JDK-8255254 : Split os::reserve_memory and os::map_memory_to_file interfaces
- Type: Enhancement
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 16
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2020-10-22
- Updated: 2021-11-02
- Resolved: 2020-10-27
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| JDK 16 |
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16 b22Fixed  |
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Description
reserve_memory and map_memory_to_file are substantially different interfaces. Reserve expects subsequent commit/uncommit and is removed by release_memory. Map_memory_to_file does not allow commit/uncommit and is removed by os::unmap_memory. But for now, some os::*reserve_memory* functions take file descriptor parameter[1] and, if it is valid descriptor, act effectively as map_memory_to_file[2]. Callers are aware that commit/uncommit cannot be called for reserved-with-fd memory[3]. Callers are also know about different ways to remove the mapping[4]. The suggestion is to make clear distinctions between reserve_memory and map_memory_to_file interfaces [1] https://github.com/openjdk/jdk/blob/4634dbe/src/hotspot/share/runtime/os.hpp#L321 [2] https://github.com/openjdk/jdk/blob/4634dbe/src/hotspot/share/runtime/os.cpp#L1667 [3] https://github.com/openjdk/jdk/blob/4634dbe/src/hotspot/share/memory/virtualspace.cpp#L225 [4]https://github.com/openjdk/jdk/blob/4634dbe/src/hotspot/share/memory/virtualspace.cpp#L84
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