Eviction algorithm for inclusive lower level cache based upon state of higher level cache

摘要

A cache eviction algorithm for an inclusive cache determines which among a plurality of cache lines may be evicted from the inclusive cache based at least in part upon the state of the cache lines in a higher level cache. In particular, a cache eviction algorithm may determine, from an inclusive cache directory for a lower level cache, whether a cache line is cached in the lower level cache but not cached in any of a plurality of higher level caches for which cache directory information is additionally stored in the cache directory. Then, based upon determining that a cache line is cached in the lower level cache but not cached in any of the plurality of higher level caches, the cache eviction algorithm may select that cache line for eviction from the cache.