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From: Vince Weaver <vincent.weaver@maine.edu>
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Date: Thu, 16 Mar 2017 13:57:31 -0400 (EDT)
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To: Vince Weaver <vincent.weaver@maine.edu>
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        Arnaldo Carvalho de Melo <acme@kernel.org>
Subject: Re: perf: massive perf_event slowdown between 4.9 and 4.11-rc
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On Thu, 16 Mar 2017, Vince Weaver wrote:

> Anyway all perf_event functionality (especially reads) has become about 
> 20x slower, at least on Intel machines (haswell and skylake are the only 
> ones I've tested) sometime between 4.9 and 4.11-rc

False alarm, I forgot I had debugging (KASAN, etc) turned on in this 
kernel tree because I had been fuzzing.

sorry about that.

Vince