linux-kernel - Re: [PATCH 08/13] perf gtk/browser: Add support for event group view

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Date:	Wed, 23 Jan 2013 14:59:49 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH 08/13] perf gtk/browser: Add support for event group view

Em Tue, Jan 22, 2013 at 02:58:36PM +0900, Namhyung Kim escreveu:
> Hi Arnaldo,
> 
> On Wed, 16 Jan 2013 15:28:59 -0300, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Jan 16, 2013 at 07:25:02PM +0900, Namhyung Kim escreveu:
> >> Adding current header name to event name will fix the problem but it
> >> probably occupies too much screen width especially for long named
> >> tracepoint or PMU-specific events like
> >> "compaction:mm_compaction_isolate_migratepages".
> >> 
> >>   Overhead/branches  Overhead/branch-misses  sys/branches  sys/branch-misses  usr/branches  usr/branch-misses  Command  Shared Object   Symbol
> >>   .................  ......................  ............  .................  ............  .................  .......  .............  .......
> >>              98.32%                  31.16%         0.00%              0.00%        98.32%             31.16%    a.out          a.out  [.] foo
> >> 
> >> 
> >> If you have a better idea or other way to place the cursor without
> >> printing bogus 0.00% on GTK, please let me know.
> >
> > Compacting it using an extra line:
> >
> >  Overhead...............  sys....................  usr....................
> >  branches  branch-misses  branches  branch-misses  branches  branch-misses  Command  Shared Object   Symbol
> >  ........  .............  ........  .............  ........  .............  .......  .............  .......
> >    98.32%         31.16%     0.00%          0.00%    98.32%         31.16%    a.out          a.out  [.] foo
> >
> > It could even use some reference:
> >
> >  Overhead.....................  sys.........  usr...........
> >  branches(1)  branch-misses(2)  (1)    (2)    (1)     (2)     Command  Shared Object   Symbol
> >  ...........  ................  .....  .....  ......  ......  .......  .............  .......
> >       98.32%            31.16%  0.00%  0.00%  98.32%  31.16%    a.out          a.out  [.] foo
> >
> > The (1) could be done with a superscript number or even just using a
> > different fore/background color, to use fewer columns.
> >
> > One other way, that would scale for really long event names, would be to
> > have the event list in the first few lines and then:
> >
> > Events:
> > 1. branches
> > 2. branch-misses
> >
> >  Overhead......  sys.........  usr...........
> >  (1)     (2)     (1)    (2)    (1)     (2)     Command  Shared Object   Symbol
> >  ......  ......  .....  .....  ......  ......  .......  .............  .......
> >  98.32%  31.16%  0.00%  0.00%  98.32%  31.16%   a.out           a.out  [.] foo
> >
> > I think you could switch to/from each of these forms using a hotkey,
> > that would influence how the hist_entry__snprintf() routine would work,
> > either using perf_evsel__name() or evsel->idx :-)
> >
> > This way if at some point the user wants to expand/compress the lines,
> > it will be possible to do so quickly, just pressing the hotkey.
> 
> By saying hotkey, I guess you meant to use it for TUI.  However TUI
> doesn't provide those header lines. ;-)

See? I was trying to hit two rabbits with one stone, but you realised
that...

> As this extra line (and hotkey) thing might add complexity to the
> patchset, I'd like to separate it to a different work and to focus on
> the basic feature with current behavior.  Is it acceptable for you?

Sure thing.

- Arnaldo
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