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

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Message-ID: <20130421014241.GC19097@mtj.dyndns.org>
Date:	Sat, 20 Apr 2013 18:42:41 -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,

On Sat, Apr 20, 2013 at 09:06:44AM +0800, Li Zefan wrote:
> I was trying to fix a bug: before moving tasks out of empty cpusets,
> update_tasks_nodemask() is called, which calls do_migrate_pages(xx, from, to)
> finally, from == node_to_be_offlined, to == empty_nodeamsk, so I guess
> no pages will be migrated.
> 
> Then when those tasks are moving to an ancestor, do_migrate_pages(xx, from, to)
> is called again, from == empty_nodemask, to == ancestor's nodemask,
> so I guess again no pages will be migrated.

Oh, I see.  I was a bit confused by the description.  Maybe include
the above?

Thanks.

-- 
tejun
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