Invention Grant
US09229866B2 Delaying cache data array updates 有权
延迟缓存数据阵列更新

Delaying cache data array updates
Abstract:
Systems, methods, and apparatuses for reducing writes to the data array of a cache. A cache hierarchy includes one or more L1 caches and a L2 cache inclusive of the L2 cache(s). When a request from the L1 cache misses in the L2 cache, the L2 cache sends a fill request to memory. When the fill data returns from memory, the L2 cache delays writing the fill data to its data array. Instead, this cache line is written to the L1 cache and a clean-evict bit corresponding to the cache line is set in the L1 cache. When the L1 cache evicts this cache line, the L1 cache will write back the cache line to the L2 cache even if the cache line has not been modified.
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