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mm: oom_kill: don't ignore oom score on exiting tasks

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When the OOM killer scans tasks and encounters a PF_EXITING one, it
force-selects that task regardless of the score.  The problem is that if
that task got stuck waiting for some state the allocation site is
holding, the OOM reaper can not move on to the next best victim.

Frankly, I don't even know why we check for exiting tasks in the OOM
killer.  We've tried direct reclaim at least 15 times by the time we
decide the system is OOM, there was plenty of time to exit and free
memory; and a task might exit voluntarily right after we issue a kill.
This is testing pure noise.  Remove it.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrea Argangeli <andrea@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2016-03-17 14:17:26 -07:00 committed by Linus Torvalds
parent a1ee1932aa
commit 6a618957ad
1 changed files with 0 additions and 3 deletions
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3
mm/oom_kill.c
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@ -287,9 +287,6 @@ enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
if (oom_task_origin(task)) if (oom_task_origin(task))
return OOM_SCAN_SELECT; return OOM_SCAN_SELECT;
if (task_will_free_mem(task) && !is_sysrq_oom(oc))
return OOM_SCAN_ABORT;
return OOM_SCAN_OK; return OOM_SCAN_OK;
} }