linux-kernel - Re: Re: [RFC PATCH 1/2] Revert "sched/fair: Make sched-idle CPU selection consistent throughout"

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Message-ID: <4f7633d4-a1aa-4528-a463-552163e7a47b@bytedance.com>
Date: Thu, 20 Mar 2025 22:35:23 +0800
From: Abel Wu <wuyun.abel@...edance.com>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: K Prateek Nayak <kprateek.nayak@....com>, Ingo Molnar <mingo@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Josh Don <joshdon@...gle.com>, Tianchen Ding <dtcccc@...ux.alibaba.com>,
 Viresh Kumar <viresh.kumar@...aro.org>,
 "open list:SCHEDULER" <linux-kernel@...r.kernel.org>
Subject: Re: Re: [RFC PATCH 1/2] Revert "sched/fair: Make sched-idle CPU
 selection consistent throughout"

On 3/19/25 6:58 PM, Vincent Guittot wrote:
> On Wed, 19 Mar 2025 at 11:36, Abel Wu <wuyun.abel@...edance.com> wrote:
>>
>> What do you think to choose a less loaded cpu if no idle ones available?
>> So the wakee will probably get better served, and also helps load balance.
> 
> I'm not a fan of adding more than idle selection and we already
> compared load in wake_affine.
> So we should only look at a cpu that we can preempt immediately: idle
> cpus or cpus with full hierarchy sched idle entities

OK, I will have a try. Thanks!