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Date: Mon, 3 Mar 2014 10:16:37 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
"H. Peter Anvin" <hpa@...or.com>,
Vince Weaver <vincent.weaver@...ne.edu>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
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 :/
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