1. [root@dce-10-29-0-255 ~]# cat /proc/meminfo |egrep -i 'buffers|cached|active\(file\)|shmem'
    2. Buffers: 2744 kB
    3. Cached: 9566148 kB
    4. SwapCached: 0 kB
    5. Active(file): 2590724 kB
    6. Inactive(file): 6381380 kB
    7. Shmem: 596788 kB
    8. [root@dce-10-29-0-255 ~]# expr 2744 + 9566148
    9. 9568892
    10. [root@dce-10-29-0-255 ~]# expr 2590724 + 6381380 + 596788
    11. 9568892
    12. [root@dce-10-29-0-255 ~]# echo "Buffers + Cached = Active(file) + Inactive(file) + Shmem"
    13. Buffers + Cached = Active(file) + Inactive(file) + Shmem
    14. [root@dce-10-29-0-255 ~]# free && cat /proc/meminfo |grep -i 'buffers\|cached\|Sreclaimable'
    15. total used free shared buff/cache available
    16. Mem: 16247596 5559068 544208 596744 10144320 9753596
    17. Swap: 0 0 0
    18. Buffers: 2744 kB
    19. Cached: 9578952 kB
    20. SwapCached: 0 kB
    21. SReclaimable: 562624 kB
    22. [root@dce-10-29-0-255 ~]# expr 2744 + 9578952 + 562624
    23. 10144320
    24. [root@dce-10-29-0-255 ~]# buff/cache = Buffers + Cached + SReclaimable:
    25. SReclaimable 是指可被回收的内核内存。