From: Michal Hocko <mhocko@kernel.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
linux-mm@kvack.org, "Alex Deucher" <alexander.deucher@amd.com>,
"Alex Thorlton" <athorlton@sgi.com>,
"Andrea Arcangeli" <aarcange@redhat.com>,
"Andy Lutomirski" <luto@amacapital.net>,
"Benjamin LaHaise" <bcrl@kvack.org>,
"Christian König" <christian.koenig@amd.com>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"David Airlie" <airlied@linux.ie>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"David Rientjes" <rientjes@google.com>,
"H . Peter Anvin" <hpa@zytor.com>,
"Hugh Dickins" <hughd@google.com>,
"Ingo Molnar" <mingo@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Konstantin Khlebnikov" <koct9i@gmail.com>,
linux-arch@vger.kernel.org, "Mel Gorman" <mgorman@suse.de>,
"Oleg Nesterov" <oleg@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Petr Cermak" <petrcermak@chromium.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Michal Hocko" <mhocko@suse.com>
Subject: [PATCH 06/18] mm: make vm_brk killable
Date: Mon, 29 Feb 2016 14:26:45 +0100 [thread overview]
Message-ID: <1456752417-9626-7-git-send-email-mhocko@kernel.org> (raw)
In-Reply-To: <1456752417-9626-1-git-send-email-mhocko@kernel.org>
From: Michal Hocko <mhocko@suse.com>
Now that all the callers handle vm_brk failure we can change it
wait for mmap_sem killable to help oom_reaper to not get blocked
just because vm_brk gets blocked behind mmap_sem readers.
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
include/linux/mm.h | 2 +-
mm/mmap.c | 9 +++------
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4ee6a3561540..dccaea8682f2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2077,7 +2077,7 @@ static inline void mm_populate(unsigned long addr, unsigned long len) {}
#endif
/* These take the mm semaphore themselves */
-extern unsigned long vm_brk(unsigned long, unsigned long);
+extern unsigned long __must_check vm_brk(unsigned long, unsigned long);
extern int vm_munmap(unsigned long, size_t);
extern unsigned long __must_check vm_mmap(struct file *, unsigned long,
unsigned long, unsigned long,
diff --git a/mm/mmap.c b/mm/mmap.c
index 5d33c841e3a2..3f264fb14118 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2718,12 +2718,9 @@ unsigned long vm_brk(unsigned long addr, unsigned long len)
unsigned long ret;
bool populate;
- /*
- * XXX not all users are chcecking the return value, convert
- * to down_write_killable after they are able to cope with
- * error
- */
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+
ret = do_brk(addr, len);
populate = ((mm->def_flags & VM_LOCKED) != 0);
up_write(&mm->mmap_sem);
--
2.7.0
--
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next prev parent reply other threads:[~2016-02-29 13:27 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 13:26 [PATCH 0/18] change mmap_sem taken for write killable Michal Hocko
2016-02-29 13:26 ` [PATCH 01/18] mm: Make mmap_sem for write waits killable for mm syscalls Michal Hocko
2016-02-29 13:44 ` kbuild test robot
2016-02-29 13:44 ` kbuild test robot
2016-03-10 15:47 ` Vlastimil Babka
2016-03-10 15:56 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 02/18] mm: make vm_mmap killable Michal Hocko
2016-03-11 9:59 ` Vlastimil Babka
2016-03-11 12:12 ` Michal Hocko
2016-03-11 12:43 ` Vlastimil Babka
2016-03-11 12:55 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 03/18] mm: make vm_munmap killable Michal Hocko
2016-03-11 10:06 ` Vlastimil Babka
2016-03-11 12:32 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 04/18] mm, aout: handle vm_brk failures Michal Hocko
2016-03-11 10:32 ` Vlastimil Babka
