From: Michal Hocko <mhocko@kernel.org> To: LKML <linux-kernel@vger.kernel.org> Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, "David S. Miller" <davem@davemloft.net>, Tony Luck <tony.luck@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Chris Zankel <chris@zankel.net>, Max Filippov <jcmvbkbc@gmail.com>, x86@kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org Subject: [PATCH 0/11] introduce down_write_killable for rw_semaphore v2 Date: Fri, 01 Apr 2016 11:04:44 +0000 [thread overview] Message-ID: <1459508695-14915-1-git-send-email-mhocko@kernel.org> (raw) In-Reply-To: <1456750705-7141-1-git-send-email-mhocko@kernel.org> Hi, the following patchset implements a killable variant of write lock for rw_semaphore. My usecase is to turn as many mmap_sem write users to use a killable variant which will be helpful for the oom_reaper merged in 4.6-rc1 (aac453635549 ("mm, oom: introduce oom reaper")) to asynchronously tear down the oom victim address space which requires mmap_sem for read. This will reduce a likelihood of OOM livelocks caused by oom victim being stuck on a lock or other resource which prevents it to reach its exit path and release the memory. I haven't implemented the killable variant of the read lock because I do not have any usecase for this API. The previous version of this series was posted [1] and the only change since than was the rebase on top of 4.5 (with a clean merge to 4.6-rc1) and Patch3 was updated to only check for fatal signals when the caller would block - aka trylock will get the lock even when signals are pending to be in sync with mutex implementation as per Peter Zijlstra. The patchset is organized as follows. - Patch 1 is a trivial cleanup - Patch 2, I belive, shouldn't introduce any functional changes as per Documentation/memory-barriers.txt. - Patch 3 is the preparatory work and necessary infrastructure for down_write_killable. It implements generic __down_write_killable and prepares the write lock slow path to bail out earlier when told so - Patch 4-1 are implementing arch specific __down_write_killable. One patch per architecture. - finally patch 11 implements down_write_killable and ties everything together. I am not really an expert on lockdep so I hope I got it right. Follow up patches to change mmap_sem write users to killable form is not part of the series because that will be routed via mmotm tree later on. I have tested on x86 with OOM situations with high mmap_sem contention (basically many parallel page faults racing with many parallel mmap/munmap tight loops) so the waiters for the write locks are routinely interrupted by SIGKILL. Thanks! Shortlog says: Michal Hocko (11): locking, rwsem: get rid of __down_write_nested locking, rwsem: drop explicit memory barriers locking, rwsem: introduce basis for down_write_killable alpha, rwsem: provide __down_write_killable ia64, rwsem: provide __down_write_killable s390, rwsem: provide __down_write_killable sh, rwsem: provide __down_write_killable sparc, rwsem: provide __down_write_killable xtensa, rwsem: provide __down_write_killable x86, rwsem: provide __down_write_killable locking, rwsem: provide down_write_killable And diffstat: arch/alpha/include/asm/rwsem.h | 18 ++++++++++++++++-- arch/ia64/include/asm/rwsem.h | 22 ++++++++++++++++++--- arch/s390/include/asm/rwsem.h | 18 ++++++++++++++---- arch/sh/include/asm/rwsem.h | 32 +++++++++++++++---------------- arch/sparc/include/asm/rwsem.h | 14 +++++++++++--- arch/x86/include/asm/rwsem.h | 42 +++++++++++++++++++++++++---------------- arch/x86/lib/rwsem.S | 8 ++++++++ arch/xtensa/include/asm/rwsem.h | 27 ++++++++++++++------------ include/asm-generic/rwsem.h | 13 ++++++++++--- include/linux/lockdep.h | 15 +++++++++++++++ include/linux/rwsem-spinlock.h | 2 +- include/linux/rwsem.h | 3 +++ kernel/locking/rwsem-spinlock.c | 19 ++++++++++++++++--- kernel/locking/rwsem-xadd.c | 31 ++++++++++++++++++++++++------ kernel/locking/rwsem.c | 19 +++++++++++++++++++ 15 files changed, 213 insertions(+), 70 deletions(-) --- [1] http://lkml.kernel.org/r/1456750705-7141-1-git-send-email-mhocko@kernel.org
