Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | |
| 2 | config PRINTK_TIME |
| 3 | bool "Show timing information on printks" |
Randy Dunlap | d3b8b6e | 2006-12-06 20:36:38 -0800 | [diff] [blame] | 4 | depends on PRINTK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | help |
| 6 | Selecting this option causes timing information to be |
| 7 | included in printk output. This allows you to measure |
| 8 | the interval between kernel operations, including bootup |
| 9 | operations. This is useful for identifying long delays |
| 10 | in kernel startup. |
| 11 | |
Jeff Garzik | de48844 | 2007-10-25 04:06:13 -0400 | [diff] [blame] | 12 | config ENABLE_WARN_DEPRECATED |
| 13 | bool "Enable __deprecated logic" |
| 14 | default y |
| 15 | help |
| 16 | Enable the __deprecated logic in the kernel build. |
| 17 | Disable this to suppress the "warning: 'foo' is deprecated |
| 18 | (declared at kernel/power/somefile.c:1234)" messages. |
| 19 | |
Andrew Morton | cebc04b | 2006-08-14 22:43:18 -0700 | [diff] [blame] | 20 | config ENABLE_MUST_CHECK |
| 21 | bool "Enable __must_check logic" |
| 22 | default y |
| 23 | help |
| 24 | Enable the __must_check logic in the kernel build. Disable this to |
| 25 | suppress the "warning: ignoring return value of 'foo', declared with |
| 26 | attribute warn_unused_result" messages. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | config MAGIC_SYSRQ |
| 29 | bool "Magic SysRq key" |
Adrian Bunk | f346f4b | 2006-01-09 20:54:51 -0800 | [diff] [blame] | 30 | depends on !UML |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | help |
| 32 | If you say Y here, you will have some control over the system even |
| 33 | if the system crashes for example during kernel debugging (e.g., you |
| 34 | will be able to flush the buffer cache to disk, reboot the system |
| 35 | immediately or dump some status information). This is accomplished |
| 36 | by pressing various keys while holding SysRq (Alt+PrintScreen). It |
| 37 | also works on a serial console (on PC hardware at least), if you |
| 38 | send a BREAK and then within 5 seconds a command keypress. The |
| 39 | keys are documented in <file:Documentation/sysrq.txt>. Don't say Y |
| 40 | unless you really know what this hack does. |
| 41 | |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 42 | config UNUSED_SYMBOLS |
| 43 | bool "Enable unused/obsolete exported symbols" |
| 44 | default y if X86 |
| 45 | help |
| 46 | Unused but exported symbols make the kernel needlessly bigger. For |
| 47 | that reason most of these unused exports will soon be removed. This |
| 48 | option is provided temporarily to provide a transition period in case |
| 49 | some external kernel module needs one of these symbols anyway. If you |
| 50 | encounter such a case in your module, consider if you are actually |
| 51 | using the right API. (rationale: since nobody in the kernel is using |
| 52 | this in a module, there is a pretty good chance it's actually the |
| 53 | wrong interface to use). If you really need the symbol, please send a |
| 54 | mail to the linux kernel mailing list mentioning the symbol and why |
| 55 | you really need it, and what the merge plan to the mainline kernel for |
| 56 | your module is. |
| 57 | |
Don Mullis | bf4735a | 2006-12-10 02:18:37 -0800 | [diff] [blame] | 58 | config DEBUG_FS |
| 59 | bool "Debug Filesystem" |
| 60 | depends on SYSFS |
| 61 | help |
| 62 | debugfs is a virtual file system that kernel developers use to put |
| 63 | debugging files into. Enable this option to be able to read and |
| 64 | write to these files. |
| 65 | |
| 66 | If unsure, say N. |
| 67 | |
| 68 | config HEADERS_CHECK |
| 69 | bool "Run 'make headers_check' when building vmlinux" |
| 70 | depends on !UML |
| 71 | help |
| 72 | This option will extract the user-visible kernel headers whenever |
| 73 | building the kernel, and will run basic sanity checks on them to |
| 74 | ensure that exported files do not attempt to include files which |
