linux-kernel - Re: [RESEND PATCH 2/2] sched/fair: Optimize __update_sched

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Message-ID: <20170410084038.eg6nyyle6jwt5rmb@hirez.programming.kicks-ass.net>
Date:   Mon, 10 Apr 2017 10:40:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Paul Turner <pjt@...gle.com>, Yuyang Du <yuyang.du@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Benjamin Segall <bsegall@...gle.com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Mike Galbraith <umgwanakikbuti@...il.com>
Subject: Re: [RESEND PATCH 2/2] sched/fair: Optimize __update_sched_avg()

On Mon, Apr 10, 2017 at 08:39:10AM +0100, Dietmar Eggemann wrote:

> Are you planning to get rid of scale_load_down() for weight because of
> the correctness problems of the signal mentioned by Paul in this thread?

Yes; it would be good to (again) use all 20 bits of weight for the
load_avg things. It was one of the reasons we went to 20 in the first
place after all.

The patch was a quick draft and known broken, but thanks for having a
look.