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* mm: dynamically allocate page->ptl if it cannot be embedded to struct pageKirill A. Shutemov2013-11-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | If split page table lock is in use, we embed the lock into struct page of table's page. We have to disable split lock, if spinlock_t is too big be to be embedded, like when DEBUG_SPINLOCK or DEBUG_LOCK_ALLOC enabled. This patch add support for dynamic allocation of split page table lock if we can't embed it to struct page. page->ptl is unsigned long now and we use it as spinlock_t if sizeof(spinlock_t) <= sizeof(long), otherwise it's pointer to spinlock_t. The spinlock_t allocated in pgtable_page_ctor() for PTE table and in pgtable_pmd_page_ctor() for PMD table. All other helpers converted to support dynamically allocated page->ptl. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xtensa: use buddy allocator for PTE tableKirill A. Shutemov2013-11-153-30/+13
| | | | | | | | | | | | | At the moment xtensa uses slab allocator for PTE table. It doesn't work with enabled split page table lock: slab uses page->slab_cache and page->first_page for its pages. These fields share stroage with page->ptl. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Chris Zankel <chris@zankel.net> Acked-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xtensa: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+4
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* x86: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-2/+6
| | | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* unicore32: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-6/+8
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-2/+6
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tile: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+5
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sparc: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-152-6/+10
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sh: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+4
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* score: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-3/+6
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Acked-by: Lennox Wu <lennox.wu@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* s390: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-2/+9
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* powerpc: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-153-5/+12
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* parisc: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-2/+6
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mips: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-3/+6
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* metag: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-2/+6
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: James Hogan <james.hogan@imgtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* m68k: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-153-3/+14
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* m32r: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+4
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ia64: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+4
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* hexagon: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-4/+6
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Richard Kuo <rkuo@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* frv: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-4/+8
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* cris: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+4
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mikael Starvik <starvik@axis.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* avr32: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+4
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* arm64: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-3/+6
| | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* arm: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-5/+7
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* arc: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-3/+8
| | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> [for arch/arc bits] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* alpha: handle pgtable_page_ctor() failKirill A. Shutemov2013-11-151-1/+4
| | | | | | | | | Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* openrisc: add missing pgtable_page_ctor/dtor callsKirill A. Shutemov2013-11-151-2/+8
| | | | | | | | | | It will fix NR_PAGETABLE accounting. It's also required if the arch is going ever support split ptl. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Jonas Bonn <jonas@southpole.se> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mn10300: add missing pgtable_page_ctor/dtor callsKirill A. Shutemov2013-11-152-2/+8
