linux-kernel - Re: [PATCH v2] sched/fair: Age the average idle time

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Message-ID: <20210615204228.GB4272@worktop.programming.kicks-ass.net>
Date:   Tue, 15 Jun 2021 22:42:28 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] sched/fair: Age the average idle time

On Tue, Jun 15, 2021 at 12:16:11PM +0100, Mel Gorman wrote:
> From: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> This is a partial forward-port of Peter Ziljstra's work first posted
> at https://lore.kernel.org/lkml/20180530142236.667774973@infradead.org/.

It's patches 2 and 3 together, right?

> His Signed-off has been removed because it is modified but will be restored
> if he says it's still ok.

I suppose the SoB will auto-magically re-appear if I apply it :-)

> The patch potentially matters when a socket was multiple LLCs as the
> maximum search depth is lower. However, some of the test results were
> suspiciously good (e.g. specjbb2005 gaining 50% on a Zen1 machine) and
> other results were not dramatically different to other mcahines.
> 
> Given the nature of the patch, Peter's full series is not being forward
> ported as each part should stand on its own. Preferably they would be
> merged at different times to reduce the risk of false bisections.

I'm tempted to give it a go.. anyone object?