proc/meminfo详解

[root@iZ2ze7ukvpkonzby0h3wbfZ ~]# cat /proc/meminfo 
MemTotal:       16265476 kB    //可用的总内存
MemFree:          212936 kB    //完全未用到的物理内存 LowFree+HighFree
MemAvailable:    1968228 kB    //MemAvailable ≈ MemFree+Buffers+Cached
Buffers:          295584 kB    //缓冲区内存数
Cached:          1494920 kB    //缓存区内存数
SwapCached:            0 kB
Active:         14561076 kB
Inactive:         579924 kB
Active(anon):   13351228 kB
Inactive(anon):      508 kB
Active(file):    1209848 kB
Inactive(file):   579416 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB    //可用的swap空间的总的大小
SwapFree:              0 kB    //剩余swap空间的大小
Dirty:               384 kB    //需要写入磁盘的内存区大小
Writeback:             0 kB    //正在被写回磁盘的大小
AnonPages:      13350500 kB    //未映射页的内存大小
Mapped:           120580 kB    //设备和文件等映射的大小
Shmem:              1240 kB
Slab:             437004 kB
SReclaimable:     304268 kB
SUnreclaim:       132736 kB
KernelStack:       78080 kB
PageTables:        53668 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     8132736 kB
Committed_AS:   17893748 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      137012 kB
VmallocChunk:   34359496008 kB
Percpu:             2496 kB
HardwareCorrupted:     0 kB
AnonHugePages:   2336768 kB
CmaTotal:              0 kB
CmaFree:               0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      300856 kB
DirectMap2M:    16476160 kB
DirectMap1G:     2097152 kB