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Linux Kernel Programming

You're reading from   Linux Kernel Programming A comprehensive guide to kernel internals, writing kernel modules, and kernel synchronization

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Product type Paperback
Published in Mar 2021
Publisher Packt
ISBN-13 9781789953435
Length 754 pages
Edition 1st Edition
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Author (1):
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Kaiwan N. Billimoria Kaiwan N. Billimoria
Author Profile Icon Kaiwan N. Billimoria
Kaiwan N. Billimoria
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Table of Contents (19) Chapters Close

Preface 1. Section 1: The Basics
2. Kernel Workspace Setup FREE CHAPTER 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 18. Other Books You May Enjoy

Reporting and interpretation with a GUI frontend

More good news: the trace-cmd toolset includes a GUI frontend, for more human-friendly interpretation and analysis, called KernelShark (though, in my opinion, it isn't as full-featured as Trace Compass is). Installing it on Ubuntu/Debian is as simple as doing sudo apt install kernelshark.

Below, we run kernelshark, passing the trace data file output from our preceding trace-cmd record session as the parameter to it (adjust the parameter to KernelShark to refer to the location where you've saved the tracing metadata):

$ kernelshark ./trace_ps.dat

A screenshot of KernelShark running with the preceding trace data is shown here:

Figure 11.5 – A screenshot of the kernelshark GUI displaying the earlier-captured data via trace-cmd

Interesting; the ps process ran on CPU #2 (as we saw with the CLI version previously). Here, we also see the functions executed in the lower tiled horizontal...

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