[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] Re: rdtsc hypercall, from userland?!? (was: rdtsc: correctness vs performance on Xen)
> While possible, I'd suspect that the good performance you see for > 64-bits wouldn't hold: You can't (without potential for ambiguity) > re-use syscall for this purpose. I'll bet all current 64b PV OSes use EAX as a simple system call number, so it's probably possible to do something hacky with negative values, after suitable auditing of current PV OSes and other common OSes. Not pretty, but I wouldn't throw the scheme out if an audit confirms the behaviour. Ian _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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