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 | |
Al Boldi | ff0cfc6 | 2007-07-31 00:39:23 -0700 | [diff] [blame] | 24 | menu "General setup" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | config EXPERIMENTAL |
| 27 | bool "Prompt for development and/or incomplete code/drivers" |
| 28 | ---help--- |
| 29 | Some of the various things that Linux supports (such as network |
| 30 | drivers, file systems, network protocols, etc.) can be in a state |
| 31 | of development where the functionality, stability, or the level of |
| 32 | testing is not yet high enough for general use. This is usually |
| 33 | known as the "alpha-test" phase among developers. If a feature is |
| 34 | currently in alpha-test, then the developers usually discourage |
| 35 | uninformed widespread use of this feature by the general public to |
| 36 | avoid "Why doesn't this work?" type mail messages. However, active |
| 37 | testing and use of these systems is welcomed. Just be aware that it |
| 38 | may not meet the normal level of reliability or it may fail to work |
| 39 | in some special cases. Detailed bug reports from people familiar |
| 40 | with the kernel internals are usually welcomed by the developers |
| 41 | (before submitting bug reports, please read the documents |
| 42 | <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, |
| 43 | <file:Documentation/BUG-HUNTING>, and |
| 44 | <file:Documentation/oops-tracing.txt> in the kernel source). |
| 45 | |
| 46 | This option will also make obsoleted drivers available. These are |
| 47 | drivers that have been replaced by something else, and/or are |
| 48 | scheduled to be removed in a future kernel release. |
| 49 | |
| 50 | Unless you intend to help test and develop a feature or driver that |
| 51 | falls into this category, or you have a situation that requires |
| 52 | using these features, you should probably say N here, which will |
| 53 | cause the configurator to present you with fewer choices. If |
| 54 | you say Y here, you will be offered the choice of using features or |
| 55 | drivers that are currently considered to be in the alpha-test phase. |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | config BROKEN |
| 58 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | config BROKEN_ON_SMP |
| 61 | bool |
| 62 | depends on BROKEN || !SMP |
| 63 | default y |
| 64 | |
| 65 | config LOCK_KERNEL |
| 66 | bool |
| 67 | depends on SMP || PREEMPT |
| 68 | default y |
| 69 | |
| 70 | config INIT_ENV_ARG_LIMIT |
| 71 | int |
Adrian Bunk | dd673bc | 2006-06-30 01:55:51 -0700 | [diff] [blame] | 72 | default 32 if !UML |
| 73 | default 128 if UML |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | help |
Randy Dunlap | 34ad92c | 2005-10-30 15:01:46 -0800 | [diff] [blame] | 75 | Maximum of each of the number of arguments and environment |
| 76 | variables passed to init from the kernel command line. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | config LOCALVERSION |
| 80 | string "Local version - append to kernel release" |
| 81 | help |
| 82 | Append an extra string to the end of your kernel version. |
| 83 | This will show up when you type uname, for example. |
| 84 | The string you set here will be appended after the contents of |
| 85 | any files with a filename matching localversion* in your |
| 86 | object and source tree, in that order. Your total string can |
| 87 | be a maximum of 64 characters. |
| 88 | |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 89 | config LOCALVERSION_AUTO |
| 90 | bool "Automatically append version information to the version string" |
| 91 | default y |
| 92 | help |
| 93 | This will try to automatically determine if the current tree is a |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 94 | release tree by looking for git tags that belong to the current |
| 95 | top of tree revision. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 96 | |
| 97 | 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] | 98 | 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] | 99 | appended after any matching localversion* files, and after the value |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 100 | set in CONFIG_LOCALVERSION. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 101 | |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 102 | (The actual string used here is the first eight characters produced |
| 103 | by running the command: |
| 104 | |
| 105 | $ git rev-parse --verify HEAD |
| 106 | |
| 107 | which is done within the script "scripts/setlocalversion".) |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 108 | |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 109 | config HAVE_KERNEL_GZIP |
| 110 | bool |
| 111 | |
| 112 | config HAVE_KERNEL_BZIP2 |
| 113 | bool |
| 114 | |
| 115 | config HAVE_KERNEL_LZMA |
| 116 | bool |
| 117 | |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 118 | config HAVE_KERNEL_LZO |
| 119 | bool |
| 120 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 121 | choice |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 122 | prompt "Kernel compression mode" |
| 123 | default KERNEL_GZIP |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 124 | 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] | 125 | help |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 126 | The linux kernel is a kind of self-extracting executable. |
| 127 | Several compression algorithms are available, which differ |
| 128 | in efficiency, compression and decompression speed. |
| 129 | Compression speed is only relevant when building a kernel. |
| 130 | Decompression speed is relevant at each boot. |
| 131 | |
| 132 | If you have any problems with bzip2 or lzma compressed |
| 133 | kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older |
| 134 | version of this functionality (bzip2 only), for 2.4, was |
| 135 | supplied by Christian Ludwig) |
| 136 | |
| 137 | High compression options are mostly useful for users, who |
| 138 | are low on disk space (embedded systems), but for whom ram |
| 139 | size matters less. |
| 140 | |
| 141 | If in doubt, select 'gzip' |
| 142 | |
| 143 | config KERNEL_GZIP |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 144 | bool "Gzip" |
| 145 | depends on HAVE_KERNEL_GZIP |
| 146 | help |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 147 | The old and tried gzip compression. It provides a good balance |
| 148 | between compression ratio and decompression speed. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 149 | |
| 150 | config KERNEL_BZIP2 |
| 151 | bool "Bzip2" |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 152 | depends on HAVE_KERNEL_BZIP2 |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 153 | help |
| 154 | Its compression ratio and speed is intermediate. |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 155 | Decompression speed is slowest among the three. The kernel |
| 156 | size is about 10% smaller with bzip2, in comparison to gzip. |
| 157 | Bzip2 uses a large amount of memory. For modern kernels you |
| 158 | will need at least 8MB RAM or more for booting. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 159 | |
| 160 | config KERNEL_LZMA |
H. Peter Anvin | 2e9f3bd | 2009-01-04 15:41:25 -0800 | [diff] [blame] | 161 | bool "LZMA" |
| 162 | depends on HAVE_KERNEL_LZMA |
| 163 | help |
| 164 | The most recent compression algorithm. |
| 165 | Its ratio is best, decompression speed is between the other |
| 166 | two. Compression is slowest. The kernel size is about 33% |
| 167 | smaller with LZMA in comparison to gzip. |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 168 | |
Albin Tonnerre | 7dd65fe | 2010-01-08 14:42:42 -0800 | [diff] [blame] | 169 | config KERNEL_LZO |
| 170 | bool "LZO" |
| 171 | depends on HAVE_KERNEL_LZO |
| 172 | help |
| 173 | Its compression ratio is the poorest among the 4. The kernel |
| 174 | size is about about 10% bigger than gzip; however its speed |
| 175 | (both compression and decompression) is the fastest. |
| 176 | |
Alain Knaff | 30d65db | 2009-01-04 22:46:17 +0100 | [diff] [blame] | 177 | endchoice |
| 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | config SWAP |
| 180 | bool "Support for paging of anonymous memory (swap)" |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 181 | depends on MMU && BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | default y |
| 183 | help |
