/proc/meminfo

 cat /proc/meminfo
MemTotal:        8181572 kB
MemFree:          357876 kB
Buffers:          451476 kB
Cached:          2977340 kB
SwapCached:        25564 kB
Active:          2460468 kB
Inactive:        2811080 kB
Active(anon):    1218700 kB
Inactive(anon):   636852 kB
Active(file):    1241768 kB
Inactive(file):  2174228 kB
Unevictable:       38464 kB
Mlocked:           36308 kB
SwapTotal:       2000088 kB
SwapFree:        1801912 kB
Dirty:               248 kB
Writeback:             0 kB
AnonPages:       1856732 kB
Mapped:           163012 kB
Shmem:              3412 kB
Slab:             339968 kB
SReclaimable:     305188 kB
SUnreclaim:        34780 kB
KernelStack:        4736 kB
PageTables:        49992 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     6090872 kB
Committed_AS:    5811440 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      190564 kB
VmallocChunk:   34359541756 kB
HardwareCorrupted:     0 kB
AnonHugePages:    821248 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      254848 kB
DirectMap2M:     8132608 kB