linux-kernel - Re: [PATCH 0/2] Reduce SIS scanning

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Message-ID: <20210804131129.GF8057@worktop.programming.kicks-ass.net>
Date:   Wed, 4 Aug 2021 15:11:29 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Song Bao Hua <song.bao.hua@...ilicon.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Reduce SIS scanning

On Wed, Aug 04, 2021 at 12:58:55PM +0100, Mel Gorman wrote:
> This is the first two patches from "Modify and/or delete SIS_PROP" and
> focues on improving the hit rate for recent_used_cpu and avoids rescanning
> the target CPU when it's known to be busy. These are relatively simply
> patches in comparison to the full series which could be a regression
> magnet and that series had at least one mistake in it.
> 
> In general, the usual suspects showed mostly small gains with a few
> exceptions.  Usual suspects were NAS, hackbench, schbench (Facebook
> latency-sensitive workload), perf pipe, kernel building, git test suite,
> dbench and redis.
> 
> From here, the next obvious candidates are either improving has_idle_cores
> or continuing to try remove/improve SIS_PROP.

Thanks!