perf tools: Add event_update event cpus type

Adding the cpumask 'event update' event, that stores/transfer the
cpumask for a event.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-25-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/event_update.c

@@ -53,6 +53,29 @@ static int process_event_name(struct perf_tool *tool,
 	return 0;
 }
 
+static int process_event_cpus(struct perf_tool *tool __maybe_unused,
+			      union perf_event *event,
+			      struct perf_sample *sample __maybe_unused,
+			      struct machine *machine __maybe_unused)
+{
+	struct event_update_event *ev = (struct event_update_event*) event;
+	struct event_update_event_cpus *ev_data;
+	struct cpu_map *map;
+
+	ev_data = (struct event_update_event_cpus*) ev->data;
+
+	map = cpu_map__new_data(&ev_data->cpus);
+
+	TEST_ASSERT_VAL("wrong id", ev->id == 123);
+	TEST_ASSERT_VAL("wrong type", ev->type == PERF_EVENT_UPDATE__CPUS);
+	TEST_ASSERT_VAL("wrong cpus", map->nr == 3);
+	TEST_ASSERT_VAL("wrong cpus", map->map[0] == 1);
+	TEST_ASSERT_VAL("wrong cpus", map->map[1] == 2);
+	TEST_ASSERT_VAL("wrong cpus", map->map[2] == 3);
+	cpu_map__put(map);
+	return 0;
+}
+
 int test__event_update(int subtest __maybe_unused)
 {
 	struct perf_evlist *evlist;
@@ -84,5 +107,11 @@ int test__event_update(int subtest __maybe_unused)
 	TEST_ASSERT_VAL("failed to synthesize attr update name",
 			!perf_event__synthesize_event_update_name(&tmp.tool, evsel, process_event_name));
 
+	evsel->own_cpus = cpu_map__new("1,2,3");
+
+	TEST_ASSERT_VAL("failed to synthesize attr update cpus",
+			!perf_event__synthesize_event_update_cpus(&tmp.tool, evsel, process_event_cpus));
+
+	cpu_map__put(evsel->own_cpus);
 	return 0;
 }

tools/perf/util/event.h

@@ -312,6 +312,11 @@ enum {
 	PERF_EVENT_UPDATE__UNIT  = 0,
 	PERF_EVENT_UPDATE__SCALE = 1,
 	PERF_EVENT_UPDATE__NAME  = 2,
+	PERF_EVENT_UPDATE__CPUS  = 3,
+};
+
+struct event_update_event_cpus {
+	struct cpu_map_data cpus;
 };
 
 struct event_update_event_scale {

tools/perf/util/header.c

@@ -2762,6 +2762,38 @@ perf_event__synthesize_event_update_name(struct perf_tool *tool,
 	return err;
 }
 
+int
+perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
+					struct perf_evsel *evsel,
+					perf_event__handler_t process)
+{
+	size_t size = sizeof(struct event_update_event);
+	struct event_update_event *ev;
+	int max, err;
+	u16 type;
+
+	if (!evsel->own_cpus)
+		return 0;
+
+	ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
+	if (!ev)
+		return -ENOMEM;
+
+	ev->header.type = PERF_RECORD_EVENT_UPDATE;
+	ev->header.size = (u16)size;
+	ev->type = PERF_EVENT_UPDATE__CPUS;
+	ev->id   = evsel->id[0];
+
+	cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
+				 evsel->own_cpus,
+				 type, max);
+
+	err = process(tool, (union perf_event*) ev, NULL, NULL);
+	free(ev);
+	return err;
+}
+
+
 int perf_event__synthesize_attrs(struct perf_tool *tool,
 				   struct perf_session *session,
 				   perf_event__handler_t process)
@@ -2827,8 +2859,10 @@ int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
 {
 	struct event_update_event *ev = &event->event_update;
 	struct event_update_event_scale *ev_scale;
+	struct event_update_event_cpus *ev_cpus;
 	struct perf_evlist *evlist;
 	struct perf_evsel *evsel;
+	struct cpu_map *map;
 
 	if (!pevlist || *pevlist == NULL)
 		return -EINVAL;
@@ -2849,6 +2883,14 @@ int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
 	case PERF_EVENT_UPDATE__SCALE:
 		ev_scale = (struct event_update_event_scale *) ev->data;
 		evsel->scale = ev_scale->scale;
+	case PERF_EVENT_UPDATE__CPUS:
+		ev_cpus = (struct event_update_event_cpus *) ev->data;
+
+		map = cpu_map__new_data(&ev_cpus->cpus);
+		if (map)
+			evsel->own_cpus = map;
+		else
+			pr_err("failed to get event_update cpus\n");
 	default:
 		break;
 	}

tools/perf/util/header.h

@@ -114,6 +114,9 @@ int perf_event__synthesize_event_update_scale(struct perf_tool *tool,
 int perf_event__synthesize_event_update_name(struct perf_tool *tool,
 					     struct perf_evsel *evsel,
 					     perf_event__handler_t process);
+int perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
+					     struct perf_evsel *evsel,
+					     perf_event__handler_t process);
 int perf_event__process_attr(struct perf_tool *tool, union perf_event *event,
 			     struct perf_evlist **pevlist);
 int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,