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authorArun R Bharadwaj <arun@linux.vnet.ibm.com>2009-04-16 02:46:41 -0400
committerThomas Gleixner <tglx@linutronix.de>2009-05-13 10:52:42 -0400
commiteea08f32adb3f97553d49a4f79a119833036000a (patch)
tree4e6af5185309d7abe49a8fa19634ea38582381e4 /include/linux/clockchips.h
parentcd1bb94b4a0531e8211a3774f17de831f8285f76 (diff)
timers: Logic to move non pinned timers
* 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>
Diffstat (limited to 'include/linux/clockchips.h')
-rw-r--r--include/linux/clockchips.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 3a1dbba4d3ae..20a100fe2b4f 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -143,3 +143,12 @@ extern void clockevents_notify(unsigned long reason, void *arg);
143#endif 143#endif
144 144
145#endif 145#endif
146
147#ifdef CONFIG_GENERIC_CLOCKEVENTS
148extern ktime_t clockevents_get_next_event(int cpu);
149#else
150static inline ktime_t clockevents_get_next_event(int cpu)
151{
152 return (ktime_t) { .tv64 = KTIME_MAX };
153}
154#endif