linux-kernel - Re: [PATCH v3 2/6] memcg: root_cgroup cannot reach mem_cgroup_move

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Message-ID: <20121031163141.GC2305@cmpxchg.org>
Date:	Wed, 31 Oct 2012 12:31:41 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>,
	Glauber Costa <glommer@...allels.com>
Subject: Re: [PATCH v3 2/6] memcg: root_cgroup cannot reach
 mem_cgroup_move_parent

On Fri, Oct 26, 2012 at 01:37:29PM +0200, Michal Hocko wrote:
> The root cgroup cannot be destroyed so we never hit it down the
> mem_cgroup_pre_destroy path and mem_cgroup_force_empty_write shouldn't
> even try to do anything if called for the root.
> 
> This means that mem_cgroup_move_parent doesn't have to bother with the
> root cgroup and it can assume it can always move charges upwards.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>
> Reviewed-by: Tejun Heo <tj@...nel.org>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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