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Message-Id: <20240327225334.58474-1-tixxdz@gmail.com>
Date: Wed, 27 Mar 2024 23:53:22 +0100
From: Djalal Harouni <tixxdz@...il.com>
To: tixxdz@...il.com
Cc: Tejun Heo <tj@...nel.org>,
Zefan Li <lizefan.x@...edance.com>,
Johannes Weiner <hannes@...xchg.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Eduard Zingerman <eddyz87@...il.com>,
Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>,
Mykola Lysenko <mykolal@...com>,
Shuah Khan <shuah@...nel.org>,
linux-kernel@...r.kernel.org,
cgroups@...r.kernel.org,
bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: [RFC PATCH bpf-next 0/3] bpf: freeze a task cgroup from bpf
This patch series adds support to freeze the task cgroup hierarchy
that is on a default cgroup v2 without going through kernfs interface.
For some cases we want to freeze the cgroup of a task based on some
signals, doing so from bpf is better than user space which could be
too late.
Planned users of this feature are: tetragon and systemd when freezing
a cgroup hierarchy that could be a K8s pod, container, system service
or a user session.
Patch 1: cgroup: add cgroup_freeze_no_kn() to freeze a cgroup from bpf
Patch 2: bpf: add bpf_task_freeze_cgroup() to freeze the cgroup of a task
Patch 3: selftests/bpf: add selftest for bpf_task_freeze_cgroup
include/linux/cgroup.h | 2 ++
kernel/bpf/helpers.c | 31 ++++
kernel/cgroup/cgroup.c | 67 ++++++++
tools/testing/selftests/bpf/prog_tests/task_freeze_cgroup.c | 165 +++++++++++++++++++++
tools/testing/selftests/bpf/progs/test_task_freeze_cgroup.c | 110 ++++++++++++++
5 files changed, 375 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/task_freeze_cgroup.c
create mode 100644 tools/testing/selftests/bpf/progs/test_task_freeze_cgroup.c
--
2.34.1
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