Roman Zippel | 80daa56 | 2008-01-14 04:51:16 +0100 | [diff] [blame] | 1 | config ARCH |
| 2 | string |
| 3 | option env="ARCH" |
| 4 | |
| 5 | config KERNELVERSION |
| 6 | string |
| 7 | option env="KERNELVERSION" |
| 8 | |
Roman Zippel | face437 | 2006-06-08 22:12:45 -0700 | [diff] [blame] | 9 | config DEFCONFIG_LIST |
| 10 | string |
Paolo 'Blaisorblade' Giarrusso | b2670eac | 2006-10-19 23:28:23 -0700 | [diff] [blame] | 11 | depends on !UML |
Roman Zippel | face437 | 2006-06-08 22:12:45 -0700 | [diff] [blame] | 12 | option defconfig_list |
| 13 | default "/lib/modules/$UNAME_RELEASE/.config" |
| 14 | default "/etc/kernel-config" |
| 15 | default "/boot/config-$UNAME_RELEASE" |
Sam Ravnborg | 7353190 | 2008-05-25 23:03:18 +0200 | [diff] [blame] | 16 | default "$ARCH_DEFCONFIG" |
Roman Zippel | face437 | 2006-06-08 22:12:45 -0700 | [diff] [blame] | 17 | default "arch/$ARCH/defconfig" |
| 18 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 19 | config CONSTRUCTORS |
| 20 | bool |
| 21 | depends on !UML |
| 22 | default y |
| 23 | |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 24 | config HAVE_IRQ_WORK |
| 25 | bool |
| 26 | |
| 27 | config IRQ_WORK |
| 28 | bool |
| 29 | depends on HAVE_IRQ_WORK |
| 30 | |
Al Boldi | ff0cfc6 | 2007-07-31 00:39:23 -0700 | [diff] [blame] | 31 | menu "General setup" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | config EXPERIMENTAL |
| 34 | bool "Prompt for development and/or incomplete code/drivers" |
| 35 | ---help--- |
| 36 | Some of the various things that Linux supports (such as network |
| 37 | drivers, file systems, network protocols, etc.) can be in a state |
| 38 | of development where the functionality, stability, or the level of |
| 39 | testing is not yet high enough for general use. This is usually |
| 40 | known as the "alpha-test" phase among developers. If a feature is |
| 41 | currently in alpha-test, then the developers usually discourage |
| 42 | uninformed widespread use of this feature by the general public to |
| 43 | avoid "Why doesn't this work?" type mail messages. However, active |
| 44 | testing and use of these systems is welcomed. Just be aware that it |
| 45 | may not meet the normal level of reliability or it may fail to work |
| 46 | in some special cases. Detailed bug reports from people familiar |
| 47 | with the kernel internals are usually welcomed by the developers |
| 48 | (before submitting bug reports, please read the documents |
| 49 | <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, |
| 50 | <file:Documentation/BUG-HUNTING>, and |
| 51 | <file:Documentation/oops-tracing.txt> in the kernel source). |
| 52 | |
| 53 | This option will also make obsoleted drivers available. These are |
| 54 | drivers that have been replaced by something else, and/or are |
| 55 | scheduled to be removed in a future kernel release. |
| 56 | |
| 57 | Unless you intend to help test and develop a feature or driver that |
| 58 | falls into this category, or you have a situation that requires |
| 59 | using these features, you should probably say N here, which will |
| 60 | cause the configurator to present you with fewer choices. If |
| 61 | you say Y here, you will be offered the choice of using features or |
| 62 | drivers that are currently considered to be in the alpha-test phase. |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | config BROKEN |
| 65 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | config BROKEN_ON_SMP |
| 68 | bool |
| 69 | depends on BROKEN || !SMP |
| 70 | default y |
| 71 | |
| 72 | config LOCK_KERNEL |
| 73 | bool |
Arnd Bergmann | 6de5bd1 | 2010-09-11 18:00:57 +0200 | [diff] [blame] | 74 | depends on (SMP || PREEMPT) && BKL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | default y |
| 76 | |
| 77 | config INIT_ENV_ARG_LIMIT |
| 78 | int |
Adrian Bunk | dd673bc | 2006-06-30 01:55:51 -0700 | [diff] [blame] | 79 | default 32 if !UML |
| 80 | default 128 if UML |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | help |
Randy Dunlap | 34ad92c | 2005-10-30 15:01:46 -0800 | [diff] [blame] | 82 | Maximum of each of the number of arguments and environment |
| 83 | variables passed to init from the kernel command line. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Roland McGrath | 8433646 | 2009-12-21 16:24:06 -0800 | [diff] [blame] | 86 | config CROSS_COMPILE |
| 87 | string "Cross-compiler tool prefix" |
| 88 | help |
| 89 | Same as running 'make CROSS_COMPILE=prefix-' but stored for |
| 90 | default make runs in this kernel build directory. You don't |
| 91 | need to set this unless you want the configured kernel build |
| 92 | directory to select the cross-compiler automatically. |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | config LOCALVERSION |
| 95 | string "Local version - append to kernel release" |
| 96 | help |
| 97 | Append an extra string to the end of your kernel version. |
| 98 | This will show up when you type uname, for example. |
| 99 | The string you set here will be appended after the contents of |
| 100 | any files with a filename matching localversion* in your |
| 101 | object and source tree, in that order. Your total string can |
| 102 | be a maximum of 64 characters. |
| 103 | |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 104 | config LOCALVERSION_AUTO |
| 105 | bool "Automatically append version information to the version string" |
| 106 | default y |
| 107 | help |
| 108 | This will try to automatically determine if the current tree is a |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 109 | release tree by looking for git tags that belong to the current |
| 110 | top of tree revision. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 111 | |
| 112 | A string of the format -gxxxxxxxx will be added to the localversion |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 113 | if a git-based tree is found. The string generated by this will be |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 114 | appended after any matching localversion* files, and after the value |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 115 | set in CONFIG_LOCALVERSION. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 116 | |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 117 | (The actual string used here is the first eight characters produced |
| 118 | by running the command: |
| 119 | |
| 120 | $ git rev-parse --verify HEAD |
| 121 | |
| 122 | which is done within the script "scripts/setlocalversion".) |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 123 | |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 124 | config HAVE_KERNEL_GZIP |
| 125 | bool |
| 126 | |
| 127 | config HAVE_KERNEL_BZIP2 |
| 128 | bool |
| 129 | |
| 130 | config HAVE_KERNEL_LZMA |
| 131 | bool |
| 132 | |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 133 | config HAVE_KERNEL_LZO |
| 134 | bool |
| 135 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 136 | choice |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 137 | prompt "Kernel compression mode" |
| 138 | default KERNEL_GZIP |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 139 | depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_LZO |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 140 | help |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 141 | The linux kernel is a kind of self-extracting executable. |
| 142 | Several compression algorithms are available, which differ |
| 143 | in efficiency, compression and decompression speed. |
| 144 | Compression speed is only relevant when building a kernel. |
| 145 | Decompression speed is relevant at each boot. |
| 146 | |
| 147 | If you have any problems with bzip2 or lzma compressed |
| 148 | kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older |
| 149 | version of this functionality (bzip2 only), for 2.4, was |
| 150 | supplied by Christian Ludwig) |
| 151 | |
| 152 | High compression options are mostly useful for users, who |
| 153 | are low on disk space (embedded systems), but for whom ram |
| 154 | size matters less. |
| 155 | |
| 156 | If in doubt, select 'gzip' |
| 157 | |
| 158 | config KERNEL_GZIP |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 159 | bool "Gzip" |
| 160 | depends on HAVE_KERNEL_GZIP |
| 161 | help |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 162 | The old and tried gzip compression. It provides a good balance |
| 163 | between compression ratio and decompression speed. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 164 | |
| 165 | config KERNEL_BZIP2 |
| 166 | bool "Bzip2" |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 167 | depends on HAVE_KERNEL_BZIP2 |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 168 | help |
| 169 | Its compression ratio and speed is intermediate. |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 170 | Decompression speed is slowest among the three. The kernel |
| 171 | size is about 10% smaller with bzip2, in comparison to gzip. |
| 172 | Bzip2 uses a large amount of memory. For modern kernels you |
| 173 | will need at least 8MB RAM or more for booting. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 174 | |
| 175 | config KERNEL_LZMA |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 176 | bool "LZMA" |
| 177 | depends on HAVE_KERNEL_LZMA |
| 178 | help |
| 179 | The most recent compression algorithm. |
| 180 | Its ratio is best, decompression speed is between the other |
