A method and apparatus for maintaining coherence information in multi-cache systems is described herein. In one embodiment, the apparatus includes an Ingrained Sharing Directory Cache (ISDC) to store state information about recent copies of local memory blocks. The ISDC is adapted to receive Ingrained...http://www.google.com/patents/US7370154?utm_source=gb-gplus-sharePatent US7370154 - Method and apparatus for maintaining coherence information in multi-cache systems