tree 66a0bc5ffbf6732eaa5fc6f554c13b235005c4cd
parent 9fcc15ec3c1c287a781a4620e52522b6186f26f6
author Ingo Molnar <mingo@elte.hu> 1180684036 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1180711110 -0700

timer stats: speedups

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>