| 75 | were not exported, etc. |
| 76 | |
| 77 | If you're making modifications to header files which are |
| 78 | relevant for userspace, say 'Y', and check the headers |
| 79 | exported to $(INSTALL_HDR_PATH) (usually 'usr/include' in |
| 80 | your build tree), to make sure they're suitable. |
| 81 | |
Sam Ravnborg | 91341d4 | 2008-01-21 21:31:44 +0100 | [diff] [blame] | 82 | config DEBUG_SECTION_MISMATCH |
| 83 | bool "Enable full Section mismatch analysis" |
| 84 | default n |
| 85 | help |
| 86 | The section mismatch analysis checks if there are illegal |
| 87 | references from one section to another section. |
| 88 | Linux will during link or during runtime drop some sections |
| 89 | and any use of code/data previously in these sections will |
| 90 | most likely result in an oops. |
| 91 | In the code functions and variables are annotated with |
| 92 | __init, __devinit etc. (see full list in include/linux/init.h) |
| 93 | which result in the code/data being placed in specific sections. |
| 94 | The section mismatch anaylsis are always done after a full |
| 95 | kernel build but enabling this options will in addition |
| 96 | do the following: |
| 97 | - Add the option -fno-inline-functions-called-once to gcc |
| 98 | When inlining a function annotated __init in a non-init |
| 99 | function we would loose the section information and thus |
| 100 | the analysis would not catch the illegal reference. |
| 101 | This options tell gcc to inline less but will also |
| 102 | result in a larger kernel. |
| 103 | - Run the section mismatch analysis for each module/built-in.o |
| 104 | When we run the section mismatch analysis on vmlinux.o we |
| 105 | looses valueable information about where the mismatch was |
| 106 | introduced. |
| 107 | Running the analysis for each module/built-in.o file |
| 108 | will tell where the mismatch happens much closer to the |
| 109 | source. The drawback is that we will report the same |
| 110 | mismatch at least twice. |
Sam Ravnborg | 588ccd7 | 2008-01-24 21:12:37 +0100 | [diff] [blame] | 111 | - Enable verbose reporting from modpost to help solving |
| 112 | the section mismatches reported. |
Sam Ravnborg | 91341d4 | 2008-01-21 21:31:44 +0100 | [diff] [blame] | 113 | |
Adrian Bunk | f346f4b | 2006-01-09 20:54:51 -0800 | [diff] [blame] | 114 | config DEBUG_KERNEL |
| 115 | bool "Kernel debugging" |
| 116 | help |
| 117 | Say Y here if you are developing drivers or trying to debug and |
| 118 | identify kernel problems. |
| 119 | |
David Woodhouse | a304e1b | 2007-02-12 00:52:00 -0800 | [diff] [blame] | 120 | config DEBUG_SHIRQ |
| 121 | bool "Debug shared IRQ handlers" |
| 122 | depends on DEBUG_KERNEL && GENERIC_HARDIRQS |
| 123 | help |
| 124 | Enable this to generate a spurious interrupt as soon as a shared |
| 125 | interrupt handler is registered, and just before one is deregistered. |
| 126 | Drivers ought to be able to handle interrupts coming in at those |
| 127 | points; some don't and need to be caught. |
| 128 | |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 129 | config DETECT_SOFTLOCKUP |
| 130 | bool "Detect Soft Lockups" |
Heiko Carstens | dea20a3 | 2006-10-11 01:20:44 -0700 | [diff] [blame] | 131 | depends on DEBUG_KERNEL && !S390 |
Ingo Molnar | 8446f1d | 2005-09-06 15:16:27 -0700 | [diff] [blame] | 132 | default y |
| 133 | help |
| 134 | Say Y here to enable the kernel to detect "soft lockups", |
| 135 | which are bugs that cause the kernel to loop in kernel |
| 136 | mode for more than 10 seconds, without giving other tasks a |
| 137 | chance to run. |
| 138 | |
| 139 | When a soft-lockup is detected, the kernel will print the |
| 140 | current stack trace (which you should report), but the |
| 141 | system will stay locked up. This feature has negligible |
| 142 | overhead. |
| 143 | |
| 144 | (Note that "hard lockups" are separate type of bugs that |
| 145 | can be detected via the NMI-watchdog, on platforms that |
| 146 | support it.) |
