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 31C27CCD185 for ; Mon, 13 Oct 2025 20:35:12 +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=bcejJ+qERsCbxE1HeS/D/TrEhbhgOItY0Tp2plYf2OY=; b=kS4C1c1S559qGnuzWvfyfKOM7G bMLaIuXiwN33vupeKs/7aYI/KdMquER31csAfFU5gIYdY0PR9vNYqEyBO8Wqq2du3TynvIscUshAd /Brn+sAVobNX1AU+drKpocNaUawj0lCXSm7QSi5mCswnyZYt3MBiK6EQOS0NzLHaj+/lt701m+Zv+ CSjORv47D9a8buCukBsO6EnmY5jYm306HCkBTXuLUqm68O2+7gggjuXcFsTnUgsfmM+8cOUzLRC8R 689gXt2hi4rvRkhV717Fok8ucv8HKfy6DrqtnsCDDyBXAEVLkW9t/1K4piERGrmNruAW9qJVHn4WX nC1oo6jA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8PG6-0000000EPPb-0Lhn; Mon, 13 Oct 2025 20:35:06 +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 1v8PG5-0000000EPNm-0G88 for linux-arm-kernel@lists.infradead.org; Mon, 13 Oct 2025 20:35:05 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 6B78761DF0; Mon, 13 Oct 2025 20:35:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65864C4CEF8; Mon, 13 Oct 2025 20:34:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760387704; bh=P4mvTUeHXF9en4Wc01ryvy7Y+w+A6mZbhGMT9VJdNo8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uAo47q15gD48C7SdcvHUfVvWDlDNeHp2TLA9efNKkx7V7ATILjsd2QTj9semDC601 E0m4Mor4NEQdRAkmFJL7MMtE0xIfVWxG6guaxtc0wUtXl+H0gdbn+Q1vFfelndq3ij WyaCD8JOsDpeutJtmpNdXO0dyEEsHZsKQwjuuJpWFac8CBuzwGgmEiLgWHxPGjhYX2 v8ObSANlzhTMQSmtojBwEeTfglLwbivxWI+gBQWVTi7c9knWojTx+IMOqbWrFgCq70 XPMjCM7kaEn1TC/GQUIqhnBgsNJiFMJ6YnirbKuYhz+1cFUe8LfbO5qXhS0SwY1E+1 o/Pza/73NnM0A== 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 24/33] kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management Date: Mon, 13 Oct 2025 22:31:37 +0200 Message-ID: <20251013203146.10162-25-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-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 cb0be05d6091..8d0c8c4c7e46 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