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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: Sun, 25 Jan 2026 23:45:34 +0100 Message-ID: <20260125224541.50226-28-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260125224541.50226-1-frederic@kernel.org> References: <20260125224541.50226-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: B3235A0003 X-Stat-Signature: c8pro3feqcc9uw4kdox1yxzq5wcins86 X-HE-Tag: 1769381372-460701 X-HE-Meta: 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 gsKzmlpJ XTynOvVQo3ViD6WzXH5fuudQNIz6hoFLg+le4BlnU1zlc5uVSMv0D234v8fRftvirEOAZn2GblDxSdbslR/QM2AaUZ+BgbM9aUo3t9N0/L+df2SKEmxRaJ5cll43TPgrpBO0w/22EwLOAQoKrfsD/0z5njQCyfBJaa0u6B4h247d3G91qJqV3qSw+WkqXXZCGIDN4XAoyF1mn4DqqFxN56K+gUjBppsAMkRHJDFQ2UhOryLnQA0MILS4UZSZ3v+2b4h7QaVgZioAbaEDfdT9/4dS5MJwJb+5kJQUYFMoKPmg6axi7pyeEcxJ7cA== 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 Reviewed-by: Waiman Long --- 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