linux-kernel - Re: [PATCH] sched/core: Report failed rt migrations to non-root cgroup without rt bandwidth under RT_GROUP

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Message-ID: <w5z36gxgncmsoojht2upexrar7ooybaalg6s3gu4dugmnhvf2k@lqvh7feslsou>
Date: Fri, 19 Sep 2025 18:24:29 -0400
From: Aaron Tomlin <atomlin@...mlin.com>
To: Michal Koutný <mkoutny@...e.com>
Cc: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, 
	vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org, 
	bsegall@...gle.com, mgorman@...e.de, vschneid@...hat.com, 
	shashank.mahadasyam@...y.com, longman@...hat.com, tj@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/core: Report failed rt migrations to non-root
 cgroup without rt bandwidth under RT_GROUP_SCHED

On Wed, Sep 17, 2025 at 11:37:37AM +0200, Michal Koutný wrote:
> So I'd primarily suggest you to disable CONFIG_RT_GROUP_SCHED. It seems
> you ran into a situation where you have kernel with
> CONFIG_RT_GROUP_SCHED but userspace that'd like to use cgroup v2 and
> these two are known not get well along. (Alternatively, you may switch
> userspace to v1 if you really really need RT groups.)

Thanks Michal! I initially thought you were suggesting to "normalize" the
RT task in this context (e.g. a simplified version of
__sched_setscheduler()) to allow forward progress so the CPU controller can
be attached. Please ignore.


Kind regards,
-- 
Aaron Tomlin