MIME-Version: 1.0
References: <20220104080943.113249-1-jolsa@kernel.org>
In-Reply-To: <20220104080943.113249-1-jolsa@kernel.org>
From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Tue, 4 Jan 2022 10:53:19 -0800
Message-ID: <CAADnVQKZcr38aXwN6DyV7C9Ernfwkz5nsx8pXapKGNmnZ1JMDQ@mail.gmail.com>
Subject: Re: [RFC 00/13] kprobe/bpf: Add support to attach multiple kprobes
To:     Jiri Olsa <jolsa@redhat.com>
Cc:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Network Development <netdev@vger.kernel.org>,
        bpf <bpf@vger.kernel.org>, lkml <linux-kernel@vger.kernel.org>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@chromium.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
        "David S. Miller" <davem@davemloft.net>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Tue, Jan 4, 2022 at 12:09 AM Jiri Olsa <jolsa@redhat.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?