Processor Performance Monitoring With Fixed TMA Counters

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Solution Overview

Problem

Current performance monitoring mechanisms in processors lack precision and efficiency in gathering and differentiating performance metrics, particularly in top-down microarchitecture analysis, due to limited programmable counters and inconsistent data collection methods.

Innovation Solution

Implementing a set of fixed counters for high-level performance metrics in processors, reducing the need for multiplexing and providing precise, fast access to performance data, while offloading programmable counters for lower-level events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiplexing is used to monitor multiple performance events with limited programmable counters, then the number of monitorable events increases, but measurement precision and data consistency deteriorate

Engineering Contradiction:

Improvenumber of monitorable eventsVSAvoidperformance data precision

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments performance monitoring into two distinct hierarchical levels: fixed counters dedicated to high-level TMA events and programmable counters for low-level events. This segmentation eliminates multiplexing conflicts by assigning specific counters to specific monitoring levels, ensuring that high-level performance metrics are captured with dedicated resources while low-level events utilize flexible programmable counters.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If programmable counters are used for all performance events, then flexibility in event selection is improved, but device complexity and overhead increase

Engineering Contradiction:

Improveevent selection flexibilityVSAvoidcounter management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides the counter resource pool into two segments: fixed counters for high-level TMA events and programmable counters for low-level events. This segmentation allows the system to maintain flexibility where needed (programmable counters for customizable low-level events) while reducing complexity for critical high-level monitoring (dedicated fixed counters that require no configuration).

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Fixed counters are designed to autonomously monitor high-level TMA events without requiring software configuration or management. The counters automatically track their designated events and generate interrupts when thresholds are reached, eliminating the overhead of manual counter management while maintaining monitoring effectiveness.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If software-based performance monitoring is used, then adaptability in monitoring parameters is improved, but processing speed and responsiveness deteriorate

Engineering Contradiction:

Improvemonitoring parameter flexibilityVSAvoidperformance data collection speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The patent introduces fixed counters as hardware intermediaries between the processor and software performance analysis tools. These counters operate autonomously in hardware, collecting and aggregating high-level TMA event data at processor speed, then presenting processed results to software. This intermediary approach maintains software adaptability while achieving hardware-level speed in data collection.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Measurement precision

If fixed counters are allocated for high-level TMA events, then measurement precision and data consistency are improved, but device complexity increases

Engineering Contradiction:

Improveperformance metric accuracyVSAvoidcounter architecture complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The fixed counters are designed with multi-functionality to monitor multiple high-level TMA events (front-end bound, back-end bound, core bound, memory bound) within a unified architecture. This universal design allows a single counter infrastructure to handle diverse TMA events, reducing overall system complexity compared to having separate dedicated counters for each event type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250278272A1Circuitry and methods for enhanced performance monitoring

Publication Date: 2025.09.04 INTEL CORP

AI summary

Techniques for performance monitoring are described. In certain examples, an apparatus (e.g., a processor) includes a first set of execution circuits of a first type; a second set of execution circuits of a second type different than the first type; an allocation circuit to allocate a first set of one or more ports for the first set of execution circuits of the first type, and a second set of one or more ports for the second set of execution circuits of the second type; and a performance monitor circuit to generate a first value that indicates a first number of ports of the first set of one or more ports that delayed pushing out a ready to execute micro-operation of the first type to the first set of execution circuits of the first type due to being busy executing another micro-operation of the first type, and a second value that indicates a second number of ports of the second set of one or more ports that delayed pushing out a ready to execute micro-operation of the second type to the second set of execution circuits of the second type due to being busy executing another micro-operation of the second type.