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oom: check PF_KTHREAD instead of !mm to skip kthreads 

select_bad_process() thinks a kernel thread can't have ->mm != NULL, this
is not true due to use_mm().

Change the code to check PF_KTHREAD.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2010-08-09 17:18:43 -07:00 committed by Linus Torvalds
parent a9877cc293
commit 455c0e5fb0
1 changed files with 3 additions and 6 deletions
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9
mm/oom_kill.c
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@ -256,14 +256,11 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
for_each_process(p) {
unsigned long points;
/*
* skip kernel threads and tasks which have already released
* their mm.
*/
/* skip tasks that have already released their mm */
if (!p->mm)
continue;
/* skip the init task */
if (is_global_init(p))
/* skip the init task and kthreads */
if (is_global_init(p) || (p->flags & PF_KTHREAD))
continue;
if (mem && !task_in_mem_cgroup(p, mem))
continue;