perf_data__write
size = perf_data__write(&inject->output, buf, sz);
if (perf_data__write(sched->data, event, event->header.size) <= 0) {
if (perf_data__write(&perf_stat.data, event, event->header.size) < 0) {
ssize_t perf_data__write(struct perf_data *data,
size = perf_data__write(jd->output, event, event->header.size);