PAGE_COUNTERS_SHIFT
PAGE_COUNTERS_SHIFT(mnode, r) = PAGE_BSZS_SHIFT(r);
old_npgs = old_csz << PAGE_COUNTERS_SHIFT(oldmnode, r);
pcsz = npgs >> PAGE_COUNTERS_SHIFT(mnode, r);
PAGE_COUNTERS_SHIFT(mnode, r);
PAGE_COUNTERS_SHIFT(mnode, r);
PAGE_COUNTERS_SHIFT((mnode), (rg_szc)))
((index) << PAGE_COUNTERS_SHIFT((mnode), (rg_szc))))
PAGE_COUNTERS_SHIFT(mnode, r) = r_shift;