From nobody Sun Dec 14 12:13:04 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA3DAC001DC for ; Thu, 27 Jul 2023 06:40:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231614AbjG0GkP (ORCPT ); Thu, 27 Jul 2023 02:40:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232805AbjG0Gj7 (ORCPT ); Thu, 27 Jul 2023 02:39:59 -0400 Received: from mgamail.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81C8B2129 for ; Wed, 26 Jul 2023 23:39:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1690439991; x=1721975991; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=2tUSZMdSmW/MZmHWfmtvUAfg03unaamp6z41Ty0I/Fk=; b=VE5KPygDoUrmAUBxeFBAT5ujtTGSW5Z/OEjLOMSsJUbawqLLaQlI0GLq S7eoIH9sesQ46aAcR0F8qVfS33QLnFXj7paRz6qQ/w71cAkQyD6SBD5+F vrawCUyWVkMfZl34kZODn9PBw91WfkbqP1ZcrgUV5bfs7nVAndwe75V8g 7kVa1FodNeO3o7GRO0FonPSdrJBAaiIzYFP63uG5jBRQRf8WblUSWcF4+ sCLOUod7+M9yN0QfS+9S3TIgShKjHFcfK4LqEAMyjEAJKw4Ce17grrmRn IYyqUEU1sBkRZlLjwRd/DyR6jww8IcBCIaBLXgCndLm0aaB5n0uFOoYCH Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10783"; a="454589658" X-IronPort-AV: E=Sophos;i="6.01,234,1684825200"; d="scan'208";a="454589658" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jul 2023 23:39:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10783"; a="792191955" X-IronPort-AV: E=Sophos;i="6.01,234,1684825200"; d="scan'208";a="792191955" Received: from chenyu-dev.sh.intel.com ([10.239.62.164]) by fmsmga008.fm.intel.com with ESMTP; 26 Jul 2023 23:39:47 -0700 From: Chen Yu To: Peter Zijlstra , Vincent Guittot Cc: Ingo Molnar , Juri Lelli , Tim Chen , Mel Gorman , Dietmar Eggemann , K Prateek Nayak , "Gautham R . Shenoy" , Chen Yu , Aaron Lu , linux-kernel@vger.kernel.org, Chen Yu Subject: [RFC PATCH 7/7] sched/stats: Track the scan number of groups during load balance Date: Thu, 27 Jul 2023 22:35:36 +0800 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This metric could be used to evaluate the load balance cost and effeciency. Signed-off-by: Chen Yu --- include/linux/sched/topology.h | 1 + kernel/sched/fair.c | 2 ++ kernel/sched/stats.c | 5 +++-- 3 files changed, 6 insertions(+), 2 deletions(-) diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h index af2261308529..fa8fc6a497fd 100644 --- a/include/linux/sched/topology.h +++ b/include/linux/sched/topology.h @@ -124,6 +124,7 @@ struct sched_domain { unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; + unsigned int lb_sg_scan[CPU_MAX_IDLE_TYPES]; =20 /* Active load balancing */ unsigned int alb_count; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9af57b5a24dc..96df7c5706d1 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -10253,6 +10253,8 @@ static inline void update_sd_lb_stats(struct lb_env= *env, struct sd_lb_stats *sd goto next_group; =20 =20 + schedstat_inc(env->sd->lb_sg_scan[env->idle]); + if (update_sd_pick_busiest(env, sds, sg, sgs)) { sds->busiest =3D sg; sds->busiest_stat =3D *sgs; diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c index 857f837f52cb..38608f791363 100644 --- a/kernel/sched/stats.c +++ b/kernel/sched/stats.c @@ -152,7 +152,7 @@ static int show_schedstat(struct seq_file *seq, void *v) cpumask_pr_args(sched_domain_span(sd))); for (itype =3D CPU_IDLE; itype < CPU_MAX_IDLE_TYPES; itype++) { - seq_printf(seq, " %u %u %u %u %u %u %u %u", + seq_printf(seq, " %u %u %u %u %u %u %u %u %u", sd->lb_count[itype], sd->lb_balanced[itype], sd->lb_failed[itype], @@ -160,7 +160,8 @@ static int show_schedstat(struct seq_file *seq, void *v) sd->lb_gained[itype], sd->lb_hot_gained[itype], sd->lb_nobusyq[itype], - sd->lb_nobusyg[itype]); + sd->lb_nobusyg[itype], + sd->lb_sg_scan[itype]); } seq_printf(seq, " %u %u %u %u %u %u %u %u %u %u %u %u\n", --=20 2.25.1