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Status Future consideration
Workspace z/OS
Categories LE
Created by Guest
Created on Jun 15, 2017

RELATED IDEAS

LE Load Notification User exit : Add RMODE indicator values to CEEFLG in CEELNUE csect

In the LE Load Notification User exit it would be very valuable to identify the RMODE of the program which caused the exit to be accessed. 24-bit and even 31-bit storage can be exhausted in environments with many architectural modules for IMS application systems. While it's possible to examine storage availability, the current exit options don't identify the RMODE of the subject program so if 24-bit private is exhausted it's costly (in CPU) to determine if the subject program can be retained in memory without risking an out of storage condition because without issuing a LOAD or BLDL it can't be determined if the subject program is 24-bit or 31-bit. Under the current exit options a BLDL would have to be used to find the RMODE of the subject program but that somewhat defeats the purpose of the exit; to improve program load performance (through program retention in memory).
Since the exit is called only after a successful program LOAD it would be simple to add flag values to the CEEFLG flag in the CEELNUE csect to indicate the RMODE of the successfully loaded program module. At that point, assuming the exit is tracking private storage use, the exit can quickly determine if the module is a candidate to be retained in 31-bit memory even if 24-bit memory is nearly exhausted.

Idea priority Medium

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