Re: [RFC/PATCHSET 00/14] perf report: Add support to accumulate histperiods (v2)

[Ingo Molnar]

* Frederic Weisbecker <fweisbec@xxxxxxxxx> wrote:

> On Mon, Nov 11, 2013 at 01:13:52PM +0100, Ingo Molnar wrote:
> > 
> > It's not an irrelevant feature at all! :-)
> > 
> > It's just that for any sort of longer profile it was pretty 
> > difficult/frustrating to use, which I think held back adoption.
> > 
> > That performance problem got fixed now by you and Namhyung, so I think 
> > we'll see even wider adoption of call-graph profiling...
> 
> Ah I see now. At the time Linus reported his issue, I had the feeling 
> his usecase was a bit "extreme", but I actually have no idea how far 
> perf can be used given that I'm mostly used to short benchmarks, 
> typically hackbench, perf bench sched messaging et al. Thing is I don't 
> use it enough for my real usecases :)

Well, it's a bit of a catch-22: if there are severe scalability problems 
for a usecase then people won't use it because they cannot use it. So 
developers should usually try to over-measure things and go for extreme 
uses and such.

Thanks,

	Ingo
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