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Roman Zippel80daa562008-01-14 04:51:16 +01001config ARCH
2 string
3 option env="ARCH"
4
5config KERNELVERSION
6 string
7 option env="KERNELVERSION"
8
Roman Zippelface4372006-06-08 22:12:45 -07009config DEFCONFIG_LIST
10 string
Paolo 'Blaisorblade' Giarrussob2670eac2006-10-19 23:28:23 -070011 depends on !UML
Roman Zippelface4372006-06-08 22:12:45 -070012 option defconfig_list
13 default "/lib/modules/$UNAME_RELEASE/.config"
14 default "/etc/kernel-config"
15 default "/boot/config-$UNAME_RELEASE"
Sam Ravnborg73531902008-05-25 23:03:18 +020016 default "$ARCH_DEFCONFIG"
Roman Zippelface4372006-06-08 22:12:45 -070017 default "arch/$ARCH/defconfig"
18
Al Boldiff0cfc62007-07-31 00:39:23 -070019menu "General setup"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21config EXPERIMENTAL
22 bool "Prompt for development and/or incomplete code/drivers"
23 ---help---
24 Some of the various things that Linux supports (such as network
25 drivers, file systems, network protocols, etc.) can be in a state
26 of development where the functionality, stability, or the level of
27 testing is not yet high enough for general use. This is usually
28 known as the "alpha-test" phase among developers. If a feature is
29 currently in alpha-test, then the developers usually discourage
30 uninformed widespread use of this feature by the general public to
31 avoid "Why doesn't this work?" type mail messages. However, active
32 testing and use of these systems is welcomed. Just be aware that it
33 may not meet the normal level of reliability or it may fail to work
34 in some special cases. Detailed bug reports from people familiar
35 with the kernel internals are usually welcomed by the developers
36 (before submitting bug reports, please read the documents
37 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
38 <file:Documentation/BUG-HUNTING>, and
39 <file:Documentation/oops-tracing.txt> in the kernel source).
40
41 This option will also make obsoleted drivers available. These are
42 drivers that have been replaced by something else, and/or are
43 scheduled to be removed in a future kernel release.
44
45 Unless you intend to help test and develop a feature or driver that
46 falls into this category, or you have a situation that requires
47 using these features, you should probably say N here, which will
48 cause the configurator to present you with fewer choices. If
49 you say Y here, you will be offered the choice of using features or
50 drivers that are currently considered to be in the alpha-test phase.
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052config BROKEN
53 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55config BROKEN_ON_SMP
56 bool
57 depends on BROKEN || !SMP
58 default y
59
60config LOCK_KERNEL
61 bool
62 depends on SMP || PREEMPT
63 default y
64
65config INIT_ENV_ARG_LIMIT
66 int
Adrian Bunkdd673bc2006-06-30 01:55:51 -070067 default 32 if !UML
68 default 128 if UML
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080070 Maximum of each of the number of arguments and environment
71 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74config LOCALVERSION
75 string "Local version - append to kernel release"
76 help
77 Append an extra string to the end of your kernel version.
78 This will show up when you type uname, for example.
79 The string you set here will be appended after the contents of
80 any files with a filename matching localversion* in your
81 object and source tree, in that order. Your total string can
82 be a maximum of 64 characters.
83
Ryan Andersonaaebf432005-07-31 04:57:49 -040084config LOCALVERSION_AUTO
85 bool "Automatically append version information to the version string"
86 default y
87 help
88 This will try to automatically determine if the current tree is a
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020089 release tree by looking for git tags that belong to the current
90 top of tree revision.
Ryan Andersonaaebf432005-07-31 04:57:49 -040091
92 A string of the format -gxxxxxxxx will be added to the localversion
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020093 if a git-based tree is found. The string generated by this will be
Ryan Andersonaaebf432005-07-31 04:57:49 -040094 appended after any matching localversion* files, and after the value
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020095 set in CONFIG_LOCALVERSION.
Ryan Andersonaaebf432005-07-31 04:57:49 -040096
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020097 (The actual string used here is the first eight characters produced
98 by running the command:
99
100 $ git rev-parse --verify HEAD
101
102 which is done within the script "scripts/setlocalversion".)
Ryan Andersonaaebf432005-07-31 04:57:49 -0400103
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -0800104config HAVE_KERNEL_GZIP
105 bool
106
107config HAVE_KERNEL_BZIP2
108 bool
109
110config HAVE_KERNEL_LZMA
111 bool
112
Alain Knaff30d65db2009-01-04 22:46:17 +0100113choice
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -0800114 prompt "Kernel compression mode"
115 default KERNEL_GZIP
116 depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
117 help
Alain Knaff30d65db2009-01-04 22:46:17 +0100118 The linux kernel is a kind of self-extracting executable.
119 Several compression algorithms are available, which differ
120 in efficiency, compression and decompression speed.
121 Compression speed is only relevant when building a kernel.
122 Decompression speed is relevant at each boot.
123
124 If you have any problems with bzip2 or lzma compressed
125 kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older
126 version of this functionality (bzip2 only), for 2.4, was
127 supplied by Christian Ludwig)
128
129 High compression options are mostly useful for users, who
130 are low on disk space (embedded systems), but for whom ram
131 size matters less.
132
133 If in doubt, select 'gzip'
134
135config KERNEL_GZIP
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -0800136 bool "Gzip"
137 depends on HAVE_KERNEL_GZIP
138 help
139 The old and tried gzip compression. Its compression ratio is
140 the poorest among the 3 choices; however its speed (both
141 compression and decompression) is the fastest.
Alain Knaff30d65db2009-01-04 22:46:17 +0100142
143config KERNEL_BZIP2
144 bool "Bzip2"
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -0800145 depends on HAVE_KERNEL_BZIP2
Alain Knaff30d65db2009-01-04 22:46:17 +0100146 help
147 Its compression ratio and speed is intermediate.
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -0800148 Decompression speed is slowest among the three. The kernel
149 size is about 10% smaller with bzip2, in comparison to gzip.
150 Bzip2 uses a large amount of memory. For modern kernels you
151 will need at least 8MB RAM or more for booting.
