JDK-8256155 : Allow multiple large page sizes to be used on Linux
- Type: Enhancement
- Component: hotspot
- Sub-Component: gc
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: linux
- Submitted: 2020-11-10
- Updated: 2024-02-06
- Resolved: 2021-05-21
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| JDK 17 |
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17 b24Fixed  |
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Description
When using LargePageSizeInBytes=1G, os::Linux::reserve_memory_special_huge_tlbfs* cannot select large pages smaller than 1G. Code heap usually uses less than 1G, so currently the code precludes code heap from using Large pages in this circumstance and when os::Linux::reserve_memory_special_huge_tlbfs* is called page sizes fall back to Linux::page_size() (usually 4k). This change allows the above use case by populating all large_page_sizes present in /sys/kernel/mm/hugepages in _page_sizes upon calling os::Linux::setup_large_page_size(). In os::Linux::reserve_memory_special_huge_tlbfs* we then select the largest large page size available in _page_sizes that is smaller than bytes being reserved.
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