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| author | David Rientjes <rientjes@google.com> | 2012-07-31 16:42:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 18:42:42 -0700 |
| commit | 121d1ba0a019e1465a53533aea133b1b0f6b442d (patch) | |
| tree | ced96bee65407895048a50ba4cbf50a4fc0f12d2 | |
| parent | 2a13515c398bbe471bf64519ada87fd708152ced (diff) | |
| download | blackbird-op-linux-121d1ba0a019e1465a53533aea133b1b0f6b442d.tar.gz blackbird-op-linux-121d1ba0a019e1465a53533aea133b1b0f6b442d.zip | |
mm, oom: fix potential killing of thread that is disabled from oom killing
/proc/sys/vm/oom_kill_allocating_task will immediately kill current when
the oom killer is called to avoid a potentially expensive tasklist scan
for large systems.
Currently, however, it is not checking current's oom_score_adj value which
may be OOM_SCORE_ADJ_MIN, meaning that it has been disabled from oom
killing.
This patch avoids killing current in such a condition and simply falls
back to the tasklist scan since memory still needs to be freed.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/oom_kill.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index e8ab3dfbc74b..50e74373e855 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -719,9 +719,9 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, check_panic_on_oom(constraint, gfp_mask, order, mpol_mask); read_lock(&tasklist_lock); - if (sysctl_oom_kill_allocating_task && + if (sysctl_oom_kill_allocating_task && current->mm && !oom_unkillable_task(current, NULL, nodemask) && - current->mm) { + current->signal->oom_score_adj != OOM_SCORE_ADJ_MIN) { oom_kill_process(current, gfp_mask, order, 0, totalpages, NULL, nodemask, "Out of memory (oom_kill_allocating_task)"); |
