From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758283Ab0KROMw (ORCPT ); Thu, 18 Nov 2010 09:12:52 -0500 Received: from hera.kernel.org ([140.211.167.34]:52138 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754022Ab0KROMu (ORCPT ); Thu, 18 Nov 2010 09:12:50 -0500 Date: Thu, 18 Nov 2010 14:12:18 GMT From: tip-bot for Paul Turner Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, a.p.zijlstra@chello.nl, pjt@google.com, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, a.p.zijlstra@chello.nl, pjt@google.com, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <20101115234938.112173964@google.com> References: <20101115234938.112173964@google.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched: Add sysctl_sched_shares_window Message-ID: Git-Commit-ID: a7a4f8a752ec734b2eab904fc863d5dc873de338 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Thu, 18 Nov 2010 14:12:19 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: a7a4f8a752ec734b2eab904fc863d5dc873de338 Gitweb: http://git.kernel.org/tip/a7a4f8a752ec734b2eab904fc863d5dc873de338 Author: Paul Turner AuthorDate: Mon, 15 Nov 2010 15:47:06 -0800 Committer: Ingo Molnar CommitDate: Thu, 18 Nov 2010 13:27:49 +0100 sched: Add sysctl_sched_shares_window Introduce a new sysctl for the shares window and disambiguate it from sched_time_avg. A 10ms window appears to be a good compromise between accuracy and performance. Signed-off-by: Paul Turner Signed-off-by: Peter Zijlstra LKML-Reference: <20101115234938.112173964@google.com> Signed-off-by: Ingo Molnar --- include/linux/sched.h | 1 + kernel/sched_fair.c | 9 ++++++++- kernel/sysctl.c | 7 +++++++ 3 files changed, 16 insertions(+), 1 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 8abb8aa..840f127 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1900,6 +1900,7 @@ extern unsigned int sysctl_sched_migration_cost; extern unsigned int sysctl_sched_nr_migrate; extern unsigned int sysctl_sched_time_avg; extern unsigned int sysctl_timer_migration; +extern unsigned int sysctl_sched_shares_window; int sched_proc_update_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index b320753..6c84439 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -89,6 +89,13 @@ unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL; const_debug unsigned int sysctl_sched_migration_cost = 500000UL; +/* + * The exponential sliding window over which load is averaged for shares + * distribution. + * (default: 10msec) + */ +unsigned int __read_mostly sysctl_sched_shares_window = 10000000UL; + static const struct sched_class fair_sched_class; /************************************************************** @@ -688,7 +695,7 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) #if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED static void update_cfs_load(struct cfs_rq *cfs_rq) { - u64 period = sched_avg_period(); + u64 period = sysctl_sched_shares_window; u64 now, delta; unsigned long load = cfs_rq->load.weight; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 3132b25..9b520d7 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -333,6 +333,13 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "sched_shares_window", + .data = &sysctl_sched_shares_window, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { .procname = "timer_migration", .data = &sysctl_timer_migration, .maxlen = sizeof(unsigned int),