perf gtk/hists: Add support for callchains

Display callchain information in the symbol column.  It's only enabled
when recorded with -g and has symbol sort key.

Reviewed-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1370337737-30812-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/tools/perf/ui/gtk/hists.c b/tools/perf/ui/gtk/hists.c
index cb6a9b45f789..226c7e10f3cc 100644
--- a/tools/perf/ui/gtk/hists.c
+++ b/tools/perf/ui/gtk/hists.c
@@ -124,6 +124,55 @@ void perf_gtk__init_hpp(void)
                                 perf_gtk__hpp_color_overhead_guest_us;
 }
 
+static void callchain_list__sym_name(struct callchain_list *cl,
+                                     char *bf, size_t bfsize)
+{
+        if (cl->ms.sym)
+                scnprintf(bf, bfsize, "%s", cl->ms.sym->name);
+        else
+                scnprintf(bf, bfsize, "%#" PRIx64, cl->ip);
+}
+
+static void perf_gtk__add_callchain(struct rb_root *root, GtkTreeStore *store,
+                                    GtkTreeIter *parent, int col)
+{
+        struct rb_node *nd;
+        bool has_single_node = (rb_first(root) == rb_last(root));
+
+        for (nd = rb_first(root); nd; nd = rb_next(nd)) {
+                struct callchain_node *node;
+                struct callchain_list *chain;
+                GtkTreeIter iter, new_parent;
+                bool need_new_parent;
+
+                node = rb_entry(nd, struct callchain_node, rb_node);
+
+                new_parent = *parent;
+                need_new_parent = !has_single_node && (node->val_nr > 1);
+
+                list_for_each_entry(chain, &node->val, list) {
+                        char buf[128];
+
+                        gtk_tree_store_append(store, &iter, &new_parent);
+
+                        callchain_list__sym_name(chain, buf, sizeof(buf));
+                        gtk_tree_store_set(store, &iter, col, buf, -1);
+
+                        if (need_new_parent) {
+                                /*
+                                 * Only show the top-most symbol in a callchain
+                                 * if it's not the only callchain.
+                                 */
+                                new_parent = iter;
+                                need_new_parent = false;
+                        }
+                }
+
+                /* Now 'iter' contains info of the last callchain_list */
+                perf_gtk__add_callchain(&node->rb_root, store, &iter, col);
+        }
+}
+
 static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
                                  float min_pcnt)
 {
@@ -135,6 +184,7 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
         struct rb_node *nd;
         GtkWidget *view;
         int col_idx;
+        int sym_col = -1;
         int nr_cols;
         char s[512];
 
@@ -153,6 +203,9 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
                 if (se->elide)
                         continue;
 
+                if (se == &sort_sym)
+                        sym_col = nr_cols;
+
                 col_types[nr_cols++] = G_TYPE_STRING;
         }
 
@@ -183,6 +236,13 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
                                                             col_idx++, NULL);
         }
 
+        if (symbol_conf.use_callchain && sort__has_sym) {
+                GtkTreeViewColumn *column;
+
+                column = gtk_tree_view_get_column(GTK_TREE_VIEW(view), sym_col);
+                gtk_tree_view_set_expander_column(GTK_TREE_VIEW(view), column);
+        }
+
         gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(store));
 
         g_object_unref(GTK_TREE_MODEL(store));
@@ -221,6 +281,11 @@ static void perf_gtk__show_hists(GtkWidget *window, struct hists *hists,
 
                         gtk_tree_store_set(store, &iter, col_idx++, s, -1);
                 }
+
+                if (symbol_conf.use_callchain && sort__has_sym) {
+                        perf_gtk__add_callchain(&h->sorted_chain, store, &iter,
+                                                sym_col);
+                }
         }
 
         gtk_container_add(GTK_CONTAINER(window), view);