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From: Steve Muckle <steve.muckle@linaro.org>
X-Google-Original-From: Steve Muckle <smuckle@linaro.org>
Date: Thu, 14 Jul 2016 11:00:14 -0700
To: Pingbo Wen <pingbo.wen@linaro.org>
Cc: Steve Muckle <steve.muckle@linaro.org>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Viresh Kumar <viresh.kumar@linaro.org>, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, Vincent Guittot <vincent.guittot@linaro.org>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Juri Lelli <Juri.Lelli@arm.com>,
        Patrick Bellasi <patrick.bellasi@arm.com>
Subject: Re: [PATCH v3 0/3] cpufreq: avoid redundant driver calls in schedutil
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 <57876337.6090409@linaro.org>
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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