Date: Thu, 20 Feb 2014 13:03:16 -0500 (EST)
From: Vince Weaver <vincent.weaver@maine.edu>
To: Peter Zijlstra <peterz@infradead.org>
cc: Dave Jones <davej@redhat.com>, Linux Kernel <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>,
        Steven Rostedt <rostedt@goodmis.org>
Subject: Re: x86_pmu_start WARN_ON.
In-Reply-To: <20140220100830.GN6835@laptop.programming.kicks-ass.net>
Message-ID: <alpine.DEB.2.10.1402201302150.24360@vincent-weaver-1.um.maine.edu>
References: <20140211132956.GY9987@twins.programming.kicks-ass.net> <alpine.DEB.2.10.1402121559350.20738@vincent-weaver-1.um.maine.edu> <alpine.DEB.2.10.1402130910520.22057@vincent-weaver-1.um.maine.edu> <alpine.DEB.2.10.1402131234160.22113@vincent-weaver-1.um.maine.edu>
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On Thu, 20 Feb 2014, Peter Zijlstra wrote:

> On Wed, Feb 19, 2014 at 05:34:49PM -0500, Vince Weaver wrote:
> > So where would the NMI counter event get disabled?  Would it never get 
> > disabled, just because it's always running and always gets the same fixed 
> > slot?  Why isn't this a problem all the time, not just with corner cases?
> 
> Well it could get another counter assignment I suppose; there's no
> guarantee it always ends up in the fixed counter although that's rather
> likely.
> 
> > Is somehow n_added getting confused?
> 
> I'd expect worse than a warning if that happened, but who knows.
> 
> You could try with the below; make sure you've got CONFIG_FUNCTION_TRACER=y.

> # cat /debug/tracing/trace | bzip2 -9 > ~/trace.bz2
> 
> And send that (and look at it of course).

attached, it's not very big.  

Vince
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