Function parameters with BTF
summary
Proposal shows using BTF to print return values and every argument for function graph and ftrace by building a quick lookup table that maps IPs to BTF prototypes, optionally generating per-function BPF bytecode for fast capture. It supports entry and exit reads, pointer dereference and snapshots of structures, and type-based enables like filter by prototype (e.g., all functions taking a socket). Prototype exists, no benchmarks yet, design aims for low overhead.
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chapters (7)
- 0:00Introduction to BTF function parameters
- 3:19Current BTF function graph features
- 6:50Tracing function parameters with BTF
- 10:02Filtering by parameter types
- 13:59Function-specific parameter tracing
- 17:10Global variables and object tracing
- 19:58Optimizing parameter tracing performance
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