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SubjectRe: [PATCH] improve OProfile on many-way systems

> Anyway. My question was mainly a prod in the antonward direction ;)

And Im prepared this time :) An excerpt from my test results a few
months ago:

> I ran a fork/exit intensive benchmark (sdet) on a big machine.
>
> No patch:
> Enabling oprofile resulted in over a 10 times slow down in performance.
>
> oprofile1.patch:
> About 2% slowdown when oprofile enabled
>
> oprofile2.patch:
> About 5% slowdown when oprofile enabled

The final version was actually oprofile3.patch but it had a similar (10
times) gain in sdet performance.

So the patch is good stuff. Ive been running it locally for the last few
months without a problem.

Anton
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