linux-kernel - Re: [PATCH 10/43] stop_machine: reimplement without using workqueue

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Message-ID: <4B8C014F.4040300@kernel.org>
Date:	Tue, 02 Mar 2010 03:02:55 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	torvalds@...ux-foundation.org, mingo@...e.hu, peterz@...radead.org,
	awalls@...ix.net, linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	rusty@...tcorp.com.au, cl@...ux-foundation.org,
	dhowells@...hat.com, arjan@...ux.intel.com, avi@...hat.com,
	johannes@...solutions.net, andi@...stfloor.org
Subject: Re: [PATCH 10/43] stop_machine: reimplement without using workqueue

Hello,

On 03/02/2010 01:50 AM, Oleg Nesterov wrote:
>> Oh, I see.  I was thinking get/put_online_cpus() block is exclusive
>> against cpu_maps_update_begin/done() instead of
>> cpu_hotplug_begin/done().  Will update and add comments.
> 
> Agreed, a little comment can help.
> 
> But, just in case, I forgot to repeat this case is not possible anyway.
> _cpu_down() ensures idle_cpu(cpu) == T after __stop_machine(), this means
> that this SCHED_FIFO thread we are going to kthread_stop() later can't
> be active.

Yeah, sure, that was what I was gonna write as comment.  :-)

Thanks for reviewing and see you tomorrow.  It's getting pretty late
(or early) here.  Bye.

-- 
tejun
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