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