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Message-ID: <CAADnVQ+XpoCjL-rSz2hj05L21s8NtMJuWYC14b9Mvk7XE5KT_g@mail.gmail.com> Date: Tue, 29 Mar 2022 12:50:40 -0700 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Beau Belgrave <beaub@...ux.microsoft.com> Cc: Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, linux-trace-devel <linux-trace-devel@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, linux-arch <linux-arch@...r.kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com> 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 <beaub@...ux.microsoft.com> 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@...ux.microsoft.com> 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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