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80daa560 RZ |
1 | config ARCH |
2 | string | |
3 | option env="ARCH" | |
4 | ||
5 | config KERNELVERSION | |
6 | string | |
7 | option env="KERNELVERSION" | |
8 | ||
face4374 RZ |
9 | config DEFCONFIG_LIST |
10 | string | |
b2670eac | 11 | depends on !UML |
face4374 RZ |
12 | option defconfig_list |
13 | default "/lib/modules/$UNAME_RELEASE/.config" | |
14 | default "/etc/kernel-config" | |
15 | default "/boot/config-$UNAME_RELEASE" | |
73531905 | 16 | default "$ARCH_DEFCONFIG" |
face4374 RZ |
17 | default "arch/$ARCH/defconfig" |
18 | ||
b99b87f7 PO |
19 | config CONSTRUCTORS |
20 | bool | |
21 | depends on !UML | |
22 | default y | |
23 | ||
ff0cfc66 | 24 | menu "General setup" |
1da177e4 LT |
25 | |
26 | config EXPERIMENTAL | |
27 | bool "Prompt for development and/or incomplete code/drivers" | |
28 | ---help--- | |
29 | Some of the various things that Linux supports (such as network | |
30 | drivers, file systems, network protocols, etc.) can be in a state | |
31 | of development where the functionality, stability, or the level of | |
32 | testing is not yet high enough for general use. This is usually | |
33 | known as the "alpha-test" phase among developers. If a feature is | |
34 | currently in alpha-test, then the developers usually discourage | |
35 | uninformed widespread use of this feature by the general public to | |
36 | avoid "Why doesn't this work?" type mail messages. However, active | |
37 | testing and use of these systems is welcomed. Just be aware that it | |
38 | may not meet the normal level of reliability or it may fail to work | |
39 | in some special cases. Detailed bug reports from people familiar | |
40 | with the kernel internals are usually welcomed by the developers | |
41 | (before submitting bug reports, please read the documents | |
42 | <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, | |
43 | <file:Documentation/BUG-HUNTING>, and | |
44 | <file:Documentation/oops-tracing.txt> in the kernel source). | |
45 | ||
46 | This option will also make obsoleted drivers available. These are | |
47 | drivers that have been replaced by something else, and/or are | |
48 | scheduled to be removed in a future kernel release. | |
49 | ||
50 | Unless you intend to help test and develop a feature or driver that | |
51 | falls into this category, or you have a situation that requires | |
52 | using these features, you should probably say N here, which will | |
53 | cause the configurator to present you with fewer choices. If | |
54 | you say Y here, you will be offered the choice of using features or | |
55 | drivers that are currently considered to be in the alpha-test phase. | |
56 | ||
1da177e4 LT |
57 | config BROKEN |
58 | bool | |
1da177e4 LT |
59 | |
60 | config BROKEN_ON_SMP | |
61 | bool | |
62 | depends on BROKEN || !SMP | |
63 | default y | |
64 | ||
65 | config LOCK_KERNEL | |
66 | bool | |
67 | depends on SMP || PREEMPT | |
68 | default y | |
69 | ||
70 | config INIT_ENV_ARG_LIMIT | |
71 | int | |
dd673bca AB |
72 | default 32 if !UML |
73 | default 128 if UML | |
1da177e4 | 74 | help |
34ad92c2 RD |
75 | Maximum of each of the number of arguments and environment |
76 | variables passed to init from the kernel command line. | |
1da177e4 | 77 | |
1da177e4 LT |
78 | |
79 | config LOCALVERSION | |
80 | string "Local version - append to kernel release" | |
81 | help | |
82 | Append an extra string to the end of your kernel version. | |
83 | This will show up when you type uname, for example. | |
84 | The string you set here will be appended after the contents of | |
85 | any files with a filename matching localversion* in your | |
86 | object and source tree, in that order. Your total string can | |
87 | be a maximum of 64 characters. | |
88 | ||
aaebf433 RA |
89 | config LOCALVERSION_AUTO |
90 | bool "Automatically append version information to the version string" | |
91 | default y | |
92 | help | |
93 | This will try to automatically determine if the current tree is a | |
6e5a5420 RD |
94 | release tree by looking for git tags that belong to the current |
95 | top of tree revision. | |
aaebf433 RA |
96 | |
97 | A string of the format -gxxxxxxxx will be added to the localversion | |
6e5a5420 | 98 | if a git-based tree is found. The string generated by this will be |
aaebf433 | 99 | appended after any matching localversion* files, and after the value |
6e5a5420 | 100 | set in CONFIG_LOCALVERSION. |
aaebf433 | 101 | |
6e5a5420 RD |
102 | (The actual string used here is the first eight characters produced |
103 | by running the command: | |
104 | ||
105 | $ git rev-parse --verify HEAD | |
106 | ||
107 | which is done within the script "scripts/setlocalversion".) | |
aaebf433 | 108 | |
2e9f3bdd PA |
109 | config HAVE_KERNEL_GZIP |
110 | bool | |
111 | ||
112 | config HAVE_KERNEL_BZIP2 | |
113 | bool | |
114 | ||
115 | config HAVE_KERNEL_LZMA | |
116 | bool | |
117 | ||
30d65dbf | 118 | choice |
2e9f3bdd PA |
119 | prompt "Kernel compression mode" |
120 | default KERNEL_GZIP | |
121 | depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA | |
122 | help | |
30d65dbf AK |
123 | The linux kernel is a kind of self-extracting executable. |
124 | Several compression algorithms are available, which differ | |
125 | in efficiency, compression and decompression speed. | |
126 | Compression speed is only relevant when building a kernel. | |
127 | Decompression speed is relevant at each boot. | |
128 | ||
129 | If you have any problems with bzip2 or lzma compressed | |
130 | kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older | |
131 | version of this functionality (bzip2 only), for 2.4, was | |
132 | supplied by Christian Ludwig) | |
133 | ||
134 | High compression options are mostly useful for users, who | |
135 | are low on disk space (embedded systems), but for whom ram | |
136 | size matters less. | |
137 | ||
138 | If in doubt, select 'gzip' | |
139 | ||
140 | config KERNEL_GZIP | |
2e9f3bdd PA |
141 | bool "Gzip" |
142 | depends on HAVE_KERNEL_GZIP | |
143 | help | |
144 | The old and tried gzip compression. Its compression ratio is | |
145 | the poorest among the 3 choices; however its speed (both | |
146 | compression and decompression) is the fastest. | |
30d65dbf AK |
147 | |
148 | config KERNEL_BZIP2 | |
149 | bool "Bzip2" | |
2e9f3bdd | 150 | depends on HAVE_KERNEL_BZIP2 |
30d65dbf AK |
151 | help |
152 | Its compression ratio and speed is intermediate. | |
