Book Image

Linux Kernel Programming

By : Kaiwan N. Billimoria
Book Image

Linux Kernel Programming

By: Kaiwan N. Billimoria

Overview of this book

Linux Kernel Programming is a comprehensive introduction for those new to Linux kernel and module development. This easy-to-follow guide will have you up and running with writing kernel code in next-to-no time. This book uses the latest 5.4 Long-Term Support (LTS) Linux kernel, which will be maintained from November 2019 through to December 2025. By working with the 5.4 LTS kernel throughout the book, you can be confident that your knowledge will continue to be valid for years to come. You’ll start the journey by learning how to build the kernel from the source. Next, you’ll write your first kernel module using the powerful Loadable Kernel Module (LKM) framework. The following chapters will cover key kernel internals topics including Linux kernel architecture, memory management, and CPU scheduling. During the course of this book, you’ll delve into the fairly complex topic of concurrency within the kernel, understand the issues it can cause, and learn how they can be addressed with various locking technologies (mutexes, spinlocks, atomic, and refcount operators). You’ll also benefit from more advanced material on cache effects, a primer on lock-free techniques within the kernel, deadlock avoidance (with lockdep), and kernel lock debugging techniques. By the end of this kernel book, you’ll have a detailed understanding of the fundamentals of writing Linux kernel module code for real-world projects and products.
Table of Contents (19 chapters)
1
Section 1: The Basics
6
Writing Your First Kernel Module - LKMs Part 2
7
Section 2: Understanding and Working with the Kernel
10
Kernel Memory Allocation for Module Authors - Part 1
11
Kernel Memory Allocation for Module Authors - Part 2
14
Section 3: Delving Deeper
17
About Packt

Visualization with LTTng and Trace Compass

The Linux Trace Toolkit Next Generation (LTTng) is a set of open source tools enabling you to simultaneously trace both user and kernel space. A bit ironically, tracing the kernel is easy, whereas tracing user space (apps, libraries, and even scripts) requires the developer to manually insert instrumentation (so-called tracepoints) into the application (the tracepoint instrumentation for the kernel is supplied by LTTng as kernel modules). The high-quality LTTng documentation is available online here: https://lttng.org/docs/v2.12/ (covering version 2.12 as of the time of writing).

We do not cover the installation of LTTng here; the details are available at https://lttng.org/docs/v2.12/#doc-installing-lttng. Once installed (it's kind of heavy – on my native x86_64 Ubuntu system, there are over 40 kernel modules loaded up pertaining to LTTng!), using LTTng - for a system-wide kernel session as we do here - is easy and...