Kconfig.debug 24 KB

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  1. config PRINTK_TIME
  2. bool "Show timing information on printks"
  3. depends on PRINTK
  4. help
  5. Selecting this option causes timing information to be
  6. included in printk output. This allows you to measure
  7. the interval between kernel operations, including bootup
  8. operations. This is useful for identifying long delays
  9. in kernel startup.
  10. config ENABLE_WARN_DEPRECATED
  11. bool "Enable __deprecated logic"
  12. default y
  13. help
  14. Enable the __deprecated logic in the kernel build.
  15. Disable this to suppress the "warning: 'foo' is deprecated
  16. (declared at kernel/power/somefile.c:1234)" messages.
  17. config ENABLE_MUST_CHECK
  18. bool "Enable __must_check logic"
  19. default y
  20. help
  21. Enable the __must_check logic in the kernel build. Disable this to
  22. suppress the "warning: ignoring return value of 'foo', declared with
  23. attribute warn_unused_result" messages.
  24. config FRAME_WARN
  25. int "Warn for stack frames larger than (needs gcc 4.4)"
  26. range 0 8192
  27. default 1024 if !64BIT
  28. default 2048 if 64BIT
  29. help
  30. Tell gcc to warn at build time for stack frames larger than this.
  31. Setting this too low will cause a lot of warnings.
  32. Setting it to 0 disables the warning.
  33. Requires gcc 4.4
  34. config MAGIC_SYSRQ
  35. bool "Magic SysRq key"
  36. depends on !UML
  37. help
  38. If you say Y here, you will have some control over the system even
  39. if the system crashes for example during kernel debugging (e.g., you
  40. will be able to flush the buffer cache to disk, reboot the system
  41. immediately or dump some status information). This is accomplished
  42. by pressing various keys while holding SysRq (Alt+PrintScreen). It
  43. also works on a serial console (on PC hardware at least), if you
  44. send a BREAK and then within 5 seconds a command keypress. The
  45. keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
  46. unless you really know what this hack does.
  47. config UNUSED_SYMBOLS
  48. bool "Enable unused/obsolete exported symbols"
  49. default y if X86
  50. help
  51. Unused but exported symbols make the kernel needlessly bigger. For
  52. that reason most of these unused exports will soon be removed. This
  53. option is provided temporarily to provide a transition period in case
  54. some external kernel module needs one of these symbols anyway. If you
  55. encounter such a case in your module, consider if you are actually
  56. using the right API. (rationale: since nobody in the kernel is using
  57. this in a module, there is a pretty good chance it's actually the
  58. wrong interface to use). If you really need the symbol, please send a
  59. mail to the linux kernel mailing list mentioning the symbol and why
  60. you really need it, and what the merge plan to the mainline kernel for
  61. your module is.
  62. config DEBUG_FS
  63. bool "Debug Filesystem"
  64. depends on SYSFS
  65. help
  66. debugfs is a virtual file system that kernel developers use to put
  67. debugging files into. Enable this option to be able to read and
  68. write to these files.
  69. For detailed documentation on the debugfs API, see
  70. Documentation/DocBook/filesystems.
  71. If unsure, say N.
  72. config HEADERS_CHECK
  73. bool "Run 'make headers_check' when building vmlinux"
  74. depends on !UML
  75. help
  76. This option will extract the user-visible kernel headers whenever
  77. building the kernel, and will run basic sanity checks on them to
  78. ensure that exported files do not attempt to include files which
  79. were not exported, etc.
  80. If you're making modifications to header files which are
  81. relevant for userspace, say 'Y', and check the headers
  82. exported to $(INSTALL_HDR_PATH) (usually 'usr/include' in
  83. your build tree), to make sure they're suitable.
  84. config DEBUG_SECTION_MISMATCH
  85. bool "Enable full Section mismatch analysis"
  86. depends on UNDEFINED
  87. # This option is on purpose disabled for now.
  88. # It will be enabled when we are down to a resonable number
  89. # of section mismatch warnings (< 10 for an allyesconfig build)
  90. help
  91. The section mismatch analysis checks if there are illegal
  92. references from one section to another section.
