kmem_commit_charge(struct page *page, - struct mem_cgroup *memcg, int order); -void __memcg_kmem_uncharge_pages(struct page *page, int order); +int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, + struct mem_cgroup *memcg); +int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order); +void __memcg_kmem_uncharge(struct page *page, int order); /* * helper for acessing a memcg's index. It will be used as an index in the @@ -767,77 +769,42 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg) struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep); void __memcg_kmem_put_cache(struct kmem_cache *cachep); -struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr); - -int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, - unsigned long nr_pages); -void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages); - -/** - * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed. - * @gfp: the gfp allocation flags. - * @memcg: a pointer to the memcg this was charged against. - * @order: allocation order. - * - * returns true if the memcg where the current task belongs can hold this - * allocation. - * - * We return true automatically if this allocation is not to be accounted to - * any memcg. - */ -static inline bool -memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) +static inline bool __memcg_kmem_bypass(gfp_t gfp) { if (!memcg_kmem_enabled()) return true; - if (gfp & __GFP_NOACCOUNT) return true; - /* - * __GFP_NOFAIL allocations will move on even if charging is not - * possible. Therefore we don't even try, and have this allocation - * unaccounted. We could in theory charge it forcibly, but we hope - * those allocations are rare, and won't be worth the trouble. - */ - if (gfp & __GFP_NOFAIL) - return true; if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) return true; - - /* If the test is dying, just let it go. */ - if (unlikely(fatal_signal_pending(current))) - return true; - - return __memcg_kmem_newpage_charge(gfp, memcg, order); + return false; } /** - * memcg_kmem_uncharge_pages: uncharge pages from memcg - * @page: pointer to struct page being freed - * @order: allocation order. + * memcg_kmem_charge: charge a kmem page + * @page: page to charge + * @gfp: reclaim mode + * @order: allocation order + * + * Returns 0 on success, an error code on failure. */ -static inline void -memcg_kmem_uncharge_pages(struct page *page, int order) +static __always_inline int memcg_kmem_charge(struct page *page, + gfp_t gfp, int order) { - if (memcg_kmem_enabled()) - __memcg_kmem_uncharge_pages(page, order); + if (__memcg_kmem_bypass(gfp)) + return 0; + return __memcg_kmem_charge(page, gfp, order); } /** - * memcg_kmem_commit_charge: embeds correct memcg in a page - * @page: pointer to struct page recently allocated - * @memcg: the memcg structure we charged against - * @order: allocation order. - * - * Needs to be called after memcg_kmem_newpage_charge, regardless of success or - * failure of the allocation. if @page is NULL, this function will revert the - * charges. Otherwise, it will commit @page to @memcg. + * memcg_kmem_uncharge: uncharge a kmem page + * @page: page to uncharge + * @order: allocation order */ -static inline void -memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) +static __always_inline void memcg_kmem_uncharge(struct page *page, int order) { - if (memcg_kmem_enabled() && memcg) - __memcg_kmem_commit_charge(page, memcg, order); + if (memcg_kmem_enabled()) + __memcg_kmem_uncharge(page, order); } /** @@ -850,17 +817,8 @@ memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) static __always_inline struct kmem_cache * memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) { - if (!memcg_kmem_enabled()) - return cachep; - if (gfp & __GFP_NOACCOUNT) - return cachep; - if (gfp & __GFP_NOFAIL) - return cachep; - if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD)) + if (__memcg_kmem_bypass(gfp)) return cachep; - if (unlikely(fatal_signal_pending(current))) - return cachep; - return __memcg_kmem_get_cache(cachep); } @@ -869,13 +827,6 @@ static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep) if (memcg_kmem_enabled()) __memcg_kmem_put_cache(cachep); } - -static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr) -{ - if (!memcg_kmem_enabled()) - return NULL; - return __mem_cgroup_from_kmem(ptr); -} #else #define for_each_memcg_cache_index(_idx) \ for (; NULL; ) @@ -890,18 +841,12 @@ static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg) return false; } -static inline bool -memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order) -{ - return true; -} - -static inline void memcg_kmem_uncharge_pages(struct page *page, int order) +static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) { + return 0; } -static inline void -memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order) +static inline void memcg_kmem_uncharge(struct page *page, int order) { } @@ -927,11 +872,5 @@ memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) static inline void memcg_kmem_put_cache(struct kmem_cache *cachep) { } - -static inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr) -{ - return NULL; -} #endif /* CONFIG_MEMCG_KMEM */ #endif /* _LINUX_MEMCONTROL_H */ - diff --git a/include/linux/mm.h b/include/linux/mm.h index 80001de019ba..906c46a05707 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -139,6 +139,7 @@ extern unsigned int kobjsize(const void *objp); #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ +#define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ @@ -202,6 +203,9 @@ extern unsigned int kobjsize(const void *objp); /* This mask defines which mm->def_flags a process can inherit its parent */ #define VM_INIT_DEF_MASK VM_NOHUGEPAGE +/* This mask is used to clear all the VMA flags used by mlock */ +#define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) + /* * mapping from the currently active vm_flags protection bits (the * low four bits) to a page protection mask.. @@ -1606,8 +1610,10 @@ static inline void pgtable_init(void) static inline bool pgtable_page_ctor(struct page *page) { + if (!ptlock_init(page)) + return false; inc_zone_page_state(page, NR_PAGETABLE); - return ptlock_init(page); + return true; } static inline void pgtable_page_dtor(struct page *page) @@ -2036,8 +2042,6 @@ void page_cache_async_readahead(struct address_space *mapping, pgoff_t offset, unsigned long size); -unsigned long max_sane_readahead(unsigned long nr); - /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ extern int expand_stack(struct vm_area_struct *vma, unsigned long address); @@ -2137,6 +2141,7 @@ static inline struct page *follow_page(struct vm_area_struct *vma, #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ +#define FOLL_MLOCK 0x1000 /* lock present pages */ typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, void *data); diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 3d6baa7d4534..0a85da25a822 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -486,6 +486,9 @@ struct mm_struct { /* address of the bounds directory */ void __user *bd_addr; #endif +#ifdef CONFIG_HUGETLB_PAGE + atomic_long_t hugetlb_usage; +#endif }; static inline void mm_init_cpumask(struct mm_struct *mm) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index d94347737292..2d7e660cdefe 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -823,8 +823,7 @@ enum memmap_context { MEMMAP_HOTPLUG, }; extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn, - unsigned long size, - enum memmap_context context); + unsigned long size); extern void lruvec_init(struct lruvec *lruvec); diff --git a/include/linux/nmi.h b/include/linux/nmi.h index 78488e099ce7..7ec5b86735f3 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -73,6 +73,7 @@ extern int watchdog_user_enabled; extern int watchdog_thresh; extern unsigned long *watchdog_cpumask_bits; extern int sysctl_softlockup_all_cpu_backtrace; +extern int sysctl_hardlockup_all_cpu_backtrace; struct ctl_table; extern int proc_watchdog(struct ctl_table *, int , void __user *, size_t *, loff_t *); diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 416509e26d6d..a525e5067484 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -256,7 +256,7 @@ PAGEFLAG(Readahead, reclaim) TESTCLEARFLAG(Readahead, reclaim) * Must use a macro here due to header dependency issues. page_zone() is not * available at this point. */ -#define PageHighMem(__p) is_highmem(page_zone(__p)) +#define PageHighMem(__p) is_highmem_idx(page_zonenum(__p)) #else PAGEFLAG_FALSE(HighMem) #endif diff --git a/include/linux/page_counter.h b/include/linux/page_counter.h index 17fa4f8de3a6..7e62920a3a94 100644 --- a/include/linux/page_counter.h +++ b/include/linux/page_counter.h @@ -36,9 +36,9 @@ static inline unsigned long page_counter_read(struct page_counter *counter) void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages); void page_counter_charge(struct page_counter *counter, unsigned long nr_pages); -int page_counter_try_charge(struct page_counter *counter, - unsigned long nr_pages, - struct page_counter **fail); +bool page_counter_try_charge(struct page_counter *counter, + unsigned long nr_pages, + struct page_counter **fail); void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages); int page_counter_limit(struct page_counter *counter, unsigned long limit); int page_counter_memparse(const char *buf, const char *max, diff --git a/include/linux/sched.h b/include/linux/sched.h index 4effb1025fbb..eeb5066a44fb 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -384,6 +384,7 @@ extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos); extern unsigned int softlockup_panic; +extern unsigned int hardlockup_panic; void lockup_detector_init(void); #else static inline void touch_softlockup_watchdog(void) @@ -1460,7 +1461,9 @@ struct task_struct { unsigned sched_reset_on_fork:1; unsigned sched_contributes_to_load:1; unsigned sched_migrated:1; - +#ifdef CONFIG_MEMCG + unsigned memcg_may_oom:1; +#endif #ifdef CONFIG_MEMCG_KMEM unsigned memcg_kmem_skip_account:1; #endif @@ -1791,12 +1794,12 @@ struct task_struct { unsigned long trace_recursion; #endif /* CONFIG_TRACING */ #ifdef CONFIG_MEMCG - struct memcg_oom_info { - struct mem_cgroup *memcg; - gfp_t gfp_mask; - int order; - unsigned int may_oom:1; - } memcg_oom; + struct mem_cgroup *memcg_in_oom; + gfp_t memcg_oom_gfp_mask; + int memcg_oom_order; + + /* number of pages to reclaim on returning to userland */ + unsigned int memcg_nr_pages_over_high; #endif #ifdef CONFIG_UPROBES struct uprobe_task *utask; diff --git a/include/linux/slab.h b/include/linux/slab.h index 7e37d448ed91..7c82e3b307a3 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -111,7 +111,7 @@ struct mem_cgroup; * struct kmem_cache related prototypes */ void __init kmem_cache_init(void); -int slab_is_available(void); +bool slab_is_available(void); struct kmem_cache *kmem_cache_create(const char *, size_t, size_t, unsigned long, diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index a460e2ef2843..a156b82dd14c 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -887,4 +887,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename, asmlinkage long sys_membarrier(int cmd, int flags); +asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags); + #endif diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index 84d497297c5f..26c152122a42 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -50,6 +50,7 @@ #include <linux/ptrace.h> #include <linux/security.h> #include <linux/task_work.h> +#include <linux/memcontrol.h> struct linux_binprm; /* @@ -188,6 +189,8 @@ static inline void tracehook_notify_resume(struct pt_regs *regs) smp_mb__after_atomic(); if (unlikely(current->task_works)) task_work_run(); + + mem_cgroup_handle_over_high(); } #endif /* <linux/tracehook.h> */ diff --git a/include/linux/types.h b/include/linux/types.h index c314989d9158..70d8500bddf1 100644 --- a/include/linux/types.h +++ b/include/linux/types.h @@ -205,11 +205,25 @@ struct ustat { * struct callback_head - callback structure for use with RCU and task_work * @next: next update requests in a list * @func: actual update function to call after the grace period. + * + * The struct is aligned to size of pointer. On most architectures it happens + * naturally due ABI requirements, but some architectures (like CRIS) have + * weird ABI and we need to ask it explicitly. + * + * The alignment is required to guarantee that bits 0 and 1 of @next will be + * clear under normal conditions -- as long as we use call_rcu(), + * call_rcu_bh(), call_rcu_sched(), or call_srcu() to queue callback. + * + * This guarantee is important for few reasons: + * - future call_rcu_lazy() will make use of lower bits in the pointer; + * - the structure shares storage spacer in struct page with @compound_head, + * which encode PageTail() in bit 0. The guarantee is needed to avoid + * false-positive PageTail(). */ struct callback_head { struct callback_head *next; void (*func)(struct callback_head *head); -}; +} __attribute__((aligned(sizeof(void *)))); #define rcu_head callback_head typedef void (*rcu_callback_t)(struct rcu_head *head); diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index d6f2c2c5b043..558129af828a 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -75,36 +75,6 @@ static inline unsigned long __copy_from_user_nocache(void *to, #endif /* ARCH_HAS_NOCACHE_UACCESS */ -/** - * probe_kernel_address(): safely attempt to read from a location - * @addr: address to read from - its type is type typeof(retval)* - * @retval: read into this variable - * - * Safely read from address @addr into variable @revtal. If a kernel fault - * happens, handle that and return -EFAULT. - * We ensure that the __get_user() is executed in atomic context so that - * do_page_fault() doesn't attempt to take mmap_sem. This makes - * probe_kernel_address() suitable for use within regions where the caller - * already holds mmap_sem, or other locks which nest inside mmap_sem. - * This must be a macro because __get_user() needs to know the types of the - * args. - * - * We don't include enough header files to be able to do the set_fs(). We - * require that the probe_kernel_address() caller will do that. - */ -#define probe_kernel_address(addr, retval) \ - ({ \ - long ret; \ - mm_segment_t old_fs = get_fs(); \ - \ - set_fs(KERNEL_DS); \ - pagefault_disable(); \ - ret = __copy_from_user_inatomic(&(retval), (__force typeof(retval) __user *)(addr), sizeof(retval)); \ - pagefault_enable(); \ - set_fs(old_fs); \ - ret; \ - }) - /* * probe_kernel_read(): safely attempt to read from a location * @dst: pointer to the buffer that shall take the data @@ -131,4 +101,14 @@ extern long notrace __probe_kernel_write(void *dst, const void *src, size_t size extern long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count); +/** + * probe_kernel_address(): safely attempt to read from a location + * @addr: address to read from + * @retval: read into this variable + * + * Returns 0 on success, or -EFAULT. + */ +#define probe_kernel_address(addr, retval) \ + probe_kernel_read(&retval, addr, sizeof(retval)) + #endif /* __LINUX_UACCESS_H__ */ diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index 9246d32dc973..e623d392db0c 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -14,12 +14,12 @@ #endif #ifdef CONFIG_HIGHMEM -#define HIGHMEM_ZONE(xx) , xx##_HIGH +#define HIGHMEM_ZONE(xx) xx##_HIGH, #else #define HIGHMEM_ZONE(xx) #endif -#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE +#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL, HIGHMEM_ZONE(xx) xx##_MOVABLE enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, FOR_ALL_ZONES(PGALLOC), diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index 82e7db7f7100..5dbc8b0ee567 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -161,30 +161,8 @@ static inline unsigned long zone_page_state_snapshot(struct zone *zone, } #ifdef CONFIG_NUMA -/* - * Determine the per node value of a stat item. This function - * is called frequently in a NUMA machine, so try to be as - * frugal as possible. - */ -static inline unsigned long node_page_state(int node, - enum zone_stat_item item) -{ - struct zone *zones = NODE_DATA(node)->node_zones; - - return -#ifdef CONFIG_ZONE_DMA - zone_page_state(&zones[ZONE_DMA], item) + -#endif -#ifdef CONFIG_ZONE_DMA32 - zone_page_state(&zones[ZONE_DMA32], item) + -#endif -#ifdef CONFIG_HIGHMEM - zone_page_state(&zones[ZONE_HIGHMEM], item) + -#endif - zone_page_state(&zones[ZONE_NORMAL], item) + - zone_page_state(&zones[ZONE_MOVABLE], item); -} +extern unsigned long node_page_state(int node, enum zone_stat_item item); extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp); #else @@ -269,7 +247,6 @@ static inline void __dec_zone_page_state(struct page *page, #define set_pgdat_percpu_threshold(pgdat, callback) { } -static inline void refresh_cpu_vm_stats(int cpu) { } static inline void refresh_zone_stat_thresholds(void) { } static inline void cpu_vm_stats_fold(int cpu) { } diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h index 9a6a3fe0fb51..c92d1e1cbad9 100644 --- a/include/trace/events/compaction.h +++ b/include/trace/events/compaction.h @@ -9,6 +9,62 @@ #include <linux/tracepoint.h> #include <trace/events/gfpflags.h> +#define COMPACTION_STATUS \ + EM( COMPACT_DEFERRED, "deferred") \ + EM( COMPACT_SKIPPED, "skipped") \ + EM( COMPACT_CONTINUE, "continue") \ + EM( COMPACT_PARTIAL, "partial") \ + EM( COMPACT_COMPLETE, "complete") \ + EM( COMPACT_NO_SUITABLE_PAGE, "no_suitable_page") \ + EM( COMPACT_NOT_SUITABLE_ZONE, "not_suitable_zone") \ + EMe(COMPACT_CONTENDED, "contended") + +#ifdef CONFIG_ZONE_DMA +#define IFDEF_ZONE_DMA(X) X +#else +#define IFDEF_ZONE_DMA(X) +#endif + +#ifdef CONFIG_ZONE_DMA32 +#define IFDEF_ZONE_DMA32(X) X +#else +#define IFDEF_ZONE_DMA32(X) +#endif + +#ifdef CONFIG_HIGHMEM +#define IFDEF_ZONE_HIGHMEM(X) X +#else +#define IFDEF_ZONE_HIGHMEM(X) +#endif + +#define ZONE_TYPE \ + IFDEF_ZONE_DMA( EM (ZONE_DMA, "DMA")) \ + IFDEF_ZONE_DMA32( EM (ZONE_DMA32, "DMA32")) \ + EM (ZONE_NORMAL, "Normal") \ + IFDEF_ZONE_HIGHMEM( EM (ZONE_HIGHMEM,"HighMem")) \ + EMe(ZONE_MOVABLE,"Movable") + +/* + * First define the enums in the above macros to be exported to userspace + * via TRACE_DEFINE_ENUM(). + */ +#undef EM +#undef EMe +#define EM(a, b) TRACE_DEFINE_ENUM(a); +#define EMe(a, b) TRACE_DEFINE_ENUM(a); + +COMPACTION_STATUS +ZONE_TYPE + +/* + * Now redefine the EM() and EMe() macros to map the enums to the strings + * that will be printed in the output. + */ +#undef EM +#undef EMe +#define EM(a, b) {a, b}, +#define EMe(a, b) {a, b} + DECLARE_EVENT_CLASS(mm_compaction_isolate_template, TP_PROTO( @@ -161,7 +217,7 @@ TRACE_EVENT(mm_compaction_end, __entry->free_pfn, __entry->zone_end, __entry->sync ? "sync" : "async", - compaction_status_string[__entry->status]) + __print_symbolic(__entry->status, COMPACTION_STATUS)) ); TRACE_EVENT(mm_compaction_try_to_compact_pages, @@ -201,23 +257,23 @@ DECLARE_EVENT_CLASS(mm_compaction_suitable_template, TP_STRUCT__entry( __field(int, nid) - __field(char *, name) + __field(enum zone_type, idx) __field(int, order) __field(int, ret) ), TP_fast_assign( __entry->nid = zone_to_nid(zone); - __entry->name = (char *)zone->name; + __entry->idx = zone_idx(zone); __entry->order = order; __entry->ret = ret; ), TP_printk("node=%d zone=%-8s order=%d ret=%s", __entry->nid, - __entry->name, + __print_symbolic(__entry->idx, ZONE_TYPE), __entry->order, - compaction_status_string[__entry->ret]) + __print_symbolic(__entry->ret, COMPACTION_STATUS)) ); DEFINE_EVENT(mm_compaction_suitable_template, mm_compaction_finished, @@ -247,7 +303,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template, TP_STRUCT__entry( __field(int, nid) - __field(char *, name) + __field(enum zone_type, idx) __field(int, order) __field(unsigned int, considered) __field(unsigned int, defer_shift) @@ -256,7 +312,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template, TP_fast_assign( __entry->nid = zone_to_nid(zone); - __entry->name = (char *)zone->name; + __entry->idx = zone_idx(zone); __entry->order = order; __entry->considered = zone->compact_considered; __entry->defer_shift = zone->compact_defer_shift; @@ -265,7 +321,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template, TP_printk("node=%d zone=%-8s order=%d order_failed=%d consider=%u limit=%lu", __entry->nid, - __entry->name, + __print_symbolic(__entry->idx, ZONE_TYPE), __entry->order, __entry->order_failed, __entry->considered, diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index ddc3b36f1046..a74dd84bbb6d 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -25,6 +25,11 @@ # define MAP_UNINITIALIZED 0x0 /* Don't support this flag */ #endif +/* + * Flags for mlock + */ +#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ + #define MS_ASYNC 1 /* sync memory asynchronously */ #define MS_INVALIDATE 2 /* invalidate the caches */ #define MS_SYNC 4 /* synchronous memory sync */ diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h index e9fe6fd2a074..7162cd4cca73 100644 --- a/include/uapi/asm-generic/mman.h +++ b/include/uapi/asm-generic/mman.h @@ -17,5 +17,6 @@ #define MCL_CURRENT 1 /* lock all current mappings */ #define MCL_FUTURE 2 /* lock all future mappings */ +#define MCL_ONFAULT 4 /* lock all pages that are faulted in */ #endif /* __ASM_GENERIC_MMAN_H */ diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index ee124009e12a..1324b0292ec2 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -713,9 +713,11 @@ __SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat) __SYSCALL(__NR_userfaultfd, sys_userfaultfd) #define __NR_membarrier 283 __SYSCALL(__NR_membarrier, sys_membarrier) +#define __NR_mlock2 284 +__SYSCALL(__NR_mlock2, sys_mlock2) #undef __NR_syscalls -#define __NR_syscalls 284 +#define __NR_syscalls 285 /* * All syscalls below here should go away really, diff --git a/kernel/cpuset.c b/kernel/cpuset.c index d7ccb87a6714..10ae73611d80 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -2598,22 +2598,22 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, } /** - * cpuset_print_task_mems_allowed - prints task's cpuset and mems_allowed - * @tsk: pointer to task_struct of some task. + * cpuset_print_current_mems_allowed - prints current's cpuset and mems_allowed * - * Description: Prints @task's name, cpuset name, and cached copy of its + * Description: Prints current's name, cpuset name, and cached copy of its * mems_allowed to the kernel log. */ -void cpuset_print_task_mems_allowed(struct task_struct *tsk) +void cpuset_print_current_mems_allowed(void) { struct cgroup *cgrp; rcu_read_lock(); - cgrp = task_cs(tsk)->css.cgroup; - pr_info("%s cpuset=", tsk->comm); + cgrp = task_cs(current)->css.cgroup; + pr_info("%s cpuset=", current->comm); pr_cont_cgroup_name(cgrp); - pr_cont(" mems_allowed=%*pbl\n", nodemask_pr_args(&tsk->mems_allowed)); + pr_cont(" mems_allowed=%*pbl\n", + nodemask_pr_args(¤t->mems_allowed)); rcu_read_unlock(); } diff --git a/kernel/fork.c b/kernel/fork.c index 825ecc32454d..f97f2c449f5c 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -455,7 +455,8 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) tmp->vm_mm = mm; if (anon_vma_fork(tmp, mpnt)) goto fail_nomem_anon_vma_fork; - tmp->vm_flags &= ~(VM_LOCKED|VM_UFFD_MISSING|VM_UFFD_WP); + tmp->vm_flags &= + ~(VM_LOCKED|VM_LOCKONFAULT|VM_UFFD_MISSING|VM_UFFD_WP); tmp->vm_next = tmp->vm_prev = NULL; tmp->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX; file = tmp->vm_file; diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index a02decf15583..0623787ec67a 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -194,6 +194,7 @@ cond_syscall(sys_mlock); cond_syscall(sys_munlock); cond_syscall(sys_mlockall); cond_syscall(sys_munlockall); +cond_syscall(sys_mlock2); cond_syscall(sys_mincore); cond_syscall(sys_madvise); cond_syscall(sys_mremap); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 96c856b04081..dc6858d6639e 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -888,6 +888,17 @@ static struct ctl_table kern_table[] = { .extra1 = &zero, .extra2 = &one, }, +#ifdef CONFIG_HARDLOCKUP_DETECTOR + { + .procname = "hardlockup_panic", + .data = &hardlockup_panic, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &one, + }, +#endif #ifdef CONFIG_SMP { .procname = "softlockup_all_cpu_backtrace", @@ -898,6 +909,15 @@ static struct ctl_table kern_table[] = { .extra1 = &zero, .extra2 = &one, }, + { + .procname = "hardlockup_all_cpu_backtrace", + .data = &sysctl_hardlockup_all_cpu_backtrace, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &one, + }, #endif /* CONFIG_SMP */ #endif #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 64ed1c37bd1f..18f34cf75f74 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -57,8 +57,10 @@ int __read_mostly watchdog_thresh = 10; #ifdef CONFIG_SMP int __read_mostly sysctl_softlockup_all_cpu_backtrace; +int __read_mostly sysctl_hardlockup_all_cpu_backtrace; #else #define sysctl_softlockup_all_cpu_backtrace 0 +#define sysctl_hardlockup_all_cpu_backtrace 0 #endif static struct cpumask watchdog_cpumask __read_mostly; unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask); @@ -110,8 +112,9 @@ static unsigned long soft_lockup_nmi_warn; * Should we panic when a soft-lockup or hard-lockup occurs: */ #ifdef CONFIG_HARDLOCKUP_DETECTOR -static int hardlockup_panic = +unsigned int __read_mostly hardlockup_panic = CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE; +static unsigned long hardlockup_allcpu_dumped; /* * We may not want to enable hard lockup detection by default in all cases, * for example when running the kernel as a guest on a hypervisor. In these @@ -173,6 +176,13 @@ static int __init softlockup_all_cpu_backtrace_setup(char *str) return 1; } __setup("softlockup_all_cpu_backtrace=", softlockup_all_cpu_backtrace_setup); +static int __init hardlockup_all_cpu_backtrace_setup(char *str) +{ + sysctl_hardlockup_all_cpu_backtrace = + !!simple_strtol(str, NULL, 0); + return 1; +} +__setup("hardlockup_all_cpu_backtrace=", hardlockup_all_cpu_backtrace_setup); #endif /* @@ -263,15 +273,15 @@ void touch_softlockup_watchdog_sync(void) #ifdef CONFIG_HARDLOCKUP_DETECTOR /* watchdog detector functions */ -static int is_hardlockup(void) +static bool is_hardlockup(void) { unsigned long hrint = __this_cpu_read(hrtimer_interrupts); if (__this_cpu_read(hrtimer_interrupts_saved) == hrint) - return 1; + return true; __this_cpu_write(hrtimer_interrupts_saved, hrint); - return 0; + return false; } #endif @@ -279,7 +289,7 @@ static int is_softlockup(unsigned long touch_ts) { unsigned long now = get_timestamp(); - if (watchdog_enabled & SOFT_WATCHDOG_ENABLED) { + if ((watchdog_enabled & SOFT_WATCHDOG_ENABLED) && watchdog_thresh){ /* Warn about unreasonable delays. */ if (time_after(now, touch_ts + get_softlockup_thresh())) return now - touch_ts; @@ -318,17 +328,30 @@ static void watchdog_overflow_callback(struct perf_event *event, */ if (is_hardlockup()) { int this_cpu = smp_processor_id(); + struct pt_regs *regs = get_irq_regs(); /* only print hardlockups once */ if (__this_cpu_read(hard_watchdog_warn) == true) return; - if (hardlockup_panic) - panic("Watchdog detected hard LOCKUP on cpu %d", - this_cpu); + pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu); + print_modules(); + print_irqtrace_events(current); + if (regs) + show_regs(regs); else - WARN(1, "Watchdog detected hard LOCKUP on cpu %d", - this_cpu); + dump_stack(); + + /* + * Perform all-CPU dump only once to avoid multiple hardlockups + * generating interleaving traces + */ + if (sysctl_hardlockup_all_cpu_backtrace && + !test_and_set_bit(0, &hardlockup_allcpu_dumped)) + trigger_allbutself_cpu_backtrace(); + + if (hardlockup_panic) + panic("Hard LOCKUP"); __this_cpu_write(hard_watchdog_warn, true); return; @@ -347,6 +370,9 @@ static void watchdog_interrupt_count(void) static int watchdog_nmi_enable(unsigned int cpu); static void watchdog_nmi_disable(unsigned int cpu); +static int watchdog_enable_all_cpus(void); +static void watchdog_disable_all_cpus(void); + /* watchdog kicker functions */ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) { @@ -651,37 +677,41 @@ static struct smp_hotplug_thread watchdog_threads = { /* * park all watchdog threads that are specified in 'watchdog_cpumask' + * + * This function returns an error if kthread_park() of a watchdog thread + * fails. In this situation, the watchdog threads of some CPUs can already + * be parked and the watchdog threads of other CPUs can still be runnable. + * Callers are expected to handle this special condition as appropriate in + * their context. + * + * This function may only be called in a context that is protected against + * races with CPU hotplug - for example, via get_online_cpus(). */ static int watchdog_park_threads(void) { int cpu, ret = 0; - get_online_cpus(); for_each_watchdog_cpu(cpu) { ret = kthread_park(per_cpu(softlockup_watchdog, cpu)); if (ret) break; } - if (ret) { - for_each_watchdog_cpu(cpu) - kthread_unpark(per_cpu(softlockup_watchdog, cpu)); - } - put_online_cpus(); return ret; } /* * unpark all watchdog threads that are specified in 'watchdog_cpumask' + * + * This function may only be called in a context that is protected against + * races with CPU hotplug - for example, via get_online_cpus(). */ static void watchdog_unpark_threads(void) { int cpu; - get_online_cpus(); for_each_watchdog_cpu(cpu) kthread_unpark(per_cpu(softlockup_watchdog, cpu)); - put_online_cpus(); } /* @@ -691,6 +721,7 @@ int lockup_detector_suspend(void) { int ret = 0; + get_online_cpus(); mutex_lock(&watchdog_proc_mutex); /* * Multiple suspend requests can be active in parallel (counted by @@ -704,6 +735,11 @@ int lockup_detector_suspend(void) if (ret == 0) watchdog_suspended++; + else { + watchdog_disable_all_cpus(); + pr_err("Failed to suspend lockup detectors, disabled\n"); + watchdog_enabled = 0; + } mutex_unlock(&watchdog_proc_mutex); @@ -726,12 +762,20 @@ void lockup_detector_resume(void) watchdog_unpark_threads(); mutex_unlock(&watchdog_proc_mutex); + put_online_cpus(); } -static void update_watchdog_all_cpus(void) +static int update_watchdog_all_cpus(void) { - watchdog_park_threads(); + int ret; + + ret = watchdog_park_threads(); + if (ret) + return ret; + watchdog_unpark_threads(); + + return 0; } static int watchdog_enable_all_cpus(void) @@ -750,15 +794,20 @@ static int watchdog_enable_all_cpus(void) * Enable/disable the lockup detectors or * change the sample period 'on the fly'. */ - update_watchdog_all_cpus(); + err = update_watchdog_all_cpus(); + + if (err) { + watchdog_disable_all_cpus(); + pr_err("Failed to update lockup detectors, disabled\n"); + } } + if (err) + watchdog_enabled = 0; + return err; } -/* prepare/enable/disable routines */ -/* sysctl functions */ -#ifdef CONFIG_SYSCTL static void watchdog_disable_all_cpus(void) { if (watchdog_running) { @@ -767,6 +816,8 @@ static void watchdog_disable_all_cpus(void) } } +#ifdef CONFIG_SYSCTL + /* * Update the run state of the lockup detectors. */ @@ -808,6 +859,7 @@ static int proc_watchdog_common(int which, struct ctl_table *table, int write, int err, old, new; int *watchdog_param = (int *)table->data; + get_online_cpus(); mutex_lock(&watchdog_proc_mutex); if (watchdog_suspended) { @@ -849,15 +901,17 @@ static int proc_watchdog_common(int which, struct ctl_table *table, int write, } while (cmpxchg(&watchdog_enabled, old, new) != old); /* - * Update the run state of the lockup detectors. - * Restore 'watchdog_enabled' on failure. + * Update the run state of the lockup detectors. There is _no_ + * need to check the value returned by proc_watchdog_update() + * and to restore the previous value of 'watchdog_enabled' as + * both lockup detectors are disabled if proc_watchdog_update() + * returns an error. */ err = proc_watchdog_update(); - if (err) - watchdog_enabled = old; } out: mutex_unlock(&watchdog_proc_mutex); + put_online_cpus(); return err; } @@ -899,6 +953,7 @@ int proc_watchdog_thresh(struct ctl_table *table, int write, { int err, old; + get_online_cpus(); mutex_lock(&watchdog_proc_mutex); if (watchdog_suspended) { @@ -914,15 +969,17 @@ int proc_watchdog_thresh(struct ctl_table *table, int write, goto out; /* - * Update the sample period. - * Restore 'watchdog_thresh' on failure. + * Update the sample period. Restore on failure. */ set_sample_period(); err = proc_watchdog_update(); - if (err) + if (err) { watchdog_thresh = old; + set_sample_period(); + } out: mutex_unlock(&watchdog_proc_mutex); + put_online_cpus(); return err; } @@ -937,6 +994,7 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write, { int err; + get_online_cpus(); mutex_lock(&watchdog_proc_mutex); if (watchdog_suspended) { @@ -964,6 +1022,7 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write, } out: mutex_unlock(&watchdog_proc_mutex); + put_online_cpus(); return err; } diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index 39f24d6721e5..0fee5acd5aa0 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -15,8 +15,7 @@ config KASAN global variables requires gcc 5.0 or later. This feature consumes about 1/8 of available memory and brings about ~x3 performance slowdown. - For better error detection enable CONFIG_STACKTRACE, - and add slub_debug=U to boot cmdline. + For better error detection enable CONFIG_STACKTRACE. choice prompt "Instrumentation type" diff --git a/lib/test_kasan.c b/lib/test_kasan.c index c1efb1b61017..c32f3b0048dc 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -138,6 +138,71 @@ static noinline void __init kmalloc_oob_16(void) kfree(ptr2); } +static noinline void __init kmalloc_oob_memset_2(void) +{ + char *ptr; + size_t size = 8; + + pr_info("out-of-bounds in memset2\n"); + ptr = kmalloc(size, GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + + memset(ptr+7, 0, 2); + kfree(ptr); +} + +static noinline void __init kmalloc_oob_memset_4(void) +{ + char *ptr; + size_t size = 8; + + pr_info("out-of-bounds in memset4\n"); + ptr = kmalloc(size, GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + + memset(ptr+5, 0, 4); + kfree(ptr); +} + + +static noinline void __init kmalloc_oob_memset_8(void) +{ + char *ptr; + size_t size = 8; + + pr_info("out-of-bounds in memset8\n"); + ptr = kmalloc(size, GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + + memset(ptr+1, 0, 8); + kfree(ptr); +} + +static noinline void __init kmalloc_oob_memset_16(void) +{ + char *ptr; + size_t size = 16; + + pr_info("out-of-bounds in memset16\n"); + ptr = kmalloc(size, GFP_KERNEL); + if (!ptr) { + pr_err("Allocation failed\n"); + return; + } + + memset(ptr+1, 0, 16); + kfree(ptr); +} + static noinline void __init kmalloc_oob_in_memset(void) { char *ptr; @@ -264,6 +329,10 @@ static int __init kmalloc_tests_init(void) kmalloc_oob_krealloc_less(); kmalloc_oob_16(); kmalloc_oob_in_memset(); + kmalloc_oob_memset_2(); + kmalloc_oob_memset_4(); + kmalloc_oob_memset_8(); + kmalloc_oob_memset_16(); kmalloc_uaf(); kmalloc_uaf_memset(); kmalloc_uaf2(); diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c index fcad8322ef36..d3116be5a00f 100644 --- a/mm/balloon_compaction.c +++ b/mm/balloon_compaction.c @@ -199,23 +199,17 @@ int balloon_page_migrate(struct page *newpage, struct balloon_dev_info *balloon = balloon_page_device(page); int rc = -EAGAIN; - /* - * Block others from accessing the 'newpage' when we get around to - * establishing additional references. We should be the only one - * holding a reference to the 'newpage' at this point. - */ - BUG_ON(!trylock_page(newpage)); + VM_BUG_ON_PAGE(!PageLocked(page), page); + VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); if (WARN_ON(!__is_movable_balloon_page(page))) { dump_page(page, "not movable balloon page"); - unlock_page(newpage); return rc; } if (balloon && balloon->migratepage) rc = balloon->migratepage(balloon, newpage, page, mode); - unlock_page(newpage); return rc; } #endif /* CONFIG_BALLOON_COMPACTION */ @@ -363,7 +363,9 @@ err: */ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align) { - unsigned long mask, offset, pfn, start = 0; + unsigned long mask, offset; + unsigned long pfn = -1; + unsigned long start = 0; unsigned long bitmap_maxno, bitmap_no, bitmap_count; struct page *page = NULL; int ret; @@ -418,7 +420,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align) start = bitmap_no + mask + 1; } - trace_cma_alloc(page ? pfn : -1UL, page, count, align); + trace_cma_alloc(pfn, page, count, align); pr_debug("%s(): returned %p\n", __func__, page); return page; diff --git a/mm/compaction.c b/mm/compaction.c index c5c627aae996..de3e1e71cd9f 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -35,17 +35,6 @@ static inline void count_compact_events(enum vm_event_item item, long delta) #endif #if defined CONFIG_COMPACTION || defined CONFIG_CMA -#ifdef CONFIG_TRACEPOINTS -static const char *const compaction_status_string[] = { - "deferred", - "skipped", - "continue", - "partial", - "complete", - "no_suitable_page", - "not_suitable_zone", -}; -#endif #define CREATE_TRACE_POINTS #include <trace/events/compaction.h> @@ -1197,6 +1186,15 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone, return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE; } +/* + * order == -1 is expected when compacting via + * /proc/sys/vm/compact_memory + */ +static inline bool is_via_compact_memory(int order) +{ + return order == -1; +} + static int __compact_finished(struct zone *zone, struct compact_control *cc, const int migratetype) { @@ -1204,7 +1202,7 @@ static int __compact_finished(struct zone *zone, struct compact_control *cc, unsigned long watermark; if (cc->contended || fatal_signal_pending(current)) - return COMPACT_PARTIAL; + return COMPACT_CONTENDED; /* Compaction run completes if the migrate and free scanner meet */ if (compact_scanners_met(cc)) { @@ -1223,11 +1221,7 @@ static int __compact_finished(struct zone *zone, struct compact_control *cc, return COMPACT_COMPLETE; } - /* - * order == -1 is expected when compacting via - * /proc/sys/vm/compact_memory - */ - if (cc->order == -1) + if (is_via_compact_memory(cc->order)) return COMPACT_CONTINUE; /* Compaction run is not finished if the watermark is not met */ @@ -1290,11 +1284,7 @@ static unsigned long __compaction_suitable(struct zone *zone, int order, int fragindex; unsigned long watermark; - /* - * order == -1 is expected when compacting via - * /proc/sys/vm/compact_memory - */ - if (order == -1) + if (is_via_compact_memory(order)) return COMPACT_CONTINUE; watermark = low_wmark_pages(zone); @@ -1403,7 +1393,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) switch (isolate_migratepages(zone, cc)) { case ISOLATE_ABORT: - ret = COMPACT_PARTIAL; + ret = COMPACT_CONTENDED; putback_movable_pages(&cc->migratepages); cc->nr_migratepages = 0; goto out; @@ -1434,7 +1424,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) * and we want compact_finished() to detect it */ if (err == -ENOMEM && !compact_scanners_met(cc)) { - ret = COMPACT_PARTIAL; + ret = COMPACT_CONTENDED; goto out; } } @@ -1487,6 +1477,9 @@ out: trace_mm_compaction_end(start_pfn, cc->migrate_pfn, cc->free_pfn, end_pfn, sync, ret); + if (ret == COMPACT_CONTENDED) + ret = COMPACT_PARTIAL; + return ret; } @@ -1658,10 +1651,11 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc) * this makes sure we compact the whole zone regardless of * cached scanner positions. */ - if (cc->order == -1) + if (is_via_compact_memory(cc->order)) __reset_isolation_suitable(zone); - if (cc->order == -1 || !compaction_deferred(zone, cc->order)) + if (is_via_compact_memory(cc->order) || + !compaction_deferred(zone, cc->order)) compact_zone(zone, cc); if (cc->order > 0) { diff --git a/mm/debug.c b/mm/debug.c index 6c1b3ea61bfd..e784110fb51d 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -125,6 +125,7 @@ static const struct trace_print_flags vmaflags_names[] = { {VM_GROWSDOWN, "growsdown" }, {VM_PFNMAP, "pfnmap" }, {VM_DENYWRITE, "denywrite" }, + {VM_LOCKONFAULT, "lockonfault" }, {VM_LOCKED, "locked" }, {VM_IO, "io" }, {VM_SEQ_READ, "seqread" }, diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c index 17ae14b5aefa..6d5717bd7197 100644 --- a/mm/early_ioremap.c +++ b/mm/early_ioremap.c @@ -126,7 +126,7 @@ __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot) /* * Mappings have to be page-aligned */ - offset = phys_addr & ~PAGE_MASK; + offset = offset_in_page(phys_addr); phys_addr &= PAGE_MASK; size = PAGE_ALIGN(last_addr + 1) - phys_addr; @@ -189,7 +189,7 @@ void __init early_iounmap(void __iomem *addr, unsigned long size) if (WARN_ON(virt_addr < fix_to_virt(FIX_BTMAP_BEGIN))) return; - offset = virt_addr & ~PAGE_MASK; + offset = offset_in_page(virt_addr); nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT; idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot; @@ -234,7 +234,7 @@ void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size) char *p; while (size) { - slop = src & ~PAGE_MASK; + slop = offset_in_page(src); clen = size; if (clen > MAX_MAP_CHUNK - slop) clen = MAX_MAP_CHUNK - slop; diff --git a/mm/filemap.c b/mm/filemap.c index 327910c2400c..58e04e26f996 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -331,23 +331,14 @@ int filemap_flush(struct address_space *mapping) } EXPORT_SYMBOL(filemap_flush); -/** - * filemap_fdatawait_range - wait for writeback to complete - * @mapping: address space structure to wait for - * @start_byte: offset in bytes where the range starts - * @end_byte: offset in bytes where the range ends (inclusive) - * - * Walk the list of under-writeback pages of the given address space - * in the given range and wait for all of them. - */ -int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte, - loff_t end_byte) +static int __filemap_fdatawait_range(struct address_space *mapping, + loff_t start_byte, loff_t end_byte) { pgoff_t index = start_byte >> PAGE_CACHE_SHIFT; pgoff_t end = end_byte >> PAGE_CACHE_SHIFT; struct pagevec pvec; int nr_pages; - int ret2, ret = 0; + int ret = 0; if (end_byte < start_byte) goto out; @@ -374,6 +365,29 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte, cond_resched(); } out: + return ret; +} + +/** + * filemap_fdatawait_range - wait for writeback to complete + * @mapping: address space structure to wait for + * @start_byte: offset in bytes where the range starts + * @end_byte: offset in bytes where the range ends (inclusive) + * + * Walk the list of under-writeback pages of the given address space + * in the given range and wait for all of them. Check error status of + * the address space and return it. + * + * Since the error status of the address space is cleared by this function, + * callers are responsible for checking the return value and handling and/or + * reporting the error. + */ +int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte, + loff_t end_byte) +{ + int ret, ret2; + + ret = __filemap_fdatawait_range(mapping, start_byte, end_byte); ret2 = filemap_check_errors(mapping); if (!ret) ret = ret2; @@ -383,11 +397,38 @@ out: EXPORT_SYMBOL(filemap_fdatawait_range); /** + * filemap_fdatawait_keep_errors - wait for writeback without clearing errors + * @mapping: address space structure to wait for + * + * Walk the list of under-writeback pages of the given address space + * and wait for all of them. Unlike filemap_fdatawait(), this function + * does not clear error status of the address space. + * + * Use this function if callers don't handle errors themselves. Expected + * call sites are system-wide / filesystem-wide data flushers: e.g. sync(2), + * fsfreeze(8) + */ +void filemap_fdatawait_keep_errors(struct address_space *mapping) +{ + loff_t i_size = i_size_read(mapping->host); + + if (i_size == 0) + return; + + __filemap_fdatawait_range(mapping, 0, i_size - 1); +} + +/** * filemap_fdatawait - wait for all under-writeback pages to complete * @mapping: address space structure to wait for * * Walk the list of under-writeback pages of the given address space - * and wait for all of them. + * and wait for all of them. Check error status of the address space + * and return it. + * + * Since the error status of the address space is cleared by this function, + * callers are responsible for checking the return value and handling and/or + * reporting the error. */ int filemap_fdatawait(struct address_space *mapping) { @@ -510,7 +551,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask) __inc_zone_page_state(new, NR_SHMEM); spin_unlock_irqrestore(&mapping->tree_lock, flags); mem_cgroup_end_page_stat(memcg); - mem_cgroup_migrate(old, new, true); + mem_cgroup_replace_page(old, new); radix_tree_preload_end(); if (freepage) freepage(old); @@ -1807,7 +1848,6 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma, struct file *file, pgoff_t offset) { - unsigned long ra_pages; struct address_space *mapping = file->f_mapping; /* If we don't want any read-ahead, don't bother */ @@ -1836,10 +1876,9 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma, /* * mmap read-around */ - ra_pages = max_sane_readahead(ra->ra_pages); - ra->start = max_t(long, 0, offset - ra_pages / 2); - ra->size = ra_pages; - ra->async_size = ra_pages / 4; + ra->start = max_t(long, 0, offset - ra->ra_pages / 2); + ra->size = ra->ra_pages; + ra->async_size = ra->ra_pages / 4; ra_submit(ra, mapping, file); } diff --git a/mm/frame_vector.c b/mm/frame_vector.c index cdabcb93c6a6..7cf2b7163222 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -7,7 +7,7 @@ #include <linux/pagemap.h> #include <linux/sched.h> -/* +/** * get_vaddr_frames() - map virtual addresses to pfns * @start: starting user address * @nr_frames: number of pages / pfns from start to map @@ -129,7 +129,7 @@ retry: */ mark_page_accessed(page); } - if ((flags & FOLL_POPULATE) && (vma->vm_flags & VM_LOCKED)) { + if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) { /* * The preliminary mapping check is mainly to avoid the * pointless overhead of lock_page on the ZERO_PAGE @@ -299,6 +299,9 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma, unsigned int fault_flags = 0; int ret; + /* mlock all present pages, but do not fault in new pages */ + if ((*flags & (FOLL_POPULATE | FOLL_MLOCK)) == FOLL_MLOCK) + return -ENOENT; /* For mm_populate(), just skip the stack guard page. */ if ((*flags & FOLL_POPULATE) && (stack_guard_page_start(vma, address) || @@ -890,7 +893,10 @@ long populate_vma_page_range(struct vm_area_struct *vma, VM_BUG_ON_VMA(end > vma->vm_end, vma); VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm); - gup_flags = FOLL_TOUCH | FOLL_POPULATE; + gup_flags = FOLL_TOUCH | FOLL_POPULATE | FOLL_MLOCK; + if (vma->vm_flags & VM_LOCKONFAULT) + gup_flags &= ~FOLL_POPULATE; + /* * We want to touch writable mappings with a write fault in order * to break COW, except for shared mappings because these don't COW diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 3fd0311c3ba7..f5c08b46fef8 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1307,7 +1307,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, pmd, _pmd, 1)) update_mmu_cache_pmd(vma, addr, pmd); } - if ((flags & FOLL_POPULATE) && (vma->vm_flags & VM_LOCKED)) { + if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) { if (page->mapping && trylock_page(page)) { lru_add_drain(); if (page->mapping) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 9cc773483624..74ef0c6a25dd 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1437,7 +1437,82 @@ void dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn) dissolve_free_huge_page(pfn_to_page(pfn)); } -static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) +/* + * There are 3 ways this can get called: + * 1. With vma+addr: we use the VMA's memory policy + * 2. With !vma, but nid=NUMA_NO_NODE: We try to allocate a huge + * page from any node, and let the buddy allocator itself figure + * it out. + * 3. With !vma, but nid!=NUMA_NO_NODE. We allocate a huge page + * strictly from 'nid' + */ +static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h, + struct vm_area_struct *vma, unsigned long addr, int nid) +{ + int order = huge_page_order(h); + gfp_t gfp = htlb_alloc_mask(h)|__GFP_COMP|__GFP_REPEAT|__GFP_NOWARN; + unsigned int cpuset_mems_cookie; + + /* + * We need a VMA to get a memory policy. If we do not + * have one, we use the 'nid' argument. + * + * The mempolicy stuff below has some non-inlined bits + * and calls ->vm_ops. That makes it hard to optimize at + * compile-time, even when NUMA is off and it does + * nothing. This helps the compiler optimize it out. + */ + if (!IS_ENABLED(CONFIG_NUMA) || !vma) { + /* + * If a specific node is requested, make sure to + * get memory from there, but only when a node + * is explicitly specified. + */ + if (nid != NUMA_NO_NODE) + gfp |= __GFP_THISNODE; + /* + * Make sure to call something that can handle + * nid=NUMA_NO_NODE + */ + return alloc_pages_node(nid, gfp, order); + } + + /* + * OK, so we have a VMA. Fetch the mempolicy and try to + * allocate a huge page with it. We will only reach this + * when CONFIG_NUMA=y. + */ + do { + struct page *page; + struct mempolicy *mpol; + struct zonelist *zl; + nodemask_t *nodemask; + + cpuset_mems_cookie = read_mems_allowed_begin(); + zl = huge_zonelist(vma, addr, gfp, &mpol, &nodemask); + mpol_cond_put(mpol); + page = __alloc_pages_nodemask(gfp, order, zl, nodemask); + if (page) + return page; + } while (read_mems_allowed_retry(cpuset_mems_cookie)); + + return NULL; +} + +/* + * There are two ways to allocate a huge page: + * 1. When you have a VMA and an address (like a fault) + * 2. When you have no VMA (like when setting /proc/.../nr_hugepages) + * + * 'vma' and 'addr' are only for (1). 