From: Yonghong Song <yhs@fb.com>
To: Song Liu <songliubraving@fb.com>, <bpf@vger.kernel.org>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <mingo@redhat.com>, <peterz@infradead.org>, <ast@kernel.org>,
<daniel@iogearbox.net>, <andrii@kernel.org>,
<john.fastabend@gmail.com>, <kpsingh@chromium.org>,
<kernel-team@fb.com>, <haoluo@google.com>
Subject: Re: [PATCH bpf-next 2/4] selftests/bpf: add non-BPF_LSM test for task local storage
Date: Mon, 11 Jan 2021 09:30:50 -0800 [thread overview]
Message-ID: <4eac4156-9c81-ff4d-46f5-d45d9d575a16@fb.com> (raw)
In-Reply-To: <20210108231950.3844417-3-songliubraving@fb.com>
On 1/8/21 3:19 PM, Song Liu wrote:
> Task local storage is enabled for tracing programs. Add a test for it
> without CONFIG_BPF_LSM.
>
> Signed-off-by: Song Liu <songliubraving@fb.com>
> ---
> .../bpf/prog_tests/test_task_local_storage.c | 34 +++++++++++++++++
> .../selftests/bpf/progs/task_local_storage.c | 37 +++++++++++++++++++
> 2 files changed, 71 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c
> create mode 100644 tools/testing/selftests/bpf/progs/task_local_storage.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c b/tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c
> new file mode 100644
> index 0000000000000..7de7a154ebbe6
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c
> @@ -0,0 +1,34 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020 Facebook */
2020 -> 2021
> +
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <test_progs.h>
> +#include "task_local_storage.skel.h"
> +
> +static unsigned int duration;
> +
> +void test_test_task_local_storage(void)
> +{
> + struct task_local_storage *skel;
> + const int count = 10;
> + int i, err;
> +
> + skel = task_local_storage__open_and_load();
> +
Extra line is unnecessary here.
> + if (CHECK(!skel, "skel_open_and_load", "skeleton open and load failed\n"))
> + return;
> +
> + err = task_local_storage__attach(skel);
> +
ditto.
> + if (CHECK(err, "skel_attach", "skeleton attach failed\n"))
> + goto out;
> +
> + for (i = 0; i < count; i++)
> + usleep(1000);
Does a smaller usleep value will work? If it is, recommend to have a
smaller value here to reduce test_progs running time.
> + CHECK(skel->bss->value < count, "task_local_storage_value",
> + "task local value too small\n");
> +
> +out:
> + task_local_storage__destroy(skel);
> +}
> diff --git a/tools/testing/selftests/bpf/progs/task_local_storage.c b/tools/testing/selftests/bpf/progs/task_local_storage.c
> new file mode 100644
> index 0000000000000..807255c5c162d
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/task_local_storage.c
> @@ -0,0 +1,37 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020 Facebook */
2020 -> 2021
> +
> +#include "vmlinux.h"
> +#include <bpf/bpf_helpers.h>
> +#include <bpf/bpf_tracing.h>
> +
> +char _license[] SEC("license") = "GPL";
> +
> +struct local_data {
> + __u64 val;
> +};
> +
> +struct {
> + __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
> + __uint(map_flags, BPF_F_NO_PREALLOC);
> + __type(key, int);
> + __type(value, struct local_data);
> +} task_storage_map SEC(".maps");
> +
> +int value = 0;
> +
> +SEC("tp_btf/sched_switch")
> +int BPF_PROG(on_switch, bool preempt, struct task_struct *prev,
> + struct task_struct *next)
> +{
> + struct local_data *storage;
If it possible that we do some filtering based on test_progs pid
so below bpf_task_storage_get is only called for test_progs process?
This is more targeted and can avoid counter contributions from
other unrelated processes and make test_task_local_storage.c result
comparison more meaningful.
> +
> + storage = bpf_task_storage_get(&task_storage_map,
> + next, 0,
> + BPF_LOCAL_STORAGE_GET_F_CREATE);
> + if (storage) {
> + storage->val++;
> + value = storage->val;
> + }
> + return 0;
> +}
>
next prev parent reply other threads:[~2021-01-11 17:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210108231950.3844417-1-songliubraving@fb.com>
[not found] ` <20210108231950.3844417-2-songliubraving@fb.com>
2021-01-11 6:27 ` [PATCH bpf-next 1/4] bpf: enable task local storage for tracing programs Yonghong Song
2021-01-11 10:17 ` KP Singh
2021-01-11 15:56 ` Yonghong Song
2021-01-11 10:14 ` KP Singh
2021-01-11 23:16 ` Song Liu
2021-01-11 17:16 ` Yonghong Song
2021-01-11 18:56 ` Martin KaFai Lau
2021-01-11 21:35 ` KP Singh
2021-01-11 21:58 ` Martin KaFai Lau
2021-01-11 23:45 ` Song Liu
2021-01-12 16:32 ` Yonghong Song
2021-01-12 16:53 ` KP Singh
2021-01-15 23:34 ` Song Liu
2021-01-16 0:55 ` Yonghong Song
2021-01-16 1:12 ` Song Liu
2021-01-16 1:50 ` Yonghong Song
2021-01-11 23:41 ` Song Liu
2021-01-12 18:21 ` Martin KaFai Lau
[not found] ` <20210108231950.3844417-4-songliubraving@fb.com>
2021-01-11 17:37 ` [PATCH bpf-next 3/4] bpf: runqslower: prefer use local vmlinux Yonghong Song
[not found] ` <20210108231950.3844417-5-songliubraving@fb.com>
2021-01-11 17:49 ` [PATCH bpf-next 4/4] bpf: runqslower: use task local storage Yonghong Song
2021-01-11 22:54 ` Song Liu
2021-01-12 3:24 ` Yonghong Song
2021-01-12 7:14 ` Andrii Nakryiko
2021-01-12 7:33 ` Yonghong Song
[not found] ` <20210108231950.3844417-3-songliubraving@fb.com>
2021-01-11 17:30 ` Yonghong Song [this message]
2021-01-11 17:44 ` [PATCH bpf-next 2/4] selftests/bpf: add non-BPF_LSM test for " KP Singh
2021-01-11 22:50 ` Song Liu
2021-01-11 22:49 ` Song Liu
2021-01-12 7:06 ` Andrii Nakryiko
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