Dynamic Reconfiguration of main storage and expanded storage by means of a service call logical processor

A data processing system including a processing unit for program execution and for data processing, an operating system program for controlling the operation of said data processing system, and a service call logical processor, said data processing system comprising in combination:

• a pool of increments of physical memory, from which pool, increments of main memory address locations and increments of expanded memory address locations are assigned;
• a configuration table including flags which indicate the assigned status of an increment in said pool of increments of physical memory as an increment of main memory address locations, as an increment of unassigned main memory address locations, as an increment of expanded memory address locations, or as an increment of unassigned expanded memory address locations;
• said service call logical processor dynamically changing an increment status in said pool of increments of physical memory by means of a service call instruction which changes a flag associated with the increment to be changed without disruption of the operating system program or any application program;
• said service call instruction including an instruction for changing the status of an increment assigned as main memory address locations to the status of unassigned main memory address locations, an instruction for changing the status of an increment unassigned as main memory address locations to the status of assigned as expanded memory address locations, an instruction for changing the status of an increment assigned as expanded memory address locations to the status of unassigned expanded memory address locations, and an instruction for changing the status of an increment unassigned as expanded memory address locations to the status of assigned as main memory address locations;
• wherein in hypervisor mode, when a logical partition is activated, said main memory address locations and said expanded memory address locations are assigned from the increment physical memory pool as specified by memory assignment parameters for said logical partition;
• and after said logical partition is activated, portions of said main memory address locations and said expanded memory address locations for said logical partition is unassigned in multiples of increments.