perf report: Add suppport for event group view (v2)

Hi,

This is my second attempt to support event group on perf report.
For basic idea and usage example, please see my original post [1].

The main difference than v1 is adding HEADER_GROUP_DESC feature and
use it for regenerating group relationship on perf report.  It will
save actual (i.e. contains non-leader member) group information to
perf header.

Patch 1 is a bug fix which can be applied indenpedently.

Patch 2-4 are cleanups to facilitate later changes and came from my
cumulative report series [2].

You can also access it via my tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git  perf/group-v2

Any comments are welcome, thanks,
Namhyung

v1 -> v2:
 * save group relation to header (Jiri)
 * rebase on top of current acme/perf/core


[1] https://lkml.org/lkml/2012/7/24/81
[2] https://lkml.org/lkml/2012/9/13/81

Namhyung Kim (16):
  perf hists: Add missing period_* fields when collapsing a hist entry
  perf hists: Introduce struct he_stat
  perf hists: Move he->stat.nr_events initialization to a template
  perf hists: Add more helpers for hist entry stat
  perf tools: Keep group information
  perf evlist: Add perf_evlist__recalc_nr_groups
  perf header: Add HEADER_GROUP_DESC feature
  perf hists: Collapse group hist_entries to a leader
  perf hists: Maintain total periods of group members in the leader
  perf report: Make another loop for output resorting
  perf ui/hist: Add support for event group view
  perf ui/browser: Add support for event group view
  perf ui/gtk: Add support for event group view
  perf report: Bypass non-leader events when event group is enabled
  perf report: Show group description when event group is enabled
  perf report: Add --group option

 tools/perf/builtin-record.c    |   6 ++
 tools/perf/builtin-report.c    |  29 +++++++
 tools/perf/ui/browsers/hists.c | 107 ++++++++++++++++++++---
 tools/perf/ui/gtk/browser.c    |  70 ++++++++++++---
 tools/perf/ui/hist.c           | 104 +++++++++++++++++------
 tools/perf/ui/stdio/hist.c     |   4 +-
 tools/perf/util/evlist.c       |  26 +++++-
 tools/perf/util/evlist.h       |   2 +
 tools/perf/util/evsel.c        |  25 ++++++
 tools/perf/util/evsel.h        |  23 +++++
 tools/perf/util/header.c       | 149 ++++++++++++++++++++++++++++++++
 tools/perf/util/header.h       |   2 +
 tools/perf/util/hist.c         | 188 +++++++++++++++++++++++++++++++++++------
 tools/perf/util/hist.h         |   2 +
 tools/perf/util/parse-events.c |   1 +
 tools/perf/util/parse-events.h |   1 +
 tools/perf/util/parse-events.y |   4 +
 tools/perf/util/sort.h         |  17 ++--
 tools/perf/util/symbol.c       |   4 +
 tools/perf/util/symbol.h       |   3 +-
 20 files changed, 683 insertions(+), 84 deletions(-)

-- 
1.7.11.4

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