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You're reading from Linux Kernel Programming A comprehensive guide to kernel internals, writing kernel modules, and kernel synchronization

Product type Paperback

Published in Mar 2021

Publisher Packt

ISBN-13 9781789953435

Length 754 pages

Edition 1st Edition

Languages

Tools

Linux

Concepts

System Administration

Author (1):

Kaiwan N. Billimoria

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Table of Contents (19) Chapters

Preface

1. Section 1: The Basics

2. Kernel Workspace Setup FREE CHAPTER

3. Building the 5.x Linux Kernel from Source - Part 1

4. Building the 5.x Linux Kernel from Source - Part 2

5. Writing Your First Kernel Module - LKMs Part 1

6. Writing Your First Kernel Module - LKMs Part 2

7. Section 2: Understanding and Working with the Kernel

8. Kernel Internals Essentials - Processes and Threads

9. Memory Management Internals - Essentials

10. Kernel Memory Allocation for Module Authors - Part 1

11. Kernel Memory Allocation for Module Authors - Part 2

12. The CPU Scheduler - Part 1

13. The CPU Scheduler - Part 2

14. Section 3: Delving Deeper

15. Kernel Synchronization - Part 1

16. Kernel Synchronization - Part 2

17. About Packt

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18. Other Books You May Enjoy

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Running the test cases

To get a good idea regarding the system (scheduling) latencies, we shall run three test cases; in all three, the cyclictest app will sample system latency while the stress(1) utility is putting the system under load:

Raspberry Pi 3 model B+ (4 CPU cores) running the 5.4 32-bit RTL-patched kernel
Raspberry Pi 3 model B+ (4 CPU cores) running the standard 5.4 32-bit Raspberry Pi OS kernel
x86_64 (4 CPU cores) Ubuntu 20.04 LTS running the standard 5.4 (mainline) 64-bit kernel

We use a small wrapper script called runtest over the latency_test.sh script for convenience. It runs the latency_test.sh script to measure system latency while running the stress(1) utility; it invokes stress with the following parameters, to impose CPU, I/O, and memory loads on the system:

stress --cpu 6 --io 2 --hdd 4 --hdd-bytes 1MB --vm 2 --vm-bytes 128M --timeout 1h

(FYI, a later version of stress called...

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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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