Documentation/admin-guide/sysctl/kernel.rst

File Facts

System

Linux kernel

Corpus path

Documentation/admin-guide/sysctl/kernel.rst

Extension

.rst

Size

58820 bytes

Lines

1737

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

===================================
Documentation for /proc/sys/kernel/
===================================

.. See scripts/check-sysctl-docs to keep this up to date


Copyright (c) 1998, 1999,  Rik van Riel <riel@nl.linux.org>

Copyright (c) 2009,        Shen Feng<shen@cn.fujitsu.com>

For general info and legal blurb, please look in
Documentation/admin-guide/sysctl/index.rst.

------------------------------------------------------------------------------

This file contains documentation for the sysctl files in
``/proc/sys/kernel/``.

The files in this directory can be used to tune and monitor
miscellaneous and general things in the operation of the Linux
kernel. Since some of the files *can* be used to screw up your
system, it is advisable to read both documentation and source
before actually making adjustments.

Currently, these files might (depending on your configuration)
show up in ``/proc/sys/kernel``:

.. contents:: :local:


acct
====

::

    highwater lowwater frequency

If BSD-style process accounting is enabled these values control
its behaviour. If free space on filesystem where the log lives
goes below ``lowwater``\ % accounting suspends. If free space gets
above ``highwater``\ % accounting resumes. ``frequency`` determines
how often do we check the amount of free space (value is in
seconds). Default:

::

    4 2 30

That is, suspend accounting if free space drops below 2%; resume it
if it increases to at least 4%; consider information about amount of
free space valid for 30 seconds.


acpi_video_flags
================

See Documentation/power/video.rst. This allows the video resume mode to be set,
in a similar fashion to the ``acpi_sleep`` kernel parameter, by
combining the following values:

= =======
1 s3_bios
2 s3_mode
4 s3_beep
= =======

arch
====

Annotation

• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.