linux-kernel - [PATCH bpf-next 0/4] Support storing struct cgroup * objects as kptrs

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Date:   Mon, 21 Nov 2022 23:54:54 -0600
From:   David Vernet <void@...ifault.com>
To:     bpf@...r.kernel.org
Cc:     ast@...nel.org, andrii@...nel.org, daniel@...earbox.net,
        martin.lau@...ux.dev, yhs@...com, song@...nel.org, sdf@...gle.com,
        john.fastabend@...il.com, kpsingh@...nel.org, jolsa@...nel.org,
        haoluo@...gle.com, tj@...nel.org, kernel-team@...com,
        linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next 0/4] Support storing struct cgroup * objects as kptrs

In [0], we added support for storing struct task_struct * objects as
kptrs. This patch set extends this effort to also include storing struct
cgroup * object as kptrs.

As with tasks, there are many possible use cases for storing cgroups in
maps. During tracing, for example, it could be useful to query cgroup
statistics such as PSI averages, or tracking which tasks are migrating
to and from the cgroup.

[0]: https://lore.kernel.org/all/20221120051004.3605026-1-void@manifault.com/

David Vernet (4):
  bpf: Enable cgroups to be used as kptrs
  selftests/bpf: Add cgroup kfunc / kptr selftests
  bpf: Add bpf_cgroup_ancestor() kfunc
  selftests/bpf: Add selftests for bpf_cgroup_ancestor() kfunc

 kernel/bpf/helpers.c                          | 103 ++++++-
 tools/testing/selftests/bpf/DENYLIST.s390x    |   1 +
 .../selftests/bpf/prog_tests/cgrp_kfunc.c     | 175 ++++++++++++
 .../selftests/bpf/progs/cgrp_kfunc_common.h   |  72 +++++
 .../selftests/bpf/progs/cgrp_kfunc_failure.c  | 260 ++++++++++++++++++
 .../selftests/bpf/progs/cgrp_kfunc_success.c  | 170 ++++++++++++
 6 files changed, 778 insertions(+), 3 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c
 create mode 100644 tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h
 create mode 100644 tools/testing/selftests/bpf/progs/cgrp_kfunc_failure.c
 create mode 100644 tools/testing/selftests/bpf/progs/cgrp_kfunc_success.c

-- 
2.38.1