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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>
This commit is contained in:
Arun R Bharadwaj 2009-04-16 12:15:34 +05:30 committed by Thomas Gleixner
parent 5c333864a6
commit cd1bb94b4a
3 changed files with 11 additions and 0 deletions
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1
include/linux/sched.h
View File

@ -1766,6 +1766,7 @@ extern unsigned int sysctl_sched_child_runs_first;
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,

2
kernel/sched.c
View File

@ -8731,6 +8731,8 @@ void __init sched_init_smp(void)
}
#endif /* CONFIG_SMP */
const_debug unsigned int sysctl_timer_migration = 1;
int in_sched_functions(unsigned long addr)
{
return in_lock_functions(addr) ||

8
kernel/sysctl.c
View File

@ -324,6 +324,14 @@ 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,