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timers: Logic to move non pinned timers

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

This patch migrates all non pinned timers and hrtimers to the current
idle load balancer, from all the idle CPUs. Timers firing on busy CPUs
are not migrated.

While migrating hrtimers, care should be taken to check if migrating
a hrtimer would result in a latency or not. So we compare the expiry of the
hrtimer with the next timer interrupt on the target cpu and migrate the
hrtimer only if it expires *after* the next interrupt on the target cpu.
So, added a clockevents_get_next_event() helper function to return the
next_event on the target cpu's clock_event_device.

[ tglx: cleanups and simplifications ]

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 12:16:41 +05:30 • committed by Thomas Gleixner
commit eea08f32ad
6 changed files with 101 additions and 5 deletions
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12
include/linux/sched.h
View file

@ -257,6 +257,7 @@ extern void task_rq_unlock_wait(struct task_struct *p);
extern cpumask_var_t nohz_cpu_mask;
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
extern int select_nohz_load_balancer(int cpu);
extern int get_nohz_load_balancer(void);
#else
static inline int select_nohz_load_balancer(int cpu)
{
@ -1772,6 +1773,17 @@ int sched_nr_latency_handler(struct ctl_table *table, int write,
struct file *file, void __user *buffer, size_t *length,
loff_t *ppos);
#endif
#ifdef CONFIG_SCHED_DEBUG
static inline unsigned int get_sysctl_timer_migration(void)
{
return sysctl_timer_migration;
}
#else
static inline unsigned int get_sysctl_timer_migration(void)
{
return 1;
}
#endif
extern unsigned int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;