Re: perf_fuzzer compiled for x32 causes reboot

[Peter Zijlstra]

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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