Filtering of redundantly scheduled write passes

A method of improving access to a cache by a processing unit, the method comprising:

• determining whether a new stream of instructions has begun, the new stream of instructions including one or more read passes followed by one or more write passes;
• determining whether a successful cache access has occurred in the new stream of instructions;
• and
• suppressing a next write cache access if the new stream of instructions has begun and the successful cache access has occurred, wherein the next write cache access prevents concurrent read accesses.

A method of improving access to a multilevel cache system by a processing unit, the method comprising:

• determining whether a request to access data from a lower level cache in a multilevel cache system is likely to succeed, wherein the request will execute in a stream of instructions, the stream of instructions including one or more read passes followed by one or more write passes;
• determining, if the request to access data is not likely to succeed, whether the request to access data from the lower level cache is redundant of a previous request;
• scheduling, if the request to access data from the lower level cache is not redundant, a cache write access;
• requesting data from a higher level cache;
• waiting for the requested data from the higher level cache;
• and
• scheduling, if the request to access data from the higher level cache is not successful, a subsequent cache write access, wherein the subsequent write cache access prevents concurrent read accesses.