xref: /openbmc/linux/fs/proc/Kconfig (revision ba61bb17)
1config 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
31config 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
39config 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
46config PROC_VMCORE_DEVICE_DUMP
47	bool "Device Hardware/Firmware Log Collection"
48	depends on PROC_VMCORE
49	default n
50	help
51	  After kernel panic, device drivers can collect the device
52	  specific snapshot of their hardware or firmware before the
53	  underlying devices are initialized in crash recovery kernel.
54	  Note that the device driver must be present in the crash
55	  recovery kernel's initramfs to collect its underlying device
56	  snapshot.
57
58	  If you say Y here, the collected device dumps will be added
59	  as ELF notes to /proc/vmcore.
60
61config PROC_SYSCTL
62	bool "Sysctl support (/proc/sys)" if EXPERT
63	depends on PROC_FS
64	select SYSCTL
65	default y
66	---help---
67	  The sysctl interface provides a means of dynamically changing
68	  certain kernel parameters and variables on the fly without requiring
69	  a recompile of the kernel or reboot of the system.  The primary
70	  interface is through /proc/sys.  If you say Y here a tree of
71	  modifiable sysctl entries will be generated beneath the
72          /proc/sys directory. They are explained in the files
73	  in <file:Documentation/sysctl/>.  Note that enabling this
74	  option will enlarge the kernel by at least 8 KB.
75
76	  As it is generally a good thing, you should say Y here unless
77	  building a kernel for install/rescue disks or your system is very
78	  limited in memory.
79
80config PROC_PAGE_MONITOR
81 	default y
82	depends on PROC_FS && MMU
83	bool "Enable /proc page monitoring" if EXPERT
84 	help
85	  Various /proc files exist to monitor process memory utilization:
86	  /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
87	  /proc/kpagecount, and /proc/kpageflags. Disabling these
88          interfaces will reduce the size of the kernel by approximately 4kb.
89
90config PROC_CHILDREN
91	bool "Include /proc/<pid>/task/<tid>/children file"
92	default n
93	help
94	  Provides a fast way to retrieve first level children pids of a task. See
95	  <file:Documentation/filesystems/proc.txt> for more information.
96
97	  Say Y if you are running any user-space software which takes benefit from
98	  this interface. For example, rkt is such a piece of software.
99