lgrp_mem_choose
lgrp_t *lgrp_mem_choose(struct seg *, caddr_t, size_t);
lgrp = lgrp_mem_choose(seg, addr, pgsz);
lgrp = lgrp_mem_choose(seg, vaddr, PAGESIZE);
lgrp = lgrp_mem_choose(seg, addr, pgsz);
lgrp = lgrp_mem_choose(seg, vaddr, bytes);
lgrp = lgrp_mem_choose(seg, vaddr, PAGESIZE);
to = lgrp_mem_choose(seg, addr, pgsz);