| 184 | This option allows you to choose whether you want to have support |
Jesper Juhl | 92c3504 | 2006-01-15 02:40:08 +0100 | [diff] [blame] | 185 | 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] | 186 | used to provide more virtual memory than the actual RAM present |
| 187 | in your computer. If unsure say Y. |
| 188 | |
| 189 | config SYSVIPC |
| 190 | bool "System V IPC" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | ---help--- |
| 192 | Inter Process Communication is a suite of library functions and |
| 193 | system calls which let processes (running programs) synchronize and |
| 194 | exchange information. It is generally considered to be a good thing, |
| 195 | and some programs won't run unless you say Y here. In particular, if |
| 196 | you want to run the DOS emulator dosemu under Linux (read the |
| 197 | DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), |
| 198 | you'll need to say Y here. |
| 199 | |
| 200 | You can find documentation about IPC with "info ipc" and also in |
| 201 | section 6.4 of the Linux Programmer's Guide, available from |
| 202 | <http://www.tldp.org/guides.html>. |
| 203 | |
Eric W. Biederman | a5494dc | 2007-02-14 00:34:06 -0800 | [diff] [blame] | 204 | config SYSVIPC_SYSCTL |
| 205 | bool |
| 206 | depends on SYSVIPC |
| 207 | depends on SYSCTL |
| 208 | default y |
| 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | config POSIX_MQUEUE |
| 211 | bool "POSIX Message Queues" |
| 212 | depends on NET && EXPERIMENTAL |
| 213 | ---help--- |
| 214 | POSIX variant of message queues is a part of IPC. In POSIX message |
| 215 | queues every message has a priority which decides about succession |
| 216 | of receiving it by a process. If you want to compile and run |
| 217 | 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] | 218 | queues (functions mq_*) say Y here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | POSIX message queues are visible as a filesystem called 'mqueue' |
| 221 | and can be mounted somewhere if you want to do filesystem |
| 222 | operations on message queues. |
| 223 | |
| 224 | If unsure, say Y. |
| 225 | |
Serge E. Hallyn | bdc8e5f | 2009-04-06 19:01:11 -0700 | [diff] [blame] | 226 | config POSIX_MQUEUE_SYSCTL |
| 227 | bool |
| 228 | depends on POSIX_MQUEUE |
| 229 | depends on SYSCTL |
| 230 | default y |
| 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | config BSD_PROCESS_ACCT |
| 233 | bool "BSD Process Accounting" |
| 234 | help |
| 235 | If you say Y here, a user level program will be able to instruct the |
| 236 | kernel (via a special system call) to write process accounting |
| 237 | information to a file: whenever a process exits, information about |
| 238 | that process will be appended to the file by the kernel. The |
| 239 | information includes things such as creation time, owning user, |
| 240 | command name, memory usage, controlling terminal etc. (the complete |
| 241 | list is in the struct acct in <file:include/linux/acct.h>). It is |
| 242 | up to the user level program to do useful things with this |
| 243 | information. This is generally a good idea, so say Y. |
| 244 | |
| 245 | config BSD_PROCESS_ACCT_V3 |
| 246 | bool "BSD Process Accounting version 3 file format" |
| 247 | depends on BSD_PROCESS_ACCT |
| 248 | default n |
| 249 | help |
| 250 | If you say Y here, the process accounting information is written |
| 251 | in a new file format that also logs the process IDs of each |
| 252 | process and it's parent. Note that this file format is incompatible |
| 253 | with previous v0/v1/v2 file formats, so you will need updated tools |
| 254 | for processing it. A preliminary version of these tools is available |
S.Çağlar Onur | 37a4c94 | 2008-06-18 11:45:13 +0300 | [diff] [blame] | 255 | at <http://www.gnu.org/software/acct/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 257 | config TASKSTATS |
| 258 | bool "Export task/process statistics through netlink (EXPERIMENTAL)" |
| 259 | depends on NET |
| 260 | default n |
| 261 | help |
| 262 | Export selected statistics for tasks/processes through the |
| 263 | generic netlink interface. Unlike BSD process accounting, the |
| 264 | statistics are available during the lifetime of tasks/processes as |
| 265 | responses to commands. Like BSD accounting, they are sent to user |
| 266 | space on task exit. |
| 267 | |
| 268 | Say N if unsure. |
| 269 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 270 | config TASK_DELAY_ACCT |
| 271 | bool "Enable per-task delay accounting (EXPERIMENTAL)" |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 272 | depends on TASKSTATS |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 273 | help |
| 274 | Collect information on time spent by a task waiting for system |
| 275 | resources like cpu, synchronous block I/O completion and swapping |
| 276 | in pages. Such statistics can help in setting a task's priorities |
| 277 | relative to other tasks for cpu, io, rss limits etc. |
| 278 | |
| 279 | Say N if unsure. |
| 280 | |
Alexey Dobriyan | 18f705f | 2007-02-10 01:46:44 -0800 | [diff] [blame] | 281 | config TASK_XACCT |
| 282 | bool "Enable extended accounting over taskstats (EXPERIMENTAL)" |
| 283 | depends on TASKSTATS |
| 284 | help |
| 285 | Collect extended task accounting data and send the data |
| 286 | to userland for processing over the taskstats interface. |
| 287 | |
| 288 | Say N if unsure. |
| 289 | |
| 290 | config TASK_IO_ACCOUNTING |
| 291 | bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" |
| 292 | depends on TASK_XACCT |
| 293 | help |
| 294 | Collect information on the number of bytes of storage I/O which this |
| 295 | task has caused. |
| 296 | |
| 297 | Say N if unsure. |
| 298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | config AUDIT |
| 300 | bool "Auditing support" |
Chris Wright | 804a6a49 | 2005-05-11 10:52:45 +0100 | [diff] [blame] | 301 | depends on NET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | help |
| 303 | Enable auditing infrastructure that can be used with another |
| 304 | kernel subsystem, such as SELinux (which requires this for |
| 305 | logging of avc messages output). Does not do system-call |
| 306 | auditing without CONFIG_AUDITSYSCALL. |
| 307 | |
| 308 | config AUDITSYSCALL |
| 309 | bool "Enable system-call auditing support" |
Kumar Gala | 022382a | 2009-10-16 07:21:37 +0000 | [diff] [blame] | 310 | depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | default y if SECURITY_SELINUX |
| 312 | help |
| 313 | Enable low-overhead system-call auditing infrastructure that |
| 314 | can be used independently or with another kernel subsystem, |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 315 | such as SELinux. To use audit's filesystem watch feature, please |
| 316 | ensure that INOTIFY is configured. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 318 | config AUDIT_TREE |
| 319 | def_bool y |
Eric Paris | 63c882a | 2009-05-21 17:02:01 -0400 | [diff] [blame] | 320 | depends on AUDITSYSCALL |
| 321 | select INOTIFY |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 322 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 323 | menu "RCU Subsystem" |
| 324 | |
| 325 | choice |
| 326 | prompt "RCU Implementation" |
Paul E. McKenney | 31c9a24 | 2009-04-02 21:06:25 -0700 | [diff] [blame] | 327 | default TREE_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 328 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 329 | config TREE_RCU |
| 330 | bool "Tree-based hierarchical RCU" |
| 331 | help |
| 332 | This option selects the RCU implementation that is |
| 333 | designed for very large SMP system with hundreds or |
Paul E. McKenney | c17ef45 | 2009-06-23 17:12:47 -0700 | [diff] [blame] | 334 | thousands of CPUs. It also scales down nicely to |
| 335 | smaller systems. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 336 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 337 | config TREE_PREEMPT_RCU |
| 338 | bool "Preemptable tree-based hierarchical RCU" |
| 339 | depends on PREEMPT |
| 340 | help |
| 341 | This option selects the RCU implementation that is |
| 342 | designed for very large SMP systems with hundreds or |
| 343 | thousands of CPUs, but for which real-time response |
Paul E. McKenney | bbe3eae | 2009-09-13 09:15:08 -0700 | [diff] [blame] | 344 | is also required. It also scales down nicely to |
| 345 | smaller systems. |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 346 | |
