Messages in this thread |  | | Date | Mon, 30 Apr 2001 10:42:31 +0200 | From | Pavel Machek <> | Subject | Re: X15 alpha release: as fast as TUX but in user space (fwd) |
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Hi!
> > > 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.
Just wait what kind of problems it is able to bring on i386.
Pavel PS: Hmm, how do you do timewarp for just one userland appliation with this installed?
-- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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