Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Feng zhou <zhoufeng.zf@bytedance.com>
To:     martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net,
        andrii@kernel.org, song@kernel.org, yhs@fb.com,
        john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
        haoluo@google.com, jolsa@kernel.org, davem@davemloft.net,
        edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
        mykolal@fb.com, shuah@kernel.org
Cc:     bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, linux-kselftest@vger.kernel.org,
        yangzhenze@bytedance.com, wangdongdong.6@bytedance.com,
        zhoufeng.zf@bytedance.com
Subject: [PATCH bpf-next v4 0/2] Introduce a new kfunc of bpf_task_under_cgroup
Date:   Fri, 28 Apr 2023 15:17:35 +0800
Message-Id: <20230428071737.43849-1-zhoufeng.zf@bytedance.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Feng Zhou <zhoufeng.zf@bytedance.com>

Trace sched related functions, such as enqueue_task_fair, it is necessary to
specify a task instead of the current task which within a given cgroup.

Feng Zhou (2):
  bpf: Add bpf_task_under_cgroup() kfunc
  selftests/bpf: Add testcase for bpf_task_under_cgroup

Changelog:
v3->v4: Addressed comments from Yonghong Song
- Modify test cases and test other tasks, not the current task.
Details in here:
https://lore.kernel.org/all/20230427023019.73576-1-zhoufeng.zf@bytedance.com/

v2->v3: Addressed comments from Alexei Starovoitov
- Modify the comment information of the function.
- Narrow down the testcase's hook point
Details in here:
https://lore.kernel.org/all/20230421090403.15515-1-zhoufeng.zf@bytedance.com/

v1->v2: Addressed comments from Alexei Starovoitov
- Add kfunc instead.
Details in here:
https://lore.kernel.org/all/20230420072657.80324-1-zhoufeng.zf@bytedance.com/

 kernel/bpf/helpers.c                          | 20 +++++++
 tools/testing/selftests/bpf/DENYLIST.s390x    |  1 +
 .../bpf/prog_tests/task_under_cgroup.c        | 55 +++++++++++++++++++
 .../bpf/progs/test_task_under_cgroup.c        | 51 +++++++++++++++++
 4 files changed, 127 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/task_under_cgroup.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_task_under_cgroup.c

-- 
2.20.1