From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2EDDDE75453 for ; Wed, 24 Dec 2025 13:49:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=vaBB3ZAidEzu+R4QKreMGrQqZKFKqkZxWTvMIWrUJi8=; b=c6cwPF7SrlIYKPDJFQIMxjgaBp 7YoqK1frvuLEiRHMYC/XEt6ah8flpCEN5BJUz97OBpxROjd76wqy37ILTjIg9swq5VnY3zl3ZEwdc sWRIUZv2iZnJLXhUcSXwVhqu2Ryw09YzQPJYlIcehpSein0SmlVGBxLnroX8/Nl6xpgtuYTkKX6c5 JgH0ZEFyUF7YqgFaZQbApMj5bDsN3GRkcFGRCNVYTkg3sc5xukIihfGeNeuIqOpdM6mLlzFY/2Pit OR9qcAdgd8z+jT12nHxbFfwrmWa1LqVZ62yZ2pmbwmCGA4rgdXQCn1zrXD7v0bpIafHLcMgKPlEaY M6CpZqCA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vYPF1-0000000Gu0m-0ewO; Wed, 24 Dec 2025 13:49:27 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vYPEx-0000000Gtvx-3ikB for linux-arm-kernel@lists.infradead.org; Wed, 24 Dec 2025 13:49:24 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 53B20600AD; Wed, 24 Dec 2025 13:49:23 +0000 (UTC) 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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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