linux-kernel - Re: [-mm PATCH 5/10] Memory controller task migration (v7)

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Message-Id: <20070828083252.C7D5C1BFA2F@siro.lan>
Date:	Tue, 28 Aug 2007 17:32:52 +0900 (JST)
From:	yamamoto@...inux.co.jp (YAMAMOTO Takashi)
To:	balbir@...ux.vnet.ibm.com
Cc:	akpm@...ux-foundation.org, npiggin@...e.de, a.p.zijlstra@...llo.nl,
	dhaval@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, ebiederm@...ssion.com,
	containers@...ts.osdl.org, menage@...gle.com, xemul@...nvz.org
Subject: Re: [-mm PATCH 5/10] Memory controller task migration (v7)

> YAMAMOTO Takashi wrote:
> >> Allow tasks to migrate from one container to the other. We migrate
> >> mm_struct's mem_container only when the thread group id migrates.
> > 
> >> +	/*
> >> +	 * Only thread group leaders are allowed to migrate, the mm_struct is
> >> +	 * in effect owned by the leader
> >> +	 */
> >> +	if (p->tgid != p->pid)
> >> +		goto out;
> > 
> > does it mean that you can't move a process between containers
> > once its thread group leader exited?
> > 
> > YAMAMOTO Takashi
> 
> 
> Hi,
> 
> Good catch! Currently, we treat the mm as owned by the thread group leader.
> But this policy can be easily adapted to any other desired policy.
> Would you like to see it change to something else?
> 
> -- 
> 	Warm Regards,
> 	Balbir Singh
> 	Linux Technology Center
> 	IBM, ISTL

although i have no good idea right now, something which allows
to move a process with its thread group leader dead would be better.

YAMAMOTO Takashi
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