IoT & Hardware
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You're reading from  Embedded Linux Projects Using Yocto Project Cookbook

Product typeBook
Published inMar 2015
Publisher
ISBN-139781784395186
Edition1st Edition
Tools
Yocto Project
Concepts
Embedded Systems
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Author (1)
Alex Gonzalez
Alex Gonzalez
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Alex Gonzalez

Alex González is a software engineering supervisor at Digi International and product owner of the Digi Embedded Yocto distribution. He started working professionally with embedded systems in 1999 and the Linux kernel in 2004, designing products for voice and video over IP networks, and followed his interests into machine-to-machine (M2M) technologies and the Internet of Things. Born and raised in Bilbao, Spain, Alex has an electronic engineering degree from the University of the Basque Country and he received his MSc in communication systems from the University of Portsmouth.
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Using the kernel function tracing system

Recent versions of the Linux kernel contain a set of tracers that, by instrumenting the kernel, allow you to analyze different areas like:

  • Interrupt latency

  • Preemption latency

  • Scheduling latency

  • Process context switches

  • Event tracing

  • Syscalls

  • Maximum stack

  • Block layer

  • Functions

The tracers have no performance overhead when not enabled.

Getting ready...

The tracing system can be used in a wide variety of debugging scenarios, but one of the most common tracers used is the function tracer. It instruments every kernel function with a NOP call that is replaced and used to trace the kernel functions when a trace point is enabled.

To enable the function tracer in the kernel, use the CONFIG_FUNCTION_TRACER and CONFIG_FUNCTION_GRAPH_TRACER configuration variables.

The kernel tracing system is controlled via a tracing file in the debug filesystem, which is mounted by default on Yocto's default images. If not, you can mount it with:

$ mount -t debugfs nodev /sys/kernel/debug...
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Embedded Linux Projects Using Yocto Project Cookbook
Published in: Mar 2015Publisher: ISBN-13: 9781784395186
© 2015 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Alex Gonzalez

Alex González is a software engineering supervisor at Digi International and product owner of the Digi Embedded Yocto distribution. He started working professionally with embedded systems in 1999 and the Linux kernel in 2004, designing products for voice and video over IP networks, and followed his interests into machine-to-machine (M2M) technologies and the Internet of Things. Born and raised in Bilbao, Spain, Alex has an electronic engineering degree from the University of the Basque Country and he received his MSc in communication systems from the University of Portsmouth.
Read more about Alex Gonzalez

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