1 # SPDX-License-Identifier: GPL-2.0-only !! 1 config ARCH
2 config CC_VERSION_TEXT <<
3 string 2 string
4 default "$(CC_VERSION_TEXT)" !! 3 option env="ARCH"
5 help <<
6 This is used in unclear ways: <<
7 <<
8 - Re-run Kconfig when the compiler i <<
9 The 'default' property references <<
10 CC_VERSION_TEXT so it is recorded <<
11 When the compiler is updated, Kcon <<
12 <<
13 - Ensure full rebuild when the compi <<
14 include/linux/compiler-version.h c <<
15 line so fixdep adds include/config <<
16 auto-generated dependency. When th <<
17 will touch it and then every file <<
18 <<
19 config CC_IS_GCC <<
20 def_bool $(success,test "$(cc-name)" = <<
21 <<
22 config GCC_VERSION <<
23 int <<
24 default $(cc-version) if CC_IS_GCC <<
25 default 0 <<
26 <<
27 config CC_IS_CLANG <<
28 def_bool $(success,test "$(cc-name)" = <<
29 <<
30 config CLANG_VERSION <<
31 int <<
32 default $(cc-version) if CC_IS_CLANG <<
33 default 0 <<
34 <<
35 config AS_IS_GNU <<
36 def_bool $(success,test "$(as-name)" = <<
37 <<
38 config AS_IS_LLVM <<
39 def_bool $(success,test "$(as-name)" = <<
40 <<
41 config AS_VERSION <<
42 int <<
43 # Use clang version if this is the int <<
44 default CLANG_VERSION if AS_IS_LLVM <<
45 default $(as-version) <<
46 <<
47 config LD_IS_BFD <<
48 def_bool $(success,test "$(ld-name)" = <<
49 <<
50 config LD_VERSION <<
51 int <<
52 default $(ld-version) if LD_IS_BFD <<
53 default 0 <<
54 <<
55 config LD_IS_LLD <<
56 def_bool $(success,test "$(ld-name)" = <<
57 <<
58 config LLD_VERSION <<
59 int <<
60 default $(ld-version) if LD_IS_LLD <<
61 default 0 <<
62 <<
63 config RUSTC_VERSION <<
64 int <<
65 default $(rustc-version) <<
66 help <<
67 It does not depend on `RUST` since t <<
68 in a `depends on`. <<
69 <<
70 config RUST_IS_AVAILABLE <<
71 def_bool $(success,$(srctree)/scripts/ <<
72 help <<
73 This shows whether a suitable Rust t <<
74 <<
75 Please see Documentation/rust/quick- <<
76 to satisfy the build requirements of <<
77 <<
78 In particular, the Makefile target ' <<
79 why the Rust toolchain is not being <<
80 <<
81 config RUSTC_LLVM_VERSION <<
82 int <<
83 default $(rustc-llvm-version) <<
84 <<
85 config CC_CAN_LINK <<
86 bool <<
87 default $(success,$(srctree)/scripts/c <<
88 default $(success,$(srctree)/scripts/c <<
89 <<
90 config CC_CAN_LINK_STATIC <<
91 bool <<
92 default $(success,$(srctree)/scripts/c <<
93 default $(success,$(srctree)/scripts/c <<
94 4
95 # Fixed in GCC 14, 13.3, 12.4 and 11.5 !! 5 config KERNELVERSION
96 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id !! 6 string
97 config GCC_ASM_GOTO_OUTPUT_BROKEN !! 7 option env="KERNELVERSION"
98 bool <<
99 depends on CC_IS_GCC <<
100 default y if GCC_VERSION < 110500 <<
101 default y if GCC_VERSION >= 120000 && <<
102 default y if GCC_VERSION >= 130000 && <<
103 <<
104 config CC_HAS_ASM_GOTO_OUTPUT <<
105 def_bool y <<
106 depends on !GCC_ASM_GOTO_OUTPUT_BROKEN <<
107 depends on $(success,echo 'int foo(int <<
108 <<
109 config CC_HAS_ASM_GOTO_TIED_OUTPUT <<
110 depends on CC_HAS_ASM_GOTO_OUTPUT <<
111 # Detect buggy gcc and clang, fixed in <<
112 def_bool $(success,echo 'int foo(int * <<
113 <<
114 config TOOLS_SUPPORT_RELR <<
115 def_bool $(success,env "CC=$(CC)" "LD= <<
116 <<
117 config CC_HAS_ASM_INLINE <<
118 def_bool $(success,echo 'void foo(void <<
119 <<
120 config CC_HAS_NO_PROFILE_FN_ATTR <<
121 def_bool $(success,echo '__attribute__ <<
122 8
123 config PAHOLE_VERSION !! 9 config DEFCONFIG_LIST
124 int !! 10 string
125 default $(shell,$(srctree)/scripts/pah !! 11 depends on !UML
>> 12 option defconfig_list
>> 13 default "/lib/modules/$UNAME_RELEASE/.config"
>> 14 default "/etc/kernel-config"
>> 15 default "/boot/config-$UNAME_RELEASE"
>> 16 default "$ARCH_DEFCONFIG"
>> 17 default "arch/$ARCH/defconfig"
126 18
127 config CONSTRUCTORS 19 config CONSTRUCTORS
128 bool 20 bool
129 !! 21 depends on !UML
130 config IRQ_WORK !! 22 default y
131 def_bool y if SMP <<
132 <<
133 config BUILDTIME_TABLE_SORT <<
134 bool <<
135 <<
136 config THREAD_INFO_IN_TASK <<
137 bool <<
138 help <<
139 Select this to move thread_info off <<
140 make this work, an arch will need to <<
141 except flags and fix any runtime bug <<
142 <<
143 One subtle change that will be neede <<
144 and put_task_stack() in save_thread_ <<
145 23
146 menu "General setup" 24 menu "General setup"
147 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
148 config BROKEN 57 config BROKEN
149 bool 58 bool
150 59
151 config BROKEN_ON_SMP 60 config BROKEN_ON_SMP
152 bool 61 bool
153 depends on BROKEN || !SMP 62 depends on BROKEN || !SMP
154 default y 63 default y
155 64
>> 65 config LOCK_KERNEL
>> 66 bool
>> 67 depends on SMP || PREEMPT
>> 68 default y
>> 69
156 config INIT_ENV_ARG_LIMIT 70 config INIT_ENV_ARG_LIMIT
157 int 71 int
158 default 32 if !UML 72 default 32 if !UML
159 default 128 if UML 73 default 128 if UML
160 help 74 help
161 Maximum of each of the number of arg 75 Maximum of each of the number of arguments and environment
162 variables passed to init from the ke 76 variables passed to init from the kernel command line.
163 77
164 config COMPILE_TEST <<
165 bool "Compile also drivers which will <<
166 depends on HAS_IOMEM <<
167 help <<
168 Some drivers can be compiled on a di <<
169 intended to be run on. Despite they <<
170 when they load they cannot be used d <<
171 developers still, opposing to distri <<
172 drivers to compile-test them. <<
173 <<
174 If you are a developer and want to b <<
175 here. If you are a user/distributor, <<
176 drivers to be distributed. <<
177 <<
178 config WERROR <<
179 bool "Compile the kernel with warnings <<
180 default COMPILE_TEST <<
181 help <<
182 A kernel build should not cause any <<
183 enables the '-Werror' (for C) and '- <<
184 to enforce that rule by default. Cer <<
185 such as the linker may be upgraded t <<
186 well. <<
187 <<
188 However, if you have a new (or very <<
189 and unusual warnings, or you have so <<
190 you may need to disable this config <<
191 successfully build the kernel. <<
192 <<
193 If in doubt, say Y. <<
194 <<
195 config UAPI_HEADER_TEST <<
196 bool "Compile test UAPI headers" <<
197 depends on HEADERS_INSTALL && CC_CAN_L <<
198 help <<
199 Compile test headers exported to use <<
200 self-contained, i.e. compilable as s <<
201 <<
202 If you are a developer or tester and <<
203 headers are self-contained, say Y he <<
204 78
205 config LOCALVERSION 79 config LOCALVERSION
206 string "Local version - append to kern 80 string "Local version - append to kernel release"
207 help 81 help
208 Append an extra string to the end of 82 Append an extra string to the end of your kernel version.
209 This will show up when you type unam 83 This will show up when you type uname, for example.
210 The string you set here will be appe 84 The string you set here will be appended after the contents of
211 any files with a filename matching l 85 any files with a filename matching localversion* in your
212 object and source tree, in that orde 86 object and source tree, in that order. Your total string can
213 be a maximum of 64 characters. 87 be a maximum of 64 characters.
214 88
215 config LOCALVERSION_AUTO 89 config LOCALVERSION_AUTO
216 bool "Automatically append version inf 90 bool "Automatically append version information to the version string"
217 default y 91 default y
218 depends on !COMPILE_TEST <<
219 help 92 help
220 This will try to automatically deter 93 This will try to automatically determine if the current tree is a
221 release tree by looking for git tags 94 release tree by looking for git tags that belong to the current
222 top of tree revision. 95 top of tree revision.
223 96
224 A string of the format -gxxxxxxxx wi 97 A string of the format -gxxxxxxxx will be added to the localversion
225 if a git-based tree is found. The s 98 if a git-based tree is found. The string generated by this will be
226 appended after any matching localver 99 appended after any matching localversion* files, and after the value
227 set in CONFIG_LOCALVERSION. 100 set in CONFIG_LOCALVERSION.
228 101
229 (The actual string used here is the !! 102 (The actual string used here is the first eight characters produced
230 by running the command: 103 by running the command:
231 104
232 $ git rev-parse --verify HEAD 105 $ git rev-parse --verify HEAD
233 106
234 which is done within the script "scr 107 which is done within the script "scripts/setlocalversion".)
235 108
236 config BUILD_SALT <<
237 string "Build ID Salt" <<
238 default "" <<
239 help <<
240 The build ID is used to link binarie <<
241 this option will use the value in th <<
242 This is mostly useful for distributi <<
243 build is unique between builds. It's <<
244 <<
245 config HAVE_KERNEL_GZIP 109 config HAVE_KERNEL_GZIP
246 bool 110 bool
247 111
248 config HAVE_KERNEL_BZIP2 112 config HAVE_KERNEL_BZIP2
249 bool 113 bool
250 114
251 config HAVE_KERNEL_LZMA 115 config HAVE_KERNEL_LZMA
252 bool 116 bool
253 117
254 config HAVE_KERNEL_XZ <<
255 bool <<
256 <<
257 config HAVE_KERNEL_LZO <<
258 bool <<
259 <<
260 config HAVE_KERNEL_LZ4 <<
261 bool <<
262 <<
263 config HAVE_KERNEL_ZSTD <<
264 bool <<
265 <<
266 config HAVE_KERNEL_UNCOMPRESSED <<
267 bool <<
268 <<
269 choice 118 choice
270 prompt "Kernel compression mode" 119 prompt "Kernel compression mode"
271 default KERNEL_GZIP 120 default KERNEL_GZIP
272 depends on HAVE_KERNEL_GZIP || HAVE_KE !! 121 depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
273 help 122 help
274 The linux kernel is a kind of self-e 123 The linux kernel is a kind of self-extracting executable.
275 Several compression algorithms are a 124 Several compression algorithms are available, which differ
276 in efficiency, compression and decom 125 in efficiency, compression and decompression speed.
277 Compression speed is only relevant w 126 Compression speed is only relevant when building a kernel.
278 Decompression speed is relevant at e 127 Decompression speed is relevant at each boot.
279 128
280 If you have any problems with bzip2 129 If you have any problems with bzip2 or lzma compressed
281 kernels, mail me (Alain Knaff) <alain 130 kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older
282 version of this functionality (bzip2 131 version of this functionality (bzip2 only), for 2.4, was
283 supplied by Christian Ludwig) 132 supplied by Christian Ludwig)
284 133
285 High compression options are mostly 134 High compression options are mostly useful for users, who
286 are low on disk space (embedded syst 135 are low on disk space (embedded systems), but for whom ram
287 size matters less. 136 size matters less.
288 137
289 If in doubt, select 'gzip' 138 If in doubt, select 'gzip'
290 139
291 config KERNEL_GZIP 140 config KERNEL_GZIP
292 bool "Gzip" 141 bool "Gzip"
293 depends on HAVE_KERNEL_GZIP 142 depends on HAVE_KERNEL_GZIP
294 help 143 help
295 The old and tried gzip compression. !! 144 The old and tried gzip compression. Its compression ratio is
296 between compression ratio and decomp !! 145 the poorest among the 3 choices; however its speed (both
>> 146 compression and decompression) is the fastest.
297 147
298 config KERNEL_BZIP2 148 config KERNEL_BZIP2
299 bool "Bzip2" 149 bool "Bzip2"
300 depends on HAVE_KERNEL_BZIP2 150 depends on HAVE_KERNEL_BZIP2
301 help 151 help
302 Its compression ratio and speed is i 152 Its compression ratio and speed is intermediate.
303 Decompression speed is slowest among !! 153 Decompression speed is slowest among the three. The kernel
304 size is about 10% smaller with bzip2 154 size is about 10% smaller with bzip2, in comparison to gzip.
305 Bzip2 uses a large amount of memory. 155 Bzip2 uses a large amount of memory. For modern kernels you
306 will need at least 8MB RAM or more f 156 will need at least 8MB RAM or more for booting.
