timer stats: speedups

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Make timer-stats have almost zero overhead when enabled in the config but
not used.  (this way distros can enable it more easily)

Also update the documentation about overhead of timer_stats - it was
written for the first version which had a global lock and a linear list
walk based lookup ;-)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Ingo Molnar 2007-06-01 00:47:16 -07:00 • committed by Linus Torvalds

parent 9fcc15ec3c

commit c1a834dc70

3 changed files with 14 additions and 5 deletions

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kernel/time/timer_stats.c

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