netdev - Re: selftests/bpf :get_cgroup_id_user: File not found: /sys/kernel/debug/tracing/events/syscalls/sys_enter

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Message-ID: <CAH3MdRVOFSQYYYNL_43o5DuXuShqQWhVutzQ5rpytenhObPWxQ@mail.gmail.com>
Date:   Wed, 21 Nov 2018 09:53:47 -0800
From:   Y Song <ys114321@...il.com>
To:     naresh.kamboju@...aro.org
Cc:     linux-kselftest@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        Yonghong Song <yhs@...com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: selftests/bpf :get_cgroup_id_user: File not found: /sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id

On Wed, Nov 21, 2018 at 3:44 AM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> Kselftest bpf get_cgroup_id_user is failed on all devices.
>
> selftests: bpf: get_cgroup_id_user
> main:PASS:setup_cgroup_environment
> main:PASS:create_and_get_cgroup
> main:PASS:join_cgroup
> main:PASS:bpf_prog_load
> main:PASS:bpf_find_map
> main:PASS:bpf_find_map
> main:FAIL:open err -1 errno 2
> not ok 1..15 selftests: bpf: get_cgroup_id_user [FAIL]
>
> The strace output shows,
> This expected file not found,
> "/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id"
>
> bpf(BPF_MAP_UPDATE_ELEM, {map_fd=5, key=0x7fff0c68c138,
> value=0x7fff0c68c13c, flags=BPF_ANY}, 72) = 0
> open(\"/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id\",
> O_RDONLY) = -1 ENOENT (No such file or directory)
> write(1, \"main:FAIL:open err -1 errno 2\n\", 30main:FAIL:open err -1 errno 2
>
> Am I missing any pre-requirement ?

You probably miss kernel config CONFIG_FTRACE_SYSCALLS.

>
> Best regards
> Naresh Kamboju