| 181 | two. Compression is slowest. The kernel size is about 33% |
| 182 | smaller with LZMA in comparison to gzip. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 183 | |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 184 | config KERNEL_LZO |
| 185 | bool "LZO" |
| 186 | depends on HAVE_KERNEL_LZO |
| 187 | help |
| 188 | Its compression ratio is the poorest among the 4. The kernel |
Stephan Sperber | 681b304 | 2010-07-14 11:23:08 +0200 | [diff] [blame] | 189 | size is about 10% bigger than gzip; however its speed |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 190 | (both compression and decompression) is the fastest. |
| 191 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 192 | endchoice |
| 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | config SWAP |
| 195 | bool "Support for paging of anonymous memory (swap)" |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 196 | depends on MMU && BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | default y |
| 198 | help |
| 199 | This option allows you to choose whether you want to have support |
Jesper Juhl | 92c3504 | 2006-01-15 02:40:08 +0100 | [diff] [blame] | 200 | for so called swap devices or swap files in your kernel that are |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | used to provide more virtual memory than the actual RAM present |
| 202 | in your computer. If unsure say Y. |
| 203 | |
| 204 | config SYSVIPC |
| 205 | bool "System V IPC" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | ---help--- |
| 207 | Inter Process Communication is a suite of library functions and |
| 208 | system calls which let processes (running programs) synchronize and |
| 209 | exchange information. It is generally considered to be a good thing, |
| 210 | and some programs won't run unless you say Y here. In particular, if |
| 211 | you want to run the DOS emulator dosemu under Linux (read the |
| 212 | DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), |
| 213 | you'll need to say Y here. |
| 214 | |
| 215 | You can find documentation about IPC with "info ipc" and also in |
| 216 | section 6.4 of the Linux Programmer's Guide, available from |
| 217 | <http://www.tldp.org/guides.html>. |
| 218 | |
Eric W. Biederman | a5494dc | 2007-02-14 00:34:06 -0800 | [diff] [blame] | 219 | config SYSVIPC_SYSCTL |
| 220 | bool |
| 221 | depends on SYSVIPC |
| 222 | depends on SYSCTL |
| 223 | default y |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | config POSIX_MQUEUE |
| 226 | bool "POSIX Message Queues" |
| 227 | depends on NET && EXPERIMENTAL |
| 228 | ---help--- |
| 229 | POSIX variant of message queues is a part of IPC. In POSIX message |
| 230 | queues every message has a priority which decides about succession |
| 231 | of receiving it by a process. If you want to compile and run |
| 232 | programs written e.g. for Solaris with use of its POSIX message |
Robert P. J. Day | b0e3765 | 2007-05-09 07:25:13 +0200 | [diff] [blame] | 233 | queues (functions mq_*) say Y here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
| 235 | POSIX message queues are visible as a filesystem called 'mqueue' |
| 236 | and can be mounted somewhere if you want to do filesystem |
| 237 | operations on message queues. |
| 238 | |
| 239 | If unsure, say Y. |
| 240 | |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 241 | config POSIX_MQUEUE_SYSCTL |
| 242 | bool |
| 243 | depends on POSIX_MQUEUE |
| 244 | depends on SYSCTL |
| 245 | default y |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | config BSD_PROCESS_ACCT |
| 248 | bool "BSD Process Accounting" |
| 249 | help |
| 250 | If you say Y here, a user level program will be able to instruct the |
| 251 | kernel (via a special system call) to write process accounting |
| 252 | information to a file: whenever a process exits, information about |
| 253 | that process will be appended to the file by the kernel. The |
| 254 | information includes things such as creation time, owning user, |
| 255 | command name, memory usage, controlling terminal etc. (the complete |
| 256 | list is in the struct acct in <file:include/linux/acct.h>). It is |
| 257 | up to the user level program to do useful things with this |
| 258 | information. This is generally a good idea, so say Y. |
| 259 | |
| 260 | config BSD_PROCESS_ACCT_V3 |
| 261 | bool "BSD Process Accounting version 3 file format" |
| 262 | depends on BSD_PROCESS_ACCT |
| 263 | default n |
| 264 | help |
| 265 | If you say Y here, the process accounting information is written |
| 266 | in a new file format that also logs the process IDs of each |
| 267 | process and it's parent. Note that this file format is incompatible |
| 268 | with previous v0/v1/v2 file formats, so you will need updated tools |
| 269 | for processing it. A preliminary version of these tools is available |
S.Çağlar Onur | 37a4c94 | 2008-06-18 11:45:13 +0300 | [diff] [blame] | 270 | at <http://www.gnu.org/software/acct/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 272 | config TASKSTATS |
| 273 | bool "Export task/process statistics through netlink (EXPERIMENTAL)" |
| 274 | depends on NET |
| 275 | default n |
| 276 | help |
| 277 | Export selected statistics for tasks/processes through the |
| 278 | generic netlink interface. Unlike BSD process accounting, the |
| 279 | statistics are available during the lifetime of tasks/processes as |
| 280 | responses to commands. Like BSD accounting, they are sent to user |
| 281 | space on task exit. |
| 282 | |
| 283 | Say N if unsure. |
| 284 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 285 | config TASK_DELAY_ACCT |
| 286 | bool "Enable per-task delay accounting (EXPERIMENTAL)" |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 287 | depends on TASKSTATS |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 288 | help |
| 289 | Collect information on time spent by a task waiting for system |
| 290 | resources like cpu, synchronous block I/O completion and swapping |
| 291 | in pages. Such statistics can help in setting a task's priorities |
| 292 | relative to other tasks for cpu, io, rss limits etc. |
| 293 | |
| 294 | Say N if unsure. |
| 295 | |
Alexey Dobriyan | 18f705f | 2007-02-10 01:46:44 -0800 | [diff] [blame] | 296 | config TASK_XACCT |
| 297 | bool "Enable extended accounting over taskstats (EXPERIMENTAL)" |
| 298 | depends on TASKSTATS |
| 299 | help |
| 300 | Collect extended task accounting data and send the data |
| 301 | to userland for processing over the taskstats interface. |
| 302 | |
| 303 | Say N if unsure. |
| 304 | |
| 305 | config TASK_IO_ACCOUNTING |
| 306 | bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" |
| 307 | depends on TASK_XACCT |
| 308 | help |
| 309 | Collect information on the number of bytes of storage I/O which this |
| 310 | task has caused. |
| 311 | |
| 312 | Say N if unsure. |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | config AUDIT |
| 315 | bool "Auditing support" |
Chris Wright | 804a6a49 | 2005-05-11 10:52:45 +0100 | [diff] [blame] | 316 | depends on NET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | help |
| 318 | Enable auditing infrastructure that can be used with another |
| 319 | kernel subsystem, such as SELinux (which requires this for |
| 320 | logging of avc messages output). Does not do system-call |
| 321 | auditing without CONFIG_AUDITSYSCALL. |
| 322 | |
| 323 | config AUDITSYSCALL |
| 324 | bool "Enable system-call auditing support" |
Kumar Gala | 022382a | 2009-10-16 07:21:37 +0000 | [diff] [blame] | 325 | depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | default y if SECURITY_SELINUX |
| 327 | help |
| 328 | Enable low-overhead system-call auditing infrastructure that |
| 329 | can be used independently or with another kernel subsystem, |
Eric Paris | 67640b6 | 2009-12-17 20:12:06 -0500 | [diff] [blame] | 330 | such as SELinux. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Eric Paris | 939a67f | 2009-12-17 20:12:06 -0500 | [diff] [blame] | 332 | config AUDIT_WATCH |
| 333 | def_bool y |
| 334 | depends on AUDITSYSCALL |
| 335 | select FSNOTIFY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 337 | config AUDIT_TREE |
| 338 | def_bool y |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 339 | depends on AUDITSYSCALL |
Eric Paris | 28a3a7e | 2009-12-17 20:12:05 -0500 | [diff] [blame] | 340 | select FSNOTIFY |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 341 | |
Thomas Gleixner | d9817eb | 2010-09-27 12:45:59 +0000 | [diff] [blame] | 342 | source "kernel/irq/Kconfig" |
| 343 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 344 | menu "RCU Subsystem" |
| 345 | |
| 346 | choice |
| 347 | prompt "RCU Implementation" |
Paul E. McKenney | 31c9a24 | 2009-04-02 21:06:25 -0700 | [diff] [blame] | 348 | default TREE_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 349 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 350 | config TREE_RCU |
| 351 | bool "Tree-based hierarchical RCU" |
Paul E. McKenney | 687d7a9 | 2010-07-21 06:52:40 -0700 | [diff] [blame] | 352 | depends on !PREEMPT && SMP |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 353 | help |
| 354 | This option selects the RCU implementation that is |
| 355 | designed for very large SMP system with hundreds or |
Paul E. McKenney | c17ef45 | 2009-06-23 17:12:47 -0700 | [diff] [blame] | 356 | thousands of CPUs. It also scales down nicely to |
