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SubjectRe: Performance overhead of get_cycles_sync

* Arjan van de Ven <> wrote:

> > * Dor Laor <> wrote:
> >
> > The patch below should resolve this - could you please test and Ack
> > it? But this CPUID was present in v2.6.23 too, so why did it only
> > show up in 2.6.24-rc for you?
> isn't this probably wrong since this code is also used in the vsyscall
> code..

the TSC clocksource (and hence the vsyscall code) is turned off on
systems that fail the TOD/CLOCK portion of this test:

i.e. on the majority of systems in place.


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