perf_rdr_read_ubuf
static int perf_rdr_read_ubuf(uint32_t rdr_num, uint64_t *buffer);
if (!perf_rdr_read_ubuf(16, userbuf))
if (!perf_rdr_read_ubuf(15, userbuf)) {
perf_rdr_read_ubuf(*intrigue_rdr, buffer);