| 357 | smaller systems. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 358 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 359 | config TREE_PREEMPT_RCU |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 360 | bool "Preemptible tree-based hierarchical RCU" |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 361 | depends on PREEMPT |
| 362 | help |
| 363 | This option selects the RCU implementation that is |
| 364 | designed for very large SMP systems with hundreds or |
| 365 | thousands of CPUs, but for which real-time response |
Paul E. McKenney | bbe3eae | 2009-09-13 09:15:08 -0700 | [diff] [blame] | 366 | is also required. It also scales down nicely to |
| 367 | smaller systems. |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 368 | |
Paul E. McKenney | 9b1d82f | 2009-10-25 19:03:50 -0700 | [diff] [blame] | 369 | config TINY_RCU |
| 370 | bool "UP-only small-memory-footprint RCU" |
| 371 | depends on !SMP |
| 372 | help |
| 373 | This option selects the RCU implementation that is |
| 374 | designed for UP systems from which real-time response |
| 375 | is not required. This option greatly reduces the |
| 376 | memory footprint of RCU. |
| 377 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 378 | config TINY_PREEMPT_RCU |
| 379 | bool "Preemptible UP-only small-memory-footprint RCU" |
| 380 | depends on !SMP && PREEMPT |
| 381 | help |
| 382 | This option selects the RCU implementation that is designed |
| 383 | for real-time UP systems. This option greatly reduces the |
| 384 | memory footprint of RCU. |
| 385 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 386 | endchoice |
| 387 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 388 | config PREEMPT_RCU |
| 389 | def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU ) |
| 390 | help |
| 391 | This option enables preemptible-RCU code that is common between |
| 392 | the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations. |
| 393 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 394 | config RCU_TRACE |
| 395 | bool "Enable tracing for RCU" |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 396 | help |
| 397 | This option provides tracing in RCU which presents stats |
| 398 | in debugfs for debugging RCU implementation. |
| 399 | |
| 400 | Say Y here if you want to enable RCU tracing |
| 401 | Say N if you are unsure. |
| 402 | |
| 403 | config RCU_FANOUT |
| 404 | int "Tree-based hierarchical RCU fanout value" |
| 405 | range 2 64 if 64BIT |
| 406 | range 2 32 if !64BIT |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 407 | depends on TREE_RCU || TREE_PREEMPT_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 408 | default 64 if 64BIT |
| 409 | default 32 if !64BIT |
| 410 | help |
| 411 | This option controls the fanout of hierarchical implementations |
| 412 | of RCU, allowing RCU to work efficiently on machines with |
Paul E. McKenney | 4d87ffa | 2010-08-04 17:31:12 -0700 | [diff] [blame] | 413 | large numbers of CPUs. This value must be at least the fourth |
| 414 | root of NR_CPUS, which allows NR_CPUS to be insanely large. |
| 415 | The default value of RCU_FANOUT should be used for production |
| 416 | systems, but if you are stress-testing the RCU implementation |
| 417 | itself, small RCU_FANOUT values allow you to test large-system |
| 418 | code paths on small(er) systems. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 419 | |
| 420 | Select a specific number if testing RCU itself. |
| 421 | Take the default if unsure. |
| 422 | |
| 423 | config RCU_FANOUT_EXACT |
| 424 | bool "Disable tree-based hierarchical RCU auto-balancing" |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 425 | depends on TREE_RCU || TREE_PREEMPT_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 426 | default n |
| 427 | help |
| 428 | This option forces use of the exact RCU_FANOUT value specified, |
| 429 | regardless of imbalances in the hierarchy. This is useful for |
| 430 | testing RCU itself, and might one day be useful on systems with |
| 431 | strong NUMA behavior. |
| 432 | |
| 433 | Without RCU_FANOUT_EXACT, the code will balance the hierarchy. |
| 434 | |
| 435 | Say N if unsure. |
| 436 | |
Paul E. McKenney | 8bd93a2 | 2010-02-22 17:04:59 -0800 | [diff] [blame] | 437 | config RCU_FAST_NO_HZ |
| 438 | bool "Accelerate last non-dyntick-idle CPU's grace periods" |
| 439 | depends on TREE_RCU && NO_HZ && SMP |
| 440 | default n |
| 441 | help |
| 442 | This option causes RCU to attempt to accelerate grace periods |
| 443 | in order to allow the final CPU to enter dynticks-idle state |
| 444 | more quickly. On the other hand, this option increases the |
| 445 | overhead of the dynticks-idle checking, particularly on systems |
| 446 | with large numbers of CPUs. |
| 447 | |
| 448 | Say Y if energy efficiency is critically important, particularly |
| 449 | if you have relatively few CPUs. |
| 450 | |
| 451 | Say N if you are unsure. |
| 452 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 453 | config TREE_RCU_TRACE |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 454 | def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 455 | select DEBUG_FS |
| 456 | help |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 457 | This option provides tracing for the TREE_RCU and |
| 458 | TREE_PREEMPT_RCU implementations, permitting Makefile to |
| 459 | trivially select kernel/rcutree_trace.c. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 460 | |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 461 | config RCU_BOOST |
| 462 | bool "Enable RCU priority boosting" |
| 463 | depends on RT_MUTEXES && TINY_PREEMPT_RCU |
| 464 | default n |
| 465 | help |
| 466 | This option boosts the priority of preempted RCU readers that |
| 467 | block the current preemptible RCU grace period for too long. |
| 468 | This option also prevents heavy loads from blocking RCU |
| 469 | callback invocation for all flavors of RCU. |
| 470 | |
| 471 | Say Y here if you are working with real-time apps or heavy loads |
| 472 | Say N here if you are unsure. |
| 473 | |
| 474 | config RCU_BOOST_PRIO |
| 475 | int "Real-time priority to boost RCU readers to" |
| 476 | range 1 99 |
| 477 | depends on RCU_BOOST |
| 478 | default 1 |
| 479 | help |
| 480 | This option specifies the real-time priority to which preempted |
| 481 | RCU readers are to be boosted. If you are working with CPU-bound |
| 482 | real-time applications, you should specify a priority higher then |
| 483 | the highest-priority CPU-bound application. |
| 484 | |
| 485 | Specify the real-time priority, or take the default if unsure. |
| 486 | |
| 487 | config RCU_BOOST_DELAY |
| 488 | int "Milliseconds to delay boosting after RCU grace-period start" |
| 489 | range 0 3000 |
| 490 | depends on RCU_BOOST |
| 491 | default 500 |
| 492 | help |
| 493 | This option specifies the time to wait after the beginning of |
| 494 | a given grace period before priority-boosting preempted RCU |
| 495 | readers blocking that grace period. Note that any RCU reader |
| 496 | blocking an expedited RCU grace period is boosted immediately. |
| 497 | |
| 498 | Accept the default if unsure. |
| 499 | |
Paul E. McKenney | 46fdb09 | 2010-10-26 02:11:40 -0700 | [diff] [blame] | 500 | config SRCU_SYNCHRONIZE_DELAY |
| 501 | int "Microseconds to delay before waiting for readers" |
| 502 | range 0 20 |
| 503 | default 10 |
| 504 | help |
| 505 | This option controls how long SRCU delays before entering its |
| 506 | loop waiting on SRCU readers. The purpose of this loop is |
| 507 | to avoid the unconditional context-switch penalty that would |
| 508 | otherwise be incurred if there was an active SRCU reader, |
| 509 | in a manner similar to adaptive locking schemes. This should |
| 510 | be set to be a bit longer than the common-case SRCU read-side |
| 511 | critical-section overhead. |
| 512 | |
| 513 | Accept the default if unsure. |
| 514 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 515 | endmenu # "RCU Subsystem" |
| 516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | config IKCONFIG |
Ross Biro | f2443ab | 2006-09-30 23:27:25 -0700 | [diff] [blame] | 518 | tristate "Kernel .config support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | ---help--- |
| 520 | This option enables the complete Linux kernel ".config" file |
| 521 | contents to be saved in the kernel. It provides documentation |
| 522 | of which kernel options are used in a running kernel or in an |
| 523 | on-disk kernel. This information can be extracted from the kernel |
| 524 | image file with the script scripts/extract-ikconfig and used as |
| 525 | input to rebuild the current kernel or to build another kernel. |
| 526 | It can also be extracted from a running kernel by reading |
| 527 | /proc/config.gz if enabled (below). |
| 528 | |
| 529 | config IKCONFIG_PROC |
| 530 | bool "Enable access to .config through /proc/config.gz" |
| 531 | depends on IKCONFIG && PROC_FS |
| 532 | ---help--- |
| 533 | This option enables access to the kernel configuration file |
| 534 | through /proc/config.gz. |
| 535 | |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 536 | config LOG_BUF_SHIFT |
| 537 | int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" |
| 538 | range 12 21 |
Adrian Bunk | f17a32e | 2008-04-29 00:58:58 -0700 | [diff] [blame] | 539 | default 17 |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 540 | help |
