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Write Barrier — Glossary | LowLevelCraft

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Glossary Term

Write Barrier

A small code sequence the compiler inserts on pointer stores so the garbage collector can track cross-generation or concurrent mutations.

Generational and concurrent GCs (V8, HotSpot, Go) depend on write barriers; Go's sub-millisecond pauses are built on them.

Related Terms

Heap Garbage Collection

Used In

Implement Generational Garbage Collection Implement Write Barriers for GC Understand Concurrent Garbage Collection Understand JVM GC: G1 Regions, Remembered Sets, SATB Barriers How Garbage Collectors Actually Work