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US 2010/0161904 A1Published application
Cache hierarchy with bounds on levels accessed
AssigneeSun Microsystems, Inc.
InventorsRobert Cypher, Haakan Zeffer, Anders Landin
Life of this patent
Estimating the term…
Abstract
The present invention is directed to a system managing data in a multilevel cache memory system. Certain cache data is designated and stored only in particular levels of the multilevel cache, bypassing other levels of the multilevel cache. In a multiprocessor environment, the present invention includes cache coherency operations or messages that pertain to data stored only in certain levels of a multilevel cache.
Claims20
A method of managing data in a multi-level cache, comprising:
- determining that a request for a data item is designated as a first type of request;
- performing a cache access for the data item in a low level of a multilevel cache, the multilevel cache including a hierarchy having at least the low level and a high level;
- in response to a cache miss for the data item in the low level, receiving the data item from a memory, the memory not including the high level of the multilevel cache;
- and
- storing the data item in the multilevel cache as a cache line, wherein the cache line is allocated in the low level and not allocated in the high level portion.
2 more elements
A cache system, comprising:
- a multilevel cache having a hierarchy including at least a low level and a high level;
- and
- a cache controller connected to the multilevel cache, the cache controller operable to store a cache line in the low level and not in the high level.
A cache system, comprising:
- means for caching data, the means for caching data having a hierarchy including at least a low level and a high level;
- and
- means for controlling the means for caching, wherein the means for controlling is connected to the means for caching, the means for controlling operable to store a cache line in the low level of the means for caching and not in the high level of the means for caching.
Dependencies are inferred from the claim text.