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 6E7ECCCFA1B for ; Wed, 5 Nov 2025 21:07:20 +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=oF7ozQRct3Nq0s64sNrymtQh/CRoO7RSd6PJ/aLRJds=; b=3kN/yk6j1pW6n6jWX8rSOZC8Wh HlxcPgR/iX1ZMeZNFwBAEWNeLoYAO6sEVwmL8hNf8m/6MdrJKPW3ZB6Cuyjw+0luUFdLw65tINEUm qRXcS8ngENSa5uXle939QINqGafd05qpLI3mgZzXHkZDa/4USK5+LkV1CUuum3kKuPXwZrL0zmSRm 9kSE1viH9XWCG/iaZ1BoGpHUY0N4DeLhBTz3gTFenmgWGR5STixx0OrSPu8kIB5WDpsAkCIY4DK2L kHBjlldzC56JIy18oXWgQ7KaLesr8WIdWUzqHtmCGZvpjs3TeYAUBM7q0Dppx27TQTNvxA8yhPRLb w7x5GrAQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGkio-0000000ERnr-0Ezu; Wed, 05 Nov 2025 21:07:14 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGkim-0000000ERn2-4Aea for linux-arm-kernel@lists.infradead.org; Wed, 05 Nov 2025 21:07:13 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 60197601F1; Wed, 5 Nov 2025 21:07:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 81075C4CEF5; Wed, 5 Nov 2025 21:07:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762376832; bh=J6j4zsULKpjy2xGkRdPN0GqxRFQVWDdmCEJclS8fknA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=szIDSeRICvuPVa22uckyIj7tLtbwryeVGfvVRmV5zDtNt+6NVBCBqBwYblGbDqHv6 WQdkxwLPuV6izEzNadmWY/Cp9t5y4JB4wOFuPfAabLsKAgXFvGeFbrrhzqeNduk8ES yUOiqND2LZGDY74RENtGR/Bq7PP6DayV2rI64BjaalSyI4LE4lkSiJrfizlKFn1Emx uvFPUHCmqtSHSOY5v+/BkFDW/Z0kokfN1Y/al6wn7QE3P1GrD20T3kbhNhdCZ3GLRg rZ7BiZ/qbZ2XKuvtAYnPwl0IiJ1OfTlvfENurtuaeb+8HQO0rRM7YpPG6V6BEzxd/v N3mdEa+6d4mDw== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , 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 24/31] kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management Date: Wed, 5 Nov 2025 22:03:40 +0100 Message-ID: <20251105210348.35256-25-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251105210348.35256-1-frederic@kernel.org> References: <20251105210348.35256-1-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 86abfbc21bb0..69d70baceba2 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