linux-kernel - Re: default cpufreq gov, was: [PATCH] sched/fair: check for idle core

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Message-ID: <CAKfTPtDUMdxWSKQgyjPCn+D-zYzpfgMEy0WYGAQzhcr1jnAX7w@mail.gmail.com>
Date:   Thu, 22 Oct 2020 17:55:24 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     A L <mail@...hevalier.se>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Julia Lawall <julia.lawall@...ia.fr>,
        Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...hat.com>,
        kernel-janitors@...r.kernel.org,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Gilles Muller <Gilles.Muller@...ia.fr>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Len Brown <len.brown@...el.com>
Subject: Re: default cpufreq gov, was: [PATCH] sched/fair: check for idle core

On Thu, 22 Oct 2020 at 17:45, A L <mail@...hevalier.se> wrote:
>
>
>
> ---- From: Peter Zijlstra <peterz@...radead.org> -- Sent: 2020-10-22 - 14:29 ----
>
> > On Thu, Oct 22, 2020 at 02:19:29PM +0200, Rafael J. Wysocki wrote:
> >> > However I do want to retire ondemand, conservative and also very much
> >> > intel_pstate/active mode.
> >>
> >> I agree in general, but IMO it would not be prudent to do that without making
> >> schedutil provide the same level of performance in all of the relevant use
> >> cases.
> >
> > Agreed; I though to have understood we were there already.
>
> Hi,
>
>
> Currently schedutil does not populate all stats like ondemand does, which can be a problem for some monitoring software.
>
> On my AMD 3000G CPU with kernel-5.9.1:
>
>
> grep. /sys/devices/system/cpu/cpufreq/policy0/stats/*
>
> With ondemand:
> time_in_state:3900000 145179
> time_in_state:1600000 9588482
> total_trans:177565
> trans_table:   From  :    To
> trans_table:         :   3900000   1600000
> trans_table:  3900000:         0     88783
> trans_table:  1600000:     88782         0
>
> With schedutil only two file exists:
> reset:<empty>
> total_trans:216609
>
>
> I'd really like to have these stats populated with schedutil, if that's possible.

Your problem might have been fixed with
commit 96f60cddf7a1 ("cpufreq: stats: Enable stats for fast-switch as well")


>
> Thanks.
>