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oom: skip zombies when iterating tasklist

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We shouldn't defer oom killing if a thread has already detached its ->mm
and still has TIF_MEMDIE set.  Memory needs to be freed, so find kill
other threads that pin the same ->mm or find another task to kill.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: <stable@kernel.org>		[2.6.38.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Vagin 2011-03-22 16:30:11 -07:00 committed by Linus Torvalds
parent 3a5dda7a17
commit 30e2b41f20
1 changed files with 3 additions and 1 deletions
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4
mm/oom_kill.c
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@ -299,6 +299,8 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
do_each_thread(g, p) {
unsigned int points;
if (!p->mm)
continue;
if (oom_unkillable_task(p, mem, nodemask))
continue;
@ -324,7 +326,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
* the process of exiting and releasing its resources.
* Otherwise we could get an easy OOM deadlock.
*/
if ((p->flags & PF_EXITING) && p->mm) {
if (p->flags & PF_EXITING) {
if (p != current)
return ERR_PTR(-1UL);