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Mastering Embedded Linux Programming

Mastering Embedded Linux Programming

By : Frank Vasquez, Chris Simmonds
4.6 (23)
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Mastering Embedded Linux Programming

Mastering Embedded Linux Programming

4.6 (23)
By: Frank Vasquez, Chris Simmonds

Overview of this book

If you’re looking for a book that will demystify embedded Linux, then you’ve come to the right place. Mastering Embedded Linux Programming is a fully comprehensive guide that can serve both as means to learn new things or as a handy reference. The first few chapters of this book will break down the fundamental elements that underpin all embedded Linux projects: the toolchain, the bootloader, the kernel, and the root filesystem. After that, you will learn how to create each of these elements from scratch and automate the process using Buildroot and the Yocto Project. As you progress, the book will show you how to implement an effective storage strategy for flash memory chips and install updates to a device remotely once it’s deployed. You’ll also learn about the key aspects of writing code for embedded Linux, such as how to access hardware from apps, the implications of writing multi-threaded code, and techniques to manage memory in an efficient way. The final chapters demonstrate how to debug your code, whether it resides in apps or in the Linux kernel itself. You’ll also cover the different tracers and profilers that are available for Linux so that you can quickly pinpoint any performance bottlenecks in your system. By the end of this Linux book, you’ll be able to create efficient and secure embedded devices using Linux.
Table of Contents (27 chapters)
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1
Section 1: Elements of Embedded Linux
10
Section 2: System Architecture and Design Decisions
18
Section 3: Writing Embedded Applications
22
Section 4: Debugging and Optimizing Performance

Chapter 20: Profiling and Tracing

Interactive debugging using a source-level debugger, as described in the previous chapter, can give you an insight into the way a program works, but it constrains your view to a small body of code. In this chapter, we will look at the larger picture to see whether the system is performing as intended.

Programmers and system designers are notoriously bad at guessing where bottlenecks are. So if your system has performance issues, it is wise to start by looking at the full system and then work down, using more sophisticated tools as you go. In this chapter, I'll begin with the well-known top command as a means of getting an overview. Often the problem can be localized to a single program, which you can analyze using the Linux profiler, perf. If the problem is not so localized and you want to get a broader picture, perf can do that as well. To diagnose problems associated with the kernel, I will describe some trace tools, Ftrace, LTTng, and BPF...

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