We introduced per-worker preserved mark stacks for ParNew and ParallelGC (see JDK-8146989 and JDK-8146991). Both GCs use the PreservedMarks* classes. It'd be worthwhile also changing G1 to use the same classes as the other two to get code parity between all GCs.
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JDK-8146989 Introduce per-worker preserved mark stacks in ParNew
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- Resolved
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JDK-8146991 Introduce per-worker preserved mark stacks in ParallelGC
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- Resolved
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JDK-8152312 ParNew: Restore preserved marks in parallel
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- Resolved
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