'nid' is always NUMA_NO_NODE in + * this case which signifies that the allocation should be done with + * respect for the VMA's memory policy. + * + * For (2), we ignore 'vma' and 'addr' and use 'nid' exclusively. This + * implies that memory policies will not be taken in to account. + */ +static struct page *__alloc_buddy_huge_page(struct hstate *h, + struct vm_area_struct *vma, unsigned long addr, int nid) { struct page *page; unsigned int r_nid; @@ -1446,6 +1521,15 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) return NULL; /* + * Make sure that anyone specifying 'nid' is not also specifying a VMA. + * This makes sure the caller is picking _one_ of the modes with which + * we can call this function, not both. + */ + if (vma || (addr != -1)) { + VM_WARN_ON_ONCE(addr == -1); + VM_WARN_ON_ONCE(nid != NUMA_NO_NODE); + } + /* * Assume we will successfully allocate the surplus page to * prevent racing processes from causing the surplus to exceed * overcommit @@ -1478,14 +1562,7 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) } spin_unlock(&hugetlb_lock); - if (nid == NUMA_NO_NODE) - page = alloc_pages(htlb_alloc_mask(h)|__GFP_COMP| - __GFP_REPEAT|__GFP_NOWARN, - huge_page_order(h)); - else - page = __alloc_pages_node(nid, - htlb_alloc_mask(h)|__GFP_COMP|__GFP_THISNODE| - __GFP_REPEAT|__GFP_NOWARN, huge_page_order(h)); + page = __hugetlb_alloc_buddy_huge_page(h, vma, addr, nid); spin_lock(&hugetlb_lock); if (page) { @@ -1510,6 +1587,29 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) } /* + * Allocate a huge page from 'nid'. Note, 'nid' may be + * NUMA_NO_NODE, which means that it may be allocated + * anywhere. + */ +static +struct page *__alloc_buddy_huge_page_no_mpol(struct hstate *h, int nid) +{ + unsigned long addr = -1; + + return __alloc_buddy_huge_page(h, NULL, addr, nid); +} + +/* + * Use the VMA's mpolicy to allocate a huge page from the buddy. + */ +static +struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h, + struct vm_area_struct *vma, unsigned long addr) +{ + return __alloc_buddy_huge_page(h, vma, addr, NUMA_NO_NODE); +} + +/* * This allocation function is useful in the context where vma is irrelevant. * E.g. soft-offlining uses this function because it only cares physical * address of error page. @@ -1524,7 +1624,7 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid) spin_unlock(&hugetlb_lock); if (!page) - page = alloc_buddy_huge_page(h, nid); + page = __alloc_buddy_huge_page_no_mpol(h, nid); return page; } @@ -1554,7 +1654,7 @@ static int gather_surplus_pages(struct hstate *h, int delta) retry: spin_unlock(&hugetlb_lock); for (i = 0; i < needed; i++) { - page = alloc_buddy_huge_page(h, NUMA_NO_NODE); + page = __alloc_buddy_huge_page_no_mpol(h, NUMA_NO_NODE); if (!page) { alloc_ok = false; break; @@ -1787,7 +1887,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, gbl_chg); if (!page) { spin_unlock(&hugetlb_lock); - page = alloc_buddy_huge_page(h, NUMA_NO_NODE); + page = __alloc_buddy_huge_page_with_mpol(h, vma, addr); if (!page) goto out_uncharge_cgroup; @@ -2376,7 +2476,7 @@ struct node_hstate { struct kobject *hugepages_kobj; struct kobject *hstate_kobjs[HUGE_MAX_HSTATE]; }; -struct node_hstate node_hstates[MAX_NUMNODES]; +static struct node_hstate node_hstates[MAX_NUMNODES]; /* * A subset of global hstate attributes for node devices @@ -2790,6 +2890,12 @@ void hugetlb_show_meminfo(void) 1UL << (huge_page_order(h) + PAGE_SHIFT - 10)); } +void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm) +{ + seq_printf(m, "HugetlbPages:\t%8lu kB\n", + atomic_long_read(&mm->hugetlb_usage) << (PAGE_SHIFT - 10)); +} + /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ unsigned long hugetlb_total_pages(void) { @@ -3025,6 +3131,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, get_page(ptepage); page_dup_rmap(ptepage); set_huge_pte_at(dst, addr, dst_pte, entry); + hugetlb_count_add(pages_per_huge_page(h), dst); } spin_unlock(src_ptl); spin_unlock(dst_ptl); @@ -3105,6 +3212,7 @@ again: if (huge_pte_dirty(pte)) set_page_dirty(page); + hugetlb_count_sub(pages_per_huge_page(h), mm); page_remove_rmap(page); force_flush = !__tlb_remove_page(tlb, page); if (force_flush) { @@ -3509,6 +3617,7 @@ retry: && (vma->vm_flags & VM_SHARED))); set_huge_pte_at(mm, address, ptep, new_pte); + hugetlb_count_add(pages_per_huge_page(h), mm); if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) { /* Optimization, do the COW without a second fault */ ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page, ptl); @@ -4028,8 +4137,8 @@ static unsigned long page_table_shareable(struct vm_area_struct *svma, unsigned long s_end = sbase + PUD_SIZE; /* Allow segments to share if only one is marked locked */ - unsigned long vm_flags = vma->vm_flags & ~VM_LOCKED; - unsigned long svm_flags = svma->vm_flags & ~VM_LOCKED; + unsigned long vm_flags = vma->vm_flags & VM_LOCKED_CLEAR_MASK; + unsigned long svm_flags = svma->vm_flags & VM_LOCKED_CLEAR_MASK; /* * match the virtual addresses, permission and the alignment of the diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c index 6e0057439a46..33d59abe91f1 100644 --- a/mm/hugetlb_cgroup.c +++ b/mm/hugetlb_cgroup.c @@ -186,7 +186,8 @@ again: } rcu_read_unlock(); - ret = page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter); + if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter)) + ret = -ENOMEM; css_put(&h_cg->css); done: *ptr = h_cg; diff --git a/mm/internal.h b/mm/internal.h index bc0fa9a69e46..d4b807d6c963 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -271,20 +271,19 @@ extern unsigned int munlock_vma_page(struct page *page); extern void clear_page_mlock(struct page *page); /* - * mlock_migrate_page - called only from migrate_page_copy() to - * migrate the Mlocked page flag; update statistics. + * mlock_migrate_page - called only from migrate_misplaced_transhuge_page() + * (because that does not go through the full procedure of migration ptes): + * to migrate the Mlocked page flag; update statistics. */ static inline void mlock_migrate_page(struct page *newpage, struct page *page) { if (TestClearPageMlocked(page)) { - unsigned long flags; int nr_pages = hpage_nr_pages(page); - local_irq_save(flags); + /* Holding pmd lock, no change in irq context: __mod is safe */ __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages); SetPageMlocked(newpage); __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages); - local_irq_restore(flags); } } diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c index 8da211411b57..d41b21bce6a0 100644 --- a/mm/kasan/kasan.c +++ b/mm/kasan/kasan.c @@ -4,7 +4,7 @@ * Copyright (c) 2014 Samsung Electronics Co., Ltd. * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com> * - * Some of code borrowed from https://github.com/xairy/linux by + * Some code borrowed from https://github.com/xairy/kasan-prototype by * Andrey Konovalov <adech.fo@gmail.com> * * This program is free software; you can redistribute it and/or modify @@ -86,6 +86,11 @@ static __always_inline bool memory_is_poisoned_2(unsigned long addr) if (memory_is_poisoned_1(addr + 1)) return true; + /* + * If single shadow byte covers 2-byte access, we don't + * need to do anything more. Otherwise, test the first + * shadow byte. + */ if (likely(((addr + 1) & KASAN_SHADOW_MASK) != 0)) return false; @@ -103,6 +108,11 @@ static __always_inline bool memory_is_poisoned_4(unsigned long addr) if (memory_is_poisoned_1(addr + 3)) return true; + /* + * If single shadow byte covers 4-byte access, we don't + * need to do anything more. Otherwise, test the first + * shadow byte. + */ if (likely(((addr + 3) & KASAN_SHADOW_MASK) >= 3)) return false; @@ -120,7 +130,12 @@ static __always_inline bool memory_is_poisoned_8(unsigned long addr) if (memory_is_poisoned_1(addr + 7)) return true; - if (likely(((addr + 7) & KASAN_SHADOW_MASK) >= 7)) + /* + * If single shadow byte covers 8-byte access, we don't + * need to do anything more. Otherwise, test the first + * shadow byte. + */ + if (likely(IS_ALIGNED(addr, KASAN_SHADOW_SCALE_SIZE))) return false; return unlikely(*(u8 *)shadow_addr); @@ -139,7 +154,12 @@ static __always_inline bool memory_is_poisoned_16(unsigned long addr) if (unlikely(shadow_first_bytes)) return true; - if (likely(IS_ALIGNED(addr, 8))) + /* + * If two shadow bytes covers 16-byte access, we don't + * need to do anything more. Otherwise, test the last + * shadow byte. + */ + if (likely(IS_ALIGNED(addr, KASAN_SHADOW_SCALE_SIZE))) return false; return memory_is_poisoned_1(addr + 15); @@ -203,7 +223,7 @@ static __always_inline bool memory_is_poisoned_n(unsigned long addr, s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte); if (unlikely(ret != (unsigned long)last_shadow || - ((last_byte & KASAN_SHADOW_MASK) >= *last_shadow))) + ((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow))) return true; } return false; @@ -235,18 +255,12 @@ static __always_inline bool memory_is_poisoned(unsigned long addr, size_t size) static __always_inline void check_memory_region(unsigned long addr, size_t size, bool write) { - struct kasan_access_info info; - if (unlikely(size == 0)) return; if (unlikely((void *)addr < kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) { - info.access_addr = (void *)addr; - info.access_size = size; - info.is_write = write; - info.ip = _RET_IP_; - kasan_report_user_access(&info); + kasan_report(addr, size, write, _RET_IP_); return; } @@ -524,7 +538,7 @@ static int kasan_mem_notifier(struct notifier_block *nb, static int __init kasan_memhotplug_init(void) { - pr_err("WARNING: KASan doesn't support memory hot-add\n"); + pr_err("WARNING: KASAN doesn't support memory hot-add\n"); pr_err("Memory hot-add will be disabled\n"); hotplug_memory_notifier(kasan_mem_notifier, 0); diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index c242adf6bc85..4f6c62e5c21e 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -54,16 +54,13 @@ struct kasan_global { #endif }; -void kasan_report_error(struct kasan_access_info *info); -void kasan_report_user_access(struct kasan_access_info *info); - static inline const void *kasan_shadow_to_mem(const void *shadow_addr) { return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) << KASAN_SHADOW_SCALE_SHIFT); } -static inline bool kasan_enabled(void) +static inline bool kasan_report_enabled(void) { return !current->kasan_depth; } diff --git a/mm/kasan/report.c b/mm/kasan/report.c index e07c94fbd0ac..12f222d0224b 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -4,7 +4,7 @@ * Copyright (c) 2014 Samsung Electronics Co., Ltd. * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com> * - * Some of code borrowed from https://github.com/xairy/linux by + * Some code borrowed from https://github.com/xairy/kasan-prototype by * Andrey Konovalov <adech.fo@gmail.com> * * This program is free software; you can redistribute it and/or modify @@ -22,6 +22,7 @@ #include <linux/string.h> #include <linux/types.h> #include <linux/kasan.h> +#include <linux/module.h> #include <asm/sections.h> @@ -48,34 +49,49 @@ static const void *find_first_bad_addr(const void *addr, size_t size) static void print_error_description(struct kasan_access_info *info) { - const char *bug_type = "unknown crash"; - u8 shadow_val; + const char *bug_type = "unknown-crash"; + u8 *shadow_addr; info->first_bad_addr = find_first_bad_addr(info->access_addr, info->access_size); - shadow_val = *(u8 *)kasan_mem_to_shadow(info->first_bad_addr); + shadow_addr = (u8 *)kasan_mem_to_shadow(info->first_bad_addr); - switch (shadow_val) { - case KASAN_FREE_PAGE: - case KASAN_KMALLOC_FREE: - bug_type = "use after free"; + /* + * If shadow byte value is in [0, KASAN_SHADOW_SCALE_SIZE) we can look + * at the next shadow byte to determine the type of the bad access. + */ + if (*shadow_addr > 0 && *shadow_addr <= KASAN_SHADOW_SCALE_SIZE - 1) + shadow_addr++; + + switch (*shadow_addr) { + case 0 ... KASAN_SHADOW_SCALE_SIZE - 1: + /* + * In theory it's still possible to see these shadow values + * due to a data race in the kernel code. + */ + bug_type = "out-of-bounds"; break; case KASAN_PAGE_REDZONE: case KASAN_KMALLOC_REDZONE: + bug_type = "slab-out-of-bounds"; + break; case KASAN_GLOBAL_REDZONE: - case 0 ... KASAN_SHADOW_SCALE_SIZE - 1: - bug_type = "out of bounds access"; + bug_type = "global-out-of-bounds"; break; case KASAN_STACK_LEFT: case KASAN_STACK_MID: case KASAN_STACK_RIGHT: case KASAN_STACK_PARTIAL: - bug_type = "out of bounds on stack"; + bug_type = "stack-out-of-bounds"; + break; + case KASAN_FREE_PAGE: + case KASAN_KMALLOC_FREE: + bug_type = "use-after-free"; break; } - pr_err("BUG: KASan: %s in %pS at addr %p\n", + pr_err("BUG: KASAN: %s in %pS at addr %p\n", bug_type, (void *)info->ip, info->access_addr); pr_err("%s of size %zu by task %s/%d\n", @@ -85,9 +101,11 @@ static void print_error_description(struct kasan_access_info *info) static inline bool kernel_or_module_addr(const void *addr) { - return (addr >= (void *)_stext && addr < (void *)_end) - || (addr >= (void *)MODULES_VADDR - && addr < (void *)MODULES_END); + if (addr >= (void *)_stext && addr < (void *)_end) + return true; + if (is_module_address((unsigned long)addr)) + return true; + return false; } static inline bool init_task_stack_addr(const void *addr) @@ -161,15 +179,19 @@ static void print_shadow_for_address(const void *addr) for (i = -SHADOW_ROWS_AROUND_ADDR; i <= SHADOW_ROWS_AROUND_ADDR; i++) { const void *kaddr = kasan_shadow_to_mem(shadow_row); char buffer[4 + (BITS_PER_LONG/8)*2]; + char shadow_buf[SHADOW_BYTES_PER_ROW]; snprintf(buffer, sizeof(buffer), (i == 0) ? ">%p: " : " %p: ", kaddr); - - kasan_disable_current(); + /* + * We should not pass a shadow pointer to generic + * function, because generic functions may try to + * access kasan mapping for the passed address. + */ + memcpy(shadow_buf, shadow_row, SHADOW_BYTES_PER_ROW); print_hex_dump(KERN_ERR, buffer, DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1, - shadow_row, SHADOW_BYTES_PER_ROW, 0); - kasan_enable_current(); + shadow_buf, SHADOW_BYTES_PER_ROW, 0); if (row_is_guilty(shadow_row, shadow)) pr_err("%*c\n", @@ -182,37 +204,43 @@ static void print_shadow_for_address(const void *addr) static DEFINE_SPINLOCK(report_lock); -void kasan_report_error(struct kasan_access_info *info) -{ - unsigned long flags; - - spin_lock_irqsave(&report_lock, flags); - pr_err("=================================" - "=================================\n"); - print_error_description(info); - print_address_description(info); - print_shadow_for_address(info->first_bad_addr); - pr_err("=================================" - "=================================\n"); - spin_unlock_irqrestore(&report_lock, flags); -} - -void kasan_report_user_access(struct kasan_access_info *info) +static void kasan_report_error(struct kasan_access_info *info) { unsigned long flags; + const char *bug_type; + /* + * Make sure we don't end up in loop. + */ + kasan_disable_current(); spin_lock_irqsave(&report_lock, flags); pr_err("=================================" "=================================\n"); - pr_err("BUG: KASan: user-memory-access on address %p\n", - info->access_addr); - pr_err("%s of size %zu by task %s/%d\n", - info->is_write ? "Write" : "Read", - info->access_size, current->comm, task_pid_nr(current)); - dump_stack(); + if (info->access_addr < + kasan_shadow_to_mem((void *)KASAN_SHADOW_START)) { + if ((unsigned long)info->access_addr < PAGE_SIZE) + bug_type = "null-ptr-deref"; + else if ((unsigned long)info->access_addr < TASK_SIZE) + bug_type = "user-memory-access"; + else + bug_type = "wild-memory-access"; + pr_err("BUG: KASAN: %s on address %p\n", + bug_type, info->access_addr); + pr_err("%s of size %zu by task %s/%d\n", + info->is_write ? "Write" : "Read", + info->access_size, current->comm, + task_pid_nr(current)); + dump_stack(); + } else { + print_error_description(info); + print_address_description(info); + print_shadow_for_address(info->first_bad_addr); + } pr_err("=================================" "=================================\n"); + add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irqrestore(&report_lock, flags); + kasan_enable_current(); } void kasan_report(unsigned long addr, size_t size, @@ -220,13 +248,14 @@ void kasan_report(unsigned long addr, size_t size, { struct kasan_access_info info; - if (likely(!kasan_enabled())) + if (likely(!kasan_report_enabled())) return; info.access_addr = (void *)addr; info.access_size = size; info.is_write = is_write; info.ip = ip; + kasan_report_error(&info); } diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 77191eccdc6f..19423a45d7d7 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -479,7 +479,7 @@ static void put_object(struct kmemleak_object *object) static struct kmemleak_object *find_and_get_object(unsigned long ptr, int alias) { unsigned long flags; - struct kmemleak_object *object = NULL; + struct kmemleak_object *object; rcu_read_lock(); read_lock_irqsave(&kmemleak_lock, flags); @@ -475,7 +475,8 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item) flush_dcache_page(page); } else { put_page(page); -out: page = NULL; +out: + page = NULL; } up_read(&mm->mmap_sem); return page; @@ -625,7 +626,7 @@ static void remove_rmap_item_from_tree(struct rmap_item *rmap_item) unlock_page(page); put_page(page); - if (stable_node->hlist.first) + if (!hlist_empty(&stable_node->hlist)) ksm_pages_sharing--; else ksm_pages_shared--; @@ -1021,8 +1022,6 @@ static int try_to_merge_one_page(struct vm_area_struct *vma, if (page == kpage) /* ksm page forked */ return 0; - if (!(vma->vm_flags & VM_MERGEABLE)) - goto out; if (PageTransCompound(page) && page_trans_compound_anon_split(page)) goto out; BUG_ON(PageTransCompound(page)); @@ -1087,10 +1086,8 @@ static int try_to_merge_with_ksm_page(struct rmap_item *rmap_item, int err = -EFAULT; down_read(&mm->mmap_sem); - if (ksm_test_exit(mm)) - goto out; - vma = find_vma(mm, rmap_item->address); - if (!vma || vma->vm_start > rmap_item->address) + vma = find_mergeable_vma(mm, rmap_item->address); + if (!vma) goto out; err = try_to_merge_one_page(vma, page, kpage); @@ -1177,8 +1174,18 @@ again: cond_resched(); stable_node = rb_entry(*new, struct stable_node, node); tree_page = get_ksm_page(stable_node, false); - if (!tree_page) - return NULL; + if (!tree_page) { + /* + * If we walked over a stale stable_node, + * get_ksm_page() will call rb_erase() and it + * may rebalance the tree from under us. So + * restart the search from scratch. Returning + * NULL would be safe too, but we'd generate + * false negative insertions just because some + * stable_node was stale. + */ + goto again; + } ret = memcmp_pages(page, tree_page); put_page(tree_page); @@ -1254,12 +1261,14 @@ static struct stable_node *stable_tree_insert(struct page *kpage) unsigned long kpfn; struct rb_root *root; struct rb_node **new; - struct rb_node *parent = NULL; + struct rb_node *parent; struct stable_node *stable_node; kpfn = page_to_pfn(kpage); nid = get_kpfn_nid(kpfn); root = root_stable_tree + nid; +again: + parent = NULL; new = &root->rb_node; while (*new) { @@ -1269,8 +1278,18 @@ static struct stable_node *stable_tree_insert(struct page *kpage) cond_resched(); stable_node = rb_entry(*new, struct stable_node, node); tree_page = get_ksm_page(stable_node, false); - if (!tree_page) - return NULL; + if (!tree_page) { + /* + * If we walked over a stale stable_node, + * get_ksm_page() will call rb_erase() and it + * may rebalance the tree from under us. So + * restart the search from scratch. Returning + * NULL would be safe too, but we'd generate + * false negative insertions just because some + * stable_node was stale. + */ + goto again; + } ret = memcmp_pages(kpage, tree_page); put_page(tree_page); @@ -1340,7 +1359,7 @@ struct rmap_item *unstable_tree_search_insert(struct rmap_item *rmap_item, cond_resched(); tree_rmap_item = rb_entry(*new, struct rmap_item, node); tree_page = get_mergeable_page(tree_rmap_item); - if (IS_ERR_OR_NULL(tree_page)) + if (!tree_page) return NULL; /* @@ -1914,9 +1933,11 @@ again: struct anon_vma_chain *vmac; struct vm_area_struct *vma; + cond_resched(); anon_vma_lock_read(anon_vma); anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root, 0, ULONG_MAX) { + cond_resched(); vma = vmac->vma; if (rmap_item->address < vma->vm_start || rmap_item->address >= vma->vm_end) diff --git a/mm/list_lru.c b/mm/list_lru.c index e1da19fac1b3..afc71ea9a381 100644 --- a/mm/list_lru.c +++ b/mm/list_lru.c @@ -42,6 +42,10 @@ static void list_lru_unregister(struct list_lru *lru) #ifdef CONFIG_MEMCG_KMEM static inline bool list_lru_memcg_aware(struct list_lru *lru) { + /* + * This needs node 0 to be always present, even + * in the systems supporting sparse numa ids. + */ return !!lru->node[0].memcg_lrus; } @@ -59,6 +63,16 @@ list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx) return &nlru->lru; } +static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr) +{ + struct page *page; + + if (!memcg_kmem_enabled()) + return NULL; + page = virt_to_head_page(ptr); + return page->mem_cgroup; +} + static inline struct list_lru_one * list_lru_from_kmem(struct list_lru_node *nlru, void *ptr) { @@ -377,16 +391,20 @@ static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware) { int i; - for (i = 0; i < nr_node_ids; i++) { - if (!memcg_aware) - lru->node[i].memcg_lrus = NULL; - else if (memcg_init_list_lru_node(&lru->node[i])) + if (!memcg_aware) + return 0; + + for_each_node(i) { + if (memcg_init_list_lru_node(&lru->node[i])) goto fail; } return 0; fail: - for (i = i - 1; i >= 0; i--) + for (i = i - 1; i >= 0; i--) { + if (!lru->node[i].memcg_lrus) + continue; memcg_destroy_list_lru_node(&lru->node[i]); + } return -ENOMEM; } @@ -397,7 +415,7 @@ static void memcg_destroy_list_lru(struct list_lru *lru) if (!list_lru_memcg_aware(lru)) return; - for (i = 0; i < nr_node_ids; i++) + for_each_node(i) memcg_destroy_list_lru_node(&lru->node[i]); } @@ -409,16 +427,20 @@ static int memcg_update_list_lru(struct list_lru *lru, if (!list_lru_memcg_aware(lru)) return 0; - for (i = 0; i < nr_node_ids; i++) { + for_each_node(i) { if (memcg_update_list_lru_node(&lru->node[i], old_size, new_size)) goto fail; } return 0; fail: - for (i = i - 1; i >= 0; i--) + for (i = i - 1; i >= 0; i--) { + if (!lru->node[i].memcg_lrus) + continue; + memcg_cancel_update_list_lru_node(&lru->node[i], old_size, new_size); + } return -ENOMEM; } @@ -430,7 +452,7 @@ static void memcg_cancel_update_list_lru(struct list_lru *lru, if (!list_lru_memcg_aware(lru)) return; - for (i = 0; i < nr_node_ids; i++) + for_each_node(i) memcg_cancel_update_list_lru_node(&lru->node[i], old_size, new_size); } @@ -485,7 +507,7 @@ static void memcg_drain_list_lru(struct list_lru *lru, if (!list_lru_memcg_aware(lru)) return; - for (i = 0; i < nr_node_ids; i++) + for_each_node(i) memcg_drain_list_lru_node(&lru->node[i], src_idx, dst_idx); } @@ -522,7 +544,7 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware, if (!lru->node) goto out; - for (i = 0; i < nr_node_ids; i++) { + for_each_node(i) { spin_lock_init(&lru->node[i].lock); if (key) lockdep_set_class(&lru->node[i].lock, key); diff --git a/mm/maccess.c b/mm/maccess.c index 34fe24759ed1..d159b1c96e48 100644 --- a/mm/maccess.c +++ b/mm/maccess.c @@ -13,6 +13,11 @@ * * Safely read from address @src to the buffer at @dst. If a kernel fault * happens, handle that and return -EFAULT. + * + * We ensure that the copy_from_user is executed in atomic context so that + * do_page_fault() doesn't attempt to take mmap_sem. This makes + * probe_kernel_read() suitable for use within regions where the caller + * already holds mmap_sem, or other locks which nest inside mmap_sem. */ long __weak probe_kernel_read(void *dst, const void *src, size_t size) @@ -99,5 +104,5 @@ long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count) pagefault_enable(); set_fs(old_fs); - return ret < 0 ? ret : src - unsafe_addr; + return ret ? -EFAULT : src - unsafe_addr; } diff --git a/mm/memblock.c b/mm/memblock.c index 1c7b647e5897..d300f1329814 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -706,7 +706,7 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type, return 0; } -int __init_memblock