Alain Knaff30d65db2009-01-04 22:46:17 +0100152
153config KERNEL_LZMA
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -0800154 bool "LZMA"
155 depends on HAVE_KERNEL_LZMA
156 help
157 The most recent compression algorithm.
158 Its ratio is best, decompression speed is between the other
159 two. Compression is slowest. The kernel size is about 33%
160 smaller with LZMA in comparison to gzip.
Alain Knaff30d65db2009-01-04 22:46:17 +0100161
162endchoice
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164config SWAP
165 bool "Support for paging of anonymous memory (swap)"
David Howells93614012006-09-30 20:45:40 +0200166 depends on MMU && BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 default y
168 help
169 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +0100170 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 used to provide more virtual memory than the actual RAM present
172 in your computer. If unsure say Y.
173
174config SYSVIPC
175 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 ---help---
177 Inter Process Communication is a suite of library functions and
178 system calls which let processes (running programs) synchronize and
179 exchange information. It is generally considered to be a good thing,
180 and some programs won't run unless you say Y here. In particular, if
181 you want to run the DOS emulator dosemu under Linux (read the
182 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
183 you'll need to say Y here.
184
185 You can find documentation about IPC with "info ipc" and also in
186 section 6.4 of the Linux Programmer's Guide, available from
187 <http://www.tldp.org/guides.html>.
188
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800189config SYSVIPC_SYSCTL
190 bool
191 depends on SYSVIPC
192 depends on SYSCTL
193 default y
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195config POSIX_MQUEUE
196 bool "POSIX Message Queues"
197 depends on NET && EXPERIMENTAL
198 ---help---
199 POSIX variant of message queues is a part of IPC. In POSIX message
200 queues every message has a priority which decides about succession
201 of receiving it by a process. If you want to compile and run
202 programs written e.g. for Solaris with use of its POSIX message
Robert P. J. Dayb0e37652007-05-09 07:25:13 +0200203 queues (functions mq_*) say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 POSIX message queues are visible as a filesystem called 'mqueue'
206 and can be mounted somewhere if you want to do filesystem
207 operations on message queues.
208
209 If unsure, say Y.
210
Serge E. Hallynbdc8e5f2009-04-06 19:01:11 -0700211config POSIX_MQUEUE_SYSCTL
212 bool
213 depends on POSIX_MQUEUE
214 depends on SYSCTL
215 default y
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217config BSD_PROCESS_ACCT
218 bool "BSD Process Accounting"
219 help
220 If you say Y here, a user level program will be able to instruct the
221 kernel (via a special system call) to write process accounting
222 information to a file: whenever a process exits, information about
223 that process will be appended to the file by the kernel. The
224 information includes things such as creation time, owning user,
225 command name, memory usage, controlling terminal etc. (the complete
226 list is in the struct acct in <file:include/linux/acct.h>). It is
227 up to the user level program to do useful things with this
228 information. This is generally a good idea, so say Y.
229
230config BSD_PROCESS_ACCT_V3
231 bool "BSD Process Accounting version 3 file format"
232 depends on BSD_PROCESS_ACCT
233 default n
234 help
235 If you say Y here, the process accounting information is written
236 in a new file format that also logs the process IDs of each
237 process and it's parent. Note that this file format is incompatible
238 with previous v0/v1/v2 file formats, so you will need updated tools
239 for processing it. A preliminary version of these tools is available
S.Çağlar Onur37a4c942008-06-18 11:45:13 +0300240 at <http://www.gnu.org/software/acct/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Shailabh Nagarc7572492006-07-14 00:24:40 -0700242config TASKSTATS
243 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
244 depends on NET
245 default n
246 help
247 Export selected statistics for tasks/processes through the
248 generic netlink interface. Unlike BSD process accounting, the
249 statistics are available during the lifetime of tasks/processes as
250 responses to commands. Like BSD accounting, they are sent to user
251 space on task exit.
252
253 Say N if unsure.
254
Shailabh Nagarca74e922006-07-14 00:24:36 -0700255config TASK_DELAY_ACCT
256 bool "Enable per-task delay accounting (EXPERIMENTAL)"
Shailabh Nagar6f449932006-07-14 00:24:41 -0700257 depends on TASKSTATS
Shailabh Nagarca74e922006-07-14 00:24:36 -0700258 help
259 Collect information on time spent by a task waiting for system
260 resources like cpu, synchronous block I/O completion and swapping
261 in pages. Such statistics can help in setting a task's priorities
262 relative to other tasks for cpu, io, rss limits etc.
263
264 Say N if unsure.
265
Alexey Dobriyan18f705f2007-02-10 01:46:44 -0800266config TASK_XACCT
267 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
268 depends on TASKSTATS
269 help
270 Collect extended task accounting data and send the data
271 to userland for processing over the taskstats interface.
272
273 Say N if unsure.
274
275config TASK_IO_ACCOUNTING
276 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
277 depends on TASK_XACCT
278 help
279 Collect information on the number of bytes of storage I/O which this
280 task has caused.
281
282 Say N if unsure.
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284config AUDIT
285 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100286 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 help
288 Enable auditing infrastructure that can be used with another
289 kernel subsystem, such as SELinux (which requires this for
290 logging of avc messages output). Does not do system-call
291 auditing without CONFIG_AUDITSYSCALL.
292
293config AUDITSYSCALL
294 bool "Enable system-call auditing support"
Yuichi Nakamura1322b9d2007-11-10 19:21:34 +0900295 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 default y if SECURITY_SELINUX
297 help
298 Enable low-overhead system-call auditing infrastructure that
299 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400300 such as SELinux. To use audit's filesystem watch feature, please
301 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Al Viro74c3cbe2007-07-22 08:04:18 -0400303config AUDIT_TREE
304 def_bool y
Eric Paris63c882a2009-05-21 17:02:01 -0400305 depends on AUDITSYSCALL
306 select INOTIFY
Al Viro74c3cbe2007-07-22 08:04:18 -0400307
Mike Travisc903ff82009-01-15 12:28:29 -0800308menu "RCU Subsystem"
309
310choice
311 prompt "RCU Implementation"
Paul E. McKenney31c9a242009-04-02 21:06:25 -0700312 default TREE_RCU
Mike Travisc903ff82009-01-15 12:28:29 -0800313
314config CLASSIC_RCU
315 bool "Classic RCU"
316 help
317 This option selects the classic RCU implementation that is
318 designed for best read-side performance on non-realtime
319 systems.
