Re: perf: massive perf_event slowdown between 4.9 and 4.11-rc

[Peter Zijlstra]

On Thu, Mar 16, 2017 at 01:57:31PM -0400, Vince Weaver wrote:
> 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.

Ha! no problem.