linux-kernel - Re: [RFC][PATCH 1/6] memcg: fix pre

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Date:	Wed, 10 Dec 2008 22:47:58 +0900
From:	Daisuke Nishimura <d-nishimura@....biglobe.ne.jp>
To:	balbir@...ux.vnet.ibm.com
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	d-nishimura@....biglobe.ne.jp
Subject: Re: [RFC][PATCH 1/6] memcg: fix pre_destory handler

On Wed, 10 Dec 2008 18:55:59 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2008-12-10 20:29:41]:
> 
> > Paul Menage said:
> > > The reason for needing this patch is because of the non-atomic locking
> > > in cgroup_rmdir() that was introduced due to the circular locking
> > > dependency between the hotplug lock and the cgroup_mutex.
> > >
> > > But rather than adding a whole bunch more complexity, this looks like
> > > another case that could be solved by the hierarchy_mutex patches that
> > > I posted a while ago.
> > >
> 
> Paul, I can't find those patches in -mm. I will try and dig them out
> from my mbox. I agree, we need a hierarchy_mutex, cgroup_mutex is
> becoming the next BKL.
> 
Hmm.. but doesn't per-hierarchy-mutex solve the problem if memory and cpuset
mounted on the same hierarchy ?


Thanks,
Daisuke Nishimura.
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