Roman Zippel | 80daa560 | 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 | b99b87f7 | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 19 | config CONSTRUCTORS |
| 20 | bool |
| 21 | depends on !UML |
Peter Oberparleiter | b99b87f7 | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 22 | |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 23 | config HAVE_IRQ_WORK |
| 24 | bool |
| 25 | |
| 26 | config IRQ_WORK |
| 27 | bool |
| 28 | depends on HAVE_IRQ_WORK |
| 29 | |
Al Boldi | ff0cfc6 | 2007-07-31 00:39:23 -0700 | [diff] [blame] | 30 | menu "General setup" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | config EXPERIMENTAL |
| 33 | bool "Prompt for development and/or incomplete code/drivers" |
| 34 | ---help--- |
| 35 | Some of the various things that Linux supports (such as network |
| 36 | drivers, file systems, network protocols, etc.) can be in a state |
| 37 | of development where the functionality, stability, or the level of |
| 38 | testing is not yet high enough for general use. This is usually |
| 39 | known as the "alpha-test" phase among developers. If a feature is |
| 40 | currently in alpha-test, then the developers usually discourage |
| 41 | uninformed widespread use of this feature by the general public to |
| 42 | avoid "Why doesn't this work?" type mail messages. However, active |
| 43 | testing and use of these systems is welcomed. Just be aware that it |
| 44 | may not meet the normal level of reliability or it may fail to work |
| 45 | in some special cases. Detailed bug reports from people familiar |
| 46 | with the kernel internals are usually welcomed by the developers |
| 47 | (before submitting bug reports, please read the documents |
| 48 | <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, |
| 49 | <file:Documentation/BUG-HUNTING>, and |
| 50 | <file:Documentation/oops-tracing.txt> in the kernel source). |
| 51 | |
| 52 | This option will also make obsoleted drivers available. These are |
| 53 | drivers that have been replaced by something else, and/or are |
| 54 | scheduled to be removed in a future kernel release. |
| 55 | |
| 56 | Unless you intend to help test and develop a feature or driver that |
| 57 | falls into this category, or you have a situation that requires |
| 58 | using these features, you should probably say N here, which will |
| 59 | cause the configurator to present you with fewer choices. If |
| 60 | you say Y here, you will be offered the choice of using features or |
| 61 | drivers that are currently considered to be in the alpha-test phase. |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | config BROKEN |
| 64 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | config BROKEN_ON_SMP |
| 67 | bool |
| 68 | depends on BROKEN || !SMP |
| 69 | default y |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | config INIT_ENV_ARG_LIMIT |
| 72 | int |
Adrian Bunk | dd673bc | 2006-06-30 01:55:51 -0700 | [diff] [blame] | 73 | default 32 if !UML |
| 74 | default 128 if UML |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | help |
Randy Dunlap | 34ad92c2 | 2005-10-30 15:01:46 -0800 | [diff] [blame] | 76 | Maximum of each of the number of arguments and environment |
| 77 | variables passed to init from the kernel command line. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Roland McGrath | 8433646 | 2009-12-21 16:24:06 -0800 | [diff] [blame] | 80 | config CROSS_COMPILE |
| 81 | string "Cross-compiler tool prefix" |
| 82 | help |
| 83 | Same as running 'make CROSS_COMPILE=prefix-' but stored for |
| 84 | default make runs in this kernel build directory. You don't |
| 85 | need to set this unless you want the configured kernel build |
| 86 | directory to select the cross-compiler automatically. |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | config LOCALVERSION |
| 89 | string "Local version - append to kernel release" |
| 90 | help |
| 91 | Append an extra string to the end of your kernel version. |
| 92 | This will show up when you type uname, for example. |
| 93 | The string you set here will be appended after the contents of |
| 94 | any files with a filename matching localversion* in your |
| 95 | object and source tree, in that order. Your total string can |
| 96 | be a maximum of 64 characters. |
| 97 | |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 98 | config LOCALVERSION_AUTO |
| 99 | bool "Automatically append version information to the version string" |
| 100 | default y |
| 101 | help |
| 102 | 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] | 103 | release tree by looking for git tags that belong to the current |
| 104 | top of tree revision. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 105 | |
| 106 | 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] | 107 | 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] | 108 | appended after any matching localversion* files, and after the value |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 109 | set in CONFIG_LOCALVERSION. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 110 | |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 111 | (The actual string used here is the first eight characters produced |
| 112 | by running the command: |
| 113 | |
| 114 | $ git rev-parse --verify HEAD |
| 115 | |
| 116 | which is done within the script "scripts/setlocalversion".) |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 117 | |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 118 | config HAVE_KERNEL_GZIP |
| 119 | bool |
| 120 | |
| 121 | config HAVE_KERNEL_BZIP2 |
| 122 | bool |
| 123 | |
| 124 | config HAVE_KERNEL_LZMA |
| 125 | bool |
| 126 | |
Lasse Collin | 3ebe124 | 2011-01-12 17:01:23 -0800 | [diff] [blame] | 127 | config HAVE_KERNEL_XZ |
| 128 | bool |
| 129 | |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 130 | config HAVE_KERNEL_LZO |
| 131 | bool |
| 132 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 133 | choice |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 134 | prompt "Kernel compression mode" |
| 135 | default KERNEL_GZIP |
Lasse Collin | 3ebe124 | 2011-01-12 17:01:23 -0800 | [diff] [blame] | 136 | depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 137 | help |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 138 | The linux kernel is a kind of self-extracting executable. |
| 139 | Several compression algorithms are available, which differ |
| 140 | in efficiency, compression and decompression speed. |
| 141 | Compression speed is only relevant when building a kernel. |
| 142 | Decompression speed is relevant at each boot. |
| 143 | |
| 144 | If you have any problems with bzip2 or lzma compressed |
| 145 | kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older |
| 146 | version of this functionality (bzip2 only), for 2.4, was |
| 147 | supplied by Christian Ludwig) |
| 148 | |
| 149 | High compression options are mostly useful for users, who |
| 150 | are low on disk space (embedded systems), but for whom ram |
| 151 | size matters less. |
| 152 | |
| 153 | If in doubt, select 'gzip' |
| 154 | |
| 155 | config KERNEL_GZIP |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 156 | bool "Gzip" |
| 157 | depends on HAVE_KERNEL_GZIP |
| 158 | help |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 159 | The old and tried gzip compression. It provides a good balance |
| 160 | between compression ratio and decompression speed. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 161 | |
| 162 | config KERNEL_BZIP2 |
| 163 | bool "Bzip2" |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 164 | depends on HAVE_KERNEL_BZIP2 |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 165 | help |
| 166 | Its compression ratio and speed is intermediate. |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 167 | Decompression speed is slowest among the three. The kernel |
| 168 | size is about 10% smaller with bzip2, in comparison to gzip. |
| 169 | Bzip2 uses a large amount of memory. For modern kernels you |
| 170 | will need at least 8MB RAM or more for booting. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 171 | |
| 172 | config KERNEL_LZMA |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 173 | bool "LZMA" |
| 174 | depends on HAVE_KERNEL_LZMA |
| 175 | help |
| 176 | The most recent compression algorithm. |
| 177 | Its ratio is best, decompression speed is between the other |
| 178 | two. Compression is slowest. The kernel size is about 33% |
| 179 | smaller with LZMA in comparison to gzip. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 180 | |
Lasse Collin | 3ebe124 | 2011-01-12 17:01:23 -0800 | [diff] [blame] | 181 | config KERNEL_XZ |
| 182 | bool "XZ" |
| 183 | depends on HAVE_KERNEL_XZ |
| 184 | help |
| 185 | XZ uses the LZMA2 algorithm and instruction set specific |
| 186 | BCJ filters which can improve compression ratio of executable |
| 187 | code. The size of the kernel is about 30% smaller with XZ in |
| 188 | comparison to gzip. On architectures for which there is a BCJ |
| 189 | filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ |
| 190 | will create a few percent smaller kernel than plain LZMA. |
| 191 | |
| 192 | The speed is about the same as with LZMA: The decompression |
| 193 | speed of XZ is better than that of bzip2 but worse than gzip |
| 194 | and LZO. Compression is slow. |
| 195 | |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 196 | config KERNEL_LZO |
| 197 | bool "LZO" |
| 198 | depends on HAVE_KERNEL_LZO |
| 199 | help |
| 200 | Its compression ratio is the poorest among the 4. The kernel |
Stephan Sperber | 681b304 | 2010-07-14 11:23:08 +0200 | [diff] [blame] | 201 | size is about 10% bigger than gzip; however its speed |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 202 | (both compression and decompression) is the fastest. |
| 203 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 204 | endchoice |
| 205 | |
Josh Triplett | bd5dc17 | 2011-06-15 15:08:28 -0700 | [diff] [blame] | 206 | config DEFAULT_HOSTNAME |
| 207 | string "Default hostname" |
| 208 | default "(none)" |
| 209 | help |
| 210 | This option determines the default system hostname before userspace |
| 211 | calls sethostname(2). The kernel traditionally uses "(none)" here, |
| 212 | but you may wish to use a different default here to make a minimal |