memblock_remove_range(struct memblock_type *type, +static int __init_memblock memblock_remove_range(struct memblock_type *type, phys_addr_t base, phys_addr_t size) { int start_rgn, end_rgn; diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b732edfddb76..bc502e590366 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -62,6 +62,7 @@ #include <linux/oom.h> #include <linux/lockdep.h> #include <linux/file.h> +#include <linux/tracehook.h> #include "internal.h" #include <net/sock.h> #include <net/ip.h> @@ -1661,7 +1662,7 @@ static void memcg_oom_recover(struct mem_cgroup *memcg) static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order) { - if (!current->memcg_oom.may_oom) + if (!current->memcg_may_oom) return; /* * We are in the middle of the charge context here, so we @@ -1678,9 +1679,9 @@ static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order) * and when we know whether the fault was overall successful. */ css_get(&memcg->css); - current->memcg_oom.memcg = memcg; - current->memcg_oom.gfp_mask = mask; - current->memcg_oom.order = order; + current->memcg_in_oom = memcg; + current->memcg_oom_gfp_mask = mask; + current->memcg_oom_order = order; } /** @@ -1702,7 +1703,7 @@ static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order) */ bool mem_cgroup_oom_synchronize(bool handle) { - struct mem_cgroup *memcg = current->memcg_oom.memcg; + struct mem_cgroup *memcg = current->memcg_in_oom; struct oom_wait_info owait; bool locked; @@ -1730,8 +1731,8 @@ bool mem_cgroup_oom_synchronize(bool handle) if (locked && !memcg->oom_kill_disable) { mem_cgroup_unmark_under_oom(memcg); finish_wait(&memcg_oom_waitq, &owait.wait); - mem_cgroup_out_of_memory(memcg, current->memcg_oom.gfp_mask, - current->memcg_oom.order); + mem_cgroup_out_of_memory(memcg, current->memcg_oom_gfp_mask, + current->memcg_oom_order); } else { schedule(); mem_cgroup_unmark_under_oom(memcg); @@ -1748,7 +1749,7 @@ bool mem_cgroup_oom_synchronize(bool handle) memcg_oom_recover(memcg); } cleanup: - current->memcg_oom.memcg = NULL; + current->memcg_in_oom = NULL; css_put(&memcg->css); return true; } @@ -1972,6 +1973,31 @@ static int memcg_cpu_hotplug_callback(struct notifier_block *nb, return NOTIFY_OK; } +/* + * Scheduled by try_charge() to be executed from the userland return path + * and reclaims memory over the high limit. + */ +void mem_cgroup_handle_over_high(void) +{ + unsigned int nr_pages = current->memcg_nr_pages_over_high; + struct mem_cgroup *memcg, *pos; + + if (likely(!nr_pages)) + return; + + pos = memcg = get_mem_cgroup_from_mm(current->mm); + + do { + if (page_counter_read(&pos->memory) <= pos->high) + continue; + mem_cgroup_events(pos, MEMCG_HIGH, 1); + try_to_free_mem_cgroup_pages(pos, nr_pages, GFP_KERNEL, true); + } while ((pos = parent_mem_cgroup(pos))); + + css_put(&memcg->css); + current->memcg_nr_pages_over_high = 0; +} + static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, unsigned int nr_pages) { @@ -1982,17 +2008,16 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, unsigned long nr_reclaimed; bool may_swap = true; bool drained = false; - int ret = 0; if (mem_cgroup_is_root(memcg)) - goto done; + return 0; retry: if (consume_stock(memcg, nr_pages)) - goto done; + return 0; if (!do_swap_account || - !page_counter_try_charge(&memcg->memsw, batch, &counter)) { - if (!page_counter_try_charge(&memcg->memory, batch, &counter)) + page_counter_try_charge(&memcg->memsw, batch, &counter)) { + if (page_counter_try_charge(&memcg->memory, batch, &counter)) goto done_restock; if (do_swap_account) page_counter_uncharge(&memcg->memsw, batch); @@ -2016,7 +2041,7 @@ retry: if (unlikely(test_thread_flag(TIF_MEMDIE) || fatal_signal_pending(current) || current->flags & PF_EXITING)) - goto bypass; + goto force; if (unlikely(task_in_memcg_oom(current))) goto nomem; @@ -2062,38 +2087,54 @@ retry: goto retry; if (gfp_mask & __GFP_NOFAIL) - goto bypass; + goto force; if (fatal_signal_pending(current)) - goto bypass; + goto force; mem_cgroup_events(mem_over_limit, MEMCG_OOM, 1); - mem_cgroup_oom(mem_over_limit, gfp_mask, get_order(nr_pages)); + mem_cgroup_oom(mem_over_limit, gfp_mask, + get_order(nr_pages * PAGE_SIZE)); nomem: if (!(gfp_mask & __GFP_NOFAIL)) return -ENOMEM; -bypass: - return -EINTR; +force: + /* + * The allocation either can't fail or will lead to more memory + * being freed very soon. Allow memory usage go over the limit + * temporarily by force charging it. + */ + page_counter_charge(&memcg->memory, nr_pages); + if (do_swap_account) + page_counter_charge(&memcg->memsw, nr_pages); + css_get_many(&memcg->css, nr_pages); + + return 0; done_restock: css_get_many(&memcg->css, batch); if (batch > nr_pages) refill_stock(memcg, batch - nr_pages); - if (!(gfp_mask & __GFP_WAIT)) - goto done; + /* - * If the hierarchy is above the normal consumption range, - * make the charging task trim their excess contribution. + * If the hierarchy is above the normal consumption range, schedule + * reclaim on returning to userland. We can perform reclaim here + * if __GFP_WAIT but let's always punt for simplicity and so that + * GFP_KERNEL can consistently be used during reclaim. @memcg is + * not recorded as it most likely matches current's and won't + * change in the meantime. As high limit is checked again before + * reclaim, the cost of mismatch is negligible. */ do { - if (page_counter_read(&memcg->memory) <= memcg->high) - continue; - mem_cgroup_events(memcg, MEMCG_HIGH, 1); - try_to_free_mem_cgroup_pages(memcg, nr_pages, gfp_mask, true); + if (page_counter_read(&memcg->memory) > memcg->high) { + current->memcg_nr_pages_over_high += nr_pages; + set_notify_resume(current); + break; + } } while ((memcg = parent_mem_cgroup(memcg))); -done: - return ret; + + return 0; } static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages) @@ -2174,55 +2215,6 @@ static void commit_charge(struct page *page, struct mem_cgroup *memcg, } #ifdef CONFIG_MEMCG_KMEM -int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, - unsigned long nr_pages) -{ - struct page_counter *counter; - int ret = 0; - - ret = page_counter_try_charge(&memcg->kmem, nr_pages, &counter); - if (ret < 0) - return ret; - - ret = try_charge(memcg, gfp, nr_pages); - if (ret == -EINTR) { - /* - * try_charge() chose to bypass to root due to OOM kill or - * fatal signal. Since our only options are to either fail - * the allocation or charge it to this cgroup, do it as a - * temporary condition. But we can't fail. From a kmem/slab - * perspective, the cache has already been selected, by - * mem_cgroup_kmem_get_cache(), so it is too late to change - * our minds. - * - * This condition will only trigger if the task entered - * memcg_charge_kmem in a sane state, but was OOM-killed - * during try_charge() above. Tasks that were already dying - * when the allocation triggers should have been already - * directed to the root cgroup in memcontrol.h - */ - page_counter_charge(&memcg->memory, nr_pages); - if (do_swap_account) - page_counter_charge(&memcg->memsw, nr_pages); - css_get_many(&memcg->css, nr_pages); - ret = 0; - } else if (ret) - page_counter_uncharge(&memcg->kmem, nr_pages); - - return ret; -} - -void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages) -{ - page_counter_uncharge(&memcg->memory, nr_pages); - if (do_swap_account) - page_counter_uncharge(&memcg->memsw, nr_pages); - - page_counter_uncharge(&memcg->kmem, nr_pages); - - css_put_many(&memcg->css, nr_pages); -} - static int memcg_alloc_cache_id(void) { int id, size; @@ -2384,85 +2376,58 @@ void __memcg_kmem_put_cache(struct kmem_cache *cachep) css_put(&cachep->memcg_params.memcg->css); } -/* - * We need to verify if the allocation against current->mm->owner's memcg is - * possible for the given order. But the page is not allocated yet, so we'll - * need a further commit step to do the final arrangements. - * - * It is possible for the task to switch cgroups in this mean time, so at - * commit time, we can't rely on task conversion any longer. We'll then use - * the handle argument to return to the caller which cgroup we should commit - * against. We could also return the memcg directly and avoid the pointer - * passing, but a boolean return value gives better semantics considering - * the compiled-out case as well. - * - * Returning true means the allocation is possible. - */ -bool -__memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **_memcg, int order) +int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, + struct mem_cgroup *memcg) { - struct mem_cgroup *memcg; + unsigned int nr_pages = 1 << order; + struct page_counter *counter; int ret; - *_memcg = NULL; + if (!memcg_kmem_is_active(memcg)) + return 0; - memcg = get_mem_cgroup_from_mm(current->mm); + if (!page_counter_try_charge(&memcg->kmem, nr_pages, &counter)) + return -ENOMEM; - if (!memcg_kmem_is_active(memcg)) { - css_put(&memcg->css); - return true; + ret = try_charge(memcg, gfp, nr_pages); + if (ret) { + page_counter_uncharge(&memcg->kmem, nr_pages); + return ret; } - ret = memcg_charge_kmem(memcg, gfp, 1 << order); - if (!ret) - *_memcg = memcg; + page->mem_cgroup = memcg; - css_put(&memcg->css); - return (ret == 0); + return 0; } -void __memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, - int order) +int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order) { - VM_BUG_ON(mem_cgroup_is_root(memcg)); + struct mem_cgroup *memcg; + int ret; - /* The page allocation failed. Revert */ - if (!page) { - memcg_uncharge_kmem(memcg, 1 << order); - return; - } - page->mem_cgroup = memcg; + memcg = get_mem_cgroup_from_mm(current->mm); + ret = __memcg_kmem_charge_memcg(page, gfp, order, memcg); + css_put(&memcg->css); + return ret; } -void __memcg_kmem_uncharge_pages(struct page *page, int order) +void __memcg_kmem_uncharge(struct page *page, int order) { struct mem_cgroup *memcg = page->mem_cgroup; + unsigned int nr_pages = 1 << order; if (!memcg) return; VM_BUG_ON_PAGE(mem_cgroup_is_root(memcg), page); - memcg_uncharge_kmem(memcg, 1 << order); - page->mem_cgroup = NULL; -} - -struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr) -{ - struct mem_cgroup *memcg = NULL; - struct kmem_cache *cachep; - struct page *page; - - page = virt_to_head_page(ptr); - if (PageSlab(page)) { - cachep = page->slab_cache; - if (!is_root_cache(cachep)) - memcg = cachep->memcg_params.memcg; - } else - /* page allocated by alloc_kmem_pages */ - memcg = page->mem_cgroup; + page_counter_uncharge(&memcg->kmem, nr_pages); + page_counter_uncharge(&memcg->memory, nr_pages); + if (do_swap_account) + page_counter_uncharge(&memcg->memsw, nr_pages); - return memcg; + page->mem_cgroup = NULL; + css_put_many(&memcg->css, nr_pages); } #endif /* CONFIG_MEMCG_KMEM */ @@ -2836,9 +2801,9 @@ static unsigned long tree_stat(struct mem_cgroup *memcg, return val; } -static inline u64 mem_cgroup_usage(struct mem_cgroup *memcg, bool swap) +static inline unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap) { - u64 val; + unsigned long val; if (mem_cgroup_is_root(memcg)) { val = tree_stat(memcg, MEM_CGROUP_STAT_CACHE); @@ -2851,7 +2816,7 @@ static inline u64 mem_cgroup_usage(struct mem_cgroup *memcg, bool swap) else val = page_counter_read(&memcg->memsw); } - return val << PAGE_SHIFT; + return val; } enum { @@ -2885,9 +2850,9 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css, switch (MEMFILE_ATTR(cft->private)) { case RES_USAGE: if (counter == &memcg->memory) - return mem_cgroup_usage(memcg, false); + return (u64)mem_cgroup_usage(memcg, false) * PAGE_SIZE; if (counter == &memcg->memsw) - return mem_cgroup_usage(memcg, true); + return (u64)mem_cgroup_usage(memcg, true) * PAGE_SIZE; return (u64)page_counter_read(counter) * PAGE_SIZE; case RES_LIMIT: return (u64)counter->limit * PAGE_SIZE; @@ -3387,7 +3352,6 @@ static int __mem_cgroup_usage_register_event(struct mem_cgroup *memcg, ret = page_counter_memparse(args, "-1", &threshold); if (ret) return ret; - threshold <<= PAGE_SHIFT; mutex_lock(&memcg->thresholds_lock); @@ -4406,22 +4370,10 @@ static int mem_cgroup_do_precharge(unsigned long count) mc.precharge += count; return ret; } - if (ret == -EINTR) { - cancel_charge(root_mem_cgroup, count); - return ret; - } /* Try charges one by one with reclaim */ while (count--) { ret = try_charge(mc.to, GFP_KERNEL & ~__GFP_NORETRY, 1); - /* - * In case of failure, any residual charges against - * mc.to will be dropped by mem_cgroup_clear_mc() - * later on. However, cancel any charges that are - * bypassed to root right away or they'll be lost. - */ - if (ret == -EINTR) - cancel_charge(root_mem_cgroup, 1); if (ret) return ret; mc.precharge++; @@ -4576,9 +4528,8 @@ static int mem_cgroup_move_account(struct page *page, goto out; /* - * Prevent mem_cgroup_migrate() from looking at page->mem_cgroup - * of its source page while we change it: page migration takes - * both pages off the LRU, but page cache replacement doesn't. + * Prevent mem_cgroup_replace_page() from looking at + * page->mem_cgroup of its source page while we change it. */ if (!trylock_page(page)) goto out; @@ -5085,7 +5036,9 @@ static void mem_cgroup_bind(struct cgroup_subsys_state *root_css) static u64 memory_current_read(struct cgroup_subsys_state *css, struct cftype *cft) { - return mem_cgroup_usage(mem_cgroup_from_css(css), false); + struct mem_cgroup *memcg = mem_cgroup_from_css(css); + + return (u64)page_counter_read(&memcg->memory) * PAGE_SIZE; } static int memory_low_show(struct seq_file *m, void *v) @@ -5197,6 +5150,7 @@ static int memory_events_show(struct seq_file *m, void *v) static struct cftype memory_files[] = { { .name = "current", + .flags = CFTYPE_NOT_ON_ROOT, .read_u64 = memory_current_read, }, { @@ -5340,11 +5294,6 @@ int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, ret = try_charge(memcg, gfp_mask, nr_pages); css_put(&memcg->css); - - if (ret == -EINTR) { - memcg = root_mem_cgroup; - ret = 0; - } out: *memcgp = memcg; return ret; @@ -5559,7 +5508,7 @@ void mem_cgroup_uncharge_list(struct list_head *page_list) } /** - * mem_cgroup_migrate - migrate a charge to another page + * mem_cgroup_replace_page - migrate a charge to another page * @oldpage: currently charged page * @newpage: page to transfer the charge to * @lrucare: either or both pages might be on the LRU already @@ -5568,16 +5517,13 @@ void mem_cgroup_uncharge_list(struct list_head *page_list) * * Both pages must be locked, @newpage->mapping must be set up. */ -void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, - bool lrucare) +void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage) { struct mem_cgroup *memcg; int isolated; VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage); VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); - VM_BUG_ON_PAGE(!lrucare && PageLRU(oldpage), oldpage); - VM_BUG_ON_PAGE(!lrucare && PageLRU(newpage), newpage); VM_BUG_ON_PAGE(PageAnon(oldpage) != PageAnon(newpage), newpage); VM_BUG_ON_PAGE(PageTransHuge(oldpage) != PageTransHuge(newpage), newpage); @@ -5589,25 +5535,16 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage, if (newpage->mem_cgroup) return; - /* - * Swapcache readahead pages can get migrated before being - * charged, and migration from compaction can happen to an - * uncharged page when the PFN walker finds a page that - * reclaim just put back on the LRU but has not released yet. - */ + /* Swapcache readahead pages can get replaced before being charged */ memcg = oldpage->mem_cgroup; if (!memcg) return; - if (lrucare) - lock_page_lru(oldpage, &isolated); - + lock_page_lru(oldpage, &isolated); oldpage->mem_cgroup = NULL; + unlock_page_lru(oldpage, isolated); - if (lrucare) - unlock_page_lru(oldpage, isolated); - - commit_charge(newpage, memcg, lrucare); + commit_charge(newpage, memcg, true); } /* diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 95882692e747..16a0ec385320 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -56,6 +56,7 @@ #include <linux/memory_hotplug.h> #include <linux/mm_inline.h> #include <linux/kfifo.h> +#include <linux/ratelimit.h> #include "internal.h" #include "ras/ras_event.h" @@ -1403,6 +1404,12 @@ static int __init memory_failure_init(void) } core_initcall(memory_failure_init); +#define unpoison_pr_info(fmt, pfn, rs) \ +({ \ + if (__ratelimit(rs)) \ + pr_info(fmt, pfn); \ +}) + /** * unpoison_memory - Unpoison a previously poisoned page * @pfn: Page number of the to be unpoisoned page @@ -1421,6 +1428,8 @@ int unpoison_memory(unsigned long pfn) struct page *p; int freeit = 0; unsigned int nr_pages; + static DEFINE_RATELIMIT_STATE(unpoison_rs, DEFAULT_RATELIMIT_INTERVAL, + DEFAULT_RATELIMIT_BURST); if (!pfn_valid(pfn)) return -ENXIO; @@ -1429,23 +1438,26 @@ int unpoison_memory(unsigned long pfn) page = compound_head(p); if (!PageHWPoison(p)) { - pr_info("MCE: Page was already unpoisoned %#lx\n", pfn); + unpoison_pr_info("MCE: Page was already unpoisoned %#lx\n", + pfn, &unpoison_rs); return 0; } if (page_count(page) > 1) { - pr_info("MCE: Someone grabs the hwpoison page %#lx\n", pfn); + unpoison_pr_info("MCE: Someone grabs the hwpoison page %#lx\n", + pfn, &unpoison_rs); return 0; } if (page_mapped(page)) { - pr_info("MCE: Someone maps the hwpoison page %#lx\n", pfn); + unpoison_pr_info("MCE: Someone maps the hwpoison page %#lx\n", + pfn, &unpoison_rs); return 0; } if (page_mapping(page)) { - pr_info("MCE: the hwpoison page has non-NULL mapping %#lx\n", - pfn); + unpoison_pr_info("MCE: the hwpoison page has non-NULL mapping %#lx\n", + pfn, &unpoison_rs); return 0; } @@ -1455,7 +1467,8 @@ int unpoison_memory(unsigned long pfn) * In such case, we yield to memory_failure() and make unpoison fail. */ if (!PageHuge(page) && PageTransHuge(page)) { - pr_info("MCE: Memory failure is now running on %#lx\n", pfn); + unpoison_pr_info("MCE: Memory failure is now running on %#lx\n", + pfn, &unpoison_rs); return 0; } @@ -1469,12 +1482,14 @@ int unpoison_memory(unsigned long pfn) * to the end. */ if (PageHuge(page)) { - pr_info("MCE: Memory failure is now running on free hugepage %#lx\n", pfn); + unpoison_pr_info("MCE: Memory failure is now running on free hugepage %#lx\n", + pfn, &unpoison_rs); return 0; } if (TestClearPageHWPoison(p)) num_poisoned_pages_dec(); - pr_info("MCE: Software-unpoisoned free page %#lx\n", pfn); + unpoison_pr_info("MCE: Software-unpoisoned free page %#lx\n", + pfn, &unpoison_rs); return 0; } @@ -1486,7 +1501,8 @@ int unpoison_memory(unsigned long pfn) * the free buddy page pool. */ if (TestClearPageHWPoison(page)) { - pr_info("MCE: Software-unpoisoned page %#lx\n", pfn); + unpoison_pr_info("MCE: Software-unpoisoned page %#lx\n", + pfn, &unpoison_rs); num_poisoned_pages_sub(nr_pages); freeit = 1; if (PageHuge(page)) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 0780d118d26e..67d488ab495e 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -339,8 +339,8 @@ static int __ref ensure_zone_is_initialized(struct zone *zone, unsigned long start_pfn, unsigned long num_pages) { if (!zone_is_initialized(zone)) - return init_currently_empty_zone(zone, start_pfn, num_pages, - MEMMAP_HOTPLUG); + return init_currently_empty_zone(zone, start_pfn, num_pages); + return 0; } diff --git a/mm/migrate.c b/mm/migrate.c index 842ecd7aaf7f..2834faba719a 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1,5 +1,5 @@ /* - * Memory Migration functionality - linux/mm/migration.c + * Memory Migration functionality - linux/mm/migrate.c * * Copyright (C) 2006 Silicon Graphics, Inc., Christoph Lameter * @@ -30,7 +30,7 @@ #include <linux/mempolicy.h> #include <linux/vmalloc.h> #include <linux/security.h> -#include <linux/memcontrol.h> +#include <linux/backing-dev.h> #include <linux/syscalls.h> #include <linux/hugetlb.h> #include <linux/hugetlb_cgroup.h> @@ -171,6 +171,9 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma, else page_add_file_rmap(new); + if (vma->vm_flags & VM_LOCKED) + mlock_vma_page(new); + /* No need to invalidate - it was non-present before */ update_mmu_cache(vma, addr, ptep); unlock: @@ -311,6 +314,8 @@ int migrate_page_move_mapping(struct address_space *mapping, struct buffer_head *head, enum migrate_mode mode, int extra_count) { + struct zone *oldzone, *newzone; + int dirty; int expected_count = 1 + extra_count; void **pslot; @@ -318,9 +323,20 @@ int migrate_page_move_mapping(struct address_space *mapping, /* Anonymous page without mapping */ if (page_count(page) != expected_count) return -EAGAIN; + + /* No turning back from here */ + set_page_memcg(newpage, page_memcg(page)); + newpage->index = page->index; + newpage->mapping = page->mapping; + if (PageSwapBacked(page)) + SetPageSwapBacked(newpage); + return MIGRATEPAGE_SUCCESS; } + oldzone = page_zone(page); + newzone = page_zone(newpage); + spin_lock_irq(&mapping->tree_lock); pslot = radix_tree_lookup_slot(&mapping->page_tree, @@ -353,14 +369,28 @@ int migrate_page_move_mapping(struct address_space *mapping, } /* - * Now we know that no one else is looking at the page. + * Now we know that no one else is looking at the page: + * no turning back from here. */ + set_page_memcg(newpage, page_memcg(page)); + newpage->index = page->index; + newpage->mapping = page->mapping; + if (PageSwapBacked(page)) + SetPageSwapBacked(newpage); + get_page(newpage); /* add cache reference */ if (PageSwapCache(page)) { SetPageSwapCache(newpage); set_page_private(newpage, page_private(page)); } + /* Move dirty while page refs frozen and newpage not yet exposed */ + dirty = PageDirty(page); + if (dirty) { + ClearPageDirty(page); + SetPageDirty(newpage); + } + radix_tree_replace_slot(pslot, newpage); /* @@ -370,6 +400,9 @@ int migrate_page_move_mapping(struct address_space *mapping, */ page_unfreeze_refs(page, expected_count - 1); + spin_unlock(&mapping->tree_lock); + /* Leave irq disabled to prevent preemption while updating stats */ + /* * If moved to a different zone then also account * the page for that zone. Other VM counters will be @@ -380,13 +413,19 @@ int migrate_page_move_mapping(struct address_space *mapping, * via NR_FILE_PAGES and NR_ANON_PAGES if they * are mapped to swap space. */ - __dec_zone_page_state(page, NR_FILE_PAGES); - __inc_zone_page_state(newpage, NR_FILE_PAGES); - if (!PageSwapCache(page) && PageSwapBacked(page)) { - __dec_zone_page_state(page, NR_SHMEM); - __inc_zone_page_state(newpage, NR_SHMEM); + if (newzone != oldzone) { + __dec_zone_state(oldzone, NR_FILE_PAGES); + __inc_zone_state(newzone, NR_FILE_PAGES); + if (PageSwapBacked(page) && !PageSwapCache(page)) { + __dec_zone_state(oldzone, NR_SHMEM); + __inc_zone_state(newzone, NR_SHMEM); + } + if (dirty && mapping_cap_account_dirty(mapping)) { + __dec_zone_state(oldzone, NR_FILE_DIRTY); + __inc_zone_state(newzone, NR_FILE_DIRTY); + } } - spin_unlock_irq(&mapping->tree_lock); + local_irq_enable(); return MIGRATEPAGE_SUCCESS; } @@ -401,12 +440,6 @@ int migrate_huge_page_move_mapping(struct address_space *mapping, int expected_count; void **pslot; - if (!mapping) { - if (page_count(page) != 1) - return -EAGAIN; - return MIGRATEPAGE_SUCCESS; - } - spin_lock_irq(&mapping->tree_lock); pslot = radix_tree_lookup_slot(&mapping->page_tree, @@ -424,6 +457,9 @@ int migrate_huge_page_move_mapping(struct address_space *mapping, return -EAGAIN; } + set_page_memcg(newpage, page_memcg(page)); + newpage->index = page->index; + newpage->mapping = page->mapping; get_page(newpage); radix_tree_replace_slot(pslot, newpage); @@ -510,20 +546,9 @@ void migrate_page_copy(struct page *newpage, struct page *page) if (PageMappedToDisk(page)) SetPageMappedToDisk(newpage); - if (PageDirty(page)) { - clear_page_dirty_for_io(page); - /* - * Want to mark the page and the radix tree as dirty, and - * redo the accounting that clear_page_dirty_for_io undid, - * but we can't use set_page_dirty because that function - * is actually a signal that all of the page has become dirty. - * Whereas only part of our page may be dirty. - */ - if (PageSwapBacked(page)) - SetPageDirty(newpage); - else - __set_page_dirty_nobuffers(newpage); - } + /* Move dirty on pages not done by migrate_page_move_mapping() */ + if (PageDirty(page)) + SetPageDirty(newpage); if (page_is_young(page)) set_page_young(newpage); @@ -537,7 +562,6 @@ void migrate_page_copy(struct page *newpage, struct page *page) cpupid = page_cpupid_xchg_last(page, -1); page_cpupid_xchg_last(newpage, cpupid); - mlock_migrate_page(newpage, page); ksm_migrate_page(newpage, page); /* * Please do not reorder this without considering how mm/ksm.c's @@ -721,33 +745,13 @@ static int fallback_migrate_page(struct address_space *mapping, * MIGRATEPAGE_SUCCESS - success */ static int move_to_new_page(struct page *newpage, struct page *page, - int page_was_mapped, enum migrate_mode mode) + enum migrate_mode mode) { struct address_space *mapping; int rc; - /* - * Block others from accessing the page when we get around to - * establishing additional references. We are the only one - * holding a reference to the new page at this point. - */ - if (!trylock_page(newpage)) - BUG(); - - /* Prepare mapping for the new page.