From nobody Tue Feb 10 08:27:35 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id AD1B614AD12 for ; Wed, 3 Apr 2024 15:06:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712156812; cv=none; b=awX1nzxY90tSVmSzEu2ur8h3sra5G81SVfnzmPf9gxo4VDD1Kr9B/Yc/uEIEzFKkTNjiSL/5eSTLpoeitBiRasVq+hA6lMeUS20wUmYTvRTxIA3KE3/e++iqieSKIlarIfV4b0rg8j8+vgzeZuODM4ouiUNXe0x/uYnkqIPzZtE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712156812; c=relaxed/simple; bh=KP3KQkWwmKSjgJr+k2KTuvgcjSIjuAYMNmf/QgiXrPU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=brImyySHLoX3Qp84yqT5kfX/wFTsTtxdIXCGwcXnISxRIKiSX48TZ8e1jDBujL5iznENCSZcP7T4CZrsdivkNPTlIVHl0b6WNV7yyrLdlP0HcgehkoAcQsMr4hPkYby7Ynj0/19DmtOwQMvdJyPNei3lH//FlSxgwCJA89Tc6V4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5301F168F; Wed, 3 Apr 2024 08:07:21 -0700 (PDT) Received: from e126645.arm.com (unknown [10.57.74.15]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B37DA3F7B4; Wed, 3 Apr 2024 08:06:45 -0700 (PDT) From: Pierre Gondois To: linux-kernel@vger.kernel.org Cc: Aaron Lu , Rui Zhang , Pierre Gondois , Anna-Maria Behnsen , Frederic Weisbecker , Ingo Molnar , Thomas Gleixner , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Tejun Heo , Michal Hocko , Andrew Morton , Waiman Long Subject: [PATCH 5/7] sched/topology: Remove CPUs with NULL sd from HKR_TYPE_SCHED mask Date: Wed, 3 Apr 2024 17:05:37 +0200 Message-Id: <20240403150543.2793354-6-pierre.gondois@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240403150543.2793354-1-pierre.gondois@arm.com> References: <20240403150543.2793354-1-pierre.gondois@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Upon attaching a NULL sched domain to a CPU, remove the CPU from the HKR_TYPE_SCHED isolation mask. CPUs present in this mask are prevented from being added to the fair.c variables: - nohz.idle_cpus_mask - nohz.nr_cpus Signed-off-by: Pierre Gondois --- kernel/sched/topology.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 63aecd2a7a9f..b4fc212ccfb0 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -775,6 +775,11 @@ cpu_attach_domain(struct sched_domain *sd, struct root= _domain *rd, int cpu) =20 sched_domain_debug(sd, cpu); =20 + if (sd) + housekeeping_runtime_set_cpu(cpu, HKR_TYPE_SCHED); + else + housekeeping_runtime_clear_cpu(cpu, HKR_TYPE_SCHED); + rq_attach_root(rq, rd); tmp =3D rq->sd; rcu_assign_pointer(rq->sd, sd); --=20 2.25.1