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AssigneeInternational Business Machines Corporation
InventorsRavi Kumar Arimilli, John Steven Dodson, Guy Lynn Guthrie, Jody B. Joyner, Jerry Don Lewis
Estimating the term…
Combined response logic for a bus receives a combined data access and cast out/deallocate operation initiating by a storage device within a specific level of a storage hierarchy with a coherency state of the cast out/deallocate victim appended. Snoopers on the bus drive snoop responses to the combined operation with the coherency state and/or LRU position of locally-stored cache lines corresponding to the victim appended. The combined response logic determines, from the coherency state information appended to the combined operation and the snoop responses, whether a coherency upgrade is possible. If so, the combined response logic selects a snooper storage device to upgrade the coherency state of a respective cache line corresponding to the victim, and appends an upgrade directive to the combined response. The snooper selected to upgrade the coherency state of a cache line corresponding the victim may be randomly chosen or, as an optimization, be chosen for having the highest LRU position for the respective cache line.
A method of data storage management, comprising:
A system for data storage management, comprising:
A method of upgrading a coherency state, comprising:
Dependencies are inferred from the claim text.