linux-3.3/init/Kconfig

14 	default "/etc/kernel-config"
15 	default "/boot/config-$UNAME_RELEASE"
34 	---help---
39 	  known as the "alpha-test" phase among developers. If a feature is
40 	  currently in alpha-test, then the developers usually discourage
48 	  <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
49 	  <file:Documentation/BUG-HUNTING>, and
50 	  <file:Documentation/oops-tracing.txt> in the kernel source).
61 	  drivers that are currently considered to be in the alpha-test phase.
81 	string "Cross-compiler tool prefix"
83 	  Same as running 'make CROSS_COMPILE=prefix-' but stored for
86 	  directory to select the cross-compiler automatically.
89 	string "Local version - append to kernel release"
106 	  A string of the format -gxxxxxxxx will be added to the localversion
107 	  if a git-based tree is found.  The string generated by this will be
114 	    $ git rev-parse --verify HEAD
138 	  The linux kernel is a kind of self-extracting executable.
169 	  Bzip2 uses a large amount of memory. For modern kernels you
189 	  filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ
216 	bool "Support for paging of anonymous memory (swap)"
222 	  used to provide more virtual memory than the actual RAM present
227 	---help---
233 	  DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
249 	---help---
276 	  command name, memory usage, controlling terminal etc. (the complete
319 	bool "Enable per-task delay accounting (EXPERIMENTAL)"
339 	bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
353 	  logging of avc messages output).  Does not do system-call
357 	bool "Enable system-call auditing support"
361 	  Enable low-overhead system-call auditing infrastructure that
398 	bool "Tree-based hierarchical RCU"
407 	bool "Preemptible tree-based hierarchical RCU"
412 	  thousands of CPUs, but for which real-time response
417 	bool "UP-only small-memory-footprint RCU"
421 	  designed for UP systems from which real-time response
423 	  memory footprint of RCU.
426 	bool "Preemptible UP-only small-memory-footprint RCU"
430 	  for real-time UP systems.  This option greatly reduces the
431 	  memory footprint of RCU.
438 	  This option enables preemptible-RCU code that is common between
451 	int "Tree-based hierarchical RCU fanout value"
463 	  systems, but if you are stress-testing the RCU implementation
464 	  itself, small RCU_FANOUT values allow you to test large-system
471 	bool "Disable tree-based hierarchical RCU auto-balancing"
485 	bool "Accelerate last non-dyntick-idle CPU's grace periods"
490 	  in order to allow CPUs to enter dynticks-idle state more
492 	  of the dynticks-idle checking, particularly on systems with
518 	  Say Y here if you are working with real-time apps or heavy loads
522 	int "Real-time priority to boost RCU readers to"
527 	  This option specifies the real-time priority to which preempted
528 	  RCU readers are to be boosted.  If you are working with CPU-bound
529 	  real-time applications, you should specify a priority higher then
530 	  the highest-priority CPU-bound application.
532 	  Specify the real-time priority, or take the default if unsure.
535 	int "Milliseconds to delay boosting after RCU grace-period start"
541 	  a given grace period before priority-boosting preempted RCU
551 	---help---
555 	  on-disk kernel.  This information can be extracted from the kernel
556 	  image file with the script scripts/extract-ikconfig and used as
564 	---help---
593 	  use with process control subsystems such as Cpusets, CFS, memory
596 		- Documentation/scheduler/sched-design-CFS.txt	(CFS)
597 		- Documentation/cgroups/ (features for grouping, isolation
621 	bool "Device controller for cgroups"
631 	  Memory Nodes and assigning tasks to run only within those sets.
644 	  Provides a simple Resource Controller for monitoring the
650 	  This option enables controller independent resource accounting
654 	bool "Memory Resource Controller for Control Groups"
658 	  Provides a memory resource controller that manages both anonymous
659 	  memory and page cache. (See Documentation/cgroups/memory.txt)
661 	  Note that setting this option increases fixed memory overhead
662 	  associated with each page of memory in the system. By this,
663 	  20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
668 	  sure you need the memory resource controller. Even when you enable
669 	  this, you can set "cgroup_disable=memory" at your boot option to
670 	  disable memory resource controller and you can avoid overheads.
671 	  (and lose benefits of memory resource controller)
677 	bool "Memory Resource Controller Swap Extension"
680 	  Add swap management feature to memory resource controller. When you
682 	  when you disable this, memory resource controller has no cares to
685 	  adds more overheads and consumes memory for remembering information.
686 	  Especially if you use 32bit system or small memory system, please
687 	  be careful about enabling this. When memory resource controller
691 	  Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
694 	bool "Memory Resource Controller Swap Extension enabled by default"
698 	  Memory Resource Controller Swap Extension comes with its price in
699 	  a bigger memory consumption. General purpose distribution kernels
707 	bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
711 	  The Kernel Memory extension for Memory Resource Controller can limit
712 	  the amount of memory used by kernel objects in the system. Those are
714 	  Memory Controller, which are page-based, and can be swapped. Users of
719 	bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
722 	  This option extends the per-cpu mode to restrict monitoring to
752 	  See tip/Documentation/scheduler/sched-bwc.txt for more information.
762 	  schedule realtime tasks for non-root users until you allocate
764 	  See Documentation/scheduler/sched-rt-group.txt for more information.
769 	tristate "Block IO controller"
772 	---help---
773 	Generic block IO controller cgroup interface. This is the common
782 	This option only enables generic Block IO controller infrastructure.
788 	See Documentation/cgroups/blkio-controller.txt for more information.
791 	bool "Enable Block IO controller debugging"
794 	---help---
919 	bool "Kernel->user space relay support (formerly relayfs)"
954 	  Enabling this option will pass "-Os" instead of "-O2" to gcc
967 	# Unhide debug options, to make the on-by-default options visible
972           environments which can tolerate a "non-standard" kernel.
976 	bool "Enable 16-bit UID system calls" if EXPERT
980 	  This enables the legacy 16-bit UID syscall wrappers.
987 	---help---
1025 	bool "Support for hot-pluggable devices" if EXPERT
1061 	bool "Enable PC-Speaker support" if EXPERT
1066           This option allows to disable the internal PC-Speaker
1067           support, saving some memory.
1074 	bool "Enable full-sized data structures for core" if EXPERT
1077 	  kernel data structures. This saves memory on small machines,
1087 	  run glibc-based applications correctly.
1132 	  The shmem is an internal filesystem used to manage shared memory.
1176 	  Software events are supported either built-in or via the
1182 	  suffered, or branches mis-predicted - without slowing down the
1184 	  when a threshold number of events have passed - and can thus be
1200 	  config option - please see that one for details.
1213 	 Use vmalloc memory to back perf mmap() buffers.
1260 	  On non-ancient distros (post-2000 ones) N is usually a safe choice.
1281 	   of queues of objects. SLUB can use memory efficiently
1296 	bool "Allow mmapped anonymous memory to be uninitialized"
1300 	  Normally, and according to the Linux spec, anonymous memory obtained
1308 	  ELF-FDPIC binfmt's brk and stack allocator.
1312 	  userspace.  Since that isn't generally a problem on no-MMU systems,
1315 	  See Documentation/nommu-mmap.txt for more information.
1379 	  --force).  Forced module loading sets the 'F' (forced) taint flag and
1396 	  without waiting for anyone to stop using it (using the -f option to