What This Document Is
This document is a set of lecture materials exploring the internal workings of a Linux operating system, specifically focusing on kernel-level objects and how to observe them. It delves into the relationship between user-space applications and the kernel, and how developers can gain insight into kernel data structures. The core subject matter revolves around Loadable Kernel Modules (LKMs) and their use in examining system information, with a particular emphasis on network devices and physical memory. It’s designed for students learning about operating system design and implementation.
Why This Document Matters
This resource is invaluable for computer science students enrolled in courses on operating systems, kernel development, or computer graphics – particularly those using a Linux environment. It’s most beneficial when you’re tasked with understanding how system resources are managed, how device drivers interact with hardware, and how to debug kernel-level issues. Students preparing to write their own kernel modules or analyze system behavior will find this material particularly helpful. It bridges the gap between theoretical concepts and practical application within a Linux system.
Common Limitations or Challenges
This material assumes a foundational understanding of C programming and basic Linux system administration. It does *not* provide a complete, standalone tutorial on Linux kernel development; rather, it builds upon existing knowledge. It also doesn’t offer pre-built code solutions or step-by-step instructions for implementing specific drivers. The document focuses on conceptual understanding and observation techniques, and doesn’t cover all aspects of device driver development, such as error handling or complex hardware interactions.
What This Document Provides
* An overview of how to create Loadable Kernel Modules (LKMs) for observing kernel data.
* Discussion of the differences and interactions between user-space and kernel-space.
* Exploration of the structure and purpose of key kernel data structures, such as `net_device`.
* Insights into the role of helper functions provided by the Linux kernel for driver development.
* Conceptual understanding of memory mapping techniques within the kernel.
* Examination of how to utilize tools to inspect kernel memory and data structures.
