~$ cat /proc/meminfo 
MemTotal:        8103684 kB
MemFree:         3977252 kB
MemAvailable:    5742932 kB
Buffers:          187988 kB
Cached:          1795228 kB
SwapCached:            0 kB
Active:           903428 kB
Inactive:        2764156 kB
Active(anon):       4140 kB
Inactive(anon):  1749780 kB
Active(file):     899288 kB
Inactive(file):  1014376 kB
Unevictable:          80 kB
Mlocked:              80 kB
SwapTotal:      20390904 kB
SwapFree:       20390904 kB
Dirty:               236 kB
Writeback:             0 kB
AnonPages:       1678280 kB
Mapped:           438944 kB
Shmem:             69552 kB
KReclaimable:     144360 kB
Slab:             230520 kB
SReclaimable:     144360 kB
SUnreclaim:        86160 kB
KernelStack:       15920 kB
PageTables:        26516 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    24442744 kB
Committed_AS:    6057032 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       84416 kB
VmallocChunk:          0 kB
Percpu:             7328 kB
HardwareCorrupted:     0 kB
AnonHugePages:    575488 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
FileHugePages:         0 kB
FilePmdMapped:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
DirectMap4k:      294400 kB
DirectMap2M:     8052736 kB

$ free
               total        used        free      shared  buff/cache   available
Mem:         8103684     1997356     3978708       69552     2127620     5744432
Swap:       20390904           0    20390904

vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 3976880 188088 1940656    0    0    16    23   33   77  1  1 98  0  0