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

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Message-ID: <20240523093338.GJ40213@noisy.programming.kicks-ass.net>
Date: Thu, 23 May 2024 11:33:38 +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 Thu, May 23, 2024 at 10:06:04AM +0100, Luis Machado wrote:

> Booting the kernel with NO_DELAY_DEQUEUE (default to false), things work fine. Then
> if I switch to DELAY_DEQUEUE at runtime, things start using a lot more power.
> 
> The interesting bit is if I switch to NO_DELAY_DEQUEUE again at runtime, things don't
> go back to normal. Rather they stay the same, using a lot more energy.

Ooh, cute.. weird. I'll try and see if we leak state somehow.