Messages in this thread |  | | Date | Thu, 3 May 2001 21:09:04 +0200 | From | Pavel Machek <> | Subject | Re: X15 alpha release: as fast as TUX but in user space (fwd) |
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Hi!
> > > > 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
That means that for fooling closed-source statically-linked binary, you now need to patch kernel. That's regression; subterfugue.org could do this with normal user rights in 2.4.0. -- 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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