Re: [Lse-tech] [patch 2.6.0-test1] per cpu times

From: Peter Chubb (
Date: Wed Jul 23 2003 - 18:32:48 EST

>>>>> "bill" == bill davidsen <> writes:
>>>>> "Mike" == Mike Kravetz <>

Mike> On a somewhat related note ... We (Big Blue) have a
Mike> performance reporting application that would like to know how
Mike> long a task sits on a runqueue before it is actually given the
Mike> CPU. In other words, it wants to know how long the 'runnable
Mike> task' was delayed due to contention for the CPU(s). Of
Mike> course, one could get an overall feel for this based on total
Mike> runqueue length. However, this app would really like this
Mike> info on a per-task basis.

bill> This is certainly a useful number.

This is exactly what's measured by the microstate accounting patches
I've been pushing to LKML, along with a few other useful statistics.

If you try it, please let me know: see

Dr Peter Chubb  peterc AT
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