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mm,oom_reaper: don't call mmput_async() without atomic_inc_not_zero()

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Commit e2fe14564d ("oom_reaper: close race with exiting task") reduced
frequency of needlessly selecting next OOM victim, but was calling
mmput_async() when atomic_inc_not_zero() failed.

Link: http://lkml.kernel.org/r/1464423365-5555-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tetsuo Handa 2016-06-24 14:48:35 -07:00 committed by Linus Torvalds
parent 63c04ee7d3
commit 491a1c65ae
1 changed files with 1 additions and 0 deletions
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mm/oom_kill.c
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@ -478,6 +478,7 @@ static bool __oom_reap_task(struct task_struct *tsk)
mm = p->mm;
if (!atomic_inc_not_zero(&mm->mm_users)) {
task_unlock(p);
mm = NULL;
goto unlock_oom;
}