  93. Linux will during link or during runtime drop some sections
  94. and any use of code/data previously in these sections will
  95. most likely result in an oops.
  96. In the code functions and variables are annotated with
  97. __init, __devinit etc. (see full list in include/linux/init.h)
  98. which results in the code/data being placed in specific sections.
  99. The section mismatch analysis is always done after a full
  100. kernel build but enabling this option will in addition
  101. do the following:
  102. - Add the option -fno-inline-functions-called-once to gcc
  103. When inlining a function annotated __init in a non-init
  104. function we would lose the section information and thus
  105. the analysis would not catch the illegal reference.
  106. This option tells gcc to inline less but will also
  107. result in a larger kernel.
  108. - Run the section mismatch analysis for each module/built-in.o
  109. When we run the section mismatch analysis on vmlinux.o we
  110. lose valueble information about where the mismatch was
  111. introduced.
  112. Running the analysis for each module/built-in.o file
  113. will tell where the mismatch happens much closer to the
  114. source. The drawback is that we will report the same
  115. mismatch at least twice.
  116. - Enable verbose reporting from modpost to help solving
  117. the section mismatches reported.
  118. config DEBUG_KERNEL
  119. bool "Kernel debugging"
  120. help
  121. Say Y here if you are developing drivers or trying to debug and
  122. identify kernel problems.
  123. config DEBUG_SHIRQ
  124. bool "Debug shared IRQ handlers"
  125. depends on DEBUG_KERNEL && GENERIC_HARDIRQS
  126. help
  127. Enable this to generate a spurious interrupt as soon as a shared
  128. interrupt handler is registered, and just before one is deregistered.
  129. Drivers ought to be able to handle interrupts coming in at those
  130. points; some don't and need to be caught.
  131. config DETECT_SOFTLOCKUP
  132. bool "Detect Soft Lockups"
  133. depends on DEBUG_KERNEL && !S390
  134. default y
  135. help
  136. Say Y here to enable the kernel to detect "soft lockups",
  137. which are bugs that cause the kernel to loop in kernel
  138. mode for more than 10 seconds, without giving other tasks a
  139. chance to run.
  140. When a soft-lockup is detected, the kernel will print the
  141. current stack trace (which you should report), but the
  142. system will stay locked up. This feature has negligible
  143. overhead.
  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. config SCHED_DEBUG
  148. bool "Collect scheduler debugging info"
  149. depends on DEBUG_KERNEL && PROC_FS
  150. default y
  151. help
  152. If you say Y here, the /proc/sched_debug file will be provided
  153. that can help debug the scheduler. The runtime overhead of this
  154. option is minimal.
  155. config SCHEDSTATS
  156. bool "Collect scheduler statistics"
  157. depends on DEBUG_KERNEL && PROC_FS
  158. help
  159. If you say Y here, additional code will be inserted into the
  160. scheduler and related routines to collect statistics about
  161. scheduler behavior and provide them in /proc/schedstat. These
  162. stats may be useful for both tuning and debugging the scheduler
  163. If you aren't debugging the scheduler or trying to tune a specific
  164. application, you can say N to avoid the very slight overhead
  165. this adds.
  166. config TIMER_STATS
  167. bool "Collect kernel timers statistics"
  168. depends on DEBUG_KERNEL && PROC_FS
  169. help
  170. If you say Y here, additional code will be inserted into the
  171. timer routines to collect statistics about kernel timers being
  172. reprogrammed. The statistics can be read from /proc/timer_stats.
  173. The statistics collection is started by writing 1 to /proc/timer_stats,
  174. writing 0 stops it. This feature is useful to collect information
  175. about timer usage patterns in kernel and userspace. This feature
  176. is lightweight if enabled in the kernel config but not activated
  177. (it defaults to deactivated on bootup and will only be activated
  178. if some application like powertop activates it explicitly).
  179. config DEBUG_OBJECTS
  180. bool "Debug object operations"
  181. depends on DEBUG_KERNEL
  182. help
  183. If you say Y here, additional code will be inserted into the
  184. kernel to track the life time of various objects and validate
  185. the operations on those objects.
