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Generated January 22, 2018

Computer system with heap and card table

Patent Number: 6,845,437

Patent Information

Abstract
A computer system has a heap for storing objects and a card table for tracking updates to objects on the heap, typically for garbage collection purposes. In particular, the heap is divided into segments, each corresponding to a card in the card table, and any update to a segment in the heap triggers a write barrier to mark the corresponding card in the card table. It is important that this write barrier is as efficient as possible to optimize system performance. In some circumstances an object update may be made to an address outside the heap. To ensure that this still properly maps to a card in the card table, the entire memory space is folded cyclically, so that any given memory address corresponds to one, and only one card, in the card table.
Patent Number: 6,845,437
Issue Date: 2005-01-18

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Citations

Patents cited by this patent

Patent Title
6,249,793 Mostly concurrent compaction in a garbage collection system
6,173,294 Method for combining card marking with remembered set for generational garbage collection with more than two generations
6,098,089 Generation isolation system and method for garbage collection
5,953,736 Write barrier system and method including pointer-specific instruction variant replacement mechanism
5,845,298 Write barrier system and method for trapping garbage collection page boundary crossing pointer stores

Patents that cite this patent

Patent Title
8,412,971 Method and apparatus for cache control
8,255,922 Mechanism for enabling multiple processes to share physical memory
8,131,955 Ephemeral garbage collection using a tracking mechanism on a card table to determine marked bundles
7,882,505 Method and apparatus for switching between per-thread and per-processor resource pools in multi-threaded programs
7,650,350 Method and apparatus for concurrently processing remembered sets in a space-incremental garbage collector
7,565,499 Method and apparatus for recording modified reference locations in garbage-collected heap memory
7,412,580 Concurrent incremental garbage collector with a card table summarizing modified reference locations
7,313,566 Method and apparatus for isolating selected heap objects using a faulting address trap
7,284,108 Systems and methods for multiprocessor scalable write barrier
7,272,695 Hot-card caching to avoid excessive remembered-set updating
7,225,439 Combining write-barriers within an inner loop with fixed step
7,058,670 Scalable, space-efficient, parallel remembered-sets
7,039,664 Combining entries in a card object table
6,965,905 Lock-free, parallel remembered sets
6,928,460 Method and apparatus for performing generational garbage collection in a segmented heap

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