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author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-13 13:00:36 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-13 13:00:36 -0800 |
commit | 78a45c6f067824cf5d0a9fedea7339ac2e28603c (patch) | |
tree | b4f78c8b6b9059ddace0a18c11629b8d2045f793 /mm/migrate.c | |
parent | f96fe225677b3efb74346ebd56fafe3997b02afa (diff) | |
parent | 29d293b6007b91a4463f05bc8d0b26e0e65c5816 (diff) | |
download | linux-stable-78a45c6f067824cf5d0a9fedea7339ac2e28603c.tar.gz linux-stable-78a45c6f067824cf5d0a9fedea7339ac2e28603c.tar.bz2 linux-stable-78a45c6f067824cf5d0a9fedea7339ac2e28603c.zip |
Merge branch 'akpm' (second patch-bomb from Andrew)
Merge second patchbomb from Andrew Morton:
- the rest of MM
- misc fs fixes
- add execveat() syscall
- new ratelimit feature for fault-injection
- decompressor updates
- ipc/ updates
- fallocate feature creep
- fsnotify cleanups
- a few other misc things
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (99 commits)
cgroups: Documentation: fix trivial typos and wrong paragraph numberings
parisc: percpu: update comments referring to __get_cpu_var
percpu: update local_ops.txt to reflect this_cpu operations
percpu: remove __get_cpu_var and __raw_get_cpu_var macros
fsnotify: remove destroy_list from fsnotify_mark
fsnotify: unify inode and mount marks handling
fallocate: create FAN_MODIFY and IN_MODIFY events
mm/cma: make kmemleak ignore CMA regions
slub: fix cpuset check in get_any_partial
slab: fix cpuset check in fallback_alloc
shmdt: use i_size_read() instead of ->i_size
ipc/shm.c: fix overly aggressive shmdt() when calls span multiple segments
ipc/msg: increase MSGMNI, remove scaling
ipc/sem.c: increase SEMMSL, SEMMNI, SEMOPM
ipc/sem.c: change memory barrier in sem_lock() to smp_rmb()
lib/decompress.c: consistency of compress formats for kernel image
decompress_bunzip2: off by one in get_next_block()
usr/Kconfig: make initrd compression algorithm selection not expert
fault-inject: add ratelimit option
ratelimit: add initialization macro
...
Diffstat (limited to 'mm/migrate.c')
-rw-r--r-- | mm/migrate.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 01439953abf5..253474c22239 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -746,7 +746,7 @@ 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 remap_swapcache, enum migrate_mode mode) + int page_was_mapped, enum migrate_mode mode) { struct address_space *mapping; int rc; @@ -784,7 +784,7 @@ static int move_to_new_page(struct page *newpage, struct page *page, newpage->mapping = NULL; } else { mem_cgroup_migrate(page, newpage, false); - if (remap_swapcache) + if (page_was_mapped) remove_migration_ptes(page, newpage); page->mapping = NULL; } @@ -798,7 +798,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage, int force, enum migrate_mode mode) { int rc = -EAGAIN; - int remap_swapcache = 1; + int page_was_mapped = 0; struct anon_vma *anon_vma = NULL; if (!trylock_page(page)) { @@ -870,7 +870,6 @@ static int __unmap_and_move(struct page *page, struct page *newpage, * migrated but are not remapped when migration * completes */ - remap_swapcache = 0; } else { goto out_unlock; } @@ -910,13 +909,17 @@ static int __unmap_and_move(struct page *page, struct page *newpage, } /* Establish migration ptes or remove ptes */ - try_to_unmap(page, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); + if (page_mapped(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, remap_swapcache, mode); + rc = move_to_new_page(newpage, page, page_was_mapped, mode); - if (rc && remap_swapcache) + if (rc && page_was_mapped) remove_migration_ptes(page, page); /* Drop an anon_vma reference if we took one */ @@ -1017,6 +1020,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page, { int rc = 0; int *result = NULL; + int page_was_mapped = 0; struct page *new_hpage; struct anon_vma *anon_vma = NULL; @@ -1047,12 +1051,16 @@ static int unmap_and_move_huge_page(new_page_t get_new_page, if (PageAnon(hpage)) anon_vma = page_get_anon_vma(hpage); - try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); + if (page_mapped(hpage)) { + try_to_unmap(hpage, + TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS); + page_was_mapped = 1; + } if (!page_mapped(hpage)) - rc = move_to_new_page(new_hpage, hpage, 1, mode); + rc = move_to_new_page(new_hpage, hpage, page_was_mapped, mode); - if (rc != MIGRATEPAGE_SUCCESS) + if (rc != MIGRATEPAGE_SUCCESS && page_was_mapped) remove_migration_ptes(hpage, hpage); if (anon_vma) |