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 370FD3101B9; Mon, 13 Oct 2025 20:35:04 +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=1760387704; cv=none; b=U2HZ2GA8HQdRqwjZzvecv9bSrmM51xGwb9aBva+jfnPnPLq8Kzq0K2MJ301hYwnXRs8McOCiF539J8/TVDr95VTLKNZGX2khXsa29Yp6JjCbIcnsHmOiy8d/LtwKoao73zWFGerMLVU24/n/eUeY/posnkah/sRFEVPkalSpD60= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760387704; c=relaxed/simple; bh=P4mvTUeHXF9en4Wc01ryvy7Y+w+A6mZbhGMT9VJdNo8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mG/WuEMeoAMGLneR+IcTvACeVKK6gGWlJ6V2nOJU0qDb3Rfw9fz8jPfGqGWrpISWh5OA5nvXe4ub0TIjjA2xu+idaEL167fy7loNkn7uUNoB1ncyWdRtWvKYVQzoL3WzfyNzV+6yhVETnkI6lYD9OvkURpwYA9+Ab+siW3/1+LY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uAo47q15; 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="uAo47q15" 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> 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 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