From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 879C13570AF; Wed, 24 Dec 2025 13:49:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766584163; cv=none; b=JY0uD07NamNBPdqLzc4b82o2gMdsl0T2UPzbqt4Y5OhPXgb5lUkSFt5fAcuUPom4fKtcnqHvqb8BojjJh96z92AInoxZkoMobVvtiYuEssrIj1AP+xBdrbObTa2e2BEf2+pU1BsZeH7gmelx0I1GB9ScyM94RBIOeQo3lCeHWA0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766584163; c=relaxed/simple; bh=ENIdUvl8EYDtGu4SEnJQoOMyqCQID6RqOP4IIi52OKQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ctyXa1cF/cEo1U+39MNDPDEIwJmo6ZKZpzsgv8AKVRJp+b7S538C+J+mjUjWlJwJ8fR5VH1lpaS4oXlkZVVUK4uELXm7xVFKjJ9f3xxWLs0aVExDfK19VXlndxcX+F4otB0a9P6l+yTf3pOnx4zoeCF7v/LM4fRYXxZoqemMopo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=u5nMJGU7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="u5nMJGU7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D148C19422; Wed, 24 Dec 2025 13:49:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766584163; bh=ENIdUvl8EYDtGu4SEnJQoOMyqCQID6RqOP4IIi52OKQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u5nMJGU7u1DH0JY08fgyPGDPpgKN8a8XlXRA7QVvtQppd+ytoY69BFhVMltQ23cU/ EI69ztN/Eq+S6IUsh6uy3SbC1D07oMdavhWJN3/AiyBPCttozyUuh3XWjyMnS47FHW XHN9PS6WwvJhEjdb9GFI3YR1+11G/AF84ulnRcD1PerMS7JVK2t3NPmY5/1D5R6dYR m0FVn+H9Ta83gahzHDJQ9ONnH+JIdQJhkZbulzIouua4dDtOG7MgurzpZve+xNFkVR vc0MdghWXVXVHevpJ7RCMqOo2w7nBsjUk2lPDZYtG/HiEXu+SbNdzvxyX6MwRfR6Mz M/mKgvQ1Rf4Ug== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Chen Ridong , Danilo Krummrich , "David S . 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> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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