linux-kernel - Re: [PATCH v3 0/2] Rework interface between scheduler and schedutil governor

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Date:   Mon, 6 Nov 2023 16:05:40 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        rafael@...nel.org, viresh.kumar@...aro.org, qyousef@...alina.io,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        lukasz.luba@....com, wyes.karny@....com, beata.michalska@....com
Subject: Re: [PATCH v3 0/2] Rework interface between scheduler and schedutil governor

On Fri, Nov 3, 2023 at 2:18 PM Vincent Guittot
<vincent.guittot@...aro.org> wrote:
>
> Following the discussion with Qais [1] about how to handle uclamp
> requirements and after syncing with him, we agreed that I should move
> forward on the patchset to rework the interface between scheduler and
> schedutil governor to provide more information to the latter. Scheduler
> (and EAS in particular) doesn't need anymore to guess estimate which
> headroom the governor wants to apply and will directly ask for the target
> freq. Then the governor directly gets the actual utilization and new
> minimum and maximum boundaries to select this target frequency and
> doesn't have to deal anymore with scheduler internals like uclamp when
> including iowait boost.
>
> [1] https://lore.kernel.org/lkml/CAKfTPtA5JqNCauG-rP3wGfq+p8EEVx9Tvwj6ksM3SYCwRmfCTg@mail.gmail.com/
>
> Changes since v2:
> - remove useless target variable
>
> Changes since v1:
> - fix a bug (always set max even when returning early)
> - fix typos
>
> Vincent Guittot (2):
>   sched/schedutil: Rework performance estimation
>   sched/schedutil: Rework iowait boost
>
>  include/linux/energy_model.h     |  1 -
>  kernel/sched/core.c              | 82 ++++++++++++-------------------
>  kernel/sched/cpufreq_schedutil.c | 69 ++++++++++++++++----------
>  kernel/sched/fair.c              | 22 +++++++--
>  kernel/sched/sched.h             | 84 +++-----------------------------
>  5 files changed, 100 insertions(+), 158 deletions(-)
>
> --

For the schedutil changes in the series:

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

and I'm assuming this series to be targeted at sched.