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authorMichal Hocko <mhocko@suse.cz>2011-11-15 14:36:07 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-15 22:41:51 -0200
commit5aecc85abdb9ac2b0e6548d13652a34142e7ae89 (patch)
tree8939325e1ab98bce8caf16d9bdd3e57cd73af846 /mm/oom_kill.c
parent001ef5e4554b851cf50fe03bc4c266c28ed8e62d (diff)
downloadlinux-5aecc85abdb9ac2b0e6548d13652a34142e7ae89.tar.gz
oom: do not kill tasks with oom_score_adj OOM_SCORE_ADJ_MIN
Commit c9f01245 ("oom: remove oom_disable_count") has removed the oom_disable_count counter which has been used for early break out from oom_badness so we could never select a task with oom_score_adj set to OOM_SCORE_ADJ_MIN (oom disabled). Now that the counter is gone we are always going through heuristics calculation and we always return a non zero positive value. This means that we can end up killing a task with OOM disabled because it is indistinguishable from regular tasks with 1% resp. CAP_SYS_ADMIN tasks with 3% usage of memory or tasks with oom_score_adj set but OOM enabled. Let's break out early if the task should have OOM disabled. Signed-off-by: Michal Hocko <mhocko@suse.cz> Acked-by: David Rientjes <rientjes@google.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Ying Han <yinghan@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 471dedb463a..76f2c5ae908 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -185,6 +185,11 @@ unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
if (!p)
return 0;
+ if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) {
+ task_unlock(p);
+ return 0;
+ }
+
/*
* The memory controller may have a limit of 0 bytes, so avoid a divide
* by zero, if necessary.