2e9f3bdd PA |
153 | Decompression speed is slowest among the three. The kernel |
154 | size is about 10% smaller with bzip2, in comparison to gzip. | |
155 | Bzip2 uses a large amount of memory. For modern kernels you | |
156 | will need at least 8MB RAM or more for booting. | |
30d65dbf AK |
157 | |
158 | config KERNEL_LZMA | |
2e9f3bdd PA |
159 | bool "LZMA" |
160 | depends on HAVE_KERNEL_LZMA | |
161 | help | |
162 | The most recent compression algorithm. | |
163 | Its ratio is best, decompression speed is between the other | |
164 | two. Compression is slowest. The kernel size is about 33% | |
165 | smaller with LZMA in comparison to gzip. | |
30d65dbf AK |
166 | |
167 | endchoice | |
168 | ||
1da177e4 LT |
169 | config SWAP |
170 | bool "Support for paging of anonymous memory (swap)" | |
9361401e | 171 | depends on MMU && BLOCK |
1da177e4 LT |
172 | default y |
173 | help | |
174 | This option allows you to choose whether you want to have support | |
92c3504e | 175 | for so called swap devices or swap files in your kernel that are |
1da177e4 LT |
176 | used to provide more virtual memory than the actual RAM present |
177 | in your computer. If unsure say Y. | |
178 | ||
179 | config SYSVIPC | |
180 | bool "System V IPC" | |
1da177e4 LT |
181 | ---help--- |
182 | Inter Process Communication is a suite of library functions and | |
183 | system calls which let processes (running programs) synchronize and | |
184 | exchange information. It is generally considered to be a good thing, | |
185 | and some programs won't run unless you say Y here. In particular, if | |
186 | you want to run the DOS emulator dosemu under Linux (read the | |
187 | DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), | |
188 | you'll need to say Y here. | |
189 | ||
190 | You can find documentation about IPC with "info ipc" and also in | |
191 | section 6.4 of the Linux Programmer's Guide, available from | |
192 | <http://www.tldp.org/guides.html>. | |
193 | ||
a5494dcd EB |
194 | config SYSVIPC_SYSCTL |
195 | bool | |
196 | depends on SYSVIPC | |
197 | depends on SYSCTL | |
198 | default y | |
199 | ||
1da177e4 LT |
200 | config POSIX_MQUEUE |
201 | bool "POSIX Message Queues" | |
202 | depends on NET && EXPERIMENTAL | |
203 | ---help--- | |
204 | POSIX variant of message queues is a part of IPC. In POSIX message | |
205 | queues every message has a priority which decides about succession | |
206 | of receiving it by a process. If you want to compile and run | |
207 | programs written e.g. for Solaris with use of its POSIX message | |
b0e37650 | 208 | queues (functions mq_*) say Y here. |
1da177e4 LT |
209 | |
210 | POSIX message queues are visible as a filesystem called 'mqueue' | |
211 | and can be mounted somewhere if you want to do filesystem | |
212 | operations on message queues. | |
213 | ||
214 | If unsure, say Y. | |
215 | ||
bdc8e5f8 SH |
216 | config POSIX_MQUEUE_SYSCTL |
217 | bool | |
218 | depends on POSIX_MQUEUE | |
219 | depends on SYSCTL | |
220 | default y | |
221 | ||
1da177e4 LT |
222 | config BSD_PROCESS_ACCT |
223 | bool "BSD Process Accounting" | |
224 | help | |
225 | If you say Y here, a user level program will be able to instruct the | |
226 | kernel (via a special system call) to write process accounting | |
227 | information to a file: whenever a process exits, information about | |
228 | that process will be appended to the file by the kernel. The | |
229 | information includes things such as creation time, owning user, | |
230 | command name, memory usage, controlling terminal etc. (the complete | |
231 | list is in the struct acct in <file:include/linux/acct.h>). It is | |
232 | up to the user level program to do useful things with this | |
233 | information. This is generally a good idea, so say Y. | |
234 | ||
235 | config BSD_PROCESS_ACCT_V3 | |
236 | bool "BSD Process Accounting version 3 file format" | |
237 | depends on BSD_PROCESS_ACCT | |
238 | default n | |
239 | help | |
240 | If you say Y here, the process accounting information is written | |
241 | in a new file format that also logs the process IDs of each | |
242 | process and it's parent. Note that this file format is incompatible | |
243 | with previous v0/v1/v2 file formats, so you will need updated tools | |
244 | for processing it. A preliminary version of these tools is available | |
37a4c940 | 245 | at <http://www.gnu.org/software/acct/>. |
1da177e4 | 246 | |
c757249a SN |
247 | config TASKSTATS |
248 | bool "Export task/process statistics through netlink (EXPERIMENTAL)" | |
249 | depends on NET | |
250 | default n | |
251 | help | |
252 | Export selected statistics for tasks/processes through the | |
253 | generic netlink interface. Unlike BSD process accounting, the | |
254 | statistics are available during the lifetime of tasks/processes as | |
255 | responses to commands. Like BSD accounting, they are sent to user | |
256 | space on task exit. | |
257 | ||
258 | Say N if unsure. | |
259 | ||
ca74e92b SN |
260 | config TASK_DELAY_ACCT |
261 | bool "Enable per-task delay accounting (EXPERIMENTAL)" | |
6f44993f | 262 | depends on TASKSTATS |
ca74e92b SN |
263 | help |
264 | Collect information on time spent by a task waiting for system | |
265 | resources like cpu, synchronous block I/O completion and swapping | |
266 | in pages. Such statistics can help in setting a task's priorities | |
267 | relative to other tasks for cpu, io, rss limits etc. | |
268 | ||
269 | Say N if unsure. | |
270 | ||
18f705f4 AD |
271 | config TASK_XACCT |
272 | bool "Enable extended accounting over taskstats (EXPERIMENTAL)" | |
273 | depends on TASKSTATS | |
274 | help | |
275 | Collect extended task accounting data and send the data | |
276 | to userland for processing over the taskstats interface. | |
277 | ||
278 | Say N if unsure. | |
279 | ||
280 | config TASK_IO_ACCOUNTING | |
281 | bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" | |
282 | depends on TASK_XACCT | |
283 | help | |
284 | Collect information on the number of bytes of storage I/O which this | |
285 | task has caused. | |
286 | ||
287 | Say N if unsure. | |
288 | ||
1da177e4 LT |
289 | config AUDIT |
290 | bool "Auditing support" | |
804a6a49 | 291 | depends on NET |
1da177e4 LT |
292 | help |
293 | Enable auditing infrastructure that can be used with another | |
294 | kernel subsystem, such as SELinux (which requires this for | |
295 | logging of avc messages output). Does not do system-call | |
296 | auditing without CONFIG_AUDITSYSCALL. | |
