linux-kernel - Re: [RFC][PATCH 0/4] memcg: add support for hwpoison testing

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Message-ID: <20090901163152.GC5022@balbir.in.ibm.com>
Date:	Tue, 1 Sep 2009 22:01:52 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"menage@...gle.com" <menage@...gle.com>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH 0/4] memcg: add support for hwpoison testing

* Wu Fengguang <fengguang.wu@...el.com> [2009-09-01 16:55:49]:

> > My point is that memcg can show 'owner' of pages but the page may
> > be shared with something important task _and_ if a task is migrated,
> > its pages' memcg information is not updated now. Then, you can kill
> > a task which is not in memcg.
> 
> Ah thanks! I'm not aware of that tricky fact, and it does make a
> very good reason not to use memcg, although I guess locked page won't
> be migrated.
>

I think what Kamezawa-San is pointing to is that the task can migrate,
leaving behind the page in the memcg and poisioning those pages can
kill a task outside the memcg. 

-- 
	Balbir
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