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memcg: optimize the "Search everything else" loop in mm_update_next_owner()

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for_each_process_thread() is sub-optimal. All threads share the same
->mm, we can swicth to the next process once we found a thread with
->mm != NULL and ->mm != mm.

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 16:07:54 -07:00 committed by Linus Torvalds
parent f87fb599ae
commit 39af1765f1
1 changed files with 9 additions and 3 deletions
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12
kernel/exit.c
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@ -397,9 +397,15 @@ retry:
/*
* Search through everything else, we should not get here often.
*/
for_each_process_thread(g, c) {
if (!(c->flags & PF_KTHREAD) && c->mm == mm)
goto assign_new_owner;
for_each_process(g) {
if (g->flags & PF_KTHREAD)
continue;
for_each_thread(g, c) {
if (c->mm == mm)
goto assign_new_owner;
if (c->mm)
break;
}
}
read_unlock(&tasklist_lock);
/*