PAGE_COUNTERS_BASE
oldbase = PAGE_COUNTERS_BASE(oldmnode, r);
PAGE_COUNTERS_BASE(mnode, r) = newbase;
PAGE_COUNTERS_BASE(i, r) = newbase;
(((pnum) - PAGE_COUNTERS_BASE((mnode), (rg_szc))) >> \
(PAGE_COUNTERS_BASE((mnode), (rg_szc)) + \
PAGE_COUNTERS_BASE(mnode, r) = r_base;