Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756812AbZCDMSk (ORCPT ); Wed, 4 Mar 2009 07:18:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751618AbZCDMSa (ORCPT ); Wed, 4 Mar 2009 07:18:30 -0500 Received: from e28smtp09.in.ibm.com ([59.145.155.9]:44416 "EHLO e28smtp09.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751206AbZCDMS3 (ORCPT ); Wed, 4 Mar 2009 07:18:29 -0500 Date: Wed, 4 Mar 2009 17:48:13 +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: [v2 PATCH 3/4] timers: sysfs hook to enable timer migration Message-ID: <20090304121813.GD9855@linux.vnet.ibm.com> Reply-To: arun@linux.vnet.ibm.com References: <20090304121249.GA9855@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20090304121249.GA9855@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 Content-Length: 2779 Lines: 94 * Arun R Bharadwaj [2009-03-04 17:42:49]: This patch creates the necessary sysfs interface for timer migration. The interface is located at /sys/devices/system/cpu/enable_timer_migration This enables timer migration. echo 1 > /sys/devices/system/cpu/enable_timer_migration similarly, echo 0 > /sys/devices/system/cpu/enable_timer_migration disables timer migration. Signed-off-by: Arun R Bharadwaj --- include/linux/sched.h | 1 + kernel/sched.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) Index: linux.trees.git/include/linux/sched.h =================================================================== --- linux.trees.git.orig/include/linux/sched.h +++ linux.trees.git/include/linux/sched.h @@ -803,6 +803,7 @@ enum powersavings_balance_level { }; extern int sched_mc_power_savings, sched_smt_power_savings; +extern int enable_timer_migration; static inline int sd_balance_for_mc_power(void) { 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; +int enable_timer_migration; /* * The cpus mask in sched_group and sched_domain hangs off the end. @@ -8317,6 +8318,29 @@ static SYSDEV_CLASS_ATTR(sched_smt_power sched_smt_power_savings_store); #endif +static ssize_t timer_migration_show(struct sysdev_class *class, + char *page) +{ + return sprintf(page, "%u\n", enable_timer_migration); +} +static ssize_t timer_migration_store(struct sysdev_class *class, + const char *buf, size_t count) +{ + unsigned int level = 0; + + if (sscanf(buf, "%u", &level) != 1) + return -EINVAL; + + if (level > 1) + return -EINVAL; + + enable_timer_migration = level; + + return count; +} +static SYSDEV_CLASS_ATTR(enable_timer_migration, 0644, + timer_migration_show, + timer_migration_store); int __init sched_create_sysfs_power_savings_entries(struct sysdev_class *cls) { int err = 0; @@ -8331,6 +8355,10 @@ int __init sched_create_sysfs_power_savi err = sysfs_create_file(&cls->kset.kobj, &attr_sched_mc_power_savings.attr); #endif + if (!err) + err = sysfs_create_file(&cls->kset.kobj, + &attr_enable_timer_migration.attr); + return err; } #endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */ -- 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/