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authorDavid Rientjes <rientjes@google.com>2012-07-31 16:42:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:42 -0700
commit121d1ba0a019e1465a53533aea133b1b0f6b442d (patch)
treeced96bee65407895048a50ba4cbf50a4fc0f12d2 /mm/oom_kill.c
parent2a13515c398bbe471bf64519ada87fd708152ced (diff)
downloadlinux-121d1ba0a019e1465a53533aea133b1b0f6b442d.tar.gz
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>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index e8ab3dfbc74..50e74373e85 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)");