A system and method for reducing shared memory write overhead in multiprocessor system. In one embodiment, a multiprocessing system implements a method comprising storing an indication of obtained store permission corresponding to a particular address in a store buffer. The indication may be, for example, the address of a cache line for which a write permission has been obtained. Obtaining the write permission may include locking and modifying an MTAG or other coherence state entry. The method further comprises determining whether the indication of obtained store permission corresponds to an address of a write operation to be performed. In response to the indication corresponding to the address of the write operation to be performed, the write operation is performed without invoking corresponding global coherence operations.