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

From: William Lee Irwin III (
Date: Fri Jul 18 2003 - 14:57:47 EST

On Fri, Jul 18, 2003 at 11:18:50AM -0700, Mike Kravetz wrote:
> On a somewhat related note ...
> We (Big Blue) have a performance reporting application that
> would like to know how long a task sits on a runqueue before
> it is actually given the CPU. In other words, it wants to
> know how long the 'runnable task' was delayed due to contention
> for the CPU(s). Of course, one could get an overall feel for
> this based on total runqueue length. However, this app would
> really like this info on a per-task basis.
> Does anyone else think this type of info would be useful?
> A patch to compute/export this info should be straight forward
> to implement.

I wrote something to collect the standard queueing statistics a while
back but am not sure what I did with it. I think Rick Lindsley might
still have a copy around.

-- wli
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