Object Publishing Mechanism for Concurrent Garbage Collection
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Solution Overview
Problem
Existing memory management systems face challenges in concurrent garbage collection and object allocation, leading to performance degradation and potential security vulnerabilities due to the need for explicit memory management and the time-consuming nature of garbage collection processes.
Innovation Solution
Implementing a mechanism where an allocator thread indicates when an object is in an unexaminable state and publishes it for examination by the garbage collector, allowing concurrent garbage collection and object allocation while minimizing performance impact and security risks by using APIs to manage locking and unlocking of memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If garbage collection activities are performed while allowing other processes to continue, then performance degradation is reduced, but memory accessibility and security may be compromised
Solution Approach 1:
The patent implements dynamic state transitions for memory objects between locked and unlocked states. Objects can be locked during allocation to prevent garbage collection, then unlocked when ready for collection. This dynamic control allows the system to balance between allowing concurrent garbage collection (improving productivity) and maintaining memory security (preventing premature collection) based on the object's readiness state.
Solution Approach 2:
The patent introduces an intermediary publishing mechanism that acts as a mediator between the allocator thread and garbage collection threads. The allocator publishes objects in an unlocked state when they are ready for collection, and can republish them in a locked state when they need protection. This intermediary publishing system enables safe concurrent access without compromising security or performance.
2Productivity
If multiple garbage collection threads operate concurrently, then garbage collection efficiency is improved, but performance degradation occurs when threads block each other during memory clearing
Solution Approach 1:
The patent segments the memory management space into individual object-level locks rather than requiring global locks. Each memory object can be independently locked or unlocked, allowing multiple garbage collection threads to operate concurrently on different objects without blocking each other. This segmentation enables parallel garbage collection (improving efficiency) while minimizing contention (reducing performance degradation).
3Ease of operation
If explicit memory management commands are used, then memory allocation and deallocation are controlled, but free memory becomes scattered and security vulnerabilities increase
Solution Approach 1:
The patent implements automatic memory management where the system itself manages memory allocation and deallocation without requiring explicit user commands. The garbage collection system automatically identifies and collects unused memory, eliminating the need for manual free commands. This self-service approach prevents scattered free memory (improving reliability) while maintaining ease of operation through automatic management.
Data Source
AI summary
Publishing an object. Memory for an object may be reserved so as to lock the memory from being access by garbage collection threads or other user threads. While the lock is in place, type and size information can be installed for the object. If the reservation is being made to allow garbage collection threads to operate on the object, then the type may be a specialized type that indicates that the object has no references. Reservations can also be made to allow the intended type information to be installed for the object. An indication can be made that the object is well formed, thus unlocking the object and allowing garbage collection threads, other user threads, or both to access the object. The locking and unlocking may be performed by accessing an API provided by a system garbage collector.