On 2016/5/16 17:31, Michal Hocko wrote: > On Fri 13-05-16 11:58:16, Xishi Qiu wrote: >> 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. > > Because they count shmem pages as well and those are living on the anon > lru list (see shmem_add_to_page_cache). Hi Michal, But the shmem seems very small. nr_inactive_file 432444 nr_active_file 20659 nr_unevictable 2363 nr_shmem 128 nr_file_pages 462723 There is still 7129 pages difference. 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_slab_reclaimable 259333 nr_slab_unreclaimable 33463 nr_page_table_pages 3456 nr_kernel_stack 892 nr_unstable 0 nr_bounce 11 nr_vmscan_write 292032 nr_vmscan_immediate_reclaim 47204474 nr_writeback_temp 0 nr_isolated_anon 0 nr_isolated_file 0 nr_shmem 128 nr_dirtied 69574 nr_written 356299 nr_anon_transparent_hugepages 0 nr_free_cma 7519 nr_swapcache 41972 nr_dirty_threshold 6982 nr_dirty_background_threshold 99297 -- 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>