| 541 | Select kernel log buffer size as a power of 2. |
Adrian Bunk | f17a32e | 2008-04-29 00:58:58 -0700 | [diff] [blame] | 542 | Examples: |
| 543 | 17 => 128 KB |
| 544 | 16 => 64 KB |
| 545 | 15 => 32 KB |
| 546 | 14 => 16 KB |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 547 | 13 => 8 KB |
| 548 | 12 => 4 KB |
| 549 | |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 550 | # |
| 551 | # Architectures with an unreliable sched_clock() should select this: |
| 552 | # |
| 553 | config HAVE_UNSTABLE_SCHED_CLOCK |
| 554 | bool |
| 555 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 556 | menuconfig CGROUPS |
| 557 | boolean "Control Group support" |
Kirill A. Shutemov | 0dea116 | 2010-03-10 15:22:20 -0800 | [diff] [blame] | 558 | depends on EVENTFD |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 559 | help |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 560 | This option adds support for grouping sets of processes together, for |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 561 | use with process control subsystems such as Cpusets, CFS, memory |
| 562 | controls or device isolation. |
| 563 | See |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 564 | - Documentation/scheduler/sched-design-CFS.txt (CFS) |
Li Zefan | 45ce80f | 2009-01-15 13:50:59 -0800 | [diff] [blame] | 565 | - Documentation/cgroups/ (features for grouping, isolation |
| 566 | and resource control) |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 567 | |
| 568 | Say N if unsure. |
| 569 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 570 | if CGROUPS |
| 571 | |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 572 | config CGROUP_DEBUG |
| 573 | bool "Example debug cgroup subsystem" |
Paul Menage | 418d7d8 | 2008-04-29 01:00:05 -0700 | [diff] [blame] | 574 | default n |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 575 | help |
| 576 | This option enables a simple cgroup subsystem that |
| 577 | exports useful debugging information about the cgroups |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 578 | framework. |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 579 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 580 | Say N if unsure. |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 581 | |
Serge E. Hallyn | 858d72e | 2007-10-18 23:39:45 -0700 | [diff] [blame] | 582 | config CGROUP_NS |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 583 | bool "Namespace cgroup subsystem" |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 584 | help |
| 585 | Provides a simple namespace cgroup subsystem to |
| 586 | provide hierarchical naming of sets of namespaces, |
| 587 | for instance virtual servers and checkpoint/restart |
| 588 | jobs. |
Serge E. Hallyn | 858d72e | 2007-10-18 23:39:45 -0700 | [diff] [blame] | 589 | |
Matt Helsley | dc52ddc | 2008-10-18 20:27:21 -0700 | [diff] [blame] | 590 | config CGROUP_FREEZER |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 591 | bool "Freezer cgroup subsystem" |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 592 | help |
| 593 | Provides a way to freeze and unfreeze all tasks in a |
Matt Helsley | dc52ddc | 2008-10-18 20:27:21 -0700 | [diff] [blame] | 594 | cgroup. |
| 595 | |
Serge E. Hallyn | 08ce5f1 | 2008-04-29 01:00:10 -0700 | [diff] [blame] | 596 | config CGROUP_DEVICE |
| 597 | bool "Device controller for cgroups" |
Serge E. Hallyn | 08ce5f1 | 2008-04-29 01:00:10 -0700 | [diff] [blame] | 598 | help |
| 599 | Provides a cgroup implementing whitelists for devices which |
| 600 | a process in the cgroup can mknod or open. |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | config CPUSETS |
| 603 | bool "Cpuset support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | help |
Randy Dunlap | d9fd8a6 | 2005-07-27 11:45:11 -0700 | [diff] [blame] | 605 | This option will let you create and manage CPUSETs which |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | allow dynamically partitioning a system into sets of CPUs and |
| 607 | Memory Nodes and assigning tasks to run only within those sets. |
| 608 | This is primarily useful on large SMP or NUMA systems. |
| 609 | |
| 610 | Say N if unsure. |
| 611 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 612 | config PROC_PID_CPUSET |
| 613 | bool "Include legacy /proc/<pid>/cpuset file" |
| 614 | depends on CPUSETS |
| 615 | default y |
| 616 | |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 617 | config CGROUP_CPUACCT |
| 618 | bool "Simple CPU accounting cgroup subsystem" |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 619 | help |
| 620 | Provides a simple Resource Controller for monitoring the |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 621 | total CPU consumed by the tasks in a cgroup. |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 622 | |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 623 | config RESOURCE_COUNTERS |
| 624 | bool "Resource counters" |
| 625 | help |
| 626 | This option enables controller independent resource accounting |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 627 | infrastructure that works with cgroups. |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 628 | |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 629 | config CGROUP_MEM_RES_CTLR |
| 630 | bool "Memory Resource Controller for Control Groups" |
Daniel Lezcano | 79ae9c2 | 2010-10-27 15:34:39 -0700 | [diff] [blame] | 631 | depends on RESOURCE_COUNTERS |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 632 | select MM_OWNER |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 633 | help |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 634 | Provides a memory resource controller that manages both anonymous |
Thadeu Lima de Souza Cascardo | 21acb9c | 2009-02-04 10:12:08 +0100 | [diff] [blame] | 635 | memory and page cache. (See Documentation/cgroups/memory.txt) |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 636 | |
| 637 | Note that setting this option increases fixed memory overhead |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 638 | associated with each page of memory in the system. By this, |
| 639 | 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory |
| 640 | usage tracking struct at boot. Total amount of this is printed out |
| 641 | at boot. |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 642 | |
| 643 | Only enable when you're ok with these trade offs and really |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 644 | sure you need the memory resource controller. Even when you enable |
| 645 | this, you can set "cgroup_disable=memory" at your boot option to |
| 646 | disable memory resource controller and you can avoid overheads. |
Li Zefan | c9d5409 | 2009-01-07 18:07:35 -0800 | [diff] [blame] | 647 | (and lose benefits of memory resource controller) |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 648 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 649 | This config option also selects MM_OWNER config option, which |
| 650 | could in turn add some fork/exit overhead. |
| 651 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 652 | config CGROUP_MEM_RES_CTLR_SWAP |
KAMEZAWA Hiroyuki | 65e0e81 | 2010-08-10 18:02:56 -0700 | [diff] [blame] | 653 | bool "Memory Resource Controller Swap Extension" |
| 654 | depends on CGROUP_MEM_RES_CTLR && SWAP |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 655 | help |
| 656 | Add swap management feature to memory resource controller. When you |
| 657 | enable this, you can limit mem+swap usage per cgroup. In other words, |
| 658 | when you disable this, memory resource controller has no cares to |
| 659 | usage of swap...a process can exhaust all of the swap. This extension |
| 660 | is useful when you want to avoid exhaustion swap but this itself |
| 661 | adds more overheads and consumes memory for remembering information. |
| 662 | Especially if you use 32bit system or small memory system, please |
| 663 | be careful about enabling this. When memory resource controller |
| 664 | is disabled by boot option, this will be automatically disabled and |
| 665 | there will be no overhead from this. Even when you set this config=y, |
| 666 | if boot option "noswapaccount" is set, swap will not be accounted. |
KAMEZAWA Hiroyuki | 627991a | 2009-04-02 16:57:47 -0700 | [diff] [blame] | 667 | Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page |
| 668 | size is 4096bytes, 512k per 1Gbytes of swap. |
Michal Hocko | a42c390 | 2010-11-24 12:57:08 -0800 | [diff] [blame] | 669 | config CGROUP_MEM_RES_CTLR_SWAP_ENABLED |
| 670 | bool "Memory Resource Controller Swap Extension enabled by default" |
| 671 | depends on CGROUP_MEM_RES_CTLR_SWAP |
| 672 | default y |
| 673 | help |
| 674 | Memory Resource Controller Swap Extension comes with its price in |
| 675 | a bigger memory consumption. General purpose distribution kernels |
| 676 | which want to enable the feautre but keep it disabled by default |
| 677 | and let the user enable it by swapaccount boot command line |
| 678 | parameter should have this option unselected. |
| 679 | For those who want to have the feature enabled by default should |
| 680 | select this option (if, for some reason, they need to disable it |
| 681 | then noswapaccount does the trick). |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 682 | |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 683 | menuconfig CGROUP_SCHED |
