Exemplo n.º 1
0
static int create_perf_stat_counter(struct perf_evsel *evsel)
{
	struct perf_event_attr *attr = &evsel->attr;

	if (stat_config.scale)
		attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
				    PERF_FORMAT_TOTAL_TIME_RUNNING;

	attr->inherit = !no_inherit;

	if (target__has_cpu(&target))
		return perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));

	if (!target__has_task(&target) && perf_evsel__is_group_leader(evsel)) {
		attr->disabled = 1;
		if (!initial_delay)
			attr->enable_on_exec = 1;
	}

	return perf_evsel__open_per_thread(evsel, evsel_list->threads);
}
Exemplo n.º 2
0
int test__open_syscall_event(void)
{
	int err = -1, fd;
	struct thread_map *threads;
	struct perf_evsel *evsel;
	struct perf_event_attr attr;
	unsigned int nr_open_calls = 111, i;
	int id = trace_event__id("sys_enter_open");

	if (id < 0) {
		pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
		return -1;
	}

	threads = thread_map__new(-1, getpid(), UINT_MAX);
	if (threads == NULL) {
		pr_debug("thread_map__new\n");
		return -1;
	}

	memset(&attr, 0, sizeof(attr));
	attr.type = PERF_TYPE_TRACEPOINT;
	attr.config = id;
	evsel = perf_evsel__new(&attr, 0);
	if (evsel == NULL) {
		pr_debug("perf_evsel__new\n");
		goto out_thread_map_delete;
	}

	if (perf_evsel__open_per_thread(evsel, threads) < 0) {
		pr_debug("failed to open counter: %s, "
			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
			 strerror(errno));
		goto out_evsel_delete;
	}

	for (i = 0; i < nr_open_calls; ++i) {
		fd = open("/etc/passwd", O_RDONLY);
		close(fd);
	}

	if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
		pr_debug("perf_evsel__read_on_cpu\n");
		goto out_close_fd;
	}

	if (evsel->counts->cpu[0].val != nr_open_calls) {
		pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
			 nr_open_calls, evsel->counts->cpu[0].val);
		goto out_close_fd;
	}

	err = 0;
out_close_fd:
	perf_evsel__close_fd(evsel, 1, threads->nr);
out_evsel_delete:
	perf_evsel__delete(evsel);
out_thread_map_delete:
	thread_map__delete(threads);
	return err;
}