Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759584Ab3DCIM1 (ORCPT ); Wed, 3 Apr 2013 04:12:27 -0400 Received: from mga01.intel.com ([192.55.52.88]:14842 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759242Ab3DCIMY (ORCPT ); Wed, 3 Apr 2013 04:12:24 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,399,1363158000"; d="scan'208";a="312864344" Message-ID: <515BE452.4030002@intel.com> Date: Wed, 03 Apr 2013 16:12:02 +0800 From: Alex Shi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130221 Thunderbird/17.0.3 MIME-Version: 1.0 To: Alex Shi CC: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, akpm@linux-foundation.org, arjan@linux.intel.com, bp@alien8.de, pjt@google.com, namhyung@kernel.org, efault@gmx.de, vincent.guittot@linaro.org, gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org Subject: Re: [patch v6 11/21] sched: detect wakeup burst with rq->avg_idle References: <1364654108-16307-1-git-send-email-alex.shi@intel.com> <1364654108-16307-12-git-send-email-alex.shi@intel.com> In-Reply-To: <1364654108-16307-12-git-send-email-alex.shi@intel.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2823 Lines: 82 On 03/30/2013 10:34 PM, Alex Shi wrote: The 'sysctl_sched_burst_threshold' used for wakeup burst, since we will check every cpu's avg_idle, the value get be more precise, set 0.1ms. patch updated. ======== >From 67192d87f9656c3e72bc108ef4648de55d470f4a Mon Sep 17 00:00:00 2001 From: Alex Shi Date: Thu, 21 Mar 2013 14:23:00 +0800 Subject: [PATCH 11/21] sched: add sched_burst_threshold_ns as wakeup burst indicator rq->avg_idle is 'to used to accommodate bursty loads in a dirt simple dirt cheap manner' -- Mike Galbraith. With this cheap and smart bursty indicator, we can find the wake up burst, and just use nr_running as instant utilization only. The 'sysctl_sched_burst_threshold' used for wakeup burst, since we will check every cpu's avg_idle, the value get be more precise, set 0.1ms. Signed-off-by: Alex Shi --- include/linux/sched/sysctl.h | 1 + kernel/sched/fair.c | 1 + kernel/sysctl.c | 7 +++++++ 3 files changed, 9 insertions(+) diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index bf8086b..a3c3d43 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -53,6 +53,7 @@ extern unsigned int sysctl_numa_balancing_settle_count; #ifdef CONFIG_SCHED_DEBUG extern unsigned int sysctl_sched_migration_cost; +extern unsigned int sysctl_sched_burst_threshold; extern unsigned int sysctl_sched_nr_migrate; extern unsigned int sysctl_sched_time_avg; extern unsigned int sysctl_timer_migration; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0c08773..f610313 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -91,6 +91,7 @@ unsigned int sysctl_sched_wakeup_granularity = 1000000UL; unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL; const_debug unsigned int sysctl_sched_migration_cost = 500000UL; +const_debug unsigned int sysctl_sched_burst_threshold = 100000UL; /* * The exponential sliding window over which load is averaged for shares diff --git a/kernel/sysctl.c b/kernel/sysctl.c index afc1dc6..1f23457 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -327,6 +327,13 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "sched_burst_threshold_ns", + .data = &sysctl_sched_burst_threshold, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { .procname = "sched_nr_migrate", .data = &sysctl_sched_nr_migrate, .maxlen = sizeof(unsigned int), -- 1.7.12 -- Thanks Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/