On Mon, May 9, 2022 at 5:18 PM Yosry Ahmed <yosryahmed@xxxxxxxxxx> wrote: > > From: Hao Luo <haoluo@xxxxxxxxxx> > > Introduce a new type of iter prog: cgroup. Unlike other bpf_iter, this > iter doesn't iterate a set of kernel objects. Instead, it is supposed to > be parameterized by a cgroup id and prints only that cgroup. So one > needs to specify a target cgroup id when attaching this iter. The target > cgroup's state can be read out via a link of this iter. > > Signed-off-by: Hao Luo <haoluo@xxxxxxxxxx> > Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx> > --- > include/linux/bpf.h | 2 + > include/uapi/linux/bpf.h | 6 ++ > kernel/bpf/Makefile | 2 +- > kernel/bpf/cgroup_iter.c | 148 +++++++++++++++++++++++++++++++++ > tools/include/uapi/linux/bpf.h | 6 ++ > 5 files changed, 163 insertions(+), 1 deletion(-) > create mode 100644 kernel/bpf/cgroup_iter.c > Thanks Yosry for posting this patch! Dear reviewers, this is v2 of the cgroup_iter change I sent previously at https://lore.kernel.org/bpf/20220225234339.2386398-9-haoluo@xxxxxxxxxx/ v1 - > v2: - Getting the cgroup's reference at the time at attaching, instead of at the time when iterating. (Yonghong) (context [1]) - Remove .init_seq_private and .fini_seq_private callbacks for cgroup_iter. They are not needed now. (Yonghong) [1] https://lore.kernel.org/bpf/f780fc3a-dbc2-986c-d5a0-6b0ef1c4311f@xxxxxx/ Hao
