linux finite element analysis

table. Linux provides two interfaces for this purpose: Static inline void list_add (struct list_head * New, struct list_head * head); static inline void list_add_tail (struct list_head * New, struct list_head * head ); Because the Linux linked list is a cyclic table, and the next and Prev of the header point to the first and last nodes in the linked list respectively, The list_add and list_add_tail are not

describes some principles.1. Memory-based analysis and detection process In a Linux system, the ps-aux command is generally executed to view processes. The essence is to read/proc/pid/to obtain process information. In kernel task_struct Note 3 (process structure), it also contains process pid, creation time, image path, and other information. That is to say, the relevant information of each process can be

Tag: kernel ble roc SM waits for event signal storage to get processedWhat is a process?A process is an instance of program execution and a migration process for a finite state machine. The difference between process and procedure: dynamic and static;Related processes of WINDOWS10List all running/active processes with Ps-a in LinuxUsing the top command in Linux, you can monitor the resources used by differe

refers to the period before the directory is created and reported to be added to watch. When another file or directory is created in the directory, the event is missed. iNotify allows two times of add_watch for the same directory, but because the hard disk needs to be accessed during the add operation to ensure that the directory exists before it can be added, a cache is provided, path In the first solution, the problem of missed events is solved through post-event scanning, but does it make s

Learning this article can be a comprehensive and profound understanding of Linux outages. This article makes a complete analysis of the requirements, management mechanisms, interrupt implementations, interrupt interfaces (top and bottom halves) of the Linux outage, and drive usage.I. Interruption of demandSoftware is demand-driven and software is designed to addr

the libraries standard of competing with NPTL for the next generation of Linux POSIX lines.3. Other efficient threading mechanismsThe scheduler activations cannot be mentioned here. The multi-threaded kernel structure published in ACM in 1991 affected the design of many multithreaded cores, including Mach3.0, NetBSD, and commercial versions of digital UNIX (now called Compaq True64 Unix). Its essence is to use user-level thread scheduling, as much as

BlockThe super block structure represents a file system. It contains the information required to manage the file system, including file system names (such as ext2), file system size and status, block device references and metadata information (such as free lists, and so on). A super block is typically stored on a storage medium, but it can be created in real time if the Super block does not exist. You can find the Super block structure in the./linux/

Analysis of Linux 2.6 scheduling system content: td> 1. Preface 2. The n

, supports the semantics of multiple processes such as fork (2) and exec (2). Therefore, they can be used in multi-threaded environments. They are more flexible than POSIX timer [2, the root cause is that the timer management is unified under one of the basic Unix/Linux philosophy-"Everything is a file. Minimum heap implementation Timer The minimum heap refers to the heap that satisfies that each node except the root node is not smaller than its pare

Linux tasklet Analysis notes Chapter 1: During initialization, the driver creates a tasklet through the task_init function, then calls the tasklet_schedule function to place the tasklet in the header of the tasklet_vec linked list, and wakes up the background thread ksoftirqd. When the backend thread ksoftirqd runs the call _ do_softirq, The tasklet_action function corresponding to the interrupt number task

Linux Input Analysis II: Deconstructing input_handler, Input_core, Input_deviceInput and output is a means of interaction between users and products, so input-driven development is common in Linux-driven development. At the same time, the layered architecture idea of input subsystem is very representative and advanced in the