linux-kernel - Re: [PATCH 4/4] sched/fair: Add more core cookie check in wake up fast path

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Message-ID: <20251120103001.978744-1-sieberf@amazon.com>
Date: Thu, 20 Nov 2025 12:30:00 +0200
From: Fernand Sieber <sieberf@...zon.com>
To: K Prateek Nayak <kprateek.nayak@....com>
CC: <mingo@...hat.com>, <peterz@...radead.org>,
	<linux-kernel@...r.kernel.org>, <juri.lelli@...hat.com>,
	<vincent.guittot@...aro.org>, <dietmar.eggemann@....com>,
	<rostedt@...dmis.org>, <bsegall@...gle.com>, <mgorman@...e.de>,
	<vschneid@...hat.com>, <dwmw@...zon.co.uk>, <jschoenh@...zon.de>,
	<liuyuxua@...zon.com>
Subject: Re: [PATCH 4/4] sched/fair: Add more core cookie check in wake up fast path

Hi Prateek,

On 9/24/2025 9:51 AM, K Prateek Nayak wrote:
> Yes, that would be great! Thank you. And also please include some
> benchmark numbers either in improved core utilization or the benchmark
> results actually improving from these changes.
>
> It would be great to know how much things improve by :)

I've run some benchmarking and I've determined most of the perf gains I
observed can be isolated to a subset of the changes in this series.
Therefore I've repackaged it in a single patch, which also considers
other feedback gathered in this series:

https://lore.kernel.org/lkml/20251120101955.968586-1-sieberf@amazon.com/T/#u

I've also included benchmark test results. This current patch series can
be cancelled in favor of the new patch.

--
Thanks,
Fernand



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