| 213 | system more usable with less configuration. |
| 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | config SWAP |
| 216 | bool "Support for paging of anonymous memory (swap)" |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 217 | depends on MMU && BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | default y |
| 219 | help |
| 220 | This option allows you to choose whether you want to have support |
Jesper Juhl | 92c3504 | 2006-01-15 02:40:08 +0100 | [diff] [blame] | 221 | 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] | 222 | used to provide more virtual memory than the actual RAM present |
| 223 | in your computer. If unsure say Y. |
| 224 | |
| 225 | config SYSVIPC |
| 226 | bool "System V IPC" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | ---help--- |
| 228 | Inter Process Communication is a suite of library functions and |
| 229 | system calls which let processes (running programs) synchronize and |
| 230 | exchange information. It is generally considered to be a good thing, |
| 231 | and some programs won't run unless you say Y here. In particular, if |
| 232 | you want to run the DOS emulator dosemu under Linux (read the |
| 233 | DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), |
| 234 | you'll need to say Y here. |
| 235 | |
| 236 | You can find documentation about IPC with "info ipc" and also in |
| 237 | section 6.4 of the Linux Programmer's Guide, available from |
| 238 | <http://www.tldp.org/guides.html>. |
| 239 | |
Eric W. Biederman | a5494dc | 2007-02-14 00:34:06 -0800 | [diff] [blame] | 240 | config SYSVIPC_SYSCTL |
| 241 | bool |
| 242 | depends on SYSVIPC |
| 243 | depends on SYSCTL |
| 244 | default y |
| 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | config POSIX_MQUEUE |
| 247 | bool "POSIX Message Queues" |
| 248 | depends on NET && EXPERIMENTAL |
| 249 | ---help--- |
| 250 | POSIX variant of message queues is a part of IPC. In POSIX message |
| 251 | queues every message has a priority which decides about succession |
| 252 | of receiving it by a process. If you want to compile and run |
| 253 | programs written e.g. for Solaris with use of its POSIX message |
Robert P. J. Day | b0e37650 | 2007-05-09 07:25:13 +0200 | [diff] [blame] | 254 | queues (functions mq_*) say Y here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
| 256 | POSIX message queues are visible as a filesystem called 'mqueue' |
| 257 | and can be mounted somewhere if you want to do filesystem |
| 258 | operations on message queues. |
| 259 | |
| 260 | If unsure, say Y. |
| 261 | |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 262 | config POSIX_MQUEUE_SYSCTL |
| 263 | bool |
| 264 | depends on POSIX_MQUEUE |
| 265 | depends on SYSCTL |
| 266 | default y |
| 267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | config BSD_PROCESS_ACCT |
| 269 | bool "BSD Process Accounting" |
| 270 | help |
| 271 | If you say Y here, a user level program will be able to instruct the |
| 272 | kernel (via a special system call) to write process accounting |
| 273 | information to a file: whenever a process exits, information about |
| 274 | that process will be appended to the file by the kernel. The |
| 275 | information includes things such as creation time, owning user, |
| 276 | command name, memory usage, controlling terminal etc. (the complete |
| 277 | list is in the struct acct in <file:include/linux/acct.h>). It is |
| 278 | up to the user level program to do useful things with this |
| 279 | information. This is generally a good idea, so say Y. |
| 280 | |
| 281 | config BSD_PROCESS_ACCT_V3 |
| 282 | bool "BSD Process Accounting version 3 file format" |
| 283 | depends on BSD_PROCESS_ACCT |
| 284 | default n |
| 285 | help |
| 286 | If you say Y here, the process accounting information is written |
| 287 | in a new file format that also logs the process IDs of each |
| 288 | process and it's parent. Note that this file format is incompatible |
| 289 | with previous v0/v1/v2 file formats, so you will need updated tools |
| 290 | for processing it. A preliminary version of these tools is available |
S.Çağlar Onur | 37a4c94 | 2008-06-18 11:45:13 +0300 | [diff] [blame] | 291 | at <http://www.gnu.org/software/acct/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Aneesh Kumar K.V | 990d6c2 | 2011-01-29 18:43:26 +0530 | [diff] [blame] | 293 | config FHANDLE |
| 294 | bool "open by fhandle syscalls" |
| 295 | select EXPORTFS |
| 296 | help |
| 297 | If you say Y here, a user level program will be able to map |
| 298 | file names to handle and then later use the handle for |
| 299 | different file system operations. This is useful in implementing |
| 300 | userspace file servers, which now track files using handles instead |
| 301 | of names. The handle would remain the same even if file names |
| 302 | get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2) |
| 303 | syscalls. |
| 304 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 305 | config TASKSTATS |
| 306 | bool "Export task/process statistics through netlink (EXPERIMENTAL)" |
| 307 | depends on NET |
| 308 | default n |
| 309 | help |
| 310 | Export selected statistics for tasks/processes through the |
| 311 | generic netlink interface. Unlike BSD process accounting, the |
| 312 | statistics are available during the lifetime of tasks/processes as |
| 313 | responses to commands. Like BSD accounting, they are sent to user |
| 314 | space on task exit. |
| 315 | |
| 316 | Say N if unsure. |
| 317 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 318 | config TASK_DELAY_ACCT |
| 319 | bool "Enable per-task delay accounting (EXPERIMENTAL)" |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 320 | depends on TASKSTATS |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 321 | help |
| 322 | Collect information on time spent by a task waiting for system |
| 323 | resources like cpu, synchronous block I/O completion and swapping |
| 324 | in pages. Such statistics can help in setting a task's priorities |
| 325 | relative to other tasks for cpu, io, rss limits etc. |
| 326 | |
| 327 | Say N if unsure. |
| 328 | |
Alexey Dobriyan | 18f705f | 2007-02-10 01:46:44 -0800 | [diff] [blame] | 329 | config TASK_XACCT |
| 330 | bool "Enable extended accounting over taskstats (EXPERIMENTAL)" |
| 331 | depends on TASKSTATS |
| 332 | help |
| 333 | Collect extended task accounting data and send the data |
| 334 | to userland for processing over the taskstats interface. |
| 335 | |
| 336 | Say N if unsure. |
| 337 | |
| 338 | config TASK_IO_ACCOUNTING |
| 339 | bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" |
| 340 | depends on TASK_XACCT |
| 341 | help |
| 342 | Collect information on the number of bytes of storage I/O which this |
| 343 | task has caused. |
| 344 | |
| 345 | Say N if unsure. |
| 346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | config AUDIT |
| 348 | bool "Auditing support" |
Chris Wright | 804a6a49 | 2005-05-11 10:52:45 +0100 | [diff] [blame] | 349 | depends on NET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | help |
| 351 | Enable auditing infrastructure that can be used with another |
| 352 | kernel subsystem, such as SELinux (which requires this for |
| 353 | logging of avc messages output). Does not do system-call |
| 354 | auditing without CONFIG_AUDITSYSCALL. |
| 355 | |
| 356 | config AUDITSYSCALL |
| 357 | bool "Enable system-call auditing support" |
Nathaniel Husted | 29ef73b | 2012-01-03 14:23:09 -0500 | [diff] [blame] | 358 | depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || ARM) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | default y if SECURITY_SELINUX |
| 360 | help |
| 361 | Enable low-overhead system-call auditing infrastructure that |
| 362 | can be used independently or with another kernel subsystem, |
Eric Paris | 67640b6 | 2009-12-17 20:12:06 -0500 | [diff] [blame] | 363 | such as SELinux. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
Eric Paris | 939a67f | 2009-12-17 20:12:06 -0500 | [diff] [blame] | 365 | config AUDIT_WATCH |
| 366 | def_bool y |
| 367 | depends on AUDITSYSCALL |
| 368 | select FSNOTIFY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 370 | config AUDIT_TREE |
| 371 | def_bool y |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 372 | depends on AUDITSYSCALL |
Eric Paris | 28a3a7e | 2009-12-17 20:12:05 -0500 | [diff] [blame] | 373 | select FSNOTIFY |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 374 | |
Eric Paris | 633b454 | 2012-01-03 14:23:08 -0500 | [diff] [blame] | 375 | config AUDIT_LOGINUID_IMMUTABLE |
| 376 | bool "Make audit loginuid immutable" |
| 377 | depends on AUDIT |
| 378 | help |
Linus Torvalds | f429ee3 | 2012-01-17 16:06:51 -0800 | [diff] [blame] | 379 | The config option toggles if a task setting its loginuid requires |
Eric Paris | 633b454 | 2012-01-03 14:23:08 -0500 | [diff] [blame] | 380 | CAP_SYS_AUDITCONTROL or if that task should require no special permissions |
| 381 | but should instead only allow setting its loginuid if it was never |
| 382 | previously set. On systems which use systemd or a similar central |
| 383 | process to restart login services this should be set to true. On older |
| 384 | systems in which an admin would typically have to directly stop and |
| 385 | start processes this should be set to false. Setting this to true allows |
| 386 | one to drop potentially dangerous capabilites from the login tasks, |
| 387 | but may not be backwards compatible with older init systems. |
| 388 | |
Thomas Gleixner | d9817eb | 2010-09-27 12:45:59 +0000 | [diff] [blame] | 389 | source "kernel/irq/Kconfig" |
| 390 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 391 | menu "RCU Subsystem" |
| 392 | |
| 393 | choice |
| 394 | prompt "RCU Implementation" |
Paul E. McKenney | 31c9a24 | 2009-04-02 21:06:25 -0700 | [diff] [blame] | 395 | default TREE_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 396 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 397 | config TREE_RCU |
| 398 | bool "Tree-based hierarchical RCU" |
Paul E. McKenney | 687d7a9 | 2010-07-21 06:52:40 -0700 | [diff] [blame] | 399 | depends on !PREEMPT && SMP |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 400 | help |
| 401 | This option selects the RCU implementation that is |
