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

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Message-ID: <6599ad830804031058l1e2a7ad9p56cff47dca738d79@mail.gmail.com>
Date:	Thu, 3 Apr 2008 10:58:20 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Balbir Singh" <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: [-mm] Add an owner to the mm_struct (v7)

On Thu, Apr 3, 2008 at 10:44 AM, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>  +
>  +       /*
>  +        * If there are other users of the mm and the owner (us) is exiting
>  +        * we need to find a new owner to take on the responsibility.
>  +        * When we use thread groups (CLONE_THREAD), the thread group
>  +        * leader is kept around in zombie state, even after it exits.
>  +        * delay_group_leader() ensures that if the group leader is around
>  +        * we need not select a new owner.
>  +        */

Hmm, is this new check for delay_group_leader() safe? Won't we have
called exit_cgroup() by this point, and hence be reassigned to the
root cgroup? And so mm->owner->cgroups won't point to the right place?

Paul
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