Re: [PATCH bpf-next 5/6] bpf: Support ->fill_link_info for perf_event

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On Sat, Jun 3, 2023 at 6:20 AM Andrii Nakryiko
<andrii.nakryiko@xxxxxxxxx> wrote:
>
> On Fri, Jun 2, 2023 at 1:52 AM Yafang Shao <laoar.shao@xxxxxxxxx> wrote:
> >
> > By adding support for ->fill_link_info to the perf_event link, users will
> > be able to inspect it using `bpftool link show`. While users can currently
> > access this information via `bpftool perf show`, consolidating the link
> > information for all link types in one place would be more convenient.
> >
> > Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
> > ---
> >  include/uapi/linux/bpf.h       |  6 ++++++
> >  kernel/bpf/syscall.c           | 45 ++++++++++++++++++++++++++++++++++++++++++
> >  tools/include/uapi/linux/bpf.h |  6 ++++++
> >  3 files changed, 57 insertions(+)
> >
> > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> > index 22c8168..87ecf8b 100644
> > --- a/include/uapi/linux/bpf.h
> > +++ b/include/uapi/linux/bpf.h
> > @@ -6442,6 +6442,12 @@ struct bpf_link_info {
> >                         __u64 addrs;
> >                         __u32 count;
> >                 } kprobe_multi;
> > +               struct {
> > +                       __aligned_u64 name; /* in/out: symbol name buffer ptr */
> > +                       __u64 addr;
> > +                       __u32 name_len;
> > +                       __u32 offset;
> > +               } perf_event;
>
> perf_event link could be:
>
> a) uprobe
> b) kprobe
> c) tracepoint
> d) generic perf_event (e.g., cpu_cycles)
>
> This interface doesn't make it very clear which one it is. And what's
> "name" for cpu_cycles event? What is the name for uprobe? Let's
> actually document this, otherwise it's hard to understand how this
> information can be interpreted...

Agreed. It would be better to have a document on it. I will do it.

-- 
Regards
Yafang





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