| 402 | designed for very large SMP system with hundreds or |
Paul E. McKenney | c17ef45 | 2009-06-23 17:12:47 -0700 | [diff] [blame] | 403 | thousands of CPUs. It also scales down nicely to |
| 404 | smaller systems. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 405 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 406 | config TREE_PREEMPT_RCU |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 407 | bool "Preemptible tree-based hierarchical RCU" |
Paul E. McKenney | 8008e12 | 2011-06-08 16:31:33 -0700 | [diff] [blame] | 408 | depends on PREEMPT && SMP |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 409 | help |
| 410 | This option selects the RCU implementation that is |
| 411 | designed for very large SMP systems with hundreds or |
| 412 | thousands of CPUs, but for which real-time response |
Paul E. McKenney | bbe3eae | 2009-09-13 09:15:08 -0700 | [diff] [blame] | 413 | is also required. It also scales down nicely to |
| 414 | smaller systems. |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 415 | |
Paul E. McKenney | 9b1d82f | 2009-10-25 19:03:50 -0700 | [diff] [blame] | 416 | config TINY_RCU |
| 417 | bool "UP-only small-memory-footprint RCU" |
Paul E. McKenney | 8008e12 | 2011-06-08 16:31:33 -0700 | [diff] [blame] | 418 | depends on !PREEMPT && !SMP |
Paul E. McKenney | 9b1d82f | 2009-10-25 19:03:50 -0700 | [diff] [blame] | 419 | help |
| 420 | This option selects the RCU implementation that is |
| 421 | designed for UP systems from which real-time response |
| 422 | is not required. This option greatly reduces the |
| 423 | memory footprint of RCU. |
| 424 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 425 | config TINY_PREEMPT_RCU |
| 426 | bool "Preemptible UP-only small-memory-footprint RCU" |
Paul E. McKenney | 8008e12 | 2011-06-08 16:31:33 -0700 | [diff] [blame] | 427 | depends on PREEMPT && !SMP |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 428 | help |
| 429 | This option selects the RCU implementation that is designed |
| 430 | for real-time UP systems. This option greatly reduces the |
| 431 | memory footprint of RCU. |
| 432 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 433 | endchoice |
| 434 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 435 | config PREEMPT_RCU |
| 436 | def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU ) |
| 437 | help |
| 438 | This option enables preemptible-RCU code that is common between |
| 439 | the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations. |
| 440 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 441 | config RCU_TRACE |
| 442 | bool "Enable tracing for RCU" |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 443 | help |
| 444 | This option provides tracing in RCU which presents stats |
| 445 | in debugfs for debugging RCU implementation. |
| 446 | |
| 447 | Say Y here if you want to enable RCU tracing |
| 448 | Say N if you are unsure. |
| 449 | |
| 450 | config RCU_FANOUT |
| 451 | int "Tree-based hierarchical RCU fanout value" |
| 452 | range 2 64 if 64BIT |
| 453 | range 2 32 if !64BIT |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 454 | depends on TREE_RCU || TREE_PREEMPT_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 455 | default 64 if 64BIT |
| 456 | default 32 if !64BIT |
| 457 | help |
| 458 | This option controls the fanout of hierarchical implementations |
| 459 | of RCU, allowing RCU to work efficiently on machines with |
Paul E. McKenney | 4d87ffa | 2010-08-04 17:31:12 -0700 | [diff] [blame] | 460 | large numbers of CPUs. This value must be at least the fourth |
| 461 | root of NR_CPUS, which allows NR_CPUS to be insanely large. |
| 462 | The default value of RCU_FANOUT should be used for production |
| 463 | systems, but if you are stress-testing the RCU implementation |
| 464 | itself, small RCU_FANOUT values allow you to test large-system |
| 465 | code paths on small(er) systems. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 466 | |
| 467 | Select a specific number if testing RCU itself. |
| 468 | Take the default if unsure. |
| 469 | |
| 470 | config RCU_FANOUT_EXACT |
| 471 | bool "Disable tree-based hierarchical RCU auto-balancing" |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 472 | depends on TREE_RCU || TREE_PREEMPT_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 473 | default n |
| 474 | help |
| 475 | This option forces use of the exact RCU_FANOUT value specified, |
| 476 | regardless of imbalances in the hierarchy. This is useful for |
| 477 | testing RCU itself, and might one day be useful on systems with |
| 478 | strong NUMA behavior. |
| 479 | |
| 480 | Without RCU_FANOUT_EXACT, the code will balance the hierarchy. |
| 481 | |
| 482 | Say N if unsure. |
| 483 | |
Paul E. McKenney | 8bd93a2 | 2010-02-22 17:04:59 -0800 | [diff] [blame] | 484 | config RCU_FAST_NO_HZ |
| 485 | bool "Accelerate last non-dyntick-idle CPU's grace periods" |
Paul E. McKenney | b807fbf | 2011-11-03 14:56:12 -0700 | [diff] [blame] | 486 | depends on NO_HZ && SMP |
Paul E. McKenney | 8bd93a2 | 2010-02-22 17:04:59 -0800 | [diff] [blame] | 487 | default n |
| 488 | help |
| 489 | This option causes RCU to attempt to accelerate grace periods |
Paul E. McKenney | b807fbf | 2011-11-03 14:56:12 -0700 | [diff] [blame] | 490 | in order to allow CPUs to enter dynticks-idle state more |
| 491 | quickly. On the other hand, this option increases the overhead |
| 492 | of the dynticks-idle checking, particularly on systems with |
| 493 | large numbers of CPUs. |
Paul E. McKenney | 8bd93a2 | 2010-02-22 17:04:59 -0800 | [diff] [blame] | 494 | |
| 495 | Say Y if energy efficiency is critically important, particularly |
| 496 | if you have relatively few CPUs. |
| 497 | |
| 498 | Say N if you are unsure. |
| 499 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 500 | config TREE_RCU_TRACE |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 501 | def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 502 | select DEBUG_FS |
| 503 | help |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 504 | This option provides tracing for the TREE_RCU and |
| 505 | TREE_PREEMPT_RCU implementations, permitting Makefile to |
| 506 | trivially select kernel/rcutree_trace.c. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 507 | |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 508 | config RCU_BOOST |
| 509 | bool "Enable RCU priority boosting" |
Paul E. McKenney | 27f4d28 | 2011-02-07 12:47:15 -0800 | [diff] [blame] | 510 | depends on RT_MUTEXES && PREEMPT_RCU |
Paul E. McKenney | 24278d1 | 2010-09-27 17:25:23 -0700 | [diff] [blame] | 511 | default n |
| 512 | help |
| 513 | This option boosts the priority of preempted RCU readers that |
| 514 | block the current preemptible RCU grace period for too long. |
| 515 | This option also prevents heavy loads from blocking RCU |
| 516 | callback invocation for all flavors of RCU. |
| 517 | |
| 518 | Say Y here if you are working with real-time apps or heavy loads |
| 519 | Say N here if you are unsure. |
| 520 | |
| 521 | config RCU_BOOST_PRIO |
| 522 | int "Real-time priority to boost RCU readers to" |
| 523 | range 1 99 |
| 524 | depends on RCU_BOOST |
| 525 | default 1 |
| 526 | help |
| 527 | This option specifies the real-time priority to which preempted |
| 528 | RCU readers are to be boosted. If you are working with CPU-bound |
| 529 | real-time applications, you should specify a priority higher then |
| 530 | the highest-priority CPU-bound application. |
| 531 | |
| 532 | Specify the real-time priority, or take the default if unsure. |
| 533 | |
| 534 | config RCU_BOOST_DELAY |
| 535 | int "Milliseconds to delay boosting after RCU grace-period start" |
| 536 | range 0 3000 |
| 537 | depends on RCU_BOOST |
| 538 | default 500 |
| 539 | help |
| 540 | This option specifies the time to wait after the beginning of |
| 541 | a given grace period before priority-boosting preempted RCU |
| 542 | readers blocking that grace period. Note that any RCU reader |
| 543 | blocking an expedited RCU grace period is boosted immediately. |
| 544 | |
| 545 | Accept the default if unsure. |
| 546 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 547 | endmenu # "RCU Subsystem" |
| 548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | config IKCONFIG |
Ross Biro | f2443ab | 2006-09-30 23:27:25 -0700 | [diff] [blame] | 550 | tristate "Kernel .config support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | ---help--- |
| 552 | This option enables the complete Linux kernel ".config" file |
| 553 | contents to be saved in the kernel. It provides documentation |
| 554 | of which kernel options are used in a running kernel or in an |
| 555 | on-disk kernel. This information can be extracted from the kernel |
| 556 | image file with the script scripts/extract-ikconfig and used as |
| 557 | input to rebuild the current kernel or to build another kernel. |
| 558 | It can also be extracted from a running kernel by reading |
| 559 | /proc/config.gz if enabled (below). |
| 560 | |
| 561 | config IKCONFIG_PROC |
| 562 | bool "Enable access to .config through /proc/config.gz" |
| 563 | depends on IKCONFIG && PROC_FS |
| 564 | ---help--- |
| 565 | This option enables access to the kernel configuration file |
| 566 | through /proc/config.gz. |
| 567 | |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 568 | config LOG_BUF_SHIFT |
| 569 | int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" |
| 570 | range 12 21 |
Adrian Bunk | f17a32e | 2008-04-29 00:58:58 -0700 | [diff] [blame] | 571 | default 17 |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 572 | help |
| 573 | Select kernel log buffer size as a power of 2. |
Adrian Bunk | f17a32e | 2008-04-29 00:58:58 -0700 | [diff] [blame] | 574 | Examples: |
| 575 | 17 => 128 KB |
| 576 | 16 => 64 KB |
| 577 | 15 => 32 KB |
| 578 | 14 => 16 KB |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 579 | 13 => 8 KB |
| 580 | 12 => 4 KB |
| 581 | |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 582 | # |
| 583 | # Architectures with an unreliable sched_clock() should select this: |
| 584 | # |
| 585 | config HAVE_UNSTABLE_SCHED_CLOCK |
| 586 | bool |
| 587 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 588 | menuconfig CGROUPS |
| 589 | boolean "Control Group support" |
