linux-kernel - Re: [RFC 00/13] kprobe/bpf: Add support to attach multiple kprobes

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Message-ID: <CAADnVQKZcr38aXwN6DyV7C9Ernfwkz5nsx8pXapKGNmnZ1JMDQ@mail.gmail.com>
Date:   Tue, 4 Jan 2022 10:53:19 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC 00/13] kprobe/bpf: Add support to attach multiple kprobes

On Tue, Jan 4, 2022 at 12:09 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> hi,
> adding support to attach multiple kprobes within single syscall
> and speed up attachment of many kprobes.
>
> The previous attempt [1] wasn't fast enough, so coming with new
> approach that adds new kprobe interface.
>
> The attachment speed of of this approach (tested in bpftrace)
> is now comparable to ftrace tracer attachment speed.. fast ;-)

What are the absolute numbers?
How quickly a single bpf prog can attach to 1k kprobes?