perf annotate: Display the branch counter histogram

Display the branch counter histogram in the annotation view.

Press 'B' to display the branch counter's abbreviation list as well.

  Samples: 1M of events 'anon group { branch-instructions:ppp, branch-misses }',
  4000 Hz, Event count (approx.):
  f3  /home/sdp/test/tchain_edit [Percent: local period]
  Percent       │ IPC Cycle       Branch Counter (Average IPC: 1.39, IPC Coverage: 29.4%)
                │                                     0000000000401755 <f3>:
    0.00   0.00 │                                       endbr64
                │                                       push    %rbp
                │                                       mov     %rsp,%rbp
                │                                       movl    $0x0,-0x4(%rbp)
    0.00   0.00 │1.33     3          |A   |-   |      ↓ jmp     25
   11.03  11.03 │                                 11:   mov     -0x4(%rbp),%eax
                │                                       and     $0x1,%eax
                │                                       test    %eax,%eax
   17.13  17.13 │2.41     1          |A   |-   |      ↓ je      21
                │                                       addl    $0x1,-0x4(%rbp)
   21.84  21.84 │2.22     2          |AA  |-   |      ↓ jmp     25
   17.13  17.13 │                                 21:   addl    $0x1,-0x4(%rbp)
   21.84  21.84 │                                 25:   cmpl    $0x270f,-0x4(%rbp)
   11.03  11.03 │0.61     3          |A   |-   |      ↑ jle     11
                │                                       nop
                │                                       pop     %rbp
    0.00   0.00 │0.24    20          |AA  |B   |      ← ret

Originally-by: Tinghao Zhang <tinghao.zhang@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20240813160208.2493643-8-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 16 insertions, 2 deletions

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index fe991a81256b..d7e727345dab 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -156,6 +156,7 @@ static void annotate_browser__draw_current_jump(struct ui_browser *browser)
 	struct symbol *sym = ms->sym;
 	struct annotation *notes = symbol__annotation(sym);
 	u8 pcnt_width = annotation__pcnt_width(notes);
+	u8 cntr_width = annotation__br_cntr_width();
 	int width;
 	int diff = 0;
 
@@ -205,13 +206,13 @@ static void annotate_browser__draw_current_jump(struct ui_browser *browser)
 
 	ui_browser__set_color(browser, HE_COLORSET_JUMP_ARROWS);
 	__ui_browser__line_arrow(browser,
-				 pcnt_width + 2 + notes->src->widths.addr + width,
+				 pcnt_width + 2 + notes->src->widths.addr + width + cntr_width,
 				 from, to);
 
 	diff = is_fused(ab, cursor);
 	if (diff > 0) {
 		ui_browser__mark_fused(browser,
-				       pcnt_width + 3 + notes->src->widths.addr + width,
+				       pcnt_width + 3 + notes->src->widths.addr + width + cntr_width,
 				       from - diff, diff, to > from);
 	}
 }
@@ -714,6 +715,7 @@ static int annotate_browser__run(struct annotate_browser *browser,
 	struct annotation *notes = symbol__annotation(ms->sym);
 	const char *help = "Press 'h' for help on key bindings";
 	int delay_secs = hbt ? hbt->refresh : 0;
+	char *br_cntr_text = NULL;
 	char title[256];
 	int key;
 
@@ -730,6 +732,8 @@ static int annotate_browser__run(struct annotate_browser *browser,
 
 	nd = browser->curr_hot;
 
+	annotation_br_cntr_abbr_list(&br_cntr_text, evsel, false);
+
 	while (1) {
 		key = ui_browser__run(&browser->b, delay_secs);
 
@@ -796,6 +800,7 @@ static int annotate_browser__run(struct annotate_browser *browser,
 		"r             Run available scripts\n"
 		"p             Toggle percent type [local/global]\n"
 		"b             Toggle percent base [period/hits]\n"
+		"B             Branch counter abbr list (Optional)\n"
 		"?             Search string backwards\n"
 		"f             Toggle showing offsets to full address\n");
 			continue;
@@ -904,6 +909,14 @@ show_sup_ins:
 			hists__scnprintf_title(hists, title, sizeof(title));
 			annotate_browser__show(&browser->b, title, help);
 			continue;
+		case 'B':
+			if (br_cntr_text)
+				ui_browser__help_window(&browser->b, br_cntr_text);
+			else {
+				ui_browser__help_window(&browser->b,
+							"\n The branch counter is not available.\n");
+			}
+			continue;
 		case 'f':
 			annotation__toggle_full_addr(notes, ms);
 			continue;
@@ -923,6 +936,7 @@ show_sup_ins:
 	}
 out:
 	ui_browser__hide(&browser->b);
+	free(br_cntr_text);
 	return key;
 }