Kirill A. Shutemov | 0dea116 | 2010-03-10 15:22:20 -0800 | [diff] [blame] | 590 | depends on EVENTFD |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 591 | help |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 592 | This option adds support for grouping sets of processes together, for |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 593 | use with process control subsystems such as Cpusets, CFS, memory |
| 594 | controls or device isolation. |
| 595 | See |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 596 | - Documentation/scheduler/sched-design-CFS.txt (CFS) |
Li Zefan | 45ce80f | 2009-01-15 13:50:59 -0800 | [diff] [blame] | 597 | - Documentation/cgroups/ (features for grouping, isolation |
| 598 | and resource control) |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 599 | |
| 600 | Say N if unsure. |
| 601 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 602 | if CGROUPS |
| 603 | |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 604 | config CGROUP_DEBUG |
| 605 | bool "Example debug cgroup subsystem" |
Paul Menage | 418d7d8 | 2008-04-29 01:00:05 -0700 | [diff] [blame] | 606 | default n |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 607 | help |
| 608 | This option enables a simple cgroup subsystem that |
| 609 | exports useful debugging information about the cgroups |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 610 | framework. |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 611 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 612 | Say N if unsure. |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 613 | |
Matt Helsley | dc52ddc | 2008-10-18 20:27:21 -0700 | [diff] [blame] | 614 | config CGROUP_FREEZER |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 615 | bool "Freezer cgroup subsystem" |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 616 | help |
| 617 | Provides a way to freeze and unfreeze all tasks in a |
Matt Helsley | dc52ddc | 2008-10-18 20:27:21 -0700 | [diff] [blame] | 618 | cgroup. |
| 619 | |
Serge E. Hallyn | 08ce5f1 | 2008-04-29 01:00:10 -0700 | [diff] [blame] | 620 | config CGROUP_DEVICE |
| 621 | bool "Device controller for cgroups" |
Serge E. Hallyn | 08ce5f1 | 2008-04-29 01:00:10 -0700 | [diff] [blame] | 622 | help |
| 623 | Provides a cgroup implementing whitelists for devices which |
| 624 | a process in the cgroup can mknod or open. |
| 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | config CPUSETS |
| 627 | bool "Cpuset support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | help |
Randy Dunlap | d9fd8a6 | 2005-07-27 11:45:11 -0700 | [diff] [blame] | 629 | This option will let you create and manage CPUSETs which |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | allow dynamically partitioning a system into sets of CPUs and |
| 631 | Memory Nodes and assigning tasks to run only within those sets. |
| 632 | This is primarily useful on large SMP or NUMA systems. |
| 633 | |
| 634 | Say N if unsure. |
| 635 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 636 | config PROC_PID_CPUSET |
| 637 | bool "Include legacy /proc/<pid>/cpuset file" |
| 638 | depends on CPUSETS |
| 639 | default y |
| 640 | |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 641 | config CGROUP_CPUACCT |
| 642 | bool "Simple CPU accounting cgroup subsystem" |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 643 | help |
| 644 | Provides a simple Resource Controller for monitoring the |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 645 | total CPU consumed by the tasks in a cgroup. |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 646 | |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 647 | config RESOURCE_COUNTERS |
| 648 | bool "Resource counters" |
| 649 | help |
| 650 | This option enables controller independent resource accounting |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 651 | infrastructure that works with cgroups. |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 652 | |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 653 | config CGROUP_MEM_RES_CTLR |
| 654 | bool "Memory Resource Controller for Control Groups" |
Daniel Lezcano | 79ae9c2 | 2010-10-27 15:34:39 -0700 | [diff] [blame] | 655 | depends on RESOURCE_COUNTERS |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 656 | select MM_OWNER |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 657 | help |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 658 | Provides a memory resource controller that manages both anonymous |
Thadeu Lima de Souza Cascardo | 21acb9c | 2009-02-04 10:12:08 +0100 | [diff] [blame] | 659 | memory and page cache. (See Documentation/cgroups/memory.txt) |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 660 | |
| 661 | Note that setting this option increases fixed memory overhead |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 662 | associated with each page of memory in the system. By this, |
| 663 | 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory |
| 664 | usage tracking struct at boot. Total amount of this is printed out |
| 665 | at boot. |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 666 | |
| 667 | Only enable when you're ok with these trade offs and really |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 668 | sure you need the memory resource controller. Even when you enable |
| 669 | this, you can set "cgroup_disable=memory" at your boot option to |
| 670 | disable memory resource controller and you can avoid overheads. |
Li Zefan | c9d5409 | 2009-01-07 18:07:35 -0800 | [diff] [blame] | 671 | (and lose benefits of memory resource controller) |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 672 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 673 | This config option also selects MM_OWNER config option, which |
| 674 | could in turn add some fork/exit overhead. |
| 675 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 676 | config CGROUP_MEM_RES_CTLR_SWAP |
KAMEZAWA Hiroyuki | 65e0e81 | 2010-08-10 18:02:56 -0700 | [diff] [blame] | 677 | bool "Memory Resource Controller Swap Extension" |
| 678 | depends on CGROUP_MEM_RES_CTLR && SWAP |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 679 | help |
| 680 | Add swap management feature to memory resource controller. When you |
| 681 | enable this, you can limit mem+swap usage per cgroup. In other words, |
| 682 | when you disable this, memory resource controller has no cares to |
| 683 | usage of swap...a process can exhaust all of the swap. This extension |
| 684 | is useful when you want to avoid exhaustion swap but this itself |
| 685 | adds more overheads and consumes memory for remembering information. |
| 686 | Especially if you use 32bit system or small memory system, please |
| 687 | be careful about enabling this. When memory resource controller |
| 688 | is disabled by boot option, this will be automatically disabled and |
| 689 | there will be no overhead from this. Even when you set this config=y, |
WANG Cong | 00a66d2 | 2011-07-25 17:12:12 -0700 | [diff] [blame] | 690 | if boot option "swapaccount=0" is set, swap will not be accounted. |
KAMEZAWA Hiroyuki | 627991a | 2009-04-02 16:57:47 -0700 | [diff] [blame] | 691 | Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page |
| 692 | size is 4096bytes, 512k per 1Gbytes of swap. |
Michal Hocko | a42c390 | 2010-11-24 12:57:08 -0800 | [diff] [blame] | 693 | config CGROUP_MEM_RES_CTLR_SWAP_ENABLED |
| 694 | bool "Memory Resource Controller Swap Extension enabled by default" |
| 695 | depends on CGROUP_MEM_RES_CTLR_SWAP |
| 696 | default y |
| 697 | help |
| 698 | Memory Resource Controller Swap Extension comes with its price in |
| 699 | a bigger memory consumption. General purpose distribution kernels |
Jim Cromie | 43d547f | 2010-12-17 14:32:36 -0700 | [diff] [blame] | 700 | which want to enable the feature but keep it disabled by default |
Michal Hocko | a42c390 | 2010-11-24 12:57:08 -0800 | [diff] [blame] | 701 | and let the user enable it by swapaccount boot command line |
| 702 | parameter should have this option unselected. |
| 703 | For those who want to have the feature enabled by default should |
| 704 | select this option (if, for some reason, they need to disable it |
WANG Cong | 00a66d2 | 2011-07-25 17:12:12 -0700 | [diff] [blame] | 705 | then swapaccount=0 does the trick). |
Glauber Costa | e5671df | 2011-12-11 21:47:01 +0000 | [diff] [blame] | 706 | config CGROUP_MEM_RES_CTLR_KMEM |
| 707 | bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)" |
| 708 | depends on CGROUP_MEM_RES_CTLR && EXPERIMENTAL |
| 709 | default n |
| 710 | help |
| 711 | The Kernel Memory extension for Memory Resource Controller can limit |
| 712 | the amount of memory used by kernel objects in the system. Those are |
| 713 | fundamentally different from the entities handled by the standard |
| 714 | Memory Controller, which are page-based, and can be swapped. Users of |
| 715 | the kmem extension can use it to guarantee that no group of processes |
| 716 | will ever exhaust kernel resources alone. |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 717 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 718 | config CGROUP_PERF |
| 719 | bool "Enable perf_event per-cpu per-container group (cgroup) monitoring" |
| 720 | depends on PERF_EVENTS && CGROUPS |
| 721 | help |
| 722 | This option extends the per-cpu mode to restrict monitoring to |
Li Zefan | 2d0f252 | 2011-03-03 14:26:20 +0800 | [diff] [blame] | 723 | threads which belong to the cgroup specified and run on the |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 724 | designated cpu. |
| 725 | |
| 726 | Say N if unsure. |
| 727 | |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 728 | menuconfig CGROUP_SCHED |
| 729 | bool "Group CPU scheduler" |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 730 | default n |
| 731 | help |
| 732 | This feature lets CPU scheduler recognize task groups and control CPU |
| 733 | bandwidth allocation to such task groups. It uses cgroups to group |
| 734 | tasks. |
| 735 | |
| 736 | if CGROUP_SCHED |
| 737 | config FAIR_GROUP_SCHED |
| 738 | bool "Group scheduling for SCHED_OTHER" |
| 739 | depends on CGROUP_SCHED |
| 740 | default CGROUP_SCHED |
| 741 | |
Paul Turner | ab84d31 | 2011-07-21 09:43:28 -0700 | [diff] [blame] | 742 | config CFS_BANDWIDTH |
