The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 1995
Filed:
Apr. 22, 1992
Shrikant N Parikh, Mesquite, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A multi-bit SP-Vector is created to record the history of each page of a process. Each time an ager scans the accessed/not accessed bit flag of the page tables entires, the SP-Vector is updated to reflect whether or not the corresponding page was accessed. A table is created to provide ready update and interpretation information for each SP-Vector depending upon whether or not the last scan indicated an accessed or not accessed status. The table further contains a running total of the number of accesses for each SP-Vector which allows a rapid determination of which pages have been accessed the least. The least accessed pages may then be selected for swapping out of physical memory.