From: Frederic Weisbecker <frederic@kernel.org>
To: Gabriele Monaco <gmonaco@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Anna-Maria Behnsen <anna-maria@linutronix.de>,
Thomas Gleixner <tglx@linutronix.de>,
Waiman Long <longman@redhat.com>
Subject: Re: [PATCH v7 5/7] sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any
Date: Mon, 7 Jul 2025 13:28:34 +0200 [thread overview]
Message-ID: <aGuvYlexf7wZxUG3@localhost.localdomain> (raw)
In-Reply-To: <20250626114900.106061-6-gmonaco@redhat.com>
Le Thu, Jun 26, 2025 at 01:48:58PM +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 and nohz_full covers all CPUs.
>
> Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
--
Frederic Weisbecker
SUSE Labs
next prev parent reply other threads:[~2025-07-07 11:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-26 11:48 [PATCH v7 0/7] timers: Exclude isolated cpus from timer migration Gabriele Monaco
2025-06-26 11:48 ` [PATCH v7 1/7] timers: Rename tmigr 'online' bit to 'available' Gabriele Monaco
2025-07-07 10:12 ` Frederic Weisbecker
2025-06-26 11:48 ` [PATCH v7 2/7] timers: Add the available mask in timer migration Gabriele Monaco
2025-07-07 11:11 ` Frederic Weisbecker
2025-06-26 11:48 ` [PATCH v7 3/7] timers: Use scoped_guard when setting/clearing the tmigr available flag Gabriele Monaco
2025-06-26 11:48 ` [PATCH v7 4/7] cgroup/cpuset: Rename update_unbound_workqueue_cpumask() to update_exclusion_cpumasks() Gabriele Monaco
2025-06-26 11:48 ` [PATCH v7 5/7] sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any Gabriele Monaco
2025-07-07 11:28 ` Frederic Weisbecker [this message]
2025-06-26 11:48 ` [PATCH v7 6/7] cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping Gabriele Monaco
2025-06-26 11:49 ` [PATCH v7 7/7] timers: Exclude isolated cpus from timer migration Gabriele Monaco
2025-07-07 13:11 ` Frederic Weisbecker
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