map_backmerge     100 uvm/uvm_map.c  struct uvm_cnt uvm_map_call, map_backmerge, map_forwmerge;
map_backmerge     538 uvm/uvm_map.c  	UVMCNT_INIT(map_backmerge, UVMCNT_CNT, 0, "# uvm_map() back merges", 0);
map_backmerge     843 uvm/uvm_map.c  		UVMCNT_INCR(map_backmerge);