| 684 | bool "Group CPU scheduler" |
Daniel Lezcano | 79ae9c2 | 2010-10-27 15:34:39 -0700 | [diff] [blame] | 685 | depends on EXPERIMENTAL |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 686 | default n |
| 687 | help |
| 688 | This feature lets CPU scheduler recognize task groups and control CPU |
| 689 | bandwidth allocation to such task groups. It uses cgroups to group |
| 690 | tasks. |
| 691 | |
| 692 | if CGROUP_SCHED |
| 693 | config FAIR_GROUP_SCHED |
| 694 | bool "Group scheduling for SCHED_OTHER" |
| 695 | depends on CGROUP_SCHED |
| 696 | default CGROUP_SCHED |
| 697 | |
| 698 | config RT_GROUP_SCHED |
| 699 | bool "Group scheduling for SCHED_RR/FIFO" |
| 700 | depends on EXPERIMENTAL |
| 701 | depends on CGROUP_SCHED |
| 702 | default n |
| 703 | help |
| 704 | This feature lets you explicitly allocate real CPU bandwidth |
Li Zefan | 32bd7eb | 2010-03-24 13:17:19 +0800 | [diff] [blame] | 705 | to task groups. If enabled, it will also make it impossible to |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 706 | schedule realtime tasks for non-root users until you allocate |
| 707 | realtime bandwidth for them. |
| 708 | See Documentation/scheduler/sched-rt-group.txt for more information. |
| 709 | |
| 710 | endif #CGROUP_SCHED |
| 711 | |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 712 | config BLK_CGROUP |
| 713 | tristate "Block IO controller" |
Daniel Lezcano | 79ae9c2 | 2010-10-27 15:34:39 -0700 | [diff] [blame] | 714 | depends on BLOCK |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 715 | default n |
| 716 | ---help--- |
| 717 | Generic block IO controller cgroup interface. This is the common |
| 718 | cgroup interface which should be used by various IO controlling |
| 719 | policies. |
| 720 | |
| 721 | Currently, CFQ IO scheduler uses it to recognize task groups and |
| 722 | control disk bandwidth allocation (proportional time slice allocation) |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 723 | to such task groups. It is also used by bio throttling logic in |
| 724 | block layer to implement upper limit in IO rates on a device. |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 725 | |
| 726 | This option only enables generic Block IO controller infrastructure. |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 727 | One needs to also enable actual IO controlling logic/policy. For |
| 728 | enabling proportional weight division of disk bandwidth in CFQ seti |
| 729 | CONFIG_CFQ_GROUP_IOSCHED=y and for enabling throttling policy set |
| 730 | CONFIG_BLK_THROTTLE=y. |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 731 | |
| 732 | See Documentation/cgroups/blkio-controller.txt for more information. |
| 733 | |
| 734 | config DEBUG_BLK_CGROUP |
| 735 | bool "Enable Block IO controller debugging" |
| 736 | depends on BLK_CGROUP |
| 737 | default n |
| 738 | ---help--- |
| 739 | Enable some debugging help. Currently it exports additional stat |
| 740 | files in a cgroup which can be useful for debugging. |
| 741 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 742 | endif # CGROUPS |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 743 | |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 744 | menuconfig NAMESPACES |
Pavel Emelyanov | c5289a6 | 2008-02-08 04:18:19 -0800 | [diff] [blame] | 745 | bool "Namespaces support" if EMBEDDED |
| 746 | default !EMBEDDED |
| 747 | help |
| 748 | Provides the way to make tasks work with different objects using |
| 749 | the same id. For example same IPC id may refer to different objects |
| 750 | or same user id or pid may refer to different tasks when used in |
| 751 | different namespaces. |
| 752 | |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 753 | if NAMESPACES |
| 754 | |
Pavel Emelyanov | 58bfdd6d | 2008-02-08 04:18:21 -0800 | [diff] [blame] | 755 | config UTS_NS |
| 756 | bool "UTS namespace" |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 757 | default y |
Pavel Emelyanov | 58bfdd6d | 2008-02-08 04:18:21 -0800 | [diff] [blame] | 758 | help |
| 759 | In this namespace tasks see different info provided with the |
| 760 | uname() system call |
| 761 | |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 762 | config IPC_NS |
| 763 | bool "IPC namespace" |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 764 | depends on (SYSVIPC || POSIX_MQUEUE) |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 765 | default y |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 766 | help |
| 767 | In this namespace tasks work with IPC ids which correspond to |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 768 | different IPC objects in different namespaces. |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 769 | |
Pavel Emelyanov | aee16ce | 2008-02-08 04:18:23 -0800 | [diff] [blame] | 770 | config USER_NS |
| 771 | bool "User namespace (EXPERIMENTAL)" |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 772 | depends on EXPERIMENTAL |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 773 | default y |
Pavel Emelyanov | aee16ce | 2008-02-08 04:18:23 -0800 | [diff] [blame] | 774 | help |
| 775 | This allows containers, i.e. vservers, to use user namespaces |
| 776 | to provide different user info for different servers. |
| 777 | If unsure, say N. |
| 778 | |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 779 | config PID_NS |
Daniel Lezcano | 9bd38c2 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 780 | bool "PID Namespaces" |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 781 | default y |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 782 | help |
Heikki Orsila | 12d2b8f | 2008-07-06 15:48:02 +0300 | [diff] [blame] | 783 | Support process id namespaces. This allows having multiple |
Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 784 | processes with the same pid as long as they are in different |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 785 | pid namespaces. This is a building block of containers. |
| 786 | |
Matt Helsley | d6eb633 | 2009-01-26 12:25:55 -0800 | [diff] [blame] | 787 | config NET_NS |
| 788 | bool "Network namespace" |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 789 | depends on NET |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 790 | default y |
Matt Helsley | d6eb633 | 2009-01-26 12:25:55 -0800 | [diff] [blame] | 791 | help |
| 792 | Allow user space to create what appear to be multiple instances |
| 793 | of the network stack. |
| 794 | |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 795 | endif # NAMESPACES |
| 796 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 797 | config SCHED_AUTOGROUP |
| 798 | bool "Automatic process group scheduling" |
| 799 | select EVENTFD |
| 800 | select CGROUPS |
| 801 | select CGROUP_SCHED |
| 802 | select FAIR_GROUP_SCHED |
| 803 | help |
| 804 | This option optimizes the scheduler for common desktop workloads by |
| 805 | automatically creating and populating task groups. This separation |
| 806 | of workloads isolates aggressive CPU burners (like build jobs) from |
| 807 | desktop applications. Task group autogeneration is currently based |
| 808 | upon task session. |
| 809 | |
Daniel Lezcano | 7af37be | 2010-10-27 15:34:41 -0700 | [diff] [blame] | 810 | config MM_OWNER |
| 811 | bool |
| 812 | |
| 813 | config SYSFS_DEPRECATED |
| 814 | bool "enable deprecated sysfs features to support old userspace tools" |
| 815 | depends on SYSFS |
| 816 | default n |
| 817 | help |
| 818 | This option adds code that switches the layout of the "block" class |
| 819 | devices, to not show up in /sys/class/block/, but only in |
| 820 | /sys/block/. |
| 821 | |
| 822 | This switch is only active when the sysfs.deprecated=1 boot option is |
| 823 | passed or the SYSFS_DEPRECATED_V2 option is set. |
| 824 | |
| 825 | This option allows new kernels to run on old distributions and tools, |
| 826 | which might get confused by /sys/class/block/. Since 2007/2008 all |
| 827 | major distributions and tools handle this just fine. |
| 828 | |
| 829 | Recent distributions and userspace tools after 2009/2010 depend on |
| 830 | the existence of /sys/class/block/, and will not work with this |
| 831 | option enabled. |
| 832 | |
| 833 | Only if you are using a new kernel on an old distribution, you might |
| 834 | need to say Y here. |
| 835 | |
| 836 | config SYSFS_DEPRECATED_V2 |
| 837 | bool "enabled deprecated sysfs features by default" |
| 838 | default n |
| 839 | depends on SYSFS |
| 840 | depends on SYSFS_DEPRECATED |
| 841 | help |
| 842 | Enable deprecated sysfs by default. |
| 843 | |
| 844 | See the CONFIG_SYSFS_DEPRECATED option for more details about this |
| 845 | option. |
| 846 | |
| 847 | Only if you are using a new kernel on an old distribution, you might |
| 848 | need to say Y here. Even then, odds are you would not need it |
| 849 | enabled, you can always pass the boot option if absolutely necessary. |
| 850 | |
| 851 | config RELAY |
| 852 | bool "Kernel->user space relay support (formerly relayfs)" |
| 853 | help |
| 854 | This option enables support for relay interface support in |
| 855 | certain file systems (such as debugfs). |
| 856 | It is designed to provide an efficient mechanism for tools and |
| 857 | facilities to relay large amounts of data from kernel space to |
| 858 | user space. |
