Messages in this thread | | | Date | Mon, 8 Jul 2013 13:54:01 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH] perf: fix interrupt handler timing harness |
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> 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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