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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 D5D6DC433E6 for ; Tue, 26 Jan 2021 05:31:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A18E22B37 for ; Tue, 26 Jan 2021 05:31:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727889AbhAZFb0 (ORCPT ); Tue, 26 Jan 2021 00:31:26 -0500 Received: from outbound-smtp49.blacknight.com ([46.22.136.233]:48943 "EHLO outbound-smtp49.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727499AbhAYKV6 (ORCPT ); Mon, 25 Jan 2021 05:21:58 -0500 Received: from mail.blacknight.com (pemlinmail01.blacknight.ie [81.17.254.10]) by outbound-smtp49.blacknight.com (Postfix) with ESMTPS id B858241C026 for ; Mon, 25 Jan 2021 08:59:10 +0000 (GMT) Received: (qmail 12105 invoked from network); 25 Jan 2021 08:59:10 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.22.4]) by 81.17.254.9 with ESMTPA; 25 Jan 2021 08:59:10 -0000 From: Mel Gorman To: Peter Zijlstra , Ingo Molnar Cc: Vincent Guittot , Li Aubrey , Qais Yousef , LKML , Mel Gorman Subject: [PATCH 2/4] sched/fair: Move avg_scan_cost calculations under SIS_PROP Date: Mon, 25 Jan 2021 08:59:07 +0000 Message-Id: <20210125085909.4600-3-mgorman@techsingularity.net> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210125085909.4600-1-mgorman@techsingularity.net> References: <20210125085909.4600-1-mgorman@techsingularity.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As noted by Vincent Guittot, avg_scan_costs are calculated for SIS_PROP even if SIS_PROP is disabled. Move the time calculations under a SIS_PROP check and while we are at it, exclude the cost of initialising the CPU mask from the average scan cost. Signed-off-by: Mel Gorman --- kernel/sched/fair.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9f5682aeda2e..c8d8e185cf3b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6153,6 +6153,8 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t if (!this_sd) return -1; + cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr); + if (sched_feat(SIS_PROP)) { u64 avg_cost, avg_idle, span_avg; @@ -6168,11 +6170,9 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t nr = div_u64(span_avg, avg_cost); else nr = 4; - } - - time = cpu_clock(this); - cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr); + time = cpu_clock(this); + } for_each_cpu_wrap(cpu, cpus, target) { if (!--nr) @@ -6181,8 +6181,10 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t break; } - time = cpu_clock(this) - time; - update_avg(&this_sd->avg_scan_cost, time); + if (sched_feat(SIS_PROP)) { + time = cpu_clock(this) - time; + update_avg(&this_sd->avg_scan_cost, time); + } return cpu; } -- 2.26.2