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The memory management subsystem is arguably the core of the Linux kernel, forming the foundation upon which the rest of the kernel and all of userspace operates. Despite its fundamental nature, it is surprisingly complicated and intricate. The Linux Memory Manager explores the Linux kernel’s memory management subsystem in detail. In this chapter we will explore the approach taken, who the book is aimed it, Many kernel books take the approach of providing an overview and then hand-waving away details, that is a top-down approach.. The key motivating philosophy of the Linux Memory Manager was to do entirely the opposite—explore each part of the memory management subsystem starting with basic principles, and then work from the bottom-up to form a broader understanding of the topic at hand. Within the kernel there can be no better source of truth than the source code itself, so we explore kernel functionality by exploring its code, which is reproduced in extensive snippets. In effect, this book tries to combine a source commentary with in depth analysis of concepts explored in both extensive discussions of the concepts The Linux Memory Manager (Early Access) © 2025 by Lorenzo Stoakes at hand along side a large number of diagrams which aim to put each concept into perspective. As the kernel is constantly evolving and this book necessarily must target a static kernel version, the intent is that by taking this approach, not only will the reader acquire understanding of fundamentals which are unlikely to change, but more importantly develop their skills at exploring kernel source so that they can adapt and update their knowledge to the latest version of the code. This book is aimed at developers who already have some fundamental understanding of the C programming language and operating system basics, and have an interest in exploring under the hood to see how Linux manages memory in as much detail as they may want to do so. This spans from that most wonderful of things—a genuinely curious (perhaps aspiring?) kernel hacker to a professional kernel developer, either working with or making use of the memory management subsystem. The intent is to bring out the hidden tribal knowledge within this codebase as much as possible and in the spirit of open source software make it more widely available to curious hackers all over the world!