linux-kernel - Re: [PATCH v2 2/2] perf stat: add interval printing

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Date:	Fri, 18 Jan 2013 15:09:02 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH v2 2/2] perf stat: add interval printing

SNIP

> >> -     if (status != -1)
> >> +     if (status != -1 && !interval)
> >>               print_stat(argc, argv);
> >
> > The way this is done prevents final stats to be printed,
> > which seems unfortunate.
> >
> This is on purpose. All we care about here is the spaced deltas.
> Note that I also removed the shadow stats. Tried to make them
> work for a while but it did not make sense especially for -a -A.
> I don't think it even works right now.
> 
> > Actually I don't mind that much, because I haven't even thought about
> > this feature, but looks like it could be done separately with no affect
> > to final counts.
> >
> Initially I had it as raw_counts, prev_raw_counts. But then it would
> cause problems with the stats. So I simplified everything, it uses
> less memory and gives me the output I care about.
> 
> If you want total count, then don't use this new option. The results
> are to be fed to a plotter, so the final counts are useless and complicate
> the post-processing.

ok, agreed

jirka

> 
> > But since you probably use it mostly for feeding some graph ploting
> > program, it's probably fine.. just feels wrong ;-)
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