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, which stores all the loaded modules of the new kernel. # Make install (new kernel installation) Note: The following error message may appear during make install: no module BusLogic found for kernel 2.4.12 mkinitrd failed this problem usually only occurs in the SCSI hard disk + VMWARE + REDHAT architecture, because BusLogic is compiledThe
The SELinux parameter was modified today when a software was installed. Modify the SELinux parameter value to disable. Causes the Linux system to fail to boot. The following error occurred Kernel Panic-not syncing:attempted to kill init!After the group to ask friends and their own operation and internet search, finally found a solution.When the Linux boot interfa
Linux kernel ———— queueLinux kernel--queueDefined:[CPP]View Plaincopy struct __kfifo{ unsigned int in; //Queue offset, write index unsigned int out; //Queue offset, read index unsigned int mask; unsigned int esize; void *data; } Use:Create a queue that creates and initializes a kfifo of size:[CPP]View Plaincopy __kfi
) Now, let's briefly introduce the following parts:1. Bootloader:The boot loader of the PC follows the Linux boot protocol 2.03, And the boot loader in the PC is run by the BIOS (And the Operating System Boot Loader (such as Lilo and grub) located in the hard disk MBR. BiosAfter hardware detection and resource allocation, read the boot loader in the hard disk MBR to the system ram, and then give the control to the operating system boot.Loader. Boot
"copyright notice: respect for the original, reproduced please retain the source: blog.csdn.net/shallnet. The article is for academic communication only and should not be used for commercial purposes " the memory image of a process consists of the following parts: code snippet, data segment, BSS segmentand Stack segments. And the area of the memory map,memory-mapped function mmap (), which is responsible for mapping the contents of the file to the virtual memory space of the process, through rea
Centos6.5 upgrade the Linux kernel, centos6.5linux Kernel1. Upgrade the kernel to 3.10.x.Method 1: Install yum cd /etc/yum.repos.d wget http://www.hop5.in/yum/el6/hop5.repoyum install kernel-ml-aufs kernel-ml-aufs-develMethod 2: rpm installation (recommended) rpm -ivh
The long and dark Prehistoric Age finally came to setup. In the setup Assembly function, Linux completes the transformation from prehistoric civilization to modern civilization by setting the PE bit of the Cr0 register (switching from the real mode to the protection mode. During the setup period, Linux has learned that the available memory resources in the world are far more than 1 MB. At this time, Linux's
This article is done original, reproduced please specify the source, respect for the original.Writing this article, I refer to some blogs on the Internet:Http://bbs.chinaunix.net/thread-3634524-1-1.htmlHttp://www.bkjia.com/gjrj/800182.htmlAlso refer to the "Linux driver development in detail" 3.4 chapters, to achieve the establishment of their own drive directory.The driving example in this article is: Linux
The Linux Kernel provides the copy_from_user ()/copy_to_user () function to copy the kernel state and user State data. However, these two functions cause blocking and cannot be used in hard or soft interruptions. These two special copy functions are generally used in functions similar to system calls. In the following code, the
when the Linux kernel is programmed, kernel code execution can only directly access the data in memory, and the file system on the hard disk must be indirectly read and written by the kernel. General kernel operation file read and write in three ways: 1. Through the/proc/fi
Chen Chaojan Original works reproduced please specify the source "Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000First, using the virtual machine of the experimental building, observe the relationship between the mykernel of a dead loop and the clock interrupt.步骤：cd LinuxKernel/linux-3.9.4qemu -
(1) Configuring the kernelHow to configure the kernel1. Make config text-based interactive configuration2. Make Menuconfig menu-based configuration in text modeConfiguring the kernel with make MenuconfigIn the configuration Blank is not selected, * means select and compile into kernel image file, M will compile into kernel module.Configuration results are saved i
list, while there are a,b,c 3 threads frequently access this list.So when a,b,c 3 threads access the list at the same time, if a gets a lock, then the B,C thread can only wait for a to release the lock before accessing the linked list.If A,b,c 3 threads are accessing different nodes of this list (for example, A is a modified node lista,b is a delete node listb,c is an append node LISTC),And these 3 nodes are not contiguous, then 3 threads running at the same time are not problematic.In this cas
used locks to protect your data ), these non-atomic bitwise functions may execute faster than the atomic bitwise functions. 2. spin lock The most common lock in Linux kernel is spin lock ). A spin lock can only be held by one executable thread. If an execution thread tries to obtain a contention (held) spin lock, the thread will keep repeating-Rotating-waiting for the lock to be available again. S
complete_init (void) { int result; Result=register_chrdev (Complete_major,"complete", complete_fops); if (result return result; if (complete_major==0) Complete_major=result; return 0; } void Complete_cleanup (void) { Unregister_chrdev (Complete_major,"complete"); } Module_init (Complete_init); Module_exit (Complete_cleanup); Test steps:1, Mknod/dev/complete creates a complete node, and on Linux the driver needs to
When I used bcp to back up data yesterday, the following error is always prompted and only several large tables can be exported at a time. This made me very strange that I failed to try it several times in a row. 00: 00000: 00053: 2007/07/23 09:07:14. 25 kernel cannot send, host process disconnected: Linux 15871 SUID: 100: 00000: 00056: 2007/07/23 09:07:14. 37 kernel
(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 N
One pageThe kernel takes the physical page as the basic unit of memory management; the Memory Management Unit (MMU) transforms the virtual address into a physicalAddresses, which are typically processed in pages. The MMU manages the tables in the system in the page size unit.32-bit system: Page size 4KB64-bit system: Page size 8KBThe kernel represents each physical page in the system with the corresponding
Introduction to Linux Kernel Now let's look at the architecture of the Gnu/linux operating system from a relatively high altitude. You can consider the operating system from two levels, as shown in Figure 2. Figure 2. Basic architecture of Gnu/linux operating system The top is the user (or application) space. This
AsLinuxOperating System CoreKernelThe latest stable version 2.6.24 is available todayRelease. According to the description of the kernel newbies website, linux Kernel 2.6.24 improved CFS, added tickless support for x86-64, PPC, UML, arm, MIPS and other architectures, added wireless driver and configuration interface, introduced anti-fragmentation patch, enable th
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