Prioritized conflict handling in a system

摘要

A controller has a cache to store data associated with an address that is subject to conflict resolution. A conflict resolution queue stores information relating to plural transactions, and logic reprioritizes the plural transactions in the conflict resolution queue to change a priority of a first type of transaction with respect to a priority of second type of transaction.

主权项

1. A method, comprising:
receiving an incoming transaction; determining if the incoming transaction has an address conflict with any in-progress transaction or a pending transaction in a conflict resolution queue; if the incoming transaction has an address conflict and is a remote write transaction, processing the incoming transaction; if the incoming transaction has an address conflict and is not a remote write transaction, adding the incoming transaction to the conflict resolution queue; for each respective transaction in the conflict resolution queue, including the incoming transaction:
if the respective transaction does not have an address conflict with any in-progress transaction and the respective transaction is not a local snoop transaction, processing the respective transaction;if the respective transaction is a local snoop transaction and a defer time of the local snoop transaction is greater than a threshold or there is no conflicting read transaction in the conflict resolution queue, processing the respective transaction; andif the respective transaction is a local snoop transaction and the defer time of the local snoop transaction is less than the threshold and there is a conflicting read transaction in the conflict resolution queue, incrementing the defer time of the respective transaction and retaining the respective transaction in the conflict resolution queue.