| 147 | |
Ingo Molnar | b642b6d | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 148 | config SCHED_DEBUG |
| 149 | bool "Collect scheduler debugging info" |
| 150 | depends on DEBUG_KERNEL && PROC_FS |
| 151 | default y |
| 152 | help |
| 153 | If you say Y here, the /proc/sched_debug file will be provided |
| 154 | that can help debug the scheduler. The runtime overhead of this |
| 155 | option is minimal. |
| 156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | config SCHEDSTATS |
| 158 | bool "Collect scheduler statistics" |
| 159 | depends on DEBUG_KERNEL && PROC_FS |
| 160 | help |
| 161 | If you say Y here, additional code will be inserted into the |
| 162 | scheduler and related routines to collect statistics about |
| 163 | scheduler behavior and provide them in /proc/schedstat. These |
| 164 | stats may be useful for both tuning and debugging the scheduler |
| 165 | If you aren't debugging the scheduler or trying to tune a specific |
| 166 | application, you can say N to avoid the very slight overhead |
| 167 | this adds. |
| 168 | |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 169 | config TIMER_STATS |
| 170 | bool "Collect kernel timers statistics" |
| 171 | depends on DEBUG_KERNEL && PROC_FS |
| 172 | help |
| 173 | If you say Y here, additional code will be inserted into the |
| 174 | timer routines to collect statistics about kernel timers being |
| 175 | reprogrammed. The statistics can be read from /proc/timer_stats. |
| 176 | The statistics collection is started by writing 1 to /proc/timer_stats, |
| 177 | writing 0 stops it. This feature is useful to collect information |
Ingo Molnar | c1a834d | 2007-06-01 00:47:16 -0700 | [diff] [blame] | 178 | about timer usage patterns in kernel and userspace. This feature |
| 179 | is lightweight if enabled in the kernel config but not activated |
| 180 | (it defaults to deactivated on bootup and will only be activated |
| 181 | if some application like powertop activates it explicitly). |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | config DEBUG_SLAB |
Andrew Morton | 4a2f0ac | 2006-03-25 03:07:22 -0800 | [diff] [blame] | 184 | bool "Debug slab memory allocations" |
Ingo Molnar | 50dd26ba | 2006-01-08 01:01:42 -0800 | [diff] [blame] | 185 | depends on DEBUG_KERNEL && SLAB |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | help |
| 187 | Say Y here to have the kernel do limited verification on memory |
| 188 | allocation as well as poisoning memory on free to catch use of freed |
| 189 | memory. This can make kmalloc/kfree-intensive workloads much slower. |
| 190 | |
Al Viro | 871751e | 2006-03-25 03:06:39 -0800 | [diff] [blame] | 191 | config DEBUG_SLAB_LEAK |
| 192 | bool "Memory leak debugging" |
| 193 | depends on DEBUG_SLAB |
| 194 | |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 195 | config SLUB_DEBUG_ON |
| 196 | bool "SLUB debugging on by default" |
| 197 | depends on SLUB && SLUB_DEBUG |
| 198 | default n |
| 199 | help |
| 200 | Boot with debugging on by default. SLUB boots by default with |
| 201 | the runtime debug capabilities switched off. Enabling this is |
| 202 | equivalent to specifying the "slub_debug" parameter on boot. |
| 203 | There is no support for more fine grained debug control like |
| 204 | possible with slub_debug=xxx. SLUB debugging may be switched |
| 205 | off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying |
| 206 | "slub_debug=-". |
| 207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | config DEBUG_PREEMPT |
| 209 | bool "Debug preemptible kernel" |
Hugh Dickins | 048c8bc | 2006-11-01 05:44:54 +1100 | [diff] [blame] | 210 | depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | default y |
| 212 | help |
| 213 | If you say Y here then the kernel will use a debug variant of the |
| 214 | commonly used smp_processor_id() function and will print warnings |
| 215 | if kernel code uses it in a preemption-unsafe way. Also, the kernel |
| 216 | will detect preemption count underflows. |
