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runtime (gc_blocks.go): implement thread-local stack scanning#5113
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This change allows all thread stacks to be scanned in parallel.Each thread marks all objects reachable from its stack, using a thread-local scan list.The marking code now uses atomics to access GC metadata.If multiple threads try to mark the same object, the first one will responsible for scanning it.
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niaow commentedDec 6, 2025
Leaving this as a draft because it is still pretty inefficient and needs more work. |
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This change allows all thread stacks to be scanned in parallel. Each thread marks all objects reachable from its stack, using a thread-local scan list.
The marking code now uses atomics to access GC metadata. If multiple threads try to mark the same object, the first one will responsible for scanning it.