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

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.