perf tools: Save callchain info for each cumulative entry

When accumulating callchain entry, also save current snapshot of the
chain so that it can show the rest of the chain.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arun Sharma <asharma@fb.com>
Tested-by: Rodrigo Campos <rodrigo@sdfg.com.ar>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1401335910-16832-10-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

1 files changed, 14 insertions, 2 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index bf03db528db6..c6f5f5251aad 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -738,6 +738,14 @@ iter_add_single_cumulative_entry(struct hist_entry_iter *iter,
         iter->he = he;
         he_cache[iter->curr++] = he;
 
+        callchain_append(he->callchain, &callchain_cursor, sample->period);
+
+        /*
+         * We need to re-initialize the cursor since callchain_append()
+         * advanced the cursor to the end.
+         */
+        callchain_cursor_commit(&callchain_cursor);
+
         /*
          * The iter->he will be over-written after ->add_next_entry()
          * called so inc stats for the original entry now.
@@ -760,8 +768,6 @@ iter_next_cumulative_entry(struct hist_entry_iter *iter,
         if (node == NULL)
                 return 0;
 
-        callchain_cursor_advance(&callchain_cursor);
-
         return fill_callchain_info(al, node, iter->hide_unresolved);
 }
 
@@ -785,6 +791,11 @@ iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
                 .parent = iter->parent,
         };
         int i;
+        struct callchain_cursor cursor;
+
+        callchain_cursor_snapshot(&cursor, &callchain_cursor);
+
+        callchain_cursor_advance(&callchain_cursor);
 
         /*
          * Check if there's duplicate entries in the callchain.
@@ -804,6 +815,7 @@ iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
         iter->he = he;
         he_cache[iter->curr++] = he;
 
+        callchain_append(he->callchain, &cursor, sample->period);
         return 0;
 }