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xen-devel
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
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