NR_ZONE_ACTIVE_FILE
nr_pages += zone_page_state(z, NR_ZONE_ACTIVE_FILE);
K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE)),
zone_page_state_snapshot(zone, NR_ZONE_ACTIVE_FILE);
[I(NR_ZONE_ACTIVE_FILE)] = "nr_zone_active_file",