linux-kernel - Re: [RFC PATCH V3 6/6] sched/fair: Implement starvation monitor

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Message-ID: <CAEXW_YTea1LdPkcwPDw5wdvM+205k4eFfaM_DwhvGKB8rCn_Ug@mail.gmail.com>
Date:   Wed, 14 Jun 2023 14:27:38 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Valentin Schneider <vschneid@...hat.com>,
        linux-kernel@...r.kernel.org,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vineeth Pillai <vineeth@...byteword.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [RFC PATCH V3 6/6] sched/fair: Implement starvation monitor

On Wed, Jun 14, 2023 at 10:15 AM Juri Lelli <juri.lelli@...hat.com> wrote:
>
> Hey,
[..]
> > By postponing the enqueue/replanishment of the DL server here, we are fixing the
> > problem in a practical way, that works without breaking existing useful properties &
> > use-cases.
>
> In my understanding, if we simply postpone actual activation of the DL
> server up to the point it really needs to boost/run for giving CFS tasks
> some breath (the infamous 0-laxity :), we save RT tasks from useless
> interruptions and still can keep EDF/CBS working w/o much changes.
>
> It looks like a low hanging fruit, small improvement on what we have today
> than doesn't prevent us for implementing more complex features (i.e., full
> blown hierarchical scheduling, alternative schedulers) in the future if
> the need arises.

Agreed, thanks!

 - Joel