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SubjectRe: FOR REVIEW: New x86-64 vsyscall vgetcpu()
Interesting - thanks Andi.

I had one of my colleagues at SGI lobby me hard for such a facility.
I'll see if I can get him on this thread to better explain what he
wanted it for.

Roughly, he was looking to support something resembling the kernel's
per-cpu data in userland library code for high performance scientific
number crunching, for things like statistics gathering and perhaps (not
sure of this) reduce locking costs.

I see "x86-64" in the Subject. I don't see why this facility is
arch-specific. Could it work on any arch, ia64 being the one of
interest to me?

I have some ignorance on your references to "CPUID(1)". I don't recall
what it is. The only command so named I find on my systems are a
Windows command from the year 1999. I doubt that's it. You wrote:

> As you can see CPUID(1) is always very slow

but but I don't see any stats above the comment mentioning CPUID(1),
so ... er eh ... no I don't see.

--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401
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