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 help 35 Provides a virtual ELF core file of the live kernel. This can 36 be read with gdb and other ELF tools. No modifications can be 37 made using this mechanism. 38 39config PROC_VMCORE 40 bool "/proc/vmcore support" 41 depends on PROC_FS && CRASH_DUMP 42 default y 43 help 44 Exports the dump image of crashed kernel in ELF format. 45 46config PROC_VMCORE_DEVICE_DUMP 47 bool "Device Hardware/Firmware Log Collection" 48 depends on PROC_VMCORE 49 default n 50 help 51 After kernel panic, device drivers can collect the device 52 specific snapshot of their hardware or firmware before the 53 underlying devices are initialized in crash recovery kernel. 54 Note that the device driver must be present in the crash 55 recovery kernel's initramfs to collect its underlying device 56 snapshot. 57 58 If you say Y here, the collected device dumps will be added 59 as ELF notes to /proc/vmcore. 60 61config PROC_SYSCTL 62 bool "Sysctl support (/proc/sys)" if EXPERT 63 depends on PROC_FS 64 select SYSCTL 65 default y 66 ---help--- 67 The sysctl interface provides a means of dynamically changing 68 certain kernel parameters and variables on the fly without requiring 69 a recompile of the kernel or reboot of the system. The primary 70 interface is through /proc/sys. If you say Y here a tree of 71 modifiable sysctl entries will be generated beneath the 72 /proc/sys directory. They are explained in the files 73 in <file:Documentation/sysctl/>. Note that enabling this 74 option will enlarge the kernel by at least 8 KB. 75 76 As it is generally a good thing, you should say Y here unless 77 building a kernel for install/rescue disks or your system is very 78 limited in memory. 79 80config PROC_PAGE_MONITOR 81 default y 82 depends on PROC_FS && MMU 83 bool "Enable /proc page monitoring" if EXPERT 84 help 85 Various /proc files exist to monitor process memory utilization: 86 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap, 87 /proc/kpagecount, and /proc/kpageflags. Disabling these 88 interfaces will reduce the size of the kernel by approximately 4kb. 89 90config PROC_CHILDREN 91 bool "Include /proc/<pid>/task/<tid>/children file" 92 default n 93 help 94 Provides a fast way to retrieve first level children pids of a task. See 95 <file:Documentation/filesystems/proc.txt> for more information. 96 97 Say Y if you are running any user-space software which takes benefit from 98 this interface. For example, rkt is such a piece of software. 99