An application can specify BUFTYPE=PAGEELIG on the GET_BUFFER, ASSIGN_BUFFER, and PAGE_BUFFER requests in order to classify buffers as eligible to be paged. CSM can maintain a status of eligible to be paged. The actual system state of a buffer with this status can be either fixed or pageable. CSM internally monitors the level of fixed storage usage. The buffers can remain fixed unless CSM determines that the storage should be made pageable. This avoids the unnecessary overhead of fixing and freeing storage from a system perspective.

This function avoids consuming fixed storage for data that is being held in a buffer for possible use at a later time.