linux

Tags: computers

• Currently Linux plumber and hobbiest occupy two different workds
  • Desktop linux and DevOps middleware are paid employees, vs poeple who use suckless softawre, musl-based distros

Crashes

• Breakpad and Crashpad from google allow for dump tracing
  • https://chromium.googlesource.com/breakpad/breakpad/
  • https://docs.microsoft.com/en-us/windows/win32/debug/minidump-files
  • https://bugzilla.mozilla.org/show_bug.cgi?id=1588530
• https://www.instapaper.com/read/1524786035
• Linux uses signals to register SIGABRT/BUS/etc
• By default, signal handlers are called on the same stack where the crash occured, which is fine for most cases execpt a stack overflow
• Apple computers use Mach exceptions: https://flylib.com/books/en/3.126.1.109/1/
• https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/KernelProgramming/Mach/Mach.html
• https://docs.darlinghq.org/internals/macos-specifics/mach-ports.html

Tracing

• https://jvns.ca/blog/2017/07/05/linux-tracing-systems/
• ebpf

Debian

perf performance issues

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911815
  • when not linked against libbfd, perf calls out to addr2line for every address lookup, which is infeasible
  • possible solution: https://michcioperz.com/post/slow-perf-script/
  • patches: https://lore.kernel.org/linux-perf-users/[email protected]/

Linux Audio

• Pipewire: http://pipewire.org
  • provides low latency, graph based processing for audio

LD_PRELOAD and LD_LIBRARY_PATH

• Different usages on os x, uses DYLD_LIBRARY_PATH and DYLD_FALLBACK_LIBRARY_PATH
  • See https://stackoverflow.com/questions/3146274/is-it-ok-to-use-dyld-library-path-on-mac-os-x-and-whats-the-dynamic-library-s
  • https://github.com/Jackett/Jackett/issues/5589

Linux Kernel Headers

• https://lwn.net/ml/linux-kernel/[email protected]/

Cellular Modems

• https://forums.lenovo.com/t5/Ubuntu/P14s-Gen-3-Ubuntu-22-Fibocom-L860-GL-not-working/m-p/5177047?page=4#5967453
• https://forums.lenovo.com/t5/Fedora/Fedora-on-X1-Extreme-Gen-3-WWAN-Fibocom-L860-GL-4G-LTE-Advanced-Cat-16-not-working/m-p/5044699?page=7
• https://support.lenovo.com/us/en/solutions/pd031426

io_uring

• https://news.ycombinator.com/item?id=36353845

Huge Pages

-https://www.evanjones.ca/hugepages-are-a-good-idea.html