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:
Aug. 25, 1992
Filed:
Jul. 26, 1988
Harold S Stone, Chappaqua, NY (US);
Joel L Wolf, Goldens Bridge, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A mechanism within a disk controller that computes the number of units of storage space accessed as a function of either real or virtual time. A counter is set to a reference count. Each unit of storage space has a predetermined bit set to a predetermined state indicative that the unit of storage space has not been accessed. The unit of storage space is accessed, and if the predetermined bit is in the predetermined state, the state is changed to indicate access. The counter is incremented in response to the change of state of the predetermined bit, with the count being indicative of the number of units of storage space accessed. This so-called 'footprint' function can be used by the disk controller as input for an algorithm that attempts to optimize cache performance.