linux-kernel - Re: [PATCH v4 bpf-next 2/2] selftests/bpf: add a ksym iter subtest

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Message-ID: <CAEf4BzYMggGGti_w+_V=2ZULHztnUBEJyGvFeG=q5=7UMtJeQg@mail.gmail.com>
Date:   Fri, 8 Jul 2022 15:27:35 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alan Maguire <alan.maguire@...cle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Vernet <void@...ifault.com>, swboyd@...omium.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Kenny Yu <kennyyu@...com>,
        Geliang Tang <geliang.tang@...e.com>,
        Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
        bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 bpf-next 2/2] selftests/bpf: add a ksym iter subtest

On Wed, Jul 6, 2022 at 6:17 AM Alan Maguire <alan.maguire@...cle.com> wrote:
>
> add subtest verifying BPF ksym iter behaviour.  The BPF ksym
> iter program shows an example of dumping a format different to
> /proc/kallsyms.  It adds KIND and MAX_SIZE fields which represent the
> kind of symbol (core kernel, module, ftrace, bpf, or kprobe) and
> the maximum size the symbol can be.  The latter is calculated from
> the difference between current symbol value and the next symbol
> value.
>
> The key benefit for this iterator will likely be supporting in-kernel
> data-gathering rather than dumping symbol details to userspace and
> parsing the results.
>
> Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> Acked-by: Yonghong Song <yhs@...com>
> ---

Please see progs/bpf_iter.h and add ksym iterator types there. Thanks!


>  tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 16 +++++
>  tools/testing/selftests/bpf/progs/bpf_iter_ksym.c | 74 +++++++++++++++++++++++
>  2 files changed, 90 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_ksym.c
>

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