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You're reading from Linux Kernel Programming

Product type Book

Published in Mar 2021

Publisher Packt

ISBN-13 9781789953435

Pages 754 pages

Edition 1st Edition

Languages

Concepts

System Administration

Author (1):

Kaiwan N. Billimoria

Table of Contents (19) Chapters

Preface

1. Section 1: The Basics

2. Kernel Workspace Setup

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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The process VAS – the full view

Once again, refer to Figure 7.1; it shows the actual process VAS layout for a single 32-bit process. The reality, of course – and this is key – is that all processes alive on the system have their own unique user-mode VAS but share the same kernel segment. For some contrast from Figure 7.1, which showed a 2:2 (GB) VM split, the following figure shows the actual situation for a typical IA-32 system, with a 3:1 (GB) VM split:

Figure 7.5 – Processes have a unique user VAS but share the kernel segment (32-bit OS); IA-32 with a 3:1 VM split

Notice in the preceding figure how the address space reflects a 3:1 (GB) VM split. The user address space extends from 0 to 0xbfff ffff (0xc000 0000 is the 3 GB mark; this is what the PAGE_OFFSET macro is set to), and the kernel VAS extends from 0xc000 0000 (3 GB) to 0xffff ffff (4 GB).

Later in this chapter, we will cover the...

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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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