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

[Ingo Molnar]

* 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.?

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/