Paul E. McKenney | 9b1d82f | 2009-10-25 19:03:50 -0700 | [diff] [blame] | 347 | config TINY_RCU |
| 348 | bool "UP-only small-memory-footprint RCU" |
| 349 | depends on !SMP |
| 350 | help |
| 351 | This option selects the RCU implementation that is |
| 352 | designed for UP systems from which real-time response |
| 353 | is not required. This option greatly reduces the |
| 354 | memory footprint of RCU. |
| 355 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 356 | endchoice |
| 357 | |
| 358 | config RCU_TRACE |
| 359 | bool "Enable tracing for RCU" |
Paul E. McKenney | 6b3ef48 | 2009-08-22 13:56:53 -0700 | [diff] [blame] | 360 | depends on TREE_RCU || TREE_PREEMPT_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 361 | help |
| 362 | This option provides tracing in RCU which presents stats |
| 363 | in debugfs for debugging RCU implementation. |
| 364 | |
| 365 | Say Y here if you want to enable RCU tracing |
| 366 | Say N if you are unsure. |
| 367 | |
| 368 | config RCU_FANOUT |
| 369 | int "Tree-based hierarchical RCU fanout value" |
| 370 | range 2 64 if 64BIT |
| 371 | range 2 32 if !64BIT |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 372 | depends on TREE_RCU || TREE_PREEMPT_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 373 | default 64 if 64BIT |
| 374 | default 32 if !64BIT |
| 375 | help |
| 376 | This option controls the fanout of hierarchical implementations |
| 377 | of RCU, allowing RCU to work efficiently on machines with |
| 378 | large numbers of CPUs. This value must be at least the cube |
| 379 | root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit |
| 380 | systems and up to 262,144 for 64-bit systems. |
| 381 | |
| 382 | Select a specific number if testing RCU itself. |
| 383 | Take the default if unsure. |
| 384 | |
| 385 | config RCU_FANOUT_EXACT |
| 386 | bool "Disable tree-based hierarchical RCU auto-balancing" |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 387 | depends on TREE_RCU || TREE_PREEMPT_RCU |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 388 | default n |
| 389 | help |
| 390 | This option forces use of the exact RCU_FANOUT value specified, |
| 391 | regardless of imbalances in the hierarchy. This is useful for |
| 392 | testing RCU itself, and might one day be useful on systems with |
| 393 | strong NUMA behavior. |
| 394 | |
| 395 | Without RCU_FANOUT_EXACT, the code will balance the hierarchy. |
| 396 | |
| 397 | Say N if unsure. |
| 398 | |
Paul E. McKenney | 8bd93a2 | 2010-02-22 17:04:59 -0800 | [diff] [blame] | 399 | config RCU_FAST_NO_HZ |
| 400 | bool "Accelerate last non-dyntick-idle CPU's grace periods" |
| 401 | depends on TREE_RCU && NO_HZ && SMP |
| 402 | default n |
| 403 | help |
| 404 | This option causes RCU to attempt to accelerate grace periods |
| 405 | in order to allow the final CPU to enter dynticks-idle state |
| 406 | more quickly. On the other hand, this option increases the |
| 407 | overhead of the dynticks-idle checking, particularly on systems |
| 408 | with large numbers of CPUs. |
| 409 | |
| 410 | Say Y if energy efficiency is critically important, particularly |
| 411 | if you have relatively few CPUs. |
| 412 | |
| 413 | Say N if you are unsure. |
| 414 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 415 | config TREE_RCU_TRACE |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 416 | def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 417 | select DEBUG_FS |
| 418 | help |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 419 | This option provides tracing for the TREE_RCU and |
| 420 | TREE_PREEMPT_RCU implementations, permitting Makefile to |
| 421 | trivially select kernel/rcutree_trace.c. |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 422 | |
Mike Travis | c903ff8 | 2009-01-15 12:28:29 -0800 | [diff] [blame] | 423 | endmenu # "RCU Subsystem" |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | config IKCONFIG |
Ross Biro | f2443ab | 2006-09-30 23:27:25 -0700 | [diff] [blame] | 426 | tristate "Kernel .config support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | ---help--- |
| 428 | This option enables the complete Linux kernel ".config" file |
| 429 | contents to be saved in the kernel. It provides documentation |
| 430 | of which kernel options are used in a running kernel or in an |
| 431 | on-disk kernel. This information can be extracted from the kernel |
| 432 | image file with the script scripts/extract-ikconfig and used as |
| 433 | input to rebuild the current kernel or to build another kernel. |
| 434 | It can also be extracted from a running kernel by reading |
| 435 | /proc/config.gz if enabled (below). |
| 436 | |
| 437 | config IKCONFIG_PROC |
| 438 | bool "Enable access to .config through /proc/config.gz" |
| 439 | depends on IKCONFIG && PROC_FS |
| 440 | ---help--- |
| 441 | This option enables access to the kernel configuration file |
| 442 | through /proc/config.gz. |
| 443 | |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 444 | config LOG_BUF_SHIFT |
| 445 | int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" |
| 446 | range 12 21 |
Adrian Bunk | f17a32e | 2008-04-29 00:58:58 -0700 | [diff] [blame] | 447 | default 17 |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 448 | help |
| 449 | Select kernel log buffer size as a power of 2. |
Adrian Bunk | f17a32e | 2008-04-29 00:58:58 -0700 | [diff] [blame] | 450 | Examples: |
| 451 | 17 => 128 KB |
| 452 | 16 => 64 KB |
| 453 | 15 => 32 KB |
| 454 | 14 => 16 KB |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 455 | 13 => 8 KB |
| 456 | 12 => 4 KB |
| 457 | |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 458 | # |
| 459 | # Architectures with an unreliable sched_clock() should select this: |
| 460 | # |
| 461 | config HAVE_UNSTABLE_SCHED_CLOCK |
| 462 | bool |
| 463 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 464 | menuconfig CGROUPS |
| 465 | boolean "Control Group support" |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 466 | help |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 467 | This option adds support for grouping sets of processes together, for |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 468 | use with process control subsystems such as Cpusets, CFS, memory |
| 469 | controls or device isolation. |
| 470 | See |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 471 | - Documentation/scheduler/sched-design-CFS.txt (CFS) |
Li Zefan | 45ce80f | 2009-01-15 13:50:59 -0800 | [diff] [blame] | 472 | - Documentation/cgroups/ (features for grouping, isolation |
| 473 | and resource control) |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 474 | |
| 475 | Say N if unsure. |
| 476 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 477 | if CGROUPS |
| 478 | |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 479 | config CGROUP_DEBUG |
| 480 | bool "Example debug cgroup subsystem" |
| 481 | depends on CGROUPS |
Paul Menage | 418d7d8 | 2008-04-29 01:00:05 -0700 | [diff] [blame] | 482 | default n |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 483 | help |
| 484 | This option enables a simple cgroup subsystem that |
| 485 | exports useful debugging information about the cgroups |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 486 | framework. |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 487 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 488 | Say N if unsure. |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 489 | |
Serge E. Hallyn | 858d72e | 2007-10-18 23:39:45 -0700 | [diff] [blame] | 490 | config CGROUP_NS |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 491 | bool "Namespace cgroup subsystem" |
| 492 | depends on CGROUPS |
| 493 | help |
| 494 | Provides a simple namespace cgroup subsystem to |
| 495 | provide hierarchical naming of sets of namespaces, |
| 496 | for instance virtual servers and checkpoint/restart |
| 497 | jobs. |
Serge E. Hallyn | 858d72e | 2007-10-18 23:39:45 -0700 | [diff] [blame] | 498 | |
Matt Helsley | dc52ddc | 2008-10-18 20:27:21 -0700 | [diff] [blame] | 499 | config CGROUP_FREEZER |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 500 | bool "Freezer cgroup subsystem" |
| 501 | depends on CGROUPS |
| 502 | help |
| 503 | Provides a way to freeze and unfreeze all tasks in a |
Matt Helsley | dc52ddc | 2008-10-18 20:27:21 -0700 | [diff] [blame] | 504 | cgroup. |
| 505 | |
Serge E. Hallyn | 08ce5f1 | 2008-04-29 01:00:10 -0700 | [diff] [blame] | 506 | config CGROUP_DEVICE |