  186. config DEBUG_OBJECTS_SELFTEST
  187. bool "Debug objects selftest"
  188. depends on DEBUG_OBJECTS
  189. help
  190. This enables the selftest of the object debug code.
  191. config DEBUG_OBJECTS_FREE
  192. bool "Debug objects in freed memory"
  193. depends on DEBUG_OBJECTS
  194. help
  195. This enables checks whether a k/v free operation frees an area
  196. which contains an object which has not been deactivated
  197. properly. This can make kmalloc/kfree-intensive workloads
  198. much slower.
  199. config DEBUG_OBJECTS_TIMERS
  200. bool "Debug timer objects"
  201. depends on DEBUG_OBJECTS
  202. help
  203. If you say Y here, additional code will be inserted into the
  204. timer routines to track the life time of timer objects and
  205. validate the timer operations.
  206. config DEBUG_SLAB
  207. bool "Debug slab memory allocations"
  208. depends on DEBUG_KERNEL && SLAB
  209. help
  210. Say Y here to have the kernel do limited verification on memory
  211. allocation as well as poisoning memory on free to catch use of freed
  212. memory. This can make kmalloc/kfree-intensive workloads much slower.
  213. config DEBUG_SLAB_LEAK
  214. bool "Memory leak debugging"
  215. depends on DEBUG_SLAB
  216. config SLUB_DEBUG_ON
  217. bool "SLUB debugging on by default"
  218. depends on SLUB && SLUB_DEBUG
  219. default n
  220. help
  221. Boot with debugging on by default. SLUB boots by default with
  222. the runtime debug capabilities switched off. Enabling this is
  223. equivalent to specifying the "slub_debug" parameter on boot.
  224. There is no support for more fine grained debug control like
  225. possible with slub_debug=xxx. SLUB debugging may be switched
  226. off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
  227. "slub_debug=-".
  228. config SLUB_STATS
  229. default n
  230. bool "Enable SLUB performance statistics"
  231. depends on SLUB && SLUB_DEBUG && SYSFS
  232. help
  233. SLUB statistics are useful to debug SLUBs allocation behavior in
  234. order find ways to optimize the allocator. This should never be
  235. enabled for production use since keeping statistics slows down
  236. the allocator by a few percentage points. The slabinfo command
  237. supports the determination of the most active slabs to figure
  238. out which slabs are relevant to a particular load.
  239. Try running: slabinfo -DA
  240. config DEBUG_PREEMPT
  241. bool "Debug preemptible kernel"
  242. depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
  243. default y
  244. help
  245. If you say Y here then the kernel will use a debug variant of the
  246. commonly used smp_processor_id() function and will print warnings
  247. if kernel code uses it in a preemption-unsafe way. Also, the kernel
  248. will detect preemption count underflows.
  249. config DEBUG_RT_MUTEXES
  250. bool "RT Mutex debugging, deadlock detection"
  251. depends on DEBUG_KERNEL && RT_MUTEXES
  252. help
  253. This allows rt mutex semantics violations and rt mutex related
  254. deadlocks (lockups) to be detected and reported automatically.
  255. config DEBUG_PI_LIST
  256. bool
  257. default y
  258. depends on DEBUG_RT_MUTEXES
  259. config RT_MUTEX_TESTER
  260. bool "Built-in scriptable tester for rt-mutexes"
  261. depends on DEBUG_KERNEL && RT_MUTEXES
  262. help
  263. This option enables a rt-mutex tester.
  264. config DEBUG_SPINLOCK
  265. bool "Spinlock and rw-lock debugging: basic checks"
  266. depends on DEBUG_KERNEL
  267. help
  268. Say Y here and build SMP to catch missing spinlock initialization
  269. and certain other kinds of spinlock errors commonly made. This is
  270. best used in conjunction with the NMI watchdog so that spinlock
  271. deadlocks are also debuggable.
  272. config DEBUG_MUTEXES
  273. bool "Mutex debugging: basic checks"
  274. depends on DEBUG_KERNEL
  275. help
  276. This feature allows mutex semantics violations to be detected and
  277. reported.
