$ cat /proc/meminfo
MemTotal: 2052440 kB //总内存
MemFree: 50004 kB //空闲内存
Buffers: 19976 kB //给文件的缓冲大小
Cached: 436412 kB //高速缓冲存储器(/view/496990.htm)使用的大小
SwapCached: 19864 kB //被高速缓冲存储用的交换空间大小
Active: 1144512 kB //活跃使用中的高速缓冲存储器页面文件大小
Inactive: 732788 kB //不经常使用的高速缓冲存储器页面文件大小
Active(anon): 987640 kB //anon：不久
Inactive(anon): 572512 kB
Active(file): 156872 kB
Inactive(file): 160276 kB
Unevictable: 8 kB
Mlocked: 8 kB
HighTotal: 1177160 kB //The total and free amount of memory, in kilobytes, that is not directly mapped into kernel space.
HighFree: 7396 kB // The HighTotal value can vary based on the type of kernel used.
LowTotal: 875280 kB // The total and free amount of memory, in kilobytes, that is directly mapped into kernel space. used.
LowFree: 42608 kB //The LowTotal value can vary based on the type of kernel
SwapTotal: 489940 kB //交换空间总大小
SwapFree: 450328 kB //空闲交换空间
Dirty: 104 kB //等待被写回到磁盘的大小
Writeback: 0 kB //正在被写回的大小
AnonPages: 1408256 kB //未映射的页的大小
Mapped: 131964 kB //设备和文件映射的大小
Slab: 37368 kB //内核数据结构缓存的大小，可减少申请和释放内存带来的消耗
SReclaimable: 14164 kB //可收回slab的大小
SUnreclaim: 23204 kB //不可收回的slab的大小23204+14164=37368
PageTables: 13308 kB //管理内存分页的索引表的大小
NFS_Unstable: 0 kB //不稳定页表的大小
Bounce: 0 kB //bounce:退回
WritebackTmp: 0 kB //
CommitLimit: 1516160 kB
Committed_AS: 2511900 kB
VmallocTotal: 122880 kB //虚拟内存大小
VmallocUsed: 28688 kB //已经被使用的虚拟内存大小
VmallocChunk: 92204 kB
HugePages_Total: 0 //大页面的分配
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 10232 kB
DirectMap2M: 899072 kB
