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ABCs of IBM z/OS System Programming Volume 2 by Lutz Kuehner, Guillermo Cosimo

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LPA, LNKLST, and authorized libraries
To maximize the performance for retrieving executable programs, z/OS is designed to maintain in memory those executable programs that are needed for fast response to requests coming from z/OS components and from critical applications. Link pack area (LPA), LNKLST, and authorized program facility (APF) libraries described here are the cornerstone of the executable program fetching process. Also the roles of Virtual Lookaside Facility (VLF) and Linklist Lookaside (LLA) components are described at the appropriate ...

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