_GetData
status_t _GetData(size_t size);
static status_t _GetData(partition_id id, bool deviceOnly,
status_t error = _GetData(sizeof(system_profiler_event_header));
error = _GetData(header.size);
status_t error = _GetData(sizeof(debug_event_stream_header));
status_t error = _GetData(ID(), true, 0, &data);
status_t error = _GetData(id, deviceOnly, neededSize, &data);