linux-kernel - Re: [RFC PATCH 0/5] introduce sched-idle balancing

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Message-ID: <CAKfTPtB_GGb2eZqWfmKrY3-Z9spN9wzU4pXMGz38bAZu8ExCMQ@mail.gmail.com>
Date:   Thu, 24 Feb 2022 16:29:06 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Abel Wu <wuyun.abel@...edance.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Mel Gorman <mgorman@...e.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] introduce sched-idle balancing

On Thu, 24 Feb 2022 at 16:20, Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Thu, Feb 17, 2022 at 11:43:56PM +0800, Abel Wu wrote:
> > Current load balancing is mainly based on cpu capacity
> > and task util, which makes sense in the POV of overall
> > throughput. While there still might be some improvement
> > can be done by reducing number of overloaded cfs rqs if
> > sched-idle or idle rq exists.
>
> I'm much confused, there is an explicit new-idle balancer and a periodic
> idle balancer already there.

I agree, You failed to explain why newly_idle and periodic idle load
balance are not enough and we need this new one