mod_zone_state    521 mm/vmstat.c    	mod_zone_state(zone, item, delta, 0);
mod_zone_state    527 mm/vmstat.c    	mod_zone_state(page_zone(page), item, 1, 1);
mod_zone_state    533 mm/vmstat.c    	mod_zone_state(page_zone(page), item, -1, -1);