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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAJWu+orsBLQdjGJZKOnLP15M-aKboiDPVTQ2W+8tiHpgNLexMg@mail.gmail.com>
Date:   Tue, 13 Mar 2018 18:27:53 -0700
From:   Joel Fernandes <joelaf@...gle.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Claudio Scordino <claudio@...dence.eu.com>,
        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 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.

- Joel