Method and apparatus for implementing a write barrier of a garbage collected heap
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United States of America Patent
Stats
-
Apr 11, 2000
Grant Date -
N/A
app pub date -
Apr 23, 1997
filing date -
Apr 23, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus, methods, systems and computer program products are disclosed describing a data structure and associated processes that optimize garbage collection. The invention sections a card vector associated with a card marked heap into portions. Each portion can be individually write protected. A section vector contains section data structures that are used to control their respective portions. When a write-barrier executes and attempts to mark a card marker in a read-only portion of the card vector, the invention traps the mark operation, sets the portion to read-write, changes the status of the section data structure and completes the mark operation. When a garbage collection phase scans the heap during the garbage collection process, it skips over portions of the card vector associated with sections having a read-only status--thus, improving the garbage collection process.
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