Operating System Memory Swapping and Page Replacement

Memory management is a critical component of modern operating systems, directly affecting how efficiently applications run and how system resources are allocated. Understanding how systems swap data between physical RAM and secondary storage is essential for anyone looking to build high-performance software or manage system infrastructure. This text-based course guides you through the foundational concepts of virtual memory, paging, and swapping policies. You will transition from a basic understanding of computer memory to confidently analyzing and selecting the right page replacement algorithms for various computing workloads. What you will learn: Understand foundational memory concepts, including virtual memory, physical pages, and the mechanics of swapping; Compare classic page replacement algorithms such as FIFO, LRU, and optimal replacement policies; Analyze how swapping policies impact system performance, thrashing, and disk wear; Examine modern swapping contexts, including memory limits and cgroups in containerized environments; Practice solving conceptual scenarios and evaluation exercises to test your understanding of policy mechanics. We begin with essential terminology and the core mechanics of virtual memory before diving deep into the logical flow of different page replacement strategies. This course is designed for beginner software engineers, system administrators, and computer science students with no prior advanced operating systems experience. Start reading today to demystify how operating systems manage memory under pressure.