kernel ost

Mutex object (Mutex)The kernel object can ensure that the thread has mutex access to a single resource. A mutex object contains a quantity, a thread ID, and a recursive counter. The behavior of the mutex object is the same as that of the key code segment, but the mutex object belongs to the kernel object, and the key code segment belongs to the user mode object. This means that mutex objects run slowly than

The Dojo/_base/kernel module is the Dojo Foundation module, which contains the most basic features of dojo.When using dojo, you generally do not need to refer to the module directly unless you extend the toolbox to add additional modules to it. Most dojo core modules rely directly or indirectly on the Dojo/_base/kernel module.1. Methods　　Deprecated (Behaviour,extra,removal)When the Isdebug configuration ite

1. Configure the Environment Operating system: CentOS 5.2 Download linux-2.6.18 version of kernel, URL: http://www.kernel.org Description: The compiled document is suitable for 2.6. More than 18 of the Linux kernel version, only the compiled Linux kernel version can not be lower than the Linux operating system itself

Tag:linux kernel cat>/etc/sysctl.confNet.ipv4.ip_forward = 0 means to turn on the routing function, 0 is off, 1 is onnet.ipv4.conf.all.rp_filter=1 is "tell" kernel enhanced inbound filtering (ingress filtering) and outbound filtering (egress filtering)Net.ipv4.conf.default.rp_filter = 1 Turn on reverse path filteringnet.ipv4.conf.default.accept_source_route = 0 packages that handle passive routesKERNEL.SY

Linux kernel has a very powerful function is to dynamically load the module, the module in this case is actually a kernel-supported applet. Before we actually get into the Linux kernel world, we can go through an addiction and load a kernel module on our own. Since the module is the program, we first write a small prog

Sleep a good sleep, very late, for a long time not so comfortable, today's task is not heavy, so the pressure is not big, oh, the weather is really cold, but the laboratory has air conditioning, I still like to stay here, there is a different feeling, after writing so many days, I do not understand the page gradually enlightened, And also made some friends, really very happy ah. Today will introduce you to add code to the kernel, take a look at it ~Fi

CentOS deletes the old (kernel) kernelWhen CentOS updates the kernel, many startup items will be added during startup. we can delete the old kernel and keep the latest kernel so that some disk space (/boot) can be released ).(1) view installed kernelsCommand: rpm-q kernelShow results:

Differences between Linux 0.12 kernel and modern kernel in memory management Linux 0.12 kernel memory management is relatively simple and crude. The kernel only uses one page Directory and can only map 4 GB linear space. Therefore, the virtual space (Logical space) of each process can only be 64 MB, A maximum of 64 pro

Linux network subsystem Kernel Analysis, linux subsystem Kernel Select route To send data packets to PC2, the linux system queries the route table to see that the 168.1.1.10 (Destination Address) gateway address is 192.168.1.1. In this case, the linux system selects Nic 1 to send data packets. 2. Neighbor subsystem (establish neighbor information through arp) When network adapter 1 is selected to send data,

Replace the kernel in ubuntu, and replace the kernel in ubuntu. First download the Linux kernel source code, and store it in the/usr/src directory, here for testing, is in ubuntu14.04, download the kernel is linux-3.14.10 2. Then enter the downloaded kernel linux-3.14.10 r

Linux kernel source code learning: Zombie processes, Linux kernel source code botnets Orphan and botnets After a normal sub-process fork parent process, the two establish a parent-child relationship. When the child process ends, it notifies the parent process, clears the memory occupied by the child process, and leaves its exit information (exit code) in the kernel