Linux Virtual Memory and Page Cache Fundamentals

Have you ever wondered how Linux handles memory behind the scenes to keep your applications running fast? Understanding the virtual memory system is the key to diagnosing performance bottlenecks and writing resource-efficient code. This text-based course guides you through the inner workings of Linux memory management without requiring complex prerequisites. You will start with the absolute basics of physical and virtual memory, learn how the operating system maps address spaces, and discover how the unified page cache accelerates file read and write operations. What you will learn: Understand virtual memory architecture, page tables, and address translation; Explore the role of the Linux page cache in optimizing disk I/O; Analyze page replacement algorithms and how the kernel handles page faults; Implement and manage memory-mapped files using system calls; Monitor system memory usage and diagnose cache-related performance issues using modern command-line utilities. This course begins with core definitions and structural concepts before guiding you through practical scenarios and real-world system behaviors. It is designed for software developers, system administrators, and tech enthusiasts who want a solid, foundational grasp of Linux memory internals. Dive into the text, complete the reading exercises, and take control of your system's performance today.