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This article mainly analyzes the relevant knowledge points of how to analyze the function and function of the Linux system kernel, the content is detailed and easy to understand, the operation details are reasonable, and has a certain reference value. If you are interested, you might as well follow the editor and learn more about "how to analyze the function and function of the Linux kernel".

Introduction to Linux kernel: Linux kernel [kernel] is the lowest level of the entire operating system, which is responsible for driving the entire hardware and providing core functions needed by various systems, including firewall mechanism, whether to support file systems such as LVM or Quota, and so on. If the kernel does not know the latest hardware, then the hardware cannot be driven and you cannot use the hardware.

What the computer really works is hardware, such as CPU for numerical calculation, hard disk for data storage, display adapter for graphic display, sound chip for music sound, network card for connecting Internet, and so on. The kernel controls how these chips work.

Linux kernel work content 1, process management

The kernel is responsible for creating and destroying processes and dealing with their connections to the outside world (inputs and outputs). Different inter-process communication (through signals, pipes, or inter-process communication primitives) is basic to the function of the whole system and is also handled by the kernel. In addition, the scheduler, which controls how processes share CPU, is part of process management. More generally, kernel process management activities implement the abstraction of multiple processes on a single or several CPU.

2. Memory management

Computer memory is the main resource, and the strategy used to deal with it is crucial to system performance. The kernel creates a virtual address space for each of all processes on limited available resources. Different parts of the kernel interact with the memory management subsystem through a set of function calls, from simple malloc/free pairs to more and more complex functions.

3. File system Unix is largely based on the concept of file system; almost anything in Unix can be regarded as a file. The kernel builds a structured file system on unstructured hardware. as a result, file abstraction is widely used in the whole system. In addition, Linux supports multiple file system types, that is, different data organizations on physical media. For example, disks can be formatted into a standard Linux ext3 file system, a commonly used FAT file system, or several other file systems.

4. Equipment control

Almost every system operation is eventually mapped to a physical device. With the exception of processors, memory, and very few other entities, any device control operation in all is performed by code specific to the device to be addressed. These codes are called device drivers. The kernel must embed drivers for every peripheral that appears in the system, from hard disk drives to keyboard and tape drives. This aspect of kernel functionality is of primary interest to us in this book.

5. Network

The network must be managed by the operating system because most network operations are not specific to a process: messages entering the system are asynchronous events. Messages must be collected, identified, and distributed before a process can take over. The system is responsible for delivering data messages between the program and the network interface, and it must control the execution of the program according to the network activities of the program. In addition, all routing and address resolution problems are implemented in the kernel.

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

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