2016-03-11 12:42 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 05/18] mm, elf: handle vm_brk error Michal Hocko
2016-03-11 10:35 ` Vlastimil Babka
2016-02-29 13:26 ` Michal Hocko [this message]
2016-03-11 10:44 ` [PATCH 06/18] mm: make vm_brk killable Vlastimil Babka
2016-02-29 13:26 ` [PATCH 07/18] mm, proc: make clear_refs killable Michal Hocko
2016-02-29 13:47 ` kbuild test robot
2016-02-29 17:38 ` Oleg Nesterov
2016-02-29 17:53 ` Michal Hocko
2016-02-29 17:58 ` Oleg Nesterov
2016-02-29 18:02 ` Michal Hocko
2016-02-29 17:56 ` [PATCH] " Michal Hocko
2016-02-29 18:16 ` Oleg Nesterov
2016-02-29 20:25 ` kbuild test robot
2016-03-11 10:59 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 08/18] mm, fork: make dup_mmap wait for mmap_sem for write killable Michal Hocko
2016-02-29 13:48 ` kbuild test robot
2016-02-29 17:54 ` Oleg Nesterov
2016-02-29 18:07 ` [PATCH] " Michal Hocko
2016-02-29 20:13 ` kbuild test robot
2016-03-11 11:12 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 09/18] ipc, shm: make shmem attach/detach wait for mmap_sem killable Michal Hocko
2016-03-08 19:15 ` Davidlohr Bueso
2016-03-09 10:16 ` Michal Hocko
2016-03-09 10:19 ` [PATCH] " Michal Hocko
2016-03-09 10:46 ` kbuild test robot
2016-03-11 11:18 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 10/18] vdso: make arch_setup_additional_pages wait for mmap_sem for write killable Michal Hocko
2016-02-29 13:45 ` kbuild test robot
2016-02-29 13:50 ` kbuild test robot
2016-02-29 13:53 ` kbuild test robot
2016-02-29 15:41 ` Andy Lutomirski
2016-03-11 11:28 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 11/18] coredump: make coredump_wait wait for mma_sem " Michal Hocko
2016-02-29 15:57 ` Oleg Nesterov
2016-03-11 11:32 ` Vlastimil Babka
2016-03-11 11:54 ` Vlastimil Babka
2016-03-11 12:46 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 12/18] aio: make aio_setup_ring killable Michal Hocko
2016-02-29 16:17 ` Jeff Moyer
2016-03-11 11:57 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 13/18] exec: make exec path waiting for mmap_sem killable Michal Hocko
2016-02-29 17:23 ` Oleg Nesterov
2016-02-29 17:47 ` Michal Hocko
2016-02-29 18:10 ` Oleg Nesterov
2016-03-11 12:51 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 14/18] prctl: make PR_SET_THP_DISABLE wait " Michal Hocko
2016-03-11 12:54 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 15/18] uprobes: wait for mmap_sem for write killable Michal Hocko
2016-02-29 15:57 ` Oleg Nesterov
2016-02-29 16:28 ` Michal Hocko
2016-02-29 17:12 ` Oleg Nesterov
2016-02-29 17:42 ` [PATCH] " Michal Hocko
2016-02-29 17:52 ` kbuild test robot
2016-02-29 17:53 ` kbuild test robot
2016-02-29 18:11 ` Oleg Nesterov
2016-02-29 18:22 ` Michal Hocko
2016-02-29 18:38 ` Oleg Nesterov
2016-03-11 14:58 ` Vlastimil Babka
2016-03-11 15:32 ` Michal Hocko
2016-02-29 13:26 ` [PATCH 16/18] drm/i915: make i915_gem_mmap_ioctl wait for mmap_sem killable Michal Hocko
2016-03-11 15:23 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 17/18] drm/radeon: make radeon_mn_get " Michal Hocko
2016-02-29 13:35 ` Christian König
2016-03-11 15:27 ` Vlastimil Babka
2016-02-29 13:26 ` [PATCH 18/18] drm/amdgpu: make amdgpu_mn_get " Michal Hocko
2016-03-11 15:29 ` Vlastimil Babka
2016-02-29 13:31 ` [PATCH 0/18] change mmap_sem taken for write killable Michal Hocko
2016-02-29 14:04 ` Kirill A. Shutemov
2016-02-29 14:16 ` Michal Hocko
2016-02-29 15:03 ` Kirill A. Shutemov
2016-04-26 12:56 [PATCH 0/18] change mmap_sem taken for write killable v2 Michal Hocko
2016-04-26 12:56 ` [PATCH 06/18] mm: make vm_brk killable Michal Hocko
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