| 507 | bool "Device controller for cgroups" |
| 508 | depends on CGROUPS && EXPERIMENTAL |
| 509 | help |
| 510 | Provides a cgroup implementing whitelists for devices which |
| 511 | a process in the cgroup can mknod or open. |
| 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | config CPUSETS |
| 514 | bool "Cpuset support" |
Paul Menage | db7f47c | 2009-04-02 16:57:55 -0700 | [diff] [blame] | 515 | depends on CGROUPS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | help |
Randy Dunlap | d9fd8a6 | 2005-07-27 11:45:11 -0700 | [diff] [blame] | 517 | This option will let you create and manage CPUSETs which |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | allow dynamically partitioning a system into sets of CPUs and |
| 519 | Memory Nodes and assigning tasks to run only within those sets. |
| 520 | This is primarily useful on large SMP or NUMA systems. |
| 521 | |
| 522 | Say N if unsure. |
| 523 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 524 | config PROC_PID_CPUSET |
| 525 | bool "Include legacy /proc/<pid>/cpuset file" |
| 526 | depends on CPUSETS |
| 527 | default y |
| 528 | |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 529 | config CGROUP_CPUACCT |
| 530 | bool "Simple CPU accounting cgroup subsystem" |
| 531 | depends on CGROUPS |
| 532 | help |
| 533 | Provides a simple Resource Controller for monitoring the |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 534 | total CPU consumed by the tasks in a cgroup. |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 535 | |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 536 | config RESOURCE_COUNTERS |
| 537 | bool "Resource counters" |
| 538 | help |
| 539 | This option enables controller independent resource accounting |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 540 | infrastructure that works with cgroups. |
Pavel Emelianov | e552b66 | 2008-02-07 00:13:49 -0800 | [diff] [blame] | 541 | depends on CGROUPS |
| 542 | |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 543 | config CGROUP_MEM_RES_CTLR |
| 544 | bool "Memory Resource Controller for Control Groups" |
| 545 | depends on CGROUPS && RESOURCE_COUNTERS |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 546 | select MM_OWNER |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 547 | help |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 548 | Provides a memory resource controller that manages both anonymous |
Thadeu Lima de Souza Cascardo | 21acb9c | 2009-02-04 10:12:08 +0100 | [diff] [blame] | 549 | memory and page cache. (See Documentation/cgroups/memory.txt) |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 550 | |
| 551 | Note that setting this option increases fixed memory overhead |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 552 | associated with each page of memory in the system. By this, |
| 553 | 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory |
| 554 | usage tracking struct at boot. Total amount of this is printed out |
| 555 | at boot. |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 556 | |
| 557 | Only enable when you're ok with these trade offs and really |
KAMEZAWA Hiroyuki | 84ad6d7 | 2008-10-29 14:01:06 -0700 | [diff] [blame] | 558 | sure you need the memory resource controller. Even when you enable |
| 559 | this, you can set "cgroup_disable=memory" at your boot option to |
| 560 | disable memory resource controller and you can avoid overheads. |
Li Zefan | c9d5409 | 2009-01-07 18:07:35 -0800 | [diff] [blame] | 561 | (and lose benefits of memory resource controller) |
Balbir Singh | 00f0b82 | 2008-03-04 14:28:39 -0800 | [diff] [blame] | 562 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 563 | This config option also selects MM_OWNER config option, which |
| 564 | could in turn add some fork/exit overhead. |
| 565 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 566 | config CGROUP_MEM_RES_CTLR_SWAP |
| 567 | bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)" |
| 568 | depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL |
| 569 | help |
| 570 | Add swap management feature to memory resource controller. When you |
| 571 | enable this, you can limit mem+swap usage per cgroup. In other words, |
| 572 | when you disable this, memory resource controller has no cares to |
| 573 | usage of swap...a process can exhaust all of the swap. This extension |
| 574 | is useful when you want to avoid exhaustion swap but this itself |
| 575 | adds more overheads and consumes memory for remembering information. |
| 576 | Especially if you use 32bit system or small memory system, please |
| 577 | be careful about enabling this. When memory resource controller |
| 578 | is disabled by boot option, this will be automatically disabled and |
| 579 | there will be no overhead from this. Even when you set this config=y, |
| 580 | if boot option "noswapaccount" is set, swap will not be accounted. |
KAMEZAWA Hiroyuki | 627991a | 2009-04-02 16:57:47 -0700 | [diff] [blame] | 581 | Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page |
| 582 | size is 4096bytes, 512k per 1Gbytes of swap. |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 583 | |
Dhaval Giani | 7c94143 | 2010-01-20 13:26:18 +0100 | [diff] [blame] | 584 | menuconfig CGROUP_SCHED |
| 585 | bool "Group CPU scheduler" |
| 586 | depends on EXPERIMENTAL && CGROUPS |
| 587 | default n |
| 588 | help |
| 589 | This feature lets CPU scheduler recognize task groups and control CPU |
| 590 | bandwidth allocation to such task groups. It uses cgroups to group |
| 591 | tasks. |
| 592 | |
| 593 | if CGROUP_SCHED |
| 594 | config FAIR_GROUP_SCHED |
| 595 | bool "Group scheduling for SCHED_OTHER" |
| 596 | depends on CGROUP_SCHED |
| 597 | default CGROUP_SCHED |
| 598 | |
| 599 | config RT_GROUP_SCHED |
| 600 | bool "Group scheduling for SCHED_RR/FIFO" |
| 601 | depends on EXPERIMENTAL |
| 602 | depends on CGROUP_SCHED |
| 603 | default n |
| 604 | help |
| 605 | This feature lets you explicitly allocate real CPU bandwidth |
| 606 | to users or control groups (depending on the "Basis for grouping tasks" |
| 607 | setting below. If enabled, it will also make it impossible to |
| 608 | schedule realtime tasks for non-root users until you allocate |
| 609 | realtime bandwidth for them. |
| 610 | See Documentation/scheduler/sched-rt-group.txt for more information. |
| 611 | |
| 612 | endif #CGROUP_SCHED |
| 613 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 614 | endif # CGROUPS |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 615 | |
Li Zefan | 23964d2 | 2009-01-15 13:50:58 -0800 | [diff] [blame] | 616 | config MM_OWNER |
| 617 | bool |
KAMEZAWA Hiroyuki | 5cdc38f | 2009-01-07 18:07:30 -0800 | [diff] [blame] | 618 | |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 619 | config SYSFS_DEPRECATED |
Ingo Molnar | d47846c | 2008-03-04 14:54:47 +0100 | [diff] [blame] | 620 | bool |
| 621 | |
| 622 | config SYSFS_DEPRECATED_V2 |
Uwe Kleine-König | 9e9868a | 2009-12-03 19:58:00 +0100 | [diff] [blame] | 623 | bool "enable deprecated sysfs features to support old userspace tools" |
Randy Dunlap | 9148fe8 | 2007-12-31 10:05:34 -0800 | [diff] [blame] | 624 | depends on SYSFS |
Kay Sievers | f6ee649 | 2009-04-16 19:56:37 +0200 | [diff] [blame] | 625 | default n |
Ingo Molnar | d47846c | 2008-03-04 14:54:47 +0100 | [diff] [blame] | 626 | select SYSFS_DEPRECATED |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 627 | help |
Kay Sievers | fce3e80 | 2008-11-01 14:03:00 +0100 | [diff] [blame] | 628 | This option switches the layout of sysfs to the deprecated |
Kay Sievers | f6ee649 | 2009-04-16 19:56:37 +0200 | [diff] [blame] | 629 | version. Do not use it on recent distributions. |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 630 | |
Kay Sievers | fce3e80 | 2008-11-01 14:03:00 +0100 | [diff] [blame] | 631 | The current sysfs layout features a unified device tree at |
| 632 | /sys/devices/, which is able to express a hierarchy between |
| 633 | class devices. If the deprecated option is set to Y, the |
| 634 | unified device tree is split into a bus device tree at |
| 635 | /sys/devices/ and several individual class device trees at |
| 636 | /sys/class/. The class and bus devices will be connected by |
| 637 | "<subsystem>:<name>" and the "device" links. The "block" |
| 638 | class devices, will not show up in /sys/class/block/. Some |