| 859 | |
| 860 | If unsure, say N. |
| 861 | |
Dimitri Gorokhovik | f991633 | 2007-03-06 01:42:17 -0800 | [diff] [blame] | 862 | config BLK_DEV_INITRD |
| 863 | bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" |
| 864 | depends on BROKEN || !FRV |
| 865 | help |
| 866 | The initial RAM filesystem is a ramfs which is loaded by the |
| 867 | boot loader (loadlin or lilo) and that is mounted as root |
| 868 | before the normal boot procedure. It is typically used to |
| 869 | load modules needed to mount the "real" root file system, |
| 870 | etc. See <file:Documentation/initrd.txt> for details. |
| 871 | |
| 872 | If RAM disk support (BLK_DEV_RAM) is also included, this |
| 873 | also enables initial RAM disk (initrd) support and adds |
| 874 | 15 Kbytes (more on some other architectures) to the kernel size. |
| 875 | |
| 876 | If unsure say Y. |
| 877 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 878 | if BLK_DEV_INITRD |
| 879 | |
Sam Ravnborg | dbec486 | 2005-08-10 20:44:50 +0200 | [diff] [blame] | 880 | source "usr/Kconfig" |
| 881 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 882 | endif |
| 883 | |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 884 | config CC_OPTIMIZE_FOR_SIZE |
Ingo Molnar | 96fffeb | 2008-04-28 01:39:43 +0200 | [diff] [blame] | 885 | bool "Optimize for size" |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 886 | default y |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 887 | help |
| 888 | Enabling this option will pass "-Os" instead of "-O2" to gcc |
| 889 | resulting in a smaller kernel. |
| 890 | |
jkacur | 775a722 | 2008-07-16 00:31:16 +0200 | [diff] [blame] | 891 | If unsure, say Y. |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 892 | |
Randy Dunlap | 0847062 | 2006-09-30 23:28:13 -0700 | [diff] [blame] | 893 | config SYSCTL |
| 894 | bool |
| 895 | |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 896 | config ANON_INODES |
| 897 | bool |
| 898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | menuconfig EMBEDDED |
| 900 | bool "Configure standard kernel features (for small systems)" |
| 901 | help |
| 902 | This option allows certain base kernel options and settings |
| 903 | to be disabled or tweaked. This is for specialized |
| 904 | environments which can tolerate a "non-standard" kernel. |
| 905 | Only use this if you really know what you are doing. |
| 906 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 907 | config UID16 |
| 908 | bool "Enable 16-bit UID system calls" if EMBEDDED |
David S. Miller | 09337f5 | 2008-04-26 03:17:12 -0700 | [diff] [blame] | 909 | depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 910 | default y |
| 911 | help |
| 912 | This enables the legacy 16-bit UID syscall wrappers. |
| 913 | |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 914 | config SYSCTL_SYSCALL |
Randy Dunlap | 0847062 | 2006-09-30 23:28:13 -0700 | [diff] [blame] | 915 | bool "Sysctl syscall support" if EMBEDDED |
Eric W. Biederman | 26a7034 | 2009-11-05 05:26:41 -0800 | [diff] [blame] | 916 | depends on PROC_SYSCTL |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 917 | default y |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 918 | select SYSCTL |
| 919 | ---help--- |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 920 | sys_sysctl uses binary paths that have been found challenging |
| 921 | to properly maintain and use. The interface in /proc/sys |
| 922 | using paths with ascii names is now the primary path to this |
| 923 | information. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 924 | |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 925 | Almost nothing using the binary sysctl interface so if you are |
| 926 | trying to save some space it is probably safe to disable this, |
| 927 | making your kernel marginally smaller. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 928 | |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 929 | If unsure say Y here. |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | config KALLSYMS |
Jesper Juhl | 979c6a1 | 2006-12-12 19:25:11 +0100 | [diff] [blame] | 932 | bool "Load all symbols for debugging/ksymoops" if EMBEDDED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | default y |
| 934 | help |
| 935 | Say Y here to let the kernel print out symbolic crash information and |
| 936 | symbolic stack backtraces. This increases the size of the kernel |
| 937 | somewhat, as all symbols have to be loaded into the kernel image. |
| 938 | |
| 939 | config KALLSYMS_ALL |
| 940 | bool "Include all symbols in kallsyms" |
| 941 | depends on DEBUG_KERNEL && KALLSYMS |
| 942 | help |
| 943 | Normally kallsyms only contains the symbols of functions, for nicer |
| 944 | OOPS messages. Some debuggers can use kallsyms for other |
Jesper Juhl | f9f97bc | 2005-07-20 05:43:05 +0200 | [diff] [blame] | 945 | symbols too: say Y here to include all symbols, if you need them |
| 946 | and you don't care about adding 300k to the size of your kernel. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
| 948 | Say N. |
| 949 | |
| 950 | config KALLSYMS_EXTRA_PASS |
| 951 | bool "Do an extra kallsyms pass" |
| 952 | depends on KALLSYMS |
| 953 | help |
| 954 | If kallsyms is not working correctly, the build will fail with |
| 955 | inconsistent kallsyms data. If that occurs, log a bug report and |
| 956 | turn on KALLSYMS_EXTRA_PASS which should result in a stable build. |
| 957 | Always say N here unless you find a bug in kallsyms, which must be |
| 958 | reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while |
| 959 | you wait for kallsyms to be fixed. |
| 960 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 961 | |
Greg Kroah-Hartman | 712f47c | 2005-11-16 11:27:07 -0800 | [diff] [blame] | 962 | config HOTPLUG |
| 963 | bool "Support for hot-pluggable devices" if EMBEDDED |
| 964 | default y |
| 965 | help |
| 966 | This option is provided for the case where no hotplug or uevent |
| 967 | capabilities is wanted by the kernel. You should only consider |
| 968 | disabling this option for embedded systems that do not use modules, a |
| 969 | dynamic /dev tree, or dynamic device discovery. Just say Y. |
| 970 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 971 | config PRINTK |
| 972 | default y |
| 973 | bool "Enable support for printk" if EMBEDDED |
| 974 | help |
| 975 | This option enables normal printk support. Removing it |
| 976 | eliminates most of the message strings from the kernel image |
| 977 | and makes the kernel more or less silent. As this makes it |
| 978 | very difficult to diagnose system problems, saying N here is |
| 979 | strongly discouraged. |
| 980 | |
Matt Mackall | c8538a7 | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 981 | config BUG |
| 982 | bool "BUG() support" if EMBEDDED |
| 983 | default y |
| 984 | help |
| 985 | Disabling this option eliminates support for BUG and WARN, reducing |
| 986 | the size of your kernel image and potentially quietly ignoring |
| 987 | numerous fatal conditions. You should only consider disabling this |
| 988 | option for embedded systems with no facilities for reporting errors. |
| 989 | Just say Y. |
| 990 | |
Matt Mackall | 708e9a7 | 2006-01-08 01:05:25 -0800 | [diff] [blame] | 991 | config ELF_CORE |
| 992 | default y |
| 993 | bool "Enable ELF core dumps" if EMBEDDED |
| 994 | help |
| 995 | Enable support for generating core dumps. Disabling saves about 4k. |
| 996 | |
Stas Sergeev | e5e1d3c | 2008-05-07 12:39:56 +0200 | [diff] [blame] | 997 | config PCSPKR_PLATFORM |
| 998 | bool "Enable PC-Speaker support" if EMBEDDED |
| 999 | depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES |
| 1000 | default y |
| 1001 | help |
| 1002 | This option allows to disable the internal PC-Speaker |
| 1003 | support, saving some memory. |
| 1004 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | config BASE_FULL |
| 1006 | default y |
| 1007 | bool "Enable full-sized data structures for core" if EMBEDDED |
| 1008 | help |
| 1009 | Disabling this option reduces the size of miscellaneous core |
| 1010 | kernel data structures. This saves memory on small machines, |
| 1011 | but may reduce performance. |
| 1012 | |
| 1013 | config FUTEX |
| 1014 | bool "Enable futex support" if EMBEDDED |
| 1015 | default y |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1016 | select RT_MUTEXES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | help |
| 1018 | Disabling this option will cause the kernel to be built without |
| 1019 | support for "fast userspace mutexes". The resulting kernel may not |
| 1020 | run glibc-based applications correctly. |
| 1021 | |
| 1022 | config EPOLL |
| 1023 | bool "Enable eventpoll support" if EMBEDDED |
| 1024 | default y |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1025 | select ANON_INODES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | help |
| 1027 | Disabling this option will cause the kernel to be built without |
| 1028 | support for epoll family of system calls. |
| 1029 | |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 1030 | config SIGNALFD |
| 1031 | bool "Enable signalfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1032 | select ANON_INODES |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 1033 | default y |
| 1034 | help |
| 1035 | Enable the signalfd() system call that allows to receive signals |
| 1036 | on a file descriptor. |