| 743 | bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED" |
| 744 | depends on EXPERIMENTAL |
| 745 | depends on FAIR_GROUP_SCHED |
| 746 | default n |
| 747 | help |
| 748 | This option allows users to define CPU bandwidth rates (limits) for |
| 749 | tasks running within the fair group scheduler. Groups with no limit |
| 750 | set are considered to be unconstrained and will run with no |
| 751 | restriction. |
| 752 | See tip/Documentation/scheduler/sched-bwc.txt for more information. |
| 753 | |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 754 | config RT_GROUP_SCHED |
| 755 | bool "Group scheduling for SCHED_RR/FIFO" |
| 756 | depends on EXPERIMENTAL |
| 757 | depends on CGROUP_SCHED |
| 758 | default n |
| 759 | help |
| 760 | This feature lets you explicitly allocate real CPU bandwidth |
Li Zefan | 32bd7eb | 2010-03-24 13:17:19 +0800 | [diff] [blame] | 761 | to task groups. If enabled, it will also make it impossible to |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 762 | schedule realtime tasks for non-root users until you allocate |
| 763 | realtime bandwidth for them. |
| 764 | See Documentation/scheduler/sched-rt-group.txt for more information. |
| 765 | |
| 766 | endif #CGROUP_SCHED |
| 767 | |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 768 | config BLK_CGROUP |
| 769 | tristate "Block IO controller" |
Daniel Lezcano | 79ae9c2 | 2010-10-27 15:34:39 -0700 | [diff] [blame] | 770 | depends on BLOCK |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 771 | default n |
| 772 | ---help--- |
| 773 | Generic block IO controller cgroup interface. This is the common |
| 774 | cgroup interface which should be used by various IO controlling |
| 775 | policies. |
| 776 | |
| 777 | Currently, CFQ IO scheduler uses it to recognize task groups and |
| 778 | control disk bandwidth allocation (proportional time slice allocation) |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 779 | to such task groups. It is also used by bio throttling logic in |
| 780 | block layer to implement upper limit in IO rates on a device. |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 781 | |
| 782 | This option only enables generic Block IO controller infrastructure. |
Vivek Goyal | e43473b | 2010-09-15 17:06:35 -0400 | [diff] [blame] | 783 | One needs to also enable actual IO controlling logic/policy. For |
Michael Witten | 79e2e75 | 2011-01-16 21:43:10 +0000 | [diff] [blame] | 784 | enabling proportional weight division of disk bandwidth in CFQ, set |
| 785 | CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set |
Michael Witten | c5e0591 | 2011-01-17 00:08:41 +0000 | [diff] [blame] | 786 | CONFIG_BLK_DEV_THROTTLING=y. |
Vivek Goyal | afc24d4 | 2010-04-26 19:27:56 +0200 | [diff] [blame] | 787 | |
| 788 | See Documentation/cgroups/blkio-controller.txt for more information. |
| 789 | |
| 790 | config DEBUG_BLK_CGROUP |
| 791 | bool "Enable Block IO controller debugging" |
| 792 | depends on BLK_CGROUP |
| 793 | default n |
| 794 | ---help--- |
| 795 | Enable some debugging help. Currently it exports additional stat |
| 796 | files in a cgroup which can be useful for debugging. |
| 797 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 798 | endif # CGROUPS |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 799 | |
Cyrill Gorcunov | 067bce1 | 2012-01-12 17:20:49 -0800 | [diff] [blame] | 800 | config CHECKPOINT_RESTORE |
| 801 | bool "Checkpoint/restore support" if EXPERT |
| 802 | default n |
| 803 | help |
| 804 | Enables additional kernel features in a sake of checkpoint/restore. |
| 805 | In particular it adds auxiliary prctl codes to setup process text, |
| 806 | data and heap segment sizes, and a few additional /proc filesystem |
| 807 | entries. |
| 808 | |
| 809 | If unsure, say N here. |
| 810 | |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 811 | menuconfig NAMESPACES |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 812 | bool "Namespaces support" if EXPERT |
| 813 | default !EXPERT |
Pavel Emelyanov | c5289a6 | 2008-02-08 04:18:19 -0800 | [diff] [blame] | 814 | help |
| 815 | Provides the way to make tasks work with different objects using |
| 816 | the same id. For example same IPC id may refer to different objects |
| 817 | or same user id or pid may refer to different tasks when used in |
| 818 | different namespaces. |
| 819 | |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 820 | if NAMESPACES |
| 821 | |
Pavel Emelyanov | 58bfdd6d | 2008-02-08 04:18:21 -0800 | [diff] [blame] | 822 | config UTS_NS |
| 823 | bool "UTS namespace" |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 824 | default y |
Pavel Emelyanov | 58bfdd6d | 2008-02-08 04:18:21 -0800 | [diff] [blame] | 825 | help |
| 826 | In this namespace tasks see different info provided with the |
| 827 | uname() system call |
| 828 | |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 829 | config IPC_NS |
| 830 | bool "IPC namespace" |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 831 | depends on (SYSVIPC || POSIX_MQUEUE) |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 832 | default y |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 833 | help |
| 834 | In this namespace tasks work with IPC ids which correspond to |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 835 | different IPC objects in different namespaces. |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 836 | |
Pavel Emelyanov | aee16ce | 2008-02-08 04:18:23 -0800 | [diff] [blame] | 837 | config USER_NS |
| 838 | bool "User namespace (EXPERIMENTAL)" |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 839 | depends on EXPERIMENTAL |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 840 | default y |
Pavel Emelyanov | aee16ce | 2008-02-08 04:18:23 -0800 | [diff] [blame] | 841 | help |
| 842 | This allows containers, i.e. vservers, to use user namespaces |
| 843 | to provide different user info for different servers. |
| 844 | If unsure, say N. |
| 845 | |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 846 | config PID_NS |
Daniel Lezcano | 9bd38c2 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 847 | bool "PID Namespaces" |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 848 | default y |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 849 | help |
Heikki Orsila | 12d2b8f | 2008-07-06 15:48:02 +0300 | [diff] [blame] | 850 | Support process id namespaces. This allows having multiple |
Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 851 | processes with the same pid as long as they are in different |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 852 | pid namespaces. This is a building block of containers. |
| 853 | |
Matt Helsley | d6eb633 | 2009-01-26 12:25:55 -0800 | [diff] [blame] | 854 | config NET_NS |
| 855 | bool "Network namespace" |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 856 | depends on NET |
Daniel Lezcano | 17a6d44 | 2010-10-27 15:34:37 -0700 | [diff] [blame] | 857 | default y |
Matt Helsley | d6eb633 | 2009-01-26 12:25:55 -0800 | [diff] [blame] | 858 | help |
| 859 | Allow user space to create what appear to be multiple instances |
| 860 | of the network stack. |
| 861 | |
Daniel Lezcano | 8dd2a82 | 2010-10-27 15:34:38 -0700 | [diff] [blame] | 862 | endif # NAMESPACES |
| 863 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 864 | config SCHED_AUTOGROUP |
| 865 | bool "Automatic process group scheduling" |
| 866 | select EVENTFD |
| 867 | select CGROUPS |
| 868 | select CGROUP_SCHED |
| 869 | select FAIR_GROUP_SCHED |
| 870 | help |
| 871 | This option optimizes the scheduler for common desktop workloads by |
| 872 | automatically creating and populating task groups. This separation |
| 873 | of workloads isolates aggressive CPU burners (like build jobs) from |
| 874 | desktop applications. Task group autogeneration is currently based |
| 875 | upon task session. |
| 876 | |
Daniel Lezcano | 7af37be | 2010-10-27 15:34:41 -0700 | [diff] [blame] | 877 | config MM_OWNER |
| 878 | bool |
| 879 | |
| 880 | config SYSFS_DEPRECATED |
Ferenc Wagner | 5d6a4ea | 2011-01-10 19:04:22 +0100 | [diff] [blame] | 881 | bool "Enable deprecated sysfs features to support old userspace tools" |
Daniel Lezcano | 7af37be | 2010-10-27 15:34:41 -0700 | [diff] [blame] | 882 | depends on SYSFS |
| 883 | default n |
| 884 | help |
| 885 | This option adds code that switches the layout of the "block" class |
| 886 | devices, to not show up in /sys/class/block/, but only in |
| 887 | /sys/block/. |
| 888 | |
| 889 | This switch is only active when the sysfs.deprecated=1 boot option is |
| 890 | passed or the SYSFS_DEPRECATED_V2 option is set. |
| 891 | |
| 892 | This option allows new kernels to run on old distributions and tools, |
| 893 | which might get confused by /sys/class/block/. Since 2007/2008 all |
| 894 | major distributions and tools handle this just fine. |
| 895 | |
| 896 | Recent distributions and userspace tools after 2009/2010 depend on |
| 897 | the existence of /sys/class/block/, and will not work with this |
| 898 | option enabled. |
| 899 | |
| 900 | Only if you are using a new kernel on an old distribution, you might |
| 901 | need to say Y here. |
| 902 | |
| 903 | config SYSFS_DEPRECATED_V2 |
Ferenc Wagner | 5d6a4ea | 2011-01-10 19:04:22 +0100 | [diff] [blame] | 904 | bool "Enable deprecated sysfs features by default" |
Daniel Lezcano | 7af37be | 2010-10-27 15:34:41 -0700 | [diff] [blame] | 905 | default n |
| 906 | depends on SYSFS |
| 907 | depends on SYSFS_DEPRECATED |
| 908 | help |
| 909 | Enable deprecated sysfs by default. |
| 910 | |
| 911 | See the CONFIG_SYSFS_DEPRECATED option for more details about this |
| 912 | option. |
| 913 | |
| 914 | Only if you are using a new kernel on an old distribution, you might |
| 915 | need to say Y here. Even then, odds are you would not need it |
| 916 | enabled, you can always pass the boot option if absolutely necessary. |
| 917 | |
| 918 | config RELAY |
| 919 | bool "Kernel->user space relay support (formerly relayfs)" |
| 920 | help |
| 921 | This option enables support for relay interface support in |
| 922 | certain file systems (such as debugfs). |
| 923 | It is designed to provide an efficient mechanism for tools and |
| 924 | facilities to relay large amounts of data from kernel space to |
