linux-kernel - Re: [PATCH] sched/fair: fix case with reduced capacity CPU

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Date:   Thu, 7 Jul 2022 08:42:32 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Zhang Qiao <zhangqiao22@...wei.com>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        linux-kernel@...r.kernel.org, david.chen@...anix.com
Subject: Re: [PATCH] sched/fair: fix case with reduced capacity CPU

On Tue, 5 Jul 2022 at 10:23, Zhang Qiao <zhangqiao22@...wei.com> wrote:
>
>
>
> 在 2022/7/2 12:52, Vincent Guittot 写道:
> > The capacity of the CPU available for CFS tasks can be reduced because of
> > other activities running on the latter. In such case, it's worth trying to
> > move CFS tasks on a CPU with more available capacity.
> >
> > The rework of the load balance has filterd the case when the CPU is
> > classified to be fully busy but its capacity is reduced.
> >
> > Check if CPU's capacity is reduced while gathering load balance statistics
> > and classify it group_misfit_task instead of group_fully_busy so we can
> > try to move the load on another CPU.
> >
> > Reported-by: David Chen <david.chen@...anix.com>
> > Reported-by: Zhang Qiao <zhangqiao22@...wei.com>
> > Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> > ---
> >
> > David, Zhang,
> >
> > I haven't put your tested-by because I have reworked and cleaned the patch to
> > cover more cases.
> >
> > Could you run some tests with this version ?
>
> I tested with this version, it is ok.
>
> Tested-by: Zhang Qiao <zhangqiao22@...wei.com>

Thanks

>
> Thanks
>
> >

> >