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

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Date:   Fri, 23 Oct 2020 10:41:12 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     A L <mail@...hevalier.se>, Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        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 22-10-20, 17:55, Vincent Guittot wrote:
> 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 Vincent. Right, I have already fixed that for everyone.

-- 
viresh