Systems, methods, and devices for cache block coherence

摘要

Systems, methods, and devices for efficient cache coherence between memory-sharing devices 12A and 12B are provided. In particular, snoop traffic may be suppressed based at least partly on a table of block tracking entries (BTEs). Each BTE may indicate whether groups of one or more cache lines of a block of memory could potentially be in use by another memory-sharing device 12A and 12B. By way of example, a memory-sharing device 12 may employ a table of BTEs 56 that each has several cache status entries. When a cache status entry indicates that none of a group of one or more cache lines could possibly be in use by another memory-sharing device 12, a snoop request for any cache lines of that group may be suppressed without jeopardizing cache coherence.