./"lock"n .,1$<<lock ./n"header"n .$<<map_entry ./n"nentries"16t"pmap"16t"size"16t"is_main_map"nDXXD +/"ref_count"16t"ref_lock"16t"hint"16t"hint_lock"nD3X +/"first_free"16t"ent_pageable"16t"timestamp"nXDX