linux-kernel - Re: [PATCHv2 bpf-next 8/9] selftests/bpf: Add uprobe session recursive test

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Date: Tue, 2 Jul 2024 15:01:35 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Oleg Nesterov <oleg@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org, Martin KaFai Lau <kafai@...com>, 
	Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, 
	John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...omium.org>, 
	Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Steven Rostedt <rostedt@...dmis.org>, 
	Masami Hiramatsu <mhiramat@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCHv2 bpf-next 8/9] selftests/bpf: Add uprobe session
 recursive test

On Mon, Jul 1, 2024 at 9:43 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding uprobe session test that verifies the cookie value is stored
> properly when single uprobe-ed function is executed recursively.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  .../bpf/prog_tests/uprobe_multi_test.c        | 57 +++++++++++++++++++
>  .../progs/uprobe_multi_session_recursive.c    | 44 ++++++++++++++
>  2 files changed, 101 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c
>

Nice!

Acked-by: Andrii Nakryiko <andrii@...nel.org>


[...]

> +static void test_session_recursive_skel_api(void)
> +{
> +       struct uprobe_multi_session_recursive *skel = NULL;
> +       int i, err;
> +
> +       skel = uprobe_multi_session_recursive__open_and_load();
> +       if (!ASSERT_OK_PTR(skel, "uprobe_multi_session_recursive__open_and_load"))
> +               goto cleanup;
> +
> +       skel->bss->pid = getpid();
> +
> +       err = uprobe_multi_session_recursive__attach(skel);
> +       if (!ASSERT_OK(err, "uprobe_multi_session_recursive__attach"))
> +               goto cleanup;
> +
> +       for (i = 0; i < ARRAY_SIZE(skel->bss->test_uprobe_cookie_entry); i++)
> +               skel->bss->test_uprobe_cookie_entry[i] = i + 1;
> +
> +       uprobe_session_recursive(5);
> +
> +       /*

nit: unnecessary empty comment line

> +        *                                         entry uprobe:
> +        * uprobe_session_recursive(5) {             *cookie = 1, return 0
> +        *   uprobe_session_recursive(4) {           *cookie = 2, return 1
> +        *     uprobe_session_recursive(3) {         *cookie = 3, return 0
> +        *       uprobe_session_recursive(2) {       *cookie = 4, return 1
> +        *         uprobe_session_recursive(1) {     *cookie = 5, return 0
> +        *           uprobe_session_recursive(0) {   *cookie = 6, return 1
> +        *                                          return uprobe:
> +        *           } i = 0                          not executed
> +        *         } i = 1                            test_uprobe_cookie_return[0] = 5
> +        *       } i = 2                              not executed
> +        *     } i = 3                                test_uprobe_cookie_return[1] = 3
> +        *   } i = 4                                  not executed
> +        * } i = 5                                    test_uprobe_cookie_return[2] = 1
> +        */
> +

[...]