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Linux Kernel Programming - Second Edition

You're reading from Linux Kernel Programming - Second Edition

Product type Book

Published in Feb 2024

Publisher Packt

ISBN-13 9781803232225

Pages 826 pages

Edition 2nd Edition

Languages

Concepts

System Administration

Author (1):

Kaiwan N. Billimoria

Table of Contents (16) Chapters

Preface

1. Linux Kernel Programming – A Quick Introduction

2. Building the 6.x Linux Kernel from Source – Part 1

3. Building the 6.x Linux Kernel from Source – Part 2

4. Writing Your First Kernel Module – Part 1

5. Writing Your First Kernel Module – Part 2

6. Kernel Internals Essentials – Processes and Threads

7. Memory Management Internals – Essentials

8. Kernel Memory Allocation for Module Authors – Part 1

9. Kernel Memory Allocation for Module Authors – Part 2

10. The CPU Scheduler – Part 1

11. The CPU Scheduler – Part 2

12. Kernel Synchronization – Part 1

13. Kernel Synchronization – Part 2

14. Other Books You May Enjoy

15. Index

Examining the process VAS

We have already covered the layout – the segments or mappings – that every process’s VAS is made up of (see the Understanding the basics of the process Virtual Address Space (VAS) section in Chapter 6, Kernel Internals Essentials – Processes and Threads). We learned that the process VAS consists of various mappings or segments; among them are text (code), data segments, library mappings, and at least one stack. Here, we will expand greatly on that discussion.

Being able to dive deep into the kernel and see various runtime values is an important skill for a developer like you (as well as for the app user, QA, sysadmin, DevOps folks, and so on). The Linux kernel provides us with an amazing interface to do precisely this – it’s, you guessed it, the proc filesystem (procfs).

This pseudo filesystem is always present on Linux (at least it should be) and is mounted under /proc by default. The procfs system has two...

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Authors (1)

Kaiwan N. Billimoria

Kaiwan N. Billimoria taught himself BASIC programming on his dad's IBM PC back in 1983. He was programming in C and Assembly on DOS until he discovered the joys of Unix, and by around 1997, Linux! Kaiwan has worked on many aspects of the Linux system programming stack, including Bash scripting, system programming in C, kernel internals, device drivers, and embedded Linux work. He has actively worked on several commercial/FOSS projects. His contributions include drivers to the mainline Linux OS and many smaller projects hosted on GitHub. His Linux passion feeds well into his passion for teaching these topics to engineers, which he has done for well over two decades now. He's also the author of Hands-On System Programming with Linux, Linux Kernel Programming (and its Part 2 book) and Linux Kernel Debugging. It doesn't hurt that he is a recreational ultrarunner too.

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