Re: [PATCH 9/9] x86/UV: Add ability to disable UV NMI handler

[Peter Zijlstra]

On Thu, Sep 05, 2013 at 05:50:41PM -0500, Mike Travis wrote:
> For performance reasons, the NMI handler may be disabled to lessen the
> performance impact caused by the multiple perf tools running concurently.
> If the system nmi command is issued when the UV NMI handler is disabled,
> the "Dazed and Confused" messages occur for all cpus.  The NMI handler is
> disabled by setting the nmi disabled variable to '1'.  Setting it back to
> '0' will re-enable the NMI handler.

I'm not entirely sure why this is still needed now that you've moved all
really expensive bits into the UNKNOWN handler.
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