linux-kernel - Re: [PATCH v3 0/3] cpufreq: avoid redundant driver calls in schedutil

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Date:	Thu, 14 Jul 2016 11:00:14 -0700
From:	Steve Muckle <steve.muckle@...aro.org>
To:	Pingbo Wen <pingbo.wen@...aro.org>
Cc:	Steve Muckle <steve.muckle@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Juri Lelli <Juri.Lelli@....com>,
	Patrick Bellasi <patrick.bellasi@....com>
Subject: Re: [PATCH v3 0/3] cpufreq: avoid redundant driver calls in schedutil

On Thu, Jul 14, 2016 at 06:02:31PM +0800, Pingbo Wen wrote:
> > Steve Muckle (3):
> >   cpufreq: add cpufreq_driver_resolve_freq()
> >   cpufreq: schedutil: map raw required frequency to driver frequency
> 
> Tested the first two patches on db410c, only waking up irq_work 53
> times, while previous was 257 times(79% decrease) in Android home idle
> for 5 minutes.

Thanks Pingbo. My experience measuring the number of calls into the acpi
cpufreq fast switch path was similar. An arbitrary system workload I
chose showed a ~75% reduction in calls.

thanks,
Steve