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(-) -- 2.25.1
