Madvise uses the madvise system call to give advise about the use of memory when using a slice that is memory-mapped to a file.

Mmap uses the mmap system call to memory-map a file.

Msync would call sync on the mmapped data.

Munmap unmaps a previously mapped slice.

OpenMmapFile opens an existing file or creates a new file.

MmapFile represents an mmapd file and includes both the buffer to the data and the file descriptor.