nixos: nixos/doc/manual/configuration/linux-kernel.xml to CommonMark
This commit is contained in:
Bobby Rong
parent
35f476e8b9
commit
747c61066c
@ -22,7 +22,7 @@
|
||||
<xi:include href="../from_md/configuration/gpu-accel.chapter.xml" />
|
||||
<xi:include href="../from_md/configuration/xfce.chapter.xml" />
|
||||
<xi:include href="networking.xml" />
|
||||
<xi:include href="linux-kernel.xml" />
|
||||
<xi:include href="../from_md/configuration/linux-kernel.chapter.xml" />
|
||||
<xi:include href="subversion.xml" />
|
||||
<xi:include href="../generated/modules.xml" xpointer="xpointer(//section[@id='modules']/*)" />
|
||||
<xi:include href="profiles.xml" />
|
||||
|
||||
135
nixos/doc/manual/configuration/linux-kernel.chapter.md
Normal file
135
nixos/doc/manual/configuration/linux-kernel.chapter.md
Normal file
@ -0,0 +1,135 @@
|
||||
# Linux Kernel {#sec-kernel-config}
|
||||
|
||||
You can override the Linux kernel and associated packages using the
|
||||
option `boot.kernelPackages`. For instance, this selects the Linux 3.10
|
||||
kernel:
|
||||
|
||||
```nix
|
||||
boot.kernelPackages = pkgs.linuxPackages_3_10;
|
||||
```
|
||||
|
||||
Note that this not only replaces the kernel, but also packages that are
|
||||
specific to the kernel version, such as the NVIDIA video drivers. This
|
||||
ensures that driver packages are consistent with the kernel.
|
||||
|
||||
The default Linux kernel configuration should be fine for most users.
|
||||
You can see the configuration of your current kernel with the following
|
||||
command:
|
||||
|
||||
```ShellSession
|
||||
zcat /proc/config.gz
|
||||
```
|
||||
|
||||
If you want to change the kernel configuration, you can use the
|
||||
`packageOverrides` feature (see [](#sec-customising-packages)). For
|
||||
instance, to enable support for the kernel debugger KGDB:
|
||||
|
||||
```nix
|
||||
nixpkgs.config.packageOverrides = pkgs:
|
||||
{ linux_3_4 = pkgs.linux_3_4.override {
|
||||
extraConfig =
|
||||
''
|
||||
KGDB y
|
||||
'';
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
`extraConfig` takes a list of Linux kernel configuration options, one
|
||||
per line. The name of the option should not include the prefix
|
||||
`CONFIG_`. The option value is typically `y`, `n` or `m` (to build
|
||||
something as a kernel module).
|
||||
|
||||
Kernel modules for hardware devices are generally loaded automatically
|
||||
by `udev`. You can force a module to be loaded via
|
||||
[`boot.kernelModules`](options.html#opt-boot.kernelModules), e.g.
|
||||
|
||||
```nix
|
||||
boot.kernelModules = [ "fuse" "kvm-intel" "coretemp" ];
|
||||
```
|
||||
|
||||
If the module is required early during the boot (e.g. to mount the root
|
||||
file system), you can use [`boot.initrd.kernelModules`](options.html#opt-boot.initrd.kernelModules):
|
||||
|
||||
```nix
|
||||
boot.initrd.kernelModules = [ "cifs" ];
|
||||
```
|
||||
|
||||
This causes the specified modules and their dependencies to be added to
|
||||
the initial ramdisk.
|
||||
|
||||
Kernel runtime parameters can be set through
|
||||
[`boot.kernel.sysctl`](options.html#opt-boot.kernel.sysctl), e.g.
|
||||
|
||||
```nix
|
||||
boot.kernel.sysctl."net.ipv4.tcp_keepalive_time" = 120;
|
||||
```
|
||||
|
||||
sets the kernel's TCP keepalive time to 120 seconds. To see the
|
||||
available parameters, run `sysctl -a`.
