From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx193.postini.com [74.125.245.193]) by kanga.kvack.org (Postfix) with SMTP id D1FAA6B0062 for ; Wed, 31 Oct 2012 12:31:46 -0400 (EDT) Date: Wed, 31 Oct 2012 12:31:41 -0400 From: Johannes Weiner Subject: Re: [PATCH v3 2/6] memcg: root_cgroup cannot reach mem_cgroup_move_parent Message-ID: <20121031163141.GC2305@cmpxchg.org> References: <1351251453-6140-1-git-send-email-mhocko@suse.cz> <1351251453-6140-3-git-send-email-mhocko@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1351251453-6140-3-git-send-email-mhocko@suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , Tejun Heo , Li Zefan , KAMEZAWA Hiroyuki , Balbir Singh , Glauber Costa 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 > Reviewed-by: Tejun Heo Acked-by: Johannes Weiner -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org