linux-kernel - Re: [PATCH v3 5/6] memcg: make mem_cgroup_reparent

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Message-ID: <508E8DA8.70101@parallels.com>
Date:	Mon, 29 Oct 2012 18:07:36 +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 5/6] memcg: make mem_cgroup_reparent_charges non failing

On 10/26/2012 03:37 PM, Michal Hocko wrote:
> Now that pre_destroy callbacks are called from the context where neither
> any task can attach the group nor any children group can be added there
> is no other way to fail from mem_cgroup_pre_destroy.
> mem_cgroup_pre_destroy doesn't have to take a reference to memcg's css
> because all css' are marked dead already.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>

Good change.

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

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