xnu kernel

Linux Kernel development-process scheduling and Linux kernel Process Scheduling This section briefly introduces the knowledge about process scheduling in kernel development. What is process scheduling? Process Scheduling is to select the most appropriate process execution process from a ready process. Process Scheduling Policy Real-time Class Scheduling Polic

Linux Kernel compilation practice-Linux configuration and kernel compilation utility-general Linux technology-linux programming and kernel information. For details, see the following. Many tools are used to configure and compile the kernel. Here, we will only introduce several key tools. For more information, see the r

Core (Kernel):/boot/vmlinuz-version version with release package, local versionKernel module (Kernel object):/lib/modules/version/Kernel design:Single CoreModular design-small core, function moduleMicro-coreLoading module:InsmodModprobeKernel Download: www.kernel.org2 (Master). 6 (Times). 17 (fixed)-->2.6.17.1 fix bug2.6.18.RC1 (alternate) new featuresUser space

First, the experimental environmentVirtual machines: VMware Workstation 12.0;Operating system: ubuntu16.04 (32-bit);Current kernel version: 4.4.0-21-genericSecond, the Knowledge reserveNow, let's take a look at what a kernel module is:A module is a standalone program that can be compiled separately, but not run independently. It is linked to the kernel at run tim

Inotify-File System notification mechanism in the kernel, inotify-Kernel Reprinted: http://www.ibm.com/developerworks/cn/linux/l-inotifynew/index.htmlI. Introduction As we all know, Linux desktop systems are much less satisfactory than MAC or Windows. To improve this situation, the open-source community proposes that the kernel should provide some mechanisms for

Single-core and micro-kernel-general Linux technology-Linux programming and kernel information. The following is a detailed description. Single Kernel: the kernel is implemented as a large process and runs in a separate address space at the same time. All kernel services run

Source: http://www.top-e.org/jiaoshi/html? 196. html "It's really cool to tell me that the real entry address of the C program compiled using the glibc library in Linux is _ start (). Isn't that enough ?" The rotten eggs flat. Well, I just want to use a special way to describe the problem. I pay more attention to the ways of thinking embodied in the process of exploration and the fun of it. Return to our topic. Why is the Linux Kernel not executed fr

1. Review the kernel commands that need to be updated:Apt-cache Search LinuxThe command will show all the kernels that can be obtained2. Install the kernel, assuming you want to install a kernel of 2.6.39-0, use the following commandsudo apt-get install linux-headers-2.6.39-0-generic linux-image-2.6.39-0-genericAfter installation, reboot can, after reboot, both s

1.SoC Linux Bottom drive composition and status To allow Linux to run on a brand new arm SOC, there are a number of underlying support, such as timer beats, interrupt controllers, SMP booting, CPU HotPlug, and the underlying GPIO, clock, Pinctrl, and DMA hardware packages. Timer beats, interrupt controllers, SMP boot, and CPU hotplug are relatively not as cluttered as the early Gpio, clock, Pinctrl, and DMA implementations, and basically have a fixed routine. Timer beats for Linux based on time

(This chapter is based on: linux-4.4.0-37) There are many ways to communicate between the kernel and user space, NetLink is one of them, and the others are/proc, IOCTL, sockopt, shared memory, and so on. NetLink is characterized by asynchronous Full-duplex. NetLink uses 32-bit port addressing, called PID (not related to the process number), where the kernel's PID address is 0. The main characteristics of NetLink are as follows: 1 supports Full-duple

Fedora 20/21, delete old system kernel, fedora Kernel The kernel update speed of the Fedora system is very fast, which often leads to many versions during startup. If you do not clean up for a long time, the/boot may be fully occupied. The recent new Fedora 21 is even more likely to frequently upgrade the kernel. There

3.1. kernel architecture, 3.1 kernel architecture SELinux provides mandatory access control for all kernel resources. In his current format, SELinux is merged into the kernel through the LSM Framework. 3.1.1. LSM Framework The idea behind the LSM Framework is to allow the security module to be inserted into the

1, the function that prohibits kernel preemption is preempt_disable (), the method that allows kernel preemption is preempt_enable ()2, why call Preempt_disable () to close the preemption case before the real lockhttp://blog.csdn.net/kasalyn/article/details/11473885[CPP]View Plaincopy static inline void Raw_spin_lock (raw_spinlock_t *lock) { Preempt_disable (); Do_raw_spin_lock (lock);

1, Linux kernel parameter setting and INITRAMFS generation2. Linux kernel compilation and installationFirst, review the start-up processpost--boot order (BIOS)--bootloader (MBR)--kernel+ramdisk--root switchover (footfs)--/sbin/init (config file) Profile: Set default RunLevel--Develop system initialization scripts for system initialization--start service (/ETC/RC.

Experimental processClone the corresponding mengning/menu.git on 1.github2. Test Menuos, test fork Direct execution results3. Configure debug system, go to gdb Debug, use file Linux-3.18.6/vmlinux and target remote:1234 to configure loading initial debugging environment4. Set breakpoints in the Linux kernel process to create the points that may be used, respectively, sys_clone,do_fork,dup_task_struct,copy_thread,copy_process and Ret_from_fork.Summariz

doubly linked list The difference between the traditional linked list and the Linu kernel list: Figure A Figure II It can be seen that there is no commonality between the various links in the traditional list, because each data domain is different, and the structure of the linked list is embedded into the data domain structure in the Linux kernel, so that t

Author: Sandy Original works reproduced please indicate the source"Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000 "Experimental environment: C+linux64 bit (32-bit system may result in different)In accordance with the academic integrity of the terms, I guarantee that the answer for my original, all the references to the external materials have been marked by provenance. Source code and operating environment to build

《LinuxFull kernel AnnotationAnd 《LinuxKernel source code Scenario Analysis"(Previous and next)Simple Analysis and ComparisonAuthor: Zhao Yu Based on the general situation of the two books, the book "Situational Analysis" is written by Mao decao and others from Zhejiang University. It is entirely written by some computer professionals, therefore, the author has a high degree of computer expertise. This book makes people feel scared because of its lengt

PS. He Bong Original works reproduced please specify the source "Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-10000290001.mykernelExperimental Guidance (how the operating system works)Use the lab building virtual machine to open the shell and enter the following code 1 CD linuxkernel/linux-3.9.4 2 Qemu-kernel Arch/x86/boot/bzimage You can see the initial