linux-kernel - Re: [PATCH v3 07/12] sched: test the cpu's capacity in wake affine

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Date:	Tue, 08 Jul 2014 23:12:23 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>, peterz@...radead.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org
CC:	preeti@...ux.vnet.ibm.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 v3 07/12] sched: test the cpu's capacity in wake affine

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On 06/30/2014 12:05 PM, 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 which share its cache.
> 
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>

Acked-by: Rik van Riel <riel@...hat.com>


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