  278. config DEBUG_LOCK_ALLOC
  279. bool "Lock debugging: detect incorrect freeing of live locks"
  280. depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
  281. select DEBUG_SPINLOCK
  282. select DEBUG_MUTEXES
  283. select LOCKDEP
  284. help
  285. This feature will check whether any held lock (spinlock, rwlock,
  286. mutex or rwsem) is incorrectly freed by the kernel, via any of the
  287. memory-freeing routines (kfree(), kmem_cache_free(), free_pages(),
  288. vfree(), etc.), whether a live lock is incorrectly reinitialized via
  289. spin_lock_init()/mutex_init()/etc., or whether there is any lock
  290. held during task exit.
  291. config PROVE_LOCKING
  292. bool "Lock debugging: prove locking correctness"
  293. depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
  294. select LOCKDEP
  295. select DEBUG_SPINLOCK
  296. select DEBUG_MUTEXES
  297. select DEBUG_LOCK_ALLOC
  298. default n
  299. help
  300. This feature enables the kernel to prove that all locking
  301. that occurs in the kernel runtime is mathematically
  302. correct: that under no circumstance could an arbitrary (and
  303. not yet triggered) combination of observed locking
  304. sequences (on an arbitrary number of CPUs, running an
  305. arbitrary number of tasks and interrupt contexts) cause a
  306. deadlock.
  307. In short, this feature enables the kernel to report locking
  308. related deadlocks before they actually occur.
  309. The proof does not depend on how hard and complex a
  310. deadlock scenario would be to trigger: how many
  311. participant CPUs, tasks and irq-contexts would be needed
  312. for it to trigger. The proof also does not depend on
  313. timing: if a race and a resulting deadlock is possible
  314. theoretically (no matter how unlikely the race scenario
  315. is), it will be proven so and will immediately be
  316. reported by the kernel (once the event is observed that
  317. makes the deadlock theoretically possible).
  318. If a deadlock is impossible (i.e. the locking rules, as
  319. observed by the kernel, are mathematically correct), the
  320. kernel reports nothing.
  321. NOTE: this feature can also be enabled for rwlocks, mutexes
  322. and rwsems - in which case all dependencies between these
  323. different locking variants are observed and mapped too, and
  324. the proof of observed correctness is also maintained for an
  325. arbitrary combination of these separate locking variants.
  326. For more details, see Documentation/lockdep-design.txt.
  327. config LOCKDEP
  328. bool
  329. depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
  330. select STACKTRACE
  331. select FRAME_POINTER if !X86 && !MIPS
  332. select KALLSYMS
  333. select KALLSYMS_ALL
  334. config LOCK_STAT
  335. bool "Lock usage statistics"
  336. depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
  337. select LOCKDEP
  338. select DEBUG_SPINLOCK
  339. select DEBUG_MUTEXES
  340. select DEBUG_LOCK_ALLOC
  341. default n
  342. help
  343. This feature enables tracking lock contention points
  344. For more details, see Documentation/lockstat.txt
  345. config DEBUG_LOCKDEP
  346. bool "Lock dependency engine debugging"
  347. depends on DEBUG_KERNEL && LOCKDEP
  348. help
  349. If you say Y here, the lock dependency engine will do
  350. additional runtime checks to debug itself, at the price
  351. of more runtime overhead.
  352. config TRACE_IRQFLAGS
  353. depends on DEBUG_KERNEL
  354. bool
  355. default y
  356. depends on TRACE_IRQFLAGS_SUPPORT
  357. depends on PROVE_LOCKING
  358. config DEBUG_SPINLOCK_SLEEP
  359. bool "Spinlock debugging: sleep-inside-spinlock checking"
  360. depends on DEBUG_KERNEL
  361. help
  362. If you say Y here, various routines which may sleep will become very
  363. noisy if they are called with a spinlock held.
  364. config DEBUG_LOCKING_API_SELFTESTS
  365. bool "Locking API boot-time self-tests"
  366. depends on DEBUG_KERNEL
  367. help
  368. Say Y here if you want the kernel to run a short self-test during
  369. bootup. The self-test checks whether common types of locking bugs
  370. are detected by debugging mechanisms or not. (if you disable
  371. lock debugging then those bugs wont be detected of course.)
  372. The following locking APIs are covered: spinlocks, rwlocks,
  373. mutexes and rwsems.
