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SubjectRe: X15 alpha release: as fast as TUX but in user space (fwd)

On Wed, 2 May 2001, Andi Kleen wrote:

> > Whatever happened to that hack that was discussed a year or two ago?
> > The one where (also on IA32) a magic page was set up by the kernel
> > containing code for fast system calls, and the kernel would write
> > calibation information to that magic page. The code written there
> > would use the TSC in conjunction with that calibration data.
> >
> > There was much discussion about this idea, even Linus was keen on
> > it. But IIRC, nothing ever happened.
>
> It's already implemented in the x86-64 port, thanks to Andrea
> Arcangelli.

well, it was first prototyped in the vsyscall patches :-)

Ingo

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