307 157
308 config KERNEL_LZMA 158 config KERNEL_LZMA
309 bool "LZMA" 159 bool "LZMA"
310 depends on HAVE_KERNEL_LZMA 160 depends on HAVE_KERNEL_LZMA
311 help 161 help
312 This compression algorithm's ratio i !! 162 The most recent compression algorithm.
313 is between gzip and bzip2. Compress !! 163 Its ratio is best, decompression speed is between the other
314 The kernel size is about 33% smaller !! 164 two. Compression is slowest. The kernel size is about 33%
315 !! 165 smaller with LZMA in comparison to gzip.
316 config KERNEL_XZ <<
317 bool "XZ" <<
318 depends on HAVE_KERNEL_XZ <<
319 help <<
320 XZ uses the LZMA2 algorithm and inst <<
321 BCJ filters which can improve compre <<
322 code. The size of the kernel is abou <<
323 comparison to gzip. On architectures <<
324 filter (i386, x86_64, ARM, ARM64, RI <<
325 and SPARC), XZ will create a few per <<
326 plain LZMA. <<
327 <<
328 The speed is about the same as with <<
329 speed of XZ is better than that of b <<
330 and LZO. Compression is slow. <<
331 <<
332 config KERNEL_LZO <<
333 bool "LZO" <<
334 depends on HAVE_KERNEL_LZO <<
335 help <<
336 Its compression ratio is the poorest <<
337 size is about 10% bigger than gzip; <<
338 (both compression and decompression) <<
339 <<
340 config KERNEL_LZ4 <<
341 bool "LZ4" <<
342 depends on HAVE_KERNEL_LZ4 <<
343 help <<
344 LZ4 is an LZ77-type compressor with <<
345 A preliminary version of LZ4 de/comp <<
346 <https://code.google.com/p/lz4/>. <<
347 <<
348 Its compression ratio is worse than <<
349 is about 8% bigger than LZO. But the <<
350 faster than LZO. <<
351 <<
352 config KERNEL_ZSTD <<
353 bool "ZSTD" <<
354 depends on HAVE_KERNEL_ZSTD <<
355 help <<
356 ZSTD is a compression algorithm targ <<
357 with fast decompression speed. It wi <<
358 decompress around the same speed as <<
359 will need at least 192 KB RAM or mor <<
360 line tool is required for compressio <<
361 <<
362 config KERNEL_UNCOMPRESSED <<
363 bool "None" <<
364 depends on HAVE_KERNEL_UNCOMPRESSED <<
365 help <<
366 Produce uncompressed kernel image. T <<
367 you want. It is useful for debugging <<
368 environments, where decompressing an <<
369 slow. This option allows early boot <<
370 and jump right at uncompressed kerne <<
371 166
372 endchoice 167 endchoice
373 168
374 config DEFAULT_INIT !! 169 config SWAP
375 string "Default init path" !! 170 bool "Support for paging of anonymous memory (swap)"
376 default "" !! 171 depends on MMU && BLOCK
377 help !! 172 default y
378 This option determines the default i !! 173 help
379 option is passed on the kernel comma !! 174 This option allows you to choose whether you want to have support
380 not present, we will still then move !! 175 for so called swap devices or swap files in your kernel that are
381 locations (e.g. /sbin/init, etc). If !! 176 used to provide more virtual memory than the actual RAM present
382 the fallback list when init= is not !! 177 in your computer. If unsure say Y.
383 <<
384 config DEFAULT_HOSTNAME <<
385 string "Default hostname" <<
386 default "(none)" <<
387 help <<
388 This option determines the default s <<
389 calls sethostname(2). The kernel tra <<
390 but you may wish to use a different <<
391 system more usable with less configu <<
392 178
393 config SYSVIPC 179 config SYSVIPC
394 bool "System V IPC" 180 bool "System V IPC"
395 help !! 181 ---help---
396 Inter Process Communication is a sui 182 Inter Process Communication is a suite of library functions and
397 system calls which let processes (ru 183 system calls which let processes (running programs) synchronize and
398 exchange information. It is generall 184 exchange information. It is generally considered to be a good thing,
399 and some programs won't run unless y 185 and some programs won't run unless you say Y here. In particular, if
400 you want to run the DOS emulator dos 186 you want to run the DOS emulator dosemu under Linux (read the
401 DOSEMU-HOWTO, available from <http:/ 187 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
402 you'll need to say Y here. 188 you'll need to say Y here.
403 189
404 You can find documentation about IPC 190 You can find documentation about IPC with "info ipc" and also in
405 section 6.4 of the Linux Programmer' 191 section 6.4 of the Linux Programmer's Guide, available from
406 <http://www.tldp.org/guides.html>. 192 <http://www.tldp.org/guides.html>.
407 193
408 config SYSVIPC_SYSCTL 194 config SYSVIPC_SYSCTL
409 bool 195 bool
410 depends on SYSVIPC 196 depends on SYSVIPC
411 depends on SYSCTL 197 depends on SYSCTL
412 default y 198 default y
413 199
414 config SYSVIPC_COMPAT <<
415 def_bool y <<
416 depends on COMPAT && SYSVIPC <<
417 <<
418 config POSIX_MQUEUE 200 config POSIX_MQUEUE
419 bool "POSIX Message Queues" 201 bool "POSIX Message Queues"
420 depends on NET !! 202 depends on NET && EXPERIMENTAL
421 help !! 203 ---help---
422 POSIX variant of message queues is a 204 POSIX variant of message queues is a part of IPC. In POSIX message
423 queues every message has a priority 205 queues every message has a priority which decides about succession
424 of receiving it by a process. If you 206 of receiving it by a process. If you want to compile and run
425 programs written e.g. for Solaris wi 207 programs written e.g. for Solaris with use of its POSIX message
426 queues (functions mq_*) say Y here. 208 queues (functions mq_*) say Y here.
427 209
428 POSIX message queues are visible as 210 POSIX message queues are visible as a filesystem called 'mqueue'
429 and can be mounted somewhere if you 211 and can be mounted somewhere if you want to do filesystem
430 operations on message queues. 212 operations on message queues.
431 213
432 If unsure, say Y. 214 If unsure, say Y.
433 215
434 config POSIX_MQUEUE_SYSCTL 216 config POSIX_MQUEUE_SYSCTL
435 bool 217 bool
436 depends on POSIX_MQUEUE 218 depends on POSIX_MQUEUE
437 depends on SYSCTL 219 depends on SYSCTL
438 default y 220 default y
439 221
440 config WATCH_QUEUE <<
441 bool "General notification queue" <<
442 default n <<
443 help <<
444 <<
445 This is a general notification queue <<
446 userspace by splicing them into pipe <<
447 with watches for key/keyring change <<
448 notifications. <<
449 <<
450 See Documentation/core-api/watch_que <<
451 <<
452 config CROSS_MEMORY_ATTACH <<
453 bool "Enable process_vm_readv/writev s <<
454 depends on MMU <<
455 default y <<
456 help <<
457 Enabling this option adds the system <<
458 process_vm_writev which allow a proc <<
459 to directly read from or write to an <<
460 See the man page for more details. <<
461 <<
462 config USELIB <<
463 bool "uselib syscall (for libc5 and ea <<
464 default ALPHA || M68K || SPARC <<
465 help <<
466 This option enables the uselib sysca <<
467 dynamic linker from libc5 and earlie <<
468 system call. If you intend to run p <<
469 earlier, you may need to enable this <<
470 running glibc can safely disable thi <<
471 <<
472 config AUDIT <<
473 bool "Auditing support" <<
474 depends on NET <<
475 help <<
476 Enable auditing infrastructure that <<
477 kernel subsystem, such as SELinux (w <<
478 logging of avc messages output). Sy <<
479 on architectures which support it. <<
480 <<
481 config HAVE_ARCH_AUDITSYSCALL <<
482 bool <<
483 <<
484 config AUDITSYSCALL <<
485 def_bool y <<
486 depends on AUDIT && HAVE_ARCH_AUDITSYS <<
487 select FSNOTIFY <<
488 <<
489 source "kernel/irq/Kconfig" <<
490 source "kernel/time/Kconfig" <<
491 source "kernel/bpf/Kconfig" <<
492 source "kernel/Kconfig.preempt" <<
493 <<
494 menu "CPU/Task time and stats accounting" <<
495 <<
496 config VIRT_CPU_ACCOUNTING <<
497 bool <<
498 <<
499 choice <<
500 prompt "Cputime accounting" <<
501 default TICK_CPU_ACCOUNTING <<
502 <<
503 # Kind of a stub config for the pure tick base <<
504 config TICK_CPU_ACCOUNTING <<
505 bool "Simple tick based cputime accoun <<
506 depends on !S390 && !NO_HZ_FULL <<
507 help <<
508 This is the basic tick based cputime <<
509 statistics about user, system and id <<
510 granularity. <<
511 <<
512 If unsure, say Y. <<
513 <<
514 config VIRT_CPU_ACCOUNTING_NATIVE <<
515 bool "Deterministic task and CPU time <<
516 depends on HAVE_VIRT_CPU_ACCOUNTING && <<
517 select VIRT_CPU_ACCOUNTING <<
518 help <<
519 Select this option to enable more ac <<
520 accounting. This is done by reading <<
521 kernel entry and exit and on transit <<
522 between system, softirq and hardirq <<
523 small performance impact. In the ca <<
524 this also enables accounting of stol <<
525 systems. <<
526 <<
527 config VIRT_CPU_ACCOUNTING_GEN <<
528 bool "Full dynticks CPU time accountin <<
529 depends on HAVE_CONTEXT_TRACKING_USER <<
530 depends on HAVE_VIRT_CPU_ACCOUNTING_GE <<
531 depends on GENERIC_CLOCKEVENTS <<
532 select VIRT_CPU_ACCOUNTING <<
533 select CONTEXT_TRACKING_USER <<
534 help <<
535 Select this option to enable task an <<
536 dynticks systems. This accounting is <<
537 kernel-user boundaries using the con <<
538 The accounting is thus performed at <<
539 overhead. <<
540 <<
541 For now this is only useful if you a <<
542 dynticks subsystem development. <<
543 <<
544 If unsure, say N. <<
545 <<
546 endchoice <<
547 <<
548 config IRQ_TIME_ACCOUNTING <<
549 bool "Fine granularity task level IRQ <<
550 depends on HAVE_IRQ_TIME_ACCOUNTING && <<
551 help <<
552 Select this option to enable fine gr <<
553 accounting. This is done by reading <<
554 transitions between softirq and hard <<
555 small performance impact. <<
556 <<
557 If in doubt, say N here. <<
558 <<
559 config HAVE_SCHED_AVG_IRQ <<
560 def_bool y <<
561 depends on IRQ_TIME_ACCOUNTING || PARA <<
562 depends on SMP <<
563 <<
564 config SCHED_HW_PRESSURE <<
565 bool <<
566 default y if ARM && ARM_CPU_TOPOLOGY <<
567 default y if ARM64 <<
568 depends on SMP <<
569 depends on CPU_FREQ_THERMAL <<
570 help <<
571 Select this option to enable HW pres <<
572 scheduler. HW pressure is the value <<
573 that reflects the reduction in CPU c <<
574 HW throttling. HW throttling occurs <<
575 a CPU is capped due to high operatin <<
576 <<
577 If selected, the scheduler will be a <<
578 i.e. put less load on throttled CPUs <<
579 <<
580 This requires the architecture to im <<
581 arch_update_hw_pressure() and arch_s <<
582 <<
583 config BSD_PROCESS_ACCT 222 config BSD_PROCESS_ACCT
584 bool "BSD Process Accounting" 223 bool "BSD Process Accounting"
585 depends on MULTIUSER <<
586 help 224 help
587 If you say Y here, a user level prog 225 If you say Y here, a user level program will be able to instruct the
588 kernel (via a special system call) t 226 kernel (via a special system call) to write process accounting
589 information to a file: whenever a pr 227 information to a file: whenever a process exits, information about
590 that process will be appended to the 228 that process will be appended to the file by the kernel. The
591 information includes things such as 229 information includes things such as creation time, owning user,
592 command name, memory usage, controll 230 command name, memory usage, controlling terminal etc. (the complete
593 list is in the struct acct in <file: 231 list is in the struct acct in <file:include/linux/acct.h>). It is
594 up to the user level program to do u 232 up to the user level program to do useful things with this
595 information. This is generally a go 233 information. This is generally a good idea, so say Y.
596 234
597 config BSD_PROCESS_ACCT_V3 235 config BSD_PROCESS_ACCT_V3
598 bool "BSD Process Accounting version 3 236 bool "BSD Process Accounting version 3 file format"
599 depends on BSD_PROCESS_ACCT 237 depends on BSD_PROCESS_ACCT
600 default n 238 default n
601 help 239 help
602 If you say Y here, the process accou 240 If you say Y here, the process accounting information is written
603 in a new file format that also logs 241 in a new file format that also logs the process IDs of each
604 process and its parent. Note that th !! 242 process and it's parent. Note that this file format is incompatible
605 with previous v0/v1/v2 file formats, 243 with previous v0/v1/v2 file formats, so you will need updated tools
606 for processing it. A preliminary ver 244 for processing it. A preliminary version of these tools is available
607 at <http://www.gnu.org/software/acct 245 at <http://www.gnu.org/software/acct/>.
608 246
609 config TASKSTATS 247 config TASKSTATS
610 bool "Export task/process statistics t !! 248 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
611 depends on NET 249 depends on NET
612 depends on MULTIUSER <<
613 default n 250 default n
614 help 251 help
615 Export selected statistics for tasks 252 Export selected statistics for tasks/processes through the
616 generic netlink interface. Unlike BS 253 generic netlink interface. Unlike BSD process accounting, the
617 statistics are available during the 254 statistics are available during the lifetime of tasks/processes as
618 responses to commands. Like BSD acco 255 responses to commands. Like BSD accounting, they are sent to user
619 space on task exit. 256 space on task exit.