| | | | | | | | | | | It will fix NR_PAGETABLE accounting. It's also required if the arch is going ever support split ptl. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* microblaze: add missing pgtable_page_ctor/dtor callsKirill A. Shutemov2013-11-151-3/+9
| | | | | | | | | | It will fix NR_PAGETABLE accounting. It's also required if the arch is going ever support split ptl. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Michal Simek <monstr@monstr.eu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xtensa: fix potential NULL-pointer dereferenceKirill A. Shutemov2013-11-151-1/+5
| | | | | | | | | | Add missing check for memory allocation fail. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* m32r: fix potential NULL-pointer dereferenceKirill A. Shutemov2013-11-151-0/+2
| | | | | | | | | Add missing check for memory allocation fail. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* cris: fix potential NULL-pointer dereferenceKirill A. Shutemov2013-11-151-0/+2
| | | | | | | | | | Add missing check for memory allocation fail. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mikael Starvik <starvik@axis.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* x86: add missed pgtable_pmd_page_ctor/dtor calls for preallocated pmdsKirill A. Shutemov2013-11-151-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In split page table lock case, we embed spinlock_t into struct page. For obvious reason, we don't want to increase size of struct page if spinlock_t is too big, like with DEBUG_SPINLOCK or DEBUG_LOCK_ALLOC or on -rt kernel. So we disable split page table lock, if spinlock_t is too big. This patchset allows to allocate the lock dynamically if spinlock_t is big. In this page->ptl is used to store pointer to spinlock instead of spinlock itself. It costs additional cache line for indirect access, but fix page fault scalability for multi-threaded applications. LOCK_STAT depends on DEBUG_SPINLOCK, so on current kernel enabling LOCK_STAT to analyse scalability issues breaks scalability. ;) The patchset mostly fixes this. Results for ./thp_memscale -c 80 -b 512M on 4-socket machine: baseline, no CONFIG_LOCK_STAT: 9.115460703 seconds time elapsed baseline, CONFIG_LOCK_STAT=y: 53.890567123 seconds time elapsed patched, no CONFIG_LOCK_STAT: 8.852250368 seconds time elapsed patched, CONFIG_LOCK_STAT=y: 11.069770759 seconds time elapsed Patch count is scary, but most of them trivial. Overview: Patches 1-4 Few bug fixes. No dependencies to other patches. Probably should applied as soon as possible. Patch 5 Changes signature of pgtable_page_ctor(). We will use it for dynamic lock allocation, so it can fail. Patches 6-8 Add missing constructor/destructor calls on few archs. It's fixes NR_PAGETABLE accounting and prepare to use split ptl. Patches 9-33 Add pgtable_page_ctor() fail handling to all archs. Patches 34 Finally adds support of dynamically-allocated page->pte. Also contains documentation for split page table lock. This patch (of 34): I've missed that we preallocate few pmds on pgd_alloc() if X86_PAE enabled. Let's add missed constructor/destructor calls. I haven't noticed it during testing since prep_new_page() clears page->mapping and therefore page->ptl. It's effectively equal to spin_lock_init(&page->ptl). Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Chris Zankel <chris@zankel.net> Cc: Christoph Lameter <cl@linux.com> Cc: David Howells <dhowells@redhat.com> Cc: David S. Miller <davem@davemloft.net> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Grant Likely <grant.likely@linaro.org> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: James Hogan <james.hogan@imgtec.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Mikael Starvik <starvik@axis.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* x86, mm: enable split page table lock for PMD levelKirill A. Shutemov2013-11-152-1/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Enable PMD split page table lock for X86_64 and PAE. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Alex Thorlton <athorlton@sgi.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Eric W . Biederman" <ebiederm@xmission.com> Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Jones <davej@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kees Cook <keescook@chromium.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Robin Holt <robinmholt@gmail.com> Cc: Sedat Dilek <sedat.dilek@gmail.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Hugh Dickins <hughd@google.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm, thp: do not access mm->pmd_huge_pte directlyKirill A. Shutemov2013-11-152-12/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently mm->pmd_huge_pte protected by page table lock. It will not work with split lock. We have to have per-pmd pmd_huge_pte for proper access serialization. For now, let's just introduce wrapper to access mm->pmd_huge_pte. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Alex Thorlton <athorlton@sgi.com> Cc: Alex Thorlton <athorlton@sgi.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Eric W . Biederman" <ebiederm@xmission.com> Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Jones <davej@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kees Cook <keescook@chromium.