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Http://acm.pku.edu.cn/JudgeOnline/problem? Id = 1887
The topic description is complex. In fact, it is to find the longest descent subsequence, which is also a typical topic of dynamic planning. There are two algorithms for this type of problem: T
first, the kernel timer
1. Basic ConceptsIn some scenarios, we need to do some action after a certain time, but do not want to wait and waste the CPU, this time the timer is a very appropriate mechanism. The timer is used to perform a function at a future point in time to accomplish a specific task.
The kernel timer tells the kernel to use specific parameters to
Recently, I have been studying the Linux kernel. The kernel upgrade process is a learning process before I can carefully study the significance of the kernel, first of all, I have successfully compiled and upgraded from kernel 2.6.31.2 to 2.6.35.7 on Ubuntu. However, during compilation and upgrade on fedora, errors occ
Some articles have already introduced the android kernel. This series will analyze the android kernel from the perspective of the Linux kernel, hoping to provide useful information for beginners. This chapter briefly introduces the full picture of the android kernel and plays an interesting role. Starting from the next
Linux Kernel Design and Implementation of Reading Notes, Linux Kernel
Chapter 3 Process Management
1. fork system calls are returned twice from the kernel: one is returned to the sub-process and one is returned to the parent process. the task_struct structure is allocated by the slab distributor. 2.6 was previously placed at the bottom of the stack of the
Programs running in the Linux kernel should always prevent competing states caused by concurrency. This will cause the data structure to be broken down and cause the kernel to crash in severe cases. Therefore, the kernel synchronization technology is very important to the driver developed by the kernel. People who do n
Tags: des HTTP Io ar use the for SP strong File
The http://cn.opensuse.org/OpenSUSE_%E5%86%85%E6%A0%B8%E7%BC%96%E8%AF%91%E6%95%99%E7%A8%8B_ (kernel_2.6.x)Contents [hide]
1 Statement
2. Overview
3 Basic Knowledge
3.1 What is the kernel?
3.2 What is a patch
3.3 why re-compile the kernel?
3.4 If the upgrade fails, how can I restore the official kernel
RefHttp://www.zhizhihu.com/html/y2010/2292.htmlKernel FunctionsBelow is a list of some kernel functions available from the existing literature. As is the case with previous articles, every LaTeX notation for the formulas below is readily available from their A Lternate text HTML tag. I can not guarantee all of them is perfectly correct, thus use them at your own risk. The most of them has links to articles where they has been originally used or propos
Linux Kernel compilation details, Linux kernel details
After learning some online materials, I tried to find out and sort out this article.
We hope you will criticize and correct the mistakes due to their limited level and improper position.
Important references include:
Http://raspberrypi.stackexchange.com/questions/192/how-do-i-cross-compile-the-kernel-on-a-ub
Data exchange between linux kernel and user layer and linux Kernel
1. There are basically System Call interfaces file_operation interfaces: read write ioctl?
Module param of module driver (module parameters of module driver ).
2. kernel startup parameters :?By identifying the parameters passed by bootloader?_ Setup ("para_name =", parse_func)
3. asynchronous no
Chapter One: Introduction to the Kernel
The scope of the processor's activity at any given point in time:
A, run in the kernel space, in the process context, on behalf of a specific process execution;
b, running in kernel space, in the interrupt context, regardless of any process, handling a particular interrupt;
C, run in user space, execute user process.
When a
Specific questions
Reference Solutions
Solution Ideas
Deep solution
1. Specific questions:After porting the kernel of 3.6.6, download the startup card to die, specifically the serial printing information stuck in "uncompressing Linux ... done, booting the kernel."2. Reference Solution:According to the online statement to ensure that the following conditions:
2.1 Core clock frequenc
table data structure pointing to the user space and kernel space, so that the user state and the kernel state access to memory space is different. NBSP;2, user state and kernel kernel stacks: Each process in Linux has two stacks, respectively, for the process execution of the user state and the
1. Comparison of several kernel debugging tools
KDB: Debugging can only be performed at the compilation code level;The advantage is that two machines are not required for debugging.
GDB: it lacks some essential functions when debugging A module. It can be used to view the running status of the kernel, including disassembly of kernel functions.
Kgdb: it is conven
Use kgdb to debug Linux kernel and Kernel Modules
Created:Article attributes: originalArticle submission: xcspy (xcspy.com _ at_gmail.com)
Author: xcspy member ladybugE-mail: xcspy.com@gmail.comHome: www.xcspy.com
1. Comparison of several kernel debugging tools
KDB: Debugging can only be performed at the compilation code level;The advantage is that two machines a
turn from:Linux user space and kernel space (understanding high-end memory) Reference: 1. process kernel stack, user stack2. -linux kernel space 3.Linux Kernel Learning notes-5 memory managementLinux operating system and drivers run in kernel space, applications run in user
The mutex Kernel Object ensures that a thread exclusively accesses resources.
The behavior characteristics of mutex kernel objects are similar to those of key code segments, but they are kernel objects, and key code segments are user mode objects, as a result, the mutually exclusive kernel objects run at a lower speed
Features of Linux kernel development
Compared with applications in a user spaceProgramThere are many differences in development and kernel development. The most important differences include:
1) The C library cannot be accessed during kernel programming.
2) gnu c must be used for Kernel programming.
3) There is
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