linux-kernel - Re: [PATCH 09/12] cgroup: make sure parent won't be destroyed before its children

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Message-ID: <20130408153635.GB3021@htj.dyndns.org>
Date:	Mon, 8 Apr 2013 08:36:35 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Glauber Costa <glommer@...allels.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 09/12] cgroup: make sure parent won't be destroyed before
 its children

On Mon, Apr 08, 2013 at 02:35:02PM +0800, Li Zefan wrote:
> Suppose we rmdir a cgroup and there're still css refs, this cgroup won't
> be freed. Then we rmdir the parent cgroup, and the parent is freed
> immediately due to css ref draining to 0. Now it would be a disaster if
> the still-alive child cgroup tries to access its parent.
> 
> Make sure this won't happen.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>
> Reviewed-by: Michal Hocko <mhocko@...e.cz>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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