Messages in this thread |  | | From | "H. Peter Anvin" <> | Subject | Re: X15 alpha release: as fast as TUX but in user space (fwd) | Date | 28 Apr 2001 22:13:11 -0700 |
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Followup to: <200104282256.f3SMuRW15999@vindaloo.ras.ucalgary.ca> By author: Richard Gooch <rgooch@ras.ucalgary.ca> In newsgroup: linux.dev.kernel > > > > In x86-64 there are special vsyscalls btw to solve this problem that export > > a lockless kernel gettimeofday() > > 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. >
We discussed this at the Summit, not a year or two ago. x86-64 has it, and it wouldn't be too bad to do in i386... just noone did.
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