| 639 | subsystems will suppress the creation of some devices which |
| 640 | depend on the unified device tree. |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 641 | |
Kay Sievers | fce3e80 | 2008-11-01 14:03:00 +0100 | [diff] [blame] | 642 | This option is not a pure compatibility option that can |
| 643 | be safely enabled on newer distributions. It will change the |
| 644 | layout of sysfs to the non-extensible deprecated version, |
| 645 | and disable some features, which can not be exported without |
| 646 | confusing older userspace tools. Since 2007/2008 all major |
| 647 | distributions do not enable this option, and ship no tools which |
| 648 | depend on the deprecated layout or this option. |
| 649 | |
| 650 | If you are using a new kernel on an older distribution, or use |
| 651 | older userspace tools, you might need to say Y here. Do not say Y, |
| 652 | if the original kernel, that came with your distribution, has |
| 653 | this option set to N. |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 654 | |
Jens Axboe | b86ff981 | 2006-03-23 19:56:55 +0100 | [diff] [blame] | 655 | config RELAY |
| 656 | bool "Kernel->user space relay support (formerly relayfs)" |
| 657 | help |
| 658 | This option enables support for relay interface support in |
| 659 | certain file systems (such as debugfs). |
| 660 | It is designed to provide an efficient mechanism for tools and |
| 661 | facilities to relay large amounts of data from kernel space to |
| 662 | user space. |
| 663 | |
| 664 | If unsure, say N. |
| 665 | |
Pavel Emelyanov | c5289a6 | 2008-02-08 04:18:19 -0800 | [diff] [blame] | 666 | config NAMESPACES |
| 667 | bool "Namespaces support" if EMBEDDED |
| 668 | default !EMBEDDED |
| 669 | help |
| 670 | Provides the way to make tasks work with different objects using |
| 671 | the same id. For example same IPC id may refer to different objects |
| 672 | or same user id or pid may refer to different tasks when used in |
| 673 | different namespaces. |
| 674 | |
Pavel Emelyanov | 58bfdd6d | 2008-02-08 04:18:21 -0800 | [diff] [blame] | 675 | config UTS_NS |
| 676 | bool "UTS namespace" |
| 677 | depends on NAMESPACES |
| 678 | help |
| 679 | In this namespace tasks see different info provided with the |
| 680 | uname() system call |
| 681 | |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 682 | config IPC_NS |
| 683 | bool "IPC namespace" |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 684 | depends on NAMESPACES && (SYSVIPC || POSIX_MQUEUE) |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 685 | help |
| 686 | In this namespace tasks work with IPC ids which correspond to |
Serge E. Hallyn | 614b84c | 2009-04-06 19:01:08 -0700 | [diff] [blame] | 687 | different IPC objects in different namespaces. |
Pavel Emelyanov | ae5e1b2 | 2008-02-08 04:18:22 -0800 | [diff] [blame] | 688 | |
Pavel Emelyanov | aee16ce | 2008-02-08 04:18:23 -0800 | [diff] [blame] | 689 | config USER_NS |
| 690 | bool "User namespace (EXPERIMENTAL)" |
| 691 | depends on NAMESPACES && EXPERIMENTAL |
| 692 | help |
| 693 | This allows containers, i.e. vservers, to use user namespaces |
| 694 | to provide different user info for different servers. |
| 695 | If unsure, say N. |
| 696 | |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 697 | config PID_NS |
| 698 | bool "PID Namespaces (EXPERIMENTAL)" |
| 699 | default n |
| 700 | depends on NAMESPACES && EXPERIMENTAL |
| 701 | help |
Heikki Orsila | 12d2b8f | 2008-07-06 15:48:02 +0300 | [diff] [blame] | 702 | Support process id namespaces. This allows having multiple |
Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 703 | processes with the same pid as long as they are in different |
Pavel Emelyanov | 74bd59b | 2008-02-08 04:18:24 -0800 | [diff] [blame] | 704 | pid namespaces. This is a building block of containers. |
| 705 | |
| 706 | Unless you want to work with an experimental feature |
| 707 | say N here. |
| 708 | |
Matt Helsley | d6eb633 | 2009-01-26 12:25:55 -0800 | [diff] [blame] | 709 | config NET_NS |
| 710 | bool "Network namespace" |
| 711 | default n |
| 712 | depends on NAMESPACES && EXPERIMENTAL && NET |
| 713 | help |
| 714 | Allow user space to create what appear to be multiple instances |
| 715 | of the network stack. |
| 716 | |
Dimitri Gorokhovik | f991633 | 2007-03-06 01:42:17 -0800 | [diff] [blame] | 717 | config BLK_DEV_INITRD |
| 718 | bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" |
| 719 | depends on BROKEN || !FRV |
| 720 | help |
| 721 | The initial RAM filesystem is a ramfs which is loaded by the |
| 722 | boot loader (loadlin or lilo) and that is mounted as root |
| 723 | before the normal boot procedure. It is typically used to |
| 724 | load modules needed to mount the "real" root file system, |
| 725 | etc. See <file:Documentation/initrd.txt> for details. |
| 726 | |
| 727 | If RAM disk support (BLK_DEV_RAM) is also included, this |
| 728 | also enables initial RAM disk (initrd) support and adds |
| 729 | 15 Kbytes (more on some other architectures) to the kernel size. |
| 730 | |
| 731 | If unsure say Y. |
| 732 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 733 | if BLK_DEV_INITRD |
| 734 | |
Sam Ravnborg | dbec486 | 2005-08-10 20:44:50 +0200 | [diff] [blame] | 735 | source "usr/Kconfig" |
| 736 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 737 | endif |
| 738 | |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 739 | config CC_OPTIMIZE_FOR_SIZE |
Ingo Molnar | 96fffeb | 2008-04-28 01:39:43 +0200 | [diff] [blame] | 740 | bool "Optimize for size" |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 741 | default y |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 742 | help |
| 743 | Enabling this option will pass "-Os" instead of "-O2" to gcc |
| 744 | resulting in a smaller kernel. |
| 745 | |
jkacur | 775a722 | 2008-07-16 00:31:16 +0200 | [diff] [blame] | 746 | If unsure, say Y. |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 747 | |
Randy Dunlap | 0847062 | 2006-09-30 23:28:13 -0700 | [diff] [blame] | 748 | config SYSCTL |
| 749 | bool |
| 750 | |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 751 | config ANON_INODES |
| 752 | bool |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | menuconfig EMBEDDED |
| 755 | bool "Configure standard kernel features (for small systems)" |
| 756 | help |
| 757 | This option allows certain base kernel options and settings |
| 758 | to be disabled or tweaked. This is for specialized |
| 759 | environments which can tolerate a "non-standard" kernel. |
| 760 | Only use this if you really know what you are doing. |
| 761 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 762 | config UID16 |
| 763 | bool "Enable 16-bit UID system calls" if EMBEDDED |
David S. Miller | 09337f5 | 2008-04-26 03:17:12 -0700 | [diff] [blame] | 764 | 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] | 765 | default y |
| 766 | help |
| 767 | This enables the legacy 16-bit UID syscall wrappers. |
| 768 | |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 769 | config SYSCTL_SYSCALL |
Randy Dunlap | 0847062 | 2006-09-30 23:28:13 -0700 | [diff] [blame] | 770 | bool "Sysctl syscall support" if EMBEDDED |
Eric W. Biederman | 26a7034 | 2009-11-05 05:26:41 -0800 | [diff] [blame] | 771 | depends on PROC_SYSCTL |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 772 | default y |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 773 | select SYSCTL |
| 774 | ---help--- |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 775 | sys_sysctl uses binary paths that have been found challenging |
| 776 | to properly maintain and use. The interface in /proc/sys |
| 777 | using paths with ascii names is now the primary path to this |
| 778 | information. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 779 | |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 780 | Almost nothing using the binary sysctl interface so if you are |
| 781 | trying to save some space it is probably safe to disable this, |
| 782 | making your kernel marginally smaller. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 783 | |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 784 | If unsure say Y here. |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | config KALLSYMS |
Jesper Juhl | 979c6a1 | 2006-12-12 19:25:11 +0100 | [diff] [blame] | 787 | bool "Load all symbols for debugging/ksymoops" if EMBEDDED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | default y |
