perf top: Live TUI Annotation

Now one has just to press the right key, 'a' or Enter on the main 'perf
top --tui' screen to live annotate the symbol under the cursor.

The annotate window starts centered on the hottest line (the one with
most samples so far) then TAB and shift+TAB can be used to go to the
prev/next hot line.

Pressing 'H' at any point will center again the screen on the hottest
line.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 90 insertions, 36 deletions

diff --git a/tools/perf/util/ui/browsers/annotate.c b/tools/perf/util/ui/browsers/annotate.c
index cfb5a27f15d2..8c17a8730e4a 100644
--- a/tools/perf/util/ui/browsers/annotate.c
+++ b/tools/perf/util/ui/browsers/annotate.c
@@ -6,6 +6,7 @@
 #include "../../sort.h"
 #include "../../symbol.h"
 #include "../../annotate.h"
+#include <pthread.h>
 
 static void ui__error_window(const char *fmt, ...)
 {
@@ -138,46 +139,108 @@ static void annotate_browser__set_top(struct annotate_browser *self,
 	self->curr_hot = nd;
 }
 
-static int annotate_browser__run(struct annotate_browser *self)
+static void annotate_browser__calc_percent(struct annotate_browser *browser,
+					   int evidx)
 {
-	struct rb_node *nd;
+	struct symbol *sym = browser->b.priv;
+	struct annotation *notes = symbol__annotation(sym);
+	struct objdump_line *pos;
+
+	browser->entries = RB_ROOT;
+
+	pthread_mutex_lock(&notes->lock);
+
+	list_for_each_entry(pos, &notes->src->source, node) {
+		struct objdump_line_rb_node *rbpos = objdump_line__rb(pos);
+		rbpos->percent = objdump_line__calc_percent(pos, sym, evidx);
+		if (rbpos->percent < 0.01) {
+			RB_CLEAR_NODE(&rbpos->rb_node);
+			continue;
+		}
+		objdump__insert_line(&browser->entries, rbpos);
+	}
+	pthread_mutex_unlock(&notes->lock);
+
+	browser->curr_hot = rb_last(&browser->entries);
+}
+
+static int annotate_browser__run(struct annotate_browser *self, int evidx,
+				 int refresh)
+{
+	struct rb_node *nd = NULL;
 	struct symbol *sym = self->b.priv;
+	/*
+	 * RIGHT To allow builtin-annotate to cycle thru multiple symbols by
+	 * examining the exit key for this function.
+	 */
+	int exit_keys[] = { 'H', NEWT_KEY_TAB, NEWT_KEY_UNTAB,
+			    NEWT_KEY_RIGHT, 0 };
 	int key;
 
 	if (ui_browser__show(&self->b, sym->name,
-			     "<-, -> or ESC: exit, TAB/shift+TAB: cycle thru samples") < 0)
+			     "<-, -> or ESC: exit, TAB/shift+TAB: "
+			     "cycle hottest lines, H: Hottest") < 0)
 		return -1;
-	/*
-	 * To allow builtin-annotate to cycle thru multiple symbols by
-	 * examining the exit key for this function.
-	 */
-	ui_browser__add_exit_key(&self->b, NEWT_KEY_RIGHT);
+
+	ui_browser__add_exit_keys(&self->b, exit_keys);
+	annotate_browser__calc_percent(self, evidx);
+
+	if (self->curr_hot)
+		annotate_browser__set_top(self, self->curr_hot);
 
 	nd = self->curr_hot;
-	if (nd) {
-		int tabs[] = { NEWT_KEY_TAB, NEWT_KEY_UNTAB, 0 };
-		ui_browser__add_exit_keys(&self->b, tabs);
-	}
+
+	if (refresh != 0)
+		newtFormSetTimer(self->b.form, refresh);
 
 	while (1) {
 		key = ui_browser__run(&self->b);
 
