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Assignment 2

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

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Assignment 2

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  1. Assignment 2 Sarah Diesburg co5641

  2. 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

  3. 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

  4. Assignment 2 • Goal • Expose everyone to useful tools before major coding begins • Have useful discussion about tools

  5. 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

  6. Assignment 2 Tool Choices • Git • 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/

  7. Assignment 2 Tool Choices • gdb • Find line of code where kernel oopsed • https://wiki.ubuntu.com/Kernel/KernelDebuggingTricks (bottom)

  8. 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

  9. Assignment 2 Tool Choices • Eclipse • Full-featured IDE • http://wiki.eclipse.org/HowTo_use_the_CDT_to_navigate_Linux_kernel_source

  10. Assignment 2 Tool Choices • Doxygen • Graphical documentation system • View dependency graphs, classes, defines, and comments • Example: http://www.vtk.org/doc/nightly/html/index.html • http://www.doxygen.org

  11. 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

  12. Assignment 2 Tool Choices • LTTng • Linux Trace Toolkit – next generation • Uses tracing to debug the kernel • Records low-level events • Customizable • https://lttng.org/

  13. 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/

  14. 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_Guide-en-US/s1-proc-topfiles.html

  15. Assignment 2 Tool Choices • A tool not mentioned here • Something you have seen in the kernel hacking menu? • Email me or Bobby for approval

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