Re: x86_pmu_start WARN_ON.

[Vince Weaver]

On Thu, 20 Feb 2014, Vince Weaver wrote:

> Might be relevant: check the last_cpu values.  Right before the above
> it looks like the thread gets moved from CPU 1 to CPU 0
> (possibly as a result of the long chain started with the
> close() of the tracepoint event),
> so the problem NMI watchdog event being enabled is a different one than 
> the one that was disabled just before.

so is this a false warning?  If you get scheduled to a new CPU
and there's an already running CPU-wide event, is that OK?

Or should x86_pmu_disable() be setting PERF_HES_STOPPED on all events?
It looks like other architectures are (such as armpmu_stop() ).

Vince

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