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[23.128.96.18]) by mx.google.com with ESMTP id by8si10235838edb.354.2020.06.16.05.26.37; Tue, 16 Jun 2020 05:26:59 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729333AbgFPMXt (ORCPT + 99 others); Tue, 16 Jun 2020 08:23:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728882AbgFPMWC (ORCPT ); Tue, 16 Jun 2020 08:22:02 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61850C08C5C4; Tue, 16 Jun 2020 05:22:01 -0700 (PDT) Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jlAbF-0004gO-BB; Tue, 16 Jun 2020 14:21:57 +0200 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id 995791C0833; Tue, 16 Jun 2020 14:21:52 +0200 (CEST) Date: Tue, 16 Jun 2020 12:21:52 -0000 From: "tip-bot2 for Dietmar Eggemann" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/core] sched/deadline: Optimize dl_bw_cpus() Cc: Dietmar Eggemann , "Peter Zijlstra (Intel)" , Juri Lelli , x86 , LKML In-Reply-To: <20200520134243.19352-2-dietmar.eggemann@arm.com> References: <20200520134243.19352-2-dietmar.eggemann@arm.com> MIME-Version: 1.0 Message-ID: <159231011243.16989.7064939919417124511.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the sched/core branch of tip: Commit-ID: c81b89329933c6c0be809d4c0d2cb57c49153ee3 Gitweb: https://git.kernel.org/tip/c81b89329933c6c0be809d4c0d2cb57c49153ee3 Author: Dietmar Eggemann AuthorDate: Wed, 20 May 2020 15:42:39 +02:00 Committer: Peter Zijlstra CommitterDate: Mon, 15 Jun 2020 14:10:04 +02:00 sched/deadline: Optimize dl_bw_cpus() Return the weight of the root domain (rd) span in case it is a subset of the cpu_active_mask. Continue to compute the number of CPUs over rd span and cpu_active_mask when in hotplug. Signed-off-by: Dietmar Eggemann Signed-off-by: Peter Zijlstra (Intel) Acked-by: Juri Lelli Link: https://lkml.kernel.org/r/20200520134243.19352-2-dietmar.eggemann@arm.com --- kernel/sched/deadline.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index f31964a..ec90265 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -54,10 +54,16 @@ static inline struct dl_bw *dl_bw_of(int i) static inline int dl_bw_cpus(int i) { struct root_domain *rd = cpu_rq(i)->rd; - int cpus = 0; + int cpus; RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(), "sched RCU must be held"); + + if (cpumask_subset(rd->span, cpu_active_mask)) + return cpumask_weight(rd->span); + + cpus = 0; + for_each_cpu_and(i, rd->span, cpu_active_mask) cpus++;