* Namhyung Kim <namhy...@kernel.org> wrote:
> Hi Ingo,
>
> On Tue, 22 Apr 2014 11:55:57 +0200, Ingo Molnar wrote:
> > I gave it some quick testing and after fixing a trivial merge conflict
> > in tools/lib/lockdep/Makefile all seems to be working fine.
>
> Thanks for testing!
>
> >
> > But while looking at it I remembered one of my old UI complains about
> > perf top and report, the hard to read nature of:
> >
> > Event count (approx.): 226958779
> >
> > the values displayed are typically way too large to be easily human
> > readable. More importantly, they are also nonsensical! That we have a
> > sampling interval and can sum up all the intervals sampled has very
> > little meaning to the overwhelming majority of humans looking at the
> > data.
> >
> > And printing that just spams the visual field and confuses people.
> >
> > People care about the quality and speed of sampling itself, not
> > directly the interval of sampling (which will often be variable with
> > auto-freq sampling).
>
> You meant 'period' by 'interval', right?
Yeah.
> There's --show-total-period option (should be equivalent to -F period
> later) in perf report, so there might be people want to see the numbers
> IMHO.
>
> >
> > So instead of:
> >
> > Samples: 42K of event 'cycles', Event count (approx.): 226958779
> >
> > How about only printing this in 'perf top' and 'perf report':
> >
> > Captured 42.1K 'cycles' event samples
> >
> > Note the extra decimal (which helps monitor smaller changes as well),
> > and note the different wording.
> >
> > Thoughts?
>
> Well, I'm okay to add the extra decimal, but it seems that it only makes
> sense when the unit is 'K'..
>
> And I think it might be worth adding filtered sample count as well if
> filtering is enabled something like:
>
> Captured 13.2K/42.1K 'cycles' event samples
Yeah. Maybe make it:
Filtered 13.2K out of 42.1K 'cycles' event samples
or so.
Thanks,
Ingo
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