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Robin Holt <robinmholt@gmail.com> Cc: Sedat Dilek <sedat.dilek@gmail.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: rename USE_SPLIT_PTLOCKS to USE_SPLIT_PTE_PTLOCKSKirill A. Shutemov2013-11-152-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We're going to introduce split page table lock for PMD level. Let's rename existing split ptlock for PTE level to avoid confusion. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Alex Thorlton <athorlton@sgi.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Eric W . Biederman" <ebiederm@xmission.com> Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dave Jones <davej@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kees Cook <keescook@chromium.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Robin Holt <robinmholt@gmail.com> Cc: Sedat Dilek <sedat.dilek@gmail.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds2013-11-146-8/+13
|\ | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull two x86 fixes from Ingo Molnar. * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/microcode/amd: Tone down printk(), don't treat a missing firmware file as an error x86/dumpstack: Fix printk_address for direct addresses
| * x86/microcode/amd: Tone down printk(), don't treat a missing firmware file ↵Thomas Renninger2013-11-121-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | as an error Do it the same way as done in microcode_intel.c: use pr_debug() for missing firmware files. There seem to be CPUs out there for which no microcode update has been submitted to kernel-firmware repo yet resulting in scary sounding error messages in dmesg: microcode: failed to load file amd-ucode/microcode_amd_fam16h.bin Signed-off-by: Thomas Renninger <trenn@suse.de> Acked-by: Borislav Petkov <bp@suse.de> Cc: <stable@kernel.org> Link: http://lkml.kernel.org/r/1384274383-43510-1-git-send-email-trenn@suse.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * x86/dumpstack: Fix printk_address for direct addressesJiri Slaby2013-11-125-7/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Consider a kernel crash in a module, simulated the following way: static int my_init(void) { char *map = (void *)0x5; *map = 3; return 0; } module_init(my_init); When we turn off FRAME_POINTERs, the very first instruction in that function causes a BUG. The problem is that we print IP in the BUG report using %pB (from printk_address). And %pB decrements the pointer by one to fix printing addresses of functions with tail calls. This was added in commit 71f9e59800e5ad4 ("x86, dumpstack: Use %pB format specifier for stack trace") to fix the call stack printouts. So instead of correct output: BUG: unable to handle kernel NULL pointer dereference at 0000000000000005 IP: [<ffffffffa01ac000>] my_init+0x0/0x10 [pb173] We get: BUG: unable to handle kernel NULL pointer dereference at 0000000000000005 IP: [<ffffffffa0152000>] 0xffffffffa0151fff To fix that, we use %pS only for stack addresses printouts (via newly added printk_stack_address) and %pB for regs->ip (via printk_address). I.e. we revert to the old behaviour for all except call stacks. And since from all those reliable is 1, we remove that parameter from printk_address. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: joe@perches.com Cc: jirislaby@gmail.com Link: http://lkml.kernel.org/r/1382706418-8435-1-git-send-email-jslaby@suse.cz Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | Merge branch 'core-locking-for-linus' of ↵Linus Torvalds2013-11-143-18/+7
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull core locking changes from Ingo Molnar: "The biggest changes: - add lockdep support for seqcount/seqlocks structures, this unearthed both bugs and required extra annotation. - move the various kernel locking primitives to the new kernel/locking/ directory" * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits) block: Use u64_stats_init() to initialize seqcounts locking/lockdep: Mark __lockdep_count_forward_deps() as static lockdep/proc: Fix lock-time avg computation locking/doc: Update references to kernel/mutex.c ipv6: Fix possible ipv6 seqlock deadlock cpuset: Fix potential deadlock w/ set_mems_allowed seqcount: Add lockdep functionality to seqcount/seqlock structures net: Explicitly initialize u64_stats_sync structures for lockdep locking: Move the percpu-rwsem code to kernel/locking/ locking: Move the lglocks code to kernel/locking/ locking: Move the rwsem code to kernel/locking/ locking: Move the rtmutex code to kernel/locking/ locking: Move the semaphore core to kernel/locking/ locking: Move the spinlock code to kernel/locking/ locking: Move the lockdep code to kernel/locking/ locking: Move the mutex code to kernel/locking/ hung_task debugging: Add tracepoint to report the hang x86/locking/kconfig: Update paravirt spinlock Kconfig description lockstat: Report avg wait and hold times lockdep, x86/alternatives: Drop ancient lockdep fixup message ...
