The PSWAPM privilege lets the user's process control whether
it can be swapped out of the balance set by executing the Set Process
Swap Mode ($SETSWM) system service. A process must have this privilege
to lock itself in the balance set (to disable swapping) or to unlock
itself from the balance set (to enable swapping).
With this privilege, a process can create a process that is
locked in the balance set (swap mode is disabled) by using an optional
argument to the Create Process ($CREPRC) system service or, when
the DCL command RUN is used to create a process, by using the /NOSWAPPING
qualifier of the RUN command. Furthermore, a process can lock a
page or range of pages in physical memory using the Lock Pages in
Memory ($LCKPAG) system service.
Grant this privilege only to users who need to lock a process
in memory for performance reasons. Typically, this will be a real-time
process. If unqualified processes have the unrestricted ability
to lock processes in the balance set, physical memory can be held
unnecessarily and thereby degrade system performance.
HP OpenVMS Guide to System Security
Security for the System Administrator