297 | ||
298 | config AUDITSYSCALL | |
299 | bool "Enable system-call auditing support" | |
1322b9de | 300 | depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH) |
1da177e4 LT |
301 | default y if SECURITY_SELINUX |
302 | help | |
303 | Enable low-overhead system-call auditing infrastructure that | |
304 | can be used independently or with another kernel subsystem, | |
f368c07d AG |
305 | such as SELinux. To use audit's filesystem watch feature, please |
306 | ensure that INOTIFY is configured. | |
1da177e4 | 307 | |
74c3cbe3 AV |
308 | config AUDIT_TREE |
309 | def_bool y | |
63c882a0 EP |
310 | depends on AUDITSYSCALL |
311 | select INOTIFY | |
74c3cbe3 | 312 | |
c903ff83 MT |
313 | menu "RCU Subsystem" |
314 | ||
315 | choice | |
316 | prompt "RCU Implementation" | |
31c9a24e | 317 | default TREE_RCU |
c903ff83 MT |
318 | |
319 | config CLASSIC_RCU | |
320 | bool "Classic RCU" | |
321 | help | |
322 | This option selects the classic RCU implementation that is | |
323 | designed for best read-side performance on non-realtime | |
324 | systems. | |
325 | ||
326 | Select this option if you are unsure. | |
327 | ||
328 | config TREE_RCU | |
329 | bool "Tree-based hierarchical RCU" | |
330 | help | |
331 | This option selects the RCU implementation that is | |
332 | designed for very large SMP system with hundreds or | |
333 | thousands of CPUs. | |
334 | ||
335 | config PREEMPT_RCU | |
336 | bool "Preemptible RCU" | |
337 | depends on PREEMPT | |
338 | help | |
339 | This option reduces the latency of the kernel by making certain | |
340 | RCU sections preemptible. Normally RCU code is non-preemptible, if | |
341 | this option is selected then read-only RCU sections become | |
342 | preemptible. This helps latency, but may expose bugs due to | |
343 | now-naive assumptions about each RCU read-side critical section | |
344 | remaining on a given CPU through its execution. | |
345 | ||
346 | endchoice | |
347 | ||
348 | config RCU_TRACE | |
349 | bool "Enable tracing for RCU" | |
350 | depends on TREE_RCU || PREEMPT_RCU | |
351 | help | |
352 | This option provides tracing in RCU which presents stats | |
353 | in debugfs for debugging RCU implementation. | |
354 | ||
355 | Say Y here if you want to enable RCU tracing | |
356 | Say N if you are unsure. | |
357 | ||
358 | config RCU_FANOUT | |
359 | int "Tree-based hierarchical RCU fanout value" | |
360 | range 2 64 if 64BIT | |
361 | range 2 32 if !64BIT | |
362 | depends on TREE_RCU | |
363 | default 64 if 64BIT | |
364 | default 32 if !64BIT | |
365 | help | |
366 | This option controls the fanout of hierarchical implementations | |
367 | of RCU, allowing RCU to work efficiently on machines with | |
368 | large numbers of CPUs. This value must be at least the cube | |
369 | root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit | |
370 | systems and up to 262,144 for 64-bit systems. | |
371 | ||
372 | Select a specific number if testing RCU itself. | |
373 | Take the default if unsure. | |
374 | ||
375 | config RCU_FANOUT_EXACT | |
376 | bool "Disable tree-based hierarchical RCU auto-balancing" | |
377 | depends on TREE_RCU | |
378 | default n | |
379 | help | |
380 | This option forces use of the exact RCU_FANOUT value specified, | |
381 | regardless of imbalances in the hierarchy. This is useful for | |
382 | testing RCU itself, and might one day be useful on systems with | |
383 | strong NUMA behavior. | |
384 | ||
385 | Without RCU_FANOUT_EXACT, the code will balance the hierarchy. | |
386 | ||
387 | Say N if unsure. | |
388 | ||
389 | config TREE_RCU_TRACE | |
390 | def_bool RCU_TRACE && TREE_RCU | |
391 | select DEBUG_FS | |
392 | help | |
393 | This option provides tracing for the TREE_RCU implementation, | |
394 | permitting Makefile to trivially select kernel/rcutree_trace.c. | |
395 | ||
396 | config PREEMPT_RCU_TRACE | |
397 | def_bool RCU_TRACE && PREEMPT_RCU | |
398 | select DEBUG_FS | |
399 | help | |
400 | This option provides tracing for the PREEMPT_RCU implementation, | |
401 | permitting Makefile to trivially select kernel/rcupreempt_trace.c. | |
402 | ||
403 | endmenu # "RCU Subsystem" | |
404 | ||
1da177e4 | 405 | config IKCONFIG |
f2443ab6 | 406 | tristate "Kernel .config support" |
1da177e4 LT |
407 | ---help--- |
408 | This option enables the complete Linux kernel ".config" file | |
409 | contents to be saved in the kernel. It provides documentation | |
410 | of which kernel options are used in a running kernel or in an | |
411 | on-disk kernel. This information can be extracted from the kernel | |
412 | image file with the script scripts/extract-ikconfig and used as | |
413 | input to rebuild the current kernel or to build another kernel. | |
414 | It can also be extracted from a running kernel by reading | |
415 | /proc/config.gz if enabled (below). | |
416 | ||
417 | config IKCONFIG_PROC | |
418 | bool "Enable access to .config through /proc/config.gz" | |
419 | depends on IKCONFIG && PROC_FS | |
420 | ---help--- | |
421 | This option enables access to the kernel configuration file | |
422 | through /proc/config.gz. | |
423 | ||
794543a2 AJS |
424 | config LOG_BUF_SHIFT |
425 | int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" | |
426 | range 12 21 | |
f17a32e9 | 427 | default 17 |
794543a2 AJS |
428 | help |
429 | Select kernel log buffer size as a power of 2. | |
f17a32e9 AB |
430 | Examples: |
431 | 17 => 128 KB | |
432 | 16 => 64 KB | |
433 | 15 => 32 KB | |
434 | 14 => 16 KB | |
794543a2 AJS |
435 | 13 => 8 KB |
436 | 12 => 4 KB | |
437 | ||
a5574cf6 IM |
438 | # |
439 | # Architectures with an unreliable sched_clock() should select this: | |
440 | # | |
441 | config HAVE_UNSTABLE_SCHED_CLOCK | |
442 | bool | |
443 | ||
052f1dc7 PZ |
444 | config GROUP_SCHED |
445 | bool "Group CPU scheduler" | |
aac6abca PW |
446 | depends on EXPERIMENTAL |
447 | default n | |
29f59db3 | 448 | help |
fb615581 | 449 | This feature lets CPU scheduler recognize task groups and control CPU |
9b5b7751 | 450 | bandwidth allocation to such task groups. |
5cdc38f9 KH |
451 | In order to create a group from arbitrary set of processes, use |
452 | CONFIG_CGROUPS. (See Control Group support.) | |
29f59db3 | 453 | |
052f1dc7 PZ |
454 | config FAIR_GROUP_SCHED |
455 | bool "Group scheduling for SCHED_OTHER" | |
456 | depends on GROUP_SCHED | |
aac6abca | 457 | default GROUP_SCHED |
052f1dc7 PZ |
458 | |
459 | config RT_GROUP_SCHED | |
460 | bool "Group scheduling for SCHED_RR/FIFO" | |