620 257
621 Say N if unsure. 258 Say N if unsure.
622 259
623 config TASK_DELAY_ACCT 260 config TASK_DELAY_ACCT
624 bool "Enable per-task delay accounting !! 261 bool "Enable per-task delay accounting (EXPERIMENTAL)"
625 depends on TASKSTATS 262 depends on TASKSTATS
626 select SCHED_INFO <<
627 help 263 help
628 Collect information on time spent by 264 Collect information on time spent by a task waiting for system
629 resources like cpu, synchronous bloc 265 resources like cpu, synchronous block I/O completion and swapping
630 in pages. Such statistics can help i 266 in pages. Such statistics can help in setting a task's priorities
631 relative to other tasks for cpu, io, 267 relative to other tasks for cpu, io, rss limits etc.
632 268
633 Say N if unsure. 269 Say N if unsure.
634 270
635 config TASK_XACCT 271 config TASK_XACCT
636 bool "Enable extended accounting over !! 272 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
637 depends on TASKSTATS 273 depends on TASKSTATS
638 help 274 help
639 Collect extended task accounting dat 275 Collect extended task accounting data and send the data
640 to userland for processing over the 276 to userland for processing over the taskstats interface.
641 277
642 Say N if unsure. 278 Say N if unsure.
643 279
644 config TASK_IO_ACCOUNTING 280 config TASK_IO_ACCOUNTING
645 bool "Enable per-task storage I/O acco !! 281 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
646 depends on TASK_XACCT 282 depends on TASK_XACCT
647 help 283 help
648 Collect information on the number of 284 Collect information on the number of bytes of storage I/O which this
649 task has caused. 285 task has caused.
650 286
651 Say N if unsure. 287 Say N if unsure.
652 288
653 config PSI !! 289 config AUDIT
654 bool "Pressure stall information track !! 290 bool "Auditing support"
655 select KERNFS !! 291 depends on NET
656 help !! 292 help
657 Collect metrics that indicate how ov !! 293 Enable auditing infrastructure that can be used with another
658 and IO capacity are in the system. !! 294 kernel subsystem, such as SELinux (which requires this for
659 !! 295 logging of avc messages output). Does not do system-call
660 If you say Y here, the kernel will c !! 296 auditing without CONFIG_AUDITSYSCALL.
661 pressure statistics files cpu, memor <<
662 the share of walltime in which some <<
663 delayed due to contention of the res <<
664 <<
665 In kernels with cgroup support, cgro <<
666 have cpu.pressure, memory.pressure, <<
667 which aggregate pressure stalls for <<
668 297
669 For more details see Documentation/a !! 298 config AUDITSYSCALL
>> 299 bool "Enable system-call auditing support"
>> 300 depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH)
>> 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,
>> 305 such as SELinux. To use audit's filesystem watch feature, please
>> 306 ensure that INOTIFY is configured.
670 307
671 Say N if unsure. !! 308 config AUDIT_TREE
>> 309 def_bool y
>> 310 depends on AUDITSYSCALL
>> 311 select INOTIFY
672 312
673 config PSI_DEFAULT_DISABLED !! 313 menu "RCU Subsystem"
674 bool "Require boot parameter to enable <<
675 default n <<
676 depends on PSI <<
677 help <<
678 If set, pressure stall information t <<
679 per default but can be enabled throu <<
680 kernel commandline during boot. <<
681 <<
682 This feature adds some code to the t <<
683 paths of the scheduler. The overhead <<
684 common scheduling-intense workloads <<
685 webservers, memcache), but it does s <<
686 scheduler stress tests, such as hack <<
687 314
688 If you are paranoid and not sure wha !! 315 choice
689 used for, say Y. !! 316 prompt "RCU Implementation"
>> 317 default TREE_RCU
690 318
691 Say N if unsure. !! 319 config TREE_RCU
>> 320 bool "Tree-based hierarchical RCU"
>> 321 help
>> 322 This option selects the RCU implementation that is
>> 323 designed for very large SMP system with hundreds or
>> 324 thousands of CPUs. It also scales down nicely to
>> 325 smaller systems.
>> 326
>> 327 config TREE_PREEMPT_RCU
>> 328 bool "Preemptable tree-based hierarchical RCU"
>> 329 depends on PREEMPT
>> 330 help
>> 331 This option selects the RCU implementation that is
>> 332 designed for very large SMP systems with hundreds or
>> 333 thousands of CPUs, but for which real-time response
>> 334 is also required. It also scales down nicely to
>> 335 smaller systems.
692 336
693 endmenu # "CPU/Task time and stats accounting" !! 337 endchoice
694 338
695 config CPU_ISOLATION !! 339 config RCU_TRACE
696 bool "CPU isolation" !! 340 bool "Enable tracing for RCU"
697 depends on SMP || COMPILE_TEST !! 341 depends on TREE_RCU || TREE_PREEMPT_RCU
698 default y !! 342 help
>> 343 This option provides tracing in RCU which presents stats
>> 344 in debugfs for debugging RCU implementation.
>> 345
>> 346 Say Y here if you want to enable RCU tracing
>> 347 Say N if you are unsure.
>> 348
>> 349 config RCU_FANOUT
>> 350 int "Tree-based hierarchical RCU fanout value"
>> 351 range 2 64 if 64BIT
>> 352 range 2 32 if !64BIT
>> 353 depends on TREE_RCU || TREE_PREEMPT_RCU
>> 354 default 64 if 64BIT
>> 355 default 32 if !64BIT
>> 356 help
>> 357 This option controls the fanout of hierarchical implementations
>> 358 of RCU, allowing RCU to work efficiently on machines with
>> 359 large numbers of CPUs. This value must be at least the cube
>> 360 root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
>> 361 systems and up to 262,144 for 64-bit systems.
>> 362
>> 363 Select a specific number if testing RCU itself.
>> 364 Take the default if unsure.
>> 365
>> 366 config RCU_FANOUT_EXACT
>> 367 bool "Disable tree-based hierarchical RCU auto-balancing"
>> 368 depends on TREE_RCU || TREE_PREEMPT_RCU
>> 369 default n
699 help 370 help
700 Make sure that CPUs running critical !! 371 This option forces use of the exact RCU_FANOUT value specified,
701 any source of "noise" such as unboun !! 372 regardless of imbalances in the hierarchy. This is useful for
702 Unbound jobs get offloaded to housek !! 373 testing RCU itself, and might one day be useful on systems with
703 the "isolcpus=" boot parameter. !! 374 strong NUMA behavior.
704 375
705 Say Y if unsure. !! 376 Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
706 377
707 source "kernel/rcu/Kconfig" !! 378 Say N if unsure.
>> 379
>> 380 config TREE_RCU_TRACE
>> 381 def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU )
>> 382 select DEBUG_FS
>> 383 help
>> 384 This option provides tracing for the TREE_RCU and
>> 385 TREE_PREEMPT_RCU implementations, permitting Makefile to
>> 386 trivially select kernel/rcutree_trace.c.
>> 387
>> 388 endmenu # "RCU Subsystem"
708 389
709 config IKCONFIG 390 config IKCONFIG
710 tristate "Kernel .config support" 391 tristate "Kernel .config support"
711 help !! 392 ---help---
712 This option enables the complete Lin 393 This option enables the complete Linux kernel ".config" file
713 contents to be saved in the kernel. 394 contents to be saved in the kernel. It provides documentation
714 of which kernel options are used in 395 of which kernel options are used in a running kernel or in an
715 on-disk kernel. This information ca 396 on-disk kernel. This information can be extracted from the kernel
716 image file with the script scripts/e 397 image file with the script scripts/extract-ikconfig and used as
717 input to rebuild the current kernel 398 input to rebuild the current kernel or to build another kernel.
718 It can also be extracted from a runn 399 It can also be extracted from a running kernel by reading
719 /proc/config.gz if enabled (below). 400 /proc/config.gz if enabled (below).
720 401
721 config IKCONFIG_PROC 402 config IKCONFIG_PROC
722 bool "Enable access to .config through 403 bool "Enable access to .config through /proc/config.gz"
723 depends on IKCONFIG && PROC_FS 404 depends on IKCONFIG && PROC_FS
724 help !! 405 ---help---
725 This option enables access to the ke 406 This option enables access to the kernel configuration file
726 through /proc/config.gz. 407 through /proc/config.gz.
727 408
728 config IKHEADERS <<
729 tristate "Enable kernel headers throug <<
730 depends on SYSFS <<
731 help <<
732 This option enables access to the in <<
733 the build process. These can be used <<
734 or similar programs. If you build t <<
735 kheaders.ko is built which can be lo <<
736 <<
737 config LOG_BUF_SHIFT 409 config LOG_BUF_SHIFT
738 int "Kernel log buffer size (16 => 64K 410 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
739 range 12 25 !! 411 range 12 21
740 default 17 412 default 17
741 depends on PRINTK <<
742 help 413 help
743 Select the minimal kernel log buffer !! 414 Select kernel log buffer size as a power of 2.
744 The final size is affected by LOG_CP <<
745 parameter, see below. Any higher siz <<
746 by "log_buf_len" boot parameter. <<
747 <<
748 Examples: 415 Examples:
749 17 => 128 KB !! 416 17 => 128 KB
750 16 => 64 KB 417 16 => 64 KB
751 15 => 32 KB !! 418 15 => 32 KB
752 14 => 16 KB !! 419 14 => 16 KB
753 13 => 8 KB 420 13 => 8 KB
754 12 => 4 KB 421 12 => 4 KB
755 422
756 config LOG_CPU_MAX_BUF_SHIFT <<
757 int "CPU kernel log buffer size contri <<
758 depends on SMP <<
759 range 0 21 <<
760 default 0 if BASE_SMALL <<
761 default 12 <<
762 depends on PRINTK <<
763 help <<
764 This option allows to increase the d <<
765 according to the number of CPUs. The <<
766 of each CPU as a power of 2. The use <<
767 lines however it might be much more <<
768 e.g. backtraces. <<
769 <<
770 The increased size means that a new <<
771 the original static one is unused. I <<
772 with more CPUs. Therefore this value <<
773 contributions is greater than the ha <<
774 buffer as defined by LOG_BUF_SHIFT. <<
775 so that more than 16 CPUs are needed <<
776 <<
777 Also this option is ignored when "lo <<
778 used as it forces an exact (power of <<
779 <<
780 The number of possible CPUs is used <<
781 hotplugging making the computation o <<
782 scenario while allowing a simple alg <<
783 <<
784 Examples shift values and their mean <<
785 17 => 128 KB for each CPU <<
786 16 => 64 KB for each CPU <<
787 15 => 32 KB for each CPU <<
788 14 => 16 KB for each CPU <<
789 13 => 8 KB for each CPU <<
790 12 => 4 KB for each CPU <<
791 <<
792 config PRINTK_INDEX <<
793 bool "Printk indexing debugfs interfac <<
794 depends on PRINTK && DEBUG_FS <<
795 help <<
796 Add support for indexing of all prin <<
797 at <debugfs>/printk/index/<module>. <<
798 <<
799 This can be used as part of maintain <<
800 /dev/kmsg, as it permits auditing th <<
801 kernel, allowing detection of cases <<
802 changed or no longer present. <<
803 <<
804 There is no additional runtime cost <<
805 <<
806 # 423 #
807 # Architectures with an unreliable sched_clock 424 # Architectures with an unreliable sched_clock() should select this:
808 # 425 #
809 config HAVE_UNSTABLE_SCHED_CLOCK 426 config HAVE_UNSTABLE_SCHED_CLOCK
810 bool 427 bool
811 428
812 config GENERIC_SCHED_CLOCK <<
813 bool <<
814 <<
815 menu "Scheduler features" <<
816 <<
817 config UCLAMP_TASK <<
818 bool "Enable utilization clamping for <<
819 depends on CPU_FREQ_GOV_SCHEDUTIL <<
820 help <<
821 This feature enables the scheduler t <<
822 of each CPU based on RUNNABLE tasks <<
823 <<
824 With this option, the user can speci <<
825 utilization allowed for RUNNABLE tas <<
826 the maximum frequency a task should <<
827 defines the minimum frequency it sho <<
828 <<
829 Both min and max utilization clamp v <<
830 aiming at improving its frequency se <<
831 enforce or grant any specific bandwi <<
832 <<
833 If in doubt, say N. <<
834 <<
835 config UCLAMP_BUCKETS_COUNT <<
836 int "Number of supported utilization c <<
837 range 5 20 <<
838 default 5 <<
839 depends on UCLAMP_TASK <<
840 help <<
841 Defines the number of clamp buckets <<
842 will be SCHED_CAPACITY_SCALE/UCLAMP_ <<
843 number of clamp buckets the finer th <<
844 the precision of clamping aggregatio <<
845 <<
846 For example, with the minimum config <<
847 clamp buckets tracking 20% utilizati <<
848 be refcounted in the [20..39]% bucke <<
849 effective value to 25%. <<
850 If a second 30% boosted task should <<
851 that task will be refcounted in the <<
852 it will boost the bucket clamp effec <<
853 The clamp effective value of a bucke <<
854 (20% in the example above) when ther <<
855 that bucket. <<
856 <<
857 An additional boost/capping margin c <<
858 example above the 25% task will be b <<
859 CPU. If that should be considered no <<
860 it's always possible to reduce the m <<
861 clamp buckets to trade off used memo <<
862 precision. <<
863 <<
864 If in doubt, use the default value. <<
865 <<
866 endmenu <<
867 <<
868 # <<
869 # For architectures that want to enable the su <<
870 # balancing logic: <<
871 # <<
872 config ARCH_SUPPORTS_NUMA_BALANCING <<
873 bool <<
874 <<
875 # <<
876 # For architectures that prefer to flush all T <<
877 # are unmapped instead of sending one IPI per <<
878 # must provide guarantees on what happens if a <<
879 # written after the unmap. Details are in mm/r <<
880 # should_defer_flush. The architecture should <<
881 # and the refill costs are offset by the savin <<
882 config ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH <<
883 bool <<
884 <<
885 config CC_HAS_INT128 <<
886 def_bool !$(cc-option,$(m64-flag) -D__ <<
887 <<
888 config CC_IMPLICIT_FALLTHROUGH <<
889 string <<
890 default "-Wimplicit-fallthrough=5" if <<
891 default "-Wimplicit-fallthrough" if CC <<
892 <<
893 # Currently, disable gcc-10+ array-bounds glob <<
894 # It's still broken in gcc-13, so no upper bou <<
895 config GCC10_NO_ARRAY_BOUNDS <<
896 def_bool y <<
897 <<
898 config CC_NO_ARRAY_BOUNDS <<
899 bool <<
900 default y if CC_IS_GCC && GCC_VERSION <<
901 <<
902 # Currently, disable -Wstringop-overflow for G <<
903 config GCC_NO_STRINGOP_OVERFLOW <<
904 def_bool y <<
905 <<
906 config CC_NO_STRINGOP_OVERFLOW <<
907 bool <<
908 default y if CC_IS_GCC && GCC_NO_STRIN <<
909 <<
910 config CC_STRINGOP_OVERFLOW <<
911 bool <<
912 default y if CC_IS_GCC && !CC_NO_STRIN <<
913 <<
914 # <<
915 # For architectures that know their GCC __int1 <<
916 # <<
917 config ARCH_SUPPORTS_INT128 <<
918 bool <<
919 <<
920 # For architectures that (ab)use NUMA to repre <<
921 # all cpu-local but of different latencies, su <<
922 # <<
923 config ARCH_WANT_NUMA_VARIABLE_LOCALITY <<
924 bool <<
925 <<
926 config NUMA_BALANCING <<
927 bool "Memory placement aware NUMA sche <<
928 depends on ARCH_SUPPORTS_NUMA_BALANCIN <<
929 depends on !ARCH_WANT_NUMA_VARIABLE_LO <<
930 depends on SMP && NUMA && MIGRATION && <<
931 help <<
932 This option adds support for automat <<
933 The mechanism is quite primitive and <<
934 it has references to the node the ta <<
935 <<
936 This system will be inactive on UMA <<
937 <<
938 config NUMA_BALANCING_DEFAULT_ENABLED <<
939 bool "Automatically enable NUMA aware <<
940 default y <<
941 depends on NUMA_BALANCING <<
942 help <<
943 If set, automatic NUMA balancing wil <<
944 machine. <<
945 <<
946 config SLAB_OBJ_EXT <<
947 bool <<
948 <<
949 menuconfig CGROUPS 429 menuconfig CGROUPS
950 bool "Control Group support" !! 430 boolean "Control Group support"
951 select KERNFS <<
952 help 431 help
953 This option adds support for groupin 432 This option adds support for grouping sets of processes together, for
954 use with process control subsystems 433 use with process control subsystems such as Cpusets, CFS, memory
955 controls or device isolation. 434 controls or device isolation.
