===================================
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
====
The machine hardware name, the same output as ``uname -m``
(e.g. ``x86_64`` or ``aarch64``).
auto_msgmni
===========
This variable has no effect and may be removed in future kernel
releases. Reading it always returns 0.
Up to Linux 3.17, it enabled/disabled automatic recomputing of
`msgmni`_
upon memory add/remove or upon IPC namespace creation/removal.
Echoing "1" into this file enabled msgmni automatic recomputing.
Echoing "
| 