320
321 Select this option if you are unsure.
322
323config TREE_RCU
324 bool "Tree-based hierarchical RCU"
325 help
326 This option selects the RCU implementation that is
327 designed for very large SMP system with hundreds or
328 thousands of CPUs.
329
330config PREEMPT_RCU
331 bool "Preemptible RCU"
332 depends on PREEMPT
333 help
334 This option reduces the latency of the kernel by making certain
335 RCU sections preemptible. Normally RCU code is non-preemptible, if
336 this option is selected then read-only RCU sections become
337 preemptible. This helps latency, but may expose bugs due to
338 now-naive assumptions about each RCU read-side critical section
339 remaining on a given CPU through its execution.
340
341endchoice
342
343config RCU_TRACE
344 bool "Enable tracing for RCU"
345 depends on TREE_RCU || PREEMPT_RCU
346 help
347 This option provides tracing in RCU which presents stats
348 in debugfs for debugging RCU implementation.
349
350 Say Y here if you want to enable RCU tracing
351 Say N if you are unsure.
352
353config RCU_FANOUT
354 int "Tree-based hierarchical RCU fanout value"
355 range 2 64 if 64BIT
356 range 2 32 if !64BIT
357 depends on TREE_RCU
358 default 64 if 64BIT
359 default 32 if !64BIT
360 help
361 This option controls the fanout of hierarchical implementations
362 of RCU, allowing RCU to work efficiently on machines with
363 large numbers of CPUs. This value must be at least the cube
364 root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
365 systems and up to 262,144 for 64-bit systems.
366
367 Select a specific number if testing RCU itself.
368 Take the default if unsure.
369
370config RCU_FANOUT_EXACT
371 bool "Disable tree-based hierarchical RCU auto-balancing"
372 depends on TREE_RCU
373 default n
374 help
375 This option forces use of the exact RCU_FANOUT value specified,
376 regardless of imbalances in the hierarchy. This is useful for
377 testing RCU itself, and might one day be useful on systems with
378 strong NUMA behavior.
379
380 Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
381
382 Say N if unsure.
383
384config TREE_RCU_TRACE
385 def_bool RCU_TRACE && TREE_RCU
386 select DEBUG_FS
387 help
388 This option provides tracing for the TREE_RCU implementation,
389 permitting Makefile to trivially select kernel/rcutree_trace.c.
390
391config PREEMPT_RCU_TRACE
392 def_bool RCU_TRACE && PREEMPT_RCU
393 select DEBUG_FS
394 help
395 This option provides tracing for the PREEMPT_RCU implementation,
396 permitting Makefile to trivially select kernel/rcupreempt_trace.c.
397
398endmenu # "RCU Subsystem"
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700401 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 ---help---
403 This option enables the complete Linux kernel ".config" file
404 contents to be saved in the kernel. It provides documentation
405 of which kernel options are used in a running kernel or in an
406 on-disk kernel. This information can be extracted from the kernel
407 image file with the script scripts/extract-ikconfig and used as
408 input to rebuild the current kernel or to build another kernel.
409 It can also be extracted from a running kernel by reading
410 /proc/config.gz if enabled (below).
411
412config IKCONFIG_PROC
413 bool "Enable access to .config through /proc/config.gz"
414 depends on IKCONFIG && PROC_FS
415 ---help---
416 This option enables access to the kernel configuration file
417 through /proc/config.gz.
418
Alistair John Strachan794543a2007-05-08 00:31:15 -0700419config LOG_BUF_SHIFT
420 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
421 range 12 21
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700422 default 17
Alistair John Strachan794543a2007-05-08 00:31:15 -0700423 help
424 Select kernel log buffer size as a power of 2.
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700425 Examples:
426 17 => 128 KB
427 16 => 64 KB
428 15 => 32 KB
429 14 => 16 KB
Alistair John Strachan794543a2007-05-08 00:31:15 -0700430 13 => 8 KB
431 12 => 4 KB
432
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800433#
434# Architectures with an unreliable sched_clock() should select this:
435#
436config HAVE_UNSTABLE_SCHED_CLOCK
437 bool
438
439config GROUP_SCHED
440 bool "Group CPU scheduler"
441 depends on EXPERIMENTAL
442 default n
443 help
444 This feature lets CPU scheduler recognize task groups and control CPU
445 bandwidth allocation to such task groups.
446 In order to create a group from arbitrary set of processes, use
447 CONFIG_CGROUPS. (See Control Group support.)
448
449config FAIR_GROUP_SCHED
450 bool "Group scheduling for SCHED_OTHER"
451 depends on GROUP_SCHED
452 default GROUP_SCHED
453
454config RT_GROUP_SCHED
455 bool "Group scheduling for SCHED_RR/FIFO"
456 depends on EXPERIMENTAL
457 depends on GROUP_SCHED
458 default n
459 help
460 This feature lets you explicitly allocate real CPU bandwidth
461 to users or control groups (depending on the "Basis for grouping tasks"
462 setting below. If enabled, it will also make it impossible to
463 schedule realtime tasks for non-root users until you allocate
464 realtime bandwidth for them.
465 See Documentation/scheduler/sched-rt-group.txt for more information.
466
467choice
468 depends on GROUP_SCHED
469 prompt "Basis for grouping tasks"
470 default USER_SCHED
471
472config USER_SCHED
473 bool "user id"
474 help
475 This option will choose userid as the basis for grouping
476 tasks, thus providing equal CPU bandwidth to each user.
477
478config CGROUP_SCHED
479 bool "Control groups"
480 depends on CGROUPS
481 help
482 This option allows you to create arbitrary task groups
483 using the "cgroup" pseudo filesystem and control
484 the cpu bandwidth allocated to each such task group.
