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Date:   Tue, 29 Mar 2022 12:50:40 -0700
From:   Alexei Starovoitov <>
To:     Beau Belgrave <>
Cc:     Steven Rostedt <>,
        Masami Hiramatsu <>,
        linux-trace-devel <>,
        LKML <>, bpf <>,
        Network Development <>,
        linux-arch <>,
        Mathieu Desnoyers <>
Subject: Re: [PATCH] tracing/user_events: Add eBPF interface for user_event
 created events

On Tue, Mar 29, 2022 at 11:19 AM Beau Belgrave
<> 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 <>

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.

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