linux-kernel - Re: [PATCH v2 06/10] sched: Bypass bandwitdh checks with runtime disabled RT_GROUP

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Message-ID: <nt6pfc3lwud2k3eakjr7qutseuhtislao4jr43a5355tjqnbnb@6deb5jxmwadr>
Date: Thu, 3 Apr 2025 14:20:59 +0200
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: [PATCH v2 06/10] sched: Bypass bandwitdh checks with runtime
 disabled RT_GROUP_SCHED

On Wed, Apr 02, 2025 at 02:02:21PM +0200, Peter Zijlstra <peterz@...radead.org> wrote:
> Can we make it so that cgroup-v2 is explicitly disallowed for now? As I
> said earlier, we're looking at a new implemention with a incompatible
> interface.

I meant here that
- rt_group_sched=0 -> cgroup v2 works but there's no RT group scheduling
- rt_group_sched=1 -> cgroup v2 doesn't work (prohibit RT tasks in
                      non-root groups)

I.e. there is no new function for cgroup v2 besides that it is possible
to switch to RT group scheduling (with v1) without recompiling the
kernel.

Michal

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