956 See 435 See
957 - Documentation/scheduler/sche !! 436 - Documentation/scheduler/sched-design-CFS.txt (CFS)
958 - Documentation/admin-guide/cg !! 437 - Documentation/cgroups/ (features for grouping, isolation
959 and 438 and resource control)
960 439
961 Say N if unsure. 440 Say N if unsure.
962 441
963 if CGROUPS 442 if CGROUPS
964 443
965 config PAGE_COUNTER !! 444 config CGROUP_DEBUG
966 bool !! 445 bool "Example debug cgroup subsystem"
967 !! 446 depends on CGROUPS
968 config CGROUP_FAVOR_DYNMODS <<
969 bool "Favor dynamic modification laten <<
970 help <<
971 This option enables the "favordynmod <<
972 which reduces the latencies of dynam <<
973 as task migrations and controller on <<
974 hot path operations such as forks an <<
975 <<
976 Say N if unsure. <<
977 <<
978 config MEMCG <<
979 bool "Memory controller" <<
980 select PAGE_COUNTER <<
981 select EVENTFD <<
982 select SLAB_OBJ_EXT <<
983 help <<
984 Provides control over the memory foo <<
985 <<
986 config MEMCG_V1 <<
987 bool "Legacy cgroup v1 memory controll <<
988 depends on MEMCG <<
989 default n 447 default n
990 help 448 help
991 Legacy cgroup v1 memory controller w !! 449 This option enables a simple cgroup subsystem that
992 cgroup v2 implementation. The v1 is !! 450 exports useful debugging information about the cgroups
993 which haven't migrated to the new cg !! 451 framework.
994 do not have any such application the <<
995 this option disabled. <<
996 <<
997 Please note that feature set of the <<
998 going to shrink due to deprecation p <<
999 controller are highly discouraged. <<
1000 452
1001 Say N if unsure. 453 Say N if unsure.
1002 454
1003 config BLK_CGROUP !! 455 config CGROUP_NS
1004 bool "IO controller" !! 456 bool "Namespace cgroup subsystem"
1005 depends on BLOCK !! 457 depends on CGROUPS
1006 default n !! 458 help
1007 help !! 459 Provides a simple namespace cgroup subsystem to
1008 Generic block IO controller cgroup in !! 460 provide hierarchical naming of sets of namespaces,
1009 cgroup interface which should be used !! 461 for instance virtual servers and checkpoint/restart
1010 policies. !! 462 jobs.
1011 <<
1012 Currently, CFQ IO scheduler uses it t <<
1013 control disk bandwidth allocation (pr <<
1014 to such task groups. It is also used <<
1015 block layer to implement upper limit <<
1016 <<
1017 This option only enables generic Bloc <<
1018 One needs to also enable actual IO co <<
1019 enabling proportional weight division <<
1020 CONFIG_BFQ_GROUP_IOSCHED=y; for enabl <<
1021 CONFIG_BLK_DEV_THROTTLING=y. <<
1022 <<
1023 See Documentation/admin-guide/cgroup- <<
1024 <<
1025 config CGROUP_WRITEBACK <<
1026 bool <<
1027 depends on MEMCG && BLK_CGROUP <<
1028 default y <<
1029 <<
1030 menuconfig CGROUP_SCHED <<
1031 bool "CPU controller" <<
1032 default n <<
1033 help <<
1034 This feature lets CPU scheduler rec <<
1035 bandwidth allocation to such task g <<
1036 tasks. <<
1037 <<
1038 if CGROUP_SCHED <<
1039 config GROUP_SCHED_WEIGHT <<
1040 def_bool n <<
1041 <<
1042 config FAIR_GROUP_SCHED <<
1043 bool "Group scheduling for SCHED_OTHE <<
1044 depends on CGROUP_SCHED <<
1045 select GROUP_SCHED_WEIGHT <<
1046 default CGROUP_SCHED <<
1047 <<
1048 config CFS_BANDWIDTH <<
1049 bool "CPU bandwidth provisioning for <<
1050 depends on FAIR_GROUP_SCHED <<
1051 default n <<
1052 help <<
1053 This option allows users to define <<
1054 tasks running within the fair group <<
1055 set are considered to be unconstrai <<
1056 restriction. <<
1057 See Documentation/scheduler/sched-b <<
1058 <<
1059 config RT_GROUP_SCHED <<
1060 bool "Group scheduling for SCHED_RR/F <<
1061 depends on CGROUP_SCHED <<
1062 default n <<
1063 help <<
1064 This feature lets you explicitly al <<
1065 to task groups. If enabled, it will <<
1066 schedule realtime tasks for non-roo <<
1067 realtime bandwidth for them. <<
1068 See Documentation/scheduler/sched-r <<
1069 <<
1070 config EXT_GROUP_SCHED <<
1071 bool <<
1072 depends on SCHED_CLASS_EXT && CGROUP_ <<
1073 select GROUP_SCHED_WEIGHT <<
1074 default y <<
1075 <<
1076 endif #CGROUP_SCHED <<
1077 <<
1078 config SCHED_MM_CID <<
1079 def_bool y <<
1080 depends on SMP && RSEQ <<
1081 <<
1082 config UCLAMP_TASK_GROUP <<
1083 bool "Utilization clamping per group <<
1084 depends on CGROUP_SCHED <<
1085 depends on UCLAMP_TASK <<
1086 default n <<
1087 help <<
1088 This feature enables the scheduler <<
1089 of each CPU based on RUNNABLE tasks <<
1090 <<
1091 When this option is enabled, the us <<
1092 CPU bandwidth which is allowed for <<
1093 The max bandwidth allows to clamp t <<
1094 can use, while the min bandwidth al <<
1095 frequency a task will always use. <<
1096 <<
1097 When task group based utilization c <<
1098 specified task-specific clamp value <<
1099 specified clamp value. Both minimum <<
1100 be bigger than the corresponding cl <<
1101 <<
1102 If in doubt, say N. <<
1103 <<
1104 config CGROUP_PIDS <<
1105 bool "PIDs controller" <<
1106 help <<
1107 Provides enforcement of process num <<
1108 cgroup. Any attempt to fork more pr <<
1109 cgroup will fail. PIDs are fundamen <<
1110 is fairly trivial to reach PID exha <<
1111 conservative kmemcg limit. As a res <<
1112 system to halt without being limite <<
1113 PIDs controller is designed to stop <<
1114 <<
1115 It should be noted that organisatio <<
1116 to a cgroup hierarchy) will *not* b <<
1117 since the PIDs limit only affects a <<
1118 attach to a cgroup. <<
1119 <<
1120 config CGROUP_RDMA <<
1121 bool "RDMA controller" <<
1122 help <<
1123 Provides enforcement of RDMA resour <<
1124 It is fairly easy for consumers to <<
1125 can result into resource unavailabi <<
1126 RDMA controller is designed to stop <<
1127 Attaching processes with active RDM <<
1128 hierarchy is allowed even if can cr <<
1129 463
1130 config CGROUP_FREEZER 464 config CGROUP_FREEZER
1131 bool "Freezer controller" !! 465 bool "Freezer cgroup subsystem"
>> 466 depends on CGROUPS
1132 help 467 help
1133 Provides a way to freeze and unfree 468 Provides a way to freeze and unfreeze all tasks in a
1134 cgroup. 469 cgroup.
1135 470
1136 This option affects the ORIGINAL cg !! 471 config CGROUP_DEVICE
1137 controller includes important in-ke !! 472 bool "Device controller for cgroups"
1138 !! 473 depends on CGROUPS && EXPERIMENTAL
1139 If you're using cgroup2, say N. <<
1140 <<
1141 config CGROUP_HUGETLB <<
1142 bool "HugeTLB controller" <<
1143 depends on HUGETLB_PAGE <<
1144 select PAGE_COUNTER <<
1145 default n <<
1146 help 474 help
1147 Provides a cgroup controller for Hu !! 475 Provides a cgroup implementing whitelists for devices which
1148 When you enable this, you can put a !! 476 a process in the cgroup can mknod or open.
1149 The limit is enforced during page f <<
1150 support page reclaim, enforcing the <<
1151 that, the application will get SIGB <<
1152 HugeTLB pages beyond its limit. Thi <<
1153 beforehand how much HugeTLB pages i <<
1154 control group is tracked in the thi <<
1155 that we cannot use the controller w <<
1156 477
1157 config CPUSETS 478 config CPUSETS
1158 bool "Cpuset controller" !! 479 bool "Cpuset support"
1159 depends on SMP !! 480 depends on CGROUPS
1160 help 481 help
1161 This option will let you create and 482 This option will let you create and manage CPUSETs which
1162 allow dynamically partitioning a sy 483 allow dynamically partitioning a system into sets of CPUs and
1163 Memory Nodes and assigning tasks to 484 Memory Nodes and assigning tasks to run only within those sets.
1164 This is primarily useful on large S 485 This is primarily useful on large SMP or NUMA systems.
1165 486
1166 Say N if unsure. 487 Say N if unsure.
1167 488
1168 config CPUSETS_V1 <<
1169 bool "Legacy cgroup v1 cpusets contro <<
1170 depends on CPUSETS <<
1171 default n <<
1172 help <<
1173 Legacy cgroup v1 cpusets controller <<
1174 cgroup v2 implementation. The v1 is <<
1175 which haven't migrated to the new c <<
1176 do not have any such application th <<
1177 this option disabled. <<
1178 <<
1179 Say N if unsure. <<
1180 <<
1181 config PROC_PID_CPUSET 489 config PROC_PID_CPUSET
1182 bool "Include legacy /proc/<pid>/cpus 490 bool "Include legacy /proc/<pid>/cpuset file"
1183 depends on CPUSETS 491 depends on CPUSETS
1184 default y 492 default y
1185 493
1186 config CGROUP_DEVICE <<
1187 bool "Device controller" <<
1188 help <<
1189 Provides a cgroup controller implem <<
1190 devices which a process in the cgro <<
1191 <<
1192 config CGROUP_CPUACCT 494 config CGROUP_CPUACCT
1193 bool "Simple CPU accounting controlle !! 495 bool "Simple CPU accounting cgroup subsystem"
>> 496 depends on CGROUPS
1194 help 497 help
1195 Provides a simple controller for mo !! 498 Provides a simple Resource Controller for monitoring the
1196 total CPU consumed by the tasks in 499 total CPU consumed by the tasks in a cgroup.
