From: David Rientjes <rientjes@google.com>
Date: Wed, 3 Jul 2013 22:01:23 +0000 (-0700)
Subject: mm, memcg: don't take task_lock in task_in_mem_cgroup
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~17^2~409
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ffbdccf5e1facd18b54429a749667fb185c10f20;p=pandora-kernel.git

mm, memcg: don't take task_lock in task_in_mem_cgroup

For processes that have detached their mm's, task_in_mem_cgroup()
unnecessarily takes task_lock() when rcu_read_lock() is all that is
necessary to call mem_cgroup_from_task().

While we're here, switch task_in_mem_cgroup() to return bool.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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