Re: [PATCH] perf: fix interrupt handler timing harness

[Andi Kleen]

> I did a quite a bit of ftracing to look for spots inside the handler
> which were taking large amounts of time.  There were none.  The
> execution time was spread very evenly over the entire nmi handler.  It
> didn't appear to be any individual hot cachelines or doing something
> silly like sitting in a loop handling lots of PMU events.

In some cases callgraphs seemed to be quite expensive (large fraction
of the handler time)

-Andi
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