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:
Apr. 07, 2015
Filed:
Jun. 14, 2012
Ekaterina M. Ambroladze, Wappingers Falls, NY (US);
Michael Blake, Wappingers Falls, NY (US);
Tim Bronson, Round Rock, TX (US);
Garrett Drapala, Poughkeepsie, NY (US);
Pak-kin Mak, Poughkeepsie, NY (US);
Arthur J. O'neill, Poughkeepsie, NY (US);
Ekaterina M. Ambroladze, Wappingers Falls, NY (US);
Michael Blake, Wappingers Falls, NY (US);
Tim Bronson, Round Rock, TX (US);
Garrett Drapala, Poughkeepsie, NY (US);
Pak-kin Mak, Poughkeepsie, NY (US);
Arthur J. O'Neill, Poughkeepsie, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A technique for cache coherency is provided. A cache controller selects a first set from multiple sets in a congruence class based on a cache miss for a first transaction, and places a lock on the entire congruence class in which the lock prevents other transactions from accessing the congruence class. The cache controller designates in a cache directory the first set with a marked bit indicating that the first transaction is working on the first set, and the marked bit for the first set prevents the other transactions from accessing the first set within the congruence class. The cache controller removes the lock on the congruence class based on the marked bit being designated for the first set, and resets the marked bit for the first set to an unmarked bit based on the first transaction completing work on the first set in the congruence class.