linux-kernel - Re: [PATCH 0/2] Notifications for perf sideband events

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Date:   Thu, 13 Jul 2017 11:35:08 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
cc:     Jiri Olsa <jolsa@...hat.com>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Notifications for perf sideband events

On Thu, 13 Jul 2017, Naveen N. Rao wrote:

> > could you please check on this? thanks
> > 
> > Naveen,
> > have you run Vince's test suite on this?
> >   http://github.com/deater/perf_event_tests.git
> 
> I just tried this and I see quite a few failures even without these 
> patches.
> 
> The behavior is similar with/without these patches and all the ioctl 
> tests pass, but I see some failures with the overflow tests. I'll look 
> into those tests in detail tomorrow. I may be missing something.

the signal/overflow interface has always been a troublesome one :(
It's part of why I haven't had much to say about the whole kernel 
addresses leaking into samples mess.

I had noticed some of the related overflow tests have been failing 
recently (both in perf_event_tests and in PAPI), but I haven't had
a chance to see if it was an actual regression or just due to the way the 
tests are designed.  I'll see if I can figure out what's going on.

Vince