461 | depends on EXPERIMENTAL | |
462 | depends on GROUP_SCHED | |
463 | default n | |
b9b158fe VR |
464 | help |
465 | This feature lets you explicitly allocate real CPU bandwidth | |
466 | to users or control groups (depending on the "Basis for grouping tasks" | |
467 | setting below. If enabled, it will also make it impossible to | |
468 | schedule realtime tasks for non-root users until you allocate | |
469 | realtime bandwidth for them. | |
2fe401e3 | 470 | See Documentation/scheduler/sched-rt-group.txt for more information. |
052f1dc7 | 471 | |
24e377a8 | 472 | choice |
052f1dc7 | 473 | depends on GROUP_SCHED |
24e377a8 | 474 | prompt "Basis for grouping tasks" |
052f1dc7 | 475 | default USER_SCHED |
24e377a8 | 476 | |
052f1dc7 | 477 | config USER_SCHED |
fb615581 SV |
478 | bool "user id" |
479 | help | |
480 | This option will choose userid as the basis for grouping | |
481 | tasks, thus providing equal CPU bandwidth to each user. | |
24e377a8 | 482 | |
052f1dc7 | 483 | config CGROUP_SCHED |
68318b8e SV |
484 | bool "Control groups" |
485 | depends on CGROUPS | |
486 | help | |
487 | This option allows you to create arbitrary task groups | |
488 | using the "cgroup" pseudo filesystem and control | |
489 | the cpu bandwidth allocated to each such task group. | |
45ce80fb LZ |
490 | Refer to Documentation/cgroups/cgroups.txt for more |
491 | information on "cgroup" pseudo filesystem. | |
68318b8e | 492 | |
24e377a8 SV |
493 | endchoice |
494 | ||
23964d2d LZ |
495 | menuconfig CGROUPS |
496 | boolean "Control Group support" | |
5cdc38f9 | 497 | help |
23964d2d | 498 | This option adds support for grouping sets of processes together, for |
5cdc38f9 KH |
499 | use with process control subsystems such as Cpusets, CFS, memory |
500 | controls or device isolation. | |
501 | See | |
5cdc38f9 | 502 | - Documentation/scheduler/sched-design-CFS.txt (CFS) |
45ce80fb LZ |
503 | - Documentation/cgroups/ (features for grouping, isolation |
504 | and resource control) | |
5cdc38f9 KH |
505 | |
506 | Say N if unsure. | |
507 | ||
23964d2d LZ |
508 | if CGROUPS |
509 | ||
5cdc38f9 KH |
510 | config CGROUP_DEBUG |
511 | bool "Example debug cgroup subsystem" | |
512 | depends on CGROUPS | |
513 | default n | |
514 | help | |
515 | This option enables a simple cgroup subsystem that | |
516 | exports useful debugging information about the cgroups | |
23964d2d | 517 | framework. |
5cdc38f9 | 518 | |
23964d2d | 519 | Say N if unsure. |
5cdc38f9 KH |
520 | |
521 | config CGROUP_NS | |
23964d2d LZ |
522 | bool "Namespace cgroup subsystem" |
523 | depends on CGROUPS | |
524 | help | |
525 | Provides a simple namespace cgroup subsystem to | |
526 | provide hierarchical naming of sets of namespaces, | |
527 | for instance virtual servers and checkpoint/restart | |
528 | jobs. | |
5cdc38f9 KH |
529 | |
530 | config CGROUP_FREEZER | |
23964d2d LZ |
531 | bool "Freezer cgroup subsystem" |
532 | depends on CGROUPS | |
533 | help | |
534 | Provides a way to freeze and unfreeze all tasks in a | |
5cdc38f9 KH |
535 | cgroup. |
536 | ||
537 | config CGROUP_DEVICE | |
538 | bool "Device controller for cgroups" | |
539 | depends on CGROUPS && EXPERIMENTAL | |
540 | help | |
541 | Provides a cgroup implementing whitelists for devices which | |
542 | a process in the cgroup can mknod or open. | |
543 | ||
544 | config CPUSETS | |
545 | bool "Cpuset support" | |
db7f47cf | 546 | depends on CGROUPS |
5cdc38f9 KH |
547 | help |
548 | This option will let you create and manage CPUSETs which | |
549 | allow dynamically partitioning a system into sets of CPUs and | |
550 | Memory Nodes and assigning tasks to run only within those sets. | |
551 | This is primarily useful on large SMP or NUMA systems. | |
552 | ||
553 | Say N if unsure. | |
554 | ||
23964d2d LZ |
555 | config PROC_PID_CPUSET |
556 | bool "Include legacy /proc/<pid>/cpuset file" | |
557 | depends on CPUSETS | |
558 | default y | |
559 | ||
d842de87 SV |
560 | config CGROUP_CPUACCT |
561 | bool "Simple CPU accounting cgroup subsystem" | |
562 | depends on CGROUPS | |
563 | help | |
564 | Provides a simple Resource Controller for monitoring the | |
23964d2d | 565 | total CPU consumed by the tasks in a cgroup. |
d842de87 | 566 | |
e552b661 PE |
567 | config RESOURCE_COUNTERS |
568 | bool "Resource counters" | |
569 | help | |
570 | This option enables controller independent resource accounting | |
23964d2d | 571 | infrastructure that works with cgroups. |
e552b661 PE |
572 | depends on CGROUPS |
573 | ||
00f0b825 BS |
574 | config CGROUP_MEM_RES_CTLR |
575 | bool "Memory Resource Controller for Control Groups" | |
576 | depends on CGROUPS && RESOURCE_COUNTERS | |
cf475ad2 | 577 | select MM_OWNER |
00f0b825 | 578 | help |
84ad6d70 | 579 | Provides a memory resource controller that manages both anonymous |
21acb9ca | 580 | memory and page cache. (See Documentation/cgroups/memory.txt) |
00f0b825 BS |
581 | |
582 | Note that setting this option increases fixed memory overhead | |
84ad6d70 KH |
583 | associated with each page of memory in the system. By this, |
584 | 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory | |
585 | usage tracking struct at boot. Total amount of this is printed out | |
586 | at boot. | |
00f0b825 BS |
587 | |
588 | Only enable when you're ok with these trade offs and really | |
84ad6d70 KH |
589 | sure you need the memory resource controller. Even when you enable |
590 | this, you can set "cgroup_disable=memory" at your boot option to | |
591 | disable memory resource controller and you can avoid overheads. | |
c9d5409f | 592 | (and lose benefits of memory resource controller) |
00f0b825 | 593 | |
cf475ad2 BS |
594 | This config option also selects MM_OWNER config option, which |
595 | could in turn add some fork/exit overhead. | |
596 | ||
c077719b KH |
597 | config CGROUP_MEM_RES_CTLR_SWAP |
598 | bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)" | |
599 | depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL | |
600 | help | |
601 | Add swap management feature to memory resource controller. When you | |
602 | enable this, you can limit mem+swap usage per cgroup. In other words, | |
603 | when you disable this, memory resource controller has no cares to | |
604 | usage of swap...a process can exhaust all of the swap. This extension | |
605 | is useful when you want to avoid exhaustion swap but this itself | |
606 | adds more overheads and consumes memory for remembering information. | |