*/ - newpage->index = page->index; - newpage->mapping = page->mapping; - if (PageSwapBacked(page)) - SetPageSwapBacked(newpage); - - /* - * Indirectly called below, migrate_page_copy() copies PG_dirty and thus - * needs newpage's memcg set to transfer memcg dirty page accounting. - * So perform memcg migration in two steps: - * 1. set newpage->mem_cgroup (here) - * 2. clear page->mem_cgroup (below) - */ - set_page_memcg(newpage, page_memcg(page)); + VM_BUG_ON_PAGE(!PageLocked(page), page); + VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); mapping = page_mapping(page); if (!mapping) @@ -759,23 +763,19 @@ static int move_to_new_page(struct page *newpage, struct page *page, * space which also has its own migratepage callback. This * is the most common path for page migration. */ - rc = mapping->a_ops->migratepage(mapping, - newpage, page, mode); + rc = mapping->a_ops->migratepage(mapping, newpage, page, mode); else rc = fallback_migrate_page(mapping, newpage, page, mode); - if (rc != MIGRATEPAGE_SUCCESS) { - set_page_memcg(newpage, NULL); - newpage->mapping = NULL; - } else { + /* + * When successful, old pagecache page->mapping must be cleared before + * page is freed; but stats require that PageAnon be left as PageAnon. + */ + if (rc == MIGRATEPAGE_SUCCESS) { set_page_memcg(page, NULL); - if (page_was_mapped) - remove_migration_ptes(page, newpage); - page->mapping = NULL; + if (!PageAnon(page)) + page->mapping = NULL; } - - unlock_page(newpage); - return rc; } @@ -824,6 +824,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage, goto out_unlock; wait_on_page_writeback(page); } + /* * By try_to_unmap(), page->mapcount goes down to 0 here. In this case, * we cannot notice that anon_vma is freed while we migrates a page. @@ -831,34 +832,26 @@ static int __unmap_and_move(struct page *page, struct page *newpage, * of migration. File cache pages are no problem because of page_lock() * File Caches may use write_page() or lock_page() in migration, then, * just care Anon page here. + * + * Only page_get_anon_vma() understands the subtleties of + * getting a hold on an anon_vma from outside one of its mms. + * But if we cannot get anon_vma, then we won't need it anyway, + * because that implies that the anon page is no longer mapped + * (and cannot be remapped so long as we hold the page lock). */ - if (PageAnon(page) && !PageKsm(page)) { - /* - * Only page_lock_anon_vma_read() understands the subtleties of - * getting a hold on an anon_vma from outside one of its mms. - */ + if (PageAnon(page) && !PageKsm(page)) anon_vma = page_get_anon_vma(page); - if (anon_vma) { - /* - * Anon page - */ - } else if (PageSwapCache(page)) { - /* - * We cannot be sure that the anon_vma of an unmapped - * swapcache page is safe to use because we don't - * know in advance if the VMA that this page belonged - * to still exists. If the VMA and others sharing the - * data have been freed, then the anon_vma could - * already be invalid. - * - * To avoid this possibility, swapcache pages get - * migrated but are not remapped when migration - * completes - */ - } else { - goto out_unlock; - } - } + + /* + * Block others from accessing the new page when we get around to + * establishing additional references. We are usually the only one + * holding a reference to newpage at this point. We used to have a BUG + * here if trylock_page(newpage) fails, but would like to allow for + * cases where there might be a race with the previous use of newpage. + * This is much like races on refcount of oldpage: just don't BUG(). + */ + if (unlikely(!trylock_page(newpage))) + goto out_unlock; if (unlikely(isolated_balloon_page(page))) { /* @@ -869,7 +862,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage, * the page migration right away (proteced by page lock). */ rc = balloon_page_migrate(newpage, page, mode); - goto out_unlock; + goto out_unlock_both; } /* @@ -888,30 +881,30 @@ static int __unmap_and_move(struct page *page, struct page *newpage, VM_BUG_ON_PAGE(PageAnon(page), page); if (page_has_private(page)) { try_to_free_buffers(page); - goto out_unlock; + goto out_unlock_both; } - goto skip_unmap; - } - - /* Establish migration ptes or remove ptes */ - if (page_mapped(page)) { + } else if (page_mapped(page)) { + /* Establish migration ptes */ + VM_BUG_ON_PAGE(PageAnon(page) && !PageKsm(page) && !anon_vma, + page); try_to_unmap(page, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); page_was_mapped = 1; } -skip_unmap: if (!page_mapped(page)) - rc = move_to_new_page(newpage, page, page_was_mapped, mode); + rc = move_to_new_page(newpage, page, mode); - if (rc && page_was_mapped) - remove_migration_ptes(page, page); + if (page_was_mapped) + remove_migration_ptes(page, + rc == MIGRATEPAGE_SUCCESS ? newpage : page); +out_unlock_both: + unlock_page(newpage); +out_unlock: /* Drop an anon_vma reference if we took one */ if (anon_vma) put_anon_vma(anon_vma); - -out_unlock: unlock_page(page); out: return rc; @@ -937,10 +930,11 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page, int force, enum migrate_mode mode, enum migrate_reason reason) { - int rc = 0; + int rc = MIGRATEPAGE_SUCCESS; int *result = NULL; - struct page *newpage = get_new_page(page, private, &result); + struct page *newpage; + newpage = get_new_page(page, private, &result); if (!newpage) return -ENOMEM; @@ -954,6 +948,8 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page, goto out; rc = __unmap_and_move(page, newpage, force, mode); + if (rc == MIGRATEPAGE_SUCCESS) + put_new_page = NULL; out: if (rc != -EAGAIN) { @@ -980,10 +976,9 @@ out: * it. Otherwise, putback_lru_page() will drop the reference grabbed * during isolation. */ - if (rc != MIGRATEPAGE_SUCCESS && put_new_page) { - ClearPageSwapBacked(newpage); + if (put_new_page) put_new_page(newpage, private); - } else if (unlikely(__is_movable_balloon_page(newpage))) { + else if (unlikely(__is_movable_balloon_page(newpage))) { /* drop our reference, page already in the balloon */ put_page(newpage); } else @@ -1021,7 +1016,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page, struct page *hpage, int force, enum migrate_mode mode) { - int rc = 0; + int rc = -EAGAIN; int *result = NULL; int page_was_mapped = 0; struct page *new_hpage; @@ -1043,8 +1038,6 @@ static int unmap_and_move_huge_page(new_page_t get_new_page, if (!new_hpage) return -ENOMEM; - rc = -EAGAIN; - if (!trylock_page(hpage)) { if (!force || mode != MIGRATE_SYNC) goto out; @@ -1054,6 +1047,9 @@ static int unmap_and_move_huge_page(new_page_t get_new_page, if (PageAnon(hpage)) anon_vma = page_get_anon_vma(hpage); + if (unlikely(!trylock_page(new_hpage))) + goto put_anon; + if (page_mapped(hpage)) { try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); @@ -1061,16 +1057,22 @@ static int unmap_and_move_huge_page(new_page_t get_new_page, } if (!page_mapped(hpage)) - rc = move_to_new_page(new_hpage, hpage, page_was_mapped, mode); + rc = move_to_new_page(new_hpage, hpage, mode); + + if (page_was_mapped) + remove_migration_ptes(hpage, + rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage); - if (rc != MIGRATEPAGE_SUCCESS && page_was_mapped) - remove_migration_ptes(hpage, hpage); + unlock_page(new_hpage); +put_anon: if (anon_vma) put_anon_vma(anon_vma); - if (rc == MIGRATEPAGE_SUCCESS) + if (rc == MIGRATEPAGE_SUCCESS) { hugetlb_cgroup_migrate(hpage, new_hpage); + put_new_page = NULL; + } unlock_page(hpage); out: @@ -1082,7 +1084,7 @@ out: * it. Otherwise, put_page() will drop the reference grabbed during * isolation. */ - if (rc != MIGRATEPAGE_SUCCESS && put_new_page) + if (put_new_page) put_new_page(new_hpage, private); else putback_active_hugepage(new_hpage); @@ -1112,7 +1114,7 @@ out: * * The function returns after 10 attempts or if no pages are movable any more * because the list has become empty or no retryable pages exist any more. - * The caller should call putback_lru_pages() to return pages to the LRU + * The caller should call putback_movable_pages() to return pages to the LRU * or free list only if ret != 0. * * Returns the number of pages that were not migrated, or an error code. @@ -1169,7 +1171,8 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page, } } } - rc = nr_failed + retry; + nr_failed += retry; + rc = nr_failed; out: if (nr_succeeded) count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded); @@ -1786,7 +1789,6 @@ fail_putback: SetPageActive(page); if (TestClearPageUnevictable(new_page)) SetPageUnevictable(page); - mlock_migrate_page(page, new_page); unlock_page(new_page); put_page(new_page); /* Free it */ @@ -1828,8 +1830,9 @@ fail_putback: goto fail_putback; } - mem_cgroup_migrate(page, new_page, false); - + mlock_migrate_page(new_page, page); + set_page_memcg(new_page, page_memcg(page)); + set_page_memcg(page, NULL); page_remove_rmap(page); spin_unlock(ptl); diff --git a/mm/mincore.c b/mm/mincore.c index be25efde64a4..14bb9fb37f0c 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -234,7 +234,7 @@ SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len, /* This also avoids any overflows on PAGE_CACHE_ALIGN */ pages = len >> PAGE_SHIFT; - pages += (len & ~PAGE_MASK) != 0; + pages += (offset_in_page(len)) != 0; if (!access_ok(VERIFY_WRITE, vec, pages)) return -EFAULT; diff --git a/mm/mlock.c b/mm/mlock.c index 25936680064f..339d9e0949b6 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -422,7 +422,7 @@ static unsigned long __munlock_pagevec_fill(struct pagevec *pvec, void munlock_vma_pages_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { - vma->vm_flags &= ~VM_LOCKED; + vma->vm_flags &= VM_LOCKED_CLEAR_MASK; while (start < end) { struct page *page = NULL; @@ -506,7 +506,8 @@ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev, if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) || is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm)) - goto out; /* don't set VM_LOCKED, don't count */ + /* don't set VM_LOCKED or VM_LOCKONFAULT and don't count */ + goto out; pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); *prev = vma_merge(mm, *prev, start, end, newflags, vma->anon_vma, @@ -554,13 +555,14 @@ out: return ret; } -static int do_mlock(unsigned long start, size_t len, int on) +static int apply_vma_lock_flags(unsigned long start, size_t len, + vm_flags_t flags) { unsigned long nstart, end, tmp; struct vm_area_struct * vma, * prev; int error; - VM_BUG_ON(start & ~PAGE_MASK); + VM_BUG_ON(offset_in_page(start)); VM_BUG_ON(len != PAGE_ALIGN(len)); end = start + len; if (end < start) @@ -576,14 +578,11 @@ static int do_mlock(unsigned long start, size_t len, int on) prev = vma; for (nstart = start ; ; ) { - vm_flags_t newflags; + vm_flags_t newflags = vma->vm_flags & VM_LOCKED_CLEAR_MASK; - /* Here we know that vma->vm_start <= nstart < vma->vm_end. */ - - newflags = vma->vm_flags & ~VM_LOCKED; - if (on) - newflags |= VM_LOCKED; + newflags |= flags; + /* Here we know that vma->vm_start <= nstart < vma->vm_end. */ tmp = vma->vm_end; if (tmp > end) tmp = end; @@ -605,7 +604,7 @@ static int do_mlock(unsigned long start, size_t len, int on) return error; } -SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) +static int do_mlock(unsigned long start, size_t len, vm_flags_t flags) { unsigned long locked; unsigned long lock_limit; @@ -616,7 +615,7 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) lru_add_drain_all(); /* flush pagevec */ - len = PAGE_ALIGN(len + (start & ~PAGE_MASK)); + len = PAGE_ALIGN(len + (offset_in_page(start))); start &= PAGE_MASK; lock_limit = rlimit(RLIMIT_MEMLOCK); @@ -629,7 +628,7 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) /* check against resource limits */ if ((locked <= lock_limit) || capable(CAP_IPC_LOCK)) - error = do_mlock(start, len, 1); + error = apply_vma_lock_flags(start, len, flags); up_write(¤t->mm->mmap_sem); if (error) @@ -641,37 +640,75 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) return 0; } +SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) +{ + return do_mlock(start, len, VM_LOCKED); +} + +SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags) +{ + vm_flags_t vm_flags = VM_LOCKED; + + if (flags & ~MLOCK_ONFAULT) + return -EINVAL; + + if (flags & MLOCK_ONFAULT) + vm_flags |= VM_LOCKONFAULT; + + return do_mlock(start, len, vm_flags); +} + SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) { int ret; - len = PAGE_ALIGN(len + (start & ~PAGE_MASK)); + len = PAGE_ALIGN(len + (offset_in_page(start))); start &= PAGE_MASK; down_write(¤t->mm->mmap_sem); - ret = do_mlock(start, len, 0); + ret = apply_vma_lock_flags(start, len, 0); up_write(¤t->mm->mmap_sem); return ret; } -static int do_mlockall(int flags) +/* + * Take the MCL_* flags passed into mlockall (or 0 if called from munlockall) + * and translate into the appropriate modifications to mm->def_flags and/or the + * flags for all current VMAs. + * + * There are a couple of subtleties with this. If mlockall() is called multiple + * times with different flags, the values do not necessarily stack. If mlockall + * is called once including the MCL_FUTURE flag and then a second time without + * it, VM_LOCKED and VM_LOCKONFAULT will be cleared from mm->def_flags. + */ +static int apply_mlockall_flags(int flags) { struct vm_area_struct * vma, * prev = NULL; + vm_flags_t to_add = 0; - if (flags & MCL_FUTURE) + current->mm->def_flags &= VM_LOCKED_CLEAR_MASK; + if (flags & MCL_FUTURE) { current->mm->def_flags |= VM_LOCKED; - else - current->mm->def_flags &= ~VM_LOCKED; - if (flags == MCL_FUTURE) - goto out; + + if (flags & MCL_ONFAULT) + current->mm->def_flags |= VM_LOCKONFAULT; + + if (!(flags & MCL_CURRENT)) + goto out; + } + + if (flags & MCL_CURRENT) { + to_add |= VM_LOCKED; + if (flags & MCL_ONFAULT) + to_add |= VM_LOCKONFAULT; + } for (vma = current->mm->mmap; vma ; vma = prev->vm_next) { vm_flags_t newflags; - newflags = vma->vm_flags & ~VM_LOCKED; - if (flags & MCL_CURRENT) - newflags |= VM_LOCKED; + newflags = vma->vm_flags & VM_LOCKED_CLEAR_MASK; + newflags |= to_add; /* Ignore errors */ mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags); @@ -684,14 +721,13 @@ out: SYSCALL_DEFINE1(mlockall, int, flags) { unsigned long lock_limit; - int ret = -EINVAL; + int ret; - if (!flags || (flags & ~(MCL_CURRENT | MCL_FUTURE))) - goto out; + if (!flags || (flags & ~(MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT))) + return -EINVAL; - ret = -EPERM; if (!can_do_mlock()) - goto out; + return -EPERM; if (flags & MCL_CURRENT) lru_add_drain_all(); /* flush pagevec */ @@ -704,11 +740,11 @@ SYSCALL_DEFINE1(mlockall, int, flags) if (!(flags & MCL_CURRENT) || (current->mm->total_vm <= lock_limit) || capable(CAP_IPC_LOCK)) - ret = do_mlockall(flags); + ret = apply_mlockall_flags(flags); up_write(¤t->mm->mmap_sem); if (!ret && (flags & MCL_CURRENT)) mm_populate(0, TASK_SIZE); -out: + return ret; } @@ -717,7 +753,7 @@ SYSCALL_DEFINE0(munlockall) int ret; down_write(¤t->mm->mmap_sem); - ret = do_mlockall(0); + ret = apply_mlockall_flags(0); up_write(¤t->mm->mmap_sem); return ret; } diff --git a/mm/mmap.c b/mm/mmap.c index 79bcc9f92e48..2ce04a649f6b 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1302,7 +1302,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr, * that it represents a valid section of the address space. */ addr = get_unmapped_area(file, addr, len, pgoff, flags); - if (addr & ~PAGE_MASK) + if (offset_in_page(addr)) return addr; /* Do simple checking here so the lower-level routines won't have @@ -1412,13 +1412,13 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, unsigned long, fd, unsigned long, pgoff) { struct file *file = NULL; - unsigned long retval = -EBADF; + unsigned long retval; if (!(flags & MAP_ANONYMOUS)) { audit_mmap_fd(fd, flags); file = fget(fd); if (!file) - goto out; + return -EBADF; if (is_file_hugepages(file)) len = ALIGN(len, huge_page_size(hstate_file(file))); retval = -EINVAL; @@ -1453,7 +1453,6 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, out_fput: if (file) fput(file); -out: return retval; } @@ -1473,7 +1472,7 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; - if (a.offset & ~PAGE_MASK) + if (offset_in_page(a.offset)) return -EINVAL; return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, @@ -1562,7 +1561,6 @@ unsigned long mmap_region(struct file *file, unsigned long addr, } /* Clear old maps */ - error = -ENOMEM; while (find_vma_links(mm, addr, addr + len, &prev, &rb_link, &rb_parent)) { if (do_munmap(mm, addr, len)) @@ -1663,7 +1661,7 @@ out: vma == get_gate_vma(current->mm))) mm->locked_vm += (len >> PAGE_SHIFT); else - vma->vm_flags &= ~VM_LOCKED; + vma->vm_flags &= VM_LOCKED_CLEAR_MASK; } if (file) @@ -1989,7 +1987,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, * can happen with large stack limits and large mmap() * allocations. */ - if (addr & ~PAGE_MASK) { + if (offset_in_page(addr)) { VM_BUG_ON(addr != -ENOMEM); info.flags = 0; info.low_limit = TASK_UNMAPPED_BASE; @@ -2025,7 +2023,7 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, if (addr > TASK_SIZE - len) return -ENOMEM; - if (addr & ~PAGE_MASK) + if (offset_in_page(addr)) return -EINVAL; addr = arch_rebalance_pgtables(addr, len); @@ -2047,7 +2045,6 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) return vma; rb_node = mm->mm_rb.rb_node; - vma = NULL; while (rb_node) { struct vm_area_struct *tmp; @@ -2139,10 +2136,6 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns if (security_vm_enough_memory_mm(mm, grow)) return -ENOMEM; - /* Ok, everything looks good - let it rip */ - if (vma->vm_flags & VM_LOCKED) - mm->locked_vm += grow; - vm_stat_account(mm, vma->vm_flags, vma->vm_file, grow); return 0; } @@ -2153,6 +2146,7 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns */ int expand_upwards(struct vm_area_struct *vma, unsigned long address) { + struct mm_struct *mm = vma->vm_mm; int error; if (!(vma->vm_flags & VM_GROWSUP)) @@ -2202,15 +2196,19 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) * So, we reuse mm->page_table_lock to guard * against concurrent vma expansions. */ - spin_lock(&vma->vm_mm->page_table_lock); + spin_lock(&mm->page_table_lock); + if (vma->vm_flags & VM_LOCKED) + mm->locked_vm += grow; + vm_stat_account(mm, vma->vm_flags, + vma->vm_file, grow); anon_vma_interval_tree_pre_update_vma(vma); vma->vm_end = address; anon_vma_interval_tree_post_update_vma(vma); if (vma->vm_next) vma_gap_update(vma->vm_next); else - vma->vm_mm->highest_vm_end = address; - spin_unlock(&vma->vm_mm->page_table_lock); + mm->highest_vm_end = address; + spin_unlock(&mm->page_table_lock); perf_event_mmap(vma); } @@ -2218,7 +2216,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) } vma_unlock_anon_vma(vma); khugepaged_enter_vma_merge(vma, vma->vm_flags); - validate_mm(vma->vm_mm); + validate_mm(mm); return error; } #endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */ @@ -2229,6 +2227,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) int expand_downwards(struct vm_area_struct *vma, unsigned long address) { + struct mm_struct *mm = vma->vm_mm; int error; /* @@ -2273,13 +2272,17 @@ int expand_downwards(struct vm_area_struct *vma, * So, we reuse mm->page_table_lock to guard * against concurrent vma expansions. */ - spin_lock(&vma->vm_mm->page_table_lock); + spin_lock(&mm->page_table_lock); + if (vma->vm_flags & VM_LOCKED) + mm->locked_vm += grow; + vm_stat_account(mm, vma->vm_flags, + vma->vm_file, grow); anon_vma_interval_tree_pre_update_vma(vma); vma->vm_start = address; vma->vm_pgoff -= grow; anon_vma_interval_tree_post_update_vma(vma); vma_gap_update(vma); - spin_unlock(&vma->vm_mm->page_table_lock); + spin_unlock(&mm->page_table_lock); perf_event_mmap(vma); } @@ -2287,7 +2290,7 @@ int expand_downwards(struct vm_area_struct *vma, } vma_unlock_anon_vma(vma); khugepaged_enter_vma_merge(vma, vma->vm_flags); - validate_mm(vma->vm_mm); + validate_mm(mm); return error; } @@ -2536,7 +2539,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) unsigned long end; struct vm_area_struct *vma, *prev, *last; - if ((start & ~PAGE_MASK) || start > TASK_SIZE || len > TASK_SIZE-start) + if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start) return -EINVAL; len = PAGE_ALIGN(len); @@ -2734,7 +2737,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len) flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags; error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED); - if (error & ~PAGE_MASK) + if (offset_in_page(error)) return error; error = mlock_future_check(mm, mm->def_flags, len); @@ -3049,8 +3052,8 @@ static int special_mapping_fault(struct vm_area_struct *vma, static struct vm_area_struct *__install_special_mapping( struct mm_struct *mm, unsigned long addr, unsigned long len, - unsigned long vm_flags, const struct vm_operations_struct *ops, - void *priv) + unsigned long vm_flags, void *priv, + const struct vm_operations_struct *ops) { int ret; struct vm_area_struct *vma; @@ -3099,8 +3102,8 @@ struct vm_area_struct *_install_special_mapping( unsigned long addr, unsigned long len, unsigned long vm_flags, const struct vm_special_mapping *spec) { - return __install_special_mapping(mm, addr, len, vm_flags, - &special_mapping_vmops, (void *)spec); + return __install_special_mapping(mm, addr, len, vm_flags, (void *)spec, + &special_mapping_vmops); } int install_special_mapping(struct mm_struct *mm, @@ -3108,8 +3111,8 @@ int install_special_mapping(struct mm_struct *mm, unsigned long vm_flags, struct page **pages) { struct vm_area_struct *vma = __install_special_mapping( - mm, addr, len, vm_flags, &legacy_special_mapping_vmops, - (void *)pages); + mm, addr, len, vm_flags, (void *)pages, + &legacy_special_mapping_vmops); return PTR_ERR_OR_ZERO(vma); } diff --git a/mm/mremap.c b/mm/mremap.c index 5a71cce8c6ea..c25bc6268e46 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -401,7 +401,7 @@ static unsigned long mremap_to(unsigned long addr, unsigned long old_len, unsigned long charged = 0; unsigned long map_flags; - if (new_addr & ~PAGE_MASK) + if (offset_in_page(new_addr)) goto out; if (new_len > TASK_SIZE || new_addr > TASK_SIZE - new_len) @@ -435,11 +435,11 @@ static unsigned long mremap_to(unsigned long addr, unsigned long old_len, ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); - if (ret & ~PAGE_MASK) + if (offset_in_page(ret)) goto out1; ret = move_vma(vma, addr, old_len, new_len, new_addr, locked); - if (!(ret & ~PAGE_MASK)) + if (!(offset_in_page(ret))) goto out; out1: vm_unacct_memory(charged); @@ -484,7 +484,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, if (flags & MREMAP_FIXED && !