Re: x86_pmu_start WARN_ON.

[Vince Weaver]

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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