Separate data and coherency cache directories in a shared cache in a multiprocessor system

A dual system shared cache directory structure for a cache memory performs the role of an inclusive shared system cache, i.e., data, and system control, i.e., coherency. The system includes two separate system cache directories in the shared system cache. The two separate cache directories are subst...

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Bibliographic Details
Main Authors HUTTON DAVID S, MAK PAK-KIN, LANGSTON KEITH N, JACKSON KATHRYN M, WAGAR BRUCE
Format Patent
LanguageEnglish
Published 06.01.2009
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A dual system shared cache directory structure for a cache memory performs the role of an inclusive shared system cache, i.e., data, and system control, i.e., coherency. The system includes two separate system cache directories in the shared system cache. The two separate cache directories are substantially equal in size and collectively large enough to contain all of the processor cache directory entries, but with only one of these separate cache directories hosting system-cache data to back the most recent fraction of data accessed by the processors. The other cache directory retains only addresses, including addresses of lines LRUed out from the first cache directory and the identity of the processor using the data. Thus by this expedient, only the directory known to be backed by system cached data will be evaluated for system cache memory data.
Bibliography:Application Number: US20060334280