607 | Especially if you use 32bit system or small memory system, please | |
608 | be careful about enabling this. When memory resource controller | |
609 | is disabled by boot option, this will be automatically disabled and | |
610 | there will be no overhead from this. Even when you set this config=y, | |
611 | if boot option "noswapaccount" is set, swap will not be accounted. | |
627991a2 KH |
612 | Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page |
613 | size is 4096bytes, 512k per 1Gbytes of swap. | |
c077719b | 614 | |
23964d2d | 615 | endif # CGROUPS |
c077719b | 616 | |
23964d2d LZ |
617 | config MM_OWNER |
618 | bool | |
5cdc38f9 | 619 | |
88a22c98 | 620 | config SYSFS_DEPRECATED |
d47846c5 IM |
621 | bool |
622 | ||
623 | config SYSFS_DEPRECATED_V2 | |
f6ee649f | 624 | bool "remove sysfs features which may confuse old userspace tools" |
9148fe87 | 625 | depends on SYSFS |
f6ee649f | 626 | default n |
d47846c5 | 627 | select SYSFS_DEPRECATED |
88a22c98 | 628 | help |
fce3e804 | 629 | This option switches the layout of sysfs to the deprecated |
f6ee649f | 630 | version. Do not use it on recent distributions. |
fce3e804 KS |
631 | |
632 | The current sysfs layout features a unified device tree at | |
633 | /sys/devices/, which is able to express a hierarchy between | |
634 | class devices. If the deprecated option is set to Y, the | |
635 | unified device tree is split into a bus device tree at | |
636 | /sys/devices/ and several individual class device trees at | |
637 | /sys/class/. The class and bus devices will be connected by | |
638 | "<subsystem>:<name>" and the "device" links. The "block" | |
639 | class devices, will not show up in /sys/class/block/. Some | |
640 | subsystems will suppress the creation of some devices which | |
641 | depend on the unified device tree. | |
642 | ||
643 | This option is not a pure compatibility option that can | |
644 | be safely enabled on newer distributions. It will change the | |
645 | layout of sysfs to the non-extensible deprecated version, | |
646 | and disable some features, which can not be exported without | |
647 | confusing older userspace tools. Since 2007/2008 all major | |
648 | distributions do not enable this option, and ship no tools which | |
649 | depend on the deprecated layout or this option. | |
650 | ||
651 | If you are using a new kernel on an older distribution, or use | |
652 | older userspace tools, you might need to say Y here. Do not say Y, | |
653 | if the original kernel, that came with your distribution, has | |
654 | this option set to N. | |
88a22c98 | 655 | |
b86ff981 JA |
656 | config RELAY |
657 | bool "Kernel->user space relay support (formerly relayfs)" | |
658 | help | |
659 | This option enables support for relay interface support in | |
660 | certain file systems (such as debugfs). | |
661 | It is designed to provide an efficient mechanism for tools and | |
662 | facilities to relay large amounts of data from kernel space to | |
663 | user space. | |
664 | ||
665 | If unsure, say N. | |
666 | ||
c5289a69 PE |
667 | config NAMESPACES |
668 | bool "Namespaces support" if EMBEDDED | |
669 | default !EMBEDDED | |
670 | help | |
671 | Provides the way to make tasks work with different objects using | |
672 | the same id. For example same IPC id may refer to different objects | |
673 | or same user id or pid may refer to different tasks when used in | |
674 | different namespaces. | |
675 | ||
58bfdd6d PE |
676 | config UTS_NS |
677 | bool "UTS namespace" | |
678 | depends on NAMESPACES | |
679 | help | |
680 | In this namespace tasks see different info provided with the | |
681 | uname() system call | |
682 | ||
ae5e1b22 PE |
683 | config IPC_NS |
684 | bool "IPC namespace" | |
614b84cf | 685 | depends on NAMESPACES && (SYSVIPC || POSIX_MQUEUE) |
ae5e1b22 PE |
686 | help |
687 | In this namespace tasks work with IPC ids which correspond to | |
614b84cf | 688 | different IPC objects in different namespaces. |
ae5e1b22 | 689 | |
aee16ce7 PE |
690 | config USER_NS |
691 | bool "User namespace (EXPERIMENTAL)" | |
692 | depends on NAMESPACES && EXPERIMENTAL | |
693 | help | |
694 | This allows containers, i.e. vservers, to use user namespaces | |
695 | to provide different user info for different servers. | |
696 | If unsure, say N. | |
697 | ||
74bd59bb PE |
698 | config PID_NS |
699 | bool "PID Namespaces (EXPERIMENTAL)" | |
700 | default n | |
701 | depends on NAMESPACES && EXPERIMENTAL | |
702 | help | |
12d2b8f9 | 703 | Support process id namespaces. This allows having multiple |
692105b8 | 704 | processes with the same pid as long as they are in different |
74bd59bb PE |
705 | pid namespaces. This is a building block of containers. |
706 | ||
707 | Unless you want to work with an experimental feature | |
708 | say N here. | |
709 | ||
d6eb633f MH |
710 | config NET_NS |
711 | bool "Network namespace" | |
712 | default n | |
713 | depends on NAMESPACES && EXPERIMENTAL && NET | |
714 | help | |
715 | Allow user space to create what appear to be multiple instances | |
716 | of the network stack. | |
717 | ||
f991633d DG |
718 | config BLK_DEV_INITRD |
719 | bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" | |
720 | depends on BROKEN || !FRV | |
721 | help | |
722 | The initial RAM filesystem is a ramfs which is loaded by the | |
723 | boot loader (loadlin or lilo) and that is mounted as root | |
724 | before the normal boot procedure. It is typically used to | |
725 | load modules needed to mount the "real" root file system, | |
726 | etc. See <file:Documentation/initrd.txt> for details. | |
727 | ||
728 | If RAM disk support (BLK_DEV_RAM) is also included, this | |
729 | also enables initial RAM disk (initrd) support and adds | |
730 | 15 Kbytes (more on some other architectures) to the kernel size. | |
731 | ||
732 | If unsure say Y. | |
733 | ||
c33df4ea JPS |
734 | if BLK_DEV_INITRD |
735 | ||
dbec4866 SR |
736 | source "usr/Kconfig" |
737 | ||
c33df4ea JPS |
738 | endif |
739 | ||
c45b4f1f | 740 | config CC_OPTIMIZE_FOR_SIZE |
96fffeb4 | 741 | bool "Optimize for size" |
c45b4f1f | 742 | default y |
c45b4f1f LT |
743 | help |
744 | Enabling this option will pass "-Os" instead of "-O2" to gcc | |
745 | resulting in a smaller kernel. | |
746 | ||
775a7229 | 747 | If unsure, say Y. |
c45b4f1f | 748 | |
0847062a RD |
749 | config SYSCTL |
750 | bool | |
751 | ||
b943c460 RD |
752 | config ANON_INODES |
753 | bool | |
754 | ||
1da177e4 LT |