1197 500
1198 config CGROUP_PERF !! 501 config RESOURCE_COUNTERS
1199 bool "Perf controller" !! 502 bool "Resource counters"
1200 depends on PERF_EVENTS !! 503 help
1201 help !! 504 This option enables controller independent resource accounting
1202 This option extends the perf per-cp !! 505 infrastructure that works with cgroups.
1203 to threads which belong to the cgro !! 506 depends on CGROUPS
1204 designated cpu. Or this can be use !! 507
1205 so that it can monitor performance !! 508 config CGROUP_MEM_RES_CTLR
>> 509 bool "Memory Resource Controller for Control Groups"
>> 510 depends on CGROUPS && RESOURCE_COUNTERS
>> 511 select MM_OWNER
>> 512 help
>> 513 Provides a memory resource controller that manages both anonymous
>> 514 memory and page cache. (See Documentation/cgroups/memory.txt)
>> 515
>> 516 Note that setting this option increases fixed memory overhead
>> 517 associated with each page of memory in the system. By this,
>> 518 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
>> 519 usage tracking struct at boot. Total amount of this is printed out
>> 520 at boot.
>> 521
>> 522 Only enable when you're ok with these trade offs and really
>> 523 sure you need the memory resource controller. Even when you enable
>> 524 this, you can set "cgroup_disable=memory" at your boot option to
>> 525 disable memory resource controller and you can avoid overheads.
>> 526 (and lose benefits of memory resource controller)
>> 527
>> 528 This config option also selects MM_OWNER config option, which
>> 529 could in turn add some fork/exit overhead.
>> 530
>> 531 config CGROUP_MEM_RES_CTLR_SWAP
>> 532 bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)"
>> 533 depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL
>> 534 help
>> 535 Add swap management feature to memory resource controller. When you
>> 536 enable this, you can limit mem+swap usage per cgroup. In other words,
>> 537 when you disable this, memory resource controller has no cares to
>> 538 usage of swap...a process can exhaust all of the swap. This extension
>> 539 is useful when you want to avoid exhaustion swap but this itself
>> 540 adds more overheads and consumes memory for remembering information.
>> 541 Especially if you use 32bit system or small memory system, please
>> 542 be careful about enabling this. When memory resource controller
>> 543 is disabled by boot option, this will be automatically disabled and
>> 544 there will be no overhead from this. Even when you set this config=y,
>> 545 if boot option "noswapaccount" is set, swap will not be accounted.
>> 546 Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
>> 547 size is 4096bytes, 512k per 1Gbytes of swap.
1206 548
1207 Say N if unsure. !! 549 menuconfig CGROUP_SCHED
>> 550 bool "Group CPU scheduler"
>> 551 depends on EXPERIMENTAL && CGROUPS
>> 552 default n
>> 553 help
>> 554 This feature lets CPU scheduler recognize task groups and control CPU
>> 555 bandwidth allocation to such task groups. It uses cgroups to group
>> 556 tasks.
1208 557
1209 config CGROUP_BPF !! 558 if CGROUP_SCHED
1210 bool "Support for eBPF programs attac !! 559 config FAIR_GROUP_SCHED
1211 depends on BPF_SYSCALL !! 560 bool "Group scheduling for SCHED_OTHER"
1212 select SOCK_CGROUP_DATA !! 561 depends on CGROUP_SCHED
1213 help !! 562 default CGROUP_SCHED
1214 Allow attaching eBPF programs to a <<
1215 syscall command BPF_PROG_ATTACH. <<
1216 <<
1217 In which context these programs are <<
1218 of attachment. For instance, progra <<
1219 BPF_CGROUP_INET_INGRESS will be exe <<
1220 inet sockets. <<
1221 563
1222 config CGROUP_MISC !! 564 config RT_GROUP_SCHED
1223 bool "Misc resource controller" !! 565 bool "Group scheduling for SCHED_RR/FIFO"
>> 566 depends on EXPERIMENTAL
>> 567 depends on CGROUP_SCHED
1224 default n 568 default n
1225 help 569 help
1226 Provides a controller for miscellan !! 570 This feature lets you explicitly allocate real CPU bandwidth
>> 571 to task groups. If enabled, it will also make it impossible to
>> 572 schedule realtime tasks for non-root users until you allocate
>> 573 realtime bandwidth for them.
>> 574 See Documentation/scheduler/sched-rt-group.txt for more information.
>> 575
>> 576 endif #CGROUP_SCHED
1227 577
1228 Miscellaneous scalar resources are !! 578 endif # CGROUPS
1229 which cannot be abstracted like the <<
1230 tracks and limits the miscellaneous <<
1231 attached to a cgroup hierarchy. <<
1232 579
1233 For more information, please check !! 580 config MM_OWNER
1234 /Documentation/admin-guide/cgroup-v !! 581 bool
1235 582
1236 config CGROUP_DEBUG !! 583 config SYSFS_DEPRECATED
1237 bool "Debug controller" !! 584 bool
>> 585
>> 586 config SYSFS_DEPRECATED_V2
>> 587 bool "enable deprecated sysfs features which may confuse old userspace tools"
>> 588 depends on SYSFS
1238 default n 589 default n
1239 depends on DEBUG_KERNEL !! 590 select SYSFS_DEPRECATED
1240 help 591 help
1241 This option enables a simple contro !! 592 This option switches the layout of sysfs to the deprecated
1242 debugging information about the cgr !! 593 version. Do not use it on recent distributions.
1243 controller is for control cgroup de <<
1244 interfaces are not stable. <<
1245 594
1246 Say N. !! 595 The current sysfs layout features a unified device tree at
>> 596 /sys/devices/, which is able to express a hierarchy between
>> 597 class devices. If the deprecated option is set to Y, the
>> 598 unified device tree is split into a bus device tree at
>> 599 /sys/devices/ and several individual class device trees at
>> 600 /sys/class/. The class and bus devices will be connected by
>> 601 "<subsystem>:<name>" and the "device" links. The "block"
>> 602 class devices, will not show up in /sys/class/block/. Some
>> 603 subsystems will suppress the creation of some devices which
>> 604 depend on the unified device tree.
>> 605
>> 606 This option is not a pure compatibility option that can
>> 607 be safely enabled on newer distributions. It will change the
>> 608 layout of sysfs to the non-extensible deprecated version,
>> 609 and disable some features, which can not be exported without
>> 610 confusing older userspace tools. Since 2007/2008 all major
>> 611 distributions do not enable this option, and ship no tools which
>> 612 depend on the deprecated layout or this option.
>> 613
>> 614 If you are using a new kernel on an older distribution, or use
>> 615 older userspace tools, you might need to say Y here. Do not say Y,
>> 616 if the original kernel, that came with your distribution, has
>> 617 this option set to N.
1247 618
1248 config SOCK_CGROUP_DATA !! 619 config RELAY
1249 bool !! 620 bool "Kernel->user space relay support (formerly relayfs)"
1250 default n !! 621 help
>> 622 This option enables support for relay interface support in
>> 623 certain file systems (such as debugfs).
>> 624 It is designed to provide an efficient mechanism for tools and
>> 625 facilities to relay large amounts of data from kernel space to
>> 626 user space.
1251 627
1252 endif # CGROUPS !! 628 If unsure, say N.
1253 629
1254 menuconfig NAMESPACES !! 630 config NAMESPACES
1255 bool "Namespaces support" if EXPERT !! 631 bool "Namespaces support" if EMBEDDED
1256 depends on MULTIUSER !! 632 default !EMBEDDED
1257 default !EXPERT <<
1258 help 633 help
1259 Provides the way to make tasks work 634 Provides the way to make tasks work with different objects using
1260 the same id. For example same IPC i 635 the same id. For example same IPC id may refer to different objects
1261 or same user id or pid may refer to 636 or same user id or pid may refer to different tasks when used in
1262 different namespaces. 637 different namespaces.
1263 638
1264 if NAMESPACES <<
1265 <<
1266 config UTS_NS 639 config UTS_NS
1267 bool "UTS namespace" 640 bool "UTS namespace"
1268 default y !! 641 depends on NAMESPACES
1269 help 642 help
1270 In this namespace tasks see differe 643 In this namespace tasks see different info provided with the
1271 uname() system call 644 uname() system call
1272 645
1273 config TIME_NS <<
1274 bool "TIME namespace" <<
1275 depends on GENERIC_VDSO_TIME_NS <<
1276 default y <<
1277 help <<
1278 In this namespace boottime and mono <<
1279 The time will keep going with the s <<
1280 <<
1281 config IPC_NS 646 config IPC_NS
1282 bool "IPC namespace" 647 bool "IPC namespace"
1283 depends on (SYSVIPC || POSIX_MQUEUE) !! 648 depends on NAMESPACES && (SYSVIPC || POSIX_MQUEUE)
1284 default y <<
1285 help 649 help
1286 In this namespace tasks work with I 650 In this namespace tasks work with IPC ids which correspond to
1287 different IPC objects in different 651 different IPC objects in different namespaces.
1288 652
1289 config USER_NS 653 config USER_NS
1290 bool "User namespace" !! 654 bool "User namespace (EXPERIMENTAL)"
1291 default n !! 655 depends on NAMESPACES && EXPERIMENTAL
1292 help 656 help
1293 This allows containers, i.e. vserve 657 This allows containers, i.e. vservers, to use user namespaces
1294 to provide different user info for 658 to provide different user info for different servers.
1295 <<
1296 When user namespaces are enabled in <<
1297 recommended that the MEMCG option a <<
1298 user-space use the memory control g <<
1299 of memory a memory unprivileged use <<
1300 <<
1301 If unsure, say N. 659 If unsure, say N.
1302 660
1303 config PID_NS 661 config PID_NS
1304 bool "PID Namespaces" !! 662 bool "PID Namespaces (EXPERIMENTAL)"
1305 default y !! 663 default n
>> 664 depends on NAMESPACES && EXPERIMENTAL
1306 help 665 help
1307 Support process id namespaces. Thi 666 Support process id namespaces. This allows having multiple
1308 processes with the same pid as long 667 processes with the same pid as long as they are in different
1309 pid namespaces. This is a building 668 pid namespaces. This is a building block of containers.
1310 669
>> 670 Unless you want to work with an experimental feature
>> 671 say N here.
>> 672
1311 config NET_NS 673 config NET_NS
1312 bool "Network namespace" 674 bool "Network namespace"
1313 depends on NET !! 675 default n
1314 default y !! 676 depends on NAMESPACES && EXPERIMENTAL && NET
1315 help 677 help
1316 Allow user space to create what app 678 Allow user space to create what appear to be multiple instances
1317 of the network stack. 679 of the network stack.
1318 680
1319 endif # NAMESPACES <<
1320 <<
1321 config CHECKPOINT_RESTORE <<
1322 bool "Checkpoint/restore support" <<
1323 depends on PROC_FS <<
1324 select PROC_CHILDREN <<
1325 select KCMP <<
1326 default n <<
1327 help <<
1328 Enables additional kernel features <<
1329 In particular it adds auxiliary prc <<
1330 data and heap segment sizes, and a <<
1331 entries. <<
1332 <<
1333 If unsure, say N here. <<
1334 <<
1335 config SCHED_AUTOGROUP <<
1336 bool "Automatic process group schedul <<
1337 select CGROUPS <<
1338 select CGROUP_SCHED <<
1339 select FAIR_GROUP_SCHED <<
1340 help <<
1341 This option optimizes the scheduler <<
1342 automatically creating and populati <<
1343 of workloads isolates aggressive CP <<
1344 desktop applications. Task group a <<
1345 upon task session. <<
1346 <<
1347 config RELAY <<
1348 bool "Kernel->user space relay suppor <<
1349 select IRQ_WORK <<
1350 help <<
1351 This option enables support for rel <<
1352 certain file systems (such as debug <<
1353 It is designed to provide an effici <<
1354 facilities to relay large amounts o <<
1355 user space. <<
1356 <<
1357 If unsure, say N. <<
1358 <<
1359 config BLK_DEV_INITRD 681 config BLK_DEV_INITRD
1360 bool "Initial RAM filesystem and RAM 682 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
>> 683 depends on BROKEN || !FRV
1361 help 684 help
1362 The initial RAM filesystem is a ram 685 The initial RAM filesystem is a ramfs which is loaded by the
1363 boot loader (loadlin or lilo) and t 686 boot loader (loadlin or lilo) and that is mounted as root
1364 before the normal boot procedure. I 687 before the normal boot procedure. It is typically used to
1365 load modules needed to mount the "r 688 load modules needed to mount the "real" root file system,
1366 etc. See <file:Documentation/admin- !! 689 etc. See <file:Documentation/initrd.txt> for details.
1367 690
1368 If RAM disk support (BLK_DEV_RAM) i 691 If RAM disk support (BLK_DEV_RAM) is also included, this
1369 also enables initial RAM disk (init 692 also enables initial RAM disk (initrd) support and adds
1370 15 Kbytes (more on some other archi 693 15 Kbytes (more on some other architectures) to the kernel size.
