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:
May. 31, 1994
Filed:
Aug. 20, 1992
Applicant:
Inventor:
Lishing Liu, Pleasantville, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395425 ; 36424344 ; 3642468 ; 3642558 ; 364D / ;
Abstract
A method for increasing cache concurrency in a multiprocessor system. In a multiprocessor system having a plurality of processors each having a local cache in order to increase concurrency the directory entry for a line in local cache will be assigned an LCH bit for locally changed status. If the last cache to hold the line had made a change to it this bit will be set on. If not, the bit will be off and thereby allow the receiving or requesting cache to make change to the line without requiring a main storage castout.