~/talk

Implementing sframes

on YouTube 24m
Talkat Linux Plumbers Conference 2023 · 2023-11-13..11-15· [compilers-and-language-design]

speakers

name:Steven Rostedt
links:none on file
name:Indu Bhagat
links:none on file

resources

video:https://youtu.be/gqtl58s8SnQ
slides:none on file

summary

sframes are implemented in binutils to let the kernel unwind user stacks without frame pointers by reading an ELF sframe section for static binaries, but user-space reads can fault so unwinding cannot run in NMI/interrupt context and instead uses irq_work defer to schedule a safe ptrace-path copy. Perf and ftrace need changes to avoid repeatedly copying identical user stacks. Dynamically linked objects and JIT code require a registration mechanism (system call or user-space table) so generated code can provide sframe metadata at load time.

AI-written summary · about

chapters (6)

  1. 0:00Stack tracing challenges
  2. 1:41The ORC unwinder
  3. 4:45Introduction of S frames
  4. 7:13Implementing S frames
  5. 10:55Performance and mapping
  6. 12:59JIT and future directions

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