Li Zefan45ce80f2009-01-15 13:50:59 -0800485 Refer to Documentation/cgroups/cgroups.txt for more
486 information on "cgroup" pseudo filesystem.
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800487
488endchoice
489
Li Zefan23964d22009-01-15 13:50:58 -0800490menuconfig CGROUPS
491 boolean "Control Group support"
Paul Menageddbcc7e2007-10-18 23:39:30 -0700492 help
Li Zefan23964d22009-01-15 13:50:58 -0800493 This option adds support for grouping sets of processes together, for
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800494 use with process control subsystems such as Cpusets, CFS, memory
495 controls or device isolation.
496 See
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800497 - Documentation/scheduler/sched-design-CFS.txt (CFS)
Li Zefan45ce80f2009-01-15 13:50:59 -0800498 - Documentation/cgroups/ (features for grouping, isolation
499 and resource control)
Paul Menageddbcc7e2007-10-18 23:39:30 -0700500
501 Say N if unsure.
502
Li Zefan23964d22009-01-15 13:50:58 -0800503if CGROUPS
504
Paul Menage006cb992007-10-18 23:39:43 -0700505config CGROUP_DEBUG
506 bool "Example debug cgroup subsystem"
507 depends on CGROUPS
Paul Menage418d7d82008-04-29 01:00:05 -0700508 default n
Paul Menage006cb992007-10-18 23:39:43 -0700509 help
510 This option enables a simple cgroup subsystem that
511 exports useful debugging information about the cgroups
Li Zefan23964d22009-01-15 13:50:58 -0800512 framework.
Paul Menage006cb992007-10-18 23:39:43 -0700513
Li Zefan23964d22009-01-15 13:50:58 -0800514 Say N if unsure.
Paul Menage006cb992007-10-18 23:39:43 -0700515
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700516config CGROUP_NS
Li Zefan23964d22009-01-15 13:50:58 -0800517 bool "Namespace cgroup subsystem"
518 depends on CGROUPS
519 help
520 Provides a simple namespace cgroup subsystem to
521 provide hierarchical naming of sets of namespaces,
522 for instance virtual servers and checkpoint/restart
523 jobs.
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700524
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700525config CGROUP_FREEZER
Li Zefan23964d22009-01-15 13:50:58 -0800526 bool "Freezer cgroup subsystem"
527 depends on CGROUPS
528 help
529 Provides a way to freeze and unfreeze all tasks in a
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700530 cgroup.
531
Serge E. Hallyn08ce5f12008-04-29 01:00:10 -0700532config CGROUP_DEVICE
533 bool "Device controller for cgroups"
534 depends on CGROUPS && EXPERIMENTAL
535 help
536 Provides a cgroup implementing whitelists for devices which
537 a process in the cgroup can mknod or open.
538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539config CPUSETS
540 bool "Cpuset support"
Paul Menagedb7f47c2009-04-02 16:57:55 -0700541 depends on CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700543 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 allow dynamically partitioning a system into sets of CPUs and
545 Memory Nodes and assigning tasks to run only within those sets.
546 This is primarily useful on large SMP or NUMA systems.
547
548 Say N if unsure.
549
Li Zefan23964d22009-01-15 13:50:58 -0800550config PROC_PID_CPUSET
551 bool "Include legacy /proc/<pid>/cpuset file"
552 depends on CPUSETS
553 default y
554
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100555config CGROUP_CPUACCT
556 bool "Simple CPU accounting cgroup subsystem"
557 depends on CGROUPS
558 help
559 Provides a simple Resource Controller for monitoring the
Li Zefan23964d22009-01-15 13:50:58 -0800560 total CPU consumed by the tasks in a cgroup.
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100561
Pavel Emelianove552b662008-02-07 00:13:49 -0800562config RESOURCE_COUNTERS
563 bool "Resource counters"
564 help
565 This option enables controller independent resource accounting
Li Zefan23964d22009-01-15 13:50:58 -0800566 infrastructure that works with cgroups.
Pavel Emelianove552b662008-02-07 00:13:49 -0800567 depends on CGROUPS
568
Balbir Singh00f0b822008-03-04 14:28:39 -0800569config CGROUP_MEM_RES_CTLR
570 bool "Memory Resource Controller for Control Groups"
571 depends on CGROUPS && RESOURCE_COUNTERS
Balbir Singhcf475ad2008-04-29 01:00:16 -0700572 select MM_OWNER
Balbir Singh00f0b822008-03-04 14:28:39 -0800573 help
KAMEZAWA Hiroyuki84ad6d72008-10-29 14:01:06 -0700574 Provides a memory resource controller that manages both anonymous
Thadeu Lima de Souza Cascardo21acb9c2009-02-04 10:12:08 +0100575 memory and page cache. (See Documentation/cgroups/memory.txt)
Balbir Singh00f0b822008-03-04 14:28:39 -0800576
577 Note that setting this option increases fixed memory overhead
KAMEZAWA Hiroyuki84ad6d72008-10-29 14:01:06 -0700578 associated with each page of memory in the system. By this,
579 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
580 usage tracking struct at boot. Total amount of this is printed out
581 at boot.
Balbir Singh00f0b822008-03-04 14:28:39 -0800582
583 Only enable when you're ok with these trade offs and really
KAMEZAWA Hiroyuki84ad6d72008-10-29 14:01:06 -0700584 sure you need the memory resource controller. Even when you enable
585 this, you can set "cgroup_disable=memory" at your boot option to
586 disable memory resource controller and you can avoid overheads.
Li Zefanc9d54092009-01-07 18:07:35 -0800587 (and lose benefits of memory resource controller)
Balbir Singh00f0b822008-03-04 14:28:39 -0800588
Balbir Singhcf475ad2008-04-29 01:00:16 -0700589 This config option also selects MM_OWNER config option, which
590 could in turn add some fork/exit overhead.
591
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800592config CGROUP_MEM_RES_CTLR_SWAP
593 bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)"
594 depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL
595 help
596 Add swap management feature to memory resource controller. When you
597 enable this, you can limit mem+swap usage per cgroup. In other words,
598 when you disable this, memory resource controller has no cares to
599 usage of swap...a process can exhaust all of the swap. This extension
600 is useful when you want to avoid exhaustion swap but this itself
601 adds more overheads and consumes memory for remembering information.
