Re: [PATCH] tracing/user_events: Add eBPF interface for user_event created events

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

On Tue, Mar 29, 2022 at 11:19 AM Beau Belgrave
<beaub@xxxxxxxxxxxxxxxxxxx> wrote:
>
> Send user_event data to attached eBPF programs for user_event based perf
> events.
>
> Add BPF_ITER flag to allow user_event data to have a zero copy path into
> eBPF programs if required.
>
> Update documentation to describe new flags and structures for eBPF
> integration.
>
> Signed-off-by: Beau Belgrave <beaub@xxxxxxxxxxxxxxxxxxx>

The commit describes _what_ it does, but says nothing about _why_.
At present I see no use out of bpf and user_events connection.
The whole user_events feature looks redundant to me.
We have uprobes and usdt. It doesn't look to me that
user_events provide anything new that wasn't available earlier.