linux-kernel - Re: [PATCH v8 6/7] cgroup/cpuset: Fail if isolated and nohz

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Message-ID: <aIIuostDifK5ympc@localhost.localdomain>
Date: Thu, 24 Jul 2025 15:01:22 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: Gabriele Monaco <gmonaco@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v8 6/7] cgroup/cpuset: Fail if isolated and nohz_full
 don't leave any housekeeping

Le Mon, Jul 14, 2025 at 03:30:57PM +0200, Gabriele Monaco a écrit :
> Currently the user can set up isolated cpus via cpuset and nohz_full in
> such a way that leaves no housekeeping CPU (i.e. no CPU that is neither
> domain isolated nor nohz full). This can be a problem for other
> subsystems (e.g. the timer wheel imgration).
> 
> Prevent this configuration by blocking any assignation that would cause
> the union of domain isolated cpus and nohz_full to covers all CPUs.
> 
> Signed-off-by: Gabriele Monaco <gmonaco@...hat.com>

Acked-by: Frederic Weisbecker <frederic@...nel.org>

-- 
Frederic Weisbecker
SUSE Labs