Transcript Assignment 2 - UNI Department of Computer Science

Assignment 2
SARAH DIESBURG
CO5641
Assignment 2
Other tools exist to ease kernel development and debugging
Pick a tool not already explained, set it up, and give a brief (10-15
minute) presentation
◦ Powerpoint and/or demo
Assignment 2
Try to answer the following questions
◦ What is the tool’s primary purpose?
◦ How useful is this tool?
◦ How easy to set up?
Give a quick tutorial on basic usage
◦ Link to references
Assignment 2
Goal
◦ Expose everyone to useful tools before major coding begins
◦ Have useful discussion about tools
Assignment 2
Clarification
◦ You don’t have to know everything about your chosen tool
◦ Give us a good idea
If you have trouble setting up the tool…
◦ Create a presentation instead of a demo to discuss tool
◦ Cite your web sources
◦ Explain what the troubles were
Assignment 2 Tool Choices
Git
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Open source distributed version control system
Initially developed by Linus Torvalds for Linux kernel development
Necessary tool
Can use departmental servers (e.g. shell, linprog)
http://git-scm.com/
Assignment 2 Tool Choices
gdb
◦ Find line of code where kernel oopsed
◦ https://wiki.ubuntu.com/Kernel/KernelDebuggingTricks (bottom)
Assignment 2 Tool Choices
kgdb
◦ Used along with gdb to debug the Linux kernel
◦ Requires two machines that are connected via a serial connection or virtual
machine
◦ Look at kernel hacking menu in “make menuconfig”
◦ http://kgdb.geeksofpune.in/tocdebug.htm
Assignment 2 Tool Choices
Eclipse
◦ Full-featured IDE
◦ http://wiki.eclipse.org/HowTo_use_the_CDT_to_navigate_Linux_kernel_sou
rce
Assignment 2 Tool Choices
Doxygen
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Graphical documentation system
View dependency graphs, classes, defines, and comments
Example: http://www.vtk.org/doc/nightly/html/index.html
http://www.doxygen.org
Assignment 2 Tool Choices
Capturing kernel oops
◦ Sometimes kernel oops are not recordable and scroll off the screen
◦ General presentation to capture oops messages, can include
◦ Making console font smaller – will not scroll off screen
◦ Serial connection
◦ Virtual machine with minicom
◦ Remote logging
◦ In-depth presentation of Magic SysRq
◦ Use this link to get started:
https://wiki.ubuntu.com/Kernel/KernelDebuggingTricks
Assignment 2 Tool Choices
LTTng
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Linux Trace Toolkit – next generation
Uses tracing to debug the kernel
Records low-level events
Customizable
https://lttng.org/
Assignment 2 Tool Choices
Local indexers
cscope
◦ Console-mode interface to search source code
◦ http://en.wikipedia.org/wiki/Cscope
Alternatively, CCTree as a native Vim plugin
◦ http://www.vim.org/scripts/script.php?script_id=2368
etags/ctags
◦ Generate tag files for emacs, vim
◦ http://www.delorie.com/gnu/docs/emacs/etags.1.html
◦ http://ctags.sourceforge.net/
Assignment 2 Tool Choices
/proc files
◦ These special files report status information from the kernel to user space.
◦ (some examples) http://www.centos.org/docs/5/html/Deployment_Guideen-US/s1-proc-topfiles.html
Assignment 2 Tool Choices
A tool not mentioned here
◦ Something you have seen in the kernel hacking menu?
◦ Email me or Bobby for approval