Re: [PATCH 0/5] perf events finer grained context instrumentation /context exclusion

From: Ingo Molnar
Date: Thu Jun 10 2010 - 02:26:39 EST

* Frederic Weisbecker <fweisbec@xxxxxxxxx> 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.?


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