From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762900AbZDALgb (ORCPT ); Wed, 1 Apr 2009 07:36:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755574AbZDALgT (ORCPT ); Wed, 1 Apr 2009 07:36:19 -0400 Received: from e28smtp04.in.ibm.com ([59.145.155.4]:57218 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757176AbZDALgS (ORCPT ); Wed, 1 Apr 2009 07:36:18 -0400 Date: Wed, 1 Apr 2009 17:06:05 +0530 From: Arun R Bharadwaj To: linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org Cc: a.p.zijlstra@chello.nl, ego@in.ibm.com, tglx@linutronix.de, mingo@elte.hu, andi@firstfloor.org, venkatesh.pallipadi@intel.com, vatsa@linux.vnet.ibm.com, arjan@infradead.org, svaidy@linux.vnet.ibm.com, Arun Bharadwaj Subject: [v4 RFC PATCH 3/4] timers: /proc/sys sysctl hook to enable timer migration Message-ID: <20090401113605.GD22478@linux.vnet.ibm.com> Reply-To: arun@linux.vnet.ibm.com References: <20090401113128.GA22478@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20090401113128.GA22478@linux.vnet.ibm.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Arun R Bharadwaj [2009-04-01 17:01:28]: This patch creates the /proc/sys sysctl interface at /proc/sys/kernel/timer_migration Timer migration is enabled by default. To disable timer migration, when CONFIG_SCHED_DEBUG = y, echo 0 > /proc/sys/kernel/timer_migration Signed-off-by: Arun R Bharadwaj --- include/linux/sched.h | 1 + kernel/sched.c | 1 + kernel/sysctl.c | 8 ++++++++ 3 files changed, 10 insertions(+) Index: linux.trees.git/include/linux/sched.h =================================================================== --- linux.trees.git.orig/include/linux/sched.h +++ linux.trees.git/include/linux/sched.h @@ -1763,6 +1763,7 @@ extern unsigned int sysctl_sched_child_r extern unsigned int sysctl_sched_features; extern unsigned int sysctl_sched_migration_cost; extern unsigned int sysctl_sched_nr_migrate; +extern unsigned int sysctl_timer_migration; int sched_nr_latency_handler(struct ctl_table *table, int write, struct file *file, void __user *buffer, size_t *length, Index: linux.trees.git/kernel/sysctl.c =================================================================== --- linux.trees.git.orig/kernel/sysctl.c +++ linux.trees.git/kernel/sysctl.c @@ -328,6 +328,14 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "timer_migration", + .data = &sysctl_timer_migration, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, #endif { .ctl_name = CTL_UNNUMBERED, Index: linux.trees.git/kernel/sched.c =================================================================== --- linux.trees.git.orig/kernel/sched.c +++ linux.trees.git/kernel/sched.c @@ -7445,6 +7445,7 @@ static void sched_domain_node_span(int n #endif /* CONFIG_NUMA */ int sched_smt_power_savings = 0, sched_mc_power_savings = 0; +const_debug unsigned int sysctl_timer_migration = 1; /* * The cpus mask in sched_group and sched_domain hangs off the end.