1371 694
1372 If unsure say Y. 695 If unsure say Y.
1373 696
1374 if BLK_DEV_INITRD 697 if BLK_DEV_INITRD
1375 698
1376 source "usr/Kconfig" 699 source "usr/Kconfig"
1377 700
1378 endif 701 endif
1379 702
1380 config BOOT_CONFIG !! 703 config CC_OPTIMIZE_FOR_SIZE
1381 bool "Boot config support" !! 704 bool "Optimize for size"
1382 select BLK_DEV_INITRD if !BOOT_CONFIG <<
1383 help <<
1384 Extra boot config allows system adm <<
1385 complemental extension of kernel cm <<
1386 The boot config file must be attach <<
1387 with checksum, size and magic word. <<
1388 See <file:Documentation/admin-guide <<
1389 <<
1390 If unsure, say Y. <<
1391 <<
1392 config BOOT_CONFIG_FORCE <<
1393 bool "Force unconditional bootconfig <<
1394 depends on BOOT_CONFIG <<
1395 default y if BOOT_CONFIG_EMBED <<
1396 help <<
1397 With this Kconfig option set, BOOT_ <<
1398 out even when the "bootconfig" kern <<
1399 In fact, with this Kconfig option s <<
1400 make the kernel ignore the BOOT_CON <<
1401 parameters. <<
1402 <<
1403 If unsure, say N. <<
1404 <<
1405 config BOOT_CONFIG_EMBED <<
1406 bool "Embed bootconfig file in the ke <<
1407 depends on BOOT_CONFIG <<
1408 help <<
1409 Embed a bootconfig file given by BO <<
1410 kernel. Usually, the bootconfig fil <<
1411 image. But if the system doesn't su <<
1412 help you by embedding a bootconfig <<
1413 <<
1414 If unsure, say N. <<
1415 <<
1416 config BOOT_CONFIG_EMBED_FILE <<
1417 string "Embedded bootconfig file path <<
1418 depends on BOOT_CONFIG_EMBED <<
1419 help <<
1420 Specify a bootconfig file which wil <<
1421 This bootconfig will be used if the <<
1422 bootconfig in the initrd. <<
1423 <<
1424 config INITRAMFS_PRESERVE_MTIME <<
1425 bool "Preserve cpio archive mtimes in <<
1426 default y 705 default y
1427 help 706 help
1428 Each entry in an initramfs cpio arc !! 707 Enabling this option will pass "-Os" instead of "-O2" to gcc
1429 enabled, extracted cpio items take !! 708 resulting in a smaller kernel.
1430 setting deferred until after creati <<
1431 709
1432 If unsure, say Y. 710 If unsure, say Y.
1433 711
1434 choice <<
1435 prompt "Compiler optimization level" <<
1436 default CC_OPTIMIZE_FOR_PERFORMANCE <<
1437 <<
1438 config CC_OPTIMIZE_FOR_PERFORMANCE <<
1439 bool "Optimize for performance (-O2)" <<
1440 help <<
1441 This is the default optimization le <<
1442 with the "-O2" compiler flag for be <<
1443 helpful compile-time warnings. <<
1444 <<
1445 config CC_OPTIMIZE_FOR_SIZE <<
1446 bool "Optimize for size (-Os)" <<
1447 help <<
1448 Choosing this option will pass "-Os <<
1449 in a smaller kernel. <<
1450 <<
1451 endchoice <<
1452 <<
1453 config HAVE_LD_DEAD_CODE_DATA_ELIMINATION <<
1454 bool <<
1455 help <<
1456 This requires that the arch annotat <<
1457 its external entry points from bein <<
1458 must also merge .text.*, .data.*, a <<
1459 output sections. Care must be taken <<
1460 sections (e.g., '.text.init'). Typi <<
1461 is used to distinguish them from la <<
1462 <<
1463 config LD_DEAD_CODE_DATA_ELIMINATION <<
1464 bool "Dead code and data elimination <<
1465 depends on HAVE_LD_DEAD_CODE_DATA_ELI <<
1466 depends on EXPERT <<
1467 depends on $(cc-option,-ffunction-sec <<
1468 depends on $(ld-option,--gc-sections) <<
1469 help <<
1470 Enable this if you want to do dead <<
1471 the linker by compiling with -ffunc <<
1472 and linking with --gc-sections. <<
1473 <<
1474 This can reduce on disk and in-memo <<
1475 code and static data, particularly <<
1476 on small systems. This has the poss <<
1477 silently broken kernel if the requi <<
1478 present. This option is not well te <<
1479 own risk. <<
1480 <<
1481 config LD_ORPHAN_WARN <<
1482 def_bool y <<
1483 depends on ARCH_WANT_LD_ORPHAN_WARN <<
1484 depends on $(ld-option,--orphan-handl <<
1485 depends on $(ld-option,--orphan-handl <<
1486 <<
1487 config LD_ORPHAN_WARN_LEVEL <<
1488 string <<
1489 depends on LD_ORPHAN_WARN <<
1490 default "error" if WERROR <<
1491 default "warn" <<
1492 <<
1493 config SYSCTL 712 config SYSCTL
1494 bool 713 bool
1495 714
1496 config HAVE_UID16 !! 715 config ANON_INODES
1497 bool <<
1498 <<
1499 config SYSCTL_EXCEPTION_TRACE <<
1500 bool <<
1501 help <<
1502 Enable support for /proc/sys/debug/ <<
1503 <<
1504 config SYSCTL_ARCH_UNALIGN_NO_WARN <<
1505 bool <<
1506 help <<
1507 Enable support for /proc/sys/kernel <<
1508 Allows arch to define/use @no_unali <<
1509 about unaligned access emulation go <<
1510 <<
1511 config SYSCTL_ARCH_UNALIGN_ALLOW <<
1512 bool <<
1513 help <<
1514 Enable support for /proc/sys/kernel <<
1515 Allows arches to define/use @unalig <<
1516 the unaligned access emulation. <<
1517 see arch/parisc/kernel/unaligned.c <<
1518 <<
1519 config HAVE_PCSPKR_PLATFORM <<
1520 bool 716 bool
1521 717
1522 menuconfig EXPERT !! 718 menuconfig EMBEDDED
1523 bool "Configure standard kernel featu !! 719 bool "Configure standard kernel features (for small systems)"
1524 # Unhide debug options, to make the o <<
1525 select DEBUG_KERNEL <<
1526 help 720 help
1527 This option allows certain base ker 721 This option allows certain base kernel options and settings
1528 to be disabled or tweaked. This is !! 722 to be disabled or tweaked. This is for specialized
1529 environments which can tolerate a " !! 723 environments which can tolerate a "non-standard" kernel.
1530 Only use this if you really know wh !! 724 Only use this if you really know what you are doing.
1531 725
1532 config UID16 726 config UID16
1533 bool "Enable 16-bit UID system calls" !! 727 bool "Enable 16-bit UID system calls" if EMBEDDED
1534 depends on HAVE_UID16 && MULTIUSER !! 728 depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
1535 default y 729 default y
1536 help 730 help
1537 This enables the legacy 16-bit UID 731 This enables the legacy 16-bit UID syscall wrappers.
1538 732
1539 config MULTIUSER !! 733 config SYSCTL_SYSCALL
1540 bool "Multiple users, groups and capa !! 734 bool "Sysctl syscall support" if EMBEDDED
1541 default y 735 default y
1542 help !! 736 select SYSCTL
1543 This option enables support for non !! 737 ---help---
1544 capabilities. !! 738 sys_sysctl uses binary paths that have been found challenging
>> 739 to properly maintain and use. The interface in /proc/sys
>> 740 using paths with ascii names is now the primary path to this
>> 741 information.
>> 742
>> 743 Almost nothing using the binary sysctl interface so if you are
>> 744 trying to save some space it is probably safe to disable this,
>> 745 making your kernel marginally smaller.
1545 746
1546 If you say N here, all processes wi !! 747 If unsure say Y here.
1547 possible capabilities. Saying N he <<
1548 system calls related to UIDs, GIDs, <<
1549 setgid, and capset. <<
1550 748
1551 If unsure, say Y here. !! 749 config KALLSYMS
>> 750 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
>> 751 default y
>> 752 help
>> 753 Say Y here to let the kernel print out symbolic crash information and
>> 754 symbolic stack backtraces. This increases the size of the kernel
>> 755 somewhat, as all symbols have to be loaded into the kernel image.
1552 756
1553 config SGETMASK_SYSCALL !! 757 config KALLSYMS_ALL
1554 bool "sgetmask/ssetmask syscalls supp !! 758 bool "Include all symbols in kallsyms"
1555 default PARISC || M68K || PPC || MIPS !! 759 depends on DEBUG_KERNEL && KALLSYMS
1556 help 760 help
1557 sys_sgetmask and sys_ssetmask are o !! 761 Normally kallsyms only contains the symbols of functions, for nicer
1558 no longer supported in libc but sti !! 762 OOPS messages. Some debuggers can use kallsyms for other
1559 architectures. !! 763 symbols too: say Y here to include all symbols, if you need them
>> 764 and you don't care about adding 300k to the size of your kernel.
1560 765
1561 If unsure, leave the default option !! 766 Say N.
1562 767
1563 config SYSFS_SYSCALL !! 768 config KALLSYMS_EXTRA_PASS
1564 bool "Sysfs syscall support" if EXPER !! 769 bool "Do an extra kallsyms pass"
1565 default y !! 770 depends on KALLSYMS
1566 help 771 help
1567 sys_sysfs is an obsolete system cal !! 772 If kallsyms is not working correctly, the build will fail with
1568 Note that disabling this option is !! 773 inconsistent kallsyms data. If that occurs, log a bug report and
1569 compatibility with some systems. !! 774 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
1570 !! 775 Always say N here unless you find a bug in kallsyms, which must be
1571 If unsure say Y here. !! 776 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
1572 !! 777 you wait for kallsyms to be fixed.
1573 config FHANDLE !! 778
1574 bool "open by fhandle syscalls" if EX !! 779
1575 select EXPORTFS !! 780 config HOTPLUG
1576 default y !! 781 bool "Support for hot-pluggable devices" if EMBEDDED
1577 help !! 782 default y
1578 If you say Y here, a user level pro !! 783 help
1579 file names to handle and then later !! 784 This option is provided for the case where no hotplug or uevent
1580 different file system operations. T !! 785 capabilities is wanted by the kernel. You should only consider
1581 userspace file servers, which now t !! 786 disabling this option for embedded systems that do not use modules, a
1582 of names. The handle would remain t !! 787 dynamic /dev tree, or dynamic device discovery. Just say Y.
1583 get renamed. Enables open_by_handle <<
1584 syscalls. <<
1585 <<
1586 config POSIX_TIMERS <<
1587 bool "Posix Clocks & timers" if EXPER <<
1588 default y <<
1589 help <<
1590 This includes native support for PO <<
1591 Some embedded systems have no use f <<
1592 can be configured out to reduce the <<
1593 <<
1594 When this option is disabled, the f <<
1595 available: timer_create, timer_gett <<
1596 timer_settime, timer_delete, clock_ <<
1597 setitimer, alarm. Furthermore, the <<
1598 clock_getres and clock_nanosleep sy <<
1599 CLOCK_REALTIME, CLOCK_MONOTONIC and <<
1600 <<
1601 If unsure say y. <<
1602 788
1603 config PRINTK 789 config PRINTK
1604 default y 790 default y
1605 bool "Enable support for printk" if E !! 791 bool "Enable support for printk" if EMBEDDED
1606 select IRQ_WORK <<
1607 help 792 help
1608 This option enables normal printk s 793 This option enables normal printk support. Removing it
1609 eliminates most of the message stri 794 eliminates most of the message strings from the kernel image
1610 and makes the kernel more or less s 795 and makes the kernel more or less silent. As this makes it
1611 very difficult to diagnose system p 796 very difficult to diagnose system problems, saying N here is
1612 strongly discouraged. 797 strongly discouraged.
1613 798
1614 config BUG 799 config BUG
1615 bool "BUG() support" if EXPERT !! 800 bool "BUG() support" if EMBEDDED
1616 default y 801 default y
1617 help 802 help
1618 Disabling this option eliminates su !! 803 Disabling this option eliminates support for BUG and WARN, reducing
1619 the size of your kernel image and p !! 804 the size of your kernel image and potentially quietly ignoring
1620 numerous fatal conditions. You shou !! 805 numerous fatal conditions. You should only consider disabling this
1621 option for embedded systems with no !! 806 option for embedded systems with no facilities for reporting errors.
1622 Just say Y. !! 807 Just say Y.
1623 808
1624 config ELF_CORE 809 config ELF_CORE
1625 depends on COREDUMP <<
1626 default y 810 default y
1627 bool "Enable ELF core dumps" if EXPER !! 811 bool "Enable ELF core dumps" if EMBEDDED
1628 help 812 help
1629 Enable support for generating core 813 Enable support for generating core dumps. Disabling saves about 4k.
1630 814
1631 <<
1632 config PCSPKR_PLATFORM 815 config PCSPKR_PLATFORM
1633 bool "Enable PC-Speaker support" if E !! 816 bool "Enable PC-Speaker support" if EMBEDDED
1634 depends on HAVE_PCSPKR_PLATFORM !! 817 depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
1635 select I8253_LOCK <<
1636 default y 818 default y
1637 help 819 help
1638 This option allows to disable the i !! 820 This option allows to disable the internal PC-Speaker
1639 support, saving some memory. !! 821 support, saving some memory.
