linux-kernel - Re: [PATCH 2/2] selftest/bpf: Test returning zero from a perf bpf program suppresses SIGIO.

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Date:   Tue, 5 Dec 2023 12:17:38 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Kyle Huey <me@...ehuey.com>
Cc:     Kyle Huey <khuey@...ehuey.com>, linux-kernel@...r.kernel.org,
        Robert O'Callahan <robert@...llahan.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Shuah Khan <shuah@...nel.org>,
        bpf@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 2/2] selftest/bpf: Test returning zero from a perf bpf
 program suppresses SIGIO.

On Mon, Dec 04, 2023 at 12:14:06PM -0800, Kyle Huey wrote:
> The test sets a hardware breakpoint and uses a bpf program to suppress the
> I/O availability signal if the ip matches the expected value.
> 
> Signed-off-by: Kyle Huey <khuey@...ehuey.com>
> ---
>  .../selftests/bpf/prog_tests/perf_skip.c      | 95 +++++++++++++++++++
>  .../selftests/bpf/progs/test_perf_skip.c      | 23 +++++
>  2 files changed, 118 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/perf_skip.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_perf_skip.c
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/perf_skip.c b/tools/testing/selftests/bpf/prog_tests/perf_skip.c
> new file mode 100644
> index 000000000000..b269a31669b7
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/perf_skip.c
> @@ -0,0 +1,95 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#define _GNU_SOURCE
> +#include <test_progs.h>
> +#include "test_perf_skip.skel.h"
> +#include <linux/hw_breakpoint.h>
> +#include <sys/mman.h>
> +
> +#define BPF_OBJECT            "test_perf_skip.bpf.o"
> +
> +static void handle_sig(int)
> +{
> +	ASSERT_OK(1, "perf event not skipped");
> +}
> +
> +static noinline int test_function(void)
> +{
> +	return 0;
> +}
> +
> +void serial_test_perf_skip(void)

does it need to be serial?

jirka