755 | menuconfig EMBEDDED |
756 | bool "Configure standard kernel features (for small systems)" | |
757 | help | |
758 | This option allows certain base kernel options and settings | |
759 | to be disabled or tweaked. This is for specialized | |
760 | environments which can tolerate a "non-standard" kernel. | |
761 | Only use this if you really know what you are doing. | |
762 | ||
ae81f9e3 CE |
763 | config UID16 |
764 | bool "Enable 16-bit UID system calls" if EMBEDDED | |
09337f50 | 765 | depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) |
ae81f9e3 CE |
766 | default y |
767 | help | |
768 | This enables the legacy 16-bit UID syscall wrappers. | |
769 | ||
b89a8171 | 770 | config SYSCTL_SYSCALL |
0847062a | 771 | bool "Sysctl syscall support" if EMBEDDED |
13bb7e37 | 772 | default y |
b89a8171 | 773 | select SYSCTL |
ae81f9e3 | 774 | ---help--- |
13bb7e37 EB |
775 | sys_sysctl uses binary paths that have been found challenging |
776 | to properly maintain and use. The interface in /proc/sys | |
777 | using paths with ascii names is now the primary path to this | |
778 | information. | |
b89a8171 | 779 | |
13bb7e37 EB |
780 | Almost nothing using the binary sysctl interface so if you are |
781 | trying to save some space it is probably safe to disable this, | |
782 | making your kernel marginally smaller. | |
b89a8171 | 783 | |
13bb7e37 | 784 | If unsure say Y here. |
ae81f9e3 | 785 | |
1da177e4 | 786 | config KALLSYMS |
979c6a1e | 787 | bool "Load all symbols for debugging/ksymoops" if EMBEDDED |
1da177e4 LT |
788 | default y |
789 | help | |
790 | Say Y here to let the kernel print out symbolic crash information and | |
791 | symbolic stack backtraces. This increases the size of the kernel | |
792 | somewhat, as all symbols have to be loaded into the kernel image. | |
793 | ||
794 | config KALLSYMS_ALL | |
795 | bool "Include all symbols in kallsyms" | |
796 | depends on DEBUG_KERNEL && KALLSYMS | |
797 | help | |
798 | Normally kallsyms only contains the symbols of functions, for nicer | |
799 | OOPS messages. Some debuggers can use kallsyms for other | |
f9f97bc0 JJ |
800 | symbols too: say Y here to include all symbols, if you need them |
801 | and you don't care about adding 300k to the size of your kernel. | |
1da177e4 LT |
802 | |
803 | Say N. | |
804 | ||
805 | config KALLSYMS_EXTRA_PASS | |
806 | bool "Do an extra kallsyms pass" | |
807 | depends on KALLSYMS | |
808 | help | |
809 | If kallsyms is not working correctly, the build will fail with | |
810 | inconsistent kallsyms data. If that occurs, log a bug report and | |
811 | turn on KALLSYMS_EXTRA_PASS which should result in a stable build. | |
812 | Always say N here unless you find a bug in kallsyms, which must be | |
813 | reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while | |
814 | you wait for kallsyms to be fixed. | |
815 | ||
d59745ce | 816 | |
712f47ce GKH |
817 | config HOTPLUG |
818 | bool "Support for hot-pluggable devices" if EMBEDDED | |
819 | default y | |
820 | help | |
821 | This option is provided for the case where no hotplug or uevent | |
822 | capabilities is wanted by the kernel. You should only consider | |
823 | disabling this option for embedded systems that do not use modules, a | |
824 | dynamic /dev tree, or dynamic device discovery. Just say Y. | |
825 | ||
d59745ce MM |
826 | config PRINTK |
827 | default y | |
828 | bool "Enable support for printk" if EMBEDDED | |
829 | help | |
830 | This option enables normal printk support. Removing it | |
831 | eliminates most of the message strings from the kernel image | |
832 | and makes the kernel more or less silent. As this makes it | |
833 | very difficult to diagnose system problems, saying N here is | |
834 | strongly discouraged. | |
835 | ||
c8538a7a MM |
836 | config BUG |
837 | bool "BUG() support" if EMBEDDED | |
838 | default y | |
839 | help | |
840 | Disabling this option eliminates support for BUG and WARN, reducing | |
841 | the size of your kernel image and potentially quietly ignoring | |
842 | numerous fatal conditions. You should only consider disabling this | |
843 | option for embedded systems with no facilities for reporting errors. | |
844 | Just say Y. | |
845 | ||
708e9a79 MM |
846 | config ELF_CORE |
847 | default y | |
848 | bool "Enable ELF core dumps" if EMBEDDED | |
849 | help | |
850 | Enable support for generating core dumps. Disabling saves about 4k. | |
851 | ||
e5e1d3cb SS |
852 | config PCSPKR_PLATFORM |
853 | bool "Enable PC-Speaker support" if EMBEDDED | |
854 | depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES | |
855 | default y | |
856 | help | |
857 | This option allows to disable the internal PC-Speaker | |
858 | support, saving some memory. | |
859 | ||
1da177e4 LT |
860 | config BASE_FULL |
861 | default y | |
862 | bool "Enable full-sized data structures for core" if EMBEDDED | |
863 | help | |
864 | Disabling this option reduces the size of miscellaneous core | |
865 | kernel data structures. This saves memory on small machines, | |
866 | but may reduce performance. | |
867 | ||
868 | config FUTEX | |
869 | bool "Enable futex support" if EMBEDDED | |
870 | default y | |
23f78d4a | 871 | select RT_MUTEXES |
1da177e4 LT |
872 | help |
873 | Disabling this option will cause the kernel to be built without | |
874 | support for "fast userspace mutexes". The resulting kernel may not | |
875 | run glibc-based applications correctly. | |
876 | ||
877 | config EPOLL | |
878 | bool "Enable eventpoll support" if EMBEDDED | |
879 | default y | |
448e3cee | 880 | select ANON_INODES |
1da177e4 LT |
881 | help |
882 | Disabling this option will cause the kernel to be built without | |
883 | support for epoll family of system calls. | |
884 | ||
fba2afaa DL |
885 | config SIGNALFD |
886 | bool "Enable signalfd() system call" if EMBEDDED | |
448e3cee | 887 | select ANON_INODES |
fba2afaa DL |
888 | default y |
889 | help | |
890 | Enable the signalfd() system call that allows to receive signals | |
891 | on a file descriptor. | |
892 | ||
893 | If unsure, say Y. | |
894 | ||
b215e283 DL |
895 | config TIMERFD |
896 | bool "Enable timerfd() system call" if EMBEDDED | |
448e3cee | 897 | select ANON_INODES |
b215e283 DL |
898 | default y |
899 | help | |
900 | Enable the timerfd() system call that allows to receive timer | |
901 | events on a file descriptor. | |
902 | ||
903 | If unsure, say Y. | |
904 | ||
e1ad7468 DL |
905 | config EVENTFD |