|
||||
|
||||
## Customize your kernel {#sec-linux-config-customizing}
|
||||
|
||||
The first step before compiling the kernel is to generate an appropriate
|
||||
`.config` configuration. Either you pass your own config via the
|
||||
`configfile` setting of `linuxManualConfig`:
|
||||
|
||||
```nix
|
||||
custom-kernel = super.linuxManualConfig {
|
||||
inherit (super) stdenv hostPlatform;
|
||||
inherit (linux_4_9) src;
|
||||
version = "${linux_4_9.version}-custom";
|
||||
|
||||
configfile = /home/me/my_kernel_config;
|
||||
allowImportFromDerivation = true;
|
||||
};
|
||||
```
|
||||
|
||||
You can edit the config with this snippet (by default `make
|
||||
menuconfig` won\'t work out of the box on nixos):
|
||||
|
||||
```ShellSession
|
||||
nix-shell -E 'with import <nixpkgs> {}; kernelToOverride.overrideAttrs (o: {nativeBuildInputs=o.nativeBuildInputs ++ [ pkg-config ncurses ];})'
|
||||
```
|
||||
|
||||
or you can let nixpkgs generate the configuration. Nixpkgs generates it
|
||||
via answering the interactive kernel utility `make config`. The answers
|
||||
depend on parameters passed to
|
||||
`pkgs/os-specific/linux/kernel/generic.nix` (which you can influence by
|
||||
overriding `extraConfig, autoModules,
|
||||
modDirVersion, preferBuiltin, extraConfig`).
|
||||
|
||||
```nix
|
||||
mptcp93.override ({
|
||||
name="mptcp-local";
|
||||
|
||||
ignoreConfigErrors = true;
|
||||
autoModules = false;
|
||||
kernelPreferBuiltin = true;
|
||||
|
||||
enableParallelBuilding = true;
|
||||
|
||||
extraConfig = ''
|
||||
DEBUG_KERNEL y
|
||||
FRAME_POINTER y
|
||||
KGDB y
|
||||
KGDB_SERIAL_CONSOLE y
|
||||
DEBUG_INFO y
|
||||
'';
|
||||
});
|
||||
```
|
||||
|
||||
## Developing kernel modules {#sec-linux-config-developing-modules}
|
||||
|
||||
When developing kernel modules it\'s often convenient to run
|
||||
edit-compile-run loop as quickly as possible. See below snippet as an
|
||||
example of developing `mellanox` drivers.
|
||||
|
||||
```ShellSession
|
||||
$ nix-build '<nixpkgs>' -A linuxPackages.kernel.dev
|
||||
$ nix-shell '<nixpkgs>' -A linuxPackages.kernel
|
||||
$ unpackPhase
|
||||
$ cd linux-*
|
||||
$ make -C $dev/lib/modules/*/build M=$(pwd)/drivers/net/ethernet/mellanox modules
|
||||
# insmod ./drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko
|
||||
```
|
||||
@ -1,138 +0,0 @@
|
||||
<chapter xmlns="http://docbook.org/ns/docbook"
|
||||
xmlns:xlink="http://www.w3.org/1999/xlink"
|
||||
xmlns:xi="http://www.w3.org/2001/XInclude"
|
||||
version="5.0"
|
||||
xml:id="sec-kernel-config">
|
||||
<title>Linux Kernel</title>
|
||||
<para>
|
||||
You can override the Linux kernel and associated packages using the option
|
||||
<option>boot.kernelPackages</option>. For instance, this selects the Linux
|
||||
3.10 kernel:
|
||||
<programlisting>
|
||||
<xref linkend="opt-boot.kernelPackages"/> = pkgs.linuxPackages_3_10;
|
||||
</programlisting>
|
||||
Note that this not only replaces the kernel, but also packages that are
|
||||
specific to the kernel version, such as the NVIDIA video drivers. This
|
||||
ensures that driver packages are consistent with the kernel.
