Dynamic User-Space Process Tuning via Symbol Address Modification
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Solution Overview
Problem
Existing methods for dynamic tuning of user-space components, such as environment variables and shared memory segments, are ineffective as they either affect all programs or are resource-intensive, and are not suitable for system shared libraries.
Innovation Solution
A method that attaches to a user-space process to read and write the effective address of a symbol, allowing for dynamic tuning without affecting other processes or requiring resource-intensive shared memory allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If environment variables are used to tune application behavior, then all programs in the environment can be tuned, but it is impossible to dynamically tune a specific instance without affecting other programs using the same variable
Solution Approach 1:
The patent segments the tuning mechanism from the global environment variable space into process-specific memory space. By attaching to a specific process and modifying symbols directly in that process's address space, the tuning effect is isolated to only the target process, eliminating side effects on other programs while maintaining the ability to tune application behavior.
Solution Approach 2:
The patent introduces an intermediary mechanism (process attachment and symbol resolution) between the tuning tool and the target application. This intermediary allows precise targeting of specific process instances through process ID and symbol name, enabling selective tuning without affecting other processes that may use the same environment variables.
2Adaptability or versatility
If shared memory segments are allocated for dynamic tuning, then specific instances can be tuned, but resource consumption increases and it is not well suited for system shared libraries
Solution Approach 1:
The patent leverages the existing process memory space and symbol table infrastructure that every process already has. Instead of allocating additional shared memory segments, the tuning mechanism uses the process's own memory space and symbol resolution capabilities, eliminating the need for extra resource allocation while achieving instance-specific tuning.
Solution Approach 2:
The patent makes the existing process memory and symbol table infrastructure serve dual purposes: both normal program execution and dynamic tuning. By using the same memory space and symbol resolution mechanisms that processes already utilize, the solution avoids creating separate tuning-specific resources while achieving the same functional goals.
3Adaptability or versatility
If signals are sent to trigger configuration reading, then dynamic tuning can be achieved, but signals cannot be used for other application needs and it is not practical for system shared libraries
Solution Approach 1:
The patent extracts the configuration data reading mechanism from the signal-triggered approach and integrates it directly into the process attachment operation. Instead of using signals to asynchronously trigger configuration updates, the tuning tool directly reads and modifies symbol values in the target process's memory space during attachment, eliminating the need for signal handling infrastructure.
Data Source
AI summary
One embodiment relates to a method for dynamic tuning of a user-space process. The method attaches to the user-space process. Load-time and compile-time base addresses of a data section of an object to be tuned are read. An offset to a symbol to be tuned is determined, and an effective address of the symbol is computed. A new value of the symbol is then written. Other embodiments and features are also disclosed.