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

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Message-ID: <20170316184918.5dy7l5k2t5tkptib@hirez.programming.kicks-ass.net>
Date:   Thu, 16 Mar 2017 19:49:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vince Weaver <vincent.weaver@...ne.edu>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: massive perf_event slowdown between 4.9 and 4.11-rc

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.