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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 27/33] kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management Date: Wed, 24 Dec 2025 14:45:14 +0100 Message-ID: <20251224134520.33231-28-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: E3F36180006 X-Rspamd-Server: rspam04 X-Stat-Signature: gno8xynmnkgjh6sfxy5infbbi7t6oht7 X-HE-Tag: 1766584163-395656 X-HE-Meta: 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 3ZkbpG/U FUF/1MP2TuzJtSnmoTBH3c/1cNX5iQNGQ3nEyKaeSz/shU3H6E8NrqJLrNWJQ63DPZzH+CHRt11ZSj3jpt90Y9Z4f9EVYJ51C+sNene6ljnW7xr51Ug81WSL2PSy/sJnW6gK4RqoUaEcUKQcS+cGQkFLqHp9bbbf/ugZ58M9LRlwju0YiLRUmpDLiE+ClAyViy+7Bf4OdOB5rkej+HmsMmlc3UdV0FRi64ugi233kfa3nmdQt9HUr4txZK7lfz1YTo+PnpsTfPzkeax/rupqDIHB81bGpLrVgjwTP 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 85ccf5bb17c9..968fa5868d21 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) -- 2.51.1