JDK-8224584 : Shenandoah: Eliminate forwarding pointer word
- Type: Enhancement
- Component: hotspot
- Sub-Component: gc
- Affected Version: 8-shenandoah,11-shenandoah,13
- Priority: P3
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2019-05-22
- Updated: 2020-07-09
- Resolved: 2019-05-29
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Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 13 | JDK 14 |
|---|---|
13 b23Fixed  |
14Fixed |
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JDK-8225530 :
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Description
Shenandoah uses an extra word per object to store the forwarding pointer of an object in support of concurrent evacuation. With the arrival of load reference barriers, it is possible to store the forwarding pointer in the then-unused memory of from-space-copy of an object instead, for example use the from-space-mark-word and encode the forwarding pointer there. This allows to eliminate the extra forwarding pointer word, and thus reduces memory footprint, and gives the GC and application more headroom to work with.
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