1. A method comprising: providing at least one bit in a first cache memory to indicate that a memory space unit associated with a second cache memory is an exclusively owned memory space unit; setting the at least one bit in the first cache memory to indicate that the memory space unit is exclusively owned by the second cache memory; and allowing a store operation that misses a target memory space unit in the second cache memory to commit, upon resubmission of the store operation, despite missing the target memory space unit in the second cache memory when the store operation was originally submitted if the target memory space unit of the store operation is the indicated exclusively-owned memory space unit; and wherein the indicated exclusively-owned memory space unit is indicated as such when there is not a copy of data of the target memory space unit in the second cache memory; wherein allowing the missing store operation to proceed comprises: installing an entry in the second cache memory with data of the store operation for the memory space unit; requesting a copy of data located at the exclusively-owned memory space unit from a memory space; retrieving the data from the memory space; and updating the installed entry with the copy of the data modified by the store operation data of the store operation.