linux-kernel - Re: [PATCH V7 9/9] sched/rt: Remove default bandwidth control

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Message-ID: <Z02AQe4iUsOTYa-4@jlelli-thinkpadt14gen4.remote.csb>
Date: Mon, 2 Dec 2024 10:39:13 +0100
From: Juri Lelli <juri.lelli@...hat.com>
To: Michal Koutný <mkoutny@...e.com>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org,
	Luca Abeni <luca.abeni@...tannapisa.it>,
	Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	Joel Fernandes <joel@...lfernandes.org>,
	Vineeth Pillai <vineeth@...byteword.org>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Phil Auld <pauld@...hat.com>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH V7 9/9] sched/rt: Remove default bandwidth control

On 29/11/24 21:21, Michal Koutný wrote:
> On Fri, Nov 29, 2024 at 03:44:53PM GMT, Juri Lelli <juri.lelli@...hat.com> wrote:
> > You can disable admission control by echoing -1 in sched_rt_runtime_us,
> > but still have the dl_server working for SCHED_NORMAL tasks. By
> > disabling admission control SCHED_DEADLINE can indeed monopolize CPU
> > (over subscription).
> 
> | I'm wondering if different values of Δ mean anything or how they can
> | be used.
> 
> Aha, the knob therefore remains relevant for the DL admission control.
> 
> So if I put it together, I will write it down like this:

Ah, yes sounds good to me, thanks for writing it down properly! :)

If you send it out as a separate patch, please feel free to add

Acked-by: Juri Lelli <juri.lelli@...hat.com>

Best,
Juri