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Date:   Fri, 8 Jan 2021 20:45:44 +0100
From:   Peter Zijlstra <>
To:     Vincent Guittot <>
Cc:     Mel Gorman <>,
        "Li, Aubrey" <>,
        linux-kernel <>,
        Ingo Molnar <>,
        Juri Lelli <>,
        Valentin Schneider <>,
        Qais Yousef <>,
        Dietmar Eggemann <>,
        Steven Rostedt <>,
        Ben Segall <>,
        Tim Chen <>,
        Jiang Biao <>
Subject: Re: [RFC][PATCH 1/5] sched/fair: Fix select_idle_cpu()s cost

On Fri, Jan 08, 2021 at 04:10:51PM +0100, Vincent Guittot wrote:
> Also, there is another problem (that I'm investigating)  which is that
> this_rq()->avg_idle is stalled when your cpu is busy. Which means that
> this avg_idle can just be a very old and meaningless value. I think
> that we should decay it periodically to reflect there is less and less


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