linux-kernel - Re: [PATCH v2] sched/fair: unlink misfit task from cpu overutilized

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Message-ID: <487f0252-c697-eb62-989d-57ee731691a2@arm.com>
Date:   Mon, 16 Jan 2023 09:21:20 +0000
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Qais Yousef <qyousef@...alina.io>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Kajetan Puchalski <kajetan.puchalski@....com>, mingo@...nel.org,
        peterz@...radead.org, rafael@...nel.org, viresh.kumar@...aro.org,
        vschneid@...hat.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, lukasz.luba@....com, wvw@...gle.com,
        xuewen.yan94@...il.com, han.lin@...iatek.com,
        Jonathan.JMChen@...iatek.com
Subject: Re: [PATCH v2] sched/fair: unlink misfit task from cpu overutilized

On 14/01/2023 22:18, Qais Yousef wrote:
> On 01/13/23 15:28, Vincent Guittot wrote:
>> Hi Kajetan,
>>
>> On Fri, 13 Jan 2023 at 14:50, Kajetan Puchalski
>> <kajetan.puchalski@....com> wrote:

[...]

>>> sched/uclamp: Fix a uninitialized variable warnings
>>> (baseline_ufc) sched/fair: Check if prev_cpu has highest spare cap in feec()
>>> sched/uclamp: Cater for uclamp in find_energy_efficient_cpu()'s early exit condition
>>> sched/uclamp: Make cpu_overutilized() use util_fits_cpu()
>>> sched/uclamp: Make asym_fits_capacity() use util_fits_cpu()
>>> sched/uclamp: Make select_idle_capacity() use util_fits_cpu()
>>> sched/uclamp: Fix fits_capacity() check in feec()
>>> sched/uclamp: Make task_fits_capacity() use util_fits_cpu()
>>> sched/uclamp: Fix relationship between uclamp and migration margin
>>> (previous 'baseline' was here)
>>>
>>> I omitted the 3 patches relating directly to capacity_inversion but in
> 
> This could lead to confusion. Was there a specific reason for this omission?
> Did you hit some problem?

I thought Vincent's 'split MF from CPU OU' should replace 'CapInv'?

https://lkml.kernel.org/r/20221209164739.GA24368@vingu-book

... I have reverted patches:
Revert "sched/fair: Detect capacity inversion"
Revert "sched/fair: Consider capacity inversion in util_fits_cpu()"
Revert "sched/uclamp: Make cpu_overutilized() use util_fits_cpu()" ...

You also mentioned this in
https://lkml.kernel.org/r/<20230115001906.v7uq4ddodrbvye7d@...buntu

[...]