lsmod command is used to display the status of modules in the Linux kernel. It results in a list of loaded modules. lsmod is a trivial program which nicely formats the contents of the /proc/modules , showing what kernel modules are currently loaded.
What is use of lsmod in Linux?
lsmod is a command on Linux systems. It shows which loadable kernel modules are currently loaded. “Module” denotes the name of the module. “Size” denotes the size of the module (not memory used) in Bytes.
What is a module in Linux?
Linux modules are lumps of code that can be dynamically linked into the kernel at any point after the system has booted. They can be unlinked from the kernel and removed when they are no longer needed. Mostly Linux kernel modules are device drivers, pseudo-device drivers such as network drivers, or file-systems.
How use rmmod Linux?
rmmod command in Linux system is used to remove a module from the kernel. Most of the users still use modprobe with the -r option instead of using rmmod.
What modprobe does in Linux?
modprobe is a Linux program originally written by Rusty Russell and used to add a loadable kernel module to the Linux kernel or to remove a loadable kernel module from the kernel. It is commonly used indirectly: udev relies upon modprobe to load drivers for automatically detected hardware.
Can kernel modules be loaded after boot?
As shown in Listing information about a kernel module with lsmod, many kernel modules are loaded automatically at boot time. You can specify additional modules to be loaded by the systemd-modules-load.
How do I list all modules in Linux?
To list all currently loaded modules in Linux, we can use the lsmod (list modules) command which reads the contents of /proc/modules like this.
Why do we need kernel module?
So, you want to write a kernel module. … They extend the functionality of the kernel without the need to reboot the system. For example, one type of module is the device driver, which allows the kernel to access hardware connected to the system.
How does module load work?
Its packages work by modifying environment variables such as PATH and LD_LIBRARY_PATH which are made to point to pre-compiled versions of the software you want to use, which are then made available to all nodes through some mount such as NFS.
What is module load Linux?
module load [modulefile] Loads module or specifies which dependencies have not been loaded. module unload [modulefile] Unloads specified module from environment.
What do insmod and rmmod do?
insmod — Insert a module into the Linux kernel. lsmod — Show the status of Linux kernel modules. modinfo — Show information about a Linux kernel module. modprobe — Add and remove modules from the Linux kernel.
What happens when insmod is called?
When we do insmod on a module, it performs a series of steps: It calls init_module() to intimate the kernel that a module is attempted to be loaded and transfers the control to the kernel. In kernel, sys_init_module() is run.
What is rmmod Ubuntu?
rmmod is a trivial program to remove a module (when module unloading support is provided) from the kernel. Most users will want to use modprobe(8) with the -r option instead.
What does the modprobe command do?
Use the modprobe command to add or remove modules on Linux. The command works intelligently and adds any dependent modules automatically. The kernel uses modprobe to request modules. The modprobe command searches through the standard installed module directories to find the necessary drivers.
What does SND Aloop do?
snd-aloop is the kernel module for setting up virtual audio loopback devices. Now in this, whatever audio is played back into hw:2,0,s could be captured from hw:2,1,s and viceversa, s ranging from 0 to 7.
What is the difference between insmod and modprobe?
modprobe is the intelligent version of insmod . insmod simply adds a module where modprobe looks for any dependency (if that particular module is dependent on any other module) and loads them.