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

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Message-Id: <20080402135357.04c3e79f.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 2 Apr 2008 13:53:57 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	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: [RFC][-mm] Add an owner to the mm_struct (v4)

On Wed, 02 Apr 2008 08:55:34 +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);
> > 
> > Doing above in synchronized manner seems too heavy.
> > When this happen ? or Can this be done in lazy "on-demand" manner ?
> > 
> 
> Do you mean under task_lock()?
> 
No, scanning itself. 
How rarely this scan happens under a server which has 10000- threads ?

Thanks,
-Kame

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