dm_kvzalloc
s = dm_kvzalloc(shared_alloc_size, NUMA_NO_NODE);
hi = dm_kvzalloc(s->histogram_alloc_size, NUMA_NO_NODE);
p = dm_kvzalloc(percpu_alloc_size, cpu_to_node(cpu));
hi = dm_kvzalloc(s->histogram_alloc_size, cpu_to_node(cpu));