I find the count nr_file_pages is not equal to nr_inactive_file + nr_active_file. There are 8 cpus, 2 zones in my system. I think may be the pagevec trigger the problem, but PAGEVEC_SIZE is only 14. Does anyone know the reason? Thanks, Xishi Qiu root@hi3650:/ # cat /proc/vmstat nr_free_pages 54192 nr_inactive_anon 39830 nr_active_anon 28794 nr_inactive_file 432444 nr_active_file 20659 nr_unevictable 2363 nr_mlock 0 nr_anon_pages 65249 nr_mapped 19742 nr_file_pages 462723 nr_dirty 20 nr_writeback 0 ... nr_inactive_file 432444 nr_active_file 20659 total is 453103 nr_file_pages 462723 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>