| 1037 | |
| 1038 | If unsure, say Y. |
| 1039 | |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 1040 | config TIMERFD |
| 1041 | bool "Enable timerfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1042 | select ANON_INODES |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 1043 | default y |
| 1044 | help |
| 1045 | Enable the timerfd() system call that allows to receive timer |
| 1046 | events on a file descriptor. |
| 1047 | |
| 1048 | If unsure, say Y. |
| 1049 | |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 1050 | config EVENTFD |
| 1051 | bool "Enable eventfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1052 | select ANON_INODES |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 1053 | default y |
| 1054 | help |
| 1055 | Enable the eventfd() system call that allows to receive both |
| 1056 | kernel notification (ie. KAIO) or userspace notifications. |
| 1057 | |
| 1058 | If unsure, say Y. |
| 1059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | config SHMEM |
| 1061 | bool "Use full shmem filesystem" if EMBEDDED |
| 1062 | default y |
| 1063 | depends on MMU |
| 1064 | help |
| 1065 | The shmem is an internal filesystem used to manage shared memory. |
| 1066 | It is backed by swap and manages resource limits. It is also exported |
| 1067 | to userspace as tmpfs if TMPFS is enabled. Disabling this |
| 1068 | option replaces shmem and tmpfs with the much simpler ramfs code, |
| 1069 | which may be appropriate on small systems without swap. |
| 1070 | |
Thomas Petazzoni | ebf3f09 | 2008-10-15 22:05:12 -0700 | [diff] [blame] | 1071 | config AIO |
| 1072 | bool "Enable AIO support" if EMBEDDED |
| 1073 | default y |
| 1074 | help |
| 1075 | This option enables POSIX asynchronous I/O which may by used |
| 1076 | by some high performance threaded applications. Disabling |
| 1077 | this option saves about 7k. |
| 1078 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1079 | config HAVE_PERF_EVENTS |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1080 | bool |
Mike Frysinger | 018df72 | 2009-06-12 13:17:43 -0400 | [diff] [blame] | 1081 | help |
| 1082 | See tools/perf/design.txt for details. |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1083 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 1084 | config PERF_USE_VMALLOC |
| 1085 | bool |
| 1086 | help |
| 1087 | See tools/perf/design.txt for details |
| 1088 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1089 | menu "Kernel Performance Events And Counters" |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1090 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1091 | config PERF_EVENTS |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1092 | bool "Kernel performance events and counters" |
| 1093 | default y if (PROFILING || PERF_COUNTERS) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1094 | depends on HAVE_PERF_EVENTS |
Ingo Molnar | 4c59e46 | 2008-12-08 19:38:33 +0100 | [diff] [blame] | 1095 | select ANON_INODES |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 1096 | select IRQ_WORK |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1097 | help |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1098 | Enable kernel support for various performance events provided |
| 1099 | by software and hardware. |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1100 | |
Thadeu Lima de Souza Cascardo | dd77038 | 2009-10-30 19:32:25 -0200 | [diff] [blame] | 1101 | Software events are supported either built-in or via the |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1102 | use of generic tracepoints. |
| 1103 | |
| 1104 | Most modern CPUs support performance events via performance |
| 1105 | counter registers. These registers count the number of certain |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1106 | types of hw events: such as instructions executed, cachemisses |
| 1107 | suffered, or branches mis-predicted - without slowing down the |
| 1108 | kernel or applications. These registers can also trigger interrupts |
| 1109 | when a threshold number of events have passed - and can thus be |
| 1110 | used to profile the code that runs on that CPU. |
| 1111 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1112 | The Linux Performance Event subsystem provides an abstraction of |
Thadeu Lima de Souza Cascardo | dd77038 | 2009-10-30 19:32:25 -0200 | [diff] [blame] | 1113 | these software and hardware event capabilities, available via a |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1114 | system call and used by the "perf" utility in tools/perf/. It |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1115 | provides per task and per CPU counters, and it provides event |
| 1116 | capabilities on top of those. |
| 1117 | |
| 1118 | Say Y if unsure. |
| 1119 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1120 | config PERF_COUNTERS |
| 1121 | bool "Kernel performance counters (old config option)" |
| 1122 | depends on HAVE_PERF_EVENTS |
| 1123 | help |
| 1124 | This config has been obsoleted by the PERF_EVENTS |
| 1125 | config option - please see that one for details. |
| 1126 | |
| 1127 | It has no effect on the kernel whether you enable |
| 1128 | it or not, it is a compatibility placeholder. |
| 1129 | |
| 1130 | Say N if unsure. |
| 1131 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 1132 | config DEBUG_PERF_USE_VMALLOC |
| 1133 | default n |
| 1134 | bool "Debug: use vmalloc to back perf mmap() buffers" |
| 1135 | depends on PERF_EVENTS && DEBUG_KERNEL |
| 1136 | select PERF_USE_VMALLOC |
| 1137 | help |
| 1138 | Use vmalloc memory to back perf mmap() buffers. |
| 1139 | |
| 1140 | Mostly useful for debugging the vmalloc code on platforms |
| 1141 | that don't require it. |
| 1142 | |
| 1143 | Say N if unsure. |
| 1144 | |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1145 | endmenu |
| 1146 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1147 | config VM_EVENT_COUNTERS |
| 1148 | default y |
| 1149 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED |
| 1150 | help |
Paul Jackson | 2aea4fb | 2006-12-22 01:06:10 -0800 | [diff] [blame] | 1151 | VM event counters are needed for event counts to be shown. |
| 1152 | This option allows the disabling of the VM event counters |
| 1153 | on EMBEDDED systems. /proc/vmstat will only show page counts |
| 1154 | if VM event counters are disabled. |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1155 | |
Thomas Petazzoni | 3d13731 | 2008-08-19 10:28:24 +0200 | [diff] [blame] | 1156 | config PCI_QUIRKS |
| 1157 | default y |
Geert Uytterhoeven | 61cfc7e | 2008-10-22 08:53:25 +0200 | [diff] [blame] | 1158 | bool "Enable PCI quirk workarounds" if EMBEDDED |
| 1159 | depends on PCI |
Thomas Petazzoni | 3d13731 | 2008-08-19 10:28:24 +0200 | [diff] [blame] | 1160 | help |
| 1161 | This enables workarounds for various PCI chipset |
| 1162 | bugs/quirks. Disable this only if your target machine is |
| 1163 | unaffected by PCI quirks. |
| 1164 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1165 | config SLUB_DEBUG |
| 1166 | default y |
| 1167 | bool "Enable SLUB debugging support" if EMBEDDED |
Christoph Lameter | f6acb63 | 2008-04-29 16:16:06 -0700 | [diff] [blame] | 1168 | depends on SLUB && SYSFS |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1169 | help |
| 1170 | SLUB has extensive debug support features. Disabling these can |
| 1171 | result in significant savings in code size. This also disables |
| 1172 | SLUB sysfs support. /sys/slab will not exist and there will be |
| 1173 | no support for cache validation etc. |
| 1174 | |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 1175 | config COMPAT_BRK |
| 1176 | bool "Disable heap randomization" |
| 1177 | default y |
| 1178 | help |
| 1179 | Randomizing heap placement makes heap exploits harder, but it |
| 1180 | also breaks ancient binaries (including anything libc5 based). |
| 1181 | This option changes the bootup default to heap randomization |
Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 1182 | disabled, and can be overridden at runtime by setting |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 1183 | /proc/sys/kernel/randomize_va_space to 2. |
| 1184 | |
| 1185 | On non-ancient distros (post-2000 ones) N is usually a safe choice. |
| 1186 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1187 | choice |
| 1188 | prompt "Choose SLAB allocator" |
Christoph Lameter | a0acd82 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 1189 | default SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1190 | help |
| 1191 | This option allows to select a slab allocator. |
| 1192 | |
| 1193 | config SLAB |
| 1194 | bool "SLAB" |
| 1195 | help |
| 1196 | The regular slab allocator that is established and known to work |
Christoph Lameter | 3401388 | 2007-05-09 02:32:47 -0700 | [diff] [blame] | 1197 | well in all environments. It organizes cache hot objects in |
Simon Arlott | 02f5621 | 2008-11-05 22:18:19 +0000 | [diff] [blame] | 1198 | per cpu and per node queues. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1199 | |
| 1200 | config SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1201 | bool "SLUB (Unqueued Allocator)" |
| 1202 | help |
| 1203 | SLUB is a slab allocator that minimizes cache line usage |
| 1204 | instead of managing queues of cached objects (SLAB approach). |
