linux-kernel - Re: [RFC PATCH v3 17/24] sched/rt: Remove support for cgroups-v1

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Message-ID: <aO-Kw2BQ24_Pp1Xf@jlelli-thinkpadt14gen4.remote.csb>
Date: Wed, 15 Oct 2025 13:51:31 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Yuri Andriaccio <yurand2000@...il.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>,
	Yuri Andriaccio <yuri.andriaccio@...tannapisa.it>
Subject: Re: [RFC PATCH v3 17/24] sched/rt: Remove support for cgroups-v1

Hello,

On 29/09/25 11:22, Yuri Andriaccio wrote:
> Disable control files for cgroups-v1, and allow only cgroups-v2. This should
> simplify maintaining the code, also because cgroups-v1 are deprecated.
> 
> Set the default rt-cgroups runtime to zero, otherwise a cgroup-v1 kernel will
> not be able to start SCHED_DEADLINE tasks. The bandwidth for rt-cgroups must
> then be manually assigned after the kernel boots.
> 
> Signed-off-by: Yuri Andriaccio <yurand2000@...il.com>
> ---

The change looks good, but I think this series is currently missing a
substantial Docs update. admin-guide cgroup section and scheduler needs
some changes, I believe. Please consider doing so for next revision.

Thanks,
Juri