linux-kernel - Re: [RFC PATCH 0/9] Add kernel cmdline option for rt_group

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Message-ID: <4eqnoqtpk2gbrr3cgukm672eljyrl7us5ozuy5q5ib2ln7itzf@bg3kt473ly2l>
Date: Fri, 10 Jan 2025 11:04:52 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>, 
	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>, Frederic Weisbecker <fweisbecker@...e.com>
Subject: Re: [RFC PATCH 0/9] Add kernel cmdline option for rt_group_sched

On Tue, Jan 07, 2025 at 08:41:06PM +0100, Peter Zijlstra <peterz@...radead.org> wrote:
> We all hate this thing and want it to go away. So not being able to use
> it is a pro from where I'm at.

I understand and to some extent am not a fan of it neither (we had
disabled it in SUSE quite some time ago). I'd consider the remaining
existing users legacy.

> Sadly the replacement isn't there yet either, which makes it all really
> difficult.

Exactly. Thus the runtime switch is meant as a bridge for general
purpose distros where a kernel is shipped pre-configured (i.e. one
config where the default is non-grouped not to hinder the majority use
cases).

Considering the legacy usecases on distribution kernels do you oppose
the chosen approach? I can work on changes if you have comments on the
implementation itself.

Thanks,
Michal

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