linux-kernel - Re: [PATCH v11 6/8] sched/isolation: Force housekeeping if isolcpus and nohz

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Message-ID: <aLbg1_DpQNUjsc2P@localhost.localdomain>
Date: Tue, 2 Sep 2025 14:19:35 +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 v11 6/8] sched/isolation: Force housekeeping if isolcpus
 and nohz_full don't leave any

Le Fri, Aug 08, 2025 at 06:01:40PM +0200, Gabriele Monaco a écrit :
> Currently the user can set up isolcpus 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 invalidating the last setting in case the
> union of isolcpus (domain) and nohz_full covers all CPUs.
> 
> Signed-off-by: Gabriele Monaco <gmonaco@...hat.com>

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

-- 
Frederic Weisbecker
SUSE Labs