linux-kernel - Re: [RFC][PATCH 0/5] Reduce runqueue lock contention -v2

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Date:	Thu, 16 Dec 2010 20:42:56 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	frank.rowand@...sony.com
Cc:	frank.rowand@...il.com, Chris Mason <chris.mason@...cle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>,
	Oleg Nesterov <oleg@...hat.com>, Paul Turner <pjt@...gle.com>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/5] Reduce runqueue lock contention -v2

On Thu, 2010-12-16 at 11:39 -0800, Frank Rowand wrote:
>   select_task_rq() uses the smp_processor_id() of the old task_cpu(p) instead
>   of the waking smp_processor_id().

So first you bounce the wakeup to the previous task cpu, when you do
select_task_rq() and then you bounce it to the new target?


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