1 config 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 31 config 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 39 config 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 46 config PROC_SYSCTL 47 bool "Sysctl support (/proc/sys)" if EXPERT 48 depends on PROC_FS 49 select SYSCTL 50 default y 51 ---help--- 52 The sysctl interface provides a means of dynamically changing 53 certain kernel parameters and variables on the fly without requiring 54 a recompile of the kernel or reboot of the system. The primary 55 interface is through /proc/sys. If you say Y here a tree of 56 modifiable sysctl entries will be generated beneath the 57 /proc/sys directory. They are explained in the files 58 in <file:Documentation/sysctl/>. Note that enabling this 59 option will enlarge the kernel by at least 8 KB. 60 61 As it is generally a good thing, you should say Y here unless 62 building a kernel for install/rescue disks or your system is very 63 limited in memory. 64 65 config PROC_PAGE_MONITOR 66 default y 67 depends on PROC_FS && MMU 68 bool "Enable /proc page monitoring" if EXPERT 69 help 70 Various /proc files exist to monitor process memory utilization: 71 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap, 72 /proc/kpagecount, and /proc/kpageflags. Disabling these 73 interfaces will reduce the size of the kernel by approximately 4kb.