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

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Message-ID: <20180313111506.GC15832@vireshk-i7>
Date:   Tue, 13 Mar 2018 16:45:06 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     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>,
        Joel Fernandes <joelaf@...gle.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] cpufreq: schedutil: rate limits for SCHED_DEADLINE

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.

-- 
viresh