发明名称 |
SPECIFYING AN ACCESS HINT FOR PREFETCHING LIMITED USE DATA IN A CACHE HIERARCHY |
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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申请公布号 |
US2010268885(A1) |
申请公布日期 |
2010.10.21 |
申请号 |
US20090424681 |
申请日期 |
2009.04.16 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
FREY BRADLY G.;GUTHRIE GUY L.;MAY CATHY;SINHAROY BALARAM;SZWED PETER K. |
分类号 |
G06F12/08;G06F12/00 |
主分类号 |
G06F12/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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