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 v11 6/8] sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any
Date: Tue, 2 Sep 2025 14:19:35 +0200 [thread overview]
Message-ID: <aLbg1_DpQNUjsc2P@localhost.localdomain> (raw)
In-Reply-To: <20250808160142.103852-7-gmonaco@redhat.com>
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@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
--
Frederic Weisbecker
SUSE Labs
next prev parent reply other threads:[~2025-09-02 12:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-08 16:01 [PATCH v11 0/8] timers: Exclude isolated cpus from timer migration Gabriele Monaco
2025-08-08 16:01 ` [PATCH v11 1/8] timers/migration: Postpone online/offline callbacks registration to late initcall Gabriele Monaco
2025-08-08 16:01 ` [PATCH v11 2/8] timers: Rename tmigr 'online' bit to 'available' Gabriele Monaco
2025-08-08 16:01 ` [PATCH v11 3/8] timers: Add the available mask in timer migration Gabriele Monaco
2025-08-08 16:01 ` [PATCH v11 4/8] timers: Use scoped_guard when setting/clearing the tmigr available flag Gabriele Monaco
2025-08-08 16:01 ` [PATCH v11 5/8] cgroup/cpuset: Rename update_unbound_workqueue_cpumask() to update_exclusion_cpumasks() Gabriele Monaco
2025-08-08 16:01 ` [PATCH v11 6/8] sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any Gabriele Monaco
2025-08-12 15:29 ` Waiman Long
2025-09-02 12:19 ` Frederic Weisbecker [this message]
2025-08-08 16:01 ` [PATCH v11 7/8] cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping Gabriele Monaco
2025-08-12 15:40 ` Waiman Long
2025-08-12 16:41 ` Waiman Long
2025-08-08 16:01 ` [PATCH v11 8/8] timers: Exclude isolated cpus from timer migration Gabriele Monaco
2025-08-12 17:20 ` Waiman Long
2025-08-13 15:20 ` Gabriele Monaco
2025-09-01 12:41 ` Frederic Weisbecker
2025-09-01 13:48 ` Gabriele Monaco
2025-09-01 21:11 ` Frederic Weisbecker
2025-09-02 11:08 ` Gabriele Monaco
2025-09-02 12:45 ` Frederic Weisbecker
2025-09-08 8:35 ` Gabriele Monaco
2025-08-27 19:52 ` [PATCH v11 0/8] " John B. Wyatt IV
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