[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/PERF-FEATURES       |  1 +
 tools/perf/ui/browsers/hists.c | 34 ++++++++++++++++++++++++----------
 2 files changed, 25 insertions(+), 10 deletions(-)
 create mode 100644 tools/perf/PERF-FEATURES

diff --git a/tools/perf/PERF-FEATURES b/tools/perf/PERF-FEATURES
new file mode 100644
index 0000000..bf2723d
--- /dev/null
+++ b/tools/perf/PERF-FEATURES
@@ -0,0 +1 @@
+feature-dwarf(1) feature-glibc(1) feature-gtk2(0) feature-libaudit(1) feature-libbfd(0) feature-libelf(1) feature-libnuma(1) feature-libperl(1) feature-libpython(0) feature-libslang(1) feature-libunwind(1) feature-libdw-dwarf-unwind(1) dwarf-post-unwind(libunwind)
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 8f60a97..6af157c 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;
@@ -1256,6 +1268,14 @@ static int hists__browser_title(struct hists *hists, char *bf, size_t size)
 	if (dso)
 		printed += scnprintf(bf + printed, size - printed,
 				    ", 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