linux-kernel - Re: [PATCH bpf-next 4/5] selftests/bpf: move two functions to test

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Date:   Sun, 2 Aug 2020 18:46:37 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Xu <dlxu@...com>
Subject: Re: [PATCH bpf-next 4/5] selftests/bpf: move two functions to test_progs.c

On Sat, Aug 1, 2020 at 1:50 AM Song Liu <songliubraving@...com> wrote:
>
> Move time_get_ns() and get_base_addr() to test_progs.c, so they can be
> used in other tests.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  .../selftests/bpf/prog_tests/attach_probe.c   | 21 -------------
>  .../selftests/bpf/prog_tests/test_overhead.c  |  8 -----
>  tools/testing/selftests/bpf/test_progs.c      | 30 +++++++++++++++++++
>  tools/testing/selftests/bpf/test_progs.h      |  2 ++
>  4 files changed, 32 insertions(+), 29 deletions(-)
>

[...]

>  static int test_task_rename(const char *prog)
>  {
>         int i, fd, duration = 0, err;
> diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
> index b1e4dadacd9b4..c9e6a5ad5b9a4 100644
> --- a/tools/testing/selftests/bpf/test_progs.c
> +++ b/tools/testing/selftests/bpf/test_progs.c
> @@ -622,6 +622,36 @@ int cd_flavor_subdir(const char *exec_name)
>         return chdir(flavor);
>  }
>
> +__u64 time_get_ns(void)
> +{

I'd try to avoid adding stuff to test_progs.c. There is generic
testing_helpers.c, maybe let's put this there?

> +       struct timespec ts;
> +
> +       clock_gettime(CLOCK_MONOTONIC, &ts);
> +       return ts.tv_sec * 1000000000ull + ts.tv_nsec;
> +}
> +
> +ssize_t get_base_addr(void)
> +{

This would definitely be better in trace_helpers.c, though.

> +       size_t start, offset;
> +       char buf[256];
> +       FILE *f;
> +

[...]