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authorJohannes Weiner <hannes@cmpxchg.org>2013-12-12 17:12:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-12 18:19:26 -0800
commita0d8b00a3381f9d75764b3377590451cb0b4fe41 (patch)
tree8e50e004aa354150558a637ff7a9d5d8ddab9b13
parentf40386a4e976acb2bd3e0f9ead11e8e769acbe98 (diff)
downloadlinux-a0d8b00a3381f9d75764b3377590451cb0b4fe41.tar.bz2
mm: memcg: do not declare OOM from __GFP_NOFAIL allocations
Commit 84235de394d9 ("fs: buffer: move allocation failure loop into the allocator") started recognizing __GFP_NOFAIL in memory cgroups but forgot to disable the OOM killer. Any task that does not fail allocation will also not enter the OOM completion path. So don't declare an OOM state in this case or it'll be leaked and the task be able to bypass the limit until the next userspace-triggered page fault cleans up the OOM state. Reported-by: William Dauchy <wdauchy@gmail.com> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: <stable@vger.kernel.org> [3.12.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memcontrol.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f1a0ae6e11b8..e3aff0175d4c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2696,6 +2696,9 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
if (unlikely(task_in_memcg_oom(current)))
goto bypass;
+ if (gfp_mask & __GFP_NOFAIL)
+ oom = false;
+
/*
* We always charge the cgroup the mm_struct belongs to.
* The mm_struct's mem_cgroup changes on task migration if the