| 1205 | Per cpu caching is realized using slabs of objects instead |
| 1206 | of queues of objects. SLUB can use memory efficiently |
Simon Arlott | 02f5621 | 2008-11-05 22:18:19 +0000 | [diff] [blame] | 1207 | and has enhanced diagnostics. SLUB is the default choice for |
| 1208 | a slab allocator. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1209 | |
| 1210 | config SLOB |
Paul Mundt | 84a01c2 | 2007-07-15 23:38:24 -0700 | [diff] [blame] | 1211 | depends on EMBEDDED |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1212 | bool "SLOB (Simple Allocator)" |
| 1213 | help |
Matt Mackall | 3729145 | 2008-02-04 22:29:38 -0800 | [diff] [blame] | 1214 | SLOB replaces the stock allocator with a drastically simpler |
| 1215 | allocator. SLOB is generally more space efficient but |
| 1216 | does not perform as well on large systems. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1217 | |
| 1218 | endchoice |
| 1219 | |
Jie Zhang | ea63763 | 2009-12-14 18:00:02 -0800 | [diff] [blame] | 1220 | config MMAP_ALLOW_UNINITIALIZED |
| 1221 | bool "Allow mmapped anonymous memory to be uninitialized" |
| 1222 | depends on EMBEDDED && !MMU |
| 1223 | default n |
| 1224 | help |
| 1225 | Normally, and according to the Linux spec, anonymous memory obtained |
| 1226 | from mmap() has it's contents cleared before it is passed to |
| 1227 | userspace. Enabling this config option allows you to request that |
| 1228 | mmap() skip that if it is given an MAP_UNINITIALIZED flag, thus |
| 1229 | providing a huge performance boost. If this option is not enabled, |
| 1230 | then the flag will be ignored. |
| 1231 | |
| 1232 | This is taken advantage of by uClibc's malloc(), and also by |
| 1233 | ELF-FDPIC binfmt's brk and stack allocator. |
| 1234 | |
| 1235 | Because of the obvious security issues, this option should only be |
| 1236 | enabled on embedded devices where you control what is run in |
| 1237 | userspace. Since that isn't generally a problem on no-MMU systems, |
| 1238 | it is normally safe to say Y here. |
| 1239 | |
| 1240 | See Documentation/nommu-mmap.txt for more information. |
| 1241 | |
Mathieu Desnoyers | 125e564 | 2008-02-02 15:10:36 -0500 | [diff] [blame] | 1242 | config PROFILING |
Robert Richter | b309a29 | 2010-02-26 15:01:23 +0100 | [diff] [blame] | 1243 | bool "Profiling support" |
Mathieu Desnoyers | 125e564 | 2008-02-02 15:10:36 -0500 | [diff] [blame] | 1244 | help |
| 1245 | Say Y here to enable the extended profiling support mechanisms used |
| 1246 | by profilers such as OProfile. |
| 1247 | |
Ingo Molnar | 5f87f11 | 2008-07-23 14:15:22 +0200 | [diff] [blame] | 1248 | # |
| 1249 | # Place an empty function call at each tracepoint site. Can be |
| 1250 | # dynamically changed for a probe function. |
| 1251 | # |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 1252 | config TRACEPOINTS |
Ingo Molnar | 5f87f11 | 2008-07-23 14:15:22 +0200 | [diff] [blame] | 1253 | bool |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 1254 | |
Mathieu Desnoyers | fb32e03 | 2008-02-02 15:10:33 -0500 | [diff] [blame] | 1255 | source "arch/Kconfig" |
| 1256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | endmenu # General setup |
| 1258 | |
Dmitry Baryshkov | ee7e551 | 2008-06-29 14:18:46 +0400 | [diff] [blame] | 1259 | config HAVE_GENERIC_DMA_COHERENT |
| 1260 | bool |
| 1261 | default n |
| 1262 | |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 1263 | config SLABINFO |
| 1264 | bool |
| 1265 | depends on PROC_FS |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1266 | depends on SLAB || SLUB_DEBUG |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 1267 | default y |
| 1268 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 1269 | config RT_MUTEXES |
| 1270 | boolean |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 1271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | config BASE_SMALL |
| 1273 | int |
| 1274 | default 0 if BASE_FULL |
| 1275 | default 1 if !BASE_FULL |
| 1276 | |
Jan Engelhardt | 66da573 | 2007-07-15 23:39:29 -0700 | [diff] [blame] | 1277 | menuconfig MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | bool "Enable loadable module support" |
| 1279 | help |
| 1280 | Kernel modules are small pieces of compiled code which can |
| 1281 | be inserted in the running kernel, rather than being |
| 1282 | permanently built into the kernel. You use the "modprobe" |
| 1283 | tool to add (and sometimes remove) them. If you say Y here, |
| 1284 | many parts of the kernel can be built as modules (by |
| 1285 | answering M instead of Y where indicated): this is most |
| 1286 | useful for infrequently used options which are not required |
| 1287 | for booting. For more information, see the man pages for |
| 1288 | modprobe, lsmod, modinfo, insmod and rmmod. |
| 1289 | |
| 1290 | If you say Y here, you will need to run "make |
| 1291 | modules_install" to put the modules under /lib/modules/ |
| 1292 | where modprobe can find them (you may need to be root to do |
| 1293 | this). |
| 1294 | |
| 1295 | If unsure, say Y. |
| 1296 | |
Robert P. J. Day | 0b0de14 | 2008-08-04 13:31:32 -0400 | [diff] [blame] | 1297 | if MODULES |
| 1298 | |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1299 | config MODULE_FORCE_LOAD |
| 1300 | bool "Forced module loading" |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1301 | default n |
| 1302 | help |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1303 | Allow loading of modules without version information (ie. modprobe |
| 1304 | --force). Forced module loading sets the 'F' (forced) taint flag and |
| 1305 | is usually a really bad idea. |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | config MODULE_UNLOAD |
| 1308 | bool "Module unloading" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | help |
| 1310 | Without this option you will not be able to unload any |
| 1311 | modules (note that some modules may not be unloadable |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 1312 | anyway), which makes your kernel smaller, faster |
| 1313 | and simpler. If unsure, say Y. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | |
| 1315 | config MODULE_FORCE_UNLOAD |
| 1316 | bool "Forced module unloading" |
| 1317 | depends on MODULE_UNLOAD && EXPERIMENTAL |
| 1318 | help |
| 1319 | This option allows you to force a module to unload, even if the |
| 1320 | kernel believes it is unsafe: the kernel will remove the module |
| 1321 | without waiting for anyone to stop using it (using the -f option to |
| 1322 | rmmod). This is mainly for kernel developers and desperate users. |
| 1323 | If unsure, say N. |
| 1324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | config MODVERSIONS |
Sam Ravnborg | 0d54164 | 2005-12-26 23:04:02 +0100 | [diff] [blame] | 1326 | bool "Module versioning support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | help |
| 1328 | Usually, you have to use modules compiled with your kernel. |
| 1329 | Saying Y here makes it sometimes possible to use modules |
| 1330 | compiled for different kernels, by adding enough information |
| 1331 | to the modules to (hopefully) spot any changes which would |
| 1332 | make them incompatible with the kernel you are running. If |
| 1333 | unsure, say N. |
| 1334 | |
| 1335 | config MODULE_SRCVERSION_ALL |
| 1336 | bool "Source checksum for all modules" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | help |
| 1338 | Modules which contain a MODULE_VERSION get an extra "srcversion" |
| 1339 | field inserted into their modinfo section, which contains a |
| 1340 | sum of the source files which made it. This helps maintainers |
| 1341 | see exactly which source was used to build a module (since |
| 1342 | others sometimes change the module source without updating |
| 1343 | the version). With this option, such a "srcversion" field |
| 1344 | will be created for all modules. If unsure, say N. |
| 1345 | |
Robert P. J. Day | 0b0de14 | 2008-08-04 13:31:32 -0400 | [diff] [blame] | 1346 | endif # MODULES |
| 1347 | |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 1348 | config INIT_ALL_POSSIBLE |
| 1349 | bool |
| 1350 | help |
| 1351 | Back when each arch used to define their own cpu_online_map and |
| 1352 | cpu_possible_map, some of them chose to initialize cpu_possible_map |
| 1353 | with all 1s, and others with all 0s. When they were centralised, |
| 1354 | it was better to provide this option than to break all the archs |
Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 1355 | and have several arch maintainers pursuing me down dark alleys. |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 1356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | config STOP_MACHINE |
| 1358 | bool |
| 1359 | default y |
| 1360 | depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU |
| 1361 | help |
| 1362 | Need stop_machine() primitive. |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 1363 | |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 1364 | source "block/Kconfig" |
Avi Kivity | e98c320 | 2007-10-16 23:27:31 -0700 | [diff] [blame] | 1365 | |
| 1366 | config PREEMPT_NOTIFIERS |
| 1367 | bool |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1368 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1369 | config PADATA |
| 1370 | depends on SMP |
| 1371 | bool |
| 1372 | |
Thomas Gleixner | 6beb000 | 2009-11-09 15:21:34 +0000 | [diff] [blame] | 1373 | source "kernel/Kconfig.locks" |