NUMA not detected on Aarch64 NUMA machine

Ubuntu 16 LTS

# lscpu
Architecture:          aarch64
Byte Order:            Little Endian
CPU(s):                96
On-line CPU(s) list:   0-95
Thread(s) per core:    1
Core(s) per socket:    48
Socket(s):             2
NUMA node(s):          2
L1d cache:             32K
L1i cache:             78K
L2 cache:              16384K
NUMA node0 CPU(s):     0-47
NUMA node1 CPU(s):     48-95

# ./cgraytrace_prof_thread +RTS -s -A40m -qn24 --numa
cgraytrace_prof_thread: --numa: OS reports NUMA is not available
cgraytrace_prof_thread:
cgraytrace_prof_thread: Usage: <prog> <args> [+RTS <rtsopts> | -RTS <args>] ... --RTS <args>
...