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 v8 6/7] cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping
Date: Thu, 24 Jul 2025 15:01:22 +0200 [thread overview]
Message-ID: <aIIuostDifK5ympc@localhost.localdomain> (raw)
In-Reply-To: <20250714133050.193108-15-gmonaco@redhat.com>
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@redhat.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
--
Frederic Weisbecker
SUSE Labs
next prev parent reply other threads:[~2025-07-24 13:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-14 13:30 [PATCH v8 0/7] timers: Exclude isolated cpus from timer migration Gabriele Monaco
2025-07-14 13:30 ` [PATCH v8 1/7] timers: Rename tmigr 'online' bit to 'available' Gabriele Monaco
2025-07-14 13:30 ` [PATCH v8 2/7] timers: Add the available mask in timer migration Gabriele Monaco
2025-07-24 10:20 ` Frederic Weisbecker
2025-07-14 13:30 ` [PATCH v8 3/7] timers: Use scoped_guard when setting/clearing the tmigr available flag Gabriele Monaco
2025-07-24 10:29 ` Frederic Weisbecker
2025-07-14 13:30 ` [PATCH v8 4/7] cgroup/cpuset: Rename update_unbound_workqueue_cpumask() to update_exclusion_cpumasks() Gabriele Monaco
2025-07-24 10:33 ` Frederic Weisbecker
2025-07-14 13:30 ` [PATCH v8 5/7] sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any Gabriele Monaco
2025-07-14 13:30 ` [PATCH v8 6/7] cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping Gabriele Monaco
2025-07-24 13:01 ` Frederic Weisbecker [this message]
2025-07-14 13:30 ` [PATCH v8 7/7] timers: Exclude isolated cpus from timer migration Gabriele Monaco
2025-07-24 23:05 ` Frederic Weisbecker
2025-07-25 6:42 ` Gabriele Monaco
2025-07-25 10:55 ` Frederic Weisbecker
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