perf tools: Add support for hierachy view (v4)

Hello,

This is v4 attempt of my earlier patchset [1].  This patchset
implements a new feature that collects hist entries in a hierachical
manner.  That means lower-level entries belong to an upper-level
entry.  The entry hierachy is built on the sort keys given, so users
can set it whatever they want.  It only shows top-level entries first,
and user can expand/collapse it dynamically.

The patch 01 to 07 are resend and got Ack's from Jiri [2].

 * Changes from v3)
  - rebased onto the percent limit patchset v2

 * Changes from v2)
  - check memory allocation failure in hists__hierarchy_insert_entry  (Jiri)
  - remove unused rb_hierarchy_first()  (Arnaldo)
  - support callchain percent limit  (Andi)
  - break TUI context menu cleanup  (Arnaldo)
  

This time I implemented it for every output browser including TUI.
A screenshot on TUI looks like below:

For normal output:

  $ perf report --tui
  Samples: 3K of event 'cycles:pp', Event count (approx.): 1695979674
    Overhead  Command        Shared Object         Symbol
  ------------------------------------------------------------------------
  -    7.57%  swapper        [kernel.vmlinux]      [k] intel_idle
       intel_idle
       cpuidle_enter_state
       cpuidle_enter
       call_cpuidle
     + cpu_startup_entry
  +    1.16   firefox        firefox               [.] 0x00000000000019433
  +    0.97%  firefox        libpthread-2.22.so    [.] pthread_mutex_lock
  ...


With hierarchy view,

  $ perf report --tui --hierarchy
  Samples: 3K of event 'cycles:pp', Event count (approx.): 1695979674
   Overhead        Command / Shared Object / Symbol
  -------------------------------------------------------------------
  +  76.30%        firefox
  -   9.95%        swapper
     -   9.51%        [kernel.vmlinux]
        -   7.57         [k] intel_idle
	     intel_idle
	     cpuidle_enter_state
	     cpuidle_enter
	     call_cpuidle
	   + cpu_startup_entry
	+   0.15%        [k] __schedule
	+   0.12%        [k] menu_select
	...
     +   0.34%        [sdhci]
     +   0.06%        [e1000e]
     ...
 +    5.65%        Xorg
 +    5.42%        Socket Thread
 ...

As you can see, overhead of an upper level entry is the sum of
overhead of lower level entries.  The entries are aligned by its order
of matching sort keys.

This is available from 'perf/hierarchy-v4' branch in my tree:

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


Any comments are welcome, thanks!
Namhyung


Cc: Don Zickus <dzickus@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Moinuddin Quadri <moin18@gmail.com>


[1] https://lkml.org/lkml/2013/5/21/24
[2] http://lkml.iu.edu/hypermail/linux/kernel/1601.2/04245.html


Namhyung Kim (21):
  perf callchain: Check return value of add_child()
  perf callchain: Check return value of fill_node()
  perf callchain: Add enum match_result for match_chain()
  perf callchain: Check return value of split_add_child()
  perf callchain: Check return value of append_chain_children()
  perf hists: Return error from hists__collapse_resort()
  perf report: Check error during report__collapse_hists()
  perf hists: Basic support of hierarchical report view
  perf hists: Resort hist entries with hierarchy
  perf hists: Add helper functions for hierarchy mode
  perf hists: Support filtering in hierarchy mode
  perf ui/stdio: Implement hierarchy output mode
  perf ui/stdio: Align column header for hierarchy output
  perf hists browser: Count number of hierarchy entries
  perf hists browser: Support collapsing/expanding whole entries in
    hierarchy
  perf hists browser: Implement hierarchy output
  perf hists browser: Align column header in hierarchy mode
  perf ui/gtk: Implement hierarchy output mode
  perf report: Add --hierarchy option
  perf hists: Support decaying in hierarchy mode
  perf top: Add --hierarchy option

 tools/perf/Documentation/perf-report.txt |   3 +
 tools/perf/Documentation/perf-top.txt    |   3 +
 tools/perf/Documentation/tips.txt        |   1 +
 tools/perf/builtin-report.c              |  31 +-
 tools/perf/builtin-top.c                 |  15 +
 tools/perf/ui/browsers/hists.c           | 470 ++++++++++++++++++++++++++++---
 tools/perf/ui/gtk/hists.c                | 161 ++++++++++-
 tools/perf/ui/hist.c                     |  14 +
 tools/perf/ui/stdio/hist.c               | 184 +++++++++++-
 tools/perf/util/callchain.c              | 102 +++++--
 tools/perf/util/hist.c                   | 421 +++++++++++++++++++++++++--
 tools/perf/util/hist.h                   |  14 +-
 tools/perf/util/sort.c                   | 113 ++++++++
 tools/perf/util/sort.h                   |  14 +-
 tools/perf/util/symbol.h                 |   3 +-
 15 files changed, 1444 insertions(+), 105 deletions(-)

-- 
2.6.4