read_engine_activity_record
change_num = read_engine_activity_record(xe, &activity_map, change_num);
last_update_tick = read_engine_activity_record(xe, &activity_map, last_update_tick);
active_ticks = read_engine_activity_record(xe, &activity_map, active_ticks);
quanta_ratio = read_engine_activity_record(xe, &activity_map, quanta_ratio);