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

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Message-ID: <CABk29NsXc6J_zM+WaZxdjLtx_NC6+86VpMrtXrGZZ4WoQ_PPvg@mail.gmail.com>
Date:   Tue, 1 Mar 2022 16:41:57 -0800
From:   Josh Don <joshdon@...gle.com>
To:     Abel Wu <wuyun.abel@...edance.com>
Cc:     Mel Gorman <mgorman@...e.de>, 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>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/5] introduce sched-idle balancing

On Fri, Feb 25, 2022 at 5:36 AM Abel Wu <wuyun.abel@...edance.com> wrote:
[snip]
> > Also place the filter first and do any measurements of any change to
> > balancing versus the filter. I'm suggesting placing the filter first
> > because it's less controversial than a new balancer. Just be aware that
> > the filter alone is not a guarantee of merging as there have been a few
> > approaches to filtering and so far all of them had downsides on either cost
>
> Yes, understood. I will adjust the patches as you suggested and send v2
> together with more tests next week.

+1 to trying the filter rather than introducing a new balance path.

We've found the sched_idle_cpu() checks in the wakeup path to be
adequate in allowing non-idle tasks to fully consume cpu resources
(but that of course relies on wakeup balancing, and not periodic
balancing).

Please cc me on the next series.

Thanks,
Josh