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org> To: LKML <linux-kernel@vger.kernel.org> Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, "David S. Miller" <davem@davemloft.net>, Tony Luck <tony.luck@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Chris Zankel <chris@zankel.net>, Max Filippov <jcmvbkbc@gmail.com>, x86@kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org Subject: [PATCH 0/11] introduce down_write_killable for rw_semaphore v2 Date: Fri, 1 Apr 2016 13:04:44 +0200 [thread overview] Message-ID: <1459508695-14915-1-git-send-email-mhocko@kernel.org> (raw) Hi, the following patchset implements a killable variant of write lock for rw_semaphore. My usecase is to turn as many mmap_sem write users to use a killable variant which will be helpful for the oom_reaper merged in 4.6-rc1 (aac453635549 ("mm, oom: introduce oom reaper")) to asynchronously tear down the oom victim address space which requires mmap_sem for read. This will reduce a likelihood of OOM livelocks caused by oom victim being stuck on a lock or other resource which prevents it to reach its exit path and release the memory. I haven't implemented the killable variant of the read lock because I do not have any usecase for this API. The previous version of this series was posted [1] and the only change since than was the rebase on top of 4.5 (with a clean merge to 4.6-rc1) and Patch3 was updated to only check for fatal signals when the caller would block - aka trylock will get the lock even when signals are pending to be in sync with mutex implementation as per Peter Zijlstra. The patchset is organized as follows. - Patch 1 is a trivial cleanup - Patch 2, I belive, shouldn't introduce any functional changes as per Documentation/memory-barriers.txt. - Patch 3 is the preparatory work and necessary infrastructure for down_write_killable. It implements generic __down_write_killable and prepares the write lock slow path to bail out earlier when told so - Patch 4-1 are implementing arch specific __down_write_killable. One patch per architecture. - finally patch 11 implements down_write_killable and ties everything together. I am not really an expert on lockdep so I hope I got it right. Follow up patches to change mmap_sem write users to killable form is not part of the series because that will be routed via mmotm tree later on. I have tested on x86 with OOM situations with high mmap_sem contention (basically many parallel page faults racing with many parallel mmap/munmap tight loops) so the waiters for the write locks are routinely interrupted by SIGKILL. Thanks! Shortlog says: Michal Hocko (11): locking, rwsem: get rid of __down_write_nested locking, rwsem: drop explicit memory barriers locking, rwsem: introduce basis for down_write_killable alpha, rwsem: provide __down_write_killable ia64, rwsem: provide __down_write_killable s390, rwsem: provide __down_write_killable sh, rwsem: provide __down_write_killable sparc, rwsem: provide __down_write_killable xtensa, rwsem: provide __down_write_killable x86, rwsem: provide __down_write_killable locking, rwsem: provide down_write_killable And diffstat: arch/alpha/include/asm/rwsem.h | 18 ++++++++++++++++-- arch/ia64/include/asm/rwsem.h | 22 ++++++++++++++++++--- arch/s390/include/asm/rwsem.h | 18 ++++++++++++++---- arch/sh/include/asm/rwsem.h | 32 +++++++++++++++---------------- arch/sparc/include/asm/rwsem.h | 14 +++++++++++--- arch/x86/include/asm/rwsem.h | 42 +++++++++++++++++++++++++---------------- arch/x86/lib/rwsem.S | 8 ++++++++ arch/xtensa/include/asm/rwsem.h | 27 ++++++++++++++------------ include/asm-generic/rwsem.h | 13 ++++++++++--- include/linux/lockdep.h | 15 +++++++++++++++ include/linux/rwsem-spinlock.h | 2 +- include/linux/rwsem.h | 3 +++ kernel/locking/rwsem-spinlock.c | 19 ++++++++++++++++--- kernel/locking/rwsem-xadd.c | 31 ++++++++++++++++++++++++------ kernel/locking/rwsem.c | 19 +++++++++++++++++++ 15 files changed, 213 insertions(+), 70 deletions(-) --- [1] http://lkml.kernel.org/r/1456750705-7141-1-git-send-email-mhocko@kernel.org
next prev parent reply other threads:[~2016-04-01 11:04 UTC|newest] Thread overview: 226+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-02-29 12:58 [PATCH 0/11] introduce down_write_killable for rw_semaphore Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 01/11] locking, rwsem: get rid of __down_write_nested Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 02/11] locking, rwsem: drop explicit memory barriers Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 03/11] locking, rwsem: introduce basis for down_write_killable Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-03-30 13:25 ` Peter Zijlstra 2016-03-30 13:25 ` Peter Zijlstra 2016-03-31 8:33 ` Michal Hocko 2016-03-31 8:33 ` Michal Hocko 2016-03-31 8:44 ` Peter Zijlstra 2016-03-31 8:44 ` Peter Zijlstra 2016-03-31 8:55 ` [PATCH] " Michal Hocko 2016-03-31 8:55 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 04/11] alpha, rwsem: provide __down_write_killable Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 05/11] ia64, " Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 06/11] s390, " Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 07/11] sh, " Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 08/11] sparc, " Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 09/11] xtensa, " Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 10/11] x86, " Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-02-29 12:58 ` [PATCH 11/11] locking, rwsem: provide down_write_killable Michal Hocko 2016-02-29 12:58 ` Michal Hocko 2016-03-30 13:32 ` [PATCH 0/11] introduce down_write_killable for rw_semaphore Peter Zijlstra 2016-03-30 13:32 ` Peter Zijlstra 2016-03-31 8:59 ` Michal Hocko 2016-03-31 8:59 ` Michal Hocko 2016-03-31 9:20 ` Ingo Molnar 2016-03-31 9:20 ` Ingo Molnar 2016-03-31 10:58 ` Michal Hocko 2016-03-31 10:58 ` Michal Hocko 2016-03-31 17:03 ` Andrew Morton 2016-03-31 17:03 ` Andrew Morton 2016-04-01 6:33 ` Ingo Molnar 2016-04-01 6:33 ` Ingo Molnar 2016-04-01 9:21 ` Michal Hocko 2016-04-01 9:21 ` Michal Hocko 2016-04-01 9:50 ` Ingo Molnar 2016-04-01 9:50 ` Ingo Molnar 2016-04-01 10:52 ` Michal Hocko 2016-04-01 10:52 ` Michal Hocko 2016-04-01 7:26 ` Michal Hocko 2016-04-01 7:26 ` Michal Hocko 2016-04-01 9:11 ` Andrew Morton 2016-04-01 9:11 ` Andrew Morton 2016-04-01 11:04 ` Michal Hocko [this message] 2016-04-01 11:04 ` [PATCH 0/11] introduce down_write_killable for rw_semaphore v2 Michal Hocko 2016-04-01 11:04 ` [PATCH 01/11] locking, rwsem: get rid of __down_write_nested Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-02 0:28 ` Davidlohr Bueso 2016-04-02 0:28 ` Davidlohr Bueso 2016-04-01 11:04 ` [PATCH 02/11] locking, rwsem: drop explicit memory barriers Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-02 1:17 ` Davidlohr Bueso 2016-04-02 1:17 ` Davidlohr Bueso 2016-04-04 9:03 ` Michal Hocko 2016-04-04 9:03 ` Michal Hocko 2016-04-04 9:06 ` [PATCH 1/2] xtensa, rwsem: drop superfluous arch specific implementation Michal Hocko 2016-04-04 9:06 ` Michal Hocko 2016-04-04 9:06 ` [PATCH 2/2] sh, " Michal Hocko 2016-04-04 9:06 ` Michal Hocko 2016-04-06 9:26 ` Peter Zijlstra 2016-04-06 9:26 ` Peter Zijlstra 2016-04-06 