What is the Linux Kernel? - Ubbergo

What is the Linux Kernel? The Kernel’s role in the operating system.

The Linux Kernel is the core element of a Linux operating system (OS) and works as the interface between the computer’s hardware and its processes. 

The kernel, like a seed within a hard shell, controls all of the key operations of the hardware, whether it’s a phone, laptop, server, or any other kind of computer.

In this article, you will find the main elements of what is the Linux Kernel and the best resources for Linux Kernel certification.

Kernel objectives

  • To connect the user’s application to the hardware.
  • To determine the current condition of any new processes that are being received.
  • To manage disc space.
  • Control the way memory is used.
  • Keeping a close eye on tasks.

The function of Kernel

This is what a kernel does:

  • Tracking the amount of memory is being utilized to store something, and where it is being stored.
  • Decide which processes are allowed to utilize the central processing unit (CPU) at any given time, as well as for how long.
  • Act as a bridge between the operating system and the hardware.
  • Security and calls to system functions: Answer the processes’ service requests

What is the Linux Kernel space?

Kernel space (or “kernel space”) is a virtual environment where the kernel allocates memory and maintains track of where all of the data is stored. User space refers to what the user sees, such as web browsers and data. System calls are used by these apps to communicate with the kernel (SCI).

Think about it this way: The kernel is a well-organized personal assistant of a high-ranking official (the hardware). There are several responsibilities for the assistant, including relaying messages and requests to and from the executive, storing information, and determining who has entry to the executive and for how long.

The Linux Kernel primary subsystems

  • The Scheduler for Processes
  • The Memory Management Unit (MMU)
  • The Virtual File System (VFS)
  • The Networking Unit
  • Inter-Process Communication Unit
  • It’s the Linux Kernel.

To keep things simple, we’ll simply be discussing the Linux Kernel’s first three most significant subsystems here. Each of the first three subsystems is explained below:

  • It’s the job of the Process Scheduler, a kernel component, to distribute CPU time between all processes that are active at once.
  • As a kernel sub-unit, the Memory Management Unit ensures that all processes on a computer have equal access to memory. The MMU is more than just a virtual address space for each of the processes; it provides a lot more.
  • Data may be accessed across various filesystems and physical storage systems using the same interface provided by the Virtual File System (VFS).

Operating System vs Kernel

The operating system is system software that acts as the interface between the user and the computer. When a computer starts up, the first software that loads is the operating system.

A kernel is the main component of an operating system that translates user instructions into machine code.

The Kernel’s role in the operating system

The kernel is the operating system’s most important component since it controls the computer’s and hardware’s functions. It is primarily responsible for the management of CPU and memory resources. It’s an essential part of any operating system, no matter what kind it is. Data processing at the hardware level is handled by the kernel via inter-process connections and system calls.

Three layers of a Linux computer may be thought of as a kernel:

  • Storage, networking, and graphics are all examples of I/O devices included in a computer system’s hardware, which includes RAM and the processor or central processing unit (CPU). Computations are performed by the CPU, which also reads and writes to the memory.
  • The Linux kernel is the operating system’s foundation. Right in the midst of everything! It’s software that directs the CPU on what to do that’s stored in the memory of the computer.
  • The running applications that the kernel controls are known as user processes. User space is made up of all of the user’s interactions with the system. A user process is also referred to as a “process” by certain people. These processes and servers may also interact with each other using the kernel’s functions.

CPUs execute code in one of two modes: either kernel function or user function. Users can only access the CPU and memory in user mode; kernel code has full access to all hardware resources. Memory has a similar split into kernel space and user space. In order to do complex tasks such as constructing containers, virtual machines, and separating privileges, these two simple things are necessary.

This also implies that if a process is interrupted in user function, the impact is minimized and the kernel can recover. An error in the kernel process may bring down the whole system because of its accessibility to memory and the CPU. A user process crash is typically not a big issue because of the controls in place and the need for authorization to cross borders.

As soon as an operating system starts, the kernel is the first thing to be put into memory. It’s in charge of a slew of things, including disc management, process management, and memory management, among others.

It determines which processes should be allotted to the CPU and which processes should be retained in the main memory. It primarily serves as a conduit between software and hardware. One of the most important functions of the kernel is to control the flow of data between user-level software and the computer’s hardware, including the CPU and disc memory.

The best Linux Kernel certifications

A Beginner’s Guide to Linux Kernel Development (LFD103) FREE

Skills Covered: Linux Kernel Development Process, Patches, Linux Kernel Community, Configuring Development System, …
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Free!

Linux Kernel Internals and Development (LFD420) Top Value

Skills Covered: Working in OSS Projects, Kernel Architecture, Kernel Programming, Kernel Initialization, Kernel …
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$3,250.00

Linux Kernel Debugger and Security Certification (LFD440) Top Value

Concepts Covered:  Working in OSS Projects, Kernel Features, Monitoring, Debugging, The proc Filesystem, Kernel Core …
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$3,250.00

Why choose The Linux Foundation?

The Linux Foundation offers Linux online training courses and certificates all around the world.

The following are just a few main reasons why to choose them among other Linux Training providers:

  • It’s hard to find a better resource than the Linux Foundation for learning about Linux and other open source software.
  • Open technology ecosystems are built by the Linux Foundation, a non-profit organization that brings together the best engineers and corporations around the globe.
  • In order to provide the most current information, the Linux Foundation constantly updates its training programs. As the only Linux Foundation Training provider, we stand out from the crowd with our courses since they can be utilized with any version of Linux (including RedHat, Ubuntu, and SUSE).
  • With no revenue from software sales or support services, Linux training resources are free of additional fees. There is just one goal: to help students learn about the subject matter.
  • A large Linux Foundation community can answer students’ questions concerning them. You’re receiving instruction from experts in their fields!
  • A certification from the Linux Foundation demonstrates your expertise and demonstrates to your company and colleagues that you are competent in the Linux system.

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