IWMMXDC – Exit For Collecting Resource Data

IWMMXDC invokes the resource data collection exit specified. This exit returns information about the usage of the buffer pool or other resources which may be responsible for delays to work requests. The return and reason codes for IWMMXDC are those set by the exit invoked.

The exit environment is described in the following. The parameter list is in the same key as the PSW at the time of invocation and is in pageable storage addressable from the current address space. Upon entry to the exit, the register contents are as follows:

• Register 0 = not defined
• Register 1 contains the address of a parameter list as formatted by the list form of this macro, IWMMXDC MF=(L).
• Registers 2-13 = not defined
• Register 14 = return address
• Register 15 = entry-point address

Upon entry to the exit, the access register contents are undefined.

Upon return from the exit, the register contents are as follows:

• Register 0 = Reason code if GR15 return code is non-zero
• Registers 1-14 = not defined (need not be restored to value on entry)
• Register 15 = Return code

Upon return from the exit, the access register contents are unchanged.