Memory Management — The Linux Kernel 5.18.5-gnu-1 documentation

# Memory Management

Linux memory management subsystem is responsible, as the name implies, for managing the memory in the system. This includes implementation of virtual memory and demand paging, memory allocation both for kernel internal structures and user space programs, mapping of files into processes address space and many other cool things.

Linux memory management is a complex system with many configurable settings. Most of these settings are available via `/proc` filesystem and can be quired and adjusted using `sysctl`. These APIs are described in Documentation for /proc/sys/vm/ and in man 5 proc.

Linux memory management has its own jargon and if you are not yet familiar with it, consider reading Documentation/admin-guide/mm/concepts.rst.

Here we document in detail how to interact with various mechanisms in the Linux memory management.

- Concepts overview
- CMA Debugfs Interface
- Monitoring Data Accesses
- HugeTLB Pages
- Idle Page Tracking
- Kernel Samepage Merging
- Memory Hot(Un)Plug
- No-MMU memory mapping support
- NUMA Memory Policy
- NUMA Locality
- NUMA Performance
- NUMA Cache
- See Also
- Examining Process Page Tables
- Soft-Dirty PTEs
- Automatically bind swap device to numa node
- Transparent Hugepage Support
- Userfaultfd
- zswap