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

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Message-ID: <alpine.DEB.2.20.1703161356180.695@macbook-air>
Date:   Thu, 16 Mar 2017 13:57:31 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Vince Weaver <vincent.weaver@...ne.edu>
cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.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, 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