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:
Feb. 26, 2002
Filed:
Feb. 22, 2000
James E McCormick, Jr., Fort Collins, CO (US);
Steven Kenneth Saunders, Campbell, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
Methods and apparatus for storing data in a multi-level memory hierarchy having at least a lower level cache and a higher level cache. Relevancy information is maintained for various data values stored in the lower level cache, the relevancy information indicating whether the various data values stored in the lower level cache, if lost, could only be generated from corresponding data stored in the higher level cache. If one of the various data values stored in the lower level cache is to be updated, a determination as to whether corresponding data should be stored in the higher level cache is based at least in part on 1) the status of the relevancy information corresponding to the one of the various data values stored in the lower level cache which is to be updated, and 2) whether the updated value which is to be written into the lower level cache matches one or more select data value patterns.