Hierarchical Metadata Predictor Eviction Handling
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Solution Overview
Problem
Existing computer systems lack an efficient method for ensuring that updated metadata from a first-level structure is written into a second-level structure upon eviction, leading to performance issues in metadata prediction.
Innovation Solution
An integrated semi-inclusive hierarchical metadata predictor is implemented, which determines hits in a second-level structure and stores victim lines of metadata from a first-level structure based on conditions such as updates or absence, facilitating direct integration into the prediction pipeline and ensuring updated content is preserved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a first-level metadata structure is used for fast access, then prediction speed is improved, but updated metadata may be lost when content is evicted without being written to a second-level structure
Solution Approach 1:
The patent introduces a hierarchical two-level metadata structure (first-level and second-level structures) to resolve the contradiction. The first-level structure provides fast access for immediate predictions, while the second-level structure serves as a backup repository that receives evicted metadata through a store-victim mechanism. This dimensional expansion from single-level to multi-level architecture allows the system to maintain both speed and information integrity simultaneously.
Solution Approach 2:
The patent implements a store-victim mechanism that proactively transfers metadata from the first-level to the second-level structure before the first-level structure runs out of space. This preliminary action ensures that updated metadata is preserved in the second-level structure before eviction occurs, preventing information loss while maintaining fast access capabilities in the first-level structure.
2Reliability
If metadata is frequently transferred between structures to ensure updates are preserved, then information integrity is improved, but system complexity and overhead increase
Solution Approach 1:
The store-victim mechanism operates autonomously based on simple conditions: when the first-level structure needs to evict metadata, it automatically checks whether the evicted line should be stored in the second-level structure and performs the transfer without complex coordination. This self-service approach maintains metadata integrity through a straightforward, condition-based mechanism rather than complex centralized control.
Solution Approach 2:
The patent applies different qualities to different levels of the metadata structure. The first-level structure is optimized for fast access with simple organization, while the second-level structure serves as a supplementary repository with different access characteristics. This local quality differentiation allows each level to be optimized for its specific function, reducing overall system complexity while maintaining reliability.
3Measurement precision
If all metadata lines are maintained in both first-level and second-level structures, then prediction accuracy is improved, but memory usage and processing overhead increase
Solution Approach 1:
Instead of maintaining all metadata in both structures simultaneously (excessive action), the patent uses partial action by selectively transferring only the evicted metadata lines to the second-level structure based on the store-victim mechanism. This partial approach ensures that the most recently updated metadata is preserved in the second-level structure while avoiding redundant storage of all metadata across both levels, thus balancing prediction accuracy with resource efficiency.
Data Source
AI summary
Embodiments are provided for an integrated semi-inclusive hierarchical metadata predictor. A hit in a second-level structure is determined, the hit being associated with a line of metadata in the second-level structure. Responsive to determining that a victim line of metadata in a first-level structure meets at least one condition, the victim line of metadata is stored in the second-level structure. The line of metadata from the second-level structure is stored in a first-level structure to be utilized to facilitate performance of a processor, the line of metadata from the second-level structure including entries for a plurality of instructions.