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

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Message-Id: <20080328202144.5c627380.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 28 Mar 2008 20:21:44 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	balbir@...ux.vnet.ibm.com, Paul Menage <menage@...gle.com>,
	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>
Subject: Re: [-mm] Add an owner to the mm_struct (v2)

On Fri, 28 Mar 2008 20:15:28 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> Now,
> - css_get(memcgrp) is called at mm_struct initialization.
> - css_put(memcgrp) is called at mm_struct freeing.
> 
> How about
> - css_get(memcgrp) is called at task_struct initialization.
> - css_put(memcgrp) is called at task_struct freeing.
> 
> Because
> 1. we find mem_cgroup by mm->owner, after this.
> 2. generic group interface have exit() and clone() callback interface.
> 
> mem_cgroup will not be freed until rmdir(), anyway.
> 
Ignore above. As Paul pointed out, reference count from task is not necessary.

Thanks,
-Kame

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