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    SubjectRe: perf_fuzzer compiled for x32 causes reboot
    On Sat, Mar 01, 2014 at 10:16:50AM +0100, Ingo Molnar wrote:
    > 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.

    Well, going with what Linus found; it looks like they made page faults
    more expensive on Haswell as compared to previous generations. So its
    not _that_ high on their list :/


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