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SPECIFYING AN ACCESS HINT FOR PREFETCHING LIMITED USE DATA IN A CACHE HIERARCHY
SPECIFYING AN ACCESS HINT FOR PREFETCHING LIMITED USE DATA IN A CACHE HIERARCHY
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机译:在缓存层次结构中指定用于预备有限使用数据的访问提示
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摘要
A system and method for specifying an access hint for prefetching limited use data. A processing unit receives a data cache block touch (DCBT) instruction having an access hint indicating to the processing unit that a program executing on the data processing system may soon access a cache block addressed within the DCBT instruction. The access hint is contained in a code point stored in a subfield of the DCBT instruction. In response to detecting that the code point is set to a specific value, the data addressed in the DCBT instruction is prefetched into an entry in the lower level cache. The entry may then be updated as a least recently used entry of a plurality of entries in the lower level cache. In response to a new cache block being fetched to the cache, the prefetched cache block is cast out of the cache.
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