Re: [PATCHv2 bpf-next 0/3] bpf: tracing_multi link info support

[Jiri Olsa <olsajiri@gmail.com>]

On Tue, Jun 23, 2026 at 01:51:29PM -0700, Andrii Nakryiko wrote:
> On Tue, Jun 23, 2026 at 7:24 AM Jiri Olsa <jolsa@kernel.org> wrote:
> >
> > hi,
> > adding link info support for tracing_multi link.
> >
> > Adding the kernel support with related selftests and bpftool support
> > to display the tracing_multi link info, the output looks like:
> >
> >   # bpftool link
> >   ...
> >   27: tracing_multi  prog 93
> >           attach_type trace_fentry_multi  obj_id 1  count 3
> >           btf_id           addr             cookie           func [module]
> >           91984            ffffffff824f4a24 a                bpf_fentry_test1
> >           91986            ffffffff824f6a84 1e               bpf_fentry_test2
> >           91987            ffffffff824f6a94 14               bpf_fentry_test3
> 
> kernel's bpf_tracing_link_show_fdinfo() emits cookie as decimal
> number, why go with hex here?

true, will switch to dec, thanks

jirka

> 
> >           pids test_progs(1462)
> >
> > thanks,
> > jirka
> >
> >
> > v1: https://lore.kernel.org/bpf/20260621204524.61067-1-jolsa@kernel.org/
> >
> > v2 changes:
> > - fix kernel symbol search logic [sashiko]
> > - typo fixes [bots]
> >
> >
> > ---
> > Jiri Olsa (3):
> >       bpf: Add tracing_multi link info support
> >       selftests/bpf: Add tracing_multi link info tests
> >       bpftool: Add tracing_multi link info output
> >
> >  include/uapi/linux/bpf.h                                |   9 +++
> >  kernel/trace/bpf_trace.c                                |  55 +++++++++++++++++
> >  tools/bpf/bpftool/link.c                                | 137 +++++++++++++++++++++++++++++++++++++++++
> >  tools/include/uapi/linux/bpf.h                          |   9 +++
> >  tools/testing/selftests/bpf/prog_tests/fill_link_info.c | 242 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tools/testing/selftests/bpf/progs/test_fill_link_info.c |   6 ++
> >  6 files changed, 458 insertions(+)