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Re: [Xen-devel] Recent trace patch not arch-neutral
Rob Gardner wrote:
Now, to answer Dan's question- the rdtscll thing is just a time stamp
counter, expressed in cycles. So on ia64 you could probably replace it
with an asm statement to read ar.itc to make everything work. We just
need a little wrapper to do the right thing for each architecture. Now
Dan, if you were more conveniently located, perhaps we could work
together and fix this. ;)
I imagine we just need something that looks like this in trace.c:
#ifdef x86
rdtscll(rec->cycles);
#endif
#ifdef IA64
__asm__ __volatile ("mov %0=ar.itc;;" : "=r"(rec->cycles) ::
"memory");
#endif
Dan, perhaps you know the nice clean way of doing this sort of thing?
Rob
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