Distances between objects.
One object may contain a distance structure describing distances between all its descendants at a given relative depth. If the containing object is the root object of the topology, then the distances are available for all objects in the machine.
latency pointer is not
NULL, the pointed array contains memory latencies (non-zero values), as defined by the ACPI SLIT specification.
In the future, some other types of distances may be considered. In these cases,
latency may be