linux-kernel - Re: [PATCH v3 04/10] sched/fair: rework load

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Date:   Tue, 8 Oct 2019 20:47:12 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>,
        Hillf Danton <hdanton@...a.com>
Subject: Re: [PATCH v3 04/10] sched/fair: rework load_balance

On Tue, 8 Oct 2019 at 19:55, Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Thu, Sep 19, 2019 at 09:33:35AM +0200, Vincent Guittot wrote:
> > +     if (busiest->group_type == group_asym_packing) {
> > +             /*
> > +              * In case of asym capacity, we will try to migrate all load to
> > +              * the preferred CPU.
> > +              */
> > +             env->balance_type = migrate_load;
> >               env->imbalance = busiest->group_load;
> >               return;
> >       }
>
> I was a bit surprised with this; I sorta expected a migrate_task,1 here.

I have just kept current mechanism

>
> The asym_packing thing has always been a nr_running issue to me. If
> there is something to run, we should run on as many siblings/cores as
> possible, but preferably the 'highest' ranked siblings/cores.

I can probably set the number of running task to migrate instead of the load
>