Re: [PATCH bpf-next 00/13] bpf: Add tracing_multi link support for bpf progs

On Sun, Aug 9, 2026 at 8:01 AM Leon Hwang <[email protected]> wrote:
>
> Similar to the tracing_multi link support for kernel functions [1], add
> support for bpf progs.
>
> When attaching to bpf progs, it must attaches to the target by text poke
> way.
>

Please spend a bit more human effort on justification for the change
and explaining your use case. In what case you'll be attaching to a
large amount of BPF programs such that attachment speed-up (if there
is any) matters.

Please do your homework. Generating code with AI is easy, reviewing
and making decisions about whether it's the right approach (and
ultimately supporting it long term) is still a human process, so let's
weigh that in.

> [1] https://lore.kernel.org/bpf/[email protected]/
>
> Leon Hwang (13):
>   bpf: Initialize ftrace_managed in bpf_trampoline_get
>   bpf: Factor out update_fentry_multi helper
>   bpf: Drop unnecessary ftrace_location() in update_fentry_multi()
>   bpf: Add tracing_multi link support for bpf progs
>   libbpf: Add tracing_multi link support for bpf progs
>   bpf: Add tracing_multi link fdinfo support for bpf progs
>   bpf: Add tracing_multi link info support for bpf progs
>   selftests/bpf: Add tracing_multi bpf prog attach test
>   selftests/bpf: Add tracing_multi bpf prog attach failure tests
>   selftests/bpf: Add tracing_multi bpf prog cookie test
>   selftests/bpf: Add tracing_multi bpf prog rollback test
>   selftests/bpf: Add tracing_multi bpf prog link info test
>   selftests/bpf: Test tailcall with fentry.multi
>
>  include/linux/bpf.h                           |   3 +
>  include/uapi/linux/bpf.h                      |   6 +-
>  kernel/bpf/trampoline.c                       |  87 +++---
>  kernel/bpf/verifier.c                         |  22 +-
>  kernel/trace/bpf_trace.c                      | 212 ++++++++++++---
>  tools/bpf/bpftool/link.c                      |  59 +++-
>  tools/include/uapi/linux/bpf.h                |   6 +-
>  tools/lib/bpf/bpf.c                           |   1 +
>  tools/lib/bpf/bpf.h                           |   2 +
>  tools/lib/bpf/libbpf.c                        |  39 ++-
>  tools/lib/bpf/libbpf.h                        |   4 +-
>  tools/lib/bpf/libbpf_internal.h               |   1 +
>  .../selftests/bpf/prog_tests/fill_link_info.c | 170 ++++++++++--
>  .../selftests/bpf/prog_tests/tailcalls.c      |  62 +++++
>  .../selftests/bpf/prog_tests/tracing_multi.c  | 254 ++++++++++++++++++
>  .../selftests/bpf/progs/tracing_multi_bpf.c   |  61 +++++
>  16 files changed, 869 insertions(+), 120 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/progs/tracing_multi_bpf.c
>
> --
> 2.55.0