Tag：kernel
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Time：2021-1-4
Starting from understanding the operating system Before the official start of Linux, simply spend a little space on the content related to the operating system. 1.1. Introduction of operating system What is an operating system Operating system (OS) is the program to manage computer hardware and software resources, is the cornerstone of the computer. Operating […]
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Time：2021-1-3
Starting from understanding the operating system Before the official start of Linux, simply spend a little space on the content related to the operating system. 1.1. Introduction of operating system What is an operating system Operating system (OS) is the program to manage computer hardware and software resources, is the cornerstone of the computer. Operating […]
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Time：2020-12-30
Source: http://blog.seclibs.com/nginx… The program architecture of nginx is as follows Later, we will comb the architecture of nginx according to the content shown in this figure. The content involved in this paper is mainly for Linux system. The top master process is directly controlled by the administrator, and only the master receives the administrator’s signal. […]
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Time：2020-12-28
Android source code download and compilation – 2020 use https://mirrors.tuna.tsinghua.edu.cn/help/AOSP Download the Android source code Repo 1 Download repo from Tsinghua mirror curl https://mirrors.tuna.tsinghua.edu.cn/git/git-repo -o repo chmod +x repo Set update source: export REPO_URL=’https://mirrors.tuna.tsinghua.edu.cn/git/git-repo/’ 2. Download Android Because the Android source code is bigger and bigger, the probability of repo sync failure is higher and […]
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Time：2020-12-20
@ catalog Analysis of bootloader startup process Bootloader phase 1 features Hardware device initialization Preparing RAM space for loading bootloader’s second phase code (initializing memory space) Copy the second stage code of bootloader into SDRAM space (relocation) Set up the stack Jump to the C entry point of the second stage code Functions of bootloader […]
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Time：2020-12-11
This paper describes the following: Hierarchical view of file system How is the data organized on the hard disk? When reading and writing a file, how to address the disk sector from the beginning of the file? Complete process in read and write kernel Directio does not go through pagecache, and the user mode data […]
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Time：2020-12-10
User space and kernel space Traditional IO stream Zero copy The main task of zero copy is to prevent the CPU from copying data from block storage to other block storage. The main task is to use various copying technologies to avoid making CPU do a large amount of data copying task, reduce unnecessary copying, […]
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Time：2020-12-8
This document introduces the method of forbidding and opening Ping in rhel7 1、 Kernel parameter setting 1. Allow Ping settings temporary echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all permanent echo net.ipv4.icmp_echo_ignore_all=0 >> /etc/sysctl.confSysctl – P ා execute thiscommandMake the changed / etc/ sysctl.conf Configuration file takes effect Note: if / etc/ sysctl.conf It already exists in the configuration file […]
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Time：2020-12-8
In the network, many servers use Linux system. In order to further improve the performance of the server, it may be necessary to recompile the Linux kernel according to the specific hardware and requirements. To compile the Linux kernel, we need to follow the prescribed steps, and several important files are involved in the process […]
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Time：2020-12-7
Introduction to Linux kernelNow let’s take a look at the architecture of GNU / Linux operating system from a higher perspective. You can think of an operating system at two levels, as shown in the figure below At the top is the user (or application) space. This is where the user application is executed. Under […]
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Time：2020-11-29
Copy on write (cow) is an important mechanism of Linux kernel. We all know that when the parent process forks a child process, the child process and the parent process will share all private writable pages in a read-only manner. When one party is about to write, the cow page missing exception will occur. So […]
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Time：2020-11-29
Words are like meeting. Some time ago, Node.js The official release of node 8.9.3 lts version, and the home page of the official website indicates that the new version has important security updates, “important security releases, please update now!”, and then I immediately started to upgrade the node version of each module of the company’s […]
