Re: [PATCH bpf-next v1 0/6] mm: bpf kfuncs to access memcg data

[Roman Gushchin <roman.gushchin@linux.dev>]

Roman Gushchin <roman.gushchin@linux.dev> writes:

I believe it can go through the bpf tree or the mm tree.

I'd slightly prefer the mm tree, simple because follow up bpf oom
patches have more changes on the mm side.

If Alexei, Daniel and Andrii is fine with it, Andrew, can you, please,
pick them up?

(bpf oom patches will follow likely next week)

Thank you!

> Introduce kfuncs to simplify the access to the memcg data.
> These kfuncs can be used to accelerate monitoring use cases and
> for implementing custom OOM policies once BPF OOM is landed.
>
> This patchset was separated out from the BPF OOM patchset to simplify
> the logistics and accelerate the landing of the part which is useful
> by itself. No functional changes since BPF OOM v2.
>
>
> JP Kobryn (2):
>   mm: introduce BPF kfunc to access memory events
>   bpf: selftests: selftests for memcg stat kfuncs
>
> Roman Gushchin (4):
>   mm: declare memcg_page_state_output() in memcontrol.h
>   mm: introduce BPF kfuncs to deal with memcg pointers
>   mm: introduce bpf_get_root_mem_cgroup() BPF kfunc
>   mm: introduce BPF kfuncs to access memcg statistics and events
>
>  include/linux/memcontrol.h                    |   3 +
>  mm/Makefile                                   |   3 +
>  mm/bpf_memcontrol.c                           | 175 ++++++++++++++
>  mm/memcontrol-v1.h                            |   1 -
>  .../testing/selftests/bpf/cgroup_iter_memcg.h |  18 ++
>  .../bpf/prog_tests/cgroup_iter_memcg.c        | 223 ++++++++++++++++++
>  .../selftests/bpf/progs/cgroup_iter_memcg.c   |  42 ++++
>  7 files changed, 464 insertions(+), 1 deletion(-)
>  create mode 100644 mm/bpf_memcontrol.c
>  create mode 100644 tools/testing/selftests/bpf/cgroup_iter_memcg.h
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/cgroup_iter_memcg.c
>  create mode 100644 tools/testing/selftests/bpf/progs/cgroup_iter_memcg.c