|
||||
</para>
|
||||
<para>
|
||||
The default Linux kernel configuration should be fine for most users. You can
|
||||
see the configuration of your current kernel with the following command:
|
||||
<programlisting>
|
||||
zcat /proc/config.gz
|
||||
</programlisting>
|
||||
If you want to change the kernel configuration, you can use the
|
||||
<option>packageOverrides</option> feature (see
|
||||
<xref
|
||||
linkend="sec-customising-packages" />). For instance, to enable support
|
||||
for the kernel debugger KGDB:
|
||||
<programlisting>
|
||||
nixpkgs.config.packageOverrides = pkgs:
|
||||
{ linux_3_4 = pkgs.linux_3_4.override {
|
||||
extraConfig =
|
||||
''
|
||||
KGDB y
|
||||
'';
|
||||
};
|
||||
};
|
||||
</programlisting>
|
||||
<varname>extraConfig</varname> takes a list of Linux kernel configuration
|
||||
options, one per line. The name of the option should not include the prefix
|
||||
<literal>CONFIG_</literal>. The option value is typically
|
||||
<literal>y</literal>, <literal>n</literal> or <literal>m</literal> (to build
|
||||
something as a kernel module).
|
||||
</para>
|
||||
<para>
|
||||
Kernel modules for hardware devices are generally loaded automatically by
|
||||
<command>udev</command>. You can force a module to be loaded via
|
||||
<xref linkend="opt-boot.kernelModules"/>, e.g.
|
||||
<programlisting>
|
||||
<xref linkend="opt-boot.kernelModules"/> = [ "fuse" "kvm-intel" "coretemp" ];
|
||||
</programlisting>
|
||||
If the module is required early during the boot (e.g. to mount the root file
|
||||
system), you can use <xref linkend="opt-boot.initrd.kernelModules"/>:
|
||||
<programlisting>
|
||||
<xref linkend="opt-boot.initrd.kernelModules"/> = [ "cifs" ];
|
||||
</programlisting>
|
||||
This causes the specified modules and their dependencies to be added to the
|
||||
initial ramdisk.
|
||||
</para>
|
||||
<para>
|
||||
Kernel runtime parameters can be set through
|
||||
<xref linkend="opt-boot.kernel.sysctl"/>, e.g.
|
||||
<programlisting>
|
||||
<xref linkend="opt-boot.kernel.sysctl"/>."net.ipv4.tcp_keepalive_time" = 120;
|
||||
</programlisting>
|
||||
sets the kernel’s TCP keepalive time to 120 seconds. To see the available
|
||||
parameters, run <command>sysctl -a</command>.
|
||||
</para>
|
||||
<section xml:id="sec-linux-config-customizing">
|
||||
<title>Customize your kernel</title>
|
||||
|
||||
<para>
|
||||
The first step before compiling the kernel is to generate an appropriate
|
||||
<literal>.config</literal> configuration. Either you pass your own config
|
||||
via the <literal>configfile</literal> setting of
|
||||
<literal>linuxManualConfig</literal>:
|
||||
<screen><![CDATA[
|
||||
custom-kernel = super.linuxManualConfig {
|
||||
inherit (super) stdenv hostPlatform;
|
||||
inherit (linux_4_9) src;
|
||||
version = "${linux_4_9.version}-custom";
|
||||
|
||||
configfile = /home/me/my_kernel_config;
|
||||
allowImportFromDerivation = true;
|
||||
};
|
||||
]]></screen>
|
||||
You can edit the config with this snippet (by default <command>make
|
||||
menuconfig</command> won't work out of the box on nixos):
|
||||
<screen><![CDATA[
|
||||
nix-shell -E 'with import <nixpkgs> {}; kernelToOverride.overrideAttrs (o: {nativeBuildInputs=o.nativeBuildInputs ++ [ pkg-config ncurses ];})'
|
||||
]]></screen>
|
||||
or you can let nixpkgs generate the configuration. Nixpkgs generates it via
|
||||
answering the interactive kernel utility <command>make config</command>. The
|
||||
answers depend on parameters passed to
|
||||
<filename>pkgs/os-specific/linux/kernel/generic.nix</filename> (which you
|
||||
can influence by overriding <literal>extraConfig, autoModules,
|
||||
modDirVersion, preferBuiltin, extraConfig</literal>).
