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

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Message-ID: <508E8910.40203@parallels.com>
Date:	Mon, 29 Oct 2012 17:48:00 +0400
From:	Glauber Costa <glommer@...allels.com>
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>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>
Subject: Re: [PATCH v3 2/6] memcg: root_cgroup cannot reach mem_cgroup_move_parent

On 10/26/2012 03:37 PM, 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>

I think it would be safer to have this folded in the last patch, to
avoid a weird intermediate state (specially for force_empty). Being a
single statement, it doesn't confuse review so much.

However, this is also pretty much just a nitpick, do as you prefer.

Reviewed-by: Glauber Costa <glommer@...allels.com>

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