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. 14, 2012
Filed:
Dec. 16, 2008
Guy L. Guthrie, Austin, TX (US);
Thomas L. Jeremiah, Hillsborough, NC (US);
William L. Mcneil, Chapel Hill, NC (US);
Piyush C. Patel, Cary, NC (US);
William J. Starke, Round Rock, TX (US);
Jeffrey A. Stuecheli, Austin, TX (US);
Guy L. Guthrie, Austin, TX (US);
Thomas L. Jeremiah, Hillsborough, NC (US);
William L. McNeil, Chapel Hill, NC (US);
Piyush C. Patel, Cary, NC (US);
William J. Starke, Round Rock, TX (US);
Jeffrey A. Stuecheli, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A cache memory includes a cache array including a plurality of congruence classes each containing a plurality of cache lines, where each cache line belongs to one of multiple classes which include at least a first class and a second class. The cache memory also includes a cache directory of the cache array that indicates class membership. The cache memory further includes a cache controller that selects a victim cache line for eviction from a congruence class. If the congruence class contains a cache line belonging to the second class, the cache controller preferentially selects as the victim cache line a cache line of the congruence class belonging to the second class based upon access order. If the congruence class contains no cache line belonging to the second class, the cache controller selects as the victim cache line a cache line belonging to the first class based upon access order.