should be given to the number and type of privileged instructions to be
will reduce the amount of extra work
virtual machine channel command
storage and real devices and, in the case of minidisks, real cylinders.
2. Allocate real storage space to hold the real
storage and lock, for the duration of the
Address list if the real storage locations cross page boundaries.
reschedule the request when the subsequent interruFtion is received
(indicating staging is complete).
interrupts to the appropriate virtual machine, where they must then
be processed by the virtual machine operating system.
significant causes of reduced performance in virtual machines.
The number of
significantly reduced in several ways:
to reduce the total number of