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

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Message-ID: <6599ad830804031130s666368a8v2b31ee6db493b501@mail.gmail.com>
Date:	Thu, 3 Apr 2008 11:30:00 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Dave Hansen" <dave@...ux.vnet.ibm.com>
Cc:	"Balbir Singh" <balbir@...ux.vnet.ibm.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>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [-mm] Add an owner to the mm_struct (v7)

On Thu, Apr 3, 2008 at 11:25 AM, Dave Hansen <dave@...ux.vnet.ibm.com> wrote:
>  > +     /*
>  > +      * Search through everything else. We should not get
>  > +      * here often
>  > +      */
>  > +     do_each_thread(g, c) {
>  > +             if (c->mm == mm)
>  > +                     goto assign_new_owner;
>  > +     } while_each_thread(g, c);
>
>  What is the case in which we get here?  Threading that's two deep where
>  none of the immeidate siblings or children is still alive?

Probably the most likely case of this would be a LinuxThreads process
where the manager thread exits, and then the main thread, while other
threads still exist.

Paul
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