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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 24/33] kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management Date: Mon, 13 Oct 2025 22:31:37 +0200 Message-ID: <20251013203146.10162-25-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: dtoutaikxyqcb1ixuhuj4it9b4uewss9 X-Rspamd-Queue-Id: 3C93240008 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1760387705-784796 X-HE-Meta: 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 V9tWd4Li 2IdcAKo2+Ih4uS7qdm8yRHmgDyYYSxIBd1C2xxjl6T7mvsEZx8NVtYRasgofnWylqvrpdPmu/VQW+3RjRKDB/aw0sT9yRpn6O7drN2H+wbH3IybGqStydJNkq2qKrXOLCUFrQ8DPQTh8gZjPG82BlPYA2WIhVegnKO4N0Q0jYO4Zn+GgH4AGocj9cq6ktnarWhh733KcKCAmtQdPReZ4xkIUUYyjKDeo7SgeO851SD3lEEtuZdy6rpf+HacIVeJFVjwafbhN+mk40vUznGPuHwFbsAg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Unbound kthreads want to run neither on nohz_full CPUs nor on domain isolated CPUs. And since nohz_full implies domain isolation, checking the latter is enough to verify both. Therefore exclude kthreads from domain isolation. Signed-off-by: Frederic Weisbecker --- kernel/kthread.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/kernel/kthread.c b/kernel/kthread.c index cb0be05d6091..8d0c8c4c7e46 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -362,18 +362,20 @@ static void kthread_fetch_affinity(struct kthread *kthread, struct cpumask *cpum { const struct cpumask *pref; + guard(rcu)(); + if (kthread->preferred_affinity) { pref = kthread->preferred_affinity; } else { if (kthread->node == NUMA_NO_NODE) - pref = housekeeping_cpumask(HK_TYPE_KTHREAD); + pref = housekeeping_cpumask(HK_TYPE_DOMAIN); else pref = cpumask_of_node(kthread->node); } - cpumask_and(cpumask, pref, housekeeping_cpumask(HK_TYPE_KTHREAD)); + cpumask_and(cpumask, pref, housekeeping_cpumask(HK_TYPE_DOMAIN)); if (cpumask_empty(cpumask)) - cpumask_copy(cpumask, housekeeping_cpumask(HK_TYPE_KTHREAD)); + cpumask_copy(cpumask, housekeeping_cpumask(HK_TYPE_DOMAIN)); } static void kthread_affine_node(void) -- 2.51.0