Reusing AXs and EAXs

The combined number of AXs and EAXs available for all programs in the system is 16382. When an address space that owns AXs terminates or when the AXs are explicitly freed through AXFRE, those AXs are available for the system to reassign.

The system reuses EAXs in the same way it reuses ASIDs. The system does not reuse an EAX until all programs that could potentially access the address space have completed. In the example in Figure 1, assume that A owns an EAX in the entry table connected to B, and B owns an EAX in an entry table connected to all address spaces (because B has a system LX), and C owns an EAX in the entry table connected to D. In this example, the system reuses the EAXs as follows:

A's EAX is reusable only after a reIPL (because A connected to B, which owns a system LX).
B's EAX is reusable only after a reIPL (because B owns a system LX).
C's EAX is reusable after both C and D terminate.