From patchwork Thu Jul 3 16:26:06 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Morten Rasmussen X-Patchwork-Id: 4476181 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 309DF9F387 for ; Thu, 3 Jul 2014 16:28:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5DC29201FB for ; Thu, 3 Jul 2014 16:28:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 884CC203AC for ; Thu, 3 Jul 2014 16:28:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759512AbaGCQ2F (ORCPT ); Thu, 3 Jul 2014 12:28:05 -0400 Received: from service87.mimecast.com ([91.220.42.44]:51960 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759186AbaGCQ2D (ORCPT ); Thu, 3 Jul 2014 12:28:03 -0400 Received: from cam-owa2.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Thu, 03 Jul 2014 17:26:22 +0100 Received: from e103034-lin.cambridge.arm.com ([10.1.255.212]) by cam-owa2.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Thu, 3 Jul 2014 17:26:21 +0100 From: Morten Rasmussen To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, peterz@infradead.org, mingo@kernel.org Cc: rjw@rjwysocki.net, vincent.guittot@linaro.org, daniel.lezcano@linaro.org, preeti@linux.vnet.ibm.com, Dietmar.Eggemann@arm.com, pjt@google.com Subject: [RFCv2 PATCH 19/23] sched: Task wakeup tracking Date: Thu, 3 Jul 2014 17:26:06 +0100 Message-Id: <1404404770-323-20-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1404404770-323-1-git-send-email-morten.rasmussen@arm.com> References: <1404404770-323-1-git-send-email-morten.rasmussen@arm.com> X-OriginalArrivalTime: 03 Jul 2014 16:26:21.0881 (UTC) FILETIME=[86B16290:01CF96DB] X-MC-Unique: 114070317262200601 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Track task wakeup rate in wakeup_avg_sum by counting wakeups. Note that this is _not_ cpu wakeups (idle exits). Task wakeups only cause cpu wakeups if the cpu is idle when the task wakeup occurs. The wakeup rate decays over time at the same rate as used for the existing entity load tracking. Unlike runnable_avg_sum, wakeup_avg_sum is counting events, not time, and is therefore theoretically unbounded and should be used with care. Signed-off-by: Morten Rasmussen --- include/linux/sched.h | 3 +++ kernel/sched/fair.c | 18 ++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index faebd87..5f854b2 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1107,6 +1107,9 @@ struct sched_avg { s64 decay_count; unsigned long load_avg_contrib; unsigned long uw_load_avg_contrib; + + unsigned long last_wakeup_update; + u32 wakeup_avg_sum; }; #ifdef CONFIG_SCHEDSTATS diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 44ba754..6da8e2b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -679,6 +679,8 @@ void init_task_runnable_average(struct task_struct *p) p->se.avg.runnable_avg_sum = slice; p->se.avg.runnable_avg_period = slice; __update_task_entity_contrib(&p->se); + + p->se.avg.last_wakeup_update = jiffies; } #else void init_task_runnable_average(struct task_struct *p) @@ -4112,6 +4114,21 @@ static void record_wakee(struct task_struct *p) } } +static void update_wakeup_avg(struct task_struct *p) +{ + struct sched_entity *se = &p->se; + struct sched_avg *sa = &se->avg; + unsigned long now = ACCESS_ONCE(jiffies); + + if (time_after(now, sa->last_wakeup_update)) { + sa->wakeup_avg_sum = decay_load(sa->wakeup_avg_sum, + jiffies_to_msecs(now - sa->last_wakeup_update)); + sa->last_wakeup_update = now; + } + + sa->wakeup_avg_sum += 1024; +} + static void task_waking_fair(struct task_struct *p) { struct sched_entity *se = &p->se; @@ -4132,6 +4149,7 @@ static void task_waking_fair(struct task_struct *p) se->vruntime -= min_vruntime; record_wakee(p); + update_wakeup_avg(p); } #ifdef CONFIG_FAIR_GROUP_SCHED