Trace Assist Unit Buffering Multi-Core Processor Events
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Solution Overview
Problem
Modern computing systems with multiple processor cores generate a significant amount of trace data during program execution, which can exceed tens or hundreds of megabytes per second, posing a challenge in efficiently managing and processing this data.
Innovation Solution
A hardware-based trace assist unit (TAU) is introduced, comprising physical buffers, loading circuitry, and unloading circuitry. The TAU receives trace events from multiple processor cores, categorizes them, and writes them to assigned physical buffers. When conditions are met, it unloads the contents of these buffers to an external memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If processor tracing records detailed execution paths with timestamps, then measurement precision is improved, but the quantity of trace data generated increases exponentially
Solution Approach 1:
The patent segments trace data into multiple categories (e.g., branch traces, memory accesses, pipeline events) and uses separate physical buffers for each category. This segmentation allows the system to manage large volumes of trace data more efficiently by processing and storing different types of data in dedicated buffers, reducing the overhead of managing a single large buffer while maintaining high measurement precision across all trace types.
2Productivity
If multiple physical buffers are used to categorize trace events, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent implements a unified buffer management system that handles multiple categories of trace events through a common interface and control logic. The loading circuitry and unloading circuitry serve universal functions across all physical buffers, managing categorization, loading, and unloading operations in a standardized manner. This multi-functional approach increases processing throughput while keeping the added complexity manageable through reuse of common control mechanisms.
3Loss of time
If trace data is stored in physical buffers before external memory, then loss of time is reduced, but use of energy increases
Solution Approach 1:
The patent uses physical buffers to pre-load and pre-organize trace data in categorized groups before transferring to external memory. By performing preliminary categorization and buffering of trace events, the system reduces the time required for subsequent data retrieval and analysis operations. The buffers act as a staging area that prepares data in advance, reducing access latency while managing energy consumption through efficient batch operations.
Data Source
AI summary
A trace assist unit operable with a plurality of processor cores is described. The trace assist unit comprises a plurality of physical buffers, and loading circuitry and unloading circuitry that are communicatively coupled with the plurality of physical buffers. The loading circuitry receives trace events from various ones of the plurality of processor cores, each of the trace events having a respective category from a plurality of predefined categories. The loading circuitry writes the trace events to respective ones of the plurality of physical buffers that are assigned to the respective categories of the plurality of predefined categories. The loading circuitry transmits, responsive to one or more predefined conditions, an unload signal to the unloading circuitry to unload contents of a selected physical buffer of the plurality of physical buffers to an external memory.