| 925 | user space. |
| 926 | |
| 927 | If unsure, say N. |
| 928 | |
Dimitri Gorokhovik | f991633 | 2007-03-06 01:42:17 -0800 | [diff] [blame] | 929 | config BLK_DEV_INITRD |
| 930 | bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" |
| 931 | depends on BROKEN || !FRV |
| 932 | help |
| 933 | The initial RAM filesystem is a ramfs which is loaded by the |
| 934 | boot loader (loadlin or lilo) and that is mounted as root |
| 935 | before the normal boot procedure. It is typically used to |
| 936 | load modules needed to mount the "real" root file system, |
| 937 | etc. See <file:Documentation/initrd.txt> for details. |
| 938 | |
| 939 | If RAM disk support (BLK_DEV_RAM) is also included, this |
| 940 | also enables initial RAM disk (initrd) support and adds |
| 941 | 15 Kbytes (more on some other architectures) to the kernel size. |
| 942 | |
| 943 | If unsure say Y. |
| 944 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 945 | if BLK_DEV_INITRD |
| 946 | |
Sam Ravnborg | dbec486 | 2005-08-10 20:44:50 +0200 | [diff] [blame] | 947 | source "usr/Kconfig" |
| 948 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 949 | endif |
| 950 | |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 951 | config CC_OPTIMIZE_FOR_SIZE |
Ingo Molnar | 96fffeb | 2008-04-28 01:39:43 +0200 | [diff] [blame] | 952 | bool "Optimize for size" |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 953 | help |
| 954 | Enabling this option will pass "-Os" instead of "-O2" to gcc |
| 955 | resulting in a smaller kernel. |
| 956 | |
jkacur | 775a722 | 2008-07-16 00:31:16 +0200 | [diff] [blame] | 957 | If unsure, say Y. |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 958 | |
Randy Dunlap | 0847062 | 2006-09-30 23:28:13 -0700 | [diff] [blame] | 959 | config SYSCTL |
| 960 | bool |
| 961 | |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 962 | config ANON_INODES |
| 963 | bool |
| 964 | |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 965 | menuconfig EXPERT |
| 966 | bool "Configure standard kernel features (expert users)" |
Josh Triplett | f505c55 | 2011-06-05 18:23:58 -0700 | [diff] [blame] | 967 | # Unhide debug options, to make the on-by-default options visible |
| 968 | select DEBUG_KERNEL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | help |
| 970 | This option allows certain base kernel options and settings |
| 971 | to be disabled or tweaked. This is for specialized |
| 972 | environments which can tolerate a "non-standard" kernel. |
| 973 | Only use this if you really know what you are doing. |
| 974 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 975 | config UID16 |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 976 | bool "Enable 16-bit UID system calls" if EXPERT |
David S. Miller | 09337f5 | 2008-04-26 03:17:12 -0700 | [diff] [blame] | 977 | 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] | 978 | default y |
| 979 | help |
| 980 | This enables the legacy 16-bit UID syscall wrappers. |
| 981 | |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 982 | config SYSCTL_SYSCALL |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 983 | bool "Sysctl syscall support" if EXPERT |
Eric W. Biederman | 26a7034 | 2009-11-05 05:26:41 -0800 | [diff] [blame] | 984 | depends on PROC_SYSCTL |
WANG Cong | c736de6 | 2011-11-02 13:39:25 -0700 | [diff] [blame] | 985 | default n |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 986 | select SYSCTL |
| 987 | ---help--- |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 988 | sys_sysctl uses binary paths that have been found challenging |
| 989 | to properly maintain and use. The interface in /proc/sys |
| 990 | using paths with ascii names is now the primary path to this |
| 991 | information. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 992 | |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 993 | Almost nothing using the binary sysctl interface so if you are |
| 994 | trying to save some space it is probably safe to disable this, |
| 995 | making your kernel marginally smaller. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 996 | |
WANG Cong | c736de6 | 2011-11-02 13:39:25 -0700 | [diff] [blame] | 997 | If unsure say N here. |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 998 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | config KALLSYMS |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1000 | bool "Load all symbols for debugging/ksymoops" if EXPERT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | default y |
| 1002 | help |
| 1003 | Say Y here to let the kernel print out symbolic crash information and |
| 1004 | symbolic stack backtraces. This increases the size of the kernel |
| 1005 | somewhat, as all symbols have to be loaded into the kernel image. |
| 1006 | |
| 1007 | config KALLSYMS_ALL |
| 1008 | bool "Include all symbols in kallsyms" |
| 1009 | depends on DEBUG_KERNEL && KALLSYMS |
| 1010 | help |
Artem Bityutskiy | 71a83ec | 2011-04-05 13:24:57 +0300 | [diff] [blame] | 1011 | Normally kallsyms only contains the symbols of functions for nicer |
| 1012 | OOPS messages and backtraces (i.e., symbols from the text and inittext |
| 1013 | sections). This is sufficient for most cases. And only in very rare |
| 1014 | cases (e.g., when a debugger is used) all symbols are required (e.g., |
| 1015 | names of variables from the data sections, etc). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | |
Artem Bityutskiy | 71a83ec | 2011-04-05 13:24:57 +0300 | [diff] [blame] | 1017 | This option makes sure that all symbols are loaded into the kernel |
| 1018 | image (i.e., symbols from all sections) in cost of increased kernel |
| 1019 | size (depending on the kernel configuration, it may be 300KiB or |
| 1020 | something like this). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | |
Artem Bityutskiy | 71a83ec | 2011-04-05 13:24:57 +0300 | [diff] [blame] | 1022 | Say N unless you really need all symbols. |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 1023 | |
Greg Kroah-Hartman | 712f47c | 2005-11-16 11:27:07 -0800 | [diff] [blame] | 1024 | config HOTPLUG |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1025 | bool "Support for hot-pluggable devices" if EXPERT |
Greg Kroah-Hartman | 712f47c | 2005-11-16 11:27:07 -0800 | [diff] [blame] | 1026 | default y |
| 1027 | help |
| 1028 | This option is provided for the case where no hotplug or uevent |
| 1029 | capabilities is wanted by the kernel. You should only consider |
| 1030 | disabling this option for embedded systems that do not use modules, a |
| 1031 | dynamic /dev tree, or dynamic device discovery. Just say Y. |
| 1032 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 1033 | config PRINTK |
| 1034 | default y |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1035 | bool "Enable support for printk" if EXPERT |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 1036 | help |
| 1037 | This option enables normal printk support. Removing it |
| 1038 | eliminates most of the message strings from the kernel image |
| 1039 | and makes the kernel more or less silent. As this makes it |
| 1040 | very difficult to diagnose system problems, saying N here is |
| 1041 | strongly discouraged. |
| 1042 | |
Matt Mackall | c8538a7 | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 1043 | config BUG |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1044 | bool "BUG() support" if EXPERT |
Matt Mackall | c8538a7 | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 1045 | default y |
| 1046 | help |
| 1047 | Disabling this option eliminates support for BUG and WARN, reducing |
| 1048 | the size of your kernel image and potentially quietly ignoring |
| 1049 | numerous fatal conditions. You should only consider disabling this |
| 1050 | option for embedded systems with no facilities for reporting errors. |
| 1051 | Just say Y. |
| 1052 | |
Matt Mackall | 708e9a7 | 2006-01-08 01:05:25 -0800 | [diff] [blame] | 1053 | config ELF_CORE |
| 1054 | default y |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1055 | bool "Enable ELF core dumps" if EXPERT |
Matt Mackall | 708e9a7 | 2006-01-08 01:05:25 -0800 | [diff] [blame] | 1056 | help |
| 1057 | Enable support for generating core dumps. Disabling saves about 4k. |
| 1058 | |
Ralf Baechle | 8761f1a | 2011-06-01 19:05:09 +0100 | [diff] [blame] | 1059 | |
Stas Sergeev | e5e1d3c | 2008-05-07 12:39:56 +0200 | [diff] [blame] | 1060 | config PCSPKR_PLATFORM |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1061 | bool "Enable PC-Speaker support" if EXPERT |
Ralf Baechle | 8761f1a | 2011-06-01 19:05:09 +0100 | [diff] [blame] | 1062 | depends on HAVE_PCSPKR_PLATFORM |
Ralf Baechle | 15f304b | 2011-06-01 19:04:59 +0100 | [diff] [blame] | 1063 | select I8253_LOCK |
Stas Sergeev | e5e1d3c | 2008-05-07 12:39:56 +0200 | [diff] [blame] | 1064 | default y |
| 1065 | help |
| 1066 | This option allows to disable the internal PC-Speaker |
| 1067 | support, saving some memory. |
| 1068 | |
Ralf Baechle | 8761f1a | 2011-06-01 19:05:09 +0100 | [diff] [blame] | 1069 | config HAVE_PCSPKR_PLATFORM |
| 1070 | bool |
| 1071 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | config BASE_FULL |
| 1073 | default y |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1074 | bool "Enable full-sized data structures for core" if EXPERT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | help |
| 1076 | Disabling this option reduces the size of miscellaneous core |
| 1077 | kernel data structures. This saves memory on small machines, |
| 1078 | but may reduce performance. |
| 1079 | |
| 1080 | config FUTEX |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1081 | bool "Enable futex support" if EXPERT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | default y |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 1083 | select RT_MUTEXES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | help |
| 1085 | Disabling this option will cause the kernel to be built without |
| 1086 | support for "fast userspace mutexes". The resulting kernel may not |
| 1087 | run glibc-based applications correctly. |
| 1088 | |
| 1089 | config EPOLL |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1090 | bool "Enable eventpoll support" if EXPERT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | default y |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1092 | select ANON_INODES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | help |