602 Especially if you use 32bit system or small memory system, please
603 be careful about enabling this. When memory resource controller
604 is disabled by boot option, this will be automatically disabled and
605 there will be no overhead from this. Even when you set this config=y,
606 if boot option "noswapaccount" is set, swap will not be accounted.
KAMEZAWA Hiroyuki627991a2009-04-02 16:57:47 -0700607 Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
608 size is 4096bytes, 512k per 1Gbytes of swap.
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800609
Li Zefan23964d22009-01-15 13:50:58 -0800610endif # CGROUPS
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800611
Li Zefan23964d22009-01-15 13:50:58 -0800612config MM_OWNER
613 bool
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800614
Kay Sievers88a22c92006-09-14 11:23:28 +0200615config SYSFS_DEPRECATED
Ingo Molnard47846c2008-03-04 14:54:47 +0100616 bool
617
618config SYSFS_DEPRECATED_V2
Kay Sieversfce3e802008-11-01 14:03:00 +0100619 bool "Create deprecated sysfs layout for older userspace tools"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800620 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200621 default y
Ingo Molnard47846c2008-03-04 14:54:47 +0100622 select SYSFS_DEPRECATED
Kay Sievers88a22c92006-09-14 11:23:28 +0200623 help
Kay Sieversfce3e802008-11-01 14:03:00 +0100624 This option switches the layout of sysfs to the deprecated
625 version.
Kay Sievers88a22c92006-09-14 11:23:28 +0200626
Kay Sieversfce3e802008-11-01 14:03:00 +0100627 The current sysfs layout features a unified device tree at
628 /sys/devices/, which is able to express a hierarchy between
629 class devices. If the deprecated option is set to Y, the
630 unified device tree is split into a bus device tree at
631 /sys/devices/ and several individual class device trees at
632 /sys/class/. The class and bus devices will be connected by
633 "<subsystem>:<name>" and the "device" links. The "block"
634 class devices, will not show up in /sys/class/block/. Some
635 subsystems will suppress the creation of some devices which
636 depend on the unified device tree.
Kay Sievers88a22c92006-09-14 11:23:28 +0200637
Kay Sieversfce3e802008-11-01 14:03:00 +0100638 This option is not a pure compatibility option that can
639 be safely enabled on newer distributions. It will change the
640 layout of sysfs to the non-extensible deprecated version,
641 and disable some features, which can not be exported without
642 confusing older userspace tools. Since 2007/2008 all major
643 distributions do not enable this option, and ship no tools which
644 depend on the deprecated layout or this option.
645
646 If you are using a new kernel on an older distribution, or use
647 older userspace tools, you might need to say Y here. Do not say Y,
648 if the original kernel, that came with your distribution, has
649 this option set to N.
Kay Sievers88a22c92006-09-14 11:23:28 +0200650
Jens Axboeb86ff9812006-03-23 19:56:55 +0100651config RELAY
652 bool "Kernel->user space relay support (formerly relayfs)"
653 help
654 This option enables support for relay interface support in
655 certain file systems (such as debugfs).
656 It is designed to provide an efficient mechanism for tools and
657 facilities to relay large amounts of data from kernel space to
658 user space.
659
660 If unsure, say N.
661
Pavel Emelyanovc5289a62008-02-08 04:18:19 -0800662config NAMESPACES
663 bool "Namespaces support" if EMBEDDED
664 default !EMBEDDED
665 help
666 Provides the way to make tasks work with different objects using
667 the same id. For example same IPC id may refer to different objects
668 or same user id or pid may refer to different tasks when used in
669 different namespaces.
670
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800671config UTS_NS
672 bool "UTS namespace"
673 depends on NAMESPACES
674 help
675 In this namespace tasks see different info provided with the
676 uname() system call
677
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800678config IPC_NS
679 bool "IPC namespace"
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700680 depends on NAMESPACES && (SYSVIPC || POSIX_MQUEUE)
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800681 help
682 In this namespace tasks work with IPC ids which correspond to
Serge E. Hallyn614b84c2009-04-06 19:01:08 -0700683 different IPC objects in different namespaces.
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800684
Pavel Emelyanovaee16ce2008-02-08 04:18:23 -0800685config USER_NS
686 bool "User namespace (EXPERIMENTAL)"
687 depends on NAMESPACES && EXPERIMENTAL
688 help
689 This allows containers, i.e. vservers, to use user namespaces
690 to provide different user info for different servers.
691 If unsure, say N.
692
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800693config PID_NS
694 bool "PID Namespaces (EXPERIMENTAL)"
695 default n
696 depends on NAMESPACES && EXPERIMENTAL
697 help
Heikki Orsila12d2b8f2008-07-06 15:48:02 +0300698 Support process id namespaces. This allows having multiple
Matt LaPlante692105b2009-01-26 11:12:25 +0100699 processes with the same pid as long as they are in different
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800700 pid namespaces. This is a building block of containers.
701
702 Unless you want to work with an experimental feature
703 say N here.
704
Matt Helsleyd6eb6332009-01-26 12:25:55 -0800705config NET_NS
706 bool "Network namespace"
707 default n
708 depends on NAMESPACES && EXPERIMENTAL && NET
709 help
710 Allow user space to create what appear to be multiple instances
711 of the network stack.
712
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800713config BLK_DEV_INITRD
714 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
715 depends on BROKEN || !FRV
716 help
717 The initial RAM filesystem is a ramfs which is loaded by the
718 boot loader (loadlin or lilo) and that is mounted as root
719 before the normal boot procedure. It is typically used to
720 load modules needed to mount the "real" root file system,
721 etc. See <file:Documentation/initrd.txt> for details.
722
723 If RAM disk support (BLK_DEV_RAM) is also included, this
724 also enables initial RAM disk (initrd) support and adds
725 15 Kbytes (more on some other architectures) to the kernel size.
