Cache Prefetching via Miss History Feedback

The patent implements a feedback mechanism by monitoring cache miss addresses and storing them in a recent miss address buffer. The system uses this historical miss information to dynamically control prefetching operations, enabling prefetching only when historical data indicates a high probability of future cache misses at adjacent addresses. This feedback-based approach prevents unnecessary prefetching that would consume bandwidth and pollute the cache.

The patent performs preliminary analysis of cache miss history before executing prefetching operations. By examining recent miss addresses stored in the buffer and determining patterns of adjacent address misses, the system prepares and executes prefetching only when justified by historical data, rather than performing unconditional prefetching as in traditional stride or next line methods.

The system uses feedback from cached miss address history to intelligently control prefetching. By analyzing stored miss addresses in the recent miss address buffer and identifying patterns of adjacent address misses, the system enables prefetching only when historical evidence suggests it will be beneficial, thereby preventing cache pollution from loading unnecessary data that would displace useful cache contents.

Instead of performing full unconditional prefetching of adjacent lines, the patent applies partial prefetching only to specific addresses where cache misses are predicted based on historical patterns. This selective approach loads only the necessary data portions, avoiding the cache pollution that would result from loading entire adjacent lines regardless of actual need.

The patent implements a feedback-controlled prefetching system that monitors cache miss addresses and uses this information to dynamically enable or disable prefetching operations. This ensures that prefetching activities are performed only when historical data indicates they will improve performance, avoiding the performance penalties associated with unnecessary data loads that consume bandwidth and cache resources without providing benefit.

The system performs preliminary evaluation of cache miss history before executing prefetching operations. By examining recent miss patterns stored in the buffer and determining whether adjacent address misses are likely, the system prepares prefetching actions only when they are expected to improve performance, rather than performing unconditional prefetching that would incur performance penalties.