|
||||
<screen><![CDATA[
|
||||
|
||||
mptcp93.override ({
|
||||
name="mptcp-local";
|
||||
|
||||
ignoreConfigErrors = true;
|
||||
autoModules = false;
|
||||
kernelPreferBuiltin = true;
|
||||
|
||||
enableParallelBuilding = true;
|
||||
|
||||
extraConfig = ''
|
||||
DEBUG_KERNEL y
|
||||
FRAME_POINTER y
|
||||
KGDB y
|
||||
KGDB_SERIAL_CONSOLE y
|
||||
DEBUG_INFO y
|
||||
'';
|
||||
});
|
||||
]]></screen>
|
||||
</para>
|
||||
</section>
|
||||
<section xml:id="sec-linux-config-developing-modules">
|
||||
<title>Developing kernel modules</title>
|
||||
|
||||
<para>
|
||||
When developing kernel modules it's often convenient to run edit-compile-run
|
||||
loop as quickly as possible. See below snippet as an example of developing
|
||||
<literal>mellanox</literal> drivers.
|
||||
</para>
|
||||
|
||||
<screen>
|
||||
<prompt>$ </prompt>nix-build '<nixpkgs>' -A linuxPackages.kernel.dev
|
||||
<prompt>$ </prompt>nix-shell '<nixpkgs>' -A linuxPackages.kernel
|
||||
<prompt>$ </prompt>unpackPhase
|
||||
<prompt>$ </prompt>cd linux-*
|
||||
<prompt>$ </prompt>make -C $dev/lib/modules/*/build M=$(pwd)/drivers/net/ethernet/mellanox modules
|
||||
<prompt># </prompt>insmod ./drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko
|
||||
</screen>
|
||||
</section>
|
||||
</chapter>
|
||||
153
nixos/doc/manual/from_md/configuration/linux-kernel.chapter.xml
Normal file
153
nixos/doc/manual/from_md/configuration/linux-kernel.chapter.xml
Normal file
@ -0,0 +1,153 @@
|
||||
<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-kernel-config">
|
||||
<title>Linux Kernel</title>
|
||||
<para>
|
||||
You can override the Linux kernel and associated packages using the
|
||||
option <literal>boot.kernelPackages</literal>. For instance, this
|
||||
selects the Linux 3.10 kernel:
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
boot.kernelPackages = pkgs.linuxPackages_3_10;
|
||||
</programlisting>
|
||||
<para>
|
||||
Note that this not only replaces the kernel, but also packages that
|
||||
are specific to the kernel version, such as the NVIDIA video
|
||||
drivers. This ensures that driver packages are consistent with the
|
||||
kernel.
|
||||
</para>
|
||||
<para>
|
||||
The default Linux kernel configuration should be fine for most
|
||||
users. You can see the configuration of your current kernel with the
|
||||
following command:
|
||||
</para>
|
||||
<programlisting>
|
||||
zcat /proc/config.gz
|
||||
</programlisting>
|
||||
<para>
|
||||
If you want to change the kernel configuration, you can use the
|
||||
<literal>packageOverrides</literal> feature (see
|
||||
<xref linkend="sec-customising-packages" />). For instance, to
|
||||
enable support for the kernel debugger KGDB:
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
nixpkgs.config.packageOverrides = pkgs:
|
||||
{ linux_3_4 = pkgs.linux_3_4.override {
|
||||
extraConfig =
|
||||
''
|
||||
KGDB y
|
||||
'';
|
||||
};
|
||||
};
|
||||
</programlisting>
|
||||
<para>
|
||||
<literal>extraConfig</literal> takes a list of Linux kernel
|
||||
configuration options, one per line. The name of the option should
|
||||
not include the prefix <literal>CONFIG_</literal>. The option value
|
||||
is typically <literal>y</literal>, <literal>n</literal> or
|
||||
<literal>m</literal> (to build something as a kernel module).
|
||||
</para>
|
||||
<para>
|
||||
Kernel modules for hardware devices are generally loaded
|
||||
automatically by <literal>udev</literal>. You can force a module to
|
||||
be loaded via
|
||||
<link xlink:href="options.html#opt-boot.kernelModules"><literal>boot.kernelModules</literal></link>,
|
||||
e.g.
