vm_pagequeue_cnt_add
vm_pagequeue_cnt_add(pq, delta);
vm_pagequeue_cnt_add(pq, -ss->bq.bq_cnt);
#define vm_pagequeue_cnt_inc(pq) vm_pagequeue_cnt_add((pq), 1)
#define vm_pagequeue_cnt_dec(pq) vm_pagequeue_cnt_add((pq), -1)