| 217 | |
Ingo Molnar | e7eebaf | 2006-06-27 02:54:55 -0700 | [diff] [blame] | 218 | config DEBUG_RT_MUTEXES |
| 219 | bool "RT Mutex debugging, deadlock detection" |
Ingo Molnar | e7eebaf | 2006-06-27 02:54:55 -0700 | [diff] [blame] | 220 | depends on DEBUG_KERNEL && RT_MUTEXES |
| 221 | help |
| 222 | This allows rt mutex semantics violations and rt mutex related |
| 223 | deadlocks (lockups) to be detected and reported automatically. |
| 224 | |
| 225 | config DEBUG_PI_LIST |
| 226 | bool |
| 227 | default y |
| 228 | depends on DEBUG_RT_MUTEXES |
| 229 | |
Thomas Gleixner | 61a8712 | 2006-06-27 02:54:56 -0700 | [diff] [blame] | 230 | config RT_MUTEX_TESTER |
| 231 | bool "Built-in scriptable tester for rt-mutexes" |
Roman Zippel | a1583d3 | 2006-06-27 02:55:00 -0700 | [diff] [blame] | 232 | depends on DEBUG_KERNEL && RT_MUTEXES |
Thomas Gleixner | 61a8712 | 2006-06-27 02:54:56 -0700 | [diff] [blame] | 233 | help |
| 234 | This option enables a rt-mutex tester. |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | config DEBUG_SPINLOCK |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 237 | bool "Spinlock and rw-lock debugging: basic checks" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | depends on DEBUG_KERNEL |
| 239 | help |
| 240 | Say Y here and build SMP to catch missing spinlock initialization |
| 241 | and certain other kinds of spinlock errors commonly made. This is |
| 242 | best used in conjunction with the NMI watchdog so that spinlock |
| 243 | deadlocks are also debuggable. |
| 244 | |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 245 | config DEBUG_MUTEXES |
| 246 | bool "Mutex debugging: basic checks" |
| 247 | depends on DEBUG_KERNEL |
| 248 | help |
| 249 | This feature allows mutex semantics violations to be detected and |
| 250 | reported. |
| 251 | |
Robert P. J. Day | c761c84 | 2007-05-08 00:25:02 -0700 | [diff] [blame] | 252 | config DEBUG_SEMAPHORE |
| 253 | bool "Semaphore debugging" |
| 254 | depends on DEBUG_KERNEL |
| 255 | depends on ALPHA || FRV |
| 256 | default n |
| 257 | help |
| 258 | If you say Y here then semaphore processing will issue lots of |
| 259 | verbose debugging messages. If you suspect a semaphore problem or a |
| 260 | kernel hacker asks for this option then say Y. Otherwise say N. |
| 261 | |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 262 | config DEBUG_LOCK_ALLOC |
| 263 | bool "Lock debugging: detect incorrect freeing of live locks" |
Adrian Bunk | 517e7aa | 2006-07-14 00:24:32 -0700 | [diff] [blame] | 264 | depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 265 | select DEBUG_SPINLOCK |
| 266 | select DEBUG_MUTEXES |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 267 | select LOCKDEP |
| 268 | help |
| 269 | This feature will check whether any held lock (spinlock, rwlock, |
| 270 | mutex or rwsem) is incorrectly freed by the kernel, via any of the |
| 271 | memory-freeing routines (kfree(), kmem_cache_free(), free_pages(), |
| 272 | vfree(), etc.), whether a live lock is incorrectly reinitialized via |
| 273 | spin_lock_init()/mutex_init()/etc., or whether there is any lock |
| 274 | held during task exit. |
| 275 | |
| 276 | config PROVE_LOCKING |
| 277 | bool "Lock debugging: prove locking correctness" |
Adrian Bunk | 517e7aa | 2006-07-14 00:24:32 -0700 | [diff] [blame] | 278 | depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 279 | select LOCKDEP |
| 280 | select DEBUG_SPINLOCK |
| 281 | select DEBUG_MUTEXES |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 282 | select DEBUG_LOCK_ALLOC |
| 283 | default n |
| 284 | help |
| 285 | This feature enables the kernel to prove that all locking |
| 286 | that occurs in the kernel runtime is mathematically |
| 287 | correct: that under no circumstance could an arbitrary (and |
| 288 | not yet triggered) combination of observed locking |
| 289 | sequences (on an arbitrary number of CPUs, running an |
| 290 | arbitrary number of tasks and interrupt contexts) cause a |
