Cache Agent Eviction Priority Management for SoC Interoperability

The patent introduces a parameter change mechanism where eviction messages carry priority indicators (high priority or low priority) that can be dynamically adjusted based on the receiving agent's capabilities. This allows the system to adapt the behavior of eviction operations to match different cache coherence policies without requiring agents to implement all possible policy combinations, thus resolving the contradiction between adaptability and reliability.

The patent employs an intermediary mechanism in the form of priority conversion logic that acts as a mediator between agents with different prioritization policies. When an agent receives an eviction message with a priority level it doesn't natively support, the intermediary converts the message to a compatible priority level, enabling reliable interoperability while maintaining the adaptability of diverse cache coherence policies.

The patent segments the eviction operation into distinct priority levels (high priority and low priority) with clearly defined behaviors. High-priority evictions are interruptible by probes, while low-priority evictions are not. This segmentation simplifies the management complexity by providing clear rules for each level rather than requiring complex arbitration logic for all possible scenarios.

The patent introduces dynamic priority assignment where the priority of an eviction operation can change based on the receiving agent's capabilities and the current operational context. This dynamic approach allows the system to maintain data safety through high-priority evictions when needed while avoiding unnecessary complexity by using low-priority evictions when safe, thus managing complexity through intelligent adaptation rather than rigid fixed rules.