linux-kernel - Re: [regression] cpuset,mm: update tasks' mems

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Message-ID: <alpine.DEB.2.00.1002241307040.30870@chino.kir.corp.google.com>
Date:	Wed, 24 Feb 2010 13:08:12 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Miao Xie <miaox@...fujitsu.com>
cc:	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [regression] cpuset,mm: update tasks' mems_allowed in time
 (58568d2)

On Wed, 24 Feb 2010, Miao Xie wrote:

> I think it is not a big deal because it is safe and doesn't cause any problem.
> Beside that, task->cpus_allowed is initialized to cpu_possible_mask on the no-cpuset
> kernel, so using cpu_possible_mask to initialize task->cpus_allowed is reasonable.
> (top cpuset is a special cpuset, isn't it?)
>  

I'm suprised that I can create a descendant cpuset of top_cpuset that 
cannot include all of its parents' cpus and that the root cpuset's cpus 
mask doesn't change when cpus are onlined/offlined.
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