METHOD AND APPARATUS TO WRITE MODIFIED CACHE DATA TO A BACKING STORE WHILE RETAINING WRITE PERMISSIONS

摘要

A method is described that includes performing the following for a transactional operation in response to a request from a processing unit that is directed to a cache identifying a cache line. Reading the cache line, and, if the cache line is in a Modified cache coherency protocol state, forwarding the cache line to circuitry that will cause the cache line to be written to deeper storage, and, changing another instance of the cache line that is available to the processing unit for the transactional operation to an Exclusive cache coherency state