Hybrid tracking of transaction read and write sets

A computer implemented method for tracking of processor transactional read and write sets comprising:

• maintaining a non-speculative read set indication of non-speculative reads of data stored in a cache by a processor cache unit for a transaction by a first requestor;
• maintaining a non-speculative write set indication of non-speculative writes of written data stored in the cache by the processor cache unit by the first requestor;
• maintaining a first queue of addresses corresponding to speculatively executed memory read instructions corresponding to speculative members of a read set;
• maintaining a second queue of addresses corresponding to speculatively executed memory write instructions corresponding to speculative members of a write set;
• performing a transaction interference resolution responsive to receiving a request for data by a remote processor, including determining a potential transaction interference exclusively conflicting with a speculative instruction;
• and
• holding a response to the received request until the speculative instruction is in a state selected from the group of:
• committed and flushed.