The Free On-line Dictionary of Computing (30 December 2018):

prepaging
working set model

    (Or "working set model") A technique whereby
   the operating system in a paging virtual memory
   multitasking environment loads all pages of a process's
   working set into memory before the process is restarted.

   Under demand paging a process accesses its working set by
   page faults every time it is restarted.  Under prepaging the
   system remembers the pages in each process's working set and
   loads them into physical memory before restarting the process.
   Prepaging reduces the page fault rate of reloaded processes
   and hence generally improves CPU efficiency.

   ["Modern Operating Systems", Andrew S. Tanenbaum,
   pub. Prentice Hall, Inc.  1992].

   (1998-04-23)