Eternity1824 commented on PR #919:
URL:
https://github.com/apache/skywalking-banyandb/pull/919#issuecomment-3743832225
I've added the KTM metrics validation in the FODC integration tests.
Regarding the implementation, I refactored the eBPF module to use
Tracepoints instead of the previous fentry-based approach for syscall tracking,
mainly to improve robustness and portability:
- Verifier robustness on recent kernels:
Testing on newer kernels (e.g., 6.14 on x86) showed that syscall wrappers
expose parameters via pt_regs in BTF, which makes multi-argument fentry
programs prone to verifier rejections due to signature mismatches.
- Stability & maintainability:
Syscall tracepoints provide a stable ABI, allowing direct access to
parameters and return values (args[] / ret) without relying on
architecture-specific register conventions. This results in more predictable
CO-RE behavior across kernel versions and architectures (x86 / ARM64).
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