linux-kernel - Re: perf: bug in rdpmc/mmap accounting after exec

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Message-ID: <alpine.DEB.2.20.1708031402320.26654@macbook-air>
Date:   Thu, 3 Aug 2017 14:04:17 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Stephane Eranian <eranian@...il.com>
Subject: Re: perf: bug in rdpmc/mmap accounting after exec

On Wed, 2 Aug 2017, Peter Zijlstra wrote:

> On Wed, Jul 26, 2017 at 03:39:01PM -0400, Vince Weaver wrote:
> > In fact, current->mm->context.perf_rdpmc_allowed goes negative which seems
> > like it shouldn't happen?

>
> Good find that...
> 
> The below seems to fix that for me.

yes, I can confirm that with this patch all of the various PAPI and 
perf_event_tests pass on my test system.

Thanks,

Vince