726
727 If unsure say Y.
728
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800729if BLK_DEV_INITRD
730
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200731source "usr/Kconfig"
732
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800733endif
734
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800735config CC_OPTIMIZE_FOR_SIZE
Ingo Molnar96fffeb2008-04-28 01:39:43 +0200736 bool "Optimize for size"
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800737 default y
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800738 help
739 Enabling this option will pass "-Os" instead of "-O2" to gcc
740 resulting in a smaller kernel.
741
jkacur775a7222008-07-16 00:31:16 +0200742 If unsure, say Y.
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800743
Randy Dunlap08470622006-09-30 23:28:13 -0700744config SYSCTL
745 bool
746
Randy Dunlapb943c462009-03-10 12:55:46 -0700747config ANON_INODES
748 bool
749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750menuconfig EMBEDDED
751 bool "Configure standard kernel features (for small systems)"
752 help
753 This option allows certain base kernel options and settings
754 to be disabled or tweaked. This is for specialized
755 environments which can tolerate a "non-standard" kernel.
756 Only use this if you really know what you are doing.
757
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700758config UID16
759 bool "Enable 16-bit UID system calls" if EMBEDDED
David S. Miller09337f52008-04-26 03:17:12 -0700760 depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700761 default y
762 help
763 This enables the legacy 16-bit UID syscall wrappers.
764
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700765config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700766 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800767 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700768 select SYSCTL
769 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800770 sys_sysctl uses binary paths that have been found challenging
771 to properly maintain and use. The interface in /proc/sys
772 using paths with ascii names is now the primary path to this
773 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700774
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800775 Almost nothing using the binary sysctl interface so if you are
776 trying to save some space it is probably safe to disable this,
777 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700778
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800779 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100782 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 default y
784 help
785 Say Y here to let the kernel print out symbolic crash information and
786 symbolic stack backtraces. This increases the size of the kernel
787 somewhat, as all symbols have to be loaded into the kernel image.
788
789config KALLSYMS_ALL
790 bool "Include all symbols in kallsyms"
791 depends on DEBUG_KERNEL && KALLSYMS
792 help
793 Normally kallsyms only contains the symbols of functions, for nicer
794 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200795 symbols too: say Y here to include all symbols, if you need them
796 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
798 Say N.
799
800config KALLSYMS_EXTRA_PASS
801 bool "Do an extra kallsyms pass"
802 depends on KALLSYMS
803 help
804 If kallsyms is not working correctly, the build will fail with
805 inconsistent kallsyms data. If that occurs, log a bug report and
806 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
807 Always say N here unless you find a bug in kallsyms, which must be
808 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
809 you wait for kallsyms to be fixed.
810
Matt Mackalld59745c2005-05-01 08:59:02 -0700811
David Howells5d7d18f2009-03-04 11:59:07 -0800812config STRIP_ASM_SYMS
813 bool "Strip assembler-generated symbols during link"
814 default n
815 help
816 Strip internal assembler-generated symbols during a link (symbols
817 that look like '.Lxxx') so they don't pollute the output of
818 get_wchan() and suchlike.
819
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800820config HOTPLUG
821 bool "Support for hot-pluggable devices" if EMBEDDED
822 default y
823 help
824 This option is provided for the case where no hotplug or uevent
825 capabilities is wanted by the kernel. You should only consider
826 disabling this option for embedded systems that do not use modules, a
827 dynamic /dev tree, or dynamic device discovery. Just say Y.
828
Matt Mackalld59745c2005-05-01 08:59:02 -0700829config PRINTK
830 default y
831 bool "Enable support for printk" if EMBEDDED
832 help
833 This option enables normal printk support. Removing it
834 eliminates most of the message strings from the kernel image
835 and makes the kernel more or less silent. As this makes it
836 very difficult to diagnose system problems, saying N here is
837 strongly discouraged.
838
Matt Mackallc8538a72005-05-01 08:59:01 -0700839config BUG
840 bool "BUG() support" if EMBEDDED
841 default y
842 help
843 Disabling this option eliminates support for BUG and WARN, reducing
844 the size of your kernel image and potentially quietly ignoring
845 numerous fatal conditions. You should only consider disabling this
846 option for embedded systems with no facilities for reporting errors.
847 Just say Y.
848
Matt Mackall708e9a72006-01-08 01:05:25 -0800849config ELF_CORE
850 default y
851 bool "Enable ELF core dumps" if EMBEDDED
852 help
853 Enable support for generating core dumps. Disabling saves about 4k.
854
Stas Sergeeve5e1d3c2008-05-07 12:39:56 +0200855config PCSPKR_PLATFORM
856 bool "Enable PC-Speaker support" if EMBEDDED
857 depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
858 default y
859 help
860 This option allows to disable the internal PC-Speaker
861 support, saving some memory.
862
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863config BASE_FULL
864 default y
865 bool "Enable full-sized data structures for core" if EMBEDDED
866 help
867 Disabling this option reduces the size of miscellaneous core
868 kernel data structures. This saves memory on small machines,
869 but may reduce performance.
870
871config FUTEX
872 bool "Enable futex support" if EMBEDDED
873 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700874 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 help
876 Disabling this option will cause the kernel to be built without
877 support for "fast userspace mutexes". The resulting kernel may not
878 run glibc-based applications correctly.
879
880config EPOLL
881 bool "Enable eventpoll support" if EMBEDDED
882 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700883 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 help
885 Disabling this option will cause the kernel to be built without
886 support for epoll family of system calls.
887
Davide Libenzifba2afa2007-05-10 22:23:13 -0700888config SIGNALFD
889 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700890 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700891 default y
892 help
893 Enable the signalfd() system call that allows to receive signals
894 on a file descriptor.
895
896 If unsure, say Y.
897
Davide Libenzib215e282007-05-10 22:23:16 -0700898config TIMERFD
899 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700900 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700901 default y
902 help
903 Enable the timerfd() system call that allows to receive timer
904 events on a file descriptor.
905
906 If unsure, say Y.
907
Davide Libenzie1ad7462007-05-10 22:23:19 -0700908config EVENTFD
909 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700910 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700911 default y
912 help
913 Enable the eventfd() system call that allows to receive both
914 kernel notification (ie. KAIO) or userspace notifications.
