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

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Message-ID: <c232b2.c086afce.17550fc4644@lechevalier.se>
Date:   Thu, 22 Oct 2020 17:45:11 +0200 (GMT+02:00)
From:   A L <mail@...hevalier.se>
To:     Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     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>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        linux-kernel@...r.kernel.org,
        Valentin Schneider <valentin.schneider@....com>,
        Gilles Muller <Gilles.Muller@...ia.fr>,
        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



---- 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.

Thanks.