Kconfig 4.1 KB

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  1. # SPDX-License-Identifier: GPL-2.0-only
  2. config 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. 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. Before you can use the /proc file system, it has to be mounted,
  19. meaning it has to be given a location in the directory hierarchy.
  20. That location should be /proc. A command such as "mount -t proc proc
  21. /proc" or the equivalent line in /etc/fstab does the job.
  22. The /proc file system is explained in the file
  23. <file:Documentation/filesystems/proc.rst> and on the proc(5) manpage
  24. ("man 5 proc").
  25. This option will enlarge your kernel by about 67 KB. Several
  26. programs depend on this, so everyone should say Y here.
  27. config PROC_KCORE
  28. bool "/proc/kcore support" if !ARM
  29. depends on PROC_FS && MMU
  30. select CRASH_CORE
  31. help
  32. Provides a virtual ELF core file of the live kernel. This can
  33. be read with gdb and other ELF tools. No modifications can be
  34. made using this mechanism.
  35. config 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. config PROC_VMCORE_DEVICE_DUMP
  42. bool "Device Hardware/Firmware Log Collection"
  43. depends on PROC_VMCORE
  44. default n
  45. help
  46. After kernel panic, device drivers can collect the device
  47. specific snapshot of their hardware or firmware before the
  48. underlying devices are initialized in crash recovery kernel.
  49. Note that the device driver must be present in the crash
  50. recovery kernel's initramfs to collect its underlying device
  51. snapshot.
  52. If you say Y here, the collected device dumps will be added
  53. as ELF notes to /proc/vmcore. You can still disable device
  54. dump using the kernel command line option 'novmcoredd'.
  55. config PROC_SYSCTL
  56. bool "Sysctl support (/proc/sys)" if EXPERT
  57. depends on PROC_FS
  58. select SYSCTL
  59. default y
  60. help
  61. The sysctl interface provides a means of dynamically changing
  62. certain kernel parameters and variables on the fly without requiring
  63. a recompile of the kernel or reboot of the system. The primary
  64. interface is through /proc/sys. If you say Y here a tree of
  65. modifiable sysctl entries will be generated beneath the
  66. /proc/sys directory. They are explained in the files
  67. in <file:Documentation/admin-guide/sysctl/>. Note that enabling this
  68. option will enlarge the kernel by at least 8 KB.
  69. As it is generally a good thing, you should say Y here unless
  70. building a kernel for install/rescue disks or your system is very
  71. limited in memory.
  72. config PROC_PAGE_MONITOR
  73. default y
  74. depends on PROC_FS && MMU
  75. bool "Enable /proc page monitoring" if EXPERT
  76. help
  77. Various /proc files exist to monitor process memory utilization:
  78. /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
  79. /proc/kpagecount, and /proc/kpageflags. Disabling these
  80. interfaces will reduce the size of the kernel by approximately 4kb.
  81. config PROC_CHILDREN
  82. bool "Include /proc/<pid>/task/<tid>/children file"
  83. default n
  84. help
  85. Provides a fast way to retrieve first level children pids of a task. See
  86. <file:Documentation/filesystems/proc.rst> for more information.
  87. Say Y if you are running any user-space software which takes benefit from
  88. this interface. For example, rkt is such a piece of software.
  89. config PROC_PID_ARCH_STATUS
  90. def_bool n
  91. depends on PROC_FS
  92. config PROC_CPU_RESCTRL
  93. def_bool n
  94. depends on PROC_FS