[PATCH bpf-next v4 0/2] Introduce a new kfunc of bpf_task_under_cgroup

[Feng zhou]

From: Feng Zhou <zhoufeng.zf@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx/

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@xxxxxxxxxxxxx/

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

 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

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2.20.1