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timekeeping: Update clocksource with stop_machine

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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>
This commit is contained in:
Martin Schwidefsky
2009-08-14 15:47:30 +02:00
committed by Thomas Gleixner
parent 2ba2a3054f
commit 75c5158f70
3 changed files with 72 additions and 83 deletions
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include/linux/clocksource.h
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@@ -291,4 +291,6 @@ static inline void update_vsyscall_tz(void)
}
#endif
extern void timekeeping_notify(struct clocksource *clock);
#endif /* _LINUX_CLOCKSOURCE_H */