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>
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 709aedf..7c0dc41 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -256,14 +256,11 @@
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;