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how-to-be-a-kernel-developer.md

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Strategies for getting started with kernel programming

  1. Strace all thing!
  2. Read some kernel code!
  3. Write a kernel module!
  4. Do the Eudalypta challenge
  5. Write your own operating system
  6. Do a Linux Kernel internship
    • Google Summer of Code
    • Outreach Program
  7. Linux Weekly News!

Why you should Lean It

  • Understanding Your Operation System Makes You A Better Programmer
  • Treat Your Programs as A Black Box
  • Your Operating System Is a Tool. Learn It.

Learn by Doing

PERF: TRACK L1 CACHE MISSES!

  1. Track L1 Cache Misses
  2. Flame Graph (function calling)

Ftrace: Tracing Kernel Functions

  • tracking TCP retransmits

/proc

  1. Pretty fun simple demo

    • run a program
    • get its PID
    • delete the executable
    • YOU CAN STILL RECOVER IT
    • ls /proc//exe
    • cat /proc//exe > demo_recover
    • ^C the program
    • grant execution permission to demo_recover
    • running demo_recover (Cool!)

  2. /proc/*/fd

References

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