linux-kernel - Re: [RFC][PATCH 08/10] sched/fair: Implement delayed dequeue

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Date: Thu, 23 May 2024 10:45:48 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Luis Machado <luis.machado@....com>
Cc: mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
	linux-kernel@...r.kernel.org, kprateek.nayak@....com,
	wuyun.abel@...edance.com, tglx@...utronix.de, efault@....de,
	nd <nd@....com>, John Stultz <jstultz@...gle.com>,
	Hongyan.Xia2@....com
Subject: Re: [RFC][PATCH 08/10] sched/fair: Implement delayed dequeue

On Mon, Apr 29, 2024 at 03:33:04PM +0100, Luis Machado wrote:

> (2) m6.6-eevdf-complete: m6.6-stock plus this series.
> (3) m6.6-eevdf-complete-no-delay-dequeue: (2) + NO_DELAY_DEQUEUE

> +------------+------------------------------------------------------+-----------+
> |  cluster   |                         tag                          | perc_diff |
> +------------+------------------------------------------------------+-----------+
> |    CPU     |                   m6.6-stock                         |   0.0%    |
> |  CPU-Big   |                   m6.6-stock                         |   0.0%    |
> | CPU-Little |                   m6.6-stock                         |   0.0%    |
> |  CPU-Mid   |                   m6.6-stock                         |   0.0%    |
> |    GPU     |                   m6.6-stock                         |   0.0%    |
> |   Total    |                   m6.6-stock                         |   0.0%    |

> |    CPU     |        m6.6-eevdf-complete-no-delay-dequeue          |  117.77%  |
> |  CPU-Big   |        m6.6-eevdf-complete-no-delay-dequeue          |  113.79%  |
> | CPU-Little |        m6.6-eevdf-complete-no-delay-dequeue          |  97.47%   |
> |  CPU-Mid   |        m6.6-eevdf-complete-no-delay-dequeue          |  189.0%   |
> |    GPU     |        m6.6-eevdf-complete-no-delay-dequeue          |  -6.74%   |
> |   Total    |        m6.6-eevdf-complete-no-delay-dequeue          |  103.84%  |

This one is still flummoxing me. I've gone over the patch a few times on
different days and I'm not seeing it. Without DELAY_DEQUEUE it should
behave as before.

Let me try and split this patch up into smaller parts such that you can
try and bisect this.