57a8ec387e
Merge more updates from Andrew Morton:
"VM:
- z3fold fixes and enhancements by Henry Burns and Vitaly Wool
- more accurate reclaimed slab caches calculations by Yafang Shao
- fix MAP_UNINITIALIZED UAPI symbol to not depend on config, by
Christoph Hellwig
- !CONFIG_MMU fixes by Christoph Hellwig
- new novmcoredd parameter to omit device dumps from vmcore, by
Kairui Song
- new test_meminit module for testing heap and pagealloc
initialization, by Alexander Potapenko
- ioremap improvements for huge mappings, by Anshuman Khandual
- generalize kprobe page fault handling, by Anshuman Khandual
- device-dax hotplug fixes and improvements, by Pavel Tatashin
- enable synchronous DAX fault on powerpc, by Aneesh Kumar K.V
- add pte_devmap() support for arm64, by Robin Murphy
- unify locked_vm accounting with a helper, by Daniel Jordan
- several misc fixes
core/lib:
- new typeof_member() macro including some users, by Alexey Dobriyan
- make BIT() and GENMASK() available in asm, by Masahiro Yamada
- changed LIST_POISON2 on x86_64 to 0xdead000000000122 for better
code generation, by Alexey Dobriyan
- rbtree code size optimizations, by Michel Lespinasse
- convert struct pid count to refcount_t, by Joel Fernandes
get_maintainer.pl:
- add --no-moderated switch to skip moderated ML's, by Joe Perches
misc:
- ptrace PTRACE_GET_SYSCALL_INFO interface
- coda updates
- gdb scripts, various"
[ Using merge message suggestion from Vlastimil Babka, with some editing - Linus ]
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits)
fs/select.c: use struct_size() in kmalloc()
mm: add account_locked_vm utility function
arm64: mm: implement pte_devmap support
mm: introduce ARCH_HAS_PTE_DEVMAP
mm: clean up is_device_*_page() definitions
mm/mmap: move common defines to mman-common.h
mm: move MAP_SYNC to asm-generic/mman-common.h
device-dax: "Hotremove" persistent memory that is used like normal RAM
mm/hotplug: make remove_memory() interface usable
device-dax: fix memory and resource leak if hotplug fails
include/linux/lz4.h: fix spelling and copy-paste errors in documentation
ipc/mqueue.c: only perform resource calculation if user valid
include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures
scripts/gdb: add helpers to find and list devices
scripts/gdb: add lx-genpd-summary command
drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl
kernel/pid.c: convert struct pid count to refcount_t
drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings
select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining()
select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR
...
106 lines
4.1 KiB
Plaintext
106 lines
4.1 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config PROC_FS
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bool "/proc file system support" if EXPERT
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default y
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help
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This is a virtual file system providing information about the status
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of the system. "Virtual" means that it doesn't take up any space on
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your hard disk: the files are created on the fly by the kernel when
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you try to access them. Also, you cannot read the files with older
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version of the program less: you need to use more or cat.
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It's totally cool; for example, "cat /proc/interrupts" gives
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information about what the different IRQs are used for at the moment
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(there is a small number of Interrupt ReQuest lines in your computer
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that are used by the attached devices to gain the CPU's attention --
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often a source of trouble if two devices are mistakenly configured
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to use the same IRQ). The program procinfo to display some
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information about your system gathered from the /proc file system.
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Before you can use the /proc file system, it has to be mounted,
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meaning it has to be given a location in the directory hierarchy.
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That location should be /proc. A command such as "mount -t proc proc
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/proc" or the equivalent line in /etc/fstab does the job.
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The /proc file system is explained in the file
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<file:Documentation/filesystems/proc.txt> and on the proc(5) manpage
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("man 5 proc").
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This option will enlarge your kernel by about 67 KB. Several
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programs depend on this, so everyone should say Y here.
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config PROC_KCORE
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bool "/proc/kcore support" if !ARM
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depends on PROC_FS && MMU
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select CRASH_CORE
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help
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Provides a virtual ELF core file of the live kernel. This can
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be read with gdb and other ELF tools. No modifications can be
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made using this mechanism.
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config PROC_VMCORE
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bool "/proc/vmcore support"
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depends on PROC_FS && CRASH_DUMP
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default y
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help
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Exports the dump image of crashed kernel in ELF format.
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config PROC_VMCORE_DEVICE_DUMP
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bool "Device Hardware/Firmware Log Collection"
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depends on PROC_VMCORE
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default n
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help
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After kernel panic, device drivers can collect the device
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specific snapshot of their hardware or firmware before the
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underlying devices are initialized in crash recovery kernel.
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Note that the device driver must be present in the crash
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recovery kernel's initramfs to collect its underlying device
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snapshot.
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If you say Y here, the collected device dumps will be added
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as ELF notes to /proc/vmcore. You can still disable device
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dump using the kernel command line option 'novmcoredd'.
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config PROC_SYSCTL
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bool "Sysctl support (/proc/sys)" if EXPERT
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depends on PROC_FS
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select SYSCTL
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default y
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---help---
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The sysctl interface provides a means of dynamically changing
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certain kernel parameters and variables on the fly without requiring
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a recompile of the kernel or reboot of the system. The primary
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interface is through /proc/sys. If you say Y here a tree of
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modifiable sysctl entries will be generated beneath the
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/proc/sys directory. They are explained in the files
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in <file:Documentation/admin-guide/sysctl/>. Note that enabling this
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option will enlarge the kernel by at least 8 KB.
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As it is generally a good thing, you should say Y here unless
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building a kernel for install/rescue disks or your system is very
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limited in memory.
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config PROC_PAGE_MONITOR
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default y
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depends on PROC_FS && MMU
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bool "Enable /proc page monitoring" if EXPERT
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help
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Various /proc files exist to monitor process memory utilization:
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/proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
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/proc/kpagecount, and /proc/kpageflags. Disabling these
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interfaces will reduce the size of the kernel by approximately 4kb.
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config PROC_CHILDREN
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bool "Include /proc/<pid>/task/<tid>/children file"
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default n
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help
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Provides a fast way to retrieve first level children pids of a task. See
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<file:Documentation/filesystems/proc.txt> for more information.
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Say Y if you are running any user-space software which takes benefit from
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this interface. For example, rkt is such a piece of software.
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config PROC_PID_ARCH_STATUS
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def_bool n
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depends on PROC_FS
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