+		if (refresh != 0) {
+			annotate_browser__calc_percent(self, evidx);
+			/*
+			 * Current line focus got out of the list of most active
+			 * lines, NULL it so that if TAB|UNTAB is pressed, we
+			 * move to curr_hot (current hottest line).
+			 */
+			if (nd != NULL && RB_EMPTY_NODE(nd))
+				nd = NULL;
+		}
+
 		switch (key) {
+		case -1:
+			/*
+ 			 * FIXME we need to check if it was
+ 			 * es.reason == NEWT_EXIT_TIMER
+ 			 */
+			if (refresh != 0)
+				symbol__annotate_decay_histogram(sym, evidx);
+			continue;
 		case NEWT_KEY_TAB:
-			nd = rb_prev(nd);
-			if (nd == NULL)
-				nd = rb_last(&self->entries);
-			annotate_browser__set_top(self, nd);
+			if (nd != NULL) {
+				nd = rb_prev(nd);
+				if (nd == NULL)
+					nd = rb_last(&self->entries);
+			} else
+				nd = self->curr_hot;
 			break;
 		case NEWT_KEY_UNTAB:
-			nd = rb_next(nd);
-			if (nd == NULL)
-				nd = rb_first(&self->entries);
-			annotate_browser__set_top(self, nd);
+			if (nd != NULL)
+				nd = rb_next(nd);
+				if (nd == NULL)
+					nd = rb_first(&self->entries);
+			else
+				nd = self->curr_hot;
+			break;
+		case 'H':
+			nd = self->curr_hot;
 			break;
 		default:
 			goto out;
 		}
+
+		if (nd != NULL)
+			annotate_browser__set_top(self, nd);
 	}
 out:
 	ui_browser__hide(&self->b);
@@ -186,13 +249,13 @@ out:
 
 int hist_entry__tui_annotate(struct hist_entry *he, int evidx)
 {
-	return symbol__tui_annotate(he->ms.sym, he->ms.map, evidx);
+	return symbol__tui_annotate(he->ms.sym, he->ms.map, evidx, 0);
 }
 
-int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx)
+int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
+			 int refresh)
 {
 	struct objdump_line *pos, *n;
-	struct objdump_line_rb_node *rbpos;
 	struct annotation *notes = symbol__annotation(sym);
 	struct annotate_browser browser = {
 		.b = {
@@ -211,7 +274,7 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx)
 	if (map->dso->annotate_warned)
 		return -1;
 
-	if (symbol__annotate(sym, map, sizeof(*rbpos)) < 0) {
+	if (symbol__annotate(sym, map, sizeof(struct objdump_line_rb_node)) < 0) {
 		ui__error_window(ui_helpline__last_msg);
 		return -1;
 	}
@@ -219,26 +282,17 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx)
 	ui_helpline__push("Press <- or ESC to exit");
 
 	list_for_each_entry(pos, &notes->src->source, node) {
+		struct objdump_line_rb_node *rbpos;
 		size_t line_len = strlen(pos->line);
+
 		if (browser.b.width < line_len)
 			browser.b.width = line_len;
 		rbpos = objdump_line__rb(pos);
 		rbpos->idx = browser.b.nr_entries++;
-		rbpos->percent = objdump_line__calc_percent(pos, sym, evidx);
-		if (rbpos->percent < 0.01)
-			continue;
-		objdump__insert_line(&browser.entries, rbpos);
 	}
 
-	/*
-	 * Position the browser at the hottest line.
-	 */
-	browser.curr_hot = rb_last(&browser.entries);
-	if (browser.curr_hot)
-		annotate_browser__set_top(&browser, browser.curr_hot);
-
 	browser.b.width += 18; /* Percentage */
-	ret = annotate_browser__run(&browser);
+	ret = annotate_browser__run(&browser, evidx, refresh);
 	list_for_each_entry_safe(pos, n, &notes->src->source, node) {
 		list_del(&pos->node);
 		objdump_line__free(pos);