Andi Kleen wrote: > Do you have some lmbench numbers before/after this change? > iirc at least fork and exit do a lot of pte accesses in various forms. > If it's measurable it might be needed to patch those for the native case. > I don't. I think Rusty ran some numbers and found the pte accessors became the most commonly used paravirt ops. I'm working on revamping the pv_ops patching infrastructure at the moment, so we should be able to deal with these fairly efficiently. J