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, 2008
Filed:
Feb. 10, 2005
Guy Lynn Guthrie, Austin, TX (US);
William John Starke, Round Rock, TX (US);
Derek Edward Williams, Austin, TX (US);
Philip G. Williams, Leander, TX (US);
Guy Lynn Guthrie, Austin, TX (US);
William John Starke, Round Rock, TX (US);
Derek Edward Williams, Austin, TX (US);
Philip G. Williams, Leander, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and method for cache management in a data processing system having a memory hierarchy of upper memory and lower memory cache. A lower memory cache controller accesses a coherency state table to determine replacement policies of coherency states for cache lines present in the lower memory cache when receiving a cast-in request from one of the upper memory caches. The coherency state table implements a replacement policy that retains the more valuable cache coherency state information between the upper and lower memory caches for a particular cache line contained in both levels of memory at the time of cast-out from the upper memory cache.