A THP allocation attempt on a non-local NUMA node with MPOL_PREFERRED policy does not work as expected

Issue

• A THP allocation attempt on the preferred node i.e. on a non-local NUMA node is not respected:

$ numactl -p 1 ./thp

Per-node process memory usage (in MBs) for PID 5631 (thp)
                           Node 0          Node 1           Total
                  --------------- --------------- ---------------
Huge                         0.00            0.00            0.00
Heap                         0.00            0.00            0.00
Stack                        0.00            0.01            0.01
Private                  10238.38            2.07        10240.45
----------------  --------------- --------------- ---------------
Total                    10238.38            2.09        10240.46