linux-kernel - Re: [PATCH 1/2] cpuset: fix cpuset_cpus_allowed_fallback() don't update tsk->rt.nr_cpus

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Message-ID: <BANLkTi=GYr6XWyt50YaJ=WrDMFZ3aGAQkg@mail.gmail.com>
Date:	Thu, 19 May 2011 16:54:40 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Li Zefan <lizf@...fujitsu.com>,
	Miao Xie <miaox@...fujitsu.com>
Subject: Re: [PATCH 1/2] cpuset: fix cpuset_cpus_allowed_fallback() don't
 update tsk->rt.nr_cpus_allowed

On Thu, May 19, 2011 at 4:45 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Mon, 2011-05-16 at 21:37 +0800, Yong Zhang wrote:
>>
>> But I'm afraid this patch still doesn't help.
>> If I understand your patch correctly, you just put the wake up to CPU_STARTING,
>> but it's still before CPU_ONLINE.\
>
> Well, that's the whole point really, CPU_ONLINE is terribly late. But
> did you perhaps mean to say its before we mark the cpu online?

I always try to express myself correctly(poor english :)

Precisely, it's before we mark the cpu active. sched_cpu_active()
is call when CPU_ONLINE.

Thanks,
Yong

>
>> Please check my mail to Paul's in this thread group.
>
> Not sure that made things any clearer.
>



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