Early shared resource release in symmetric multiprocessing computer systems

A system comprising:

• a cache controller in communication with one or more remote computing nodes;
• and
• one or more processors coupled to the cache controller and configured to:
• detect a cache miss for a cache line;
• reserve a resource on each of the one or more remote computing nodes, responsive to the cache miss;
• broadcast to the one or more remote computing nodes a request for a state of the cache line on the one or more remote computing nodes, the broadcasting responsive to the cache miss;
• receive a resource credit from a first remote computing node of the one or more remote computing nodes, the receiving responsive to the request, the resource credit indicating the first remote computing node will not participate in completing the request;
• and
• release the resource on the first remote computing node, the releasing responsive to receiving the resource credit from the first remote computing node.

A computer program product for early resource release in a symmetric multiprocessing system with cache coherence, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform a method comprising:

• detecting a cache miss for a cache line;
• reserving a resource on each of one or more remote computing nodes, the reserving responsive to the cache miss;
• broadcasting to the one or more remote computing nodes a request for a state of the cache line on the one or more remote computing nodes, the broadcasting responsive to the cache miss;
• receiving a resource credit from a first remote computing node of the one or more remote computing nodes, the receiving responsive to the request, the resource credit indicating the first remote computing node will not participate in completing the request;
• and
• releasing the resource on the first remote computing node, the releasing responsive to receiving the resource credit from the first remote computing node.