| 291 | deadlock. |
| 292 | |
| 293 | In short, this feature enables the kernel to report locking |
| 294 | related deadlocks before they actually occur. |
| 295 | |
| 296 | The proof does not depend on how hard and complex a |
| 297 | deadlock scenario would be to trigger: how many |
| 298 | participant CPUs, tasks and irq-contexts would be needed |
| 299 | for it to trigger. The proof also does not depend on |
| 300 | timing: if a race and a resulting deadlock is possible |
| 301 | theoretically (no matter how unlikely the race scenario |
| 302 | is), it will be proven so and will immediately be |
| 303 | reported by the kernel (once the event is observed that |
| 304 | makes the deadlock theoretically possible). |
| 305 | |
| 306 | If a deadlock is impossible (i.e. the locking rules, as |
| 307 | observed by the kernel, are mathematically correct), the |
| 308 | kernel reports nothing. |
| 309 | |
| 310 | NOTE: this feature can also be enabled for rwlocks, mutexes |
| 311 | and rwsems - in which case all dependencies between these |
| 312 | different locking variants are observed and mapped too, and |
| 313 | the proof of observed correctness is also maintained for an |
| 314 | arbitrary combination of these separate locking variants. |
| 315 | |
| 316 | For more details, see Documentation/lockdep-design.txt. |
| 317 | |
| 318 | config LOCKDEP |
| 319 | bool |
Adrian Bunk | 517e7aa | 2006-07-14 00:24:32 -0700 | [diff] [blame] | 320 | depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 321 | select STACKTRACE |
Franck Bui-Huu | 14cf232 | 2007-04-26 00:20:15 -0700 | [diff] [blame] | 322 | select FRAME_POINTER if !X86 && !MIPS |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 323 | select KALLSYMS |
| 324 | select KALLSYMS_ALL |
| 325 | |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 326 | config LOCK_STAT |
Danny ter Haar | fdfb870 | 2007-09-24 21:24:43 -0700 | [diff] [blame] | 327 | bool "Lock usage statistics" |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 328 | depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT |
| 329 | select LOCKDEP |
| 330 | select DEBUG_SPINLOCK |
| 331 | select DEBUG_MUTEXES |
| 332 | select DEBUG_LOCK_ALLOC |
| 333 | default n |
| 334 | help |
| 335 | This feature enables tracking lock contention points |
| 336 | |
Peter Zijlstra | a560aa4 | 2007-10-07 00:24:33 -0700 | [diff] [blame] | 337 | For more details, see Documentation/lockstat.txt |
| 338 | |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 339 | config DEBUG_LOCKDEP |
| 340 | bool "Lock dependency engine debugging" |
Adrian Bunk | 517e7aa | 2006-07-14 00:24:32 -0700 | [diff] [blame] | 341 | depends on DEBUG_KERNEL && LOCKDEP |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 342 | help |
| 343 | If you say Y here, the lock dependency engine will do |
| 344 | additional runtime checks to debug itself, at the price |
| 345 | of more runtime overhead. |
| 346 | |
| 347 | config TRACE_IRQFLAGS |
Adrian Bunk | 517e7aa | 2006-07-14 00:24:32 -0700 | [diff] [blame] | 348 | depends on DEBUG_KERNEL |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 349 | bool |
| 350 | default y |
| 351 | depends on TRACE_IRQFLAGS_SUPPORT |
| 352 | depends on PROVE_LOCKING |
| 353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | config DEBUG_SPINLOCK_SLEEP |
Ingo Molnar | 4d9f34a | 2006-07-03 00:24:55 -0700 | [diff] [blame] | 355 | bool "Spinlock debugging: sleep-inside-spinlock checking" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | depends on DEBUG_KERNEL |
| 357 | help |
| 358 | If you say Y here, various routines which may sleep will become very |
| 359 | noisy if they are called with a spinlock held. |
| 360 | |
Ingo Molnar | cae2ed9 | 2006-07-03 00:24:48 -0700 | [diff] [blame] | 361 | config DEBUG_LOCKING_API_SELFTESTS |
| 362 | bool "Locking API boot-time self-tests" |
| 363 | depends on DEBUG_KERNEL |
| 364 | help |
| 365 | Say Y here if you want the kernel to run a short self-test during |
