Specific Control Options › SWAP—Program Shopping › Paging

Paging

z/OS uses a technique known as Paging to allocate storage space in main memory. Paging enables z/OS to divide main memory into blocks of storage called Page Frames. Programs, like the one stored in the CA Top Secret address space, are divided into blocks of storage called pages. z/OS will only assign page frames to those pages of a program that are active. Inactive pages are stored on DASD until they are required to execute. When a page is required to execute, it is swapped into main memory and the page that has already executed is swapped out into auxiliary storage.

The CA Top Secret address space is active (swapped in):

• Whenever a user initiates or a job starts
• Whenever a password is changed (initiation only)
• For a violation statistics update/reset (initiation only)
• For the submission of a permitted ACID other than active user
• Whenever a TSS command is issued
• Every fifteen seconds (usually for logging/tracking) as specified by the TIMER control option default value
• Generally in IMPL mode for some data set violations.