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

Ingo Molnar
2013-11-11T13:56:48Z

* Frederic Weisbecker <fweisbec@gmail.com> 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