1640 822
1641 config BASE_SMALL !! 823 config BASE_FULL
1642 bool "Enable smaller-sized data struc !! 824 default y
>> 825 bool "Enable full-sized data structures for core" if EMBEDDED
1643 help 826 help
1644 Enabling this option reduces the si !! 827 Disabling this option reduces the size of miscellaneous core
1645 kernel data structures. This saves 828 kernel data structures. This saves memory on small machines,
1646 but may reduce performance. 829 but may reduce performance.
1647 830
1648 config FUTEX 831 config FUTEX
1649 bool "Enable futex support" if EXPERT !! 832 bool "Enable futex support" if EMBEDDED
1650 depends on !(SPARC32 && SMP) <<
1651 default y 833 default y
1652 imply RT_MUTEXES !! 834 select RT_MUTEXES
1653 help 835 help
1654 Disabling this option will cause th 836 Disabling this option will cause the kernel to be built without
1655 support for "fast userspace mutexes 837 support for "fast userspace mutexes". The resulting kernel may not
1656 run glibc-based applications correc 838 run glibc-based applications correctly.
1657 839
1658 config FUTEX_PI <<
1659 bool <<
1660 depends on FUTEX && RT_MUTEXES <<
1661 default y <<
1662 <<
1663 config EPOLL 840 config EPOLL
1664 bool "Enable eventpoll support" if EX !! 841 bool "Enable eventpoll support" if EMBEDDED
1665 default y 842 default y
>> 843 select ANON_INODES
1666 help 844 help
1667 Disabling this option will cause th 845 Disabling this option will cause the kernel to be built without
1668 support for epoll family of system 846 support for epoll family of system calls.
1669 847
1670 config SIGNALFD 848 config SIGNALFD
1671 bool "Enable signalfd() system call" !! 849 bool "Enable signalfd() system call" if EMBEDDED
>> 850 select ANON_INODES
1672 default y 851 default y
1673 help 852 help
1674 Enable the signalfd() system call t 853 Enable the signalfd() system call that allows to receive signals
1675 on a file descriptor. 854 on a file descriptor.
1676 855
1677 If unsure, say Y. 856 If unsure, say Y.
1678 857
1679 config TIMERFD 858 config TIMERFD
1680 bool "Enable timerfd() system call" i !! 859 bool "Enable timerfd() system call" if EMBEDDED
>> 860 select ANON_INODES
1681 default y 861 default y
1682 help 862 help
1683 Enable the timerfd() system call th 863 Enable the timerfd() system call that allows to receive timer
1684 events on a file descriptor. 864 events on a file descriptor.
1685 865
1686 If unsure, say Y. 866 If unsure, say Y.
1687 867
1688 config EVENTFD 868 config EVENTFD
1689 bool "Enable eventfd() system call" i !! 869 bool "Enable eventfd() system call" if EMBEDDED
>> 870 select ANON_INODES
1690 default y 871 default y
1691 help 872 help
1692 Enable the eventfd() system call th 873 Enable the eventfd() system call that allows to receive both
1693 kernel notification (ie. KAIO) or u 874 kernel notification (ie. KAIO) or userspace notifications.
1694 875
1695 If unsure, say Y. 876 If unsure, say Y.
1696 877
1697 config SHMEM 878 config SHMEM
1698 bool "Use full shmem filesystem" if E !! 879 bool "Use full shmem filesystem" if EMBEDDED
1699 default y 880 default y
1700 depends on MMU 881 depends on MMU
1701 help 882 help
1702 The shmem is an internal filesystem 883 The shmem is an internal filesystem used to manage shared memory.
1703 It is backed by swap and manages re 884 It is backed by swap and manages resource limits. It is also exported
1704 to userspace as tmpfs if TMPFS is e 885 to userspace as tmpfs if TMPFS is enabled. Disabling this
1705 option replaces shmem and tmpfs wit 886 option replaces shmem and tmpfs with the much simpler ramfs code,
1706 which may be appropriate on small s 887 which may be appropriate on small systems without swap.
1707 888
1708 config AIO 889 config AIO
1709 bool "Enable AIO support" if EXPERT !! 890 bool "Enable AIO support" if EMBEDDED
1710 default y 891 default y
1711 help 892 help
1712 This option enables POSIX asynchron 893 This option enables POSIX asynchronous I/O which may by used
1713 by some high performance threaded a !! 894 by some high performance threaded applications. Disabling
1714 this option saves about 7k. !! 895 this option saves about 7k.
1715 <<
1716 config IO_URING <<
1717 bool "Enable IO uring support" if EXP <<
1718 select IO_WQ <<
1719 default y <<
1720 help <<
1721 This option enables support for the <<
1722 applications to submit and complete <<
1723 completion rings that are shared be <<
1724 <<
1725 config GCOV_PROFILE_URING <<
1726 bool "Enable GCOV profiling on the io <<
1727 depends on GCOV_KERNEL <<
1728 help <<
1729 Enable GCOV profiling on the io_uri <<
1730 code coverage testing. <<
1731 <<
1732 If unsure, say N. <<
1733 <<
1734 Note that this will have a negative <<
1735 the io_uring subsystem, hence this <<
1736 specific test purposes. <<
1737 <<
1738 config ADVISE_SYSCALLS <<
1739 bool "Enable madvise/fadvise syscalls <<
1740 default y <<
1741 help <<
1742 This option enables the madvise and <<
1743 applications to advise the kernel a <<
1744 usage, improving performance. If bu <<
1745 applications use these syscalls, yo <<
1746 space. <<
1747 <<
1748 config MEMBARRIER <<
1749 bool "Enable membarrier() system call <<
1750 default y <<
1751 help <<
1752 Enable the membarrier() system call <<
1753 barriers across all running threads <<
1754 the cost of user-space memory barri <<
1755 pairs of memory barriers into pairs <<
1756 compiler barrier. <<
1757 <<
1758 If unsure, say Y. <<
1759 <<
1760 config KCMP <<
1761 bool "Enable kcmp() system call" if E <<
1762 help <<
1763 Enable the kernel resource comparis <<
1764 user-space with the ability to comp <<
1765 share a common resource, such as a <<
1766 memory space. <<
1767 <<
1768 If unsure, say N. <<
1769 <<
1770 config RSEQ <<
1771 bool "Enable rseq() system call" if E <<
1772 default y <<
1773 depends on HAVE_RSEQ <<
1774 select MEMBARRIER <<
1775 help <<
1776 Enable the restartable sequences sy <<
1777 user-space cache for the current CP <<
1778 speeds up getting the current CPU n <<
1779 as well as an ABI to speed up user- <<
1780 per-CPU data. <<
1781 <<
1782 If unsure, say Y. <<
1783 <<
1784 config DEBUG_RSEQ <<
1785 default n <<
1786 bool "Enable debugging of rseq() syst <<
1787 depends on RSEQ && DEBUG_KERNEL <<
1788 help <<
1789 Enable extra debugging checks for t <<
1790 <<
1791 If unsure, say N. <<
1792 <<
1793 config CACHESTAT_SYSCALL <<
1794 bool "Enable cachestat() system call" <<
1795 default y <<
1796 help <<
1797 Enable the cachestat system call, w <<
1798 statistics of a file (number of cac <<
1799 pages marked for writeback, (recent <<
1800 <<
1801 If unsure say Y here. <<
1802 <<
1803 config PC104 <<
1804 bool "PC/104 support" if EXPERT <<
1805 help <<
1806 Expose PC/104 form factor device dr <<
1807 selection and configuration. Enable <<
1808 machine has a PC/104 bus. <<
1809 <<
1810 config KALLSYMS <<
1811 bool "Load all symbols for debugging/ <<
1812 default y <<
1813 help <<
1814 Say Y here to let the kernel print <<
1815 symbolic stack backtraces. This inc <<
1816 somewhat, as all symbols have to be <<
1817 <<
1818 config KALLSYMS_SELFTEST <<
1819 bool "Test the basic functions and pe <<
1820 depends on KALLSYMS <<
1821 default n <<
1822 help <<
1823 Test the basic functions and perfor <<
1824 kallsyms_lookup_name. It also calcu <<
1825 kallsyms compression algorithm for <<
1826 <<
1827 Start self-test automatically after <<
1828 "dmesg | grep kallsyms_selftest" to <<
1829 displayed in the last line, indicat <<
1830 <<
1831 config KALLSYMS_ALL <<
1832 bool "Include all symbols in kallsyms <<
1833 depends on DEBUG_KERNEL && KALLSYMS <<
1834 help <<
1835 Normally kallsyms only contains the <<
1836 OOPS messages and backtraces (i.e., <<
1837 sections). This is sufficient for m <<
1838 enable kernel live patching, or oth <<
1839 when a debugger is used) all symbol <<
1840 variables from the data sections, e <<
1841 <<
1842 This option makes sure that all sym <<
1843 image (i.e., symbols from all secti <<
1844 size (depending on the kernel confi <<
1845 something like this). <<
1846 <<
1847 Say N unless you really need all sy <<
1848 <<
1849 config KALLSYMS_ABSOLUTE_PERCPU <<
1850 bool <<
1851 depends on KALLSYMS <<
1852 default X86_64 && SMP <<
1853 <<
1854 # end of the "standard kernel features (exper <<
1855 <<
1856 config ARCH_HAS_MEMBARRIER_CALLBACKS <<
1857 bool <<
1858 <<
1859 config ARCH_HAS_MEMBARRIER_SYNC_CORE <<
1860 bool <<
1861 896
1862 config HAVE_PERF_EVENTS 897 config HAVE_PERF_EVENTS
1863 bool 898 bool
1864 help 899 help
1865 See tools/perf/design.txt for detai 900 See tools/perf/design.txt for details.
1866 901
1867 config GUEST_PERF_EVENTS <<
1868 bool <<
1869 depends on HAVE_PERF_EVENTS <<
1870 <<
1871 config PERF_USE_VMALLOC 902 config PERF_USE_VMALLOC
1872 bool 903 bool
1873 help 904 help
1874 See tools/perf/design.txt for detai 905 See tools/perf/design.txt for details
1875 906
1876 menu "Kernel Performance Events And Counters" 907 menu "Kernel Performance Events And Counters"
1877 908
1878 config PERF_EVENTS 909 config PERF_EVENTS
1879 bool "Kernel performance events and c 910 bool "Kernel performance events and counters"
1880 default y if PROFILING !! 911 default y if (PROFILING || PERF_COUNTERS)
1881 depends on HAVE_PERF_EVENTS 912 depends on HAVE_PERF_EVENTS
1882 select IRQ_WORK !! 913 select ANON_INODES
1883 help 914 help
1884 Enable kernel support for various p 915 Enable kernel support for various performance events provided
1885 by software and hardware. 916 by software and hardware.
1886 917
1887 Software events are supported eithe 918 Software events are supported either built-in or via the
1888 use of generic tracepoints. 919 use of generic tracepoints.
1889 920
1890 Most modern CPUs support performanc 921 Most modern CPUs support performance events via performance
1891 counter registers. These registers 922 counter registers. These registers count the number of certain
1892 types of hw events: such as instruc 923 types of hw events: such as instructions executed, cachemisses
1893 suffered, or branches mis-predicted 924 suffered, or branches mis-predicted - without slowing down the
1894 kernel or applications. These regis 925 kernel or applications. These registers can also trigger interrupts
1895 when a threshold number of events h 926 when a threshold number of events have passed - and can thus be
1896 used to profile the code that runs 927 used to profile the code that runs on that CPU.
1897 928
1898 The Linux Performance Event subsyst 929 The Linux Performance Event subsystem provides an abstraction of
1899 these software and hardware event c 930 these software and hardware event capabilities, available via a
1900 system call and used by the "perf" 931 system call and used by the "perf" utility in tools/perf/. It
1901 provides per task and per CPU count 932 provides per task and per CPU counters, and it provides event
1902 capabilities on top of those. 933 capabilities on top of those.
1903 934
1904 Say Y if unsure. 935 Say Y if unsure.
1905 936
>> 937 config EVENT_PROFILE
>> 938 bool "Tracepoint profiling sources"
>> 939 depends on PERF_EVENTS && EVENT_TRACING
>> 940 default y
>> 941 help
>> 942 Allow the use of tracepoints as software performance events.
>> 943
>> 944 When this is enabled, you can create perf events based on
>> 945 tracepoints using PERF_TYPE_TRACEPOINT and the tracepoint ID
>> 946 found in debugfs://tracing/events/*/*/id. (The -e/--events
>> 947 option to the perf tool can parse and interpret symbolic
>> 948 tracepoints, in the subsystem:tracepoint_name format.)
>> 949
>> 950 config PERF_COUNTERS
>> 951 bool "Kernel performance counters (old config option)"
>> 952 depends on HAVE_PERF_EVENTS
>> 953 help
>> 954 This config has been obsoleted by the PERF_EVENTS
>> 955 config option - please see that one for details.
>> 956
>> 957 It has no effect on the kernel whether you enable
>> 958 it or not, it is a compatibility placeholder.
>> 959
>> 960 Say N if unsure.
>> 961
1906 config DEBUG_PERF_USE_VMALLOC 962 config DEBUG_PERF_USE_VMALLOC
1907 default n 963 default n
1908 bool "Debug: use vmalloc to back perf 964 bool "Debug: use vmalloc to back perf mmap() buffers"
1909 depends on PERF_EVENTS && DEBUG_KERNE !! 965 depends on PERF_EVENTS && DEBUG_KERNEL
1910 select PERF_USE_VMALLOC 966 select PERF_USE_VMALLOC
1911 help 967 help
1912 Use vmalloc memory to back perf mma !! 968 Use vmalloc memory to back perf mmap() buffers.
1913 969
1914 Mostly useful for debugging the vma !! 970 Mostly useful for debugging the vmalloc code on platforms
1915 that don't require it. !! 971 that don't require it.
