Re: [External] Re: [PATCH bpf-next 0/5] bpf: make tracing program support multi-attach

梦龙董
2024-02-21T02:35:46Z

Hello,

On Wed, Feb 21, 2024 at 9:24 AM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> On Mon, Feb 19, 2024 at 7:51 PM Menglong Dong
> <dongmenglong.8@bytedance.com> wrote:
> >
> > For now, the BPF program of type BPF_PROG_TYPE_TRACING is not allowed to
> > be attached to multiple hooks, and we have to create a BPF program for
> > each kernel function, for which we want to trace, even through all the
> > program have the same (or similar) logic. This can consume extra memory,
> > and make the program loading slow if we have plenty of kernel function to
> > trace.
>
> Should this be combined with multi link ?
> (As was recently done for kprobe_multi and uprobe_multi).
> Loading fentry prog once and attaching it through many bpf_links
> to multiple places is a nice addition,
> but we should probably add a multi link right away too.

I was planning to implement the multi link for tracing after this
series in another series. I can do it together with this series
if you prefer.

Thanks!
Menglong Dong