Chapter 2. The

proc

File System

33

  MemFree

  The amount of physical RAM, in kilobytes, left unused by the system.

  MemShared

  Unused with 2.4 and higher kernels but left in for compatibility with earlier kernel

versions.

  Buffers

  The amount of physical RAM, in kilobytes, used for file buffers.

  Cached

  The amount of physical RAM, in kilobytes, used as cache memory.

  Active

  The total amount of buffer or page cache memory, in kilobytes, that is in active use.

  Inact_dirty

  The total amount of buffer or cache pages, in kilobytes, that might be free and

available.

  Inact_clean

  The total amount of buffer or cache pages in kilobytes that are definitely free and

available.

  Inact_target

  The net amount of allocations per second, in kilobytes, averaged over one

minute.

  HighTotal

and

HighFree

  The total and free amount of memory, respectively, that is not di 

rectly mapped into kernel space. The

HighTotal

value can vary based on the type of kernel used.

  LowTotal

and

LowFree

  The total and free amount of memory, respectively, that is directly

mapped into kernel space. The

LowTotal

value can vary based on the type of kernel used.

  SwapTotal

  The total amount of swap available, in kilobytes.

  SwapFree

  The total amount of swap free, in kilobytes.

2.2.20.

/proc/misc

This file lists miscellaneous drivers registered on the miscellaneous major device, which is device

number 10:

135 rtc

1 psaux

134 apm_bios

The first column is the minor number of each device, and the second column shows the driver in use.

2.2.21.

/proc/modules

This file displays a list of all modules loaded into the kernel. Its contents will vary based on the

configuration and use of your system, but it should be organized in a similar manner to this sample

/proc/modules

file output:

ide cd

27008

0 (autoclean)

cdrom

28960

0 (autoclean) [ide cd]

soundcore

4100

0 (autoclean)

agpgart

31072

0 (unused)

binfmt_misc

5956

1

iscsi

32672

0 (unused)

scsi_mod

94424

1 [iscsi]

autofs

10628

0 (autoclean) (unused)

tulip

48608

1

ext3

60352

2

jbd

39192

2 [ext3]

The first column contains the name of the module. The second column refers to the memory size of the

module, in bytes. The third column tells you whether the module is currently loaded (

1

) or unloaded