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

梦龙董
2024-02-21T02:45:59Z

On Wed, Feb 21, 2024 at 10:35 AM 梦龙董 <dongmenglong.8@bytedance.com> wrote:
>
> 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.
>

Should I introduce the multi link for tracing first, then this series?
(Furthermore, this series seems not necessary.)

> Thanks!
> Menglong Dong