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Move modprobe into getting started, re-add myinsmod.out, deambiguate kmod modprobe header

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Ciro Santilli
2018-03-18 15:27:55 +00:00
parent 36940cb322
commit f5e04f6b33
1 changed files with 63 additions and 50 deletions
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113
README.adoc
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@@ -318,6 +318,65 @@ This line is also saved to a file for convenience:
cat ./run.log
....
=== modprobe
If you are feeling fancy, you can also insert modules with:
....
modprobe dep2
lsmod
# dep and dep2
....
This method also deals with module dependencies, which we almost don't use to make examples simpler:
* https://askubuntu.com/questions/20070/whats-the-difference-between-insmod-and-modprobe
* https://stackoverflow.com/questions/22891705/whats-the-difference-between-insmod-and-modprobe
Removal also removes required modules that have zero usage count:
....
modprobe -r dep2
lsmod
# Nothing.
....
but it can't know if you actually insmodded them separately or not:
....
modprobe dep
modprobe dep2
modprobe -r dep2
# Nothing.
....
so it is a bit risky.
`modprobe` searches for modules under:
....
ls /lib/modules/*/extra/
....
Kernel modules built from the Linux mainline tree with `CONFIG_SOME_MOD=m`, are automatically available with `modprobe`, e.g.:
....
modprobe dummy-irq
....
=== myinsmod
https://stackoverflow.com/questions/5947286/how-to-load-linux-kernel-modules-from-c-code
If you are feeling raw, you can insert and remove modules with our own minimal module inserter and remover!
....
/myinsmod.out /hello.ko
/myrmmod.out hello
....
which teaches you how it is done from C code.
[[gdb]]
== GDB step debugging
@@ -1025,52 +1084,6 @@ To restore it, run:
./build -- initscripts-reconfigure
....
== modprobe
If you are feeling fancy, you can also insert modules with:
....
modprobe dep2
lsmod
# dep and dep2
....
This method also deals with module dependencies, which we almost don't use to make examples simpler:
* https://askubuntu.com/questions/20070/whats-the-difference-between-insmod-and-modprobe
* https://stackoverflow.com/questions/22891705/whats-the-difference-between-insmod-and-modprobe
Removal also removes required modules that have zero usage count:
....
modprobe -r dep2
lsmod
# Nothing.
....
but it can't know if you actually insmodded them separately or not:
....
modprobe dep
modprobe dep2
modprobe -r dep2
# Nothing.
....
so it is a bit risky.
`modprobe` searches for modules under:
....
ls /lib/modules/*/extra/
....
Kernel modules built from the Linux mainline tree with `CONFIG_SOME_MOD=m`, are automatically available with `modprobe`, e.g.:
....
modprobe dummy-irq
....
== KVM
You can make QEMU or gem5 <<gem5-vs-qemu-performance,run faster>> by passing enabling KVM with:
@@ -3026,6 +3039,8 @@ Google M-lab speed test: 36.4Mbps
=== kmod
https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git
Multi-call executable that implements: `lsmod`, `insmod`, `rmmod`, and other tools on desktop distros such as Ubuntu 16.04, where e.g.:
....
@@ -3056,15 +3071,13 @@ Buildroot also has a kmod package, but we are not using it since BusyBox' versio
This page will only describe features that differ from kmod to the BusyBox implementation.
Source code: https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git
==== module-init-tools
Name of a predecessor set of tools.
==== modprobe
==== kmod modprobe
Load module under different name to avoid conflicts:
kmod's `modprobe` can also load modules under different names to avoid conflicts, e.g.:
....
sudo modprobe vmhgfs -o vm_hgfs