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Type:
Enhancement
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Resolution: Fixed
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Priority:
P4
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Affects Version/s: 8-shenandoah, 11-shenandoah, 14, 15
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Component/s: hotspot
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b16
| Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
|---|---|---|---|---|---|---|
| JDK-8243263 | 14.0.2 | Aleksey Shipilev | P4 | Resolved | Fixed | b04 |
Current fragmentation computations have flaws:
- fragmentation metrics are there to drive mutator behavior, but it captures evac-reserve;
- external fragmentation do not count humongous objects spanning a single region
- external fragmentation takes "total space" over all regions, while using "free space" only for completely empty ones
These make gc/oom/TestThreadFailure.java fail withJDK-8241139 changes.
- fragmentation metrics are there to drive mutator behavior, but it captures evac-reserve;
- external fragmentation do not count humongous objects spanning a single region
- external fragmentation takes "total space" over all regions, while using "free space" only for completely empty ones
These make gc/oom/TestThreadFailure.java fail with
- backported by
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JDK-8243263 Shenandoah: fragmentation metrics overhaul
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- Resolved
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- blocks
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JDK-8241139 Shenandoah: distribute mark-compact work exactly to minimize fragmentation
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- Resolved
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