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Commit cd1bb94b authored Apr 16, 2009 by Arun R Bharadwaj Committed by Thomas Gleixner May 13, 2009

timers: /proc/sys sysctl hook to enable timer migration



* Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2009-04-16 12:11:36]:

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 <arun@linux.vnet.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 5c333864

include/linux/sched.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1766,6 +1766,7 @@ extern unsigned int sysctl_sched_child_runs_first;
	extern unsigned int sysctl_sched_features;		extern unsigned int sysctl_sched_features;
	extern unsigned int sysctl_sched_migration_cost;		extern unsigned int sysctl_sched_migration_cost;
	extern unsigned int sysctl_sched_nr_migrate;		extern unsigned int sysctl_sched_nr_migrate;
			extern unsigned int sysctl_timer_migration;

	int sched_nr_latency_handler(struct ctl_table *table, int write,		int sched_nr_latency_handler(struct ctl_table *table, int write,
	struct file file, void __user buffer, size_t *length,		struct file file, void __user buffer, size_t *length,

kernel/sched.c

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -8731,6 +8731,8 @@ void __init sched_init_smp(void)
	}		}
	#endif /* CONFIG_SMP */		#endif /* CONFIG_SMP */

			const_debug unsigned int sysctl_timer_migration = 1;

	int in_sched_functions(unsigned long addr)		int in_sched_functions(unsigned long addr)
	{		{
	return in_lock_functions(addr) \|\|		return in_lock_functions(addr) \|\|

kernel/sysctl.c

+8 −0

Original line number	Original line	Diff line number	Diff line
	@@ -324,6 +324,14 @@ static struct ctl_table kern_table[] = {
	.mode = 0644,		.mode = 0644,
	.proc_handler = &proc_dointvec,		.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		#endif
	{		{
	.ctl_name = CTL_UNNUMBERED,		.ctl_name = CTL_UNNUMBERED,