perf_record_read
struct perf_record_read read;
member_def(perf_record_read, pid, T_UINT, "event pid"),
member_def(perf_record_read, tid, T_UINT, "event tid"),
[PERF_RECORD_READ] = offsetof(struct perf_record_read, time_enabled),
tail = event->header.size - offsetof(struct perf_record_read, value);