Messages in this thread | | | Date | Thu, 10 Jun 2010 08:26:18 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 0/5] perf events finer grained context instrumentation / context exclusion |
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* Frederic Weisbecker <fweisbec@gmail.com> wrote:
> Here is the new version of per context exclusion, based on hooks on > irq_enter/irq_exit. I haven't observed slowdowns but I haven't actually > measured the impact.
One thing that would be nice to see in this discussion is a comparison of before/after perf stat --repeat runs.
Something like:
perf stat --repeat ./hackbench 5
Done with full stat, and then also done with hardirqs/softirqs excluded. (i.e. task context stats only)
I.e. does the feature really give us the expected statistical stability in results? Does it really exclude hardirq/softirq workloads, etc.?
Thanks,
Ingo
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