linux-kernel - Re: cgroup: rmdir() does not complete

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Message-ID: <alpine.LNX.2.01.1009100818480.5721@vega.localdomain>
Date:	Fri, 10 Sep 2010 08:28:00 +0100 (BST)
From:	Mark Hills <mark@...o.org.uk>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: cgroup: rmdir() does not complete

On Fri, 10 Sep 2010, KAMEZAWA Hiroyuki wrote:

> On Fri, 10 Sep 2010 00:04:31 +0100 (BST)
> Mark Hills <mark@...o.org.uk> wrote:
> > The report on the spinning process (23586) is dominated by calls from 
> > mem_cgroup_force_empty.
> > 
> > It seems to show lru_add_drain_all and drain_all_stock_sync are causing 
> > the load (I assume drain_all_stock_sync has been optimised out). But I 
> > don't think this is as important as what causes the spin.
> > 
> 
> I noticed you use FUSE and it seems there is a problem in FUSE v.s. memcg.
> I wrote a patch (onto 2.6.36 but can be applied..)
> 
> Could you try this ? I'm sorry I don't use FUSE system and can't test
> right now.

What makes you conclude that FUSE is in use? I do not think this is the 
case. Or do you mean that it is a problem that the kernel is built with 
FUSE support?

I _can_ test the patch, but I still cannot reliably reproduce the problem 
so it will be hard to conclude whether the patch works or not. Is there a 
way to build a test case for this?

Thanks for your help

-- 
Mark
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