(flags & MREMAP_MAYMOVE)) return ret; - if (addr & ~PAGE_MASK) + if (offset_in_page(addr)) return ret; old_len = PAGE_ALIGN(old_len); @@ -566,7 +566,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); - if (new_addr & ~PAGE_MASK) { + if (offset_in_page(new_addr)) { ret = new_addr; goto out; } @@ -574,7 +574,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, ret = move_vma(vma, addr, old_len, new_len, new_addr, &locked); } out: - if (ret & ~PAGE_MASK) { + if (offset_in_page(ret)) { vm_unacct_memory(charged); locked = 0; } diff --git a/mm/msync.c b/mm/msync.c index bb04d53ae852..24e612fefa04 100644 --- a/mm/msync.c +++ b/mm/msync.c @@ -38,7 +38,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags) if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC)) goto out; - if (start & ~PAGE_MASK) + if (offset_in_page(start)) goto out; if ((flags & MS_ASYNC) && (flags & MS_SYNC)) goto out; diff --git a/mm/nommu.c b/mm/nommu.c index ab14a2014dea..92be862c859b 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -578,16 +578,16 @@ static noinline void validate_nommu_regions(void) return; last = rb_entry(lastp, struct vm_region, vm_rb); - BUG_ON(unlikely(last->vm_end <= last->vm_start)); - BUG_ON(unlikely(last->vm_top < last->vm_end)); + BUG_ON(last->vm_end <= last->vm_start); + BUG_ON(last->vm_top < last->vm_end); while ((p = rb_next(lastp))) { region = rb_entry(p, struct vm_region, vm_rb); last = rb_entry(lastp, struct vm_region, vm_rb); - BUG_ON(unlikely(region->vm_end <= region->vm_start)); - BUG_ON(unlikely(region->vm_top < region->vm_end)); - BUG_ON(unlikely(region->vm_start < last->vm_top)); + BUG_ON(region->vm_end <= region->vm_start); + BUG_ON(region->vm_top < region->vm_end); + BUG_ON(region->vm_start < last->vm_top); lastp = p; } @@ -1497,7 +1497,7 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; - if (a.offset & ~PAGE_MASK) + if (offset_in_page(a.offset)) return -EINVAL; return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, @@ -1653,9 +1653,9 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) goto erase_whole_vma; if (start < vma->vm_start || end > vma->vm_end) return -EINVAL; - if (start & ~PAGE_MASK) + if (offset_in_page(start)) return -EINVAL; - if (end != vma->vm_end && end & ~PAGE_MASK) + if (end != vma->vm_end && offset_in_page(end)) return -EINVAL; if (start != vma->vm_start && end != vma->vm_end) { ret = split_vma(mm, vma, start, 1); @@ -1736,7 +1736,7 @@ static unsigned long do_mremap(unsigned long addr, if (old_len == 0 || new_len == 0) return (unsigned long) -EINVAL; - if (addr & ~PAGE_MASK) + if (offset_in_page(addr)) return -EINVAL; if (flags & MREMAP_FIXED && new_addr != addr) diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 1ecc0bcaecc5..e4778285d8d1 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -377,13 +377,11 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask) static void dump_header(struct oom_control *oc, struct task_struct *p, struct mem_cgroup *memcg) { - task_lock(current); pr_warning("%s invoked oom-killer: gfp_mask=0x%x, order=%d, " "oom_score_adj=%hd\n", current->comm, oc->gfp_mask, oc->order, current->signal->oom_score_adj); - cpuset_print_task_mems_allowed(current); - task_unlock(current); + cpuset_print_current_mems_allowed(); dump_stack(); if (memcg) mem_cgroup_print_oom_info(memcg, p); @@ -476,6 +474,24 @@ void oom_killer_enable(void) oom_killer_disabled = false; } +/* + * task->mm can be NULL if the task is the exited group leader. So to + * determine whether the task is using a particular mm, we examine all the + * task's threads: if one of those is using this mm then this task was also + * using it. + */ +static bool process_shares_mm(struct task_struct *p, struct mm_struct *mm) +{ + struct task_struct *t; + + for_each_thread(p, t) { + struct mm_struct *t_mm = READ_ONCE(t->mm); + if (t_mm) + return t_mm == mm; + } + return false; +} + #define K(x) ((x) << (PAGE_SHIFT-10)) /* * Must be called while holding a reference to p, which will be released upon @@ -509,10 +525,8 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p, if (__ratelimit(&oom_rs)) dump_header(oc, p, memcg); - task_lock(p); pr_err("%s: Kill process %d (%s) score %u or sacrifice child\n", message, task_pid_nr(p), p->comm, points); - task_unlock(p); /* * If any of p's children has a different mm and is eligible for kill, @@ -525,7 +539,7 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p, list_for_each_entry(child, &t->children, sibling) { unsigned int child_points; - if (child->mm == p->mm) + if (process_shares_mm(child, p->mm)) continue; /* * oom_badness() returns 0 if the thread is unkillable @@ -552,8 +566,15 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p, victim = p; } - /* mm cannot safely be dereferenced after task_unlock(victim) */ + /* Get a reference to safely compare mm after task_unlock(victim) */ mm = victim->mm; + atomic_inc(&mm->mm_count); + /* + * We should send SIGKILL before setting TIF_MEMDIE in order to prevent + * the OOM victim from depleting the memory reserves from the user + * space under its control. + */ + do_send_sig_info(SIGKILL, SEND_SIG_FORCED, victim, true); mark_oom_victim(victim); pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB\n", task_pid_nr(victim), victim->comm, K(victim->mm->total_vm), @@ -571,21 +592,21 @@ void oom_kill_process(struct oom_control *oc, struct task_struct *p, * pending fatal signal. */ rcu_read_lock(); - for_each_process(p) - if (p->mm == mm && !same_thread_group(p, victim) && - !(p->flags & PF_KTHREAD)) { - if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) - continue; + for_each_process(p) { + if (!process_shares_mm(p, mm)) + continue; + if (same_thread_group(p, victim)) + continue; + if (unlikely(p->flags & PF_KTHREAD)) + continue; + if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) + continue; - task_lock(p); /* Protect ->comm from prctl() */ - pr_err("Kill process %d (%s) sharing same memory\n", - task_pid_nr(p), p->comm); - task_unlock(p); - do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, true); - } + do_send_sig_info(SIGKILL, SEND_SIG_FORCED, p, true); + } rcu_read_unlock(); - do_send_sig_info(SIGKILL, SEND_SIG_FORCED, victim, true); + mmdrop(mm); put_task_struct(victim); } #undef K diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 805bbad2e24e..446bb36ee59d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3428,24 +3428,24 @@ EXPORT_SYMBOL(__free_page_frag); struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order) { struct page *page; - struct mem_cgroup *memcg = NULL; - if (!memcg_kmem_newpage_charge(gfp_mask, &memcg, order)) - return NULL; page = alloc_pages(gfp_mask, order); - memcg_kmem_commit_charge(page, memcg, order); + if (page && memcg_kmem_charge(page, gfp_mask, order) != 0) { + __free_pages(page, order); + page = NULL; + } return page; } struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, unsigned int order) { struct page *page; - struct mem_cgroup *memcg = NULL; - if (!memcg_kmem_newpage_charge(gfp_mask, &memcg, order)) - return NULL; page = alloc_pages_node(nid, gfp_mask, order); - memcg_kmem_commit_charge(page, memcg, order); + if (page && memcg_kmem_charge(page, gfp_mask, order) != 0) { + __free_pages(page, order); + page = NULL; + } return page; } @@ -3455,7 +3455,7 @@ struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, unsigned int order) */ void __free_kmem_pages(struct page *page, unsigned int order) { - memcg_kmem_uncharge_pages(page, order); + memcg_kmem_uncharge(page, order); __free_pages(page, order); } @@ -4900,8 +4900,7 @@ static __meminit void zone_pcp_init(struct zone *zone) int __meminit init_currently_empty_zone(struct zone *zone, unsigned long zone_start_pfn, - unsigned long size, - enum memmap_context context) + unsigned long size) { struct pglist_data *pgdat = zone->zone_pgdat; int ret; @@ -5413,8 +5412,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat) set_pageblock_order(); setup_usemap(pgdat, zone, zone_start_pfn, size); - ret = init_currently_empty_zone(zone, zone_start_pfn, - size, MEMMAP_EARLY); + ret = init_currently_empty_zone(zone, zone_start_pfn, size); BUG_ON(ret); memmap_init(size, nid, j, zone_start_pfn); zone_start_pfn += size; @@ -5423,6 +5421,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat) static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) { + unsigned long __maybe_unused offset = 0; + /* Skip empty nodes */ if (!pgdat->node_spanned_pages) return; @@ -5439,6 +5439,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) * for the buddy allocator to function correctly. */ start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); + offset = pgdat->node_start_pfn - start; end = pgdat_end_pfn(pgdat); end = ALIGN(end, MAX_ORDER_NR_PAGES); size = (end - start) * sizeof(struct page); @@ -5446,7 +5447,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) if (!map) map = memblock_virt_alloc_node_nopanic(size, pgdat->node_id); - pgdat->node_mem_map = map + (pgdat->node_start_pfn - start); + pgdat->node_mem_map = map + offset; } #ifndef CONFIG_NEED_MULTIPLE_NODES /* @@ -5454,9 +5455,9 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) */ if (pgdat == NODE_DATA(0)) { mem_map = NODE_DATA(0)->node_mem_map; -#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP +#if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM) if (page_to_pfn(mem_map) != pgdat->node_start_pfn) - mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET); + mem_map -= offset; #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ } #endif @@ -5668,13 +5669,17 @@ static void __init find_zone_movable_pfns_for_nodes(void) */ required_movablecore = roundup(required_movablecore, MAX_ORDER_NR_PAGES); + required_movablecore = min(totalpages, required_movablecore); corepages = totalpages - required_movablecore; required_kernelcore = max(required_kernelcore, corepages); } - /* If kernelcore was not specified, there is no ZONE_MOVABLE */ - if (!required_kernelcore) + /* + * If kernelcore was not specified or kernelcore size is larger + * than totalpages, there is no ZONE_MOVABLE. + */ + if (!required_kernelcore || required_kernelcore >= totalpages) goto out; /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ diff --git a/mm/page_counter.c b/mm/page_counter.c index 11b4beda14ba..7c6a63d2c27f 100644 --- a/mm/page_counter.c +++ b/mm/page_counter.c @@ -56,12 +56,12 @@ void page_counter_charge(struct page_counter *counter, unsigned long nr_pages) * @nr_pages: number of pages to charge * @fail: points first counter to hit its limit, if any * - * Returns 0 on success, or -ENOMEM and @fail if the counter or one of - * its ancestors has hit its configured limit. + * Returns %true on success, or %false and @fail if the counter or one + * of its ancestors has hit its configured limit. */ -int page_counter_try_charge(struct page_counter *counter, - unsigned long nr_pages, - struct page_counter **fail) +bool page_counter_try_charge(struct page_counter *counter, + unsigned long nr_pages, + struct page_counter **fail) { struct page_counter *c; @@ -99,13 +99,13 @@ int page_counter_try_charge(struct page_counter *counter, if (new > c->watermark) c->watermark = new; } - return 0; + return true; failed: for (c = counter; c != *fail; c = c->parent) page_counter_cancel(c, nr_pages); - return -ENOMEM; + return false; } /** diff --git a/mm/percpu.c b/mm/percpu.c index a63b4d82a141..8a943b97a053 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1554,12 +1554,12 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, PCPU_SETUP_BUG_ON(ai->nr_groups <= 0); #ifdef CONFIG_SMP PCPU_SETUP_BUG_ON(!ai->static_size); - PCPU_SETUP_BUG_ON((unsigned long)__per_cpu_start & ~PAGE_MASK); + PCPU_SETUP_BUG_ON(offset_in_page(__per_cpu_start)); #endif PCPU_SETUP_BUG_ON(!base_addr); - PCPU_SETUP_BUG_ON((unsigned long)base_addr & ~PAGE_MASK); + PCPU_SETUP_BUG_ON(offset_in_page(base_addr)); PCPU_SETUP_BUG_ON(ai->unit_size < size_sum); - PCPU_SETUP_BUG_ON(ai->unit_size & ~PAGE_MASK); + PCPU_SETUP_BUG_ON(offset_in_page(ai->unit_size)); PCPU_SETUP_BUG_ON(ai->unit_size < PCPU_MIN_UNIT_SIZE); PCPU_SETUP_BUG_ON(ai->dyn_size < PERCPU_DYNAMIC_EARLY_SIZE); PCPU_SETUP_BUG_ON(pcpu_verify_alloc_info(ai) < 0); @@ -1806,7 +1806,7 @@ static struct pcpu_alloc_info * __init pcpu_build_alloc_info( alloc_size = roundup(min_unit_size, atom_size); upa = alloc_size / min_unit_size; - while (alloc_size % upa || ((alloc_size / upa) & ~PAGE_MASK)) + while (alloc_size % upa || (offset_in_page(alloc_size / upa))) upa--; max_upa = upa; @@ -1838,7 +1838,7 @@ static struct pcpu_alloc_info * __init pcpu_build_alloc_info( for (upa = max_upa; upa; upa--) { int allocs = 0, wasted = 0; - if (alloc_size % upa || ((alloc_size / upa) & ~PAGE_MASK)) + if (alloc_size % upa || (offset_in_page(alloc_size / upa))) continue; for (group = 0; group < nr_groups; group++) { diff --git a/mm/readahead.c b/mm/readahead.c index 24682f6f4cfd..998ad592f408 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -213,7 +213,7 @@ int force_page_cache_readahead(struct address_space *mapping, struct file *filp, if (unlikely(!mapping->a_ops->readpage && !mapping->a_ops->readpages)) return -EINVAL; - nr_to_read = max_sane_readahead(nr_to_read); + nr_to_read = min(nr_to_read, inode_to_bdi(mapping->host)->ra_pages); while (nr_to_read) { int err; @@ -232,16 +232,6 @@ int force_page_cache_readahead(struct address_space *mapping, struct file *filp, return 0; } -#define MAX_READAHEAD ((512*4096)/PAGE_CACHE_SIZE) -/* - * Given a desired number of PAGE_CACHE_SIZE readahead pages, return a - * sensible upper limit. - */ -unsigned long max_sane_readahead(unsigned long nr) -{ - return min(nr, MAX_READAHEAD); -} - /* * Set the initial window size, round to next power of 2 and square * for small size, x 4 for medium, and x 2 for large @@ -380,7 +370,7 @@ ondemand_readahead(struct address_space *mapping, bool hit_readahead_marker, pgoff_t offset, unsigned long req_size) { - unsigned long max = max_sane_readahead(ra->ra_pages); + unsigned long max = ra->ra_pages; pgoff_t prev_offset; /* diff --git a/mm/rmap.c b/mm/rmap.c index f5b5c1f3dcd7..b577fbb98d4b 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1304,6 +1304,10 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, int ret = SWAP_AGAIN; enum ttu_flags flags = (enum ttu_flags)arg; + /* munlock has nothing to gain from examining un-locked vmas */ + if ((flags & TTU_MUNLOCK) && !(vma->vm_flags & VM_LOCKED)) + goto out; + pte = page_check_address(page, mm, address, &ptl, 0); if (!pte) goto out; @@ -1314,9 +1318,12 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * skipped over this mm) then we should reactivate it. */ if (!(flags & TTU_IGNORE_MLOCK)) { - if (vma->vm_flags & VM_LOCKED) - goto out_mlock; - + if (vma->vm_flags & VM_LOCKED) { + /* Holding pte lock, we do *not* need mmap_sem here */ + mlock_vma_page(page); + ret = SWAP_MLOCK; + goto out_unmap; + } if (flags & TTU_MUNLOCK) goto out_unmap; } @@ -1352,7 +1359,9 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, update_hiwater_rss(mm); if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) { - if (!PageHuge(page)) { + if (PageHuge(page)) { + hugetlb_count_sub(1 << compound_order(page), mm); + } else { if (PageAnon(page)) dec_mm_counter(mm, MM_ANONPAGES); else @@ -1370,47 +1379,44 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, dec_mm_counter(mm, MM_ANONPAGES); else dec_mm_counter(mm, MM_FILEPAGES); + } else if (IS_ENABLED(CONFIG_MIGRATION) && (flags & TTU_MIGRATION)) { + swp_entry_t entry; + pte_t swp_pte; + /* + * Store the pfn of the page in a special migration + * pte. do_swap_page() will wait until the migration + * pte is removed and then restart fault handling. + */ + entry = make_migration_entry(page, pte_write(pteval)); + swp_pte = swp_entry_to_pte(entry); + if (pte_soft_dirty(pteval)) + swp_pte = pte_swp_mksoft_dirty(swp_pte); + set_pte_at(mm, address, pte, swp_pte); } else if (PageAnon(page)) { swp_entry_t entry = { .val = page_private(page) }; pte_t swp_pte; - - if (PageSwapCache(page)) { - /* - * Store the swap location in the pte. - * See handle_pte_fault() ... - */ - if (swap_duplicate(entry) < 0) { - set_pte_at(mm, address, pte, pteval); - ret = SWAP_FAIL; - goto out_unmap; - } - if (list_empty(&mm->mmlist)) { - spin_lock(&mmlist_lock); - if (list_empty(&mm->mmlist)) - list_add(&mm->mmlist, &init_mm.mmlist); - spin_unlock(&mmlist_lock); - } - dec_mm_counter(mm, MM_ANONPAGES); - inc_mm_counter(mm, MM_SWAPENTS); - } else if (IS_ENABLED(CONFIG_MIGRATION)) { - /* - * Store the pfn of the page in a special migration - * pte. do_swap_page() will wait until the migration - * pte is removed and then restart fault handling. - */ - BUG_ON(!(flags & TTU_MIGRATION)); - entry = make_migration_entry(page, pte_write(pteval)); + /* + * Store the swap location in the pte. + * See handle_pte_fault() ... + */ + VM_BUG_ON_PAGE(!PageSwapCache(page), page); + if (swap_duplicate(entry) < 0) { + set_pte_at(mm, address, pte, pteval); + ret = SWAP_FAIL; + goto out_unmap; + } + if (list_empty(&mm->mmlist)) { + spin_lock(&mmlist_lock); + if (list_empty(&mm->mmlist)) + list_add(&mm->mmlist, &init_mm.mmlist); + spin_unlock(&mmlist_lock); } + dec_mm_counter(mm, MM_ANONPAGES); + inc_mm_counter(mm, MM_SWAPENTS); swp_pte = swp_entry_to_pte(entry); if (pte_soft_dirty(pteval)) swp_pte = pte_swp_mksoft_dirty(swp_pte); set_pte_at(mm, address, pte, swp_pte); - } else if (IS_ENABLED(CONFIG_MIGRATION) && - (flags & TTU_MIGRATION)) { - /* Establish migration entry for a file page */ - swp_entry_t entry; - entry = make_migration_entry(page, pte_write(pteval)); - set_pte_at(mm, address, pte, swp_entry_to_pte(entry)); } else dec_mm_counter(mm, MM_FILEPAGES); @@ -1419,31 +1425,10 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, out_unmap: pte_unmap_unlock(pte, ptl); - if (ret != SWAP_FAIL && !(flags & TTU_MUNLOCK)) + if (ret != SWAP_FAIL && ret != SWAP_MLOCK && !(flags & TTU_MUNLOCK)) mmu_notifier_invalidate_page(mm, address); out: return ret; - -out_mlock: - pte_unmap_unlock(pte, ptl); - - - /* - * We need mmap_sem locking, Otherwise VM_LOCKED check makes - * unstable result and race. Plus, We can't wait here because - * we now hold anon_vma->rwsem or mapping->i_mmap_rwsem. - * if trylock failed, the page remain in evictable lru and later - * vmscan could retry to move the page to unevictable lru if the - * page is actually mlocked. - */ - if (down_read_trylock(&vma->vm_mm->mmap_sem)) { - if (vma->vm_flags & VM_LOCKED) { - mlock_vma_page(page); - ret = SWAP_MLOCK; - } - up_read(&vma->vm_mm->mmap_sem); - } - return ret; } bool is_vma_temporary_stack(struct vm_area_struct *vma) @@ -1607,6 +1592,8 @@ static int rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc) struct vm_area_struct *vma = avc->vma; unsigned long address = vma_address(page, vma); + cond_resched(); + if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg)) continue; @@ -1656,6 +1643,8 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc) vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) { unsigned long address = vma_address(page, vma); + cond_resched(); + if (rwc->invalid_vma && rwc->invalid_vma(vma, rwc->arg)) continue; diff --git a/mm/shmem.c b/mm/shmem.c index 48ce82926d93..3b8b73928398 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -548,12 +548,12 @@ static int shmem_getattr(struct vfsmount *mnt, struct dentry *dentry, struct inode *inode = dentry->d_inode; struct shmem_inode_info *info = SHMEM_I(inode); - spin_lock(&info->lock); - shmem_recalc_inode(inode); - spin_unlock(&info->lock); - + if (info->alloced - info->swapped != inode->i_mapping->nrpages) { + spin_lock(&info->lock); + shmem_recalc_inode(inode); + spin_unlock(&info->lock); + } generic_fillattr(inode, stat); - return 0; } @@ -586,10 +586,16 @@ static int shmem_setattr(struct dentry *dentry, struct iattr *attr) } if (newsize <= oldsize) { loff_t holebegin = round_up(newsize, PAGE_SIZE); - unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); - shmem_truncate_range(inode, newsize, (loff_t)-1); + if (oldsize > holebegin) + unmap_mapping_range(inode->i_mapping, + holebegin, 0, 1); + if (info->alloced) + shmem_truncate_range(inode, + newsize, (loff_t)-1); /* unmap again to remove racily COWed private pages */ - unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); + if (oldsize > holebegin) + unmap_mapping_range(inode->i_mapping, + holebegin, 0, 1); } } @@ -1023,7 +1029,7 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp, */ oldpage = newpage; } else { - mem_cgroup_migrate(oldpage, newpage, true); + mem_cgroup_replace_page(oldpage, newpage); lru_cache_add_anon(newpage); *pagep = newpage; } diff --git a/mm/slab.c b/mm/slab.c index 4fcc5dd8d5a6..272e809404d5 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -282,6 +282,7 @@ static void kmem_cache_node_init(struct kmem_cache_node *parent) #define CFLGS_OFF_SLAB (0x80000000UL) #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) +#define OFF_SLAB_MIN_SIZE (max_t(size_t, PAGE_SIZE >> 5, KMALLOC_MIN_SIZE + 1)) #define BATCHREFILL_LIMIT 16 /* @@ -1592,16 +1593,17 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, if (cachep->flags & SLAB_RECLAIM_ACCOUNT) flags |= __GFP_RECLAIMABLE; - if (memcg_charge_slab(cachep, flags, cachep->gfporder)) - return NULL; - page = __alloc_pages_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder); if (!page) { - memcg_uncharge_slab(cachep, cachep->gfporder); slab_out_of_memory(cachep, flags, nodeid); return NULL; } + if (memcg_charge_slab(page, flags, cachep->gfporder, cachep)) { + __free_pages(page, cachep->gfporder); + return NULL; + } + /* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */ if (page_is_pfmemalloc(page)) pfmemalloc_active = true; @@ -1653,8 +1655,7 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page) if (current->reclaim_state) current->reclaim_state->reclaimed_slab += nr_freed; - __free_pages(page, cachep->gfporder); - memcg_uncharge_slab(cachep, cachep->gfporder); + __free_kmem_pages(page, cachep->gfporder); } static void kmem_rcu_free(struct rcu_head *head) @@ -2212,7 +2213,7 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) * it too early on. Always use on-slab management when * SLAB_NOLEAKTRACE to avoid recursive calls into kmemleak) */ - if ((size >= (PAGE_SIZE >> 5)) && !slab_early_init && + if (size >= OFF_SLAB_MIN_SIZE && !slab_early_init && !(flags & SLAB_NOLEAKTRACE)) /* * Size is large, assume best to place the slab management obj @@ -2276,7 +2277,7 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) /* * This is a possibility for one of the kmalloc_{dma,}_caches. * But since we go off slab only for object size greater than - * PAGE_SIZE/8, and kmalloc_{dma,}_caches get created + * OFF_SLAB_MIN_SIZE, and kmalloc_{dma,}_caches get created * in ascending order,this should not happen at all. * But leave a BUG_ON for some lucky dude. */ diff --git a/mm/slab.h b/mm/slab.h index a3a967d7d7c2..27492eb678f7 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -181,10 +181,6 @@ bool __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); list_for_each_entry(iter, &(root)->memcg_params.list, \ memcg_params.list) -#define for_each_memcg_cache_safe(iter, tmp, root) \ - list_for_each_entry_safe(iter, tmp, &(root)->memcg_params.list, \ - memcg_params.list) - static inline bool is_root_cache(struct kmem_cache *s) { return s->memcg_params.is_root_cache; @@ -240,23 +236,16 @@ static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) return s->memcg_params.root_cache; } -static __always_inline int memcg_charge_slab(struct kmem_cache *s, - gfp_t gfp, int order) +static __always_inline int memcg_charge_slab(struct page *page, + gfp_t gfp, int order, + struct kmem_cache *s) { if (!memcg_kmem_enabled()) return 0; if (is_root_cache(s)) return 0; - return memcg_charge_kmem(s->memcg_params.memcg, gfp, 1 << order); -} - -static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order) -{ - if (!memcg_kmem_enabled()) - return; - if (is_root_cache(s)) - return; - memcg_uncharge_kmem(s->memcg_params.memcg, 1 << order); + return __memcg_kmem_charge_memcg(page, gfp, order, + s->memcg_params.memcg); } extern void slab_init_memcg_params(struct kmem_cache *); @@ -265,8 +254,6 @@ extern void slab_init_memcg_params(struct kmem_cache *); #define for_each_memcg_cache(iter, root) \ for ((void)(iter), (void)(root); 0; ) -#define for_each_memcg_cache_safe(iter, tmp, root) \ - for ((void)(iter), (void)(tmp), (void)(root); 0; ) static inline bool is_root_cache(struct kmem_cache *s) { @@ -295,15 +282,12 @@ static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) return s; } -static inline int memcg_charge_slab(struct kmem_cache *s, gfp_t gfp, int order) +static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order, + struct kmem_cache *s) { return 0; } -static inline void memcg_uncharge_slab(struct kmem_cache *s, int order) -{ -} - static inline void slab_init_memcg_params(struct kmem_cache *s) { } diff --git a/mm/slab_common.c b/mm/slab_common.c index 5ce4faeb16fb..d88e97c10a2e 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -316,10 +316,10 @@ unsigned long calculate_alignment(unsigned long flags, return ALIGN(align, sizeof(void *)); } -static struct kmem_cache * -do_kmem_cache_create(const char *name, size_t object_size, size_t size, - size_t align, unsigned long flags, void (*ctor)(void *), - struct mem_cgroup *memcg, struct kmem_cache *root_cache) +static struct kmem_cache *create_cache(const char *name, + size_t object_size, size_t size, size_t align, + unsigned long flags, void (*ctor)(void *), + struct mem_cgroup *memcg, struct kmem_cache *root_cache) { struct kmem_cache *s; int err; @@ -384,7 +384,7 @@ struct kmem_cache * kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { - struct kmem_cache *s; + struct kmem_cache *s = NULL; const char *cache_name; int err; @@ -396,7 +396,6 @@ kmem_cache_create(const char *name, size_t size, size_t align, err = kmem_cache_sanity_check(name, size); if (err) { - s = NULL; /* suppress uninit var warning */ goto out_unlock; } @@ -418,9 +417,9 @@ kmem_cache_create(const char *name, size_t size, size_t align, goto out_unlock; } - s = do_kmem_cache_create(cache_name, size, size, - calculate_alignment(flags, align, size), - flags, ctor, NULL, NULL); + s = create_cache(cache_name, size, size, + calculate_alignment(flags, align, size), + flags, ctor, NULL, NULL); if (IS_ERR(s)) { err = PTR_ERR(s); kfree_const(cache_name); @@ -448,29 +447,20 @@ out_unlock: } EXPORT_SYMBOL(kmem_cache_create); -static int do_kmem_cache_shutdown(struct kmem_cache *s, +static int shutdown_cache(struct kmem_cache *s, struct list_head *release, bool *need_rcu_barrier) { - if (__kmem_cache_shutdown(s) != 0) { - printk(KERN_ERR "kmem_cache_destroy %s: " - "Slab cache still has objects\n", s->name); - dump_stack(); + if (__kmem_cache_shutdown(s) != 0) return -EBUSY; - } if (s->flags & SLAB_DESTROY_BY_RCU) *need_rcu_barrier = true; -#ifdef CONFIG_MEMCG_KMEM - if (!is_root_cache(s)) - list_del(&s->memcg_params.list); -#endif list_move(&s->list, release); return 0; } -static void do_kmem_cache_release(struct list_head *release, - bool need_rcu_barrier) +static void release_caches(struct list_head *release, bool need_rcu_barrier) { struct kmem_cache *s, *s2; @@ -536,10 +526,10 @@ void memcg_create_kmem_cache(struct mem_cgroup *memcg, if (!cache_name) goto out_unlock; - s = do_kmem_cache_create(cache_name, root_cache->object_size, - root_cache->size, root_cache->align, - root_cache->flags, root_cache->ctor, - memcg, root_cache); + s = create_cache(cache_name, root_cache->object_size, + root_cache->size, root_cache->align, + root_cache->flags, root_cache->ctor, + memcg, root_cache); /* * If we could not create a memcg cache, do not complain, because * that's not critical at all as we can always proceed with the root @@ -598,6 +588,18 @@ void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg) put_online_cpus(); } +static int __shutdown_memcg_cache(struct kmem_cache *s, + struct list_head *release, bool *need_rcu_barrier) +{ + BUG_ON(is_root_cache(s)); + + if (shutdown_cache(s, release, need_rcu_barrier)) + return -EBUSY; + + list_del(&s->memcg_params.list); + return 0; +} + void memcg_destroy_kmem_caches(struct mem_cgroup *memcg) { LIST_HEAD(release); @@ -615,14 +617,76 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *memcg) * The cgroup is about to be freed and therefore has no charges * left. Hence, all its caches must be empty by now. */ - BUG_ON(do_kmem_cache_shutdown(s, &release, &need_rcu_barrier)); + BUG_ON(__shutdown_memcg_cache(s, &release, &need_rcu_barrier)); } mutex_unlock(&slab_mutex); put_online_mems(); put_online_cpus(); - do_kmem_cache_release(&release, need_rcu_barrier); + release_caches(&release, need_rcu_barrier); +} + +static int shutdown_memcg_caches(struct kmem_cache *s, + struct list_head *release, bool *need_rcu_barrier) +{ + struct memcg_cache_array *arr; + struct kmem_cache *c, *c2; + LIST_HEAD(busy); + int i; + + BUG_ON(!is_root_cache(s)); + + /* + * First, shutdown active caches, i.e. caches that belong to online + * memory cgroups. + */ + arr = rcu_dereference_protected(s->memcg_params.memcg_caches, + lockdep_is_held(&slab_mutex)); + for_each_memcg_cache_index(i) { + c = arr->entries[i]; + if (!c) + continue; + if (__shutdown_memcg_cache(c, release, need_rcu_barrier)) + /* + * The cache still has objects. Move it to a temporary + * list so as not to try to destroy it for a second + * time while iterating over inactive caches below. + */ + list_move(&c->memcg_params.list, &busy); + else + /* + * The cache is empty and will be destroyed soon. Clear + * the pointer to it in the memcg_caches array so that + * it will never be accessed even if the root cache + * stays alive. + */ + arr->entries[i] = NULL; + } + + /* + * Second, shutdown all caches left from memory cgroups that are now + * offline. + */ + list_for_each_entry_safe(c, c2, &s->memcg_params.list, + memcg_params.list) + __shutdown_memcg_cache(c, release, need_rcu_barrier); + + list_splice(&busy, &s->memcg_params.list); + + /* + * A cache being destroyed must be empty. In particular, this means + * that all per memcg caches attached to it must be empty too. + */ + if (!list_empty(&s->memcg_params.list)) + return -EBUSY; + return 0; +} +#else +static inline int shutdown_memcg_caches(struct kmem_cache *s, + struct list_head *release, bool *need_rcu_barrier) +{ + return 0; } #endif /* CONFIG_MEMCG_KMEM */ @@ -635,16 +699,13 @@ void slab_kmem_cache_release(struct kmem_cache *s) void kmem_cache_destroy(struct kmem_cache *s) { - struct kmem_cache *c, *c2; LIST_HEAD(release); bool need_rcu_barrier = false; - bool busy = false; + int err; if (unlikely(!s)) return; - BUG_ON(!is_root_cache(s)); - get_online_cpus(); get_online_mems(); @@ -654,21 +715,22 @@ void kmem_cache_destroy(struct kmem_cache *s) if (s->refcount) goto out_unlock; - for_each_memcg_cache_safe(c, c2, s) { - if (do_kmem_cache_shutdown(c, &release, &need_rcu_barrier)) - busy = true; - } - - if (!busy) - do_kmem_cache_shutdown(s, &release, &need_rcu_barrier); + err = shutdown_memcg_caches(s, &release, &need_rcu_barrier); + if (!err) + err = shutdown_cache(s, &release, &need_rcu_barrier); + if (err) { + pr_err("kmem_cache_destroy %s: " + "Slab cache still has objects\n", s->name); + dump_stack(); + } out_unlock: mutex_unlock(&slab_mutex); put_online_mems(); put_online_cpus(); - do_kmem_cache_release(&release, need_rcu_barrier); + release_caches(&release, need_rcu_barrier); } EXPORT_SYMBOL(kmem_cache_destroy); @@ -692,7 +754,7 @@ int kmem_cache_shrink(struct kmem_cache *cachep) } EXPORT_SYMBOL(kmem_cache_shrink); -int slab_is_available(void) +bool slab_is_available(void) { return slab_state >= UP; } diff --git a/mm/slub.c b/mm/slub.c index f614b5dc396b..75a5fa92ac2a 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -459,8 +459,10 @@ static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map) /* * Debug settings: */ -#ifdef CONFIG_SLUB_DEBUG_ON +#if defined(CONFIG_SLUB_DEBUG_ON) static int slub_debug = DEBUG_DEFAULT_FLAGS; +#elif defined(CONFIG_KASAN) +static int slub_debug = SLAB_STORE_USER; #else static int slub_debug; #endif @@ -1328,16 +1330,15 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s, flags |= __GFP_NOTRACK; - if (memcg_charge_slab(s, flags, order)) - return NULL; - if (node == NUMA_NO_NODE) page = alloc_pages(flags, order); else page = __alloc_pages_node(node, flags, order); - if (!page) - memcg_uncharge_slab(s, order); + if (page && memcg_charge_slab(page, flags, order, s)) { + __free_pages(page, order); + page = NULL; + } return page; } @@ -1476,8 +1477,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page) page_mapcount_reset(page); if (current->reclaim_state) current->reclaim_state->reclaimed_slab += pages; - __free_pages(page, order); - memcg_uncharge_slab(s, order); + __free_kmem_pages(page, order); } #define need_reserve_slab_rcu \ @@ -2912,20 +2912,15 @@ static inline int slab_order(int size, int min_objects, if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE) return get_order(size * MAX_OBJS_PER_PAGE) - 1; - for (order = max(min_order, - fls(min_objects * size - 1) - PAGE_SHIFT); + for (order = max(min_order, get_order(min_objects * size + reserved)); order <= max_order; order++) { unsigned long slab_size = PAGE_SIZE << order; - if (slab_size < min_objects * size + reserved) - continue; - rem = (slab_size - reserved) % size; if (rem <= slab_size / fract_leftover) break; - } return order; @@ -2943,7 +2938,7 @@ static inline int calculate_order(int size, int reserved) * works by first attempting to generate a layout with * the best configuration and backing off gradually. * - * First we reduce the acceptable waste in a slab. Then + * First we increase the acceptable waste in a slab. Then * we reduce the minimum objects required in a slab. */ min_objects = slub_min_objects; diff --git a/mm/util.c b/mm/util.c index 68ff8a5361e7..9af1c12b310c 100644 --- a/mm/util.c +++ b/mm/util.c @@ -309,7 +309,7 @@ unsigned long vm_mmap(struct file *file, unsigned long addr, { if (unlikely(offset + PAGE_ALIGN(len) < offset)) return -EINVAL; - if (unlikely(offset & ~PAGE_MASK)) + if (unlikely(offset_in_page(offset))) return -EINVAL; return vm_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); diff --git a/mm/vmacache.c b/mm/vmacache.c index b6e3662fe339..fd09dc9c6812 100644 --- a/mm/vmacache.c +++ b/mm/vmacache.c @@ -52,7 +52,7 @@ void vmacache_flush_all(struct mm_struct *mm) * Also handle the case where a kernel thread has adopted this mm via use_mm(). * That kernel thread's vmacache is not applicable to this mm. */ -static bool vmacache_valid_mm(struct mm_struct *mm) +static inline bool vmacache_valid_mm(struct mm_struct *mm) { return current->mm == mm && !(current->flags & PF_KTHREAD); } diff --git a/mm/vmalloc.c b/mm/vmalloc.c index af3a519e40c2..9db9ef5e8481 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -358,7 +358,7 @@ static struct vmap_area *alloc_vmap_area(unsigned long size, struct vmap_area *first; BUG_ON(!size); - BUG_ON(size & ~PAGE_MASK); + BUG_ON(offset_in_page(size)); BUG_ON(!is_power_of_2(align)); va = kmalloc_node(sizeof(struct vmap_area), @@ -936,7 +936,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask) void *vaddr = NULL; unsigned int order; - BUG_ON(size & ~PAGE_MASK); + BUG_ON(offset_in_page(size)); BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC); if (WARN_ON(size == 0)) { /* @@ -989,7 +989,7 @@ static void vb_free(const void *addr, unsigned long size) unsigned int order; struct vmap_block *vb; - BUG_ON(size & ~PAGE_MASK); + BUG_ON(offset_in_page(size)); BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC); flush_cache_vunmap((unsigned long)addr, (unsigned long)addr + size); @@ -1902,7 +1902,7 @@ static int aligned_vread(char *buf, char *addr, unsigned long count) while (count) { unsigned long offset, length; - offset = (unsigned long)addr & ~PAGE_MASK; + offset = offset_in_page(addr); length = PAGE_SIZE - offset; if (length > count) length = count; @@ -1941,7 +1941,7 @@ static int aligned_vwrite(char *buf, char *addr, unsigned long count) while (count) { unsigned long offset, length; - offset = (unsigned long)addr & ~PAGE_MASK; + offset = offset_in_page(addr); length = PAGE_SIZE - offset; if (length > count) length = count; @@ -2392,7 +2392,7 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, bool purged = false; /* verify parameters and allocate data structures */ - BUG_ON(align & ~PAGE_MASK || !is_power_of_2(align)); + BUG_ON(offset_in_page(align) || !is_power_of_2(align)); for (last_area = 0, area = 0; area < nr_vms; area++) { start = offsets[area]; end = start + sizes[area]; diff --git a/mm/vmscan.c b/mm/vmscan.c index e7057af54b6e..55721b619aee 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -194,7 +194,7 @@ static bool sane_reclaim(struct scan_control *sc) static unsigned long zone_reclaimable_pages(struct zone *zone) { - int nr; + unsigned long nr; nr = zone_page_state(zone, NR_ACTIVE_FILE) + zone_page_state(zone, NR_INACTIVE_FILE); @@ -1859,17 +1859,14 @@ static void shrink_active_list(unsigned long nr_to_scan, } #ifdef CONFIG_SWAP -static int inactive_anon_is_low_global(struct zone *zone) +static bool inactive_anon_is_low_global(struct zone *zone) { unsigned long active, inactive; active = zone_page_state(zone, NR_ACTIVE_ANON); inactive = zone_page_state(zone, NR_INACTIVE_ANON); - if (inactive * zone->inactive_ratio < active) - return 1; - - return 0; + return inactive * zone->inactive_ratio < active; } /** @@ -1879,14 +1876,14 @@ static int inactive_anon_is_low_global(struct zone *zone) * Returns true if the zone does not have enough inactive anon pages, * meaning some active anon pages need to be deactivated. */ -static int inactive_anon_is_low(struct lruvec *lruvec) +static bool inactive_anon_is_low(struct lruvec *lruvec) { /* * If we don't have swap space, anonymous page deactivation * is pointless. */ if (!total_swap_pages) - return 0; + return false; if (!mem_cgroup_disabled()) return mem_cgroup_inactive_anon_is_low(lruvec); @@ -1894,9 +1891,9 @@ static int inactive_anon_is_low(struct lruvec *lruvec) return inactive_anon_is_low_global(lruvec_zone(lruvec)); } #else -static inline int inactive_anon_is_low(struct lruvec *lruvec) +static inline bool inactive_anon_is_low(struct lruvec *lruvec) { - return 0; + return false; } #endif @@ -1914,7 +1911,7 @@ static inline int inactive_anon_is_low(struct lruvec *lruvec) * This uses a different ratio than the anonymous pages, because * the page cache uses a use-once replacement algorithm. */ -static int inactive_file_is_low(struct lruvec *lruvec) +static bool inactive_file_is_low(struct lruvec *lruvec) { unsigned long inactive; unsigned long active; @@ -1925,7 +1922,7 @@ static int inactive_file_is_low(struct lruvec *lruvec) return active > inactive; } -static int inactive_list_is_low(struct lruvec *lruvec, enum lru_list lru) +static bool inactive_list_is_low(struct lruvec *lruvec, enum lru_list lru) { if (is_file_lru(lru)) return inactive_file_is_low(lruvec); @@ -3696,10 +3693,10 @@ static inline unsigned long zone_unmapped_file_pages(struct zone *zone) } /* Work out how many page cache pages we can reclaim in this reclaim_mode */ -static long zone_pagecache_reclaimable(struct zone *zone) +static unsigned long zone_pagecache_reclaimable(struct zone *zone) { - long nr_pagecache_reclaimable; - long delta = 0; + unsigned long nr_pagecache_reclaimable; + unsigned long delta = 0; /* * If RECLAIM_UNMAP is set, then all file pages are considered diff --git a/mm/vmstat.c b/mm/vmstat.c index fbf14485a049..ffcb4f58bf3e 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -591,6 +591,28 @@ void zone_statistics(struct zone *preferred_zone, struct zone *z, gfp_t flags) else __inc_zone_state(z, NUMA_OTHER); } + +/* + * Determine the per node value of a stat item. + */ +unsigned long node_page_state(int node, enum zone_stat_item item) +{ + struct zone *zones = NODE_DATA(node)->node_zones; + + return +#ifdef CONFIG_ZONE_DMA + zone_page_state(&zones[ZONE_DMA], item) + +#endif +#ifdef CONFIG_ZONE_DMA32 + zone_page_state(&zones[ZONE_DMA32], item) + +#endif +#ifdef CONFIG_HIGHMEM + zone_page_state(&zones[ZONE_HIGHMEM], item) + +#endif + zone_page_state(&zones[ZONE_NORMAL], item) + + zone_page_state(&zones[ZONE_MOVABLE], item); +} + #endif #ifdef CONFIG_COMPACTION diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile index 3c53cac15de1..e4bb1de1d526 100644 --- a/tools/testing/selftests/vm/Makefile +++ b/tools/testing/selftests/vm/Makefile @@ -5,6 +5,8 @@ BINARIES = compaction_test BINARIES += hugepage-mmap BINARIES += hugepage-shm BINARIES += map_hugetlb +BINARIES += mlock2-tests +BINARIES += on-fault-limit BINARIES += thuge-gen BINARIES += transhuge-stress BINARIES += userfaultfd diff --git a/tools/testing/selftests/vm/mlock2-tests.c b/tools/testing/selftests/vm/mlock2-tests.c new file mode 100644 index 000000000000..4431994aade2 --- /dev/null +++ b/tools/testing/selftests/vm/mlock2-tests.c @@ -0,0 +1,736 @@ +#include <sys/mman.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <sys/time.h> +#include <sys/resource.h> +#include <syscall.h> +#include <errno.h> +#include <stdbool.h> + +#ifndef MLOCK_ONFAULT +#define MLOCK_ONFAULT 1 +#endif + +#ifndef MCL_ONFAULT +#define MCL_ONFAULT (MCL_FUTURE << 1) +#endif + +static int mlock2_(void *start, size_t len, int flags) +{ +#ifdef __NR_mlock2 + return syscall(__NR_mlock2, start, len, flags); +#else + errno = ENOSYS; + return -1; +#endif +} + +struct vm_boundaries { + unsigned long start; + unsigned long end; +}; + +static int get_vm_area(unsigned long addr, struct vm_boundaries *area) +{ + FILE *file; + int ret = 1; + char line[1024] = {0}; + char *end_addr; + char *stop; + unsigned long start; + unsigned long end; + + if (!area) + return ret; + + file = fopen("/proc/self/maps", "r"); + if (!file) { + perror("fopen"); + return ret; + } + + memset(area, 0, sizeof(struct vm_boundaries)); + + while(fgets(line, 1024, file)) { + end_addr = strchr(line, '-'); + if (!end_addr) { + printf("cannot parse /proc/self/maps\n"); + goto out; + } + *end_addr = '\0'; + end_addr++; + stop = strchr(end_addr, ' '); + if (!stop) { + printf("cannot parse /proc/self/maps\n"); + goto out; + } + stop = '\0'; + + sscanf(line, "%lx", &start); + sscanf(end_addr, "%lx", &end); + + if (start <= addr && end > addr) { + area->start = start; + area->end = end; + ret = 0; + goto out; + } + } +out: + fclose(file); + return ret; +} + +static uint64_t get_pageflags(unsigned long addr) +{ + FILE *file; + uint64_t pfn; + unsigned long offset; + + file = fopen("/proc/self/pagemap", "r"); + if (!file) { + perror("fopen pagemap"); + _exit(1); + } + + offset = addr / getpagesize() * sizeof(pfn); + + if (fseek(file, offset, SEEK_SET)) { + perror("fseek pagemap"); + _exit(1); + } + + if (fread(&pfn, sizeof(pfn), 1, file) != 1) { + perror("fread pagemap"); + _exit(1); + } + + fclose(file); + return pfn; +} + +static uint64_t get_kpageflags(unsigned long pfn) +{ + uint64_t flags; + FILE *file; + + file = fopen("/proc/kpageflags", "r"); + if (!file) { + perror("fopen kpageflags"); + _exit(1); + } + + if (fseek(file, pfn * sizeof(flags), SEEK_SET)) { + perror("fseek kpageflags"); + _exit(1); + } + + if (fread(&flags, sizeof(flags), 1, file) != 1) { + perror("fread kpageflags"); + _exit(1); + } + + fclose(file); + return flags; +} + +static FILE *seek_to_smaps_entry(unsigned long addr) +{ + FILE *file; + char *line = NULL; + size_t size = 0; + unsigned long start, end; + char perms[5]; + unsigned long offset; + char dev[32]; + unsigned long inode; + char path[BUFSIZ]; + + file = fopen("/proc/self/smaps", "r"); + if (!file) { + perror("fopen smaps"); + _exit(1); + } + + while (getline(&line, &size, file) > 0) { + if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n", + &start, &end, perms, &offset, dev, &inode, path) < 6) + goto next; + + if (start <= addr && addr < end) + goto out; + +next: + free(line); + line = NULL; + size = 0; + } + + fclose(file); + file = NULL; + +out: + free(line); + return file; +} + +#define VMFLAGS "VmFlags:" + +static bool is_vmflag_set(unsigned long addr, const char *vmflag) +{ + char *line = NULL; + char *flags; + size_t size = 0; + bool ret = false; + FILE *smaps; + + smaps = seek_to_smaps_entry(addr); + if (!smaps) { + printf("Unable to parse /proc/self/smaps\n"); + goto out; + } + + while (getline(&line, &size, smaps) > 0) { + if (!strstr(line, VMFLAGS)) { + free(line); + line = NULL; + size = 0; + continue; + } + + flags = line + strlen(VMFLAGS); + ret = (strstr(flags, vmflag) != NULL); + goto out; + } + +out: + free(line); + fclose(smaps); + return ret; +} + +#define SIZE "Size:" +#define RSS "Rss:" +#define LOCKED "lo" + +static bool is_vma_lock_on_fault(unsigned long addr) +{ + bool ret = false; + bool locked; + FILE *smaps = NULL; + unsigned long vma_size, vma_rss; + char *line = NULL; + char *value; + size_t size = 0; + + locked = is_vmflag_set(addr, LOCKED); + if (!locked) + goto out; + + smaps = seek_to_smaps_entry(addr); + if (!smaps) { + printf("Unable to parse /proc/self/smaps\n"); + goto out; + } + + while (getline(&line, &size, smaps) > 0) { + if (!strstr(line, SIZE)) { + free(line); + line = NULL; + size = 0; + continue; + } + + value = line + strlen(SIZE); + if (sscanf(value, "%lu kB", &vma_size) < 1) { + printf("Unable to parse smaps entry for Size\n"); + goto out; + } + break; + } + + while (getline(&line, &size, smaps) > 0) { + if (!strstr(line, RSS)) { + free(line); + line = NULL; + size = 0; + continue; + } + + value = line + strlen(RSS); + if (sscanf(value, "%lu kB", &vma_rss) < 1) { + printf("Unable to parse smaps entry for Rss\n"); + goto out; + } + break; + } + + ret = locked && (vma_rss < vma_size); +out: + free(line); + if (smaps) + fclose(smaps); + return ret; +} + +#define PRESENT_BIT 0x8000000000000000 +#define PFN_MASK 0x007FFFFFFFFFFFFF +#define UNEVICTABLE_BIT (1UL << 18) + +static int lock_check(char *map) +{ + unsigned long page_size = getpagesize(); + uint64_t page1_flags, page2_flags; + + page1_flags = get_pageflags((unsigned long)map); + page2_flags = get_pageflags((unsigned long)map + page_size); + + /* Both pages should be present */ + if (((page1_flags & PRESENT_BIT) == 0) || + ((page2_flags & PRESENT_BIT) == 0)) { + printf("Failed to make both pages present\n"); + return 1; + } + + page1_flags = get_kpageflags(page1_flags & PFN_MASK); + page2_flags = get_kpageflags(page2_flags & PFN_MASK); + + /* Both pages should be unevictable */ + if (((page1_flags & UNEVICTABLE_BIT) == 0) || + ((page2_flags & UNEVICTABLE_BIT) == 0)) { + printf("Failed to make both pages unevictable\n"); + return 1; + } + + if (!is_vmflag_set((unsigned long)map, LOCKED)) { + printf("VMA flag %s is missing on page 1\n", LOCKED); + return 1; + } + + if (!is_vmflag_set((unsigned long)map + page_size, LOCKED)) { + printf("VMA flag %s is missing on page 2\n", LOCKED); + return 1; + } + + return 0; +} + +static int unlock_lock_check(char *map) +{ + unsigned long page_size = getpagesize(); + uint64_t page1_flags, page2_flags; + + page1_flags = get_pageflags((unsigned long)map); + page2_flags = get_pageflags((unsigned long)map + page_size); + page1_flags = get_kpageflags(page1_flags & PFN_MASK); + page2_flags = get_kpageflags(page2_flags & PFN_MASK); + + if ((page1_flags & UNEVICTABLE_BIT) || (page2_flags & UNEVICTABLE_BIT)) { + printf("A page is still marked unevictable after unlock\n"); + return 1; + } + + if (is_vmflag_set((unsigned long)map, LOCKED)) { + printf("VMA flag %s is present on page 1 after unlock\n", LOCKED); + return 1; + } + + if (is_vmflag_set((unsigned long)map + page_size, LOCKED)) { + printf("VMA flag %s is present on page 2 after unlock\n", LOCKED); + return 1; + } + + return 0; +} + +static int test_mlock_lock() +{ + char *map; + int ret = 1; + unsigned long page_size = getpagesize(); + + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); + if (map == MAP_FAILED) { + perror("test_mlock_locked mmap"); + goto out; + } + + if (mlock2_(map, 2 * page_size, 0)) { + if (errno == ENOSYS) { + printf("Cannot call new mlock family, skipping test\n"); + _exit(0); + } + perror("mlock2(0)"); + goto unmap; + } + + if (lock_check(map)) + goto unmap; + + /* Now unlock and recheck attributes */ + if (munlock(map, 2 * page_size)) { + perror("munlock()"); + goto unmap; + } + + ret = unlock_lock_check(map); + +unmap: + munmap(map, 2 * page_size); +out: + return ret; +} + +static int onfault_check(char *map) +{ + unsigned long page_size = getpagesize(); + uint64_t page1_flags, page2_flags; + + page1_flags = get_pageflags((unsigned long)map); + page2_flags = get_pageflags((unsigned long)map + page_size); + + /* Neither page should be present */ + if ((page1_flags & PRESENT_BIT) || (page2_flags & PRESENT_BIT)) { + printf("Pages were made present by MLOCK_ONFAULT\n"); + return 1; + } + + *map = 'a'; + page1_flags = get_pageflags((unsigned long)map); + page2_flags = get_pageflags((unsigned long)map + page_size); + + /* Only page 1 should be present */ + if ((page1_flags & PRESENT_BIT) == 0) { + printf("Page 1 is not present after fault\n"); + return 1; + } else if (page2_flags & PRESENT_BIT) { + printf("Page 2 was made present\n"); + return 1; + } + + page1_flags = get_kpageflags(page1_flags & PFN_MASK); + + /* Page 1 should be unevictable */ + if ((page1_flags & UNEVICTABLE_BIT) == 0) { + printf("Failed to make faulted page unevictable\n"); + return 1; + } + + if (!is_vma_lock_on_fault((unsigned long)map)) { + printf("VMA is not marked for lock on fault\n"); + return 1; + } + + if (!is_vma_lock_on_fault((unsigned long)map + page_size)) { + printf("VMA is not marked for lock on fault\n"); + return 1; + } + + return 0; +} + +static int unlock_onfault_check(char *map) +{ + unsigned long page_size = getpagesize(); + uint64_t page1_flags; + + page1_flags = get_pageflags((unsigned long)map); + page1_flags = get_kpageflags(page1_flags & PFN_MASK); + + if (page1_flags & UNEVICTABLE_BIT) { + printf("Page 1 is still marked unevictable after unlock\n"); + return 1; + } + + if (is_vma_lock_on_fault((unsigned long)map) || + is_vma_lock_on_fault((unsigned long)map + page_size)) { + printf("VMA is still lock on fault after unlock\n"); + return 1; + } + + return 0; +} + +static int test_mlock_onfault() +{ + char *map; + int ret = 1; + unsigned long page_size = getpagesize(); + + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); + if (map == MAP_FAILED) { + perror("test_mlock_locked mmap"); + goto out; + } + + if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) { + if (errno == ENOSYS) { + printf("Cannot call new mlock family, skipping test\n"); + _exit(0); + } + perror("mlock2(MLOCK_ONFAULT)"); + goto unmap; + } + + if (onfault_check(map)) + goto unmap; + + /* Now unlock and recheck attributes */ + if (munlock(map, 2 * page_size)) { + if (errno == ENOSYS) { + printf("Cannot call