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| author | Michal Hocko <mhocko@suse.cz> | 2011-11-15 14:36:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-15 22:41:51 -0200 |
| commit | 5aecc85abdb9ac2b0e6548d13652a34142e7ae89 (patch) | |
| tree | 8939325e1ab98bce8caf16d9bdd3e57cd73af846 /mm | |
| parent | 001ef5e4554b851cf50fe03bc4c266c28ed8e62d (diff) | |
| download | linux-5aecc85abdb9ac2b0e6548d13652a34142e7ae89.tar.gz linux-5aecc85abdb9ac2b0e6548d13652a34142e7ae89.tar.bz2 linux-5aecc85abdb9ac2b0e6548d13652a34142e7ae89.zip | |
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')
| -rw-r--r-- | mm/oom_kill.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 471dedb463ab..76f2c5ae908e 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. |