[RFC PATCH 0/3] sched/numa: Introduce per cgroup numa balance control

[Chen Yu]

Introduce a per-cgroup interface to enable NUMA balancing
for specific cgroups. The system administrator needs to set
the NUMA balancing mode to NUMA_BALANCING_CGROUP=4 to enable
this feature. When in the NUMA_BALANCING_CGROUP mode, all
cgroups' NUMA balancing is disabled by default. After the
administrator enables this feature for a specific cgroup,
NUMA balancing for that cgroup is enabled.

This per-cgroup NUMA balancing control was once proposed in
2019 by Yun Wang[1]. Then, in 2024, Kaiyang Zhao mentioned
that he was working with Meta on per-cgroup NUMA control[2]
during a discussion with David Rientjes.

I could not find further discussion regarding per-cgroup NUMA
balancing from that point on. This set of RFC patches is a
rough and compile-passed version, and may have unhandled cases
(for example, THP). It has not been thoroughly tested and is
intended to initiate or resume the discussion on the topic of
per-cgroup NUMA load balancing.

The first patch is a NUMA load balancing statistics enhancement.
The second patch introduces per-cgroup NUMA balancing. The third
one enhances NUMA load balancing for the MPOL_INTERLEAVE policy.

Any feedback would be appreciated.

[1] https://lore.kernel.org/linux-fsdevel/60b59306-5e36-e587-9145-e90657daec41@xxxxxxxxxxxxxxxxx/
[2] https://lore.kernel.org/linux-mm/ZrukILyQhMAKWwTe@localhost.localhost/T/

Chen Yu (3):
  sched/numa: Introduce numa balance task migration and swap in
    schedstats
  sched/numa: Introduce per cgroup numa balance control
  sched/numa: Allow intervale memory allocation for numa balance

 include/linux/numa.h           |  1 +
 include/linux/sched.h          |  4 ++++
 include/linux/sched/sysctl.h   |  1 +
 include/linux/vm_event_item.h  |  2 ++
 include/uapi/linux/mempolicy.h |  1 +
 kernel/sched/core.c            | 42 ++++++++++++++++++++++++++++++++--
 kernel/sched/debug.c           |  4 ++++
 kernel/sched/fair.c            | 18 +++++++++++++++
 kernel/sched/sched.h           |  3 +++
 mm/memcontrol.c                |  2 ++
 mm/memory.c                    |  2 +-
 mm/mempolicy.c                 |  7 ++++++
 mm/mprotect.c                  |  5 ++--
 mm/vmstat.c                    |  2 ++
 14 files changed, 89 insertions(+), 5 deletions(-)

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2.25.1