perf report: Add callchain value option

Now -g/--call-graph option supports how to display callchain values.
Possible values are 'percent', 'period' and 'count'.  The percent is
same as before and it's the default behavior.  The period displays the
raw period value rather than the percentage.  The count displays the
number of occurrences.

  $ perf report --no-children --stdio -g percent
  ...
    39.93%  swapper  [kernel.vmlinux]  [k] intel_idel
            |
            ---intel_idle
               cpuidle_enter_state
               cpuidle_enter
               call_cpuidle
               cpu_startup_entry
               |
               |--28.63%-- start_secondary
               |
                --11.30%-- rest_init

  $ perf report --no-children --show-total-period --stdio -g period
  ...
    39.93%   13018705  swapper  [kernel.vmlinux]  [k] intel_idel
            |
            ---intel_idle
               cpuidle_enter_state
               cpuidle_enter
               call_cpuidle
               cpu_startup_entry
               |
               |--9334403-- start_secondary
               |
                --3684302-- rest_init

  $ perf report --no-children --show-nr-samples --stdio -g count
  ...
    39.93%     80  swapper  [kernel.vmlinux]  [k] intel_idel
            |
            ---intel_idle
               cpuidle_enter_state
               cpuidle_enter
               call_cpuidle
               cpu_startup_entry
               |
               |--57-- start_secondary
               |
                --23-- rest_init

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1447047946-1691-6-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index f4de055cab9b..7ebc661be267 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -81,13 +81,14 @@ static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root,
                                          int depth_mask, int left_margin)
 {
         struct rb_node *node, *next;
-        struct callchain_node *child;
+        struct callchain_node *child = NULL;
         struct callchain_list *chain;
         int new_depth_mask = depth_mask;
         u64 remaining;
         size_t ret = 0;
         int i;
         uint entries_printed = 0;
+        int cumul_count = 0;
 
         remaining = total_samples;
 
@@ -99,6 +100,7 @@ static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root,
                 child = rb_entry(node, struct callchain_node, rb_node);
                 cumul = callchain_cumul_hits(child);
                 remaining -= cumul;
+                cumul_count += callchain_cumul_counts(child);
 
                 /*
                  * The depth mask manages the output of pipes that show
@@ -148,6 +150,12 @@ static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root,
                 if (!rem_sq_bracket)
                         return ret;
 
+                if (callchain_param.value == CCVAL_COUNT && child && child->parent) {
+                        rem_node.count = child->parent->children_count - cumul_count;
+                        if (rem_node.count <= 0)
+                                return ret;
+                }
+
                 new_depth_mask &= ~(1 << (depth - 1));
                 ret += ipchain__fprintf_graph(fp, &rem_node, &rem_hits, depth,
                                               new_depth_mask, 0, total_samples,