JDK-8252041 : G1: Fix incorrect uses of HeapRegionManager::max_length
- Type: Bug
- Component: hotspot
- Sub-Component: gc
- Affected Version: 16
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2020-08-19
- Updated: 2020-09-29
- Resolved: 2020-09-17
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| JDK 16 |
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16 b17Fixed  |
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Description
Since the implementation of JDK-8171181 JEP 316: Heap Allocation on Alternative Memory Devices there are two notions of maximum number of regions in the heap in HeapRegionManager: max_length(): maximum number of regions in the entire reserved area of the heap (to be used for sizing for arrays etc.) max_expandable_length(): maximum number of regions g1 is allowed to commit. There are some wrong uses of both. This is not an issue for regular G1 as both are the same, but a problem when having a larger reserved space than committable (e.g. with that feature enabled). There are also some missing bounds checks in the code assuming max_length == max_expandable_length. Fix this (and users of HeapRegionManager::max_length/max_expandable_length)
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