| 789 | help |
| 790 | Say Y here to let the kernel print out symbolic crash information and |
| 791 | symbolic stack backtraces. This increases the size of the kernel |
| 792 | somewhat, as all symbols have to be loaded into the kernel image. |
| 793 | |
| 794 | config KALLSYMS_ALL |
| 795 | bool "Include all symbols in kallsyms" |
| 796 | depends on DEBUG_KERNEL && KALLSYMS |
| 797 | help |
| 798 | Normally kallsyms only contains the symbols of functions, for nicer |
| 799 | OOPS messages. Some debuggers can use kallsyms for other |
Jesper Juhl | f9f97bc | 2005-07-20 05:43:05 +0200 | [diff] [blame] | 800 | symbols too: say Y here to include all symbols, if you need them |
| 801 | and you don't care about adding 300k to the size of your kernel. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
| 803 | Say N. |
| 804 | |
| 805 | config KALLSYMS_EXTRA_PASS |
| 806 | bool "Do an extra kallsyms pass" |
| 807 | depends on KALLSYMS |
| 808 | help |
| 809 | If kallsyms is not working correctly, the build will fail with |
| 810 | inconsistent kallsyms data. If that occurs, log a bug report and |
| 811 | turn on KALLSYMS_EXTRA_PASS which should result in a stable build. |
| 812 | Always say N here unless you find a bug in kallsyms, which must be |
| 813 | reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while |
| 814 | you wait for kallsyms to be fixed. |
| 815 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 816 | |
Greg Kroah-Hartman | 712f47c | 2005-11-16 11:27:07 -0800 | [diff] [blame] | 817 | config HOTPLUG |
| 818 | bool "Support for hot-pluggable devices" if EMBEDDED |
| 819 | default y |
| 820 | help |
| 821 | This option is provided for the case where no hotplug or uevent |
| 822 | capabilities is wanted by the kernel. You should only consider |
| 823 | disabling this option for embedded systems that do not use modules, a |
| 824 | dynamic /dev tree, or dynamic device discovery. Just say Y. |
| 825 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 826 | config PRINTK |
| 827 | default y |
| 828 | bool "Enable support for printk" if EMBEDDED |
| 829 | help |
| 830 | This option enables normal printk support. Removing it |
| 831 | eliminates most of the message strings from the kernel image |
| 832 | and makes the kernel more or less silent. As this makes it |
| 833 | very difficult to diagnose system problems, saying N here is |
| 834 | strongly discouraged. |
| 835 | |
Matt Mackall | c8538a7 | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 836 | config BUG |
| 837 | bool "BUG() support" if EMBEDDED |
| 838 | default y |
| 839 | help |
| 840 | Disabling this option eliminates support for BUG and WARN, reducing |
| 841 | the size of your kernel image and potentially quietly ignoring |
| 842 | numerous fatal conditions. You should only consider disabling this |
| 843 | option for embedded systems with no facilities for reporting errors. |
| 844 | Just say Y. |
| 845 | |
Matt Mackall | 708e9a7 | 2006-01-08 01:05:25 -0800 | [diff] [blame] | 846 | config ELF_CORE |
| 847 | default y |
| 848 | bool "Enable ELF core dumps" if EMBEDDED |
| 849 | help |
| 850 | Enable support for generating core dumps. Disabling saves about 4k. |
| 851 | |
Stas Sergeev | e5e1d3c | 2008-05-07 12:39:56 +0200 | [diff] [blame] | 852 | config PCSPKR_PLATFORM |
| 853 | bool "Enable PC-Speaker support" if EMBEDDED |
| 854 | depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES |
| 855 | default y |
| 856 | help |
| 857 | This option allows to disable the internal PC-Speaker |
| 858 | support, saving some memory. |
| 859 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | config BASE_FULL |
| 861 | default y |
| 862 | bool "Enable full-sized data structures for core" if EMBEDDED |
| 863 | help |
| 864 | Disabling this option reduces the size of miscellaneous core |
| 865 | kernel data structures. This saves memory on small machines, |
| 866 | but may reduce performance. |
| 867 | |
| 868 | config FUTEX |
| 869 | bool "Enable futex support" if EMBEDDED |
| 870 | default y |
Ingo Molnar | 23f78d4a | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 871 | select RT_MUTEXES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | help |
| 873 | Disabling this option will cause the kernel to be built without |
| 874 | support for "fast userspace mutexes". The resulting kernel may not |
| 875 | run glibc-based applications correctly. |
| 876 | |
| 877 | config EPOLL |
| 878 | bool "Enable eventpoll support" if EMBEDDED |
| 879 | default y |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 880 | select ANON_INODES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | help |
| 882 | Disabling this option will cause the kernel to be built without |
| 883 | support for epoll family of system calls. |
| 884 | |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 885 | config SIGNALFD |
| 886 | bool "Enable signalfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 887 | select ANON_INODES |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 888 | default y |
| 889 | help |
| 890 | Enable the signalfd() system call that allows to receive signals |
| 891 | on a file descriptor. |
| 892 | |
| 893 | If unsure, say Y. |
| 894 | |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 895 | config TIMERFD |
| 896 | bool "Enable timerfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 897 | select ANON_INODES |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 898 | default y |
| 899 | help |
| 900 | Enable the timerfd() system call that allows to receive timer |
| 901 | events on a file descriptor. |
| 902 | |
| 903 | If unsure, say Y. |
| 904 | |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 905 | config EVENTFD |
| 906 | bool "Enable eventfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 907 | select ANON_INODES |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 908 | default y |
| 909 | help |
| 910 | Enable the eventfd() system call that allows to receive both |
| 911 | kernel notification (ie. KAIO) or userspace notifications. |
| 912 | |
| 913 | If unsure, say Y. |
| 914 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | config SHMEM |
| 916 | bool "Use full shmem filesystem" if EMBEDDED |
| 917 | default y |
| 918 | depends on MMU |
| 919 | help |
| 920 | The shmem is an internal filesystem used to manage shared memory. |
| 921 | It is backed by swap and manages resource limits. It is also exported |
| 922 | to userspace as tmpfs if TMPFS is enabled. Disabling this |
| 923 | option replaces shmem and tmpfs with the much simpler ramfs code, |
| 924 | which may be appropriate on small systems without swap. |
| 925 | |
Thomas Petazzoni | ebf3f09 | 2008-10-15 22:05:12 -0700 | [diff] [blame] | 926 | config AIO |
| 927 | bool "Enable AIO support" if EMBEDDED |
| 928 | default y |
| 929 | help |
| 930 | This option enables POSIX asynchronous I/O which may by used |
| 931 | by some high performance threaded applications. Disabling |
| 932 | this option saves about 7k. |
| 933 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 934 | config HAVE_PERF_EVENTS |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 935 | bool |
Mike Frysinger | 018df72 | 2009-06-12 13:17:43 -0400 | [diff] [blame] | 936 | help |
| 937 | See tools/perf/design.txt for details. |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 938 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 939 | config PERF_USE_VMALLOC |
| 940 | bool |
| 941 | help |
| 942 | See tools/perf/design.txt for details |
| 943 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 944 | menu "Kernel Performance Events And Counters" |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 945 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 946 | config PERF_EVENTS |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 947 | bool "Kernel performance events and counters" |
| 948 | default y if (PROFILING || PERF_COUNTERS) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 949 | depends on HAVE_PERF_EVENTS |
Ingo Molnar | 4c59e46 | 2008-12-08 19:38:33 +0100 | [diff] [blame] | 950 | select ANON_INODES |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 951 | help |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 952 | Enable kernel support for various performance events provided |
| 953 | by software and hardware. |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 954 | |
