LXR linux/fs/proc/Kconfig

   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 CRASH_CORE
  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        default n
  96        help
  97          Provides a fast way to retrieve first level children pids of a task. See
  98          <file:Documentation/filesystems/proc.rst> for more information.
  99
 100          Say Y if you are running any user-space software which takes benefit from
 101          this interface. For example, rkt is such a piece of software.
 102
 103config PROC_PID_ARCH_STATUS
 104        def_bool n
 105        depends on PROC_FS
 106
 107config PROC_CPU_RESCTRL
 108        def_bool n
 109        depends on PROC_FS
 110