9:50 ` Geert Uytterhoeven 2016-04-06 9:50 ` Geert Uytterhoeven 2016-04-06 10:27 ` Peter Zijlstra 2016-04-06 10:27 ` Peter Zijlstra 2016-04-04 10:23 ` [PATCH 1/2] xtensa, " Max Filippov 2016-04-04 10:23 ` Max Filippov 2016-04-06 9:06 ` [PATCH] sparc, " Michal Hocko 2016-04-06 9:06 ` Michal Hocko 2016-04-06 9:06 ` Michal Hocko 2016-04-06 9:06 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 03/11] locking, rwsem: introduce basis for down_write_killable Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-02 4:41 ` Davidlohr Bueso 2016-04-02 4:41 ` Davidlohr Bueso 2016-04-04 9:17 ` Michal Hocko 2016-04-04 9:17 ` Michal Hocko 2016-04-04 9:21 ` Peter Zijlstra 2016-04-04 9:21 ` Peter Zijlstra 2016-04-07 6:58 ` Davidlohr Bueso 2016-04-07 6:58 ` Davidlohr Bueso 2016-04-07 7:38 ` Michal Hocko 2016-04-07 7:38 ` Michal Hocko 2016-05-10 10:43 ` Tetsuo Handa 2016-05-10 11:53 ` Michal Hocko 2016-05-10 12:38 ` Peter Zijlstra 2016-05-10 13:57 ` Tetsuo Handa 2016-05-11 7:23 ` Michal Hocko 2016-05-11 8:28 ` Michal Hocko 2016-05-11 8:44 ` Peter Zijlstra 2016-05-11 9:04 ` Michal Hocko 2016-05-11 9:17 ` Peter Zijlstra 2016-05-11 9:31 ` Michal Hocko 2016-05-11 9:41 ` Peter Zijlstra 2016-05-11 13:59 ` Michal Hocko 2016-05-11 18:03 ` Michal Hocko 2016-05-12 11:57 ` [PATCH] locking, rwsem: Fix down_write_killable() Peter Zijlstra 2016-05-12 12:15 ` [tip:locking/rwsem] locking/rwsem: " tip-bot for Peter Zijlstra 2016-05-12 16:59 ` [PATCH] locking, rwsem: " Michal Hocko 2016-05-15 20:57 ` [tip:locking/rwsem] locking/rwsem: " tip-bot for Peter Zijlstra 2016-05-12 12:12 ` [PATCH 03/11] locking, rwsem: introduce basis for down_write_killable Peter Zijlstra 2016-05-12 12:19 ` Michal Hocko 2016-05-12 13:58 ` Peter Zijlstra 2016-05-12 19:42 ` Waiman Long 2016-05-11 8:35 ` Peter Zijlstra 2016-05-11 9:02 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 04/11] alpha, rwsem: provide __down_write_killable Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 05/11] ia64, " Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 06/11] s390, " Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 07/11] sh, " Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 08/11] sparc, " Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 09/11] xtensa, " Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-01 11:04 ` [PATCH 10/11] x86, " Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-06 18:31 ` Peter Zijlstra 2016-04-06 18:31 ` Peter Zijlstra 2016-04-01 11:04 ` [PATCH 11/11] locking, rwsem: provide down_write_killable Michal Hocko 2016-04-01 11:04 ` Michal Hocko 2016-04-07 15:12 ` [PATCH 0/11] introduce down_write_killable for rw_semaphore v3 Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-07 15:12 ` [PATCH 01/11] locking, rwsem: get rid of __down_write_nested Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-13 11:32 ` [tip:locking/rwsem] locking/rwsem: Get rid of __down_write_nested() tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 02/11] locking, rwsem: drop explicit memory barriers Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-13 11:32 ` [tip:locking/rwsem] locking/rwsem: Drop " tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 03/11] xtensa, rwsem: drop superfluous arch specific implementation Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-13 11:33 ` [tip:locking/rwsem] locking/rwsem, xtensa: Drop " tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 04/11] sh, rwsem: drop " Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-13 11:33 ` [tip:locking/rwsem] locking/rwsem, sh: Drop " tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 05/11] sparc, rwsem: drop " Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-13 11:33 ` [tip:locking/rwsem] locking/rwsem, sparc: Drop " tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 06/11] locking, rwsem: introduce basis for down_write_killable Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-13 11:34 ` [tip:locking/rwsem] locking/rwsem: Introduce basis for down_write_killable() tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 07/11] alpha, rwsem: provide __down_write_killable Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-22 9:42 ` [tip:locking/rwsem] locking/rwsem, alpha: Provide __down_write_killable() tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 08/11] ia64, rwsem: provide __down_write_killable Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-07 17:28 ` Sergei Shtylyov 2016-04-07 17:28 ` Sergei Shtylyov 2016-04-08 6:22 ` Michal Hocko 2016-04-08 6:22 ` Michal Hocko 2016-04-22 9:43 ` [tip:locking/rwsem] locking/rwsem, ia64: Provide __down_write_killable() tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 09/11] s390, rwsem: provide __down_write_killable Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-22 9:43 ` [tip:locking/rwsem] locking/rwsem, s390: Provide __down_write_killable() tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 10/11] x86, rwsem: provide __down_write_killable Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-13 9:08 ` Ingo Molnar 2016-04-13 9:08 ` Ingo Molnar 2016-04-13 9:16 ` Michal Hocko 2016-04-13 9:16 ` Michal Hocko 2016-04-13 9:19 ` Ingo Molnar 2016-04-13 9:19 ` Ingo Molnar 2016-04-13 10:27 ` Ingo Molnar 2016-04-13 10:27 ` Ingo Molnar 2016-04-13 12:49 ` Michal Hocko 2016-04-13 12:49 ` Michal Hocko 2016-04-13 12:49 ` Michal Hocko 2016-04-13 12:49 ` Michal Hocko 2016-04-17 16:59 ` Michal Hocko 2016-04-17 16:59 ` Michal Hocko 2016-04-17 16:59 ` Michal Hocko 2016-04-20 13:40 ` Peter Zijlstra 2016-04-20 13:40 ` Peter Zijlstra 2016-04-20 13:40 ` Peter Zijlstra 2016-04-20 18:04 ` H. Peter Anvin 2016-04-20 18:04 ` H. Peter Anvin 2016-04-20 20:45 ` Borislav Petkov 2016-04-20 20:45 ` Borislav Petkov 2016-04-20 20:58 ` Michal Hocko 2016-04-20 20:58 ` Michal Hocko 2016-04-20 21:06 ` H. Peter Anvin 2016-04-20 21:06 ` H. Peter Anvin 2016-04-20 21:36 ` Borislav Petkov 2016-04-20 21:36 ` Borislav Petkov 2016-04-20 22:29 ` H. Peter Anvin 2016-04-20 22:29 ` H. Peter Anvin 2016-04-21 11:35 ` Borislav Petkov 2016-04-21 11:35 ` Borislav Petkov 2016-04-21 13:09 ` Michal Hocko 2016-04-21 13:09 ` Michal Hocko 2016-04-21 13:21 ` Borislav Petkov 2016-04-21 13:21 ` Borislav Petkov 2016-04-27 12:02 ` [PATCH] x86/locking/rwsem: Cleanup ____down_write() Borislav Petkov 2016-04-27 12:02 ` Borislav Petkov 2016-04-28 10:27 ` [tip:locking/rwsem] locking/rwsem, x86: Clean up ____down_write() tip-bot for Borislav Petkov 2016-04-22 6:53 ` [PATCH 10/11] x86, rwsem: provide __down_write_killable Ingo Molnar 2016-04-22 6:53 ` Ingo Molnar 2016-04-22 6:53 ` Ingo Molnar 2016-04-13 9:57 ` [PATCH] x86: add frame annotation for call_rwsem_down_write_failed_killable Michal Hocko 2016-04-13 9:57 ` Michal Hocko 2016-04-13 9:57 ` Michal Hocko 2016-04-22 9:44 ` [tip:locking/rwsem] locking/rwsem, x86: Add frame annotation for call_rwsem_down_write_failed_killable() tip-bot for Michal Hocko 2016-04-22 9:43 ` [tip:locking/rwsem] locking/rwsem, x86: Provide __down_write_killable() tip-bot for Michal Hocko 2016-04-07 15:12 ` [PATCH 11/11] locking, rwsem: provide down_write_killable Michal Hocko 2016-04-07 15:12 ` Michal Hocko 2016-04-22 9:44 ` [tip:locking/rwsem] locking/rwsem: Provide down_write_killable() tip-bot for Michal Hocko 2016-04-12 9:37 ` [PATCH 0/11] introduce down_write_killable for rw_semaphore v3 Michal Hocko 2016-04-12 9:37 ` Michal Hocko 2016-04-12 15:40 ` Peter Zijlstra 2016-04-12 15:40 ` Peter Zijlstra 2016-04-12 18:01 ` Michal Hocko 2016-04-12 18:01 ` Michal Hocko
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