Thadeu Lima de Souza Cascardo | dd77038 | 2009-10-30 19:32:25 -0200 | [diff] [blame] | 955 | Software events are supported either built-in or via the |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 956 | use of generic tracepoints. |
| 957 | |
| 958 | Most modern CPUs support performance events via performance |
| 959 | counter registers. These registers count the number of certain |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 960 | types of hw events: such as instructions executed, cachemisses |
| 961 | suffered, or branches mis-predicted - without slowing down the |
| 962 | kernel or applications. These registers can also trigger interrupts |
| 963 | when a threshold number of events have passed - and can thus be |
| 964 | used to profile the code that runs on that CPU. |
| 965 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 966 | The Linux Performance Event subsystem provides an abstraction of |
Thadeu Lima de Souza Cascardo | dd77038 | 2009-10-30 19:32:25 -0200 | [diff] [blame] | 967 | these software and hardware event capabilities, available via a |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 968 | system call and used by the "perf" utility in tools/perf/. It |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 969 | provides per task and per CPU counters, and it provides event |
| 970 | capabilities on top of those. |
| 971 | |
| 972 | Say Y if unsure. |
| 973 | |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 974 | config PERF_COUNTERS |
| 975 | bool "Kernel performance counters (old config option)" |
| 976 | depends on HAVE_PERF_EVENTS |
| 977 | help |
| 978 | This config has been obsoleted by the PERF_EVENTS |
| 979 | config option - please see that one for details. |
| 980 | |
| 981 | It has no effect on the kernel whether you enable |
| 982 | it or not, it is a compatibility placeholder. |
| 983 | |
| 984 | Say N if unsure. |
| 985 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 986 | config DEBUG_PERF_USE_VMALLOC |
| 987 | default n |
| 988 | bool "Debug: use vmalloc to back perf mmap() buffers" |
| 989 | depends on PERF_EVENTS && DEBUG_KERNEL |
| 990 | select PERF_USE_VMALLOC |
| 991 | help |
| 992 | Use vmalloc memory to back perf mmap() buffers. |
| 993 | |
| 994 | Mostly useful for debugging the vmalloc code on platforms |
| 995 | that don't require it. |
| 996 | |
| 997 | Say N if unsure. |
| 998 | |
Thomas Gleixner | 0793a61 | 2008-12-04 20:12:29 +0100 | [diff] [blame] | 999 | endmenu |
| 1000 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1001 | config VM_EVENT_COUNTERS |
| 1002 | default y |
| 1003 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED |
| 1004 | help |
Paul Jackson | 2aea4fb | 2006-12-22 01:06:10 -0800 | [diff] [blame] | 1005 | VM event counters are needed for event counts to be shown. |
| 1006 | This option allows the disabling of the VM event counters |
| 1007 | on EMBEDDED systems. /proc/vmstat will only show page counts |
| 1008 | if VM event counters are disabled. |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1009 | |
Thomas Petazzoni | 3d13731 | 2008-08-19 10:28:24 +0200 | [diff] [blame] | 1010 | config PCI_QUIRKS |
| 1011 | default y |
Geert Uytterhoeven | 61cfc7e | 2008-10-22 08:53:25 +0200 | [diff] [blame] | 1012 | bool "Enable PCI quirk workarounds" if EMBEDDED |
| 1013 | depends on PCI |
Thomas Petazzoni | 3d13731 | 2008-08-19 10:28:24 +0200 | [diff] [blame] | 1014 | help |
| 1015 | This enables workarounds for various PCI chipset |
| 1016 | bugs/quirks. Disable this only if your target machine is |
| 1017 | unaffected by PCI quirks. |
| 1018 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1019 | config SLUB_DEBUG |
| 1020 | default y |
| 1021 | bool "Enable SLUB debugging support" if EMBEDDED |
Christoph Lameter | f6acb63 | 2008-04-29 16:16:06 -0700 | [diff] [blame] | 1022 | depends on SLUB && SYSFS |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1023 | help |
| 1024 | SLUB has extensive debug support features. Disabling these can |
| 1025 | result in significant savings in code size. This also disables |
| 1026 | SLUB sysfs support. /sys/slab will not exist and there will be |
| 1027 | no support for cache validation etc. |
| 1028 | |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 1029 | config COMPAT_BRK |
| 1030 | bool "Disable heap randomization" |
| 1031 | default y |
| 1032 | help |
| 1033 | Randomizing heap placement makes heap exploits harder, but it |
| 1034 | also breaks ancient binaries (including anything libc5 based). |
| 1035 | This option changes the bootup default to heap randomization |
Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 1036 | disabled, and can be overridden at runtime by setting |
Randy Dunlap | b943c46 | 2009-03-10 12:55:46 -0700 | [diff] [blame] | 1037 | /proc/sys/kernel/randomize_va_space to 2. |
| 1038 | |
| 1039 | On non-ancient distros (post-2000 ones) N is usually a safe choice. |
| 1040 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1041 | choice |
| 1042 | prompt "Choose SLAB allocator" |
Christoph Lameter | a0acd82 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 1043 | default SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1044 | help |
| 1045 | This option allows to select a slab allocator. |
| 1046 | |
| 1047 | config SLAB |
| 1048 | bool "SLAB" |
| 1049 | help |
| 1050 | The regular slab allocator that is established and known to work |
Christoph Lameter | 3401388 | 2007-05-09 02:32:47 -0700 | [diff] [blame] | 1051 | well in all environments. It organizes cache hot objects in |
Simon Arlott | 02f5621 | 2008-11-05 22:18:19 +0000 | [diff] [blame] | 1052 | per cpu and per node queues. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1053 | |
| 1054 | config SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1055 | bool "SLUB (Unqueued Allocator)" |
| 1056 | help |
| 1057 | SLUB is a slab allocator that minimizes cache line usage |
| 1058 | instead of managing queues of cached objects (SLAB approach). |
| 1059 | Per cpu caching is realized using slabs of objects instead |
| 1060 | of queues of objects. SLUB can use memory efficiently |
Simon Arlott | 02f5621 | 2008-11-05 22:18:19 +0000 | [diff] [blame] | 1061 | and has enhanced diagnostics. SLUB is the default choice for |
| 1062 | a slab allocator. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1063 | |
| 1064 | config SLOB |
Paul Mundt | 84a01c2 | 2007-07-15 23:38:24 -0700 | [diff] [blame] | 1065 | depends on EMBEDDED |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1066 | bool "SLOB (Simple Allocator)" |
| 1067 | help |
Matt Mackall | 3729145 | 2008-02-04 22:29:38 -0800 | [diff] [blame] | 1068 | SLOB replaces the stock allocator with a drastically simpler |
| 1069 | allocator. SLOB is generally more space efficient but |
| 1070 | does not perform as well on large systems. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1071 | |
| 1072 | endchoice |
| 1073 | |
Jie Zhang | ea63763 | 2009-12-14 18:00:02 -0800 | [diff] [blame] | 1074 | config MMAP_ALLOW_UNINITIALIZED |
| 1075 | bool "Allow mmapped anonymous memory to be uninitialized" |
| 1076 | depends on EMBEDDED && !MMU |
| 1077 | default n |
| 1078 | help |
| 1079 | Normally, and according to the Linux spec, anonymous memory obtained |
| 1080 | from mmap() has it's contents cleared before it is passed to |
| 1081 | userspace. Enabling this config option allows you to request that |
| 1082 | mmap() skip that if it is given an MAP_UNINITIALIZED flag, thus |
| 1083 | providing a huge performance boost. If this option is not enabled, |
| 1084 | then the flag will be ignored. |
| 1085 | |
| 1086 | This is taken advantage of by uClibc's malloc(), and also by |
| 1087 | ELF-FDPIC binfmt's brk and stack allocator. |
| 1088 | |
| 1089 | Because of the obvious security issues, this option should only be |
| 1090 | enabled on embedded devices where you control what is run in |
| 1091 | userspace. Since that isn't generally a problem on no-MMU systems, |
| 1092 | it is normally safe to say Y here. |
| 1093 | |
| 1094 | See Documentation/nommu-mmap.txt for more information. |
| 1095 | |
Mathieu Desnoyers | 125e564 | 2008-02-02 15:10:36 -0500 | [diff] [blame] | 1096 | config PROFILING |
Robert Richter | b309a29 | 2010-02-26 15:01:23 +0100 | [diff] [blame] | 1097 | bool "Profiling support" |
Mathieu Desnoyers | 125e564 | 2008-02-02 15:10:36 -0500 | [diff] [blame] | 1098 | help |
| 1099 | Say Y here to enable the extended profiling support mechanisms used |
