Messages in this thread | | | Date | Sat, 1 Mar 2014 10:16:50 +0100 | From | Ingo Molnar <> | Subject | Re: perf_fuzzer compiled for x32 causes reboot |
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* Steven Rostedt <rostedt@goodmis.org> wrote:
> > Also, this function is called a _LOT_ under certain workloads, I > > don't know how cheap a CR2 read is, but it had better be really > > cheap. > > That's a HPA question.
We read CR2 in the page fault hot path, so it's on the top of CPU architects' minds and it's reasonably optimized. A couple of cycles IIRC, but would be nice to hear actual numbers.
Thanks,
Ingo
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