Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932933Ab3DDCFE (ORCPT ); Wed, 3 Apr 2013 22:05:04 -0400 Received: from mga03.intel.com ([143.182.124.21]:29708 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932558Ab3DDCCc (ORCPT ); Wed, 3 Apr 2013 22:02:32 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,404,1363158000"; d="scan'208";a="280534441" From: Alex Shi To: 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, morten.rasmussen@arm.com Cc: vincent.guittot@linaro.org, gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, alex.shi@intel.com, len.brown@intel.com, rafael.j.wysocki@intel.com, jkosina@suse.cz, clark.williams@gmail.com, tony.luck@intel.com, keescook@chromium.org, mgorman@suse.de, riel@redhat.com Subject: [patch v7 11/21] sched: add sched_burst_threshold_ns as wakeup burst indicator Date: Thu, 4 Apr 2013 10:00:52 +0800 Message-Id: <1365040862-8390-12-git-send-email-alex.shi@intel.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1365040862-8390-1-git-send-email-alex.shi@intel.com> References: <1365040862-8390-1-git-send-email-alex.shi@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2365 Lines: 66 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 -- 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/