Access authorization table for multi-processor caches

A multi-processor (MP) system having shared storage is provided with locking of exclusivity status and read only status in multi-processor caches. The multi-processor system includes a plurality of processors, a shared main storage and a storage control element (SCE). The storage control element inc...

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Bibliographic Details
Main Author LIU; LISHING
Format Patent
LanguageEnglish
Published 20.07.1993
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A multi-processor (MP) system having shared storage is provided with locking of exclusivity status and read only status in multi-processor caches. The multi-processor system includes a plurality of processors, a shared main storage and a storage control element (SCE). The storage control element includes a global access authorization table (GAAT). Locking of exclusivity status in multi-processor caches is accomplished by providing at each processor a local access authorization table (AAT) containing access status for recently used data blocks wherein the size of a data block is a multiple of cache line size. The access status of a block in the local access authorization table is checked when the block is to be accessed by a processor. Only if the access status for a block is not found in the local access authorization table is authorization to access the block requested from the storage control element.
Bibliography:Application Number: US19920984001