Linux Kernel Internals Linux 内核底层
Syscalls, VFS, memory, io_uring, eBPF, tracing — notes on how the kernel actually works under the hood. Drawn from mainline kernel sources and public documentation.
系统调用、VFS、内存管理、io_uring、eBPF、tracing——内核底层到底是怎么跑的。所有内容均来自主线内核源码和公开资料。
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io-uring Linux Next-Generation Asynchronous I/O InterfaceEN
io_uring is an asynchronous I/O interface introduced in Linux 5.1 (May 2019), designed by Jens Axboe to replace the older aio and POSIX AIO interfaces. This post covers what problems it was built t...
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Linux内存管理深度解析（一）：从文件系统缓存到现代内存优化技术中文
在Linux操作系统中，内存管理是系统性能和稳定性的基石。随着硬件技术的发展和应用场景的日益复杂，Linux内核的内存管理机制也在不断演进。本文将基于对Linux内存管理核心概念的深入理解，结合最新的技术进展和互联网信息，为您呈现一份全面且更新的Linux内存管理指南。我们将从文件系统缓存和匿名页的交换机制入手，逐步探讨页面回收、脏页回写等关键环节，并引入zRAM、Zswap等现代内存优化技...
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fspy (1): Trace Filesystem Activity and I/O Patterns in Your Linux ApplicationsEN
Linux has good tools for tracing syscalls (strace) and profiling CPU, but watching filesystem activity at the file level — which files an application opens, how often, how much data — is surprising...
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Challenges of Deploying eBPF-Based Tracing in Embedded Systems, and Alternatives in Embedded Platforms (Libtracefs/libtraceevent)EN
Challenges of Deploying eBPF-Based Tracing in Embedded Systems, and Alternatives in Embedded Platforms (Libtracefs/libtraceevent)Presentation OverviewThis page summarizes the key insights from my p...
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Printing Stack Traces in the Linux KernelEN
📌 Printing Stack Traces in the Linux KernelPrinting stack traces is one of the most valuable debugging tools available to kernel developers. When something goes wrong in kernel space, the call stac...
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Shared Memory in Linux Inter-Process CommunicationEN
Shared Memory in Linux Inter-Process Communication (IPC)In Linux, shared memory is an efficient method for inter-process communication (IPC). Through shared memory, multiple processes can access th...
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Linux System Calls: An In-Depth LookEN
What are System Calls?System calls (syscalls) are the fundamental interface through which user-space applications interact with the Linux kernel. They are the gateway for processes to request privi...
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Linux VFS架构、数据结构与文件系统注册中文
Linux VFS深度解析:架构、数据结构与文件系统注册1. VFS概述Virtual File System(虚拟文件系统,VFS)是Linux内核中的一个软件层,它为用户空间程序提供了统一的文件系统接口。VFS的核心作用是抽象底层文件系统的差异,使得应用程序可以使用相同的系统调用(如open、read、write)来操作不同类型的文件系统(ext4、XFS、Btrfs等)。1.1 VFS...
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Linux 设备管理全解析：从 devfs 到 udev/sysfs 的演进中文
Linux 设备管理全解析：从 devfs 到 udev/sysfs 的演进引言在 Linux 系统中，设备管理是操作系统的核心功能之一。遵循”一切皆文件”的 Unix 哲学，Linux 将硬件设备抽象为文件，存放在 /dev 目录下供用户进程操作。然而，设备管理机制经历了从静态到动态、从内核空间到用户空间的重大演进。本文将深入探讨 Linux 设备管理的发展历程，重点解析 devfs、tm...
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Heap and Stack, one Minimalist heap AllocatorEN
📚 Introduction to the Heap💡 What is the Heap?The heap is a region of memory used for dynamic memory allocation — memory that is allocated and freed at runtime rather than at compile time.In C, you ...