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 X-Spam-Level: X-Spam-Status: No, score=-12.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8113EC43381 for ; Sat, 9 Mar 2019 14:38:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4FBB5207E0 for ; Sat, 9 Mar 2019 14:38:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726590AbfCIOid (ORCPT ); Sat, 9 Mar 2019 09:38:33 -0500 Received: from terminus.zytor.com ([198.137.202.136]:56947 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726294AbfCIOid (ORCPT ); Sat, 9 Mar 2019 09:38:33 -0500 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id x29EcEGR3109009 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Sat, 9 Mar 2019 06:38:15 -0800 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id x29EcCfp3109006; Sat, 9 Mar 2019 06:38:12 -0800 Date: Sat, 9 Mar 2019 06:38:12 -0800 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Valentin Schneider Message-ID: Cc: peterz@infradead.org, morten.rasmussen@arm.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@kernel.org, bp@alien8.de, riel@surriel.com, torvalds@linux-foundation.org, dave.hansen@linux.intel.com, luto@kernel.org, valentin.schneider@arm.com, tglx@linutronix.de Reply-To: morten.rasmussen@arm.com, peterz@infradead.org, linux-kernel@vger.kernel.org, hpa@zytor.com, bp@alien8.de, mingo@kernel.org, riel@surriel.com, torvalds@linux-foundation.org, dave.hansen@linux.intel.com, luto@kernel.org, tglx@linutronix.de, valentin.schneider@arm.com In-Reply-To: <20190211175946.4961-4-valentin.schneider@arm.com> References: <20190211175946.4961-4-valentin.schneider@arm.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/urgent] sched/fair: Skip LLC NOHZ logic for asymmetric systems Git-Commit-ID: ce28d2e53cda890771360d32259495dd6a9c4253 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: ce28d2e53cda890771360d32259495dd6a9c4253 Gitweb: https://git.kernel.org/tip/ce28d2e53cda890771360d32259495dd6a9c4253 Author: Valentin Schneider AuthorDate: Mon, 11 Feb 2019 17:59:46 +0000 Committer: Ingo Molnar CommitDate: Sat, 9 Mar 2019 14:03:53 +0100 sched/fair: Skip LLC NOHZ logic for asymmetric systems The LLC NOHZ condition will become true as soon as >=2 CPUs in a single LLC domain are busy. On big.LITTLE systems, this translates to two or more CPUs of a "cluster" (big or LITTLE) being busy. Issuing a NOHZ kick in these conditions isn't desired for asymmetric systems, as if the busy CPUs can provide enough compute capacity to the running tasks, then we can leave the NOHZ CPUs in peace. Skip the LLC NOHZ condition for asymmetric systems, and rely on nr_running & capacity checks to trigger NOHZ kicks when the system actually needs them. Suggested-by: Morten Rasmussen Signed-off-by: Valentin Schneider Signed-off-by: Peter Zijlstra (Intel) Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: Dietmar.Eggemann@arm.com Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Cc: vincent.guittot@linaro.org Link: https://lkml.kernel.org/r/20190211175946.4961-4-valentin.schneider@arm.com Signed-off-by: Ingo Molnar --- kernel/sched/fair.c | 65 ++++++++++++++++++++++++++++++----------------------- 1 file changed, 37 insertions(+), 28 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f0d2f8a352bf..51003e1c794d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -9603,24 +9603,6 @@ static void nohz_balancer_kick(struct rq *rq) } rcu_read_lock(); - sds = rcu_dereference(per_cpu(sd_llc_shared, cpu)); - if (sds) { - /* - * If there is an imbalance between LLC domains (IOW we could - * increase the overall cache use), we need some less-loaded LLC - * domain to pull some load. Likewise, we may need to spread - * load within the current LLC domain (e.g. packed SMT cores but - * other CPUs are idle). We can't really know from here how busy - * the others are - so just get a nohz balance going if it looks - * like this LLC domain has tasks we could move. - */ - nr_busy = atomic_read(&sds->nr_busy_cpus); - if (nr_busy > 1) { - flags = NOHZ_KICK_MASK; - goto unlock; - } - - } sd = rcu_dereference(rq->sd); if (sd) { @@ -9635,6 +9617,21 @@ static void nohz_balancer_kick(struct rq *rq) } } + sd = rcu_dereference(per_cpu(sd_asym_packing, cpu)); + if (sd) { + /* + * When ASYM_PACKING; see if there's a more preferred CPU + * currently idle; in which case, kick the ILB to move tasks + * around. + */ + for_each_cpu_and(i, sched_domain_span(sd), nohz.idle_cpus_mask) { + if (sched_asym_prefer(i, cpu)) { + flags = NOHZ_KICK_MASK; + goto unlock; + } + } + } + sd = rcu_dereference(per_cpu(sd_asym_cpucapacity, cpu)); if (sd) { /* @@ -9645,20 +9642,32 @@ static void nohz_balancer_kick(struct rq *rq) flags = NOHZ_KICK_MASK; goto unlock; } + + /* + * For asymmetric systems, we do not want to nicely balance + * cache use, instead we want to embrace asymmetry and only + * ensure tasks have enough CPU capacity. + * + * Skip the LLC logic because it's not relevant in that case. + */ + goto unlock; } - sd = rcu_dereference(per_cpu(sd_asym_packing, cpu)); - if (sd) { + sds = rcu_dereference(per_cpu(sd_llc_shared, cpu)); + if (sds) { /* - * When ASYM_PACKING; see if there's a more preferred CPU - * currently idle; in which case, kick the ILB to move tasks - * around. + * If there is an imbalance between LLC domains (IOW we could + * increase the overall cache use), we need some less-loaded LLC + * domain to pull some load. Likewise, we may need to spread + * load within the current LLC domain (e.g. packed SMT cores but + * other CPUs are idle). We can't really know from here how busy + * the others are - so just get a nohz balance going if it looks + * like this LLC domain has tasks we could move. */ - for_each_cpu_and(i, sched_domain_span(sd), nohz.idle_cpus_mask) { - if (sched_asym_prefer(i, cpu)) { - flags = NOHZ_KICK_MASK; - goto unlock; - } + nr_busy = atomic_read(&sds->nr_busy_cpus); + if (nr_busy > 1) { + flags = NOHZ_KICK_MASK; + goto unlock; } } unlock: