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

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2020-10-22T16:01:28Z

---- 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.

Thanks.