Method to operate on large segments of data in a virtual memory

Details Method to operate on large segments of data in a virtual memory Method to operate on large segments of data in a virtual memory

1986-01-16

1988-03-08

Williams, Jr., Archie E.

Boots, shoes, and leggings

364300, G06F 1500, G06F 1208

Patent

active

047302496

ABSTRACT:
A method for use in a virtual memory data processing system employing a pageable External Page Table data structure for recording current status and disk address information for each virtual page in said system, provides improved system performance when a large number of virtual pages are to be operated on in the same manner. In accordance with the method, each page of External Page Table entries can record a predetermined number of entries (512), depending on the byte capacity of each virtual page (2,048) and the size of each entry (4 bytes). One page of 512 entries correspond to 1 megabyte of virtual storage (512.times.2,048) and also appears as one entry in a pinned External Page Table. The pinned External Page Table is referred to as the "XPT of the XPT," and has the same format as the pageable XPT. A 256 megabyte segment of virtual memory is representable in the XPT of the XPT by 256, 4 byte entries, or one-half of a page.
Where all virtual pages represented by a page of XPT entries are to be processed in the same way (i.e., created, destroyed), one operation on one entry in the XPT of the XPT is made, rather than 512 operations on the 512 entries of the XPT.

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patent: 4532590 (1985-07-01), Wallach et al.
patent: 4569018 (1986-02-01), Hummel et al.
patent: 4654777 (1987-03-01), Nakamura

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