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:
Jun. 07, 1994
Filed:
Aug. 12, 1991
Kevin A Chiarot, Poughkeepsie, NY (US);
Richard J Schmalz, Wappinger Falls, NY (US);
Theodore J Schmitt, Kingston, NY (US);
Arnold S Tran, Shokan, NY (US);
Shih-Hsiung S Tung, Kingston, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An improved DLAT structure distinguishes between address spaces and data spaces. The DLAT structure classifies data spaces by one or more space identifications which control assignment of virtual page addresses to DLAT rows. In one embodiment, a 'private space bit' is used to select different DLAT addressing algorithms. In another embodiment, data spaces are sub-classified using space identification bits, and for each sub-class, a unique algorithm is selected based on the page address bits. An Exclusive OR function is used to generate the DLAT selection bits. This approach minimizes private space synonyms while maximizing common space synonyms. The result is improved performance since the former minimizes thrashing and the latter maximizes the value of the DLAT common bit.