Linux from the Linux kernel point of view Linux upper application

System calls

is a soft interrupt, API function, let the upper application fall into the kernel

Process Management

Process scheduling, scheduling algorithm, process three-state

Process is the minimum unit fork for CPU scheduling resources

VFS Virtual File Management

Under Linux, all the devices are files

Driver Bus Model 2.4 2.6 (TRUE) Support PnP

Ext3 ext2 vfat File Management system

----> Driver Development under the driver bus model

Memory management

Process logical address translated to physical address

1. Paragraph-type management

Logical address translated to linear address

2. Page-style management

Linear address translated to physical address

The Linux kernel creates a separate process space for our applications

The kernel abstracts the process, abstracts out a lot of resource scheduling, which can efficiently utilize system resources.

-----> Multi-Channel program processing

Network protocol Stack Management

Why put the TCPIP protocol stack into the Linux kernel?

If you need a large number of read-write network cards, the operation of hardware resources need to fall into the kernel, the overall system performance is reduced.

　

-----> Build a knowledge system

ARC System Management

Linux kernel not only supports x86 platform, ARM MIPS PowerPC Motorola Hardware CPU

　　

Linux from the Linux kernel point of view Linux upper application