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:
Aug. 03, 2004
Filed:
Aug. 10, 2000
Bernd J. W. Mathiske, Santa Clara, CA (US);
Sun Microsystems, Inc., Santa Clara, CA (US);
Abstract
One embodiment of the present invention provides a system that facilitates storage of objects in a persistent memory with asymmetric access characteristics. The system operates by receiving an access to an object. If the access is a read access, the system looks up the object through an indirectory. This indirectory includes an entry that points to a location of the object within the persistent memory if updates to the object have been recorded in the persistent memory. Otherwise, the indirectory entry points to a location of the object within a volatile memory. If the object is located in the volatile memory, the system reads the object from the volatile memory. Otherwise, if the object is located in the persistent memory, the system reads the object from the persistent memory directly without first copying the object into the volatile memory. In one embodiment of the present invention, if the access is a write access, the system looks up the object through the indirectory. If the object is located in the persistent memory, the system allocates a location in the volatile memory for the object, and then copies the object from the persistent memory into the location in the volatile memory. The system then updates the indirectory entry for the object to point to the location in the volatile memory. Next, the system performs the write access to the object in the volatile memory. At a later time, the system commits the object to the persistent memory from the volatile memory.