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: <6zi6fp2kgs2hjychav3rrf22qwwskegdq53ew33tfn7rylueik@slugq2khaakw>
Date: Tue, 16 Sep 2025 11:09:45 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Aaron Tomlin <atomlin@...mlin.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 Mon, Sep 15, 2025 at 09:11:46PM -0400, Aaron Tomlin <atomlin@...mlin.com> wrote:
> Following on from commit c7461cca91 ("cgroup, docs: Be explicit about
> independence of RT_GROUP_SCHED and non-cpu controllers"), this patch
> introduces an explicit error message that informs the user why the
> task migration failed. Now user-mode has a clear and actionable reason
> for the failure, greatly assisting with debugging.

The action in this case should be to assign non-trivial quota to target
task_group (or un-rt the task), no?

What setup do you envision for this message? (CONFIG_RT_GROUP_SCHED and
cgroup v2?)

Thanks,
Michal

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