Mmap

What are Memory-Mapped Files?

A memory-mapped file is a file whose contents are mapped directly into a process’s virtual address space via the page cache, so the program reads and writes th…

Page Cache vs Buffer Cache: What Is the Difference?

The page cache caches file contents in memory indexed by file and byte offset (used for regular file reads, writes, and mmap()), while the buffer cache histori…

What Does the mmap() System Call Do?

mmap() maps a file (or anonymous memory) directly into a process’s virtual address space, so the program can read and write the file’s contents using ordinary…