Service Co-Processor Address Space for Diagnostic Data Collection
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Solution Overview
Problem
Current computing systems face significant delays and secondary issues during system dumps, leading to unresponsive systems, lost diagnostic information, and increased service costs due to the performance overhead of diagnostic tools like system tracing, which often necessitate disabling critical diagnostic functions in production environments.
Innovation Solution
A service co-processor with a service address space is introduced, allowing for asynchronous processing of diagnostic functions by maintaining an independent copy of the main address space, reducing the load on the main processor and enabling efficient diagnostic data collection through separate instruction and command pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a system dump is carried out to access address space contents for diagnostic purposes, then diagnostic information is obtained, but processing delays occur causing system unresponsiveness and secondary problems
Solution Approach 1:
The system is segmented into a main processor and a service co-processor. The main processor continues normal operations while the service co-processor handles diagnostic dump operations independently using its own service address space, eliminating the processing delay on the main system.
Solution Approach 2:
A service co-processor acts as an intermediary between the main processor and diagnostic tools. It receives dump requests, performs the actual diagnostic operations in its own address space, and returns results without blocking the main processor's execution flow.
2Loss of information
If system tracing is enabled to capture diagnostic data at pre-defined points, then diagnostic coverage is improved, but performance overhead increases making it non-viable in production systems
Solution Approach 1:
Tracing functionality is segmented into the service co-processor's address space. Trace records are written to the service address space without interfering with main processor performance, allowing full tracing capability in production environments.
Solution Approach 2:
The service co-processor maintains a copy of the address space structure (service address space) that mirrors the main address space. This allows trace records to be captured and stored without modifying or blocking access to the actual system memory, eliminating performance overhead.
3Device complexity
If the main processor handles all diagnostic service functions directly, then device complexity is minimized, but processing delays and system unresponsiveness occur
Solution Approach 1:
Diagnostic service functions are extracted from the main processor and assigned to a dedicated service co-processor. This separates diagnostic operations from normal processing, allowing the main processor to maintain minimal complexity while diagnostic functions execute independently without causing delays.
Data Source
AI summary
A system and technique are provided for providing a service address space. The system includes a service co-processor provided with a service address space. The service co-processor is attached to a main processor where the main processor is provided with a main address space. The service co-processor creates and maintains an independent copy of the main address space in the form of the service address space. The service co-processor receives from the main processor a command packet, determines a clock value for initiating a service function designated by the command packet, and updates the service address space until reaching the clock value. The service co-processor then performs the service function at the clock value.