perf annotate browser: Display titles in left frame

The annotate browser is divided into 2 frames. Left frame contains 3
columns (some platforms only have one column).

For example:

                   │26  int compute_flag()
                   │27  {
 22.80  1.20       │      sub    $0x8,%rsp
                   │25          int i;
                   │
                   │27          i = rand() % 2;
 22.78  1.20     1 │    → callq  rand@plt

While it's hard for user to understand what the data is.

This patch adds the titles "Percent", "IPC" and "Cycle" on columns.

Percent  IPC Cycle │
                   │25  __attribute__((noinline))
                   │26  int compute_flag()
                   │27  {
 22.80  1.20       │      sub    $0x8,%rsp
                   │25          int i;
                   │
                   │27          i = rand() % 2;
 22.78  1.20     1 │    → callq  rand@plt

The titles are displayed at row 0 of annotate browser if row 0 doesn't
have values of percent, ipc and cycle.

Signed-off-by: Yao Jin <yao.jin@linux.intel.com>
Acked-by: Milian Wolff <milian.wolff@kdab.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Yao Jin <yao.jin@linux.intel.com>
Link: http://lkml.kernel.org/r/1493909895-9668-3-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 21 insertions, 3 deletions

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 52c1e8d672b5..7a03389b7a03 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -125,12 +125,21 @@ static void annotate_browser__write(struct ui_browser *browser, void *entry, int
         int i, pcnt_width = annotate_browser__pcnt_width(ab);
         double percent_max = 0.0;
         char bf[256];
+        bool show_title = false;
 
         for (i = 0; i < ab->nr_events; i++) {
                 if (bdl->samples[i].percent > percent_max)
                         percent_max = bdl->samples[i].percent;
         }
 
+        if ((row == 0) && (dl->offset == -1 || percent_max == 0.0)) {
+                if (ab->have_cycles) {
+                        if (dl->ipc == 0.0 && dl->cycles == 0)
+                                show_title = true;
+                } else
+                        show_title = true;
+        }
+
         if (dl->offset != -1 && percent_max != 0.0) {
                 for (i = 0; i < ab->nr_events; i++) {
                         ui_browser__set_percent_color(browser,
@@ -146,18 +155,27 @@ static void annotate_browser__write(struct ui_browser *browser, void *entry, int
                 }
         } else {
                 ui_browser__set_percent_color(browser, 0, current_entry);
-                ui_browser__write_nstring(browser, " ", 7 * ab->nr_events);
+
+                if (!show_title)
+                        ui_browser__write_nstring(browser, " ", 7 * ab->nr_events);
+                else
+                        ui_browser__printf(browser, "%*s", 7, "Percent");
         }
         if (ab->have_cycles) {
                 if (dl->ipc)
                         ui_browser__printf(browser, "%*.2f ", IPC_WIDTH - 1, dl->ipc);
-                else
+                else if (!show_title)
                         ui_browser__write_nstring(browser, " ", IPC_WIDTH);
+                else
+                        ui_browser__printf(browser, "%*s ", IPC_WIDTH - 1, "IPC");
+
                 if (dl->cycles)
                         ui_browser__printf(browser, "%*" PRIu64 " ",
                                            CYCLES_WIDTH - 1, dl->cycles);
-                else
+                else if (!show_title)
                         ui_browser__write_nstring(browser, " ", CYCLES_WIDTH);
+                else
+                        ui_browser__printf(browser, "%*s ", CYCLES_WIDTH - 1, "Cycle");
         }
 
         SLsmg_write_char(' ');