Linux Tracing updates
summary
Persistent ring buffer keeps pre-crash kernel traces across reboot by reserving memory and exposes a bootmap backup to avoid overwrite; a real case shows it captured repeated hardware-breakpoint hits that froze an ARM64 board and pointed to a single-step workaround. Function-graph tracer now decodes parameter names and return values via BTF integration, and ftrace/uprobes/fprobes get performance work (about 20% improvement in some paths) with an x86-specific uprobes syscall-based trampoline to cut trap overhead. User events and a JSON boot config enable early, flexible tracing.
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chapters (6)
- 0:00Introduction to Linux tracing
- 1:11Persistent ring buffer feature
- 8:43Tracer updates and improvements
- 19:13Probes and events optimizations
- 27:01Advanced tracing mechanisms
- 34:57Conclusion and Q&A
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