new mlock family, skipping test\n"); + _exit(0); + } + perror("munlock()"); + goto unmap; + } + + ret = unlock_onfault_check(map); +unmap: + munmap(map, 2 * page_size); +out: + return ret; +} + +static int test_lock_onfault_of_present() +{ + char *map; + int ret = 1; + unsigned long page_size = getpagesize(); + uint64_t page1_flags, page2_flags; + + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); + if (map == MAP_FAILED) { + perror("test_mlock_locked mmap"); + goto out; + } + + *map = 'a'; + + if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) { + if (errno == ENOSYS) { + printf("Cannot call new mlock family, skipping test\n"); + _exit(0); + } + perror("mlock2(MLOCK_ONFAULT)"); + goto unmap; + } + + page1_flags = get_pageflags((unsigned long)map); + page2_flags = get_pageflags((unsigned long)map + page_size); + page1_flags = get_kpageflags(page1_flags & PFN_MASK); + page2_flags = get_kpageflags(page2_flags & PFN_MASK); + + /* Page 1 should be unevictable */ + if ((page1_flags & UNEVICTABLE_BIT) == 0) { + printf("Failed to make present page unevictable\n"); + goto unmap; + } + + if (!is_vma_lock_on_fault((unsigned long)map) || + !is_vma_lock_on_fault((unsigned long)map + page_size)) { + printf("VMA with present pages is not marked lock on fault\n"); + goto unmap; + } + ret = 0; +unmap: + munmap(map, 2 * page_size); +out: + return ret; +} + +static int test_munlockall() +{ + char *map; + int ret = 1; + unsigned long page_size = getpagesize(); + + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); + + if (map == MAP_FAILED) { + perror("test_munlockall mmap"); + goto out; + } + + if (mlockall(MCL_CURRENT)) { + perror("mlockall(MCL_CURRENT)"); + goto out; + } + + if (lock_check(map)) + goto unmap; + + if (munlockall()) { + perror("munlockall()"); + goto unmap; + } + + if (unlock_lock_check(map)) + goto unmap; + + munmap(map, 2 * page_size); + + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); + + if (map == MAP_FAILED) { + perror("test_munlockall second mmap"); + goto out; + } + + if (mlockall(MCL_CURRENT | MCL_ONFAULT)) { + perror("mlockall(MCL_CURRENT | MCL_ONFAULT)"); + goto unmap; + } + + if (onfault_check(map)) + goto unmap; + + if (munlockall()) { + perror("munlockall()"); + goto unmap; + } + + if (unlock_onfault_check(map)) + goto unmap; + + if (mlockall(MCL_CURRENT | MCL_FUTURE)) { + perror("mlockall(MCL_CURRENT | MCL_FUTURE)"); + goto out; + } + + if (lock_check(map)) + goto unmap; + + if (munlockall()) { + perror("munlockall()"); + goto unmap; + } + + ret = unlock_lock_check(map); + +unmap: + munmap(map, 2 * page_size); +out: + munlockall(); + return ret; +} + +static int test_vma_management(bool call_mlock) +{ + int ret = 1; + void *map; + unsigned long page_size = getpagesize(); + struct vm_boundaries page1; + struct vm_boundaries page2; + struct vm_boundaries page3; + + map = mmap(NULL, 3 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); + if (map == MAP_FAILED) { + perror("mmap()"); + return ret; + } + + if (call_mlock && mlock2_(map, 3 * page_size, MLOCK_ONFAULT)) { + if (errno == ENOSYS) { + printf("Cannot call new mlock family, skipping test\n"); + _exit(0); + } + perror("mlock(ONFAULT)\n"); + goto out; + } + + if (get_vm_area((unsigned long)map, &page1) || + get_vm_area((unsigned long)map + page_size, &page2) || + get_vm_area((unsigned long)map + page_size * 2, &page3)) { + printf("couldn't find mapping in /proc/self/maps\n"); + goto out; + } + + /* + * Before we unlock a portion, we need to that all three pages are in + * the same VMA. If they are not we abort this test (Note that this is + * not a failure) + */ + if (page1.start != page2.start || page2.start != page3.start) { + printf("VMAs are not merged to start, aborting test\n"); + ret = 0; + goto out; + } + + if (munlock(map + page_size, page_size)) { + perror("munlock()"); + goto out; + } + + if (get_vm_area((unsigned long)map, &page1) || + get_vm_area((unsigned long)map + page_size, &page2) || + get_vm_area((unsigned long)map + page_size * 2, &page3)) { + printf("couldn't find mapping in /proc/self/maps\n"); + goto out; + } + + /* All three VMAs should be different */ + if (page1.start == page2.start || page2.start == page3.start) { + printf("failed to split VMA for munlock\n"); + goto out; + } + + /* Now unlock the first and third page and check the VMAs again */ + if (munlock(map, page_size * 3)) { + perror("munlock()"); + goto out; + } + + if (get_vm_area((unsigned long)map, &page1) || + get_vm_area((unsigned long)map + page_size, &page2) || + get_vm_area((unsigned long)map + page_size * 2, &page3)) { + printf("couldn't find mapping in /proc/self/maps\n"); + goto out; + } + + /* Now all three VMAs should be the same */ + if (page1.start != page2.start || page2.start != page3.start) { + printf("failed to merge VMAs after munlock\n"); + goto out; + } + + ret = 0; +out: + munmap(map, 3 * page_size); + return ret; +} + +static int test_mlockall(int (test_function)(bool call_mlock)) +{ + int ret = 1; + + if (mlockall(MCL_CURRENT | MCL_ONFAULT | MCL_FUTURE)) { + perror("mlockall"); + return ret; + } + + ret = test_function(false); + munlockall(); + return ret; +} + +int main(int argc, char **argv) +{ + int ret = 0; + ret += test_mlock_lock(); + ret += test_mlock_onfault(); + ret += test_munlockall(); + ret += test_lock_onfault_of_present(); + ret += test_vma_management(true); + ret += test_mlockall(test_vma_management); + return ret; +} diff --git a/tools/testing/selftests/vm/on-fault-limit.c b/tools/testing/selftests/vm/on-fault-limit.c new file mode 100644 index 000000000000..245acccce42d --- /dev/null +++ b/tools/testing/selftests/vm/on-fault-limit.c @@ -0,0 +1,47 @@ +#include <sys/mman.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <sys/time.h> +#include <sys/resource.h> + +#ifndef MCL_ONFAULT +#define MCL_ONFAULT (MCL_FUTURE << 1) +#endif + +static int test_limit(void) +{ + int ret = 1; + struct rlimit lims; + void *map; + + if (getrlimit(RLIMIT_MEMLOCK, &lims)) { + perror("getrlimit"); + return ret; + } + + if (mlockall(MCL_CURRENT | MCL_ONFAULT | MCL_FUTURE)) { + perror("mlockall"); + return ret; + } + + map = mmap(NULL, 2 * lims.rlim_max, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, 0, 0); + if (map != MAP_FAILED) + printf("mmap should have failed, but didn't\n"); + else { + ret = 0; + munmap(map, 2 * lims.rlim_max); + } + + munlockall(); + return ret; +} + +int main(int argc, char **argv) +{ + int ret = 0; + + ret += test_limit(); + return ret; +} diff --git a/tools/testing/selftests/vm/run_vmtests b/tools/testing/selftests/vm/run_vmtests index 9179ce8df485..2df21b3bb26d 100755 --- a/tools/testing/selftests/vm/run_vmtests +++ b/tools/testing/selftests/vm/run_vmtests @@ -106,4 +106,26 @@ else echo "[PASS]" fi +echo "--------------------" +echo "running on-fault-limit" +echo "--------------------" +sudo -u nobody ./on-fault-limit +if [ $? -ne 0 ]; then + echo "[FAIL]" + exitcode=1 +else + echo "[PASS]" +fi + +echo "--------------------" +echo "running mlock2-tests" +echo "--------------------" +./mlock2-tests +if [ $? -ne 0 ]; then + echo "[FAIL]" + exitcode=1 +else + echo "[PASS]" +fi + exit $exitcode diff --git a/tools/vm/slabinfo-gnuplot.sh b/tools/vm/slabinfo-gnuplot.sh new file mode 100644 index 000000000000..35b039864b77 --- /dev/null +++ b/tools/vm/slabinfo-gnuplot.sh @@ -0,0 +1,275 @@ +#!/bin/sh + +# Sergey Senozhatsky, 2015 +# sergey.senozhatsky.work@gmail.com +# +# This software is licensed under the terms of the GNU General Public +# License version 2, as published by the Free Software Foundation, and +# may be copied, distributed, and modified under those terms. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + + +# This program is intended to plot a `slabinfo -X' stats, collected, +# for example, using the following command: +# while [ 1 ]; do slabinfo -X >> stats; sleep 1; done +# +# Use `slabinfo-gnuplot.sh stats' to pre-process collected records +# and generate graphs (totals, slabs sorted by size, slabs sorted +# by size). +# +# Graphs can be [individually] regenerate with different ranges and +# size (-r %d,%d and -s %d,%d options). +# +# To visually compare N `totals' graphs, do +# slabinfo-gnuplot.sh -t FILE1-totals FILE2-totals ... FILEN-totals +# + +min_slab_name_size=11 +xmin=0 +xmax=0 +width=1500 +height=700 +mode=preprocess + +usage() +{ + echo "Usage: [-s W,H] [-r MIN,MAX] [-t|-l] FILE1 [FILE2 ..]" + echo "FILEs must contain 'slabinfo -X' samples" + echo "-t - plot totals for FILE(s)" + echo "-l - plot slabs stats for FILE(s)" + echo "-s %d,%d - set image width and height" + echo "-r %d,%d - use data samples from a given range" +} + +check_file_exist() +{ + if [ ! -f "$1" ]; then + echo "File '$1' does not exist" + exit 1 + fi +} + +do_slabs_plotting() +{ + local file=$1 + local out_file + local range="every ::$xmin" + local xtic="" + local xtic_rotate="norotate" + local lines=2000000 + local wc_lines + + check_file_exist "$file" + + out_file=`basename "$file"` + if [ $xmax -ne 0 ]; then + range="$range::$xmax" + lines=$((xmax-xmin)) + fi + + wc_lines=`cat "$file" | wc -l` + if [ $? -ne 0 ] || [ "$wc_lines" -eq 0 ] ; then + wc_lines=$lines + fi + + if [ "$wc_lines" -lt "$lines" ]; then + lines=$wc_lines + fi + + if [ $((width / lines)) -gt $min_slab_name_size ]; then + xtic=":xtic(1)" + xtic_rotate=90 + fi + +gnuplot -p << EOF +#!/usr/bin/env gnuplot + +set terminal png enhanced size $width,$height large +set output '$out_file.png' +set autoscale xy +set xlabel 'samples' +set ylabel 'bytes' +set style histogram columnstacked title textcolor lt -1 +set style fill solid 0.15 +set xtics rotate $xtic_rotate +set key left above Left title reverse + +plot "$file" $range u 2$xtic title 'SIZE' with boxes,\ + '' $range u 3 title 'LOSS' with boxes +EOF + + if [ $? -eq 0 ]; then + echo "$out_file.png" + fi +} + +do_totals_plotting() +{ + local gnuplot_cmd="" + local range="every ::$xmin" + local file="" + + if [ $xmax -ne 0 ]; then + range="$range::$xmax" + fi + + for i in "${t_files[@]}"; do + check_file_exist "$i" + + file="$file"`basename "$i"` + gnuplot_cmd="$gnuplot_cmd '$i' $range using 1 title\ + '$i Memory usage' with lines," + gnuplot_cmd="$gnuplot_cmd '' $range using 2 title \ + '$i Loss' with lines," + done + +gnuplot -p << EOF +#!/usr/bin/env gnuplot + +set terminal png enhanced size $width,$height large +set autoscale xy +set output '$file.png' +set xlabel 'samples' +set ylabel 'bytes' +set key left above Left title reverse + +plot $gnuplot_cmd +EOF + + if [ $? -eq 0 ]; then + echo "$file.png" + fi +} + +do_preprocess() +{ + local out + local lines + local in=$1 + + check_file_exist "$in" + + # use only 'TOP' slab (biggest memory usage or loss) + let lines=3 + out=`basename "$in"`"-slabs-by-loss" + `cat "$in" | grep -A "$lines" 'Slabs sorted by loss' |\ + egrep -iv '\-\-|Name|Slabs'\ + | awk '{print $1" "$4+$2*$3" "$4}' > "$out"` + if [ $? -eq 0 ]; then + do_slabs_plotting "$out" + fi + + let lines=3 + out=`basename "$in"`"-slabs-by-size" + `cat "$in" | grep -A "$lines" 'Slabs sorted by size' |\ + egrep -iv '\-\-|Name|Slabs'\ + | awk '{print $1" "$4" "$4-$2*$3}' > "$out"` + if [ $? -eq 0 ]; then + do_slabs_plotting "$out" + fi + + out=`basename "$in"`"-totals" + `cat "$in" | grep "Memory used" |\ + awk '{print $3" "$7}' > "$out"` + if [ $? -eq 0 ]; then + t_files[0]=$out + do_totals_plotting + fi +} + +parse_opts() +{ + local opt + + while getopts "tlr::s::h" opt; do + case $opt in + t) + mode=totals + ;; + l) + mode=slabs + ;; + s) + array=(${OPTARG//,/ }) + width=${array[0]} + height=${array[1]} + ;; + r) + array=(${OPTARG//,/ }) + xmin=${array[0]} + xmax=${array[1]} + ;; + h) + usage + exit 0 + ;; + \?) + echo "Invalid option: -$OPTARG" >&2 + exit 1 + ;; + :) + echo "-$OPTARG requires an argument." >&2 + exit 1 + ;; + esac + done + + return $OPTIND +} + +parse_args() +{ + local idx=0 + local p + + for p in "$@"; do + case $mode in + preprocess) + files[$idx]=$p + idx=$idx+1 + ;; + totals) + t_files[$idx]=$p + idx=$idx+1 + ;; + slabs) + files[$idx]=$p + idx=$idx+1 + ;; + esac + done +} + +parse_opts "$@" +argstart=$? +parse_args "${@:$argstart}" + +if [ ${#files[@]} -eq 0 ] && [ ${#t_files[@]} -eq 0 ]; then + usage + exit 1 +fi + +case $mode in + preprocess) + for i in "${files[@]}"; do + do_preprocess "$i" + done + ;; + totals) + do_totals_plotting + ;; + slabs) + for i in "${files[@]}"; do + do_slabs_plotting "$i" + done + ;; + *) + echo "Unknown mode $mode" >&2 + usage + exit 1 + ;; +esac diff --git a/tools/vm/slabinfo.c b/tools/vm/slabinfo.c index 808d5a9d5dcf..86e698d07e20 100644 --- a/tools/vm/slabinfo.c +++ b/tools/vm/slabinfo.c @@ -53,39 +53,43 @@ struct aliasinfo { struct slabinfo *slab; } aliasinfo[MAX_ALIASES]; -int slabs = 0; -int actual_slabs = 0; -int aliases = 0; -int alias_targets = 0; -int highest_node = 0; +int slabs; +int actual_slabs; +int aliases; +int alias_targets; +int highest_node; char buffer[4096]; -int show_empty = 0; -int show_report = 0; -int show_alias = 0; -int show_slab = 0; +int show_empty; +int show_report; +int show_alias; +int show_slab; int skip_zero = 1; -int show_numa = 0; -int show_track = 0; -int show_first_alias = 0; -int validate = 0; -int shrink = 0; -int show_inverted = 0; -int show_single_ref = 0; -int show_totals = 0; -int sort_size = 0; -int sort_active = 0; -int set_debug = 0; -int show_ops = 0; -int show_activity = 0; +int show_numa; +int show_track; +int show_first_alias; +int validate; +int shrink; +int show_inverted; +int show_single_ref; +int show_totals; +int sort_size; +int sort_active; +int set_debug; +int show_ops; +int show_activity; +int output_lines = -1; +int sort_loss; +int extended_totals; +int show_bytes; /* Debug options */ -int sanity = 0; -int redzone = 0; -int poison = 0; -int tracking = 0; -int tracing = 0; +int sanity; +int redzone; +int poison; +int tracking; +int tracing; int page_size; @@ -124,6 +128,10 @@ static void usage(void) "-v|--validate Validate slabs\n" "-z|--zero Include empty slabs\n" "-1|--1ref Single reference\n" + "-N|--lines=K Show the first K slabs\n" + "-L|--Loss Sort by loss\n" + "-X|--Xtotals Show extended summary information\n" + "-B|--Bytes Show size in bytes\n" "\nValid debug options (FZPUT may be combined)\n" "a / A Switch on all debug options (=FZUP)\n" "- Switch off all debug options\n" @@ -225,15 +233,17 @@ static int store_size(char *buffer, unsigned long value) char trailer = 0; int n; - if (value > 1000000000UL) { - divisor = 100000000UL; - trailer = 'G'; - } else if (value > 1000000UL) { - divisor = 100000UL; - trailer = 'M'; - } else if (value > 1000UL) { - divisor = 100; - trailer = 'K'; + if (!show_bytes) { + if (value > 1000000000UL) { + divisor = 100000000UL; + trailer = 'G'; + } else if (value > 1000000UL) { + divisor = 100000UL; + trailer = 'M'; + } else if (value > 1000UL) { + divisor = 100; + trailer = 'K'; + } } value /= divisor; @@ -297,10 +307,12 @@ int line = 0; static void first_line(void) { if (show_activity) - printf("Name Objects Alloc Free %%Fast Fallb O CmpX UL\n"); + printf("Name Objects Alloc Free" + " %%Fast Fallb O CmpX UL\n"); else - printf("Name Objects Objsize Space " - "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n"); + printf("Name Objects Objsize %s " + "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n", + sort_loss ? " Loss" : "Space"); } /* @@ -333,6 +345,11 @@ static unsigned long slab_activity(struct slabinfo *s) s->alloc_slowpath + s->free_slowpath; } +static unsigned long slab_waste(struct slabinfo *s) +{ + return slab_size(s) - s->objects * s->object_size; +} + static void slab_numa(struct slabinfo *s, int mode) { int node; @@ -504,7 +521,7 @@ static void report(struct slabinfo *s) if (strcmp(s->name, "*") == 0) return; - printf("\nSlabcache: %-20s Aliases: %2d Order : %2d Objects: %lu\n", + printf("\nSlabcache: %-15s Aliases: %2d Order : %2d Objects: %lu\n", s->name, s->aliases, s->order, s->objects); if (s->hwcache_align) printf("** Hardware cacheline aligned\n"); @@ -561,7 +578,10 @@ static void slabcache(struct slabinfo *s) if (show_empty && s->slabs) return; - store_size(size_str, slab_size(s)); + if (sort_loss == 0) + store_size(size_str, slab_size(s)); + else + store_size(size_str, slab_waste(s)); snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs - s->cpu_slabs, s->partial, s->cpu_slabs); @@ -602,15 +622,15 @@ static void slabcache(struct slabinfo *s) total_free ? (s->free_fastpath * 100 / total_free) : 0, s->order_fallback, s->order, s->cmpxchg_double_fail, s->cmpxchg_double_cpu_fail); - } - else - printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n", + } else { + printf("%-21s %8ld %7d %15s %14s %4d %1d %3ld %3ld %s\n", s->name, s->objects, s->object_size, size_str, dist_str, s->objs_per_slab, s->order, s->slabs ? (s->partial * 100) / s->slabs : 100, s->slabs ? (s->objects * s->object_size * 100) / (s->slabs * (page_size << s->order)) : 100, flags); + } } /* @@ -918,84 +938,88 @@ static void totals(void) printf("Slabcache Totals\n"); printf("----------------\n"); - printf("Slabcaches : %3d Aliases : %3d->%-3d Active: %3d\n", + printf("Slabcaches : %15d Aliases : %11d->%-3d Active: %3d\n", slabs, aliases, alias_targets, used_slabs); store_size(b1, total_size);store_size(b2, total_waste); store_size(b3, total_waste * 100 / total_used); - printf("Memory used: %6s # Loss : %6s MRatio:%6s%%\n", b1, b2, b3); + printf("Memory used: %15s # Loss : %15s MRatio:%6s%%\n", b1, b2, b3); store_size(b1, total_objects);store_size(b2, total_partobj); store_size(b3, total_partobj * 100 / total_objects); - printf("# Objects : %6s # PartObj: %6s ORatio:%6s%%\n", b1, b2, b3); + printf("# Objects : %15s # PartObj: %15s ORatio:%6s%%\n", b1, b2, b3); printf("\n"); - printf("Per Cache Average Min Max Total\n"); - printf("---------------------------------------------------------\n"); + printf("Per Cache Average " + "Min Max Total\n"); + printf("---------------------------------------" + "-------------------------------------\n"); store_size(b1, avg_objects);store_size(b2, min_objects); store_size(b3, max_objects);store_size(b4, total_objects); - printf("#Objects %10s %10s %10s %10s\n", + printf("#Objects %15s %15s %15s %15s\n", b1, b2, b3, b4); store_size(b1, avg_slabs);store_size(b2, min_slabs); store_size(b3, max_slabs);store_size(b4, total_slabs); - printf("#Slabs %10s %10s %10s %10s\n", + printf("#Slabs %15s %15s %15s %15s\n", b1, b2, b3, b4); store_size(b1, avg_partial);store_size(b2, min_partial); store_size(b3, max_partial);store_size(b4, total_partial); - printf("#PartSlab %10s %10s %10s %10s\n", + printf("#PartSlab %15s %15s %15s %15s\n", b1, b2, b3, b4); store_size(b1, avg_ppart);store_size(b2, min_ppart); store_size(b3, max_ppart); store_size(b4, total_partial * 100 / total_slabs); - printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n", + printf("%%PartSlab%15s%% %15s%% %15s%% %15s%%\n", b1, b2, b3, b4); store_size(b1, avg_partobj);store_size(b2, min_partobj); store_size(b3, max_partobj); store_size(b4, total_partobj); - printf("PartObjs %10s %10s %10s %10s\n", + printf("PartObjs %15s %15s %15s %15s\n", b1, b2, b3, b4); store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj); store_size(b3, max_ppartobj); store_size(b4, total_partobj * 100 / total_objects); - printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n", + printf("%% PartObj%15s%% %15s%% %15s%% %15s%%\n", b1, b2, b3, b4); store_size(b1, avg_size);store_size(b2, min_size); store_size(b3, max_size);store_size(b4, total_size); - printf("Memory %10s %10s %10s %10s\n", + printf("Memory %15s %15s %15s %15s\n", b1, b2, b3, b4); store_size(b1, avg_used);store_size(b2, min_used); store_size(b3, max_used);store_size(b4, total_used); - printf("Used %10s %10s %10s %10s\n", + printf("Used %15s %15s %15s %15s\n", b1, b2, b3, b4); store_size(b1, avg_waste);store_size(b2, min_waste); store_size(b3, max_waste);store_size(b4, total_waste); - printf("Loss %10s %10s %10s %10s\n", + printf("Loss %15s %15s %15s %15s\n", b1, b2, b3, b4); printf("\n"); - printf("Per Object Average Min Max\n"); - printf("---------------------------------------------\n"); + printf("Per Object Average " + "Min Max\n"); + printf("---------------------------------------" + "--------------------\n"); store_size(b1, avg_memobj);store_size(b2, min_memobj); store_size(b3, max_memobj); - printf("Memory %10s %10s %10s\n", + printf("Memory %15s %15s %15s\n", b1, b2, b3); store_size(b1, avg_objsize);store_size(b2, min_objsize); store_size(b3, max_objsize); - printf("User %10s %10s %10s\n", + printf("User %15s %15s %15s\n", b1, b2, b3); store_size(b1, avg_objwaste);store_size(b2, min_objwaste); store_size(b3, max_objwaste); - printf("Loss %10s %10s %10s\n", + printf("Loss %15s %15s %15s\n", b1, b2, b3); } @@ -1011,6 +1035,8 @@ static void sort_slabs(void) result = slab_size(s1) < slab_size(s2); else if (sort_active) result = slab_activity(s1) < slab_activity(s2); + else if (sort_loss) + result = slab_waste(s1) < slab_waste(s2); else result = strcasecmp(s1->name, s2->name); @@ -1095,7 +1121,7 @@ static void alias(void) active = a->slab->name; } else - printf("%-20s -> %s\n", a->name, a->slab->name); + printf("%-15s -> %s\n", a->name, a->slab->name); } if (active) printf("\n"); @@ -1241,12 +1267,16 @@ static void read_slab_dir(void) static void output_slabs(void) { struct slabinfo *slab; + int lines = output_lines; - for (slab = slabinfo; slab < slabinfo + slabs; slab++) { + for (slab = slabinfo; (slab < slabinfo + slabs) && + lines != 0; slab++) { if (slab->alias) continue; + if (lines != -1) + lines--; if (show_numa) slab_numa(slab, 0); @@ -1267,24 +1297,54 @@ static void output_slabs(void) } } +static void xtotals(void) +{ + totals(); + + link_slabs(); + rename_slabs(); + + printf("\nSlabs sorted by size\n"); + printf("--------------------\n"); + sort_loss = 0; + sort_size = 1; + sort_slabs(); + output_slabs(); + + printf("\nSlabs sorted by loss\n"); + printf("--------------------\n"); + line = 0; + sort_loss = 1; + sort_size = 0; + sort_slabs(); + output_slabs(); + printf("\n"); +} + struct option opts[] = { - { "aliases", 0, NULL, 'a' }, - { "activity", 0, NULL, 'A' }, - { "debug", 2, NULL, 'd' }, - { "display-activity", 0, NULL, 'D' }, - { "empty", 0, NULL, 'e' }, - { "first-alias", 0, NULL, 'f' }, - { "help", 0, NULL, 'h' }, - { "inverted", 0, NULL, 'i'}, - { "numa", 0, NULL, 'n' }, - { "ops", 0, NULL, 'o' }, - { "report", 0, NULL, 'r' }, - { "shrink", 0, NULL, 's' }, - { "slabs", 0, NULL, 'l' }, - { "track", 0, NULL, 't'}, - { "validate", 0, NULL, 'v' }, - { "zero", 0, NULL, 'z' }, - { "1ref", 0, NULL, '1'}, + { "aliases", no_argument, NULL, 'a' }, + { "activity", no_argument, NULL, 'A' }, + { "debug", optional_argument, NULL, 'd' }, + { "display-activity", no_argument, NULL, 'D' }, + { "empty", no_argument, NULL, 'e' }, + { "first-alias", no_argument, NULL, 'f' }, + { "help", no_argument, NULL, 'h' }, + { "inverted", no_argument, NULL, 'i'}, + { "slabs", no_argument, NULL, 'l' }, + { "numa", no_argument, NULL, 'n' }, + { "ops", no_argument, NULL, 'o' }, + { "shrink", no_argument, NULL, 's' }, + { "report", no_argument, NULL, 'r' }, + { "Size", no_argument, NULL, 'S'}, + { "tracking", no_argument, NULL, 't'}, + { "Totals", no_argument, NULL, 'T'}, + { "validate", no_argument, NULL, 'v' }, + { "zero", no_argument, NULL, 'z' }, + { "1ref", no_argument, NULL, '1'}, + { "lines", required_argument, NULL, 'N'}, + { "Loss", no_argument, NULL, 'L'}, + { "Xtotals", no_argument, NULL, 'X'}, + { "Bytes", no_argument, NULL, 'B'}, { NULL, 0, NULL, 0 } }; @@ -1296,7 +1356,7 @@ int main(int argc, char *argv[]) page_size = getpagesize(); - while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS", + while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:LXB", opts, NULL)) != -1) switch (c) { case '1': @@ -1358,7 +1418,25 @@ int main(int argc, char *argv[]) case 'S': sort_size = 1; break; - + case 'N': + if (optarg) { + output_lines = atoi(optarg); + if (output_lines < 1) + output_lines = 1; + } + break; + case 'L': + sort_loss = 1; + break; + case 'X': + if (output_lines == -1) + output_lines = 1; + extended_totals = 1; + show_bytes = 1; + break; + case 'B': + show_bytes = 1; + break; default: fatal("%s: Invalid option '%c'\n", argv[0], optopt); @@ -1378,12 +1456,13 @@ int main(int argc, char *argv[]) fatal("%s: Invalid pattern '%s' code %d\n", argv[0], pattern_source, err); read_slab_dir(); - if (show_alias) + if (show_alias) { alias(); - else - if (show_totals) + } else if (extended_totals) { + xtotals(); + } else if (show_totals) { totals(); - else { + } else { link_slabs(); rename_slabs(); sort_slabs(); |