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

主权项

1. A processor, comprising:
a) a plurality of processing cores; b) a cache communicatively coupled to the processing cores, the cache to store cache lines; c) logic circuitry associated with the cache to perform the following for a transactional operation in response to a request from one of the processing cores that is directed to the cache identifying a cache line:
read the cache line, and, if the cache line is in a Modified cache coherency protocol state, forward the cache line to circuitry that will cause the cache line to be written to deeper storage, and,change another instance of the cache line that is available to the processing cores for the transactional operation to an Exclusive cache coherency state.