linux-kernel - Re: [PATCH 00/24] Complete EEVDF

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Message-ID: <20241106110925.GK24862@noisy.programming.kicks-ass.net>
Date: Wed, 6 Nov 2024 12:09:25 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: Saravana Kannan <saravanak@...gle.com>, Samuel Wu <wusamuel@...gle.com>,
	David Dai <davidai@...gle.com>, mingo@...hat.com,
	juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org,
	wuyun.abel@...edance.com, youssefesmat@...omium.org,
	tglx@...utronix.de, efault@....de,
	Android Kernel Team <kernel-team@...roid.com>,
	Qais Yousef <qyousef@...gle.com>,
	Vincent Palomares <paillon@...gle.com>,
	John Stultz <jstultz@...gle.com>,
	Luis Machado <luis.machado@....com>
Subject: Re: [PATCH 00/24] Complete EEVDF

On Wed, Nov 06, 2024 at 11:49:00AM +0530, K Prateek Nayak wrote:

> Since delayed entities are still on the runqueue, they can affect PELT
> calculation. Vincent and Dietmar have both noted this and Peter posted
> https://lore.kernel.org/lkml/172595576232.2215.18027704125134691219.tip-bot2@tip-bot2/
> in response but it was pulled out since Luis reported observing -ve
> values for h_nr_delayed on his setup. A lot has been fixed around
> delayed dequeue since and I wonder if now would be the right time to
> re-attempt h_nr_delayed tracking.

Yeah, it's something I meant to get back to. I think the patch as posted
was actually right and it didn't work for Luis because of some other,
since fixed issue.

But I might be misremembering things. I'll get to it eventually :/