linux-kernel - Re: [PATCH] sched/fair: Use recent_used_cpu to test p->cpus

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Message-ID: <20230621113233.GC2053369@hirez.programming.kicks-ass.net>
Date:   Wed, 21 Jun 2023 13:32:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...e.de>
Cc:     Miaohe Lin <linmiaohe@...wei.com>, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        bristot@...hat.com, vschneid@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/fair: Use recent_used_cpu to test p->cpus_ptr

On Wed, Jun 21, 2023 at 11:19:15AM +0100, Mel Gorman wrote:
> On Tue, Jun 20, 2023 at 04:07:47PM +0800, Miaohe Lin wrote:
> > When checking whether a recently used CPU can be a potential idle
> > candidate, recent_used_cpu should be used to test p->cpus_ptr as
> > p->recent_used_cpu is not equal to recent_used_cpu and candidate
> > decision is made based on recent_used_cpu here.
> > 
> > Fixes: 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu")
> 
> Acked-by: Mel Gorman <mgorman@...e.de>

Thanks!