1916 972
1917 Say N if unsure. !! 973 Say N if unsure.
1918 974
1919 endmenu 975 endmenu
1920 976
1921 config SYSTEM_DATA_VERIFICATION !! 977 config VM_EVENT_COUNTERS
1922 def_bool n !! 978 default y
1923 select SYSTEM_TRUSTED_KEYRING !! 979 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
1924 select KEYS <<
1925 select CRYPTO <<
1926 select CRYPTO_RSA <<
1927 select ASYMMETRIC_KEY_TYPE <<
1928 select ASYMMETRIC_PUBLIC_KEY_SUBTYPE <<
1929 select ASN1 <<
1930 select OID_REGISTRY <<
1931 select X509_CERTIFICATE_PARSER <<
1932 select PKCS7_MESSAGE_PARSER <<
1933 help <<
1934 Provide PKCS#7 message verification <<
1935 trusted keyring to provide public k <<
1936 module verification, kexec image ve <<
1937 verification. <<
1938 <<
1939 config PROFILING <<
1940 bool "Profiling support" <<
1941 help 980 help
1942 Say Y here to enable the extended p !! 981 VM event counters are needed for event counts to be shown.
1943 by profilers. !! 982 This option allows the disabling of the VM event counters
>> 983 on EMBEDDED systems. /proc/vmstat will only show page counts
>> 984 if VM event counters are disabled.
1944 985
1945 config RUST !! 986 config PCI_QUIRKS
1946 bool "Rust support" !! 987 default y
1947 depends on HAVE_RUST !! 988 bool "Enable PCI quirk workarounds" if EMBEDDED
1948 depends on RUST_IS_AVAILABLE !! 989 depends on PCI
1949 depends on !MODVERSIONS !! 990 help
1950 depends on !GCC_PLUGIN_RANDSTRUCT !! 991 This enables workarounds for various PCI chipset
1951 depends on !RANDSTRUCT !! 992 bugs/quirks. Disable this only if your target machine is
1952 depends on !DEBUG_INFO_BTF || PAHOLE_ !! 993 unaffected by PCI quirks.
1953 depends on !CFI_CLANG || HAVE_CFI_ICA <<
1954 select CFI_ICALL_NORMALIZE_INTEGERS i <<
1955 depends on !CALL_PADDING || RUSTC_VER <<
1956 depends on !KASAN_SW_TAGS <<
1957 depends on !(MITIGATION_RETHUNK && KA <<
1958 help <<
1959 Enables Rust support in the kernel. <<
1960 994
1961 This allows other Rust-related opti !! 995 config SLUB_DEBUG
1962 to be selected. !! 996 default y
>> 997 bool "Enable SLUB debugging support" if EMBEDDED
>> 998 depends on SLUB && SYSFS
>> 999 help
>> 1000 SLUB has extensive debug support features. Disabling these can
>> 1001 result in significant savings in code size. This also disables
>> 1002 SLUB sysfs support. /sys/slab will not exist and there will be
>> 1003 no support for cache validation etc.
1963 1004
1964 It is also required to be able to l !! 1005 config COMPAT_BRK
1965 written in Rust. !! 1006 bool "Disable heap randomization"
>> 1007 default y
>> 1008 help
>> 1009 Randomizing heap placement makes heap exploits harder, but it
>> 1010 also breaks ancient binaries (including anything libc5 based).
>> 1011 This option changes the bootup default to heap randomization
>> 1012 disabled, and can be overridden at runtime by setting
>> 1013 /proc/sys/kernel/randomize_va_space to 2.
1966 1014
1967 See Documentation/rust/ for more in !! 1015 On non-ancient distros (post-2000 ones) N is usually a safe choice.
1968 1016
1969 If unsure, say N. !! 1017 choice
>> 1018 prompt "Choose SLAB allocator"
>> 1019 default SLUB
>> 1020 help
>> 1021 This option allows to select a slab allocator.
1970 1022
1971 config RUSTC_VERSION_TEXT !! 1023 config SLAB
1972 string !! 1024 bool "SLAB"
1973 depends on RUST <<
1974 default "$(RUSTC_VERSION_TEXT)" <<
1975 help 1025 help
1976 See `CC_VERSION_TEXT`. !! 1026 The regular slab allocator that is established and known to work
>> 1027 well in all environments. It organizes cache hot objects in
>> 1028 per cpu and per node queues.
>> 1029
>> 1030 config SLUB
>> 1031 depends on BROKEN || NUMA || !DISCONTIGMEM
>> 1032 bool "SLUB (Unqueued Allocator)"
>> 1033 help
>> 1034 SLUB is a slab allocator that minimizes cache line usage
>> 1035 instead of managing queues of cached objects (SLAB approach).
>> 1036 Per cpu caching is realized using slabs of objects instead
>> 1037 of queues of objects. SLUB can use memory efficiently
>> 1038 and has enhanced diagnostics. SLUB is the default choice for
>> 1039 a slab allocator.
>> 1040
>> 1041 config SLOB
>> 1042 depends on EMBEDDED
>> 1043 bool "SLOB (Simple Allocator)"
>> 1044 help
>> 1045 SLOB replaces the stock allocator with a drastically simpler
>> 1046 allocator. SLOB is generally more space efficient but
>> 1047 does not perform as well on large systems.
1977 1048
1978 config BINDGEN_VERSION_TEXT !! 1049 endchoice
1979 string !! 1050
1980 depends on RUST !! 1051 config PROFILING
1981 # The dummy parameter `workaround-for !! 1052 bool "Profiling support (EXPERIMENTAL)"
1982 # (https://github.com/rust-lang/rust- !! 1053 help
1983 # the minimum version is upgraded pas !! 1054 Say Y here to enable the extended profiling support mechanisms used
1984 default "$(shell,$(BINDGEN) --version !! 1055 by profilers such as OProfile.
1985 1056
1986 # 1057 #
1987 # Place an empty function call at each tracep 1058 # Place an empty function call at each tracepoint site. Can be
1988 # dynamically changed for a probe function. 1059 # dynamically changed for a probe function.
1989 # 1060 #
1990 config TRACEPOINTS 1061 config TRACEPOINTS
1991 bool 1062 bool
1992 1063
1993 source "kernel/Kconfig.kexec" !! 1064 source "arch/Kconfig"
>> 1065
>> 1066 config SLOW_WORK
>> 1067 default n
>> 1068 bool
>> 1069 help
>> 1070 The slow work thread pool provides a number of dynamically allocated
>> 1071 threads that can be used by the kernel to perform operations that
>> 1072 take a relatively long time.
>> 1073
>> 1074 An example of this would be CacheFiles doing a path lookup followed
>> 1075 by a series of mkdirs and a create call, all of which have to touch
>> 1076 disk.
>> 1077
>> 1078 See Documentation/slow-work.txt.
>> 1079
>> 1080 config SLOW_WORK_DEBUG
>> 1081 bool "Slow work debugging through debugfs"
>> 1082 default n
>> 1083 depends on SLOW_WORK && DEBUG_FS
>> 1084 help
>> 1085 Display the contents of the slow work run queue through debugfs,
>> 1086 including items currently executing.
>> 1087
>> 1088 See Documentation/slow-work.txt.
1994 1089
1995 endmenu # General setup 1090 endmenu # General setup
1996 1091
1997 source "arch/Kconfig" !! 1092 config HAVE_GENERIC_DMA_COHERENT
>> 1093 bool
>> 1094 default n
1998 1095
1999 config RT_MUTEXES !! 1096 config SLABINFO
2000 bool 1097 bool
2001 default y if PREEMPT_RT !! 1098 depends on PROC_FS
>> 1099 depends on SLAB || SLUB_DEBUG
>> 1100 default y
2002 1101
2003 config MODULE_SIG_FORMAT !! 1102 config RT_MUTEXES
2004 def_bool n !! 1103 boolean
2005 select SYSTEM_DATA_VERIFICATION <<
2006 1104
2007 source "kernel/module/Kconfig" !! 1105 config BASE_SMALL
>> 1106 int
>> 1107 default 0 if BASE_FULL
>> 1108 default 1 if !BASE_FULL
2008 1109
2009 config INIT_ALL_POSSIBLE !! 1110 menuconfig MODULES
2010 bool !! 1111 bool "Enable loadable module support"
2011 help 1112 help
2012 Back when each arch used to define !! 1113 Kernel modules are small pieces of compiled code which can
2013 cpu_possible_mask, some of them cho !! 1114 be inserted in the running kernel, rather than being
2014 with all 1s, and others with all 0s !! 1115 permanently built into the kernel. You use the "modprobe"
2015 it was better to provide this optio !! 1116 tool to add (and sometimes remove) them. If you say Y here,
2016 and have several arch maintainers p !! 1117 many parts of the kernel can be built as modules (by
>> 1118 answering M instead of Y where indicated): this is most
>> 1119 useful for infrequently used options which are not required
>> 1120 for booting. For more information, see the man pages for
>> 1121 modprobe, lsmod, modinfo, insmod and rmmod.
>> 1122
>> 1123 If you say Y here, you will need to run "make
>> 1124 modules_install" to put the modules under /lib/modules/
>> 1125 where modprobe can find them (you may need to be root to do
>> 1126 this).
2017 1127
2018 source "block/Kconfig" !! 1128 If unsure, say Y.
2019 1129
2020 config PREEMPT_NOTIFIERS !! 1130 if MODULES
2021 bool <<
2022 1131
2023 config PADATA !! 1132 config MODULE_FORCE_LOAD
2024 depends on SMP !! 1133 bool "Forced module loading"
2025 bool !! 1134 default n
>> 1135 help
>> 1136 Allow loading of modules without version information (ie. modprobe
>> 1137 --force). Forced module loading sets the 'F' (forced) taint flag and
>> 1138 is usually a really bad idea.
>> 1139
>> 1140 config MODULE_UNLOAD
>> 1141 bool "Module unloading"
>> 1142 help
>> 1143 Without this option you will not be able to unload any
>> 1144 modules (note that some modules may not be unloadable
>> 1145 anyway), which makes your kernel smaller, faster
>> 1146 and simpler. If unsure, say Y.
>> 1147
>> 1148 config MODULE_FORCE_UNLOAD
>> 1149 bool "Forced module unloading"
>> 1150 depends on MODULE_UNLOAD && EXPERIMENTAL
>> 1151 help
>> 1152 This option allows you to force a module to unload, even if the
>> 1153 kernel believes it is unsafe: the kernel will remove the module
>> 1154 without waiting for anyone to stop using it (using the -f option to
>> 1155 rmmod). This is mainly for kernel developers and desperate users.
>> 1156 If unsure, say N.
2026 1157
2027 config ASN1 !! 1158 config MODVERSIONS
2028 tristate !! 1159 bool "Module versioning support"
2029 help 1160 help
2030 Build a simple ASN.1 grammar compil !! 1161 Usually, you have to use modules compiled with your kernel.
2031 that can be interpreted by the ASN. !! 1162 Saying Y here makes it sometimes possible to use modules
2032 inform it as to what tags are to be !! 1163 compiled for different kernels, by adding enough information
2033 functions to call on what tags. !! 1164 to the modules to (hopefully) spot any changes which would
>> 1165 make them incompatible with the kernel you are running. If
>> 1166 unsure, say N.
>> 1167
>> 1168 config MODULE_SRCVERSION_ALL
>> 1169 bool "Source checksum for all modules"
>> 1170 help
>> 1171 Modules which contain a MODULE_VERSION get an extra "srcversion"
>> 1172 field inserted into their modinfo section, which contains a
>> 1173 sum of the source files which made it. This helps maintainers
>> 1174 see exactly which source was used to build a module (since
>> 1175 others sometimes change the module source without updating
>> 1176 the version). With this option, such a "srcversion" field
>> 1177 will be created for all modules. If unsure, say N.
2034 1178
2035 source "kernel/Kconfig.locks" !! 1179 endif # MODULES
2036 1180
2037 config ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE !! 1181 config INIT_ALL_POSSIBLE
2038 bool 1182 bool
>> 1183 help
>> 1184 Back when each arch used to define their own cpu_online_map and
>> 1185 cpu_possible_map, some of them chose to initialize cpu_possible_map
>> 1186 with all 1s, and others with all 0s. When they were centralised,
>> 1187 it was better to provide this option than to break all the archs
>> 1188 and have several arch maintainers pursuing me down dark alleys.
2039 1189
2040 config ARCH_HAS_PREPARE_SYNC_CORE_CMD !! 1190 config STOP_MACHINE
2041 bool 1191 bool
>> 1192 default y
>> 1193 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
>> 1194 help
>> 1195 Need stop_machine() primitive.
2042 1196
2043 config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE !! 1197 source "block/Kconfig"
>> 1198
>> 1199 config PREEMPT_NOTIFIERS
2044 bool 1200 bool
2045 1201
2046 # It may be useful for an architecture to ove <<
2047 # SYSCALL_DEFINE() and __SYSCALL_DEFINEx() ma <<
2048 # and the COMPAT_ variants in <linux/compat.h <<
2049 # different calling convention for syscalls. <<
2050 # macros for not-implemented syscalls in kern <<
2051 # kernel/time/posix-stubs.c. All these overri <<
2052 # <asm/syscall_wrapper.h>. <<
2053 config ARCH_HAS_SYSCALL_WRAPPER <<
2054 def_bool n <<
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