[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] write_tsc in a PV domain?
On 08/31/09 11:11, Dan Magenheimer wrote: > I'm experimenting with clock_gettime(), gettimeofday(), > and rdtsc with a 2.6.30 64-bit pvguest. I have tried both > with kernel.vsyscall64 equal to 0 and 1 (but haven't seen > any significant difference between the two). I have > confirmed from sysfs that clocksource=xen > Yeah, as I said, I wouldn't expect vsyscall to work under Xen at the moment; the Xen clocksource will disable it. Clocksources can implement a "vread" method for use from a vsyscall, but from a quick look it didn't appear we could use it as-is (because the pvclock info isn't mapped into userspace, and the current vsyscall code assumes a single set of parameters rather than percpu). J _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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