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1# SPDX-License-Identifier: GPL-2.0-only2config PROC_FS3 bool "/proc file system support" if EXPERT4 default y5 help6 This is a virtual file system providing information about the status7 of the system. "Virtual" means that it doesn't take up any space on8 your hard disk: the files are created on the fly by the kernel when9 you try to access them. Also, you cannot read the files with older10 version of the program less: you need to use more or cat.11 12 It's totally cool; for example, "cat /proc/interrupts" gives13 information about what the different IRQs are used for at the moment14 (there is a small number of Interrupt ReQuest lines in your computer15 that are used by the attached devices to gain the CPU's attention --16 often a source of trouble if two devices are mistakenly configured17 to use the same IRQ). The program procinfo to display some18 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 proc23 /proc" or the equivalent line in /etc/fstab does the job.24 25 The /proc file system is explained in the file26 <file:Documentation/filesystems/proc.rst> and on the proc(5) manpage27 ("man 5 proc").28 29 This option will enlarge your kernel by about 67 KB. Several30 programs depend on this, so everyone should say Y here.31 32config PROC_KCORE33 bool "/proc/kcore support" if !ARM34 depends on PROC_FS && MMU35 select VMCORE_INFO36 help37 Provides a virtual ELF core file of the live kernel. This can38 be read with gdb and other ELF tools. No modifications can be39 made using this mechanism.40 41config PROC_VMCORE42 bool "/proc/vmcore support"43 depends on PROC_FS && CRASH_DUMP44 default y45 help46 Exports the dump image of crashed kernel in ELF format.47 48config PROC_VMCORE_DEVICE_DUMP49 bool "Device Hardware/Firmware Log Collection"50 depends on PROC_VMCORE51 default n52 help53 After kernel panic, device drivers can collect the device54 specific snapshot of their hardware or firmware before the55 underlying devices are initialized in crash recovery kernel.56 Note that the device driver must be present in the crash57 recovery kernel's initramfs to collect its underlying device58 snapshot.59 60 If you say Y here, the collected device dumps will be added61 as ELF notes to /proc/vmcore. You can still disable device62 dump using the kernel command line option 'novmcoredd'.63 64config PROC_SYSCTL65 bool "Sysctl support (/proc/sys)" if EXPERT66 depends on PROC_FS67 select SYSCTL68 default y69 help70 The sysctl interface provides a means of dynamically changing71 certain kernel parameters and variables on the fly without requiring72 a recompile of the kernel or reboot of the system. The primary73 interface is through /proc/sys. If you say Y here a tree of74 modifiable sysctl entries will be generated beneath the75 /proc/sys directory. They are explained in the files76 in <file:Documentation/admin-guide/sysctl/>. Note that enabling this77 option will enlarge the kernel by at least 8 KB.78 79 As it is generally a good thing, you should say Y here unless80 building a kernel for install/rescue disks or your system is very81 limited in memory.82 83config PROC_PAGE_MONITOR84 default y85 depends on PROC_FS && MMU86 bool "Enable /proc page monitoring" if EXPERT87 help88 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 these91 interfaces will reduce the size of the kernel by approximately 4kb.92 93config PROC_CHILDREN94 bool "Include /proc/<pid>/task/<tid>/children file"95 depends on PROC_FS96 default n97 help98 Provides a fast way to retrieve first level children pids of a task. See99 <file:Documentation/filesystems/proc.rst> for more information.100 101 Say Y if you are running any user-space software which takes benefit from102 this interface. For example, rkt is such a piece of software.103 104config PROC_PID_ARCH_STATUS105 def_bool n106 depends on PROC_FS107 108config PROC_CPU_RESCTRL109 def_bool n110 depends on PROC_FS111