perf TUI: Add a "Zoom into COMM(PID) thread" and reverse operations

Now one can press the right arrow key and in addition to being able to
filter by DSO, filter out by thread too, or a combination of both
filters.

With this one can start collecting events for the whole system, then
focus on a subset of the collected data quickly.

Cc: Avi Kivity <avi@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/newt.c

@@ -490,6 +490,11 @@ static int hist_browser__populate(struct hist_browser *self, struct rb_root *his
 	return 0;
 }
 
+enum hist_filter {
+	HIST_FILTER__DSO,
+	HIST_FILTER__THREAD,
+};
+
 static u64 hists__filter_by_dso(struct rb_root *hists, struct dso *dso,
 				u64 *session_total)
 {
@@ -502,23 +507,65 @@ static u64 hists__filter_by_dso(struct rb_root *hists, struct dso *dso,
 		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
 
 		if (dso != NULL && (h->ms.map == NULL || h->ms.map->dso != dso)) {
-			h->filtered = true;
+			h->filtered |= (1 << HIST_FILTER__DSO);
 			continue;
 		}
-		h->filtered = false;
+		h->filtered &= ~(1 << HIST_FILTER__DSO);
 		++nr_hists;
 		*session_total += h->count;
 	}
 
 	return nr_hists;
 }
 
+static u64 hists__filter_by_thread(struct rb_root *hists, const struct thread *thread,
+				   u64 *session_total)
+{
+	struct rb_node *nd;
+	u64 nr_hists = 0;
+
+	*session_total = 0;
+
+	for (nd = rb_first(hists); nd; nd = rb_next(nd)) {
+		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
+
+		if (thread != NULL && h->thread != thread) {
+			h->filtered |= (1 << HIST_FILTER__THREAD);
+			continue;
+		}
+		h->filtered &= ~(1 << HIST_FILTER__THREAD);
+		++nr_hists;
+		*session_total += h->count;
+	}
+
+	return nr_hists;
+}
+
+static struct thread *hist_browser__selected_thread(struct hist_browser *self)
+{
+	int *indexes;
+
+	if (!symbol_conf.use_callchain)
+		goto out;
+
+	indexes = newtCheckboxTreeFindItem(self->tree, (void *)self->selection);
+	if (indexes) {
+		bool is_hist_entry = indexes[1] == NEWT_ARG_LAST;
+		free(indexes);
+		if (is_hist_entry)
+			goto out;
+	}
+	return NULL;
+out:
+	return *(struct thread **)(self->selection + 1);
+}
+
 int perf_session__browse_hists(struct rb_root *hists, u64 nr_hists,
 			       u64 session_total, const char *helpline,
 			       const char *input_name)
 {
 	struct newtExitStruct es;
-	bool dso_filtered = false;
+	bool dso_filtered = false, thread_filtered = false;
 	int err = -1;
 	struct hist_browser *browser = hist_browser__new();
 
@@ -531,9 +578,10 @@ int perf_session__browse_hists(struct rb_root *hists, u64 nr_hists,
 		goto out;
 
 	while (1) {
+		const struct thread *thread;
 		char *options[16];
 		int nr_options = 0, choice = 0, i,
-		    annotate = -2, zoom_dso = -2;
+		    annotate = -2, zoom_dso = -2, zoom_thread = -2;
 
 		newtFormRun(browser->form, &es);
 		if (es.reason == NEWT_EXIT_HOTKEY) {
@@ -561,6 +609,13 @@ int perf_session__browse_hists(struct rb_root *hists, u64 nr_hists,
 			      browser->selection->map->dso->short_name)) > 0)
 			zoom_dso = nr_options++;
 
+		thread = hist_browser__selected_thread(browser);
+		if (thread != NULL &&
+		    asprintf(&options[nr_options], "Zoom %s %s(%d) thread",
+			     (thread_filtered ? "out of" : "into"),
+			     (thread->comm_set ?  thread->comm : ""), thread->pid) > 0)
+			zoom_thread = nr_options++;
+
 		options[nr_options++] = (char *)"Exit";
 
 		choice = popup_menu(nr_options, options);
@@ -570,6 +625,9 @@ int perf_session__browse_hists(struct rb_root *hists, u64 nr_hists,
 
 		if (choice == nr_options - 1)
 			break;
+
+		if (choice == -1)
+			continue;
 do_annotate:
 		if (choice == annotate) {
 			if (browser->selection->map->dso->origin == DSO__ORIG_KERNEL) {
@@ -581,13 +639,21 @@ int perf_session__browse_hists(struct rb_root *hists, u64 nr_hists,
 			}
 			map_symbol__annotate_browser(browser->selection,
 						     input_name);
-		} if (choice == zoom_dso) {
-			hists__filter_by_dso(hists,
-					     dso_filtered ? NULL : browser->selection->map->dso,
-					     &session_total);
+		} else if (choice == zoom_dso) {
+			nr_hists = hists__filter_by_dso(hists,
+							(dso_filtered ? NULL :
+							 browser->selection->map->dso),
+							&session_total);
 			dso_filtered = !dso_filtered;
 			if (hist_browser__populate(browser, hists, nr_hists, session_total) < 0)
 				goto out;
+		} else if (choice == zoom_thread) {
+			nr_hists = hists__filter_by_thread(hists,
+							   (thread_filtered ? NULL : thread),
+							   &session_total);
+			thread_filtered = !thread_filtered;
+			if (hist_browser__populate(browser, hists, nr_hists, session_total) < 0)
+				goto out;
 		}
 	}
 	err = 0;

tools/perf/util/sort.h

@@ -44,11 +44,16 @@ extern enum sort_type sort__first_dimension;
 struct hist_entry {
 	struct rb_node		rb_node;
 	u64			count;
-	struct thread		*thread;
+	/*
+	 * XXX WARNING!
+	 * thread _has_ to come after ms, see
+	 * hist_browser__selected_thread in util/newt.c
+	 */
 	struct map_symbol	ms;
+	struct thread		*thread;
 	u64			ip;
 	char			level;
-	bool			filtered;
+	u8			filtered;
 	struct symbol		*parent;
 	union {
 		unsigned long	  position;