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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-08-14 15:47:30 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-08-15 10:55:46 +0200
commit75c5158f70c065b9704b924503d96e8297838f79 (patch)
tree74b02ba1f13aaf8292bd472a8a197ac900ff20e7 /include
parent2ba2a3054fdffc8e6452f4ee120760322a6fbd43 (diff)
timekeeping: Update clocksource with stop_machine
update_wall_time calls change_clocksource HZ times per second to check if a new clock source is available. In close to 100% of all calls there is no new clock. Replace the tick based check by an update done with stop_machine. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Daniel Walker <dwalker@fifo99.com> LKML-Reference: <20090814134810.711836357@de.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/clocksource.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index e34015effeb..9ea40ff26f0 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -291,4 +291,6 @@ static inline void update_vsyscall_tz(void)
}
#endif
+extern void timekeeping_notify(struct clocksource *clock);
+
#endif /* _LINUX_CLOCKSOURCE_H */