Loadable kernel modules are a convenient way to modify the running kernel without rebuilding the kernel from scratch. You can also free up memory resources by unloading any unnecessary kernel module.
A kernel module can be loaded or unloaded on the fly by modprobe command. When loading a kernel module with modprobe, the command will also load any prerequisite module(s) automatically. Likewise, modprobe removes a kernel module along with any dependent module(s) that are no longer used.
Any kernel modules that are manually loaded by modprobe will not remain in the kernel after rebooting. If you would like to load a specific kernel module automatically upon reboot, you can follow this instruction. In this example, "loop" is the name of the kernel module that I would like to load permanently.
On Debian/Ubuntu systems:
$ sudo chmod +x /etc/rc.modules
Now the module "loop" will be loaded persistently across reboots.
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