linux-kernel - Re: [RFC PATCH 24/24] sched/time: Introduce CLOCK_THREAD_DVFS

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Message-ID: <ZqdKbcu-iyzmr85r@jlelli-thinkpadt14gen4.remote.csb>
Date: Mon, 29 Jul 2024 09:53:17 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: mingo@...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,
	kprateek.nayak@....com, wuyun.abel@...edance.com,
	youssefesmat@...omium.org, tglx@...utronix.de, efault@....de
Subject: Re: [RFC PATCH 24/24] sched/time: Introduce CLOCK_THREAD_DVFS_ID

Hi Peter,

On 27/07/24 12:27, Peter Zijlstra wrote:
> In order to measure thread time in a DVFS world, introduce
> CLOCK_THREAD_DVFS_ID -- a copy of CLOCK_THREAD_CPUTIME_ID that slows
> down with both DVFS scaling and CPU capacity.
> 
> The clock does *NOT* support setting timers.
> 
> Useful for both SCHED_DEADLINE and the newly introduced
> sched_attr::sched_runtime usage for SCHED_NORMAL.

Just so I'm sure I understand, this would be useful for estimating the
runtime needs of a (also DEADLINE) task when DVFS is enabled, right?

Thanks,
Juri