Messages in this thread | | | Date | Thu, 03 May 2001 14:23:33 +0200 | From | Helge Hafting <> | Subject | Re: X15 alpha release: as fast as TUX but in user space (fwd) |
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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
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