| * | seqcount: Add lockdep functionality to seqcount/seqlock structuresJohn Stultz2013-11-061-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently seqlocks and seqcounts don't support lockdep. After running across a seqcount related deadlock in the timekeeping code, I used a less-refined and more focused variant of this patch to narrow down the cause of the issue. This is a first-pass attempt to properly enable lockdep functionality on seqlocks and seqcounts. Since seqcounts are used in the vdso gettimeofday code, I've provided non-lockdep accessors for those needs. I've also handled one case where there were nested seqlock writers and there may be more edge cases. Comments and feedback would be appreciated! Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Li Zefan <lizefan@huawei.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/1381186321-4906-3-git-send-email-john.stultz@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | Merge branch 'sched/core' into core/locking, to prepare the kernel/locking/ ↵Ingo Molnar2013-11-0653-126/+322
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | file move Conflicts: kernel/Makefile There are conflicts in kernel/Makefile due to file moving in the scheduler tree - resolve them. Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * \ \ Merge tag 'v3.12' into core/locking to pick up mutex upatesIngo Molnar2013-11-06201-737/+1267
| |\ \ \ | | | | | | | | | | | | | | | Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | | | x86/locking/kconfig: Update paravirt spinlock Kconfig descriptionRaghavendra K T2013-10-261-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since the paravirt spinlock optimizations went into the v3.12 kernel we have a very good performance benefit for paravirtualized KVM / Xen kernels. Also we no longer suffer from 5% side effect on native kernel that is mentioned in the Kconfig entry. So update the Kconfig entry accordingly. pvspinlock benefit on KVM link: https://lkml.org/lkml/2013/8/6/178 Attilio's tests on native kernel impact: http://blog.xen.org/index.php/2012/05/11/benchmarking-the-new-pv-ticketlock-implementation/ Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: <konrad.wilk@oracle.com> Cc: <linux@eikelenboom.it> Cc: <gleb@redhat.com> Cc: <pbonzini@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1382371508-3843-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com [ Updated the changelog. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | | | lockdep, x86/alternatives: Drop ancient lockdep fixup messageBorislav Petkov2013-09-281-11/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It messes up the output of the nodes/cores bootup table and it is obsolete anyway, see 17abecfe651c x86: fix up alternatives with lockdep enabled Signed-off-by: Borislav Petkov <bp@suse.de> Cc: huawei.libin@huawei.com Cc: wangyijing@huawei.com Cc: fenghua.yu@intel.com Cc: guohanjun@huawei.com Cc: paul.gortmaker@windriver.com Link: http://lkml.kernel.org/r/20130927143442.GE4422@pd.tnic Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | | | | Merge branch 'x86-trace-for-linus' of ↵Linus Torvalds2013-11-1412-50/+165
|\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86/trace changes from Ingo Molnar: "This adds page fault tracepoints which have zero runtime cost in the disabled case via IDT trickery (no NOPs in the page fault hotpath)" * 'x86-trace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, trace: Change user|kernel_page_fault to page_fault_user|kernel x86, trace: Add page fault tracepoints x86, trace: Delete __trace_alloc_intr_gate() x86, trace: Register exception handler to trace IDT x86, trace: Remove __alloc_intr_gate()
| * | | | | x86, trace: Change user|kernel_page_fault to page_fault_user|kernelH. Peter Anvin2013-11-112-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Tracepoints are named hierachially, and it makes more sense to keep a general flow of information level from general to specific from left to right, i.e. x86_exceptions.page_fault_user|kernel rather than x86_exceptions.user|kernel_page_fault Suggested-by: Ingo Molnar <mingo@kernel.org> Acked-by: Seiji Aguchi <seiji.aguchi@hds.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Link: http://lkml.kernel.org/r/20131111082955.GB12405@gmail.com
| * | | | | x86, trace: Add page fault tracepointsSeiji Aguchi2013-11-083-0/+67
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch introduces page fault tracepoints to x86 architecture by switching IDT. Two events, for user and kernel spaces, are introduced at the beginning of page fault handler for tracing. - User space event There is a request of page fault event for user space as below. https://lkml.kernel.org/r/1368079520-11015-2-git-send-email-fdeslaur+()+gmail+!+com https://lkml.kernel.org/r/1368079520-11015-1-git-send-email-fdeslaur+()+gmail+!+com - Kernel space event: When we measure an overhead in kernel space for investigating performance issues, we can check if it comes from the page fault events. Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Link: http://lkml.kernel.org/r/52716E67.6090705@hds.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | x86, trace: Delete __trace_alloc_intr_gate()Seiji Aguchi2013-11-081-22/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently irq vector handlers for tracing are registered in both set_intr_gate() and __trace_alloc_intr_gate() in alloc_intr_gate(). But, we don't need to do that twice. So, let's delete __trace_alloc_intr_gate(). Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Link: http://lkml.kernel.org/r/52716E1B.7090205@hds.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | | | | x86, trace: Register exception handler to trace IDTSeiji Aguchi2013-11-0810-22/+97
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch registers exception handlers for tracing to a trace IDT. To implemented it in set_intr_gate(), this patch does followings. - Register the exception handlers to the trace IDT by prepending "trace_" to the handler's names. - Also, newly introduce trace_page_fault() to add tracepoints in a subsequent patch. Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Link: http://lkml.kernel.org/r/52716DEC.5050204@hds.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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