linux-kernel - Re: [PATCH v4 2/6] memcg: rework mem_cgroup

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Date:	Fri, 15 Feb 2013 17:13:21 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Johannes Weiner <hannes@...xchg.org>,
	Ying Han <yinghan@...gle.com>, Tejun Heo <htejun@...il.com>,
	Glauber Costa <glommer@...allels.com>,
	Li Zefan <lizefan@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4 2/6] memcg: rework mem_cgroup_iter to use cgroup iterators

(2013/02/15 17:11), Michal Hocko wrote:
> On Fri 15-02-13 17:03:09, KAMEZAWA Hiroyuki wrote:
				css_get(&curr->css);
>> I'm sorry if I miss something...
>>
>> This curr is  curr == memcg = mem_cgroup_from_css(css) <= already try_get() done.
>> double refcounted ?
>
> Yes we get 2 references here. One for the returned memcg - which will be
> released either by mem_cgroup_iter_break or a next iteration round
> (where it would be prev) and the other is for last_visited which is
> released when a new memcg is cached.
>
Sure.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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