system idle process

What is a daemon process? The daemon (Daemon process), which is usually called the Daemon process (daemon), is the background service process in Linux. It is a long-lived process, usually independent of the control terminal and periodically performs some sort of task or wait

actionsResponse time is faster and average latency is lower than 50~150msTypical interactive programs: shell, text editing programs, graphics applications, etc.The scheduling algorithm related code in the kernel uses a policy pattern similar to Ood.2, the timing of process scheduling Interrupt processing (including clock interrupts, I/O interrupts, system calls, and exceptions), call schedule () d

The transition of the experiment eight process and the general execution process of the system20135114 Wang Zhaoxian Original works reprint please indicate the source "Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000First, process switching key code SWITCH_TO analysis 1.1 process sche

respective memory is split and controlled by the operating system, which is much more efficient than one program exclusive memory and one queue into memory.Other resources for space reuse also have disks, and in many systems, one disk saves files for many users at the same time. Allocating disk space and documenting who is using which disk block is a typical task for operating system resource management.Th

parallel execution on multiple processors. When a process is not introduced, only two programs that belong to one application can be executed sequentially. By introducing a process to create a process for multiple programs in memory, they can execute concurrently, greatly improving system resource utilization and

signals, such as keystrokes. The user, kernel and process can generate send signal: (1) The user presses the interrupt combination key "Ctrl" + "C", the terminal driver receives the input character, and calls the signal system, the signaling system sends the SIGINT signal to the Shell,shell to send it to the process,

scheduling timing of processes and switching of processesThe principle of operating system describes a large number of process scheduling algorithms, these algorithms from the perspective of implementation is only to choose a new process from the run queue, the process of selecting the use of different strategies.It is

Week 8 process switching and general execution of the system "20135239 original please specify the source" Linux kernel Analysis "MOOC course http://mooc.study.163.com/course/USTC-1000029000" one, Timing analysis of process scheduling and process scheduling The principle of operating

First, process switching key code SWITCH_TO Analysis 1. Progress of process and timing analysis of process scheduling Interrupt processing (including clock interrupts, I/O interrupts, system calls, and exceptions), call schedule () directly, or call schedule () based on the need_resched tag when returning to t