linux-kernel - Re: [PATCH 05/10] cpuset: don't update tasks' cpumask and nodemask in an empty cpuset

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Message-ID: <20130419183618.GC13811@mtj.dyndns.org>
Date:	Fri, 19 Apr 2013 11:36:18 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>,
	Glauber Costa <glommer@...allels.com>
Subject: Re: [PATCH 05/10] cpuset: don't update tasks' cpumask and nodemask
 in an empty cpuset

Hello, Li.

On Fri, Apr 19, 2013 at 08:27:05PM +0800, Li Zefan wrote:
> I think this was introduced unintentionally when cpuset hotplug was
> made asynchronous. Fortunately it does no harm, as updating tasks'
> cpumask will just return failure and there's a guarantee_online_mems()
> when updating nodemask, and then the tasks will be moved to an ancestor
> cpuset.

Yeah, which will update the masks to the proper values anyway, so it
was intentionally written that way as it didn't really matter either
way.  I suppose this helps future changes?  Maybe update the
description a bit?

Thanks.

-- 
tejun
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