| 1094 | Disabling this option will cause the kernel to be built without |
| 1095 | support for epoll family of system calls. |
| 1096 | |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 1097 | config SIGNALFD |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1098 | bool "Enable signalfd() system call" if EXPERT |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1099 | select ANON_INODES |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 1100 | default y |
| 1101 | help |
| 1102 | Enable the signalfd() system call that allows to receive signals |
| 1103 | on a file descriptor. |
| 1104 | |
| 1105 | If unsure, say Y. |
| 1106 | |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 1107 | config TIMERFD |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1108 | bool "Enable timerfd() system call" if EXPERT |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1109 | select ANON_INODES |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 1110 | default y |
| 1111 | help |
| 1112 | Enable the timerfd() system call that allows to receive timer |
| 1113 | events on a file descriptor. |
| 1114 | |
| 1115 | If unsure, say Y. |
| 1116 | |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 1117 | config EVENTFD |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1118 | bool "Enable eventfd() system call" if EXPERT |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 1119 | select ANON_INODES |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 1120 | default y |
| 1121 | help |
| 1122 | Enable the eventfd() system call that allows to receive both |
| 1123 | kernel notification (ie. KAIO) or userspace notifications. |
| 1124 | |
| 1125 | If unsure, say Y. |
| 1126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | config SHMEM |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1128 | bool "Use full shmem filesystem" if EXPERT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | default y |
| 1130 | depends on MMU |
| 1131 | help |
| 1132 | The shmem is an internal filesystem used to manage shared memory. |
| 1133 | It is backed by swap and manages resource limits. It is also exported |
| 1134 | to userspace as tmpfs if TMPFS is enabled. Disabling this |
| 1135 | option replaces shmem and tmpfs with the much simpler ramfs code, |
| 1136 | which may be appropriate on small systems without swap. |
| 1137 | |
Thomas Petazzoni | ebf3f09 | 2008-10-15 22:05:12 -0700 | [diff] [blame] | 1138 | config AIO |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1139 | bool "Enable AIO support" if EXPERT |
Thomas Petazzoni | ebf3f09 | 2008-10-15 22:05:12 -0700 | [diff] [blame] | 1140 | default y |
| 1141 | help |
| 1142 | This option enables POSIX asynchronous I/O which may by used |
| 1143 | by some high performance threaded applications. Disabling |
| 1144 | this option saves about 7k. |
| 1145 | |
Randy Dunlap | 6befe5f | 2011-04-26 12:33:21 -0700 | [diff] [blame] | 1146 | config EMBEDDED |
| 1147 | bool "Embedded system" |
| 1148 | select EXPERT |
| 1149 | help |
| 1150 | This option should be enabled if compiling the kernel for |
| 1151 | an embedded system so certain expert options are available |
| 1152 | for configuration. |
| 1153 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1154 | config HAVE_PERF_EVENTS |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1155 | bool |
Mike Frysinger | 018df72 | 2009-06-12 13:17:43 -0400 | [diff] [blame] | 1156 | help |
| 1157 | See tools/perf/design.txt for details. |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1158 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 1159 | config PERF_USE_VMALLOC |
| 1160 | bool |
| 1161 | help |
| 1162 | See tools/perf/design.txt for details |
| 1163 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1164 | menu "Kernel Performance Events And Counters" |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1165 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1166 | config PERF_EVENTS |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1167 | bool "Kernel performance events and counters" |
| 1168 | default y if (PROFILING || PERF_COUNTERS) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1169 | depends on HAVE_PERF_EVENTS |
Ingo Molnar | 4c59e46 | 2008-12-08 19:38:33 +0100 | [diff] [blame] | 1170 | select ANON_INODES |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 1171 | select IRQ_WORK |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1172 | help |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1173 | Enable kernel support for various performance events provided |
| 1174 | by software and hardware. |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1175 | |
Thadeu Lima de Souza Cascardo | dd77038 | 2009-10-30 19:32:25 -0200 | [diff] [blame] | 1176 | Software events are supported either built-in or via the |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1177 | use of generic tracepoints. |
| 1178 | |
| 1179 | Most modern CPUs support performance events via performance |
| 1180 | counter registers. These registers count the number of certain |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1181 | types of hw events: such as instructions executed, cachemisses |
| 1182 | suffered, or branches mis-predicted - without slowing down the |
| 1183 | kernel or applications. These registers can also trigger interrupts |
| 1184 | when a threshold number of events have passed - and can thus be |
| 1185 | used to profile the code that runs on that CPU. |
| 1186 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1187 | The Linux Performance Event subsystem provides an abstraction of |
Thadeu Lima de Souza Cascardo | dd77038 | 2009-10-30 19:32:25 -0200 | [diff] [blame] | 1188 | these software and hardware event capabilities, available via a |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1189 | system call and used by the "perf" utility in tools/perf/. It |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1190 | provides per task and per CPU counters, and it provides event |
| 1191 | capabilities on top of those. |
| 1192 | |
| 1193 | Say Y if unsure. |
| 1194 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 1195 | config PERF_COUNTERS |
| 1196 | bool "Kernel performance counters (old config option)" |
| 1197 | depends on HAVE_PERF_EVENTS |
| 1198 | help |
| 1199 | This config has been obsoleted by the PERF_EVENTS |
| 1200 | config option - please see that one for details. |
| 1201 | |
| 1202 | It has no effect on the kernel whether you enable |
| 1203 | it or not, it is a compatibility placeholder. |
| 1204 | |
| 1205 | Say N if unsure. |
| 1206 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 1207 | config DEBUG_PERF_USE_VMALLOC |
| 1208 | default n |
| 1209 | bool "Debug: use vmalloc to back perf mmap() buffers" |
| 1210 | depends on PERF_EVENTS && DEBUG_KERNEL |
| 1211 | select PERF_USE_VMALLOC |
| 1212 | help |
| 1213 | Use vmalloc memory to back perf mmap() buffers. |
| 1214 | |
| 1215 | Mostly useful for debugging the vmalloc code on platforms |
| 1216 | that don't require it. |
| 1217 | |
| 1218 | Say N if unsure. |
| 1219 | |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 1220 | endmenu |
| 1221 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1222 | config VM_EVENT_COUNTERS |
| 1223 | default y |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1224 | bool "Enable VM event counters for /proc/vmstat" if EXPERT |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1225 | help |
Paul Jackson | 2aea4fb | 2006-12-22 01:06:10 -0800 | [diff] [blame] | 1226 | VM event counters are needed for event counts to be shown. |
| 1227 | This option allows the disabling of the VM event counters |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1228 | on EXPERT systems. /proc/vmstat will only show page counts |
Paul Jackson | 2aea4fb | 2006-12-22 01:06:10 -0800 | [diff] [blame] | 1229 | if VM event counters are disabled. |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1230 | |
Thomas Petazzoni | 3d13731 | 2008-08-19 10:28:24 +0200 | [diff] [blame] | 1231 | config PCI_QUIRKS |
| 1232 | default y |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1233 | bool "Enable PCI quirk workarounds" if EXPERT |
Geert Uytterhoeven | 61cfc7e | 2008-10-22 08:53:25 +0200 | [diff] [blame] | 1234 | depends on PCI |
Thomas Petazzoni | 3d13731 | 2008-08-19 10:28:24 +0200 | [diff] [blame] | 1235 | help |
| 1236 | This enables workarounds for various PCI chipset |
| 1237 | bugs/quirks. Disable this only if your target machine is |
| 1238 | unaffected by PCI quirks. |
| 1239 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1240 | config SLUB_DEBUG |
| 1241 | default y |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1242 | bool "Enable SLUB debugging support" if EXPERT |
Christoph Lameter | f6acb63 | 2008-04-29 16:16:06 -0700 | [diff] [blame] | 1243 | depends on SLUB && SYSFS |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1244 | help |
| 1245 | SLUB has extensive debug support features. Disabling these can |
| 1246 | result in significant savings in code size. This also disables |
| 1247 | SLUB sysfs support. /sys/slab will not exist and there will be |
| 1248 | no support for cache validation etc. |
| 1249 | |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 1250 | config COMPAT_BRK |
| 1251 | bool "Disable heap randomization" |
| 1252 | default y |
| 1253 | help |
| 1254 | Randomizing heap placement makes heap exploits harder, but it |
| 1255 | also breaks ancient binaries (including anything libc5 based). |
| 1256 | This option changes the bootup default to heap randomization |
Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 1257 | disabled, and can be overridden at runtime by setting |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 1258 | /proc/sys/kernel/randomize_va_space to 2. |
| 1259 | |
| 1260 | On non-ancient distros (post-2000 ones) N is usually a safe choice. |
| 1261 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1262 | choice |
| 1263 | prompt "Choose SLAB allocator" |
Christoph Lameter | a0acd82 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 1264 | default SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1265 | help |
