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Linux/fs/proc/Kconfig

  1 config PROC_FS
  2         bool "/proc file system support" if EXPERT
  3         default y
  4         help
  5           This is a virtual file system providing information about the status
  6           of the system. "Virtual" means that it doesn't take up any space on
  7           your hard disk: the files are created on the fly by the kernel when
  8           you try to access them. Also, you cannot read the files with older
  9           version of the program less: you need to use more or cat.
 10 
 11           It's totally cool; for example, "cat /proc/interrupts" gives
 12           information about what the different IRQs are used for at the moment
 13           (there is a small number of Interrupt ReQuest lines in your computer
 14           that are used by the attached devices to gain the CPU's attention --
 15           often a source of trouble if two devices are mistakenly configured
 16           to use the same IRQ). The program procinfo to display some
 17           information about your system gathered from the /proc file system.
 18 
 19           Before you can use the /proc file system, it has to be mounted,
 20           meaning it has to be given a location in the directory hierarchy.
 21           That location should be /proc. A command such as "mount -t proc proc
 22           /proc" or the equivalent line in /etc/fstab does the job.
 23 
 24           The /proc file system is explained in the file
 25           <file:Documentation/filesystems/proc.txt> and on the proc(5) manpage
 26           ("man 5 proc").
 27 
 28           This option will enlarge your kernel by about 67 KB. Several
 29           programs depend on this, so everyone should say Y here.
 30 
 31 config PROC_KCORE
 32         bool "/proc/kcore support" if !ARM
 33         depends on PROC_FS && MMU
 34         help
 35           Provides a virtual ELF core file of the live kernel.  This can
 36           be read with gdb and other ELF tools.  No modifications can be
 37           made using this mechanism.
 38 
 39 config PROC_VMCORE
 40         bool "/proc/vmcore support"
 41         depends on PROC_FS && CRASH_DUMP
 42         default y
 43         help
 44         Exports the dump image of crashed kernel in ELF format.
 45 
 46 config PROC_SYSCTL
 47         bool "Sysctl support (/proc/sys)" if EXPERT
 48         depends on PROC_FS
 49         select SYSCTL
 50         default y
 51         ---help---
 52           The sysctl interface provides a means of dynamically changing
 53           certain kernel parameters and variables on the fly without requiring
 54           a recompile of the kernel or reboot of the system.  The primary
 55           interface is through /proc/sys.  If you say Y here a tree of
 56           modifiable sysctl entries will be generated beneath the
 57           /proc/sys directory. They are explained in the files
 58           in <file:Documentation/sysctl/>.  Note that enabling this
 59           option will enlarge the kernel by at least 8 KB.
 60 
 61           As it is generally a good thing, you should say Y here unless
 62           building a kernel for install/rescue disks or your system is very
 63           limited in memory.
 64 
 65 config PROC_PAGE_MONITOR
 66         default y
 67         depends on PROC_FS && MMU
 68         bool "Enable /proc page monitoring" if EXPERT
 69         help
 70           Various /proc files exist to monitor process memory utilization:
 71           /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
 72           /proc/kpagecount, and /proc/kpageflags. Disabling these
 73           interfaces will reduce the size of the kernel by approximately 4kb.

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