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Date:   Tue, 5 Oct 2021 11:32:04 +0200
From:   Peter Zijlstra <>
To:     Mel Gorman <>
Cc:     Mike Galbraith <>, Ingo Molnar <>,
        Vincent Guittot <>,
        Valentin Schneider <>,
        Aubrey Li <>,
        Barry Song <>,
        Srikar Dronamraju <>,
        LKML <>
Subject: Re: [PATCH 2/2] sched/fair: Scale wakeup granularity relative to

On Wed, Sep 22, 2021 at 02:20:02PM +0100, Mel Gorman wrote:
> Note that the TuneD throughput-performance profile allows up to 15ms
> for sysctl_sched_latency (ignoring scaling) but there is no explanation
> why such a long period was necessary or why sched_latency_ns is also
> not adjusted. The intent may have been to disable wakeup preemption
> or it might be an oversight.  An internet search for instances where
> sysctl_sched_wakeup_granularity parameter are tuned to high values offer
> either no explanation or a broken one.

FWIW, if one wants to disable wakeup preemption, we've got SCHED_BATCH
for that.

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