linux-kernel - Re: [PATCHSET cgroup/for-3.8] cpuset: decouple cpuset locking from cgroup core

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Message-ID: <20130103222039.GD2753@mtj.dyndns.org>
Date:	Thu, 3 Jan 2013 17:20:39 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	paul@...lmenage.org, glommer@...allels.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	peterz@...radead.org, mhocko@...e.cz, bsingharora@...il.com,
	hannes@...xchg.org, kamezawa.hiroyu@...fujitsu.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET cgroup/for-3.8] cpuset: decouple cpuset locking from
 cgroup core

Hey, Li.

On Wed, Dec 26, 2012 at 06:51:02PM +0800, Li Zefan wrote:
> I created a cpuset which has cpuset.cpus=1, and I forked a few cpu-hog tasks
> and moved them to this cpuset, and the final operations was offlining cpu1.
> It stucked.

This was caused by not rebuilding sched domains synchronously from cpu
offline path.  I looks like scheduler got confused and put tasks on
the dead cpu.  Should be okay in the updated patchset.  Can you please
test / review that one?

Thanks.

-- 
tejun
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