linux-kernel - Re: [RFC][PATCH 3/7] memcg: use css_get/put when charging/uncharging kmem

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Date:	Fri, 5 Apr 2013 14:19:40 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Li Zefan <lizefan@...wei.com>
CC:	<linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [RFC][PATCH 3/7] memcg: use css_get/put when charging/uncharging
 kmem

On 04/03/2013 01:12 PM, Li Zefan wrote:
> Use css_get/put instead of mem_cgroup_get/put.
> 
> We can't do a simple replacement, because here mem_cgroup_put()
> is called during mem_cgroup_css_free(), while mem_cgroup_css_free()
> won't be called until css refcnt goes down to 0.
> 
> Instead we increment css refcnt in mem_cgroup_css_offline(), and
> then check if there's still kmem charges. If not, css refcnt will
> be decremented, otherwise the refcnt will be decremented when
> kmem charges goes down to 0.

That is okay, it should work.
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