| 366 | bootup. The self-test checks whether common types of locking bugs |
| 367 | are detected by debugging mechanisms or not. (if you disable |
| 368 | lock debugging then those bugs wont be detected of course.) |
| 369 | The following locking APIs are covered: spinlocks, rwlocks, |
| 370 | mutexes and rwsems. |
| 371 | |
Ingo Molnar | 8637c09 | 2006-07-03 00:24:38 -0700 | [diff] [blame] | 372 | config STACKTRACE |
| 373 | bool |
Adrian Bunk | 517e7aa | 2006-07-14 00:24:32 -0700 | [diff] [blame] | 374 | depends on DEBUG_KERNEL |
Ingo Molnar | 8637c09 | 2006-07-03 00:24:38 -0700 | [diff] [blame] | 375 | depends on STACKTRACE_SUPPORT |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | config DEBUG_KOBJECT |
| 378 | bool "kobject debugging" |
| 379 | depends on DEBUG_KERNEL |
| 380 | help |
| 381 | If you say Y here, some extra kobject debugging messages will be sent |
| 382 | to the syslog. |
| 383 | |
| 384 | config DEBUG_HIGHMEM |
| 385 | bool "Highmem debugging" |
| 386 | depends on DEBUG_KERNEL && HIGHMEM |
| 387 | help |
| 388 | This options enables addition error checking for high memory systems. |
| 389 | Disable for production systems. |
| 390 | |
| 391 | config DEBUG_BUGVERBOSE |
| 392 | bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EMBEDDED |
Matt Mackall | c8538a7 | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 393 | depends on BUG |
Mike Frysinger | 529a73f | 2007-11-23 14:28:44 +0800 | [diff] [blame] | 394 | depends on ARM || AVR32 || M32R || M68K || SPARC32 || SPARC64 || FRV || SUPERH || GENERIC_BUG || BLACKFIN |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | default !EMBEDDED |
| 396 | help |
| 397 | Say Y here to make BUG() panics output the file name and line number |
| 398 | of the BUG call as well as the EIP and oops trace. This aids |
| 399 | debugging but costs about 70-100K of memory. |
| 400 | |
| 401 | config DEBUG_INFO |
| 402 | bool "Compile the kernel with debug info" |
| 403 | depends on DEBUG_KERNEL |
| 404 | help |
| 405 | If you say Y here the resulting kernel image will include |
| 406 | debugging info resulting in a larger kernel image. |
Andreas Dilger | b72e53f | 2007-03-27 15:21:33 -0600 | [diff] [blame] | 407 | This adds debug symbols to the kernel and modules (gcc -g), and |
| 408 | is needed if you intend to use kernel crashdump or binary object |
| 409 | tools like crash, kgdb, LKCD, gdb, etc on the kernel. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | Say Y here only if you plan to debug the kernel. |
| 411 | |
| 412 | If unsure, say N. |
| 413 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 414 | config DEBUG_VM |
| 415 | bool "Debug VM" |
| 416 | depends on DEBUG_KERNEL |
| 417 | help |
Nick Piggin | 13e7444 | 2006-01-06 00:10:58 -0800 | [diff] [blame] | 418 | Enable this to turn on extended checks in the virtual-memory system |
| 419 | that may impact performance. |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 420 | |
| 421 | If unsure, say N. |
| 422 | |
Dave Jones | 199a9af | 2006-09-29 01:59:00 -0700 | [diff] [blame] | 423 | config DEBUG_LIST |
| 424 | bool "Debug linked list manipulation" |
| 425 | depends on DEBUG_KERNEL |
| 426 | help |
| 427 | Enable this to turn on extended checks in the linked-list |
| 428 | walking routines. |
| 429 | |
| 430 | If unsure, say N. |
| 431 | |
Jens Axboe | d6ec084 | 2007-10-22 20:01:06 +0200 | [diff] [blame] | 432 | config DEBUG_SG |
| 433 | bool "Debug SG table operations" |
| 434 | depends on DEBUG_KERNEL |
| 435 | help |
| 436 | Enable this to turn on checks on scatter-gather tables. This can |
| 437 | help find problems with drivers that do not properly initialize |
| 438 | their sg tables. |
| 439 | |
| 440 | If unsure, say N. |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | config FRAME_POINTER |
| 443 | bool "Compile the kernel with frame pointers" |
