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Date:   Thu, 23 Sep 2021 14:41:06 +0200
From:   Vincent Guittot <>
To:     Mike Galbraith <>
Cc:     Mel Gorman <>,
        Peter Zijlstra <>,
        Ingo Molnar <>,
        Valentin Schneider <>,
        Aubrey Li <>,
        Barry Song <>,
        Srikar Dronamraju <>,
        LKML <>
Subject: Re: [PATCH 2/2] sched/fair: Scale wakeup granularity relative to nr_running

On Thu, 23 Sept 2021 at 11:22, Mike Galbraith <> wrote:
> On Thu, 2021-09-23 at 10:40 +0200, Vincent Guittot wrote:
> >
> > a 100us value should even be enough to fix Mel's problem without
> > impacting common wakeup preemption cases.
> It'd be nice if it turn out to be something that simple, but color me
> skeptical.  I've tried various preemption throttling schemes, and while

Let's see what the results will show. I tend to agree that this will
not be enough to cover all use cases and I don't see any other way to
cover all cases than getting some inputs from the threads about their
latency fairness which bring us back to some kind of latency niceness

> it was trivial to get promising results, my scheme always managed to
> harm something.  Everything I ever tried, I ended up tossing.
>         -Mike

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