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Message-ID: <6599ad830804022110h2090f3efg7c6173df8185679e@mail.gmail.com>
Date: Wed, 2 Apr 2008 21:10:36 -0700
From: "Paul Menage" <menage@google.com>
To: balbir@linux.vnet.ibm.com
Subject: Re: [RFC][-mm] Add an owner to the mm_struct (v4)
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