Re: [PATCH bpf-next 1/2] bpf, x86: patch tail-call fentry slot on non-IBT JITs

[Alexei Starovoitov]

On Fri, Mar 27, 2026 at 9:06 AM Takeru Hayasaka <hayatake396@xxxxxxxxx> wrote:
>
> Sorry about the top-posting.

yet you're still top posting :(

> That makes sense, thanks. I agree perf can provide visibility into which
> BPF programs are running, including tail-called ones.
>
> What I am still unsure about is packet-level / structured-data
> observability. My use case is closer to xdpdump-style debugging, where I
> want to inspect packet-related context from specific XDP leaf programs
> in a live pipeline.

see how cilium did it. with pwru tool, etc.