查看系统整个内存使用信息/proc/meminfo

# cat /proc/meminfo
MemTotal:          60892 kB
MemFree:           52304 kB
Buffers:               0 kB
Cached:             5360 kB
SwapCached:            0 kB
Active:             1652 kB
Inactive:           4104 kB
Active(anon):        396 kB
Inactive(anon):        0 kB
Active(file):       1256 kB
Inactive(file):     4104 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:           424 kB
Mapped:              756 kB
Slab:               1868 kB
SReclaimable:        976 kB
SUnreclaim:          892 kB
PageTables:           72 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:       30444 kB
Committed_AS:       1092 kB
VmallocTotal:     917504 kB
VmallocUsed:       33192 kB
VmallocChunk:     876540 kB
# cd -
/proc
# cat /proc/meminfo
MemTotal:          60892 kB
MemFree:           52304 kB
Buffers:               0 kB
Cached:             5360 kB
SwapCached:            0 kB
Active:             1652 kB
Inactive:           4104 kB
Active(anon):        396 kB
Inactive(anon):        0 kB
Active(file):       1256 kB
Inactive(file):     4104 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:           424 kB
Mapped:              756 kB
Slab:               1872 kB
SReclaimable:        976 kB
SUnreclaim:          896 kB
PageTables:           72 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:       30444 kB
Committed_AS:       1092 kB
VmallocTotal:     917504 kB
VmallocUsed:       33192 kB
VmallocChunk:     876540 kB
代码位于fs/proc/meminfo.c
module_init(proc_meminfo_init);