Root/fs/proc/Kconfig

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
35config 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
42config 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
61config 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

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