On Mon 04-05-20 12:33:04, Sandipan Das wrote: > For unpopulated zones, the pagesets point to the common > boot_pageset which can have non-zero vm_numa_stat counts. > Because of this memory-less nodes end up having non-zero > NUMA statistics. This can be observed on any architecture > that supports memory-less NUMA nodes. > > E.g. > > $ numactl -H > available: 2 nodes (0-1) > node 0 cpus: 0 1 2 3 > node 0 size: 0 MB > node 0 free: 0 MB > node 1 cpus: 4 5 6 7 > node 1 size: 8131 MB > node 1 free: 6980 MB > node distances: > node 0 1 > 0: 10 40 > 1: 40 10 > > $ numastat > node0 node1 > numa_hit 108 56495 > numa_miss 0 0 > numa_foreign 0 0 > interleave_hit 0 4537 > local_node 108 31547 > other_node 0 24948 > > Hence, return zero explicitly for all the stats of an > unpopulated zone. I hope I am not just confused but I would expect that at least numa_foreign and other_node to be non zero. -- Michal Hocko SUSE Labs
