linux-kernel - Re: [PATCH v4] cpufreq: schedutil: rate limits for SCHED

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Date:   Wed, 14 Mar 2018 12:20:38 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Joel Fernandes <joelaf@...gle.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Claudio Scordino <claudio@...dence.eu.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Todd Kjos <tkjos@...roid.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] cpufreq: schedutil: rate limits for SCHED_DEADLINE

On Wednesday, March 14, 2018 2:27:53 AM CET Joel Fernandes wrote:
> On Tue, Mar 13, 2018 at 4:15 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > On 13-03-18, 11:35, Claudio Scordino wrote:
> >> When the SCHED_DEADLINE scheduling class increases the CPU utilization,
> >> we should not wait for the rate limit, otherwise we may miss some
> >> deadline.
> >>
> >> Tests using rt-app on Exynos5422 with up to 10 SCHED_DEADLINE tasks have
> >> shown reductions of even 10% of deadline misses with a negligible
> >> increase of energy consumption (measured through Baylibre Cape).
> >>
> >> Signed-off-by: Claudio Scordino <claudio@...dence.eu.com>
> >> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> >> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >> CC: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >> CC: Viresh Kumar <viresh.kumar@...aro.org>
> >> CC: Patrick Bellasi <patrick.bellasi@....com>
> >> CC: Dietmar Eggemann <dietmar.eggemann@....com>
> >> CC: Morten Rasmussen <morten.rasmussen@....com>
> >> CC: Juri Lelli <juri.lelli@...hat.com>
> >> CC: Vincent Guittot <vincent.guittot@...aro.org>
> >> CC: Todd Kjos <tkjos@...roid.com>
> >> CC: Joel Fernandes <joelaf@...gle.com>
> >> CC: linux-pm@...r.kernel.org
> >> CC: linux-kernel@...r.kernel.org
> >> ---
> >> Changes from v3:
> >>  - Specific routine renamed as ignore_dl_rate_limit()
> >
> > LGTM. Thanks.
> 
> Nice! Thanks.

OK, the patch doesn't seem to depend on anything in -tip, so I'm going to
apply it.

Thanks!