| 1100 | by profilers such as OProfile. |
| 1101 | |
Ingo Molnar | 5f87f11 | 2008-07-23 14:15:22 +0200 | [diff] [blame] | 1102 | # |
| 1103 | # Place an empty function call at each tracepoint site. Can be |
| 1104 | # dynamically changed for a probe function. |
| 1105 | # |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 1106 | config TRACEPOINTS |
Ingo Molnar | 5f87f11 | 2008-07-23 14:15:22 +0200 | [diff] [blame] | 1107 | bool |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 1108 | |
Mathieu Desnoyers | fb32e03 | 2008-02-02 15:10:33 -0500 | [diff] [blame] | 1109 | source "arch/Kconfig" |
| 1110 | |
David Howells | 07fe7cb | 2009-04-03 16:42:35 +0100 | [diff] [blame] | 1111 | config SLOW_WORK |
| 1112 | default n |
David Howells | 1c2d008 | 2009-04-06 15:47:25 +0100 | [diff] [blame] | 1113 | bool |
David Howells | 07fe7cb | 2009-04-03 16:42:35 +0100 | [diff] [blame] | 1114 | help |
| 1115 | The slow work thread pool provides a number of dynamically allocated |
| 1116 | threads that can be used by the kernel to perform operations that |
| 1117 | take a relatively long time. |
| 1118 | |
| 1119 | An example of this would be CacheFiles doing a path lookup followed |
| 1120 | by a series of mkdirs and a create call, all of which have to touch |
| 1121 | disk. |
| 1122 | |
David Howells | 1c2d008 | 2009-04-06 15:47:25 +0100 | [diff] [blame] | 1123 | See Documentation/slow-work.txt. |
| 1124 | |
David Howells | f13a48b | 2009-12-01 15:36:11 +0000 | [diff] [blame] | 1125 | config SLOW_WORK_DEBUG |
| 1126 | bool "Slow work debugging through debugfs" |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 1127 | default n |
David Howells | f13a48b | 2009-12-01 15:36:11 +0000 | [diff] [blame] | 1128 | depends on SLOW_WORK && DEBUG_FS |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 1129 | help |
David Howells | f13a48b | 2009-12-01 15:36:11 +0000 | [diff] [blame] | 1130 | Display the contents of the slow work run queue through debugfs, |
David Howells | 8fba10a | 2009-11-19 18:10:51 +0000 | [diff] [blame] | 1131 | including items currently executing. |
| 1132 | |
| 1133 | See Documentation/slow-work.txt. |
| 1134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | endmenu # General setup |
| 1136 | |
Dmitry Baryshkov | ee7e551 | 2008-06-29 14:18:46 +0400 | [diff] [blame] | 1137 | config HAVE_GENERIC_DMA_COHERENT |
| 1138 | bool |
| 1139 | default n |
| 1140 | |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 1141 | config SLABINFO |
| 1142 | bool |
| 1143 | depends on PROC_FS |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1144 | depends on SLAB || SLUB_DEBUG |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 1145 | default y |
| 1146 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 1147 | config RT_MUTEXES |
| 1148 | boolean |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 1149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | config BASE_SMALL |
| 1151 | int |
| 1152 | default 0 if BASE_FULL |
| 1153 | default 1 if !BASE_FULL |
| 1154 | |
Jan Engelhardt | 66da573 | 2007-07-15 23:39:29 -0700 | [diff] [blame] | 1155 | menuconfig MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | bool "Enable loadable module support" |
| 1157 | help |
| 1158 | Kernel modules are small pieces of compiled code which can |
| 1159 | be inserted in the running kernel, rather than being |
| 1160 | permanently built into the kernel. You use the "modprobe" |
| 1161 | tool to add (and sometimes remove) them. If you say Y here, |
| 1162 | many parts of the kernel can be built as modules (by |
| 1163 | answering M instead of Y where indicated): this is most |
| 1164 | useful for infrequently used options which are not required |
| 1165 | for booting. For more information, see the man pages for |
| 1166 | modprobe, lsmod, modinfo, insmod and rmmod. |
| 1167 | |
| 1168 | If you say Y here, you will need to run "make |
| 1169 | modules_install" to put the modules under /lib/modules/ |
| 1170 | where modprobe can find them (you may need to be root to do |
| 1171 | this). |
| 1172 | |
| 1173 | If unsure, say Y. |
| 1174 | |
Robert P. J. Day | 0b0de14 | 2008-08-04 13:31:32 -0400 | [diff] [blame] | 1175 | if MODULES |
| 1176 | |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1177 | config MODULE_FORCE_LOAD |
| 1178 | bool "Forced module loading" |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1179 | default n |
| 1180 | help |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1181 | Allow loading of modules without version information (ie. modprobe |
| 1182 | --force). Forced module loading sets the 'F' (forced) taint flag and |
| 1183 | is usually a really bad idea. |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | config MODULE_UNLOAD |
| 1186 | bool "Module unloading" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | help |
| 1188 | Without this option you will not be able to unload any |
| 1189 | modules (note that some modules may not be unloadable |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 1190 | anyway), which makes your kernel smaller, faster |
| 1191 | and simpler. If unsure, say Y. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | |
| 1193 | config MODULE_FORCE_UNLOAD |
| 1194 | bool "Forced module unloading" |
| 1195 | depends on MODULE_UNLOAD && EXPERIMENTAL |
| 1196 | help |
| 1197 | This option allows you to force a module to unload, even if the |
| 1198 | kernel believes it is unsafe: the kernel will remove the module |
| 1199 | without waiting for anyone to stop using it (using the -f option to |
| 1200 | rmmod). This is mainly for kernel developers and desperate users. |
| 1201 | If unsure, say N. |
| 1202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | config MODVERSIONS |
Sam Ravnborg | 0d54164 | 2005-12-26 23:04:02 +0100 | [diff] [blame] | 1204 | bool "Module versioning support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | help |
| 1206 | Usually, you have to use modules compiled with your kernel. |
| 1207 | Saying Y here makes it sometimes possible to use modules |
| 1208 | compiled for different kernels, by adding enough information |
| 1209 | to the modules to (hopefully) spot any changes which would |
| 1210 | make them incompatible with the kernel you are running. If |
| 1211 | unsure, say N. |
| 1212 | |
| 1213 | config MODULE_SRCVERSION_ALL |
| 1214 | bool "Source checksum for all modules" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | help |
| 1216 | Modules which contain a MODULE_VERSION get an extra "srcversion" |
| 1217 | field inserted into their modinfo section, which contains a |
| 1218 | sum of the source files which made it. This helps maintainers |
| 1219 | see exactly which source was used to build a module (since |
| 1220 | others sometimes change the module source without updating |
| 1221 | the version). With this option, such a "srcversion" field |
| 1222 | will be created for all modules. If unsure, say N. |
| 1223 | |
Robert P. J. Day | 0b0de14 | 2008-08-04 13:31:32 -0400 | [diff] [blame] | 1224 | endif # MODULES |
| 1225 | |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 1226 | config INIT_ALL_POSSIBLE |
| 1227 | bool |
| 1228 | help |
| 1229 | Back when each arch used to define their own cpu_online_map and |
| 1230 | cpu_possible_map, some of them chose to initialize cpu_possible_map |
| 1231 | with all 1s, and others with all 0s. When they were centralised, |
| 1232 | 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] | 1233 | and have several arch maintainers pursuing me down dark alleys. |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 1234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | config STOP_MACHINE |
| 1236 | bool |
| 1237 | default y |
| 1238 | depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU |
| 1239 | help |
| 1240 | Need stop_machine() primitive. |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 1241 | |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 1242 | source "block/Kconfig" |
Avi Kivity | e98c320 | 2007-10-16 23:27:31 -0700 | [diff] [blame] | 1243 | |
| 1244 | config PREEMPT_NOTIFIERS |
| 1245 | bool |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 1246 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1247 | config PADATA |
| 1248 | depends on SMP |
| 1249 | bool |
| 1250 | |
Thomas Gleixner | 6beb000 | 2009-11-09 15:21:34 +0000 | [diff] [blame] | 1251 | source "kernel/Kconfig.locks" |