linux-kernel - Re: [PATCH 2/5] sched/fair: rename sum_nr_running to sum_h_nr

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Message-ID: <CAKfTPtATBXgp47=gv=yVQ0rox9qr1H3DOXCSngmcZvAmqt-GTg@mail.gmail.com>
Date:   Fri, 26 Jul 2019 10:41:30 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [PATCH 2/5] sched/fair: rename sum_nr_running to sum_h_nr_running

On Fri, 26 Jul 2019 at 04:17, Srikar Dronamraju
<srikar@...ux.vnet.ibm.com> wrote:
>
> * Vincent Guittot <vincent.guittot@...aro.org> [2019-07-19 09:58:22]:
>
> > sum_nr_running will track rq->nr_running task and sum_h_nr_running
> > will track cfs->h_nr_running so we can use both to detect when other
> > scheduling class are running and preempt CFS.
> >
> > There is no functional changes.
> >
> > Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> > ---
> >
> >       ld_moved = 0;
> > -     if (busiest->nr_running > 1) {
> > +     if (busiest->cfs.h_nr_running > 1) {
>
> We should be looking for nr_running here.
> There could be only one cfs task but that may not be the current running
> task, so it could be a good one to be picked for load balancing.
>
> No?

Yes you're right.
That's what i have done on the new version that I'm preparing


>
> >               /*
> >                * Attempt to move tasks. If find_busiest_group has found
> >                * an imbalance but busiest->nr_running <= 1, the group is
> > --
> > 2.7.4
> >
>
> --
> Thanks and Regards
> Srikar Dronamraju
>