JDK-7132690 : InstanceKlass::_reference_type should be u1 type
- Type: Enhancement
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 8
- Priority: P4
- Status: Closed
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2012-01-24
- Updated: 2012-10-13
- Resolved: 2012-02-11
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| JDK 7 | JDK 8 | Other |
|---|---|---|
7u4Fixed  |
8Fixed |
hs23Fixed |
Description
The ReferenceType is defined as an enum with 6 values (src/share/vm/utilities/globalDefinitions.hpp). The InstanceKlass::_reference_type is an int type. It can be reduced to u1 type. Move the field within InstanceKlass to utilize unused memory can save 4-byte for each class.
Comments
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