A computer system includes a directory at each node which stores coherency information for the coherency units for which that node is the home node. In addition, the directory stores a data access state corresponding to each coherency unit which indicates the data access pattern observed for that...http://www.google.de/patents/US5734922?utm_source=gb-gplus-sharePatent US5734922 - Multiprocessing system configured to detect and efficiently provide for migratory data access patterns 
