Thread-Local Garbage Collection Selection for Shared Object Accessibility
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Solution Overview
Problem
Existing garbage collection processes in runtime environments face inefficiencies in reclaiming memory that is no longer in use or accessible, leading to memory leaks and suboptimal resource utilization.
Innovation Solution
A system selects a garbage collection process based on whether a thread has encountered shared objects in a private memory region, employing sweeping thread-local garbage collection for threads with exclusive memory and selective garbage collection for threads with shared objects, ensuring efficient memory reclamation without affecting accessibility by other threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sweeping thread-local garbage collection process is used to reclaim memory efficiently, then memory reclamation speed is improved, but shared objects in private memory regions may be incorrectly reclaimed and become inaccessible to other threads
Solution Approach 1:
The patent segments the memory management approach by implementing two distinct garbage collection processes: sweeping thread-local garbage collection for threads with exclusive memory regions, and selective garbage collection for threads that may have shared objects. This segmentation allows the system to apply the appropriate collection strategy based on the thread's memory access patterns, thereby resolving the contradiction between reclamation speed and object accessibility.
Solution Approach 2:
The patent introduces dynamic selection of garbage collection processes based on runtime conditions. The system determines whether a thread has encountered shared objects in private memory regions and dynamically switches between sweeping and selective garbage collection approaches. This dynamic adaptation enables the system to optimize for speed when safe and ensure accessibility when shared objects are present.
2Reliability
If selective garbage collection is used to preserve shared object accessibility, then object accessibility is maintained, but memory reclamation efficiency decreases compared to sweeping collection
Solution Approach 1:
The patent divides the garbage collection functionality into two specialized processes: selective garbage collection that preserves shared object accessibility, and sweeping thread-local garbage collection that optimizes for speed. By segmenting the collection strategies, the system can apply selective collection only when necessary (when shared objects are detected), thereby maintaining reliability without permanently sacrificing productivity.
Solution Approach 2:
The system dynamically selects between selective and sweeping garbage collection based on whether shared objects are detected in private memory regions. When no shared objects are present, the faster sweeping collection is used; when shared objects are detected, the system switches to selective collection. This dynamic approach minimizes the impact on reclamation speed while ensuring accessibility when needed.
3Device complexity
If traditional garbage collection is used without thread-local differentiation, then implementation simplicity is maintained, but memory leaks occur due to inadequate reclamation of unused memory
Solution Approach 1:
The patent segments the garbage collection approach into thread-local sweeping collection and selective collection, allowing each thread to have its memory managed appropriately. This segmentation enables effective memory reclamation without requiring complete system-wide complexity, as each thread's collection strategy is determined independently based on its own memory access patterns.
Solution Approach 2:
The patent implements self-service garbage collection where each thread's memory is managed according to its own characteristics. Threads that exclusively use private memory regions benefit from automatic sweeping collection, while threads that access shared objects trigger selective collection. This self-service approach effectively prevents memory leaks without requiring complex centralized control for every memory operation.
Data Source
AI summary
A system executes a first virtual thread, including storing a first shared object in a first private memory region, storing a pointer in a shared memory region, and determining that the pointer includes a reference to a location of the first shared object in the first private memory region. Responsive to determining that the pointer includes the reference, the system designates the first virtual thread as disqualified from eligibility for execution of a sweeping thread-local garbage collection process and augments the pointer to indicate that the pointer includes the reference to the location of the first shared object. The system executes a second virtual thread, including loading the pointer and determining that the pointer has been augmented. Responsive to determining that the pointer has been augmented, the system designates the second virtual thread as disqualified from eligibility for execution of the sweeping thread-local garbage collection process.