Chapter 2. The
proc
File System
47
  dentry state
  Provides the status of the directory cache. The file looks similar to this:
57411 52939 45 0 0 0
The first number reveals the total number of directory cache entries, while the second number
displays the number of unused entries. The third number tells the number of seconds between when
a directory has been freed and when it can be reclaimed, and the fourth measures the pages currently
requested by the system. The last two numbers are not used and currently display only zeros.
  dquot nr
  Shows the maximum number of cached disk quota entries.
  file max
  Allows you to change the maximum number of file handles that the kernel will
allocate. Raising the value in this file can resolve errors caused by a lack of available file handles.
  file nr
  Displays the number of allocated file handles, used file handles, and the maximum
number of file handles.
  overflowgid
and
overflowuid
  Defines the fixed group ID and user ID, respectively, for use
with file systems that only support 16 bit group and user IDs.
  super max
  Controls the maximum number of superblocks available.
  super nr
  Displays the current number of superblocks in use.
2.3.9.3.
/proc/sys/kernel/
This directory contains a variety of different configuration files that directly affect the operation of the
kernel. Some of the most important files include:
  acct
  Controls the suspension of process accounting based on the percentage of free space
available on the file system containing the log. By default, the file looks like this:
4 2 30
The second value sets the threshold percentage of free space when logging will be suspended, while
the first value dictates the percentage of free space required for logging to resume. The third value
sets the interval in seconds that the kernel polls the file system to see if logging should be suspended
or resumed.
  cap bound
  Controls the capability bounding settings, which provide a list of capabilities for any
process on the system. If a capability is not listed here, then no process, no matter how privileged,
can do it. The idea is to make the system more secure by ensuring that certain things cannot happen,
at least beyond a certain point in the boot process.
The various values that are possible here are beyond the scope of this manual, so consult the kernel
documentation for more information.
  ctrl alt del
  Controls whether [Ctrl] [Alt] [Delete] will gracefully restart the computer us 
ing
init
(value
0
) or force an immediate reboot without syncing the dirty buffers to disk (value
1
).
  domainname
  Allows you to configure the system's domain name, such as
subgenius.com
.
  hostname
  Allows you to configure the system's host name, such as
bob.subgenius.com
.
  hotplug
  Configures the utility to be used when a configuration change is detected by the system.
This is primarily used with USB and Cardbus PCI. The default value of
/sbin/hotplug
should
not be changed unless you are testing a new program to fulfill this role.
  modprobe
  Sets the location of the program to be used to load kernel modules when necessary.
The default value of
/sbin/modprobe
signifies that
kmod
will call it to actually load the module
when a kernel thread calls
kmod
.
  msgmax
  Sets the maximum size of any message sent from one process to another is set to
8192
bytes by default. You should be careful about raising this value, as queued messages between






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