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memcg: bugfix check mem_cgroup_disabled() at split fixup 

mem_cgroup_disabled() should be checked at splitting.  If disabled, no
heavy work is necesary.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
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:
KAMEZAWA Hiroyuki 2011-01-25 15:07:28 -08:00 committed by Linus Torvalds
parent 01c88e2d6b
commit 3d37c4a919
1 changed files with 2 additions and 0 deletions
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2
mm/memcontrol.c
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@ -2145,6 +2145,8 @@ void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail)
struct page_cgroup *tail_pc = lookup_page_cgroup(tail);
unsigned long flags;
if (mem_cgroup_disabled())
return;
/*
* We have no races with charge/uncharge but will have races with
* page state accounting.