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:
Dec. 04, 2012
Filed:
Jul. 23, 2008
Guy L. Guthrie, Austin, TX (US);
Thomas L. Jeremiah, Hillsborough, NC (US);
William J. Starke, Round Rock, TX (US);
Phillip G. Williams, Leander, TX (US);
Guy L. Guthrie, Austin, TX (US);
Thomas L. Jeremiah, Hillsborough, NC (US);
William J. Starke, Round Rock, TX (US);
Phillip G. Williams, Leander, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A data processing system includes a processor core having an associated upper level cache and a lower level victim cache. In response to a memory access request of the processor core, the lower level cache victim determines whether the memory access request hits or misses in the directory of the lower level victim cache, and the upper level cache determines whether a castout from the upper level cache is to be performed and selects a victim coherency granule for eviction from the upper level cache. In response to determining that a castout from the upper level cache is to be performed, the upper level cache evicts the selected victim coherency granule. In the eviction, the upper level cache reads out the victim coherency granule from the data array of the upper level cache only in response to an indication that the memory access request misses in the directory of the lower level victim cache.