Uso real de la memoria RAM.

free -m
             total       used       free     shared    buffers     cached
Mem:           128         67         60          0          0         58
-/+ buffers/cache:          8        119
Swap:          128          0        128

cat /proc/meminfo 
MemTotal:         131072 kB
MemFree:           44184 kB
Cached:            77764 kB
Buffers:               0 kB
Active:            70960 kB
Inactive:           7152 kB
Active(anon):      34904 kB
Inactive(anon):     4940 kB
Active(file):      36056 kB
Inactive(file):     2212 kB
Unevictable:        1928 kB
Mlocked:            1948 kB
SwapTotal:        131072 kB
SwapFree:         131072 kB
Dirty:               176 kB
Writeback:             0 kB
AnonPages:         39844 kB
Shmem:             39496 kB
Slab:               6832 kB
SReclaimable:       3816 kB
SUnreclaim:         3016 kB

Falsear los datos de la memoria RAM

vim /etc/fake_meminfo 
 
MemTotal:        1310720 kB
MemFree:          985964 kB
Cached:            32892 kB
Buffers:               0 kB
Active:            35268 kB
Inactive:           3348 kB
Active(anon):      24612 kB
Inactive(anon):      136 kB
Active(file):      10656 kB
Inactive(file):     3212 kB
Unevictable:        1928 kB
Mlocked:            1948 kB
SwapTotal:       5131072 kB
SwapFree:        4931072 kB
Dirty:               496 kB
Writeback:             0 kB
AnonPages:         24748 kB
Shmem:             19024 kB
Slab:               4552 kB
SReclaimable:       1760 kB
SUnreclaim:         2792 kB

umount /proc/meminfo 2> /dev/null 
mount --bind /etc/fake_meminfo /proc/meminfo

Comprobación de los nuevos valores de uso de la memoria RAM.

free 
             total       used       free     shared    buffers     cached
Mem:       1310720     324756     985964          0          0      32892
-/+ buffers/cache:     291864    1018856
Swap:      5131072     200000    4931072