linux-kernel - Re: [PATCH RFC v2 4/4] sched: cpufreq_cfs: pelt-based cpu frequency scaling

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Message-ID: <5577D7DB.5020802@linaro.org>
Date:	Wed, 10 Jun 2015 14:23:23 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	Michael Turquette <mturquette@...aro.org>, peterz@...radead.org,
	mingo@...nel.org
CC:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	preeti@...ux.vnet.ibm.com, Morten.Rasmussen@....com,
	riel@...hat.com, efault@....de, nicolas.pitre@...aro.org,
	daniel.lezcano@...aro.org, dietmar.eggemann@....com,
	vincent.guittot@...aro.org, amit.kucheria@...aro.org,
	juri.lelli@....com, rjw@...ysocki.net, viresh.kumar@...aro.org,
	ashwin.chaugule@...aro.org, abelvesa@...il.com
Subject: Re: [PATCH RFC v2 4/4] sched: cpufreq_cfs: pelt-based cpu frequency
 scaling



On 05/12/2015 10:13 AM, Michael Turquette wrote:
> This governor is event-driven. There is no polling loop to check cpu
> idle time nor any other method which is unsynchronized with the
> scheduler. The entry points for this policy are in fair.c:
> enqueue_task_fair, dequeue_task_fair and task_tick_fair.
> 
> This policy is implemented using the cpufreq governor interface for two
> main reasons:
> 
> 1) re-using the cpufreq machine drivers without using the governor
> interface is hard.
> 
> 2) using the cpufreq interface allows us to switch between the
> scheduler-driven policy and legacy cpufreq governors such as ondemand at
> run-time. This is very useful for comparative testing and tuning.

Hi, Mike,

Did you have some testing data with your patch?
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