Pauseless Garbage Collection via Shadow Pointer Translation
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Solution Overview
Problem
Conventional garbage collection processes in computing environments require applications to pause execution, causing interruptions that are detrimental for time-sensitive tasks due to the need to validate object pointers during memory consolidation, leading to inefficiencies and performance issues.
Innovation Solution
An optimized garbage collection method that allows applications to continue executing without interruption by using a load instruction to identify and modify object pointers within memory areas undergoing garbage collection, utilizing a lightweight interrupt handler to update pointers without requiring special instructions or program modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional garbage collection is performed on an object storage area, then memory consolidation and object relocation are achieved, but applications are required to pause execution to validate object pointers
Solution Approach 1:
The system performs preliminary actions by establishing a shadow pointer storage area and pre-configuring translation mechanisms before garbage collection begins. Applications continue to access objects using original pointers while a parallel structure is prepared to handle pointer translations during consolidation, eliminating the need for execution pauses.
Solution Approach 2:
A shadow pointer storage area and translation mechanism are introduced as intermediaries between applications and the object storage area. When objects are relocated during garbage collection, the translation mechanism automatically updates shadow pointers without requiring applications to pause or validate pointers manually.
2Reliability
If applications pause execution during garbage collection to validate pointers, then pointer correctness is ensured, but time-sensitive tasks cannot be performed
Solution Approach 1:
The shadow pointer storage area and translation mechanism operate autonomously without requiring application intervention. The system self-manages pointer validation and translation during garbage collection, allowing applications to continue executing time-sensitive tasks without interruption while pointer correctness is maintained through automatic updates.
3Measurement precision
If special instructions or program modifications are used to handle pointer updates during garbage collection, then precise pointer management is achieved, but system complexity increases
Solution Approach 1:
The shadow pointer storage area and translation mechanism are designed as universal structures that work with existing load instructions without requiring special-purpose instructions or program modifications. The same load instructions used for normal memory access automatically trigger pointer translation when accessing the shadow storage area, simplifying the system while maintaining precise pointer management.
Data Source
AI summary
Garbage collection processing is facilitated. Based on execution of a load instruction and determining that an address of an object pointer to be loaded is located in a pointer storage area and the object pointer indicates a location within a selected portion of memory undergoing garbage collection, processing control is obtained by a handler executing within a processor of the computing environment. The handler obtains the object pointer from the pointer storage area, and determines whether the object pointer is to be modified. If the object pointer is to be modified, the handler modifies the object pointer. The handler may then store the modified object pointer in a selected location.