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Layered local cache with lower level cache updating upper and lower level cache directories
Layered local cache with lower level cache updating upper and lower level cache directories
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机译:分层的本地缓存,具有较低级别的缓存,可更新较高和较低级别的缓存目录
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摘要
A method of improving memory access for a computer system, by sending load requests to a lower level storage subsystem along with associated information pertaining to intended use of the requested information by the requesting processor, without using a high level load queue. Returning the requested information to the processor along with the associated use information allows the information to be placed immediately without using reload buffers. A register load bus separate from the cache load bus (and having a smaller granularity) is used to return the information. An upper level (L1) cache may then be imprecisely reloaded (the upper level cache can also be imprecisely reloaded with store instructions). The lower level (L2) cache can monitor L1 and L2 cache activity, which can be used to select a victim cache block in the L1 cache (based on the additional L2 information), or to select a victim cache block in the L2 cache (based on the additional L1 information). L2 control of the L1 directory also allows certain snoop requests to be resolved without waiting for L1 acknowledgement. The invention can be applied to, e.g., instruction, operand data and translation caches.
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