linux-kernel - Re: [PATCH 3/3] sched/numa: Limit the amount of imbalance that can exist at fork time

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Message-ID: <CAKfTPtDQgv8RCe1RRCGg0px0Bp6GbdAhXbRKTH5zeVaRDmK+vg@mail.gmail.com>
Date:   Tue, 17 Nov 2020 15:31:19 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH 3/3] sched/numa: Limit the amount of imbalance that can
 exist at fork time

On Tue, 17 Nov 2020 at 15:18, Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Tue, Nov 17, 2020 at 01:42:22PM +0000, Mel Gorman wrote:
> > -                     if (local_sgs.idle_cpus)
> > +                     if (local_sgs.idle_cpus >= (sd->span_weight >> 2))
> >                               return NULL;
>
> Is that the same 25% ?

same question for me
could we encapsulate this 25% allowed imbalance like for adjust_numa_imbalance