From: Andi Kleen <andi@firstfloor.org>
Date: Wed, 14 Nov 2007 13:38:38 +0100

quoted text
> At least for x86 and I suspect some 1other architectures we don't
> initially need a syscall at all for this. There is an instruction
> RDPMC who can read a performance counter just fine. It is also much
> faster and generally preferable for the case where a process measures
> events about itself. In fact it is essential for one of the use cases
> I would like to see perfmon used (replacement of RDTSC for cycle
> counting) 

I wouldn't even want to use a syscall for something like
that on Sparc, I'd rather give this a dedicated software
trap so that I can code it completely in assembler.
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