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

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Date:	Wed, 16 Jan 2013 15:28:59 -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 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.

- Arnaldo
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