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Date: Tue, 12 May 2026 08:20:50 -1000
From: Tejun Heo <tj@kernel.org>
To: Yuri Andriaccio <yuri.andriaccio@santannapisa.it>
Cc: luca abeni <luca.abeni@santannapisa.it>,
	Peter Zijlstra <peterz@infradead.org>,
	Yuri Andriaccio <yurand2000@gmail.com>,
	Ingo Molnar <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	Valentin Schneider <vschneid@redhat.com>,
	linux-kernel@vger.kernel.org, hannes@cmpxchg.org, mkoutny@suse.com,
	cgroups@vger.kernel.org
Subject: Re: [RFC PATCH v5 20/29] sched/deadline: Allow deeper hierarchies of
 RT cgroups
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On Tue, May 12, 2026 at 08:19:02AM -1000, Tejun Heo wrote:
> How is a delegated subtree prevented from setting cpu.rt.min = 'root' and
> escaping its ancestors' cpu.rt.max budget?

Hmm.. I guess the same problem exists w/ separate rt controller too. If the
users on the system already started using rt, how do you enable the
controller from the top down with budgets already being used down in the
hierarchy?

Thanks.

-- 
tejun