3 files changed, 54 insertions, 5 deletions
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 1b5a5990dddb..a4413d983216 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -391,6 +391,52 @@ static void hist_entry__init_have_children(struct hist_entry *he)
 	he->init_have_children = true;
 }
 
+static bool hist_browser__selection_has_children(struct hist_browser *browser)
+{
+	struct hist_entry *he = browser->he_selection;
+	struct map_symbol *ms = browser->selection;
+
+	if (!he || !ms)
+		return false;
+
+	if (ms == &he->ms)
+	       return he->has_children;
+
+	return container_of(ms, struct callchain_list, ms)->has_children;
+}
+
+static bool hist_browser__selection_unfolded(struct hist_browser *browser)
+{
+	struct hist_entry *he = browser->he_selection;
+	struct map_symbol *ms = browser->selection;
+
+	if (!he || !ms)
+		return false;
+
+	if (ms == &he->ms)
+	       return he->unfolded;
+
+	return container_of(ms, struct callchain_list, ms)->unfolded;
+}
+
+static char *hist_browser__selection_sym_name(struct hist_browser *browser, char *bf, size_t size)
+{
+	struct hist_entry *he = browser->he_selection;
+	struct map_symbol *ms = browser->selection;
+	struct callchain_list *callchain_entry;
+
+	if (!he || !ms)
+		return NULL;
+
+	if (ms == &he->ms) {
+	       hist_entry__sym_snprintf(he, bf, size, 0);
+	       return bf + 4; // skip the level, e.g. '[k] '
+	}
+
+	callchain_entry = container_of(ms, struct callchain_list, ms);
+	return callchain_list__sym_name(callchain_entry, bf, size, browser->show_dso);
+}
+
 static bool hist_browser__toggle_fold(struct hist_browser *browser)
 {
 	struct hist_entry *he = browser->he_selection;
@@ -2535,12 +2581,14 @@ static int do_toggle_callchain(struct hist_browser *browser, struct popup_action
 
 static int add_callchain_toggle_opt(struct hist_browser *browser, struct popup_action *act, char **optstr)
 {
-	struct hist_entry *he = browser->he_selection;
+	char sym_name[512];
 
-        if (!he->has_children)
+        if (!hist_browser__selection_has_children(browser))
                 return 0;
 
-	if (asprintf(optstr, "Expand/Collapse callchain") < 0)
+	if (asprintf(optstr, "%s [%s] callchain (one level, same as '+' hotkey, use 'e'/'c' for the whole main level entry)",
+		     hist_browser__selection_unfolded(browser) ? "Collapse" : "Expand",
+		     hist_browser__selection_sym_name(browser, sym_name, sizeof(sym_name))) < 0)
 		return 0;
 
 	act->fn = do_toggle_callchain;
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 9fcba2872130..ab0cfd790ad0 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -324,8 +324,7 @@ static int _hist_entry__sym_snprintf(struct map_symbol *ms,
 	return ret;
 }
 
-static int hist_entry__sym_snprintf(struct hist_entry *he, char *bf,
-				    size_t size, unsigned int width)
+int hist_entry__sym_snprintf(struct hist_entry *he, char *bf, size_t size, unsigned int width)
 {
 	return _hist_entry__sym_snprintf(&he->ms, he->ip,
 					 he->level, bf, size, width);
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 5aff9542d9b7..6c862d62d052 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -164,6 +164,8 @@ static __pure inline bool hist_entry__has_callchains(struct hist_entry *he)
 	return he->callchain_size != 0;
 }
 
+int hist_entry__sym_snprintf(struct hist_entry *he, char *bf, size_t size, unsigned int width);
+
 static inline bool hist_entry__has_pairs(struct hist_entry *he)
 {
 	return !list_empty(&he->pairs.node);