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. 15, 2005
Filed:
Aug. 30, 2000
Donald C. Englin, Shoreview, MN (US);
Kelvin S. Vartti, Hugo, MN (US);
James L. Federici, Lino Lakes, MN (US);
Donald C. Englin, Shoreview, MN (US);
Kelvin S. Vartti, Hugo, MN (US);
James L. Federici, Lino Lakes, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A method of and apparatus for improving the efficiency of a data processing system employing a multiple level cache memory system. The efficiencies result from managing the process of flushing old data from the second level cache memory. In the present invention, the second level cache memory is a store-in memory. Therefore, when data is to be deleted from the second level cache memory, a determination is made whether the data has been modified by the processor. If the data has been modified, the data must be rewritten to lower level memory. To free the second level cache memory for storage of the newly requested data, the data to be flush is loaded into a flush buffer for storage during the rewriting process.