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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
parent cd1bb94b4a
commit eea08f32ad
6 changed files with 101 additions and 5 deletions
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9
include/linux/clockchips.h
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@@ -143,3 +143,12 @@ extern void clockevents_notify(unsigned long reason, void *arg);
#endif
#endif
#ifdef CONFIG_GENERIC_CLOCKEVENTS
extern ktime_t clockevents_get_next_event(int cpu);
#else
static inline ktime_t clockevents_get_next_event(int cpu)
{
return (ktime_t) { .tv64 = KTIME_MAX };
}
#endif