xref: /openbmc/linux/fs/proc/Kconfig (revision b6bec26c)
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 
35 config PROC_VMCORE
36 	bool "/proc/vmcore support"
37 	depends on PROC_FS && CRASH_DUMP
38 	default y
39         help
40         Exports the dump image of crashed kernel in ELF format.
41 
42 config PROC_SYSCTL
43 	bool "Sysctl support (/proc/sys)" if EXPERT
44 	depends on PROC_FS
45 	select SYSCTL
46 	default y
47 	---help---
48 	  The sysctl interface provides a means of dynamically changing
49 	  certain kernel parameters and variables on the fly without requiring
50 	  a recompile of the kernel or reboot of the system.  The primary
51 	  interface is through /proc/sys.  If you say Y here a tree of
52 	  modifiable sysctl entries will be generated beneath the
53           /proc/sys directory. They are explained in the files
54 	  in <file:Documentation/sysctl/>.  Note that enabling this
55 	  option will enlarge the kernel by at least 8 KB.
56 
57 	  As it is generally a good thing, you should say Y here unless
58 	  building a kernel for install/rescue disks or your system is very
59 	  limited in memory.
60 
61 config PROC_PAGE_MONITOR
62  	default y
63 	depends on PROC_FS && MMU
64 	bool "Enable /proc page monitoring" if EXPERT
65  	help
66 	  Various /proc files exist to monitor process memory utilization:
67 	  /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
68 	  /proc/kpagecount, and /proc/kpageflags. Disabling these
69           interfaces will reduce the size of the kernel by approximately 4kb.
70