906 | bool "Enable eventfd() system call" if EMBEDDED | |
448e3cee | 907 | select ANON_INODES |
e1ad7468 DL |
908 | default y |
909 | help | |
910 | Enable the eventfd() system call that allows to receive both | |
911 | kernel notification (ie. KAIO) or userspace notifications. | |
912 | ||
913 | If unsure, say Y. | |
914 | ||
1da177e4 LT |
915 | config SHMEM |
916 | bool "Use full shmem filesystem" if EMBEDDED | |
917 | default y | |
918 | depends on MMU | |
919 | help | |
920 | The shmem is an internal filesystem used to manage shared memory. | |
921 | It is backed by swap and manages resource limits. It is also exported | |
922 | to userspace as tmpfs if TMPFS is enabled. Disabling this | |
923 | option replaces shmem and tmpfs with the much simpler ramfs code, | |
924 | which may be appropriate on small systems without swap. | |
925 | ||
ebf3f09c TP |
926 | config AIO |
927 | bool "Enable AIO support" if EMBEDDED | |
928 | default y | |
929 | help | |
930 | This option enables POSIX asynchronous I/O which may by used | |
931 | by some high performance threaded applications. Disabling | |
932 | this option saves about 7k. | |
933 | ||
0793a61d TG |
934 | config HAVE_PERF_COUNTERS |
935 | bool | |
018df72d MF |
936 | help |
937 | See tools/perf/design.txt for details. | |
0793a61d TG |
938 | |
939 | menu "Performance Counters" | |
940 | ||
941 | config PERF_COUNTERS | |
942 | bool "Kernel Performance Counters" | |
f2654260 | 943 | default y if PROFILING |
0793a61d | 944 | depends on HAVE_PERF_COUNTERS |
4c59e467 | 945 | select ANON_INODES |
0793a61d TG |
946 | help |
947 | Enable kernel support for performance counter hardware. | |
948 | ||
949 | Performance counters are special hardware registers available | |
950 | on most modern CPUs. These registers count the number of certain | |
951 | types of hw events: such as instructions executed, cachemisses | |
952 | suffered, or branches mis-predicted - without slowing down the | |
953 | kernel or applications. These registers can also trigger interrupts | |
954 | when a threshold number of events have passed - and can thus be | |
955 | used to profile the code that runs on that CPU. | |
956 | ||
957 | The Linux Performance Counter subsystem provides an abstraction of | |
958 | these hardware capabilities, available via a system call. It | |
959 | provides per task and per CPU counters, and it provides event | |
960 | capabilities on top of those. | |
961 | ||
962 | Say Y if unsure. | |
963 | ||
e077df4f | 964 | config EVENT_PROFILE |
470a1396 | 965 | bool "Tracepoint profiling sources" |
d4d7d0b9 | 966 | depends on PERF_COUNTERS && EVENT_TRACING |
e077df4f | 967 | default y |
470a1396 PZ |
968 | help |
969 | Allow the use of tracepoints as software performance counters. | |
970 | ||
971 | When this is enabled, you can create perf counters based on | |
972 | tracepoints using PERF_TYPE_TRACEPOINT and the tracepoint ID | |
973 | found in debugfs://tracing/events/*/*/id. (The -e/--events | |
974 | option to the perf tool can parse and interpret symbolic | |
975 | tracepoints, in the subsystem:tracepoint_name format.) | |
e077df4f | 976 | |
0793a61d TG |
977 | endmenu |
978 | ||
f8891e5e CL |
979 | config VM_EVENT_COUNTERS |
980 | default y | |
981 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED | |
982 | help | |
2aea4fb6 PJ |
983 | VM event counters are needed for event counts to be shown. |
984 | This option allows the disabling of the VM event counters | |
985 | on EMBEDDED systems. /proc/vmstat will only show page counts | |
986 | if VM event counters are disabled. | |
f8891e5e | 987 | |
3d137310 TP |
988 | config PCI_QUIRKS |
989 | default y | |
61cfc7e4 GU |
990 | bool "Enable PCI quirk workarounds" if EMBEDDED |
991 | depends on PCI | |
3d137310 TP |
992 | help |
993 | This enables workarounds for various PCI chipset | |
994 | bugs/quirks. Disable this only if your target machine is | |
995 | unaffected by PCI quirks. | |
996 | ||
41ecc55b CL |
997 | config SLUB_DEBUG |
998 | default y | |
999 | bool "Enable SLUB debugging support" if EMBEDDED | |
f6acb635 | 1000 | depends on SLUB && SYSFS |
41ecc55b CL |
1001 | help |
1002 | SLUB has extensive debug support features. Disabling these can | |
1003 | result in significant savings in code size. This also disables | |
1004 | SLUB sysfs support. /sys/slab will not exist and there will be | |
1005 | no support for cache validation etc. | |
1006 | ||
a9eb5223 RD |
1007 | config STRIP_ASM_SYMS |
1008 | bool "Strip assembler-generated symbols during link" | |
1009 | default n | |
1010 | help | |
1011 | Strip internal assembler-generated symbols during a link (symbols | |
1012 | that look like '.Lxxx') so they don't pollute the output of | |
1013 | get_wchan() and suchlike. | |
1014 | ||
b943c460 RD |
1015 | config COMPAT_BRK |
1016 | bool "Disable heap randomization" | |
1017 | default y | |
1018 | help | |
1019 | Randomizing heap placement makes heap exploits harder, but it | |
1020 | also breaks ancient binaries (including anything libc5 based). | |
1021 | This option changes the bootup default to heap randomization | |
692105b8 | 1022 | disabled, and can be overridden at runtime by setting |
b943c460 RD |
1023 | /proc/sys/kernel/randomize_va_space to 2. |
1024 | ||
1025 | On non-ancient distros (post-2000 ones) N is usually a safe choice. | |
1026 | ||
81819f0f CL |
1027 | choice |
1028 | prompt "Choose SLAB allocator" | |
a0acd820 | 1029 | default SLUB |
81819f0f CL |
1030 | help |
1031 | This option allows to select a slab allocator. | |
1032 | ||
1033 | config SLAB | |
1034 | bool "SLAB" | |
1035 | help | |
1036 | The regular slab allocator that is established and known to work | |
34013886 | 1037 | well in all environments. It organizes cache hot objects in |
02f56210 | 1038 | per cpu and per node queues. |
81819f0f CL |
1039 | |
1040 | config SLUB | |
81819f0f CL |
1041 | bool "SLUB (Unqueued Allocator)" |
1042 | help | |
1043 | SLUB is a slab allocator that minimizes cache line usage | |
1044 | instead of managing queues of cached objects (SLAB approach). | |
1045 | Per cpu caching is realized using slabs of objects instead | |
1046 | of queues of objects. SLUB can use memory efficiently | |
02f56210 SA |
1047 | and has enhanced diagnostics. SLUB is the default choice for |
1048 | a slab allocator. | |
81819f0f CL |
1049 | |
1050 | config SLOB | |
84a01c2f | 1051 | depends on EMBEDDED |
81819f0f CL |
1052 | bool "SLOB (Simple Allocator)" |
1053 | help | |
37291458 MM |
