netdev - Re: [PATCH v4 bpf-next 8/9] selftests/bpf: add trace

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Date:   Thu, 2 Sep 2021 16:13:13 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Dave Marchevsky <davemarchevsky@...com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Yonghong Song <yhs@...com>, Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 bpf-next 8/9] selftests/bpf: add trace_vprintk test prog

On Thu, Sep 2, 2021 at 10:23 AM Dave Marchevsky <davemarchevsky@...com> wrote:
>
> This commit adds a test prog for vprintk which confirms that:
>   * bpf_trace_vprintk is writing to dmesg

But it doesn't write to dmesg, does it? It's writing to
/sys/kernel/debug/tracing/trace_pipe, which is a different thing
entirely, right?

>   * __bpf_vprintk macro works as expected
>   * >3 args are printed
>
> Approach and code are borrowed from trace_printk test.
>
> Signed-off-by: Dave Marchevsky <davemarchevsky@...com>
> Acked-by: Andrii Nakryiko <andrii@...nel.org>
> ---
>  tools/testing/selftests/bpf/Makefile          |  3 +-
>  .../selftests/bpf/prog_tests/trace_vprintk.c  | 65 +++++++++++++++++++
>  .../selftests/bpf/progs/trace_vprintk.c       | 25 +++++++
>  3 files changed, 92 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/trace_vprintk.c
>  create mode 100644 tools/testing/selftests/bpf/progs/trace_vprintk.c
>

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