linux-kernel - Re: [RFC][-mm] Add an owner to the mm

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Message-ID: <6599ad830804022110h2090f3efg7c6173df8185679e@mail.gmail.com>
Date:	Wed, 2 Apr 2008 21:10:36 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"Pavel Emelianov" <xemul@...nvz.org>,
	"Hugh Dickins" <hugh@...itas.com>,
	"Sudhir Kumar" <skumar@...ux.vnet.ibm.com>,
	"YAMAMOTO Takashi" <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org, "David Rientjes" <rientjes@...gle.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][-mm] Add an owner to the mm_struct (v4)

On Wed, Apr 2, 2008 at 9:05 PM, Balbir Singh <balbir@...ux.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
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