| 1266 | This option allows to select a slab allocator. |
| 1267 | |
| 1268 | config SLAB |
| 1269 | bool "SLAB" |
| 1270 | help |
| 1271 | The regular slab allocator that is established and known to work |
Christoph Lameter | 3401388 | 2007-05-09 02:32:47 -0700 | [diff] [blame] | 1272 | well in all environments. It organizes cache hot objects in |
Simon Arlott | 02f5621 | 2008-11-05 22:18:19 +0000 | [diff] [blame] | 1273 | per cpu and per node queues. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1274 | |
| 1275 | config SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1276 | bool "SLUB (Unqueued Allocator)" |
| 1277 | help |
| 1278 | SLUB is a slab allocator that minimizes cache line usage |
| 1279 | instead of managing queues of cached objects (SLAB approach). |
| 1280 | Per cpu caching is realized using slabs of objects instead |
| 1281 | of queues of objects. SLUB can use memory efficiently |
Simon Arlott | 02f5621 | 2008-11-05 22:18:19 +0000 | [diff] [blame] | 1282 | and has enhanced diagnostics. SLUB is the default choice for |
| 1283 | a slab allocator. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1284 | |
| 1285 | config SLOB |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1286 | depends on EXPERT |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1287 | bool "SLOB (Simple Allocator)" |
| 1288 | help |
Matt Mackall | 3729145 | 2008-02-04 22:29:38 -0800 | [diff] [blame] | 1289 | SLOB replaces the stock allocator with a drastically simpler |
| 1290 | allocator. SLOB is generally more space efficient but |
| 1291 | does not perform as well on large systems. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1292 | |
| 1293 | endchoice |
| 1294 | |
Jie Zhang | ea63763 | 2009-12-14 18:00:02 -0800 | [diff] [blame] | 1295 | config MMAP_ALLOW_UNINITIALIZED |
| 1296 | bool "Allow mmapped anonymous memory to be uninitialized" |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 1297 | depends on EXPERT && !MMU |
Jie Zhang | ea63763 | 2009-12-14 18:00:02 -0800 | [diff] [blame] | 1298 | default n |
| 1299 | help |
| 1300 | Normally, and according to the Linux spec, anonymous memory obtained |
| 1301 | from mmap() has it's contents cleared before it is passed to |
| 1302 | userspace. Enabling this config option allows you to request that |
| 1303 | mmap() skip that if it is given an MAP_UNINITIALIZED flag, thus |
| 1304 | providing a huge performance boost. If this option is not enabled, |
| 1305 | then the flag will be ignored. |
| 1306 | |
| 1307 | This is taken advantage of by uClibc's malloc(), and also by |
| 1308 | ELF-FDPIC binfmt's brk and stack allocator. |
| 1309 | |
| 1310 | Because of the obvious security issues, this option should only be |
| 1311 | enabled on embedded devices where you control what is run in |
| 1312 | userspace. Since that isn't generally a problem on no-MMU systems, |
| 1313 | it is normally safe to say Y here. |
| 1314 | |
| 1315 | See Documentation/nommu-mmap.txt for more information. |
| 1316 | |
Mathieu Desnoyers | 125e564 | 2008-02-02 15:10:36 -0500 | [diff] [blame] | 1317 | config PROFILING |
Robert Richter | b309a29 | 2010-02-26 15:01:23 +0100 | [diff] [blame] | 1318 | bool "Profiling support" |
Mathieu Desnoyers | 125e564 | 2008-02-02 15:10:36 -0500 | [diff] [blame] | 1319 | help |
| 1320 | Say Y here to enable the extended profiling support mechanisms used |
| 1321 | by profilers such as OProfile. |
| 1322 | |
Ingo Molnar | 5f87f11 | 2008-07-23 14:15:22 +0200 | [diff] [blame] | 1323 | # |
| 1324 | # Place an empty function call at each tracepoint site. Can be |
| 1325 | # dynamically changed for a probe function. |
| 1326 | # |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 1327 | config TRACEPOINTS |
Ingo Molnar | 5f87f11 | 2008-07-23 14:15:22 +0200 | [diff] [blame] | 1328 | bool |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 1329 | |
Mathieu Desnoyers | fb32e03 | 2008-02-02 15:10:33 -0500 | [diff] [blame] | 1330 | source "arch/Kconfig" |
| 1331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | endmenu # General setup |
| 1333 | |
Dmitry Baryshkov | ee7e5516 | 2008-06-29 14:18:46 +0400 | [diff] [blame] | 1334 | config HAVE_GENERIC_DMA_COHERENT |
| 1335 | bool |
| 1336 | default n |
| 1337 | |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 1338 | config SLABINFO |
| 1339 | bool |
| 1340 | depends on PROC_FS |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1341 | depends on SLAB || SLUB_DEBUG |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 1342 | default y |
| 1343 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 1344 | config RT_MUTEXES |
| 1345 | boolean |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 1346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | config BASE_SMALL |
| 1348 | int |
| 1349 | default 0 if BASE_FULL |
| 1350 | default 1 if !BASE_FULL |
| 1351 | |
Jan Engelhardt | 66da573 | 2007-07-15 23:39:29 -0700 | [diff] [blame] | 1352 | menuconfig MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | bool "Enable loadable module support" |
| 1354 | help |
| 1355 | Kernel modules are small pieces of compiled code which can |
| 1356 | be inserted in the running kernel, rather than being |
| 1357 | permanently built into the kernel. You use the "modprobe" |
| 1358 | tool to add (and sometimes remove) them. If you say Y here, |
| 1359 | many parts of the kernel can be built as modules (by |
| 1360 | answering M instead of Y where indicated): this is most |
| 1361 | useful for infrequently used options which are not required |
| 1362 | for booting. For more information, see the man pages for |
| 1363 | modprobe, lsmod, modinfo, insmod and rmmod. |
| 1364 | |
| 1365 | If you say Y here, you will need to run "make |
| 1366 | modules_install" to put the modules under /lib/modules/ |
| 1367 | where modprobe can find them (you may need to be root to do |
| 1368 | this). |
| 1369 | |
| 1370 | If unsure, say Y. |
| 1371 | |
Robert P. J. Day | 0b0de14 | 2008-08-04 13:31:32 -0400 | [diff] [blame] | 1372 | if MODULES |
| 1373 | |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1374 | config MODULE_FORCE_LOAD |
| 1375 | bool "Forced module loading" |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1376 | default n |
| 1377 | help |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1378 | Allow loading of modules without version information (ie. modprobe |
| 1379 | --force). Forced module loading sets the 'F' (forced) taint flag and |
| 1380 | is usually a really bad idea. |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | config MODULE_UNLOAD |
| 1383 | bool "Module unloading" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | help |
| 1385 | Without this option you will not be able to unload any |
| 1386 | modules (note that some modules may not be unloadable |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 1387 | anyway), which makes your kernel smaller, faster |
| 1388 | and simpler. If unsure, say Y. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | |
| 1390 | config MODULE_FORCE_UNLOAD |
| 1391 | bool "Forced module unloading" |
| 1392 | depends on MODULE_UNLOAD && EXPERIMENTAL |
| 1393 | help |
| 1394 | This option allows you to force a module to unload, even if the |
| 1395 | kernel believes it is unsafe: the kernel will remove the module |
| 1396 | without waiting for anyone to stop using it (using the -f option to |
| 1397 | rmmod). This is mainly for kernel developers and desperate users. |
| 1398 | If unsure, say N. |
| 1399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | config MODVERSIONS |
Sam Ravnborg | 0d54164 | 2005-12-26 23:04:02 +0100 | [diff] [blame] | 1401 | bool "Module versioning support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | help |
| 1403 | Usually, you have to use modules compiled with your kernel. |
| 1404 | Saying Y here makes it sometimes possible to use modules |
| 1405 | compiled for different kernels, by adding enough information |
| 1406 | to the modules to (hopefully) spot any changes which would |
| 1407 | make them incompatible with the kernel you are running. If |
| 1408 | unsure, say N. |
| 1409 | |
| 1410 | config MODULE_SRCVERSION_ALL |
| 1411 | bool "Source checksum for all modules" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | help |
| 1413 | Modules which contain a MODULE_VERSION get an extra "srcversion" |
| 1414 | field inserted into their modinfo section, which contains a |
| 1415 | sum of the source files which made it. This helps maintainers |
| 1416 | see exactly which source was used to build a module (since |
| 1417 | others sometimes change the module source without updating |
| 1418 | the version). With this option, such a "srcversion" field |
| 1419 | will be created for all modules. If unsure, say N. |
| 1420 | |
Robert P. J. Day | 0b0de14 | 2008-08-04 13:31:32 -0400 | [diff] [blame] | 1421 | endif # MODULES |
| 1422 | |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 1423 | config INIT_ALL_POSSIBLE |
| 1424 | bool |
| 1425 | help |
| 1426 | Back when each arch used to define their own cpu_online_map and |
| 1427 | cpu_possible_map, some of them chose to initialize cpu_possible_map |
| 1428 | with all 1s, and others with all 0s. When they were centralised, |
| 1429 | 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] | 1430 | and have several arch maintainers pursuing me down dark alleys. |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 1431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | config STOP_MACHINE |
| 1433 | bool |
| 1434 | default y |
| 1435 | depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU |
| 1436 | help |
| 1437 | Need stop_machine() primitive. |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 1438 | |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 1439 | source "block/Kconfig" |
Avi Kivity | e98c320 | 2007-10-16 23:27:31 -0700 | [diff] [blame] | 1440 | |
| 1441 | config PREEMPT_NOTIFIERS |
| 1442 | bool |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1443 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1444 | config PADATA |
| 1445 | depends on SMP |
| 1446 | bool |
| 1447 | |
Thomas Gleixner | 6beb000 | 2009-11-09 15:21:34 +0000 | [diff] [blame] | 1448 | source "kernel/Kconfig.locks" |