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

Viresh Kumar
2020-10-23T05:11:19Z

On 22-10-20, 17:55, Vincent Guittot wrote:
> On Thu, 22 Oct 2020 at 17:45, A L <mail@lechevalier.se> wrote:
> >
> >
> >
> > ---- From: Peter Zijlstra <peterz@infradead.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