[PATCH] perf top: Add a visual cue for toggle zeroing of samples

[Taeung Song <treeze.taeung@gmail.com>]

When 'perf top' is run, one can't easily find a difference
between -z option and normal output.
So I added a visual cue to know whether it is the zeroing or not.

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
 tools/perf/ui/browsers/hists.c | 38 ++++++++++++++++++++++++++------------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 8f60a97..be49363 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -35,7 +35,9 @@ struct hist_browser {
 
 extern void hist_browser__init_hpp(void);
 
-static int hists__browser_title(struct hists *hists, char *bf, size_t size);
+static int hists__browser_title(struct hists *hists,
+				struct hist_browser_timer *hbt,
+				char *bf, size_t size);
 static void hist_browser__update_nr_entries(struct hist_browser *hb);
 
 static struct rb_node *hists__filter_entries(struct rb_node *nd,
@@ -390,7 +392,7 @@ static int hist_browser__run(struct hist_browser *browser,
 	browser->b.entries = &browser->hists->entries;
 	browser->b.nr_entries = hist_browser__nr_entries(browser);
 
-	hists__browser_title(browser->hists, title, sizeof(title));
+	hists__browser_title(browser->hists, hbt, title, sizeof(title));
 
 	if (ui_browser__show(&browser->b, title,
 			     "Press '?' for help on key bindings") < 0)
@@ -417,7 +419,8 @@ static int hist_browser__run(struct hist_browser *browser,
 				ui_browser__warn_lost_events(&browser->b);
 			}
 
-			hists__browser_title(browser->hists, title, sizeof(title));
+			hists__browser_title(browser->hists,
+					     hbt, title, sizeof(title));
 			ui_browser__show_title(&browser->b, title);
 			continue;
 		}
@@ -1204,7 +1207,16 @@ static struct thread *hist_browser__selected_thread(struct hist_browser *browser
 	return browser->he_selection->thread;
 }
 
-static int hists__browser_title(struct hists *hists, char *bf, size_t size)
+/* Check whether the browser is for 'top' or 'report' */
+static inline bool is_report_browser(void *timer)
+{
+	return timer == NULL;
+}
+
+static int hists__browser_title(struct hists *hists,
+				struct hist_browser_timer *hbt,
+				char *bf,
+				size_t size)
 {
 	char unit;
 	int printed;
@@ -1241,7 +1253,7 @@ static int hists__browser_title(struct hists *hists, char *bf, size_t size)
 
 	nr_samples = convert_unit(nr_samples, &unit);
 	printed = scnprintf(bf, size,
-			   "Samples: %lu%c of event '%s', Event count (approx.): %lu",
+			   "Samples: %lu%c of event z'%s', Event count (approx.): %lu",
 			   nr_samples, unit, ev_name, nr_events);
 
 
@@ -1255,7 +1267,15 @@ static int hists__browser_title(struct hists *hists, char *bf, size_t size)
 				    thread->tid);
 	if (dso)
 		printed += scnprintf(bf + printed, size - printed,
-				    ", DSO: %s", dso->short_name);
+				     ", DSO: %s", dso->short_name);
+	if (!is_report_browser(hbt)) {
+		struct perf_top *top = hbt->arg;
+
+		if (top->zero)
+			printed += scnprintf(bf + printed, size - printed,
+					     ", [z]", "");
+	}
+
 	return printed;
 }
 
@@ -1267,12 +1287,6 @@ static inline void free_popup_options(char **options, int n)
 		zfree(&options[i]);
 }
 
-/* Check whether the browser is for 'top' or 'report' */
-static inline bool is_report_browser(void *timer)
-{
-	return timer == NULL;
-}
-
 /*
  * Only runtime switching of perf data file will make "input_name" point
  * to a malloced buffer. So add "is_input_name_malloced" flag to decide
-- 
1.9.1