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memcg: mm_update_next_owner() should skip kthreads 

"Search through everything else" in mm_update_next_owner() can hit a
kthread which adopted this "mm" via use_mm(), it should not be used as
mm->owner.  Add the PF_KTHREAD check.

While at it, change this code to use for_each_process_thread() instead
of deprecated do_each_thread/while_each_thread.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Peter Chiang <pchiang@nvidia.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 2014-06-04 16:07:52 -07:00 committed by Linus Torvalds
parent f7e2f7e896
commit f87fb599ae
1 changed files with 4 additions and 6 deletions
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10
kernel/exit.c
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@ -395,14 +395,12 @@ retry:
}
/*
* Search through everything else. We should not get
* here often
* Search through everything else, we should not get here often.
*/
do_each_thread(g, c) {
if (c->mm == mm)
for_each_process_thread(g, c) {
if (!(c->flags & PF_KTHREAD) && c->mm == mm)
goto assign_new_owner;
} while_each_thread(g, c);
}
read_unlock(&tasklist_lock);
/*
* We found no owner yet mm_users > 1: this implies that we are