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

Alexei Starovoitov
2024-02-21T01:24:28Z

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.