fs/proc/Kconfig v3.0-rc7

PROC_FS

/proc file system support

This is a virtual file system providing information about the status
of the system. "Virtual" means that it doesn't take up any space on
your hard disk: the files are created on the fly by the kernel when
you try to access them. Also, you cannot read the files with older
version of the program less: you need to use more or cat.

It's totally cool; for example, "cat /proc/interrupts" gives
information about what the different IRQs are used for at the moment
(there is a small number of Interrupt ReQuest lines in your computer
that are used by the attached devices to gain the CPU's attention --
often a source of trouble if two devices are mistakenly configured
to use the same IRQ). The program procinfo to display some
information about your system gathered from the /proc file system.

Before you can use the /proc file system, it has to be mounted,
meaning it has to be given a location in the directory hierarchy.
That location should be /proc. A command such as "mount -t proc proc
/proc" or the equivalent line in /etc/fstab does the job.

The /proc file system is explained in the file
<file:Documentation/filesystems/proc.txt> and on the proc(5) manpage
("man 5 proc").

This option will enlarge your kernel by about 67 KB. Several
programs depend on this, so everyone should say Y here.

PROC_VMCORE

/proc/vmcore support

Exports the dump image of crashed kernel in ELF format.

PROC_SYSCTL

Sysctl support (/proc/sys)

The sysctl interface provides a means of dynamically changing
certain kernel parameters and variables on the fly without requiring
a recompile of the kernel or reboot of the system.  The primary
interface is through /proc/sys.  If you say Y here a tree of
modifiable sysctl entries will be generated beneath the
/proc/sys directory. They are explained in the files
in <file:Documentation/sysctl/>.  Note that enabling this
option will enlarge the kernel by at least 8 KB.

As it is generally a good thing, you should say Y here unless
building a kernel for install/rescue disks or your system is very
limited in memory.

PROC_PAGE_MONITOR

Enable /proc page monitoring

Various /proc files exist to monitor process memory utilization:
/proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
/proc/kpagecount, and /proc/kpageflags. Disabling these
interfaces will reduce the size of the kernel by approximately 4kb.