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

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Message-Id: <20080409094246.f9a2a901.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 9 Apr 2008 09:42:46 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	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 (v8)

On Fri, 04 Apr 2008 13:35:44 +0530
Balbir Singh <balbir@...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);
> +
I'm sorry for my laziness.

Why do_each_thread() ? for_each_process() is not enough ?
(because of delay_group_leader().)

And what we have to test for the worst case is following, right ?
==
 1. create a tons of threads.
 2. create a process which calls vfork().
 3. keep child alive and vfork() caller exits
==

Thanks,
-Kame

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