1# SPDX-License-Identifier: GPL-2.0-only
2config PROC_FS
3	bool "/proc file system support" if EXPERT
4	default y
5	help
6	  This is a virtual file system providing information about the status
7	  of the system. "Virtual" means that it doesn't take up any space on
8	  your hard disk: the files are created on the fly by the kernel when
9	  you try to access them. Also, you cannot read the files with older
10	  version of the program less: you need to use more or cat.
11
12	  It's totally cool; for example, "cat /proc/interrupts" gives
13	  information about what the different IRQs are used for at the moment
14	  (there is a small number of Interrupt ReQuest lines in your computer
15	  that are used by the attached devices to gain the CPU's attention --
16	  often a source of trouble if two devices are mistakenly configured
17	  to use the same IRQ). The program procinfo to display some
18	  information about your system gathered from the /proc file system.
19
20	  Before you can use the /proc file system, it has to be mounted,
21	  meaning it has to be given a location in the directory hierarchy.
22	  That location should be /proc. A command such as "mount -t proc proc
23	  /proc" or the equivalent line in /etc/fstab does the job.
24
25	  The /proc file system is explained in the file
26	  <file:Documentation/filesystems/proc.rst> and on the proc(5) manpage
27	  ("man 5 proc").
28
29	  This option will enlarge your kernel by about 67 KB. Several
30	  programs depend on this, so everyone should say Y here.
31
32config PROC_KCORE
33	bool "/proc/kcore support" if !ARM
34	depends on PROC_FS && MMU
35	select VMCORE_INFO
36	help
37	  Provides a virtual ELF core file of the live kernel.  This can
38	  be read with gdb and other ELF tools.  No modifications can be
39	  made using this mechanism.
40
41config PROC_VMCORE
42	bool "/proc/vmcore support"
43	depends on PROC_FS && CRASH_DUMP
44	default y
45	help
46	  Exports the dump image of crashed kernel in ELF format.
47
48config PROC_VMCORE_DEVICE_DUMP
49	bool "Device Hardware/Firmware Log Collection"
50	depends on PROC_VMCORE
51	default n
52	help
53	  After kernel panic, device drivers can collect the device
54	  specific snapshot of their hardware or firmware before the
55	  underlying devices are initialized in crash recovery kernel.
56	  Note that the device driver must be present in the crash
57	  recovery kernel's initramfs to collect its underlying device
58	  snapshot.
59
60	  If you say Y here, the collected device dumps will be added
61	  as ELF notes to /proc/vmcore. You can still disable device
62	  dump using the kernel command line option 'novmcoredd'.
63
64config PROC_SYSCTL
65	bool "Sysctl support (/proc/sys)" if EXPERT
66	depends on PROC_FS
67	select SYSCTL
68	default y
69	help
70	  The sysctl interface provides a means of dynamically changing
71	  certain kernel parameters and variables on the fly without requiring
72	  a recompile of the kernel or reboot of the system.  The primary
73	  interface is through /proc/sys.  If you say Y here a tree of
74	  modifiable sysctl entries will be generated beneath the
75	  /proc/sys directory. They are explained in the files
76	  in <file:Documentation/admin-guide/sysctl/>.  Note that enabling this
77	  option will enlarge the kernel by at least 8 KB.
78
79	  As it is generally a good thing, you should say Y here unless
80	  building a kernel for install/rescue disks or your system is very
81	  limited in memory.
82
83config PROC_PAGE_MONITOR
84 	default y
85	depends on PROC_FS && MMU
86	bool "Enable /proc page monitoring" if EXPERT
87 	help
88	  Various /proc files exist to monitor process memory utilization:
89	  /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
90	  /proc/kpagecount, and /proc/kpageflags. Disabling these
91	  interfaces will reduce the size of the kernel by approximately 4kb.
92
93config PROC_CHILDREN
94	bool "Include /proc/<pid>/task/<tid>/children file"
95	depends on PROC_FS
96	default n
97	help
98	  Provides a fast way to retrieve first level children pids of a task. See
99	  <file:Documentation/filesystems/proc.rst> for more information.
100
101	  Say Y if you are running any user-space software which takes benefit from
102	  this interface. For example, rkt is such a piece of software.
103
104config PROC_PID_ARCH_STATUS
105	def_bool n
106	depends on PROC_FS
107
108config PROC_CPU_RESCTRL
109	def_bool n
110	depends on PROC_FS
111