MMG_CTLFLAGS

   MMG_CTLFLAGS is a bitmask used to enable or disable memory
   management-related activities.

   The first two bits, 0 and 1, control the proactive memory
   reclamation mechanisms. Bit 2 controls deferred memory testing.

   The following bit mask values are defined:

   Bit    Description

   0      If this bit is set, reclamation is enabled by trimming
          from periodically executing, but otherwise idle,
          processes. This occurs when the size of the free list
          plus the modified list drops below two times the value of
          FREEGOAL. This function is disabled if the bit is clear.

   1      If this bit is set, reclamation is enabled by outswapping
          processes that have been idle for longer than LONGWAIT
          seconds. This occurs when the size of the free list drops
          below FREEGOAL. This function is disabled if the bit is
          clear.

   2      Controls deferred memory testing (only on AlphaServer
          4100 systems). You can use this bit to speed up elapsed
          bootstrap time by controlling when memory is tested:

          o  If the bit is clear (the default), OpenVMS tests memory
             as a background activity, which might or might not
             complete before the end of the bootstrap process.

          o  If the bit is set, all memory is tested in the
             bootstrap process by the end of the EXEC_INIT phase
             (that is, before IPL is lowered from 31).

   3      Reserved to OpenVMS use; must be zero.

   4      If this bit is clear (the default), all page sizes
          supported by hardware can be used to map resident memory
          sections on Integrity servers. If this bit is set, page
          sizes on Integrity servers are limited to the maximum
          GH factor available on Alpha systems (512 * <system page
          size>).

   5-7    Reserved for future use.

   MMG_CTLFLAGS is an AUTOGEN and DYNAMIC parameter.