Virtual extension storage system

Abstract

Abstract PURPOSE:To reduce an overhead of a main storage control by dividing the storage area of a main memory device of a physically signal structure into a main storage area and an extended storage area and controlling the extended storage area for page storage of the main storage area after changing the extended storage area into a double layer structure. CONSTITUTION:The storage area of the main memory device 12 of a physically single structure is divided into a main storage area 121 and an extended storage area 122. The direct access is possible with the area 121 through a CPU 11 and not possible with the area 122. Then the pages having the high possibility of use according to the jobs to be executed are stored previously in the area 122. A main storage control part 111 of the CPU 11 converts a logic address into a read address when an access is given to the main storage and then performs previously a page exchanging process for page-out/in when no corresponding page exists in the area 121. This page exchanging process is carried out at high speed with the area 122. A boundary register 112 is used for the indication of the boundary between the areas 121 and 122. Thus the overhead of the main storage control can be reduced.

Inventors

• 👤 Mitsuyuki Maruyama
• 👤 丸山　光行

Bibliographic Details