1054 | SLOB replaces the stock allocator with a drastically simpler |
1055 | allocator. SLOB is generally more space efficient but | |
1056 | does not perform as well on large systems. | |
81819f0f CL |
1057 | |
1058 | endchoice | |
1059 | ||
125e5645 MD |
1060 | config PROFILING |
1061 | bool "Profiling support (EXPERIMENTAL)" | |
1062 | help | |
1063 | Say Y here to enable the extended profiling support mechanisms used | |
1064 | by profilers such as OProfile. | |
1065 | ||
5f87f112 IM |
1066 | # |
1067 | # Place an empty function call at each tracepoint site. Can be | |
1068 | # dynamically changed for a probe function. | |
1069 | # | |
97e1c18e | 1070 | config TRACEPOINTS |
5f87f112 | 1071 | bool |
97e1c18e | 1072 | |
125e5645 MD |
1073 | config MARKERS |
1074 | bool "Activate markers" | |
91f73f90 | 1075 | select TRACEPOINTS |
125e5645 MD |
1076 | help |
1077 | Place an empty function call at each marker site. Can be | |
1078 | dynamically changed for a probe function. | |
1079 | ||
fb32e03f MD |
1080 | source "arch/Kconfig" |
1081 | ||
07fe7cb7 DH |
1082 | config SLOW_WORK |
1083 | default n | |
1c2d008c | 1084 | bool |
07fe7cb7 DH |
1085 | help |
1086 | The slow work thread pool provides a number of dynamically allocated | |
1087 | threads that can be used by the kernel to perform operations that | |
1088 | take a relatively long time. | |
1089 | ||
1090 | An example of this would be CacheFiles doing a path lookup followed | |
1091 | by a series of mkdirs and a create call, all of which have to touch | |
1092 | disk. | |
1093 | ||
1c2d008c DH |
1094 | See Documentation/slow-work.txt. |
1095 | ||
1da177e4 LT |
1096 | endmenu # General setup |
1097 | ||
ee7e5516 DB |
1098 | config HAVE_GENERIC_DMA_COHERENT |
1099 | bool | |
1100 | default n | |
1101 | ||
158a9624 LT |
1102 | config SLABINFO |
1103 | bool | |
1104 | depends on PROC_FS | |
0f389ec6 | 1105 | depends on SLAB || SLUB_DEBUG |
158a9624 LT |
1106 | default y |
1107 | ||
ae81f9e3 CE |
1108 | config RT_MUTEXES |
1109 | boolean | |
ae81f9e3 | 1110 | |
1da177e4 LT |
1111 | config BASE_SMALL |
1112 | int | |
1113 | default 0 if BASE_FULL | |
1114 | default 1 if !BASE_FULL | |
1115 | ||
66da5733 | 1116 | menuconfig MODULES |
1da177e4 LT |
1117 | bool "Enable loadable module support" |
1118 | help | |
1119 | Kernel modules are small pieces of compiled code which can | |
1120 | be inserted in the running kernel, rather than being | |
1121 | permanently built into the kernel. You use the "modprobe" | |
1122 | tool to add (and sometimes remove) them. If you say Y here, | |
1123 | many parts of the kernel can be built as modules (by | |
1124 | answering M instead of Y where indicated): this is most | |
1125 | useful for infrequently used options which are not required | |
1126 | for booting. For more information, see the man pages for | |
1127 | modprobe, lsmod, modinfo, insmod and rmmod. | |
1128 | ||
1129 | If you say Y here, you will need to run "make | |
1130 | modules_install" to put the modules under /lib/modules/ | |
1131 | where modprobe can find them (you may need to be root to do | |
1132 | this). | |
1133 | ||
1134 | If unsure, say Y. | |
1135 | ||
0b0de144 RD |
1136 | if MODULES |
1137 | ||
826e4506 LT |
1138 | config MODULE_FORCE_LOAD |
1139 | bool "Forced module loading" | |
826e4506 LT |
1140 | default n |
1141 | help | |
91e37a79 RR |
1142 | Allow loading of modules without version information (ie. modprobe |
1143 | --force). Forced module loading sets the 'F' (forced) taint flag and | |
1144 | is usually a really bad idea. | |
826e4506 | 1145 | |
1da177e4 LT |
1146 | config MODULE_UNLOAD |
1147 | bool "Module unloading" | |
1da177e4 LT |
1148 | help |
1149 | Without this option you will not be able to unload any | |
1150 | modules (note that some modules may not be unloadable | |
f7f5b675 DV |
1151 | anyway), which makes your kernel smaller, faster |
1152 | and simpler. If unsure, say Y. | |
1da177e4 LT |
1153 | |
1154 | config MODULE_FORCE_UNLOAD | |
1155 | bool "Forced module unloading" | |
1156 | depends on MODULE_UNLOAD && EXPERIMENTAL | |
1157 | help | |
1158 | This option allows you to force a module to unload, even if the | |
1159 | kernel believes it is unsafe: the kernel will remove the module | |
1160 | without waiting for anyone to stop using it (using the -f option to | |
1161 | rmmod). This is mainly for kernel developers and desperate users. | |
1162 | If unsure, say N. | |
1163 | ||
1da177e4 | 1164 | config MODVERSIONS |
0d541643 | 1165 | bool "Module versioning support" |
1da177e4 LT |
1166 | help |
1167 | Usually, you have to use modules compiled with your kernel. | |
1168 | Saying Y here makes it sometimes possible to use modules | |
1169 | compiled for different kernels, by adding enough information | |
1170 | to the modules to (hopefully) spot any changes which would | |
1171 | make them incompatible with the kernel you are running. If | |
1172 | unsure, say N. | |
1173 | ||
1174 | config MODULE_SRCVERSION_ALL | |
1175 | bool "Source checksum for all modules" | |
1da177e4 LT |
1176 | help |
1177 | Modules which contain a MODULE_VERSION get an extra "srcversion" | |
1178 | field inserted into their modinfo section, which contains a | |
1179 | sum of the source files which made it. This helps maintainers | |
1180 | see exactly which source was used to build a module (since | |
1181 | others sometimes change the module source without updating | |
1182 | the version). With this option, such a "srcversion" field | |
1183 | will be created for all modules. If unsure, say N. | |
1184 | ||
0b0de144 RD |
1185 | endif # MODULES |
1186 | ||
98a79d6a RR |
1187 | config INIT_ALL_POSSIBLE |
1188 | bool | |
1189 | help | |
1190 | Back when each arch used to define their own cpu_online_map and | |
1191 | cpu_possible_map, some of them chose to initialize cpu_possible_map | |
1192 | with all 1s, and others with all 0s. When they were centralised, | |
1193 | it was better to provide this option than to break all the archs | |
692105b8 | 1194 | and have several arch maintainers pursuing me down dark alleys. |
98a79d6a | 1195 | |
1da177e4 LT |
1196 | config STOP_MACHINE |
1197 | bool | |
1198 | default y | |
1199 | depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU | |
1200 | help | |
1201 | Need stop_machine() primitive. | |
3a65dfe8 | 1202 | |
3a65dfe8 | 1203 | source "block/Kconfig" |
e98c3202 AK |
1204 | |
1205 | config PREEMPT_NOTIFIERS | |
1206 | bool | |
e260be67 | 1207 |