From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Paul Menage" <menage@google.com>
Subject: Re: [RFC][-mm] Add an owner to the mm_struct (v4)
Date: Wed, 2 Apr 2008 21:10:36 -0700
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Cc: Pavel Emelianov <xemul@openvz.org>, Hugh Dickins <hugh@veritas.com>, Sudhir Kumar <skumar@linux.vnet.ibm.com>, YAMAMOTO Takashi <yamamoto@valinux.co.jp>, lizf@cn.fujitsu.com, linux-kernel@vger.kernel.org, taka@valinux.co.jp, linux-mm@kvack.org, David Rientjes <rientjes@google.com>, Andrew Morton <akpm@linux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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On Wed, Apr 2, 2008 at 9:05 PM, Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
>
>  I checked to see that cgroup_exit is called after mm_update_new_owner(). We call
>  mm_update_new_owner() from exit_mm(). I did not check for current->cgroups !=
>  new_owner->cgroups, since I did not want to limit the callbacks.

No cgroup subsystem should be concerned about mm ownership changes
between tasks in the same cgroup. So I think that's a valid and useful
optimization.

Paul