mmap-allocator 0.3.1

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# mmap-allocator

`mmap-allocator` declares struct `MmapAllocator` and function 'page\_size' for 'unix' or 'linux' platform.

`MmapAllocator` implements `std::alloc::GlobalAlloc` whose backend is 'posix mmap'.

'page\_size' returns OS page size.
('unix' and 'linux' os pass memory to a process by multipile of page size; if a process
requires 32 bytes heap memory and if the OS page size is 4096 bytes, OS passes 4096 bytes
memory chunk. Usually 'malloc' deals it to use memory effectively.)

License: Apache-2.0 OR LGPL-3.0-or-later