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136799e52c
Add documentation for the Xen hypervisor sysctl controls in /proc/sys/xen/balloon/. Documents the hotplug_unpopulated tunable (available when CONFIG_XEN_BALLOON_MEMORY_HOTPLUG is enabled) which controls whether unpopulated memory regions are automatically hotplugged when the Xen balloon driver needs to reclaim memory. The documentation is based on source code analysis of drivers/xen/balloon.c. Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260304150419.16738-1-chakrabortyshubham66@gmail.com>
108 lines
3.3 KiB
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108 lines
3.3 KiB
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===========================
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Documentation for /proc/sys
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===========================
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Copyright (c) 1998, 1999, Rik van Riel <riel@nl.linux.org>
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------------------------------------------------------------------------------
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'Why', I hear you ask, 'would anyone even _want_ documentation
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for them sysctl files? If anybody really needs it, it's all in
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the source...'
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Well, this documentation is written because some people either
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don't know they need to tweak something, or because they don't
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have the time or knowledge to read the source code.
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Furthermore, the programmers who built sysctl have built it to
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be actually used, not just for the fun of programming it :-)
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------------------------------------------------------------------------------
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Legal blurb:
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As usual, there are two main things to consider:
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1. you get what you pay for
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2. it's free
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The consequences are that I won't guarantee the correctness of
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this document, and if you come to me complaining about how you
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screwed up your system because of wrong documentation, I won't
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feel sorry for you. I might even laugh at you...
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But of course, if you _do_ manage to screw up your system using
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only the sysctl options used in this file, I'd like to hear of
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it. Not only to have a great laugh, but also to make sure that
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you're the last RTFMing person to screw up.
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In short, e-mail your suggestions, corrections and / or horror
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stories to: <riel@nl.linux.org>
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Rik van Riel.
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--------------------------------------------------------------
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Introduction
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============
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Sysctl is a means of configuring certain aspects of the kernel
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at run-time, and the /proc/sys/ directory is there so that you
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don't even need special tools to do it!
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In fact, there are only four things needed to use these config
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facilities:
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- a running Linux system
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- root access
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- common sense (this is especially hard to come by these days)
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- knowledge of what all those values mean
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As a quick 'ls /proc/sys' will show, the directory consists of
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several (arch-dependent?) subdirs. Each subdir is mainly about
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one part of the kernel, so you can do configuration on a piece
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by piece basis, or just some 'thematic frobbing'.
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This documentation is about:
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=============== ===============================================================
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abi/ execution domains & personalities
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<$ARCH> tuning controls for various CPU architecture (e.g. csky, s390)
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crypto/ cryptographic subsystem
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debug/ debugging features
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dev/ device specific information (e.g. dev/cdrom/info)
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fs/ specific filesystems
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filehandle, inode, dentry and quota tuning
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binfmt_misc <Documentation/admin-guide/binfmt-misc.rst>
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kernel/ global kernel info / tuning
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miscellaneous stuff
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some architecture-specific controls
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security (LSM) stuff
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net/ networking stuff, for documentation look in:
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<Documentation/networking/>
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proc/ <empty>
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sunrpc/ SUN Remote Procedure Call (NFS)
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user/ Per user namespace limits
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vm/ memory management tuning
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buffer and cache management
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xen/ Xen hypervisor controls
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=============== ===============================================================
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These are the subdirs I have on my system or have been discovered by
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searching through the source code. There might be more or other subdirs
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in another setup. If you see another dir, I'd really like to hear about
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it :-)
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.. toctree::
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:maxdepth: 1
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abi
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crypto
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debug
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fs
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kernel
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net
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sunrpc
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user
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vm
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xen
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