Re: [RFC] [Patch 7/8] statistics infrastructure - exploitation prerequisite

From: Peter Chubb
Date: Tue May 16 2006 - 21:14:35 EST

>>>>> "Martin" == Martin Peschke <mp3@xxxxxxxxxx> writes:

Martin> I would be happy to exploit an API that may result from that
Martin> discussion. I would plead for exporting such an API to
Martin> modules. I don't see how to implement statistics for
Martin> latencies, otherwise.

Martin> Any other hints on how to replace my sched_clock() calls are
Martin> welcome. (I want to measure elapsed times in units that are
Martin> understandable to users without hardware manuals and
Martin> calculator, such as milliseconds.)

You may wish to look at the microstate accounting patches at
I made the clock source configurable.

It's acually rather difficult to find a reliable cross-platform
monotonic clock with good resolution. And different statistics may
want different clocks; for my purposes a cycle counter is best
(because I'm running on a machine that varies the clock speed for
power management reasons), other people may want nanoseconds.

Dr Peter Chubb peterc AT ERTOS within National ICT Australia
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at