linux-kernel - Re: [PATCH 2/3] perf hists: Link hist entries before inserting to an output tree

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Date:	Thu, 06 Dec 2012 10:07:09 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf hists: Link hist entries before inserting to an output tree

On Wed, 5 Dec 2012 20:15:47 +0100, Jiri Olsa wrote:
> On Wed, Dec 05, 2012 at 08:06:46PM +0100, Jiri Olsa wrote:
>> On Wed, Dec 05, 2012 at 03:56:42PM +0900, Namhyung Kim wrote:
>> > From: Namhyung Kim <namhyung.kim@....com>
>> > @@ -481,6 +459,11 @@ static void hists__process(struct hists *old, struct hists *new)
>> >  	else
>> >  		hists__link(new, old);
>> >  
>> > +	hists__output_resort(new);
>> > +
>> > +	if (show_displacement)
>> > +		hists__compute_position(new);
>> > +
>> 
>> Computing the position after hists__link screws up the position data,
>> because we likely have new entries in.
>> 
>> However, I wonder if anyone is actualy using displacement info..?
>
> hum,
>
> the point of the displacement is to show how far is the matching entry
> in baseline wrt report output -> after hists__output_resort.. that goes
> in opposite way of what we try do to in here.
>
> Anyone else in favour of removing 'Displ.' column? ;-)

Oh, I somehow thought that the new dummy entries go into the baseline.
It's your change in the multi-diff patchset, not current code, right?

So we can change either the baseline to have dummies or skipping dummies
when computing their position.  Of course I have no objection to get rid
of the displacement logic completely too. :)

Thanks,
Namhyung
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