Mike Frysinger | 529a73f | 2007-11-23 14:28:44 +0800 | [diff] [blame] | 444 | depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || AVR32 || SUPERH || BLACKFIN) |
Paolo 'Blaisorblade' Giarrusso | 37fce85 | 2005-05-28 15:51:59 -0700 | [diff] [blame] | 445 | default y if DEBUG_INFO && UML |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | help |
| 447 | If you say Y here the resulting kernel image will be slightly larger |
Jesper Juhl | 2a38bcc | 2005-10-30 15:02:51 -0800 | [diff] [blame] | 448 | and slower, but it might give very useful debugging information on |
| 449 | some architectures or if you use external debuggers. |
Andi Kleen | aeb3998 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 450 | If you don't debug the kernel, you can say N. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
Ingo Molnar | a9df3d0 | 2006-01-14 13:21:33 -0800 | [diff] [blame] | 452 | config FORCED_INLINING |
| 453 | bool "Force gcc to inline functions marked 'inline'" |
| 454 | depends on DEBUG_KERNEL |
| 455 | default y |
| 456 | help |
| 457 | This option determines if the kernel forces gcc to inline the functions |
| 458 | developers have marked 'inline'. Doing so takes away freedom from gcc to |
| 459 | do what it thinks is best, which is desirable for the gcc 3.x series of |
| 460 | compilers. The gcc 4.x series have a rewritten inlining algorithm and |
| 461 | disabling this option will generate a smaller kernel there. Hopefully |
| 462 | this algorithm is so good that allowing gcc4 to make the decision can |
| 463 | become the default in the future, until then this option is there to |
| 464 | test gcc for this. |
| 465 | |
Randy Dunlap | bfe8df3 | 2007-10-16 01:23:46 -0700 | [diff] [blame] | 466 | config BOOT_PRINTK_DELAY |
| 467 | bool "Delay each boot printk message by N milliseconds" |
| 468 | depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY |
| 469 | help |
| 470 | This build option allows you to read kernel boot messages |
| 471 | by inserting a short delay after each one. The delay is |
| 472 | specified in milliseconds on the kernel command line, |
| 473 | using "boot_delay=N". |
| 474 | |
| 475 | It is likely that you would also need to use "lpj=M" to preset |
| 476 | the "loops per jiffie" value. |
| 477 | See a previous boot log for the "lpj" value to use for your |
| 478 | system, and then set "lpj=M" before setting "boot_delay=N". |
| 479 | NOTE: Using this option may adversely affect SMP systems. |
| 480 | I.e., processors other than the first one may not boot up. |
| 481 | BOOT_PRINTK_DELAY also may cause DETECT_SOFTLOCKUP to detect |
| 482 | what it believes to be lockup conditions. |
| 483 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 484 | config RCU_TORTURE_TEST |
| 485 | tristate "torture tests for RCU" |
| 486 | depends on DEBUG_KERNEL |
Paul E. McKenney | 9aaffc8 | 2007-05-23 13:57:41 -0700 | [diff] [blame] | 487 | depends on m |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 488 | default n |
| 489 | help |
| 490 | This option provides a kernel module that runs torture tests |
| 491 | on the RCU infrastructure. The kernel module may be built |
| 492 | after the fact on the running kernel to be tested, if desired. |
| 493 | |
Paul E. McKenney | a241ec6 | 2005-10-30 15:03:12 -0800 | [diff] [blame] | 494 | Say M if you want the RCU torture tests to build as a module. |
| 495 | Say N if you are unsure. |
Ankita Garg | 8bb31b9 | 2006-10-02 02:17:36 -0700 | [diff] [blame] | 496 | |
| 497 | config LKDTM |
| 498 | tristate "Linux Kernel Dump Test Tool Module" |
Don Mullis | bf4735a | 2006-12-10 02:18:37 -0800 | [diff] [blame] | 499 | depends on DEBUG_KERNEL |
Ankita Garg | 8bb31b9 | 2006-10-02 02:17:36 -0700 | [diff] [blame] | 500 | depends on KPROBES |
| 501 | default n |
| 502 | help |
| 503 | This module enables testing of the different dumping mechanisms by |
| 504 | inducing system failures at predefined crash points. |
| 505 | If you don't need it: say N |
| 506 | Choose M here to compile this code as a module. The module will be |
