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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
6eedf8d3 | 2 | config PROC_FS |
6a108a14 | 3 | bool "/proc file system support" if EXPERT |
6eedf8d3 AD |
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.txt> 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 | ||
32 | config PROC_KCORE | |
33 | bool "/proc/kcore support" if !ARM | |
34 | depends on PROC_FS && MMU | |
23c85094 | 35 | select CRASH_CORE |
1c3fc3e5 RD |
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. | |
6eedf8d3 AD |
40 | |
41 | config PROC_VMCORE | |
a4f7326d WC |
42 | bool "/proc/vmcore support" |
43 | depends on PROC_FS && CRASH_DUMP | |
6eedf8d3 AD |
44 | default y |
45 | help | |
46 | Exports the dump image of crashed kernel in ELF format. | |
47 | ||
2724273e RL |
48 | config 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. | |
62 | ||
6eedf8d3 | 63 | config PROC_SYSCTL |
6a108a14 | 64 | bool "Sysctl support (/proc/sys)" if EXPERT |
6eedf8d3 AD |
65 | depends on PROC_FS |
66 | select SYSCTL | |
67 | default y | |
68 | ---help--- | |
69 | The sysctl interface provides a means of dynamically changing | |
70 | certain kernel parameters and variables on the fly without requiring | |
71 | a recompile of the kernel or reboot of the system. The primary | |
72 | interface is through /proc/sys. If you say Y here a tree of | |
73 | modifiable sysctl entries will be generated beneath the | |
74 | /proc/sys directory. They are explained in the files | |
75 | in <file:Documentation/sysctl/>. Note that enabling this | |
76 | option will enlarge the kernel by at least 8 KB. | |
77 | ||
78 | As it is generally a good thing, you should say Y here unless | |
79 | building a kernel for install/rescue disks or your system is very | |
80 | limited in memory. | |
53167a3e AD |
81 | |
82 | config PROC_PAGE_MONITOR | |
83 | default y | |
84 | depends on PROC_FS && MMU | |
6a108a14 | 85 | bool "Enable /proc page monitoring" if EXPERT |
53167a3e AD |
86 | help |
87 | Various /proc files exist to monitor process memory utilization: | |
88 | /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap, | |
89 | /proc/kpagecount, and /proc/kpageflags. Disabling these | |
90 | interfaces will reduce the size of the kernel by approximately 4kb. | |
2e13ba54 ILG |
91 | |
92 | config PROC_CHILDREN | |
93 | bool "Include /proc/<pid>/task/<tid>/children file" | |
94 | default n | |
db5d5b36 ILG |
95 | help |
96 | Provides a fast way to retrieve first level children pids of a task. See | |
97 | <file:Documentation/filesystems/proc.txt> for more information. | |
98 | ||
99 | Say Y if you are running any user-space software which takes benefit from | |
100 | this interface. For example, rkt is such a piece of software. |