Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By : Alex Gonzalez
Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By: Alex Gonzalez

Overview of this book

The Yocto Project has become the de facto distribution build framework for reliable and robust embedded systems with a reduced time to market.You'll get started by working on a build system where you set up Yocto, create a build directory, and learn how to debug it. Then, you'll explore everything about the BSP layer, from creating a custom layer to debugging device tree issues. In addition to this, you’ll learn how to add a new software layer, packages, data, scripts, and configuration files to your system. You will then cover topics based on application development, such as using the Software Development Kit and how to use the Yocto project in various development environments. Toward the end, you will learn how to debug, trace, and profile a running system. This second edition has been updated to include new content based on the latest Yocto release.
Table of Contents (13 chapters)
Title Page
Packt Upsell

Tracing and profiling with perf

The perf Linux tool can instrument the Linux kernel with both hardware and software performance counter events as well as static and dynamic kernel trace points. For this, it uses the kernel functionality we have seen in previous recipes, providing a common interface to all of them.

This tool can be used to debug, troubleshoot, optimize, and measure applications, workloads, or the full system, and covers the processor, kernel, and applications. Perf is probably the most complete of the tracing and profiling tools available for a Linux system.

Getting ready

The perf source is part of the Linux kernel. To include perf in your system, add the following to your conf/local.conf file:

IMAGE_INSTALL_append = " perf" 

Perf is also part of the tools-profile image feature, so you can also add it with the following:

EXTRA_IMAGE_FEATURES += "tools-profile" 

Perf is also included in the -sdk images.

To take the maximum advantage of this tool, we need to have symbols both in user...