| 507 | called lkdtm. |
| 508 | |
| 509 | Documentation on how to use the module can be found in |
| 510 | drivers/misc/lkdtm.c |
Akinobu Mita | 6ff1cb3 | 2006-12-08 02:39:43 -0800 | [diff] [blame] | 511 | |
| 512 | config FAULT_INJECTION |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 513 | bool "Fault-injection framework" |
| 514 | depends on DEBUG_KERNEL |
Akinobu Mita | 329409a | 2006-12-08 02:39:48 -0800 | [diff] [blame] | 515 | help |
| 516 | Provide fault-injection framework. |
| 517 | For more details, see Documentation/fault-injection/. |
Akinobu Mita | 6ff1cb3 | 2006-12-08 02:39:43 -0800 | [diff] [blame] | 518 | |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 519 | config FAILSLAB |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 520 | bool "Fault-injection capability for kmalloc" |
| 521 | depends on FAULT_INJECTION |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 522 | help |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 523 | Provide fault-injection capability for kmalloc. |
Akinobu Mita | 8a8b650 | 2006-12-08 02:39:44 -0800 | [diff] [blame] | 524 | |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 525 | config FAIL_PAGE_ALLOC |
| 526 | bool "Fault-injection capabilitiy for alloc_pages()" |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 527 | depends on FAULT_INJECTION |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 528 | help |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 529 | Provide fault-injection capability for alloc_pages(). |
Akinobu Mita | 933e312 | 2006-12-08 02:39:45 -0800 | [diff] [blame] | 530 | |
Akinobu Mita | c17bb49 | 2006-12-08 02:39:46 -0800 | [diff] [blame] | 531 | config FAIL_MAKE_REQUEST |
Dave Jones | 86327d1 | 2006-12-12 20:16:36 +0100 | [diff] [blame] | 532 | bool "Fault-injection capability for disk IO" |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 533 | depends on FAULT_INJECTION |
Akinobu Mita | c17bb49 | 2006-12-08 02:39:46 -0800 | [diff] [blame] | 534 | help |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 535 | Provide fault-injection capability for disk IO. |
Akinobu Mita | c17bb49 | 2006-12-08 02:39:46 -0800 | [diff] [blame] | 536 | |
Akinobu Mita | 6ff1cb3 | 2006-12-08 02:39:43 -0800 | [diff] [blame] | 537 | config FAULT_INJECTION_DEBUG_FS |
| 538 | bool "Debugfs entries for fault-injection capabilities" |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 539 | depends on FAULT_INJECTION && SYSFS && DEBUG_FS |
Akinobu Mita | 6ff1cb3 | 2006-12-08 02:39:43 -0800 | [diff] [blame] | 540 | help |
Andrew Morton | 1ab8509a | 2006-12-08 02:39:49 -0800 | [diff] [blame] | 541 | Enable configuration of fault-injection capabilities via debugfs. |
Akinobu Mita | 1df4900 | 2007-02-20 13:57:56 -0800 | [diff] [blame] | 542 | |
| 543 | config FAULT_INJECTION_STACKTRACE_FILTER |
| 544 | bool "stacktrace filter for fault-injection capabilities" |
| 545 | depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT |
Akinobu Mita | 6d690dc | 2007-05-12 10:36:53 -0700 | [diff] [blame] | 546 | depends on !X86_64 |
Akinobu Mita | 1df4900 | 2007-02-20 13:57:56 -0800 | [diff] [blame] | 547 | select STACKTRACE |
| 548 | select FRAME_POINTER |
| 549 | help |
| 550 | Provide stacktrace filter for fault-injection capabilities |
Mathieu Desnoyers | 267c402 | 2007-10-18 23:41:07 -0700 | [diff] [blame] | 551 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 552 | config LATENCYTOP |
| 553 | bool "Latency measuring infrastructure" |
| 554 | select FRAME_POINTER if !MIPS |
| 555 | select KALLSYMS |
| 556 | select KALLSYMS_ALL |
| 557 | select STACKTRACE |
| 558 | select SCHEDSTATS |
| 559 | select SCHED_DEBUG |
| 560 | depends on X86 || X86_64 |
| 561 | help |
| 562 | Enable this option if you want to use the LatencyTOP tool |
| 563 | to find out which userspace is blocking on what kernel operations. |
| 564 | |
| 565 | |
Mathieu Desnoyers | 267c402 | 2007-10-18 23:41:07 -0700 | [diff] [blame] | 566 | source "samples/Kconfig" |