Operating System Memory Management with brk and mmap

Deep down inside every running application is a complex system managing where data lives in physical and virtual memory. If you want to write highly optimized software or understand how modern systems handle resources, you must grasp the mechanics of low-level memory allocation. This text-only course demystifies how operating systems bridge the gap between user space applications and system memory. You will transition from treating memory allocation as a black box to understanding the exact system calls that power modern runtime environments. Through written explanations and code walkthroughs, you will explore virtual memory, page tables, and how custom allocators organize free space. What you'll learn: - Understand the core principles of virtual memory, page tables, and memory protection - Explore how the brk and sbrk system calls manipulate the program break to adjust heap size - Apply the mmap and munmap system calls to allocate memory pages and map files - Trace how standard memory allocators like malloc manage free lists and reduce fragmentation - Practice designing a basic custom memory allocator using low-level system calls - Analyze modern memory safety concepts and debugging techniques to prevent leaks This course begins with foundational concepts of operating system architecture and memory virtualization before diving into system calls. You will read through practical implementations, analyzing the trade-offs between different allocation strategies and learning how to avoid common pitfalls like memory leaks and fragmentation. This course is designed for beginner to intermediate software developers, computer science students, and systems enthusiasts who want to understand low-level programming. No prior systems-programming experience is required, though basic familiarity with C programming concepts is helpful. Start reading today to master the core mechanics of operating system memory management.