915
916 If unsure, say Y.
917
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918config SHMEM
919 bool "Use full shmem filesystem" if EMBEDDED
920 default y
921 depends on MMU
922 help
923 The shmem is an internal filesystem used to manage shared memory.
924 It is backed by swap and manages resource limits. It is also exported
925 to userspace as tmpfs if TMPFS is enabled. Disabling this
926 option replaces shmem and tmpfs with the much simpler ramfs code,
927 which may be appropriate on small systems without swap.
928
Thomas Petazzoniebf3f092008-10-15 22:05:12 -0700929config AIO
930 bool "Enable AIO support" if EMBEDDED
931 default y
932 help
933 This option enables POSIX asynchronous I/O which may by used
934 by some high performance threaded applications. Disabling
935 this option saves about 7k.
936
Thomas Gleixner0793a612008-12-04 20:12:29 +0100937config HAVE_PERF_COUNTERS
938 bool
Mike Frysinger018df722009-06-12 13:17:43 -0400939 help
940 See tools/perf/design.txt for details.
Thomas Gleixner0793a612008-12-04 20:12:29 +0100941
942menu "Performance Counters"
943
944config PERF_COUNTERS
945 bool "Kernel Performance Counters"
946 depends on HAVE_PERF_COUNTERS
Ingo Molnar4c59e462008-12-08 19:38:33 +0100947 select ANON_INODES
Thomas Gleixner0793a612008-12-04 20:12:29 +0100948 help
949 Enable kernel support for performance counter hardware.
950
951 Performance counters are special hardware registers available
952 on most modern CPUs. These registers count the number of certain
953 types of hw events: such as instructions executed, cachemisses
954 suffered, or branches mis-predicted - without slowing down the
955 kernel or applications. These registers can also trigger interrupts
956 when a threshold number of events have passed - and can thus be
957 used to profile the code that runs on that CPU.
958
959 The Linux Performance Counter subsystem provides an abstraction of
960 these hardware capabilities, available via a system call. It
961 provides per task and per CPU counters, and it provides event
962 capabilities on top of those.
963
964 Say Y if unsure.
965
Peter Zijlstrae077df42009-03-19 20:26:17 +0100966config EVENT_PROFILE
967 bool "Tracepoint profile sources"
968 depends on PERF_COUNTERS && EVENT_TRACER
969 default y
970
Thomas Gleixner0793a612008-12-04 20:12:29 +0100971endmenu
972
Christoph Lameterf8891e52006-06-30 01:55:45 -0700973config VM_EVENT_COUNTERS
974 default y
975 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
976 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800977 VM event counters are needed for event counts to be shown.
978 This option allows the disabling of the VM event counters
979 on EMBEDDED systems. /proc/vmstat will only show page counts
980 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700981
Thomas Petazzoni3d137312008-08-19 10:28:24 +0200982config PCI_QUIRKS
983 default y
Geert Uytterhoeven61cfc7e2008-10-22 08:53:25 +0200984 bool "Enable PCI quirk workarounds" if EMBEDDED
985 depends on PCI
Thomas Petazzoni3d137312008-08-19 10:28:24 +0200986 help
987 This enables workarounds for various PCI chipset
988 bugs/quirks. Disable this only if your target machine is
989 unaffected by PCI quirks.
990
Christoph Lameter41ecc552007-05-09 02:32:44 -0700991config SLUB_DEBUG
992 default y
993 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterf6acb632008-04-29 16:16:06 -0700994 depends on SLUB && SYSFS
Christoph Lameter41ecc552007-05-09 02:32:44 -0700995 help
996 SLUB has extensive debug support features. Disabling these can
997 result in significant savings in code size. This also disables
998 SLUB sysfs support. /sys/slab will not exist and there will be
999 no support for cache validation etc.
1000
Randy Dunlapb943c462009-03-10 12:55:46 -07001001config COMPAT_BRK
1002 bool "Disable heap randomization"
1003 default y
1004 help
1005 Randomizing heap placement makes heap exploits harder, but it
1006 also breaks ancient binaries (including anything libc5 based).
1007 This option changes the bootup default to heap randomization
Matt LaPlante692105b2009-01-26 11:12:25 +01001008 disabled, and can be overridden at runtime by setting
Randy Dunlapb943c462009-03-10 12:55:46 -07001009 /proc/sys/kernel/randomize_va_space to 2.
1010
1011 On non-ancient distros (post-2000 ones) N is usually a safe choice.
1012
Christoph Lameter81819f02007-05-06 14:49:36 -07001013choice
1014 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -07001015 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -07001016 help
1017 This option allows to select a slab allocator.
1018
1019config SLAB
1020 bool "SLAB"
1021 help
1022 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -07001023 well in all environments. It organizes cache hot objects in
Simon Arlott02f56212008-11-05 22:18:19 +00001024 per cpu and per node queues.
Christoph Lameter81819f02007-05-06 14:49:36 -07001025
1026config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -07001027 bool "SLUB (Unqueued Allocator)"
1028 help
1029 SLUB is a slab allocator that minimizes cache line usage
1030 instead of managing queues of cached objects (SLAB approach).
1031 Per cpu caching is realized using slabs of objects instead
1032 of queues of objects. SLUB can use memory efficiently
Simon Arlott02f56212008-11-05 22:18:19 +00001033 and has enhanced diagnostics. SLUB is the default choice for
1034 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -07001035
1036config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -07001037 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -07001038 bool "SLOB (Simple Allocator)"
1039 help
Matt Mackall37291452008-02-04 22:29:38 -08001040 SLOB replaces the stock allocator with a drastically simpler
1041 allocator. SLOB is generally more space efficient but
1042 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -07001043
1044endchoice
1045
Mathieu Desnoyers125e5642008-02-02 15:10:36 -05001046config PROFILING
1047 bool "Profiling support (EXPERIMENTAL)"
1048 help
1049 Say Y here to enable the extended profiling support mechanisms used
1050 by profilers such as OProfile.
1051
Ingo Molnar5f87f112008-07-23 14:15:22 +02001052#
1053# Place an empty function call at each tracepoint site. Can be
1054# dynamically changed for a probe function.
