Messages in this thread | | | Date | Mon, 3 Mar 2014 10:16:37 +0100 | From | Peter Zijlstra <> | Subject | Re: 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 :/
| |