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

[Helge Hafting]

Pavel Machek 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.

>                                                                 Pavel
> PS: Hmm, how do you do timewarp for just one userland appliation with
> this installed?

1. Kernel solution: give that particular process a different magic page
2. User solution:   Don't obtain time from the magic page.
2a                  By changing program source, if available
2b                  By switching the c library, assuming it is used

Helge Hafting
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