netdev - [PATCH bpf-next v5 0/2] Introduce a new kfunc of bpf_task_under

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Date: Thu,  4 May 2023 11:15:10 +0800
From: Feng zhou <zhoufeng.zf@...edance.com>
To: martin.lau@...ux.dev,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	song@...nel.org,
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Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
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	zhoufeng.zf@...edance.com
Subject: [PATCH bpf-next v5 0/2] Introduce a new kfunc of bpf_task_under_cgroup

From: Feng Zhou <zhoufeng.zf@...edance.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:
v4->v5: Addressed comments from Yonghong Song
- Some code format modifications.
Details in here:
https://lore.kernel.org/all/20230428071737.43849-1-zhoufeng.zf@bytedance.com/

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        | 54 +++++++++++++++++++
 .../bpf/progs/test_task_under_cgroup.c        | 51 ++++++++++++++++++
 4 files changed, 126 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