linux-kernel - Re: [mm] [PATCH 3/4] Memory cgroup hierarchical reclaim (v4)

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Message-Id: <20081209125829.556b1e40.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 9 Dec 2008 12:58:29 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Cc:	balbir@...ux.vnet.ibm.com, linux-mm@...ck.org,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [mm] [PATCH 3/4] Memory cgroup hierarchical reclaim (v4)

On Tue, 9 Dec 2008 12:53:41 +0900
Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:

> Not yet.
> 
> Those dead locks cannot be fixed as long as reclaim path tries to hold cgroup_mutex.
> (current mmotm doesn't hold cgroup_mutex on reclaim path if !use_hierarchy and
> I'm testing with !use_hierarchy. It works well basically, but I got another bug
> at rmdir today, and digging it now.)
> 
> The dead lock I've fixed by memcg-avoid-dead-lock-caused-by-race-between-oom-and-cpuset_attach.patch
> is another one(removed cgroup_lock from oom code).
> 
Okay, then removing cgroup_lock from memory-reclaim path is a way to go..

Thank you.

-Kame

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