diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-08-14 15:47:30 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-08-15 10:55:46 +0200 |
| commit | 75c5158f70c065b9704b924503d96e8297838f79 (patch) | |
| tree | 74b02ba1f13aaf8292bd472a8a197ac900ff20e7 /include/linux/clocksource.h | |
| parent | 2ba2a3054fdffc8e6452f4ee120760322a6fbd43 (diff) | |
| download | lwn-75c5158f70c065b9704b924503d96e8297838f79.tar.gz lwn-75c5158f70c065b9704b924503d96e8297838f79.zip | |
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/linux/clocksource.h')
| -rw-r--r-- | include/linux/clocksource.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index e34015effeb6..9ea40ff26f0e 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 */ |