1055#
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -04001056config TRACEPOINTS
Ingo Molnar5f87f112008-07-23 14:15:22 +02001057 bool
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -04001058
Mathieu Desnoyers125e5642008-02-02 15:10:36 -05001059config MARKERS
1060 bool "Activate markers"
Frederic Weisbecker91f73f92009-02-20 17:34:06 +01001061 select TRACEPOINTS
Mathieu Desnoyers125e5642008-02-02 15:10:36 -05001062 help
1063 Place an empty function call at each marker site. Can be
1064 dynamically changed for a probe function.
1065
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -05001066source "arch/Kconfig"
1067
David Howells07fe7cb2009-04-03 16:42:35 +01001068config SLOW_WORK
1069 default n
David Howells1c2d0082009-04-06 15:47:25 +01001070 bool
David Howells07fe7cb2009-04-03 16:42:35 +01001071 help
1072 The slow work thread pool provides a number of dynamically allocated
1073 threads that can be used by the kernel to perform operations that
1074 take a relatively long time.
1075
1076 An example of this would be CacheFiles doing a path lookup followed
1077 by a series of mkdirs and a create call, all of which have to touch
1078 disk.
1079
David Howells1c2d0082009-04-06 15:47:25 +01001080 See Documentation/slow-work.txt.
1081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082endmenu # General setup
1083
Dmitry Baryshkovee7e5512008-06-29 14:18:46 +04001084config HAVE_GENERIC_DMA_COHERENT
1085 bool
1086 default n
1087
Linus Torvalds158a9622008-01-02 13:04:48 -08001088config SLABINFO
1089 bool
1090 depends on PROC_FS
Christoph Lameter0f389ec2008-04-14 18:53:02 +03001091 depends on SLAB || SLUB_DEBUG
Linus Torvalds158a9622008-01-02 13:04:48 -08001092 default y
1093
Chuck Ebbertae81f9e2006-09-16 12:15:53 -07001094config RT_MUTEXES
1095 boolean
Chuck Ebbertae81f9e2006-09-16 12:15:53 -07001096
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097config BASE_SMALL
1098 int
1099 default 0 if BASE_FULL
1100 default 1 if !BASE_FULL
1101
Jan Engelhardt66da5732007-07-15 23:39:29 -07001102menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 bool "Enable loadable module support"
1104 help
1105 Kernel modules are small pieces of compiled code which can
1106 be inserted in the running kernel, rather than being
1107 permanently built into the kernel. You use the "modprobe"
1108 tool to add (and sometimes remove) them. If you say Y here,
1109 many parts of the kernel can be built as modules (by
1110 answering M instead of Y where indicated): this is most
1111 useful for infrequently used options which are not required
1112 for booting. For more information, see the man pages for
1113 modprobe, lsmod, modinfo, insmod and rmmod.
1114
1115 If you say Y here, you will need to run "make
1116 modules_install" to put the modules under /lib/modules/
1117 where modprobe can find them (you may need to be root to do
1118 this).
1119
1120 If unsure, say Y.
1121
Robert P. J. Day0b0de142008-08-04 13:31:32 -04001122if MODULES
1123
Linus Torvalds826e4502008-05-04 17:04:16 -07001124config MODULE_FORCE_LOAD
1125 bool "Forced module loading"
Linus Torvalds826e4502008-05-04 17:04:16 -07001126 default n
1127 help
Rusty Russell91e37a72008-05-09 16:25:28 +10001128 Allow loading of modules without version information (ie. modprobe
1129 --force). Forced module loading sets the 'F' (forced) taint flag and
1130 is usually a really bad idea.
Linus Torvalds826e4502008-05-04 17:04:16 -07001131
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132config MODULE_UNLOAD
1133 bool "Module unloading"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 help
1135 Without this option you will not be able to unload any
1136 modules (note that some modules may not be unloadable
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001137 anyway), which makes your kernel smaller, faster
1138 and simpler. If unsure, say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
1140config MODULE_FORCE_UNLOAD
1141 bool "Forced module unloading"
1142 depends on MODULE_UNLOAD && EXPERIMENTAL
1143 help
1144 This option allows you to force a module to unload, even if the
1145 kernel believes it is unsafe: the kernel will remove the module
1146 without waiting for anyone to stop using it (using the -f option to
1147 rmmod). This is mainly for kernel developers and desperate users.
1148 If unsure, say N.
1149
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +01001151 bool "Module versioning support"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 help
1153 Usually, you have to use modules compiled with your kernel.
1154 Saying Y here makes it sometimes possible to use modules
1155 compiled for different kernels, by adding enough information
1156 to the modules to (hopefully) spot any changes which would
1157 make them incompatible with the kernel you are running. If
1158 unsure, say N.
1159
1160config MODULE_SRCVERSION_ALL
1161 bool "Source checksum for all modules"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 help
1163 Modules which contain a MODULE_VERSION get an extra "srcversion"
1164 field inserted into their modinfo section, which contains a
1165 sum of the source files which made it. This helps maintainers
1166 see exactly which source was used to build a module (since
1167 others sometimes change the module source without updating
1168 the version). With this option, such a "srcversion" field
1169 will be created for all modules. If unsure, say N.
1170
Robert P. J. Day0b0de142008-08-04 13:31:32 -04001171endif # MODULES
1172
Rusty Russell98a79d62008-12-13 21:19:41 +10301173config INIT_ALL_POSSIBLE
1174 bool
1175 help
1176 Back when each arch used to define their own cpu_online_map and
1177 cpu_possible_map, some of them chose to initialize cpu_possible_map
1178 with all 1s, and others with all 0s. When they were centralised,
1179 it was better to provide this option than to break all the archs
Matt LaPlante692105b2009-01-26 11:12:25 +01001180 and have several arch maintainers pursuing me down dark alleys.
Rusty Russell98a79d62008-12-13 21:19:41 +10301181
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182config STOP_MACHINE
1183 bool
1184 default y
1185 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
1186 help
1187 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +01001188
Jens Axboe3a65dfe2005-11-04 08:43:35 +01001189source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -07001190
1191config PREEMPT_NOTIFIERS
1192 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +01001193