Managing ownership of a full cache line using a store-create operation
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United States of America Patent
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-
May 31, 2005
Grant Date -
Jan 9, 2003
app pub date -
Mar 25, 2002
filing date -
Jul 6, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A system includes a plurality of processing clusters and a snoop controller. A first processing cluster in the plurality of processing clusters includes a first tier cache memory coupled to a second tier cache memory. The system employs a store-create operation to obtain sole ownership of a full cache line memory location for the first processing cluster, without retrieving the memory location from other processing clusters. The system issues the store-create operation for the memory location to the first tier cache. The first tier cache forwards a memory request including the store-create operation command to the second tier cache. The second tier cache determines whether the second tier cache has sole ownership of the memory location. If the second tier cache does not have sole ownership of the memory location, ownership of the memory location is relinquished by the other processing clusters with any ownership of the memory location.
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