Towards data type profiling

on YouTube ↗47m

" summary

A working prototype links perf memory sampling with DWARF location lists to map PMU load/store samples to C data types and struct fields, and lands as perf support producing type-sorted reports and per-struct field hotness (example: an RB node with 6 samples split 3/1/2 across fields). It uses Intel/AMD/ARM precise sampling, runs offline decode via objdump (performance issues mitigated), rejects complex DWARF expressions, and reports many unknown mappings where debug info or compiler optimizations lose type/location.

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" chapters (10)

1. 0:00Introduction to profiling
2. 3:04PMU and sampling mechanisms
3. 6:35Mapping memory to DWARF
4. 10:31Data structure analysis
5. 16:00Addressing missing debug info
6. 20:05Compiler optimization impact
7. 26:03Language and architecture
8. 30:18Tooling performance issues
9. 34:04Summary and future outlook
10. 36:49Discussion and Q&A