Article directory
1. Process scheduling
Process scheduling:
Process is the basic unit of resource allocation in the system;
When each process is running, it feels that it occupies all the hardware resources,
In fact, a process will not monopolize a resource for a long time,
The operating system uses the process scheduler to make multiple processes execute concurrently;
The Linux kernel does not strictly distinguish between processes and threads;
Process management: including process creation, destruction, thread group management, kernel thread management, queue waiting;
Process scheduling is located in the kernel ;
2. Memory management
Memory management involves physical memory management and virtual memory management , and is the most complex module in the Linux kernel;
Virtual memory management includes: reverse mapping, KSM, MMAP mapping, page fault interrupt, shared memory, process virtual address space management, page recycling;
Physical memory management includes: page allocator, etc.;
Memory management is located in the kernel ;
3. Interrupt management
Interrupt management includes: processor exception handling, interrupt handling;
Exception refers to the detection of abnormal conditions when the processor executes, the processor needs to stop the currently executing stack and handle the exception;
Interrupt management is located in the kernel ;
4. Equipment management
The Linux kernel supports the most peripheral types,
- device tree
- PCI bus device
- Device model Kobject
- ACPI
- network device driver
- block device driver
- character device driver
Device management is located in the kernel ;
5. File system
File system application scenarios:
- F2FS
- EXT 2/3/4
- XFS
In order to support various file systems, the Linux kernel abstracts a virtual file system VFS , which is a software layer of the file system, so that the Linux kernel can easily integrate various file systems;
The file system is located in the kernel ;
