linux-kernel - Re: [PATCH 06/11] cpuset: apply cs->real_{cpus,mems}

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Message-ID: <20130821140151.GF19286@mtj.dyndns.org>
Date:	Wed, 21 Aug 2013 10:01:51 -0400
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>
Subject: Re: [PATCH 06/11] cpuset: apply cs->real_{cpus,mems}_allowed

On Wed, Aug 21, 2013 at 05:59:56PM +0800, Li Zefan wrote:
> Now we can use cs->real{cpus,mems}_allowed as effective masks. It's
> used whenever:
> 
> - we update tasks' cpus_allowed/mems_allowed,
> - we want to retrieve tasks_cs(tsk)'s cpus_allowed/mems_allowed.
> 
> They actually replace effective_{cpu,node}mask_cpuset().

I think it'd be great if this and the previous patch descriptions
explain that the effective masks equal configured sans the offline
cpus / mems except when the result is empty, in which case it takes on
the nearest ancestor whose intersection isn't empty, and that the
result equals the computed masks from
effective_{cpu,node}mask_cpuset().

Thanks.

-- 
tejun
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