linux-kernel - Re: [PATCH v5 07/12] sched: test the cpu's capacity in wake affine

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Message-ID: <20140910141905.GR3190@worktop.ger.corp.intel.com>
Date:	Wed, 10 Sep 2014 16:19:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	preeti@...ux.vnet.ibm.com, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, riel@...hat.com,
	Morten.Rasmussen@....com, efault@....de, nicolas.pitre@...aro.org,
	linaro-kernel@...ts.linaro.org, daniel.lezcano@...aro.org,
	dietmar.eggemann@....com
Subject: Re: [PATCH v5 07/12] sched: test the cpu's capacity in wake affine

On Tue, Aug 26, 2014 at 01:06:50PM +0200, Vincent Guittot wrote:
> Currently the task always wakes affine on this_cpu if the latter is idle.
> Before waking up the task on this_cpu, we check that this_cpu capacity is not
> significantly reduced because of RT tasks or irq activity.
> 
> Use case where the number of irq and/or the time spent under irq is important
> will take benefit of this because the task that is woken up by irq or softirq
> will not use the same CPU than irq (and softirq) but a idle one.
> 
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>

Rik, you've been 'fighting' wake_affine, any objections?
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