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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2

include/linux/clocksource.h

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112

kernel/time/clocksource.c

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41

kernel/time/timekeeping.c

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