JDK-8245022 : ParallelGC abuses StarTask to also include partial objarray scan tasks
- Type: Enhancement
- Component: hotspot
- Sub-Component: gc
- Affected Version: 15
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2020-05-14
- Updated: 2020-05-28
- Resolved: 2020-05-20
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| JDK 15 |
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15 b25Fixed  |
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Description
Similarly to G1 (JDK-8244684), ParallelGC young collections also use a compact representation of partial objarray scans, so that normal object scan tasks (oop* and narrowOop*) and partial objarray scan tasks can co-exist in the same taskqueue. And similarly to what was described in JDK-8244684, ParallelGC has its own similar private mechanism for doing so which similarly involves casting between oop and oop* and using misaligned oop* values. JDK-8244684 provided a cleaner mechanism in shared code and used by G1. ParallelGC should be similarly changed to use the new shared mechanism.
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