Method and apparatus for supporting opportunistic sharing in coherent multiprocessors

A method, comprising:

• evicting a dirty cache line from a first cache in a first processor;
• sending a snoop request for a first replacement block to a second processor;
• if a first replacement block is available, then sending an interprocessor interface message from said second processor indicating the availability of said first replacement block;
• and
• sending said first dirty cache line from said first processor to said first replacement block in said second processor.

A system, comprising:

• an interprocessor interface;
• an audio input output coupled via an interface to said interprocessor interface;
• a first processor, including a first cache to evict a dirty cache line, and a first interprocessor interface logic coupled to said first cache and to said interprocessor interface;
• to initiate a snoop request along said interprocessor interface corresponding to said dirty cache line;
• and
• a second processor, including a second cache with a first replacement block, and a second interprocessor interface logic coupled to said second cache and said interprocessor interface, to respond to said snoop request when a first replacement block is available to receive said dirty cache line.