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. 03, 2015
Filed:
Mar. 11, 2009
Guy L. Guthrie, Austin, TX (US);
Hien M. Le, Cedar Park, TX (US);
Alvan W. NG, Austin, TX (US);
Michael S. Siegel, Raleigh, NC (US);
Derek E. Williams, Austin, TX (US);
Phillip G. Williams, Leander, TX (US);
Guy L. Guthrie, Austin, TX (US);
Hien M. Le, Cedar Park, TX (US);
Alvan W. Ng, Austin, TX (US);
Michael S. Siegel, Raleigh, NC (US);
Derek E. Williams, Austin, TX (US);
Phillip G. Williams, Leander, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A victim cache line having a data-invalid coherence state is selected for castout from a first lower level cache of a first processing unit. The first processing unit issues on an interconnect fabric a lateral castout (LCO) command identifying the victim cache line to be castout from the first lower level cache, indicating the data-invalid coherence state, and indicating that a lower level cache is an intended destination of the victim cache line. In response to a coherence response to the LCO command indicating success of the LCO command, the victim cache line is removed from the first lower level cache and held in a second lower level cache of a second processing unit in the data-invalid coherence state.