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
boot.kernelModules = [ "fuse" "kvm-intel" "coretemp" ];
|
||||
</programlisting>
|
||||
<para>
|
||||
If the module is required early during the boot (e.g. to mount the
|
||||
root file system), you can use
|
||||
<link xlink:href="options.html#opt-boot.initrd.kernelModules"><literal>boot.initrd.kernelModules</literal></link>:
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
boot.initrd.kernelModules = [ "cifs" ];
|
||||
</programlisting>
|
||||
<para>
|
||||
This causes the specified modules and their dependencies to be added
|
||||
to the initial ramdisk.
|
||||
</para>
|
||||
<para>
|
||||
Kernel runtime parameters can be set through
|
||||
<link xlink:href="options.html#opt-boot.kernel.sysctl"><literal>boot.kernel.sysctl</literal></link>,
|
||||
e.g.
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
boot.kernel.sysctl."net.ipv4.tcp_keepalive_time" = 120;
|
||||
</programlisting>
|
||||
<para>
|
||||
sets the kernel’s TCP keepalive time to 120 seconds. To see the
|
||||
available parameters, run <literal>sysctl -a</literal>.
|
||||
</para>
|
||||
<section xml:id="sec-linux-config-customizing">
|
||||
<title>Customize your kernel</title>
|
||||
<para>
|
||||
The first step before compiling the kernel is to generate an
|
||||
appropriate <literal>.config</literal> configuration. Either you
|
||||
pass your own config via the <literal>configfile</literal> setting
|
||||
of <literal>linuxManualConfig</literal>:
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
custom-kernel = super.linuxManualConfig {
|
||||
inherit (super) stdenv hostPlatform;
|
||||
inherit (linux_4_9) src;
|
||||
version = "${linux_4_9.version}-custom";
|
||||
|
||||
configfile = /home/me/my_kernel_config;
|
||||
allowImportFromDerivation = true;
|
||||
};
|
||||
</programlisting>
|
||||
<para>
|
||||
You can edit the config with this snippet (by default
|
||||
<literal>make menuconfig</literal> won't work out of the box on
|
||||
nixos):
|
||||
</para>
|
||||
<programlisting>
|
||||
nix-shell -E 'with import <nixpkgs> {}; kernelToOverride.overrideAttrs (o: {nativeBuildInputs=o.nativeBuildInputs ++ [ pkg-config ncurses ];})'
|
||||
</programlisting>
|
||||
<para>
|
||||
or you can let nixpkgs generate the configuration. Nixpkgs
|
||||
generates it via answering the interactive kernel utility
|
||||
<literal>make config</literal>. The answers depend on parameters
|
||||
passed to
|
||||
<literal>pkgs/os-specific/linux/kernel/generic.nix</literal>
|
||||
(which you can influence by overriding
|
||||
<literal>extraConfig, autoModules, modDirVersion, preferBuiltin, extraConfig</literal>).
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
mptcp93.override ({
|
||||
name="mptcp-local";
|
||||
|
||||
ignoreConfigErrors = true;
|
||||
autoModules = false;
|
||||
kernelPreferBuiltin = true;
|
||||
|
||||
enableParallelBuilding = true;
|
||||
|
||||
extraConfig = ''
|
||||
DEBUG_KERNEL y
|
||||
FRAME_POINTER y
|
||||
KGDB y
|
||||
KGDB_SERIAL_CONSOLE y
|
||||
DEBUG_INFO y
|
||||
'';
|
||||
});
|
||||
</programlisting>
|
||||
</section>
|
||||
<section xml:id="sec-linux-config-developing-modules">
|
||||
<title>Developing kernel modules</title>
|
||||
<para>
|
||||
When developing kernel modules it's often convenient to run
|
||||
edit-compile-run loop as quickly as possible. See below snippet as
|
||||
an example of developing <literal>mellanox</literal> drivers.
|
||||
</para>
|
||||
<programlisting>
|
||||
$ nix-build '<nixpkgs>' -A linuxPackages.kernel.dev
|
||||
$ nix-shell '<nixpkgs>' -A linuxPackages.kernel
|
||||
$ unpackPhase
|
||||
$ cd linux-*
|
||||
$ make -C $dev/lib/modules/*/build M=$(pwd)/drivers/net/ethernet/mellanox modules
|
||||
# insmod ./drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko
|
||||
</programlisting>
|
||||
</section>
|
||||
</chapter>
|
||||
Loading…
Reference in New Issue
Block a user