netdev - Re: [PATCH 16/18] perf tools: Synthesize bpf_trampoline/dispatcher ksymbol event

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Message-ID: <CAPhsuW4cupgimwMHYzHXuTynxgs6oWuw46Z6DW2oyyAuszExmQ@mail.gmail.com>
Date:   Wed, 26 Feb 2020 21:50:30 -0800
From:   Song Liu <song@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Andrii Nakryiko <andriin@...com>, Yonghong Song <yhs@...com>,
        Song Liu <songliubraving@...com>,
        Martin KaFai Lau <kafai@...com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...hat.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 16/18] perf tools: Synthesize bpf_trampoline/dispatcher
 ksymbol event

On Wed, Feb 26, 2020 at 5:06 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Synthesize bpf images (trampolines/dispatchers) on start,
> as ksymbol events from /proc/kallsyms. Having this perf
> can recognize samples from those images and perf report
> and top shows them correctly.
>
> The rest of the ksymbol handling is already in place from
> for the bpf programs monitoring, so only the initial state
> was needed.
>
> perf report output:
>
>   # Overhead  Command     Shared Object                  Symbol
>
>     12.37%  test_progs  [kernel.vmlinux]                 [k] entry_SYSCALL_64
>     11.80%  test_progs  [kernel.vmlinux]                 [k] syscall_return_via_sysret
>      9.63%  test_progs  bpf_prog_bcf7977d3b93787c_prog2  [k] bpf_prog_bcf7977d3b93787c_prog2
>      6.90%  test_progs  bpf_trampoline_24456             [k] bpf_trampoline_24456
>      6.36%  test_progs  [kernel.vmlinux]                 [k] memcpy_erms
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Acked-by: Song Liu <songliubraving@...com>