  374. config STACKTRACE
  375. bool
  376. depends on STACKTRACE_SUPPORT
  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. config DEBUG_HIGHMEM
  384. bool "Highmem debugging"
  385. depends on DEBUG_KERNEL && HIGHMEM
  386. help
  387. This options enables addition error checking for high memory systems.
  388. Disable for production systems.
  389. config DEBUG_BUGVERBOSE
  390. bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EMBEDDED
  391. depends on BUG
  392. depends on ARM || AVR32 || M32R || M68K || SPARC32 || SPARC64 || \
  393. FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300
  394. default !EMBEDDED
  395. help
  396. Say Y here to make BUG() panics output the file name and line number
  397. of the BUG call as well as the EIP and oops trace. This aids
  398. debugging but costs about 70-100K of memory.
  399. config DEBUG_INFO
  400. bool "Compile the kernel with debug info"
  401. depends on DEBUG_KERNEL
  402. help
  403. If you say Y here the resulting kernel image will include
  404. debugging info resulting in a larger kernel image.
  405. This adds debug symbols to the kernel and modules (gcc -g), and
  406. is needed if you intend to use kernel crashdump or binary object
  407. tools like crash, kgdb, LKCD, gdb, etc on the kernel.
  408. Say Y here only if you plan to debug the kernel.
  409. If unsure, say N.
  410. config DEBUG_VM
  411. bool "Debug VM"
  412. depends on DEBUG_KERNEL
  413. help
  414. Enable this to turn on extended checks in the virtual-memory system
  415. that may impact performance.
  416. If unsure, say N.
  417. config DEBUG_WRITECOUNT
  418. bool "Debug filesystem writers count"
  419. depends on DEBUG_KERNEL
  420. help
  421. Enable this to catch wrong use of the writers count in struct
  422. vfsmount. This will increase the size of each file struct by
  423. 32 bits.
  424. If unsure, say N.
  425. config DEBUG_LIST
  426. bool "Debug linked list manipulation"
  427. depends on DEBUG_KERNEL
  428. help
  429. Enable this to turn on extended checks in the linked-list
  430. walking routines.
  431. If unsure, say N.
  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. If unsure, say N.
  440. config FRAME_POINTER
  441. bool "Compile the kernel with frame pointers"
  442. depends on DEBUG_KERNEL && \
  443. (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
  444. AVR32 || SUPERH || BLACKFIN || MN10300)
  445. default y if DEBUG_INFO && UML
  446. help
  447. If you say Y here the resulting kernel image will be slightly larger
  448. and slower, but it might give very useful debugging information on
  449. some architectures or if you use external debuggers.
  450. If you don't debug the kernel, you can say N.
  451. config BOOT_PRINTK_DELAY
  452. bool "Delay each boot printk message by N milliseconds"
  453. depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
  454. help
  455. This build option allows you to read kernel boot messages
  456. by inserting a short delay after each one. The delay is
  457. specified in milliseconds on the kernel command line,
  458. using "boot_delay=N".
  459. It is likely that you would also need to use "lpj=M" to preset
  460. the "loops per jiffie" value.
  461. See a previous boot log for the "lpj" value to use for your
  462. system, and then set "lpj=M" before setting "boot_delay=N".
  463. NOTE: Using this option may adversely affect SMP systems.
  464. I.e., processors other than the first one may not boot up.
  465. BOOT_PRINTK_DELAY also may cause DETECT_SOFTLOCKUP to detect
  466. what it believes to be lockup conditions.
  467. config RCU_TORTURE_TEST
  468. tristate "torture tests for RCU"
  469. depends on DEBUG_KERNEL
  470. default n
  471. help
  472. This option provides a kernel module that runs torture tests
  473. on the RCU infrastructure. The kernel module may be built
  474. after the fact on the running kernel to be tested, if desired.
  475. Say Y here if you want RCU torture tests to be built into
  476. the kernel.
  477. Say M if you want the RCU torture tests to build as a module.
  478. Say N if you are unsure.
  479. config RCU_TORTURE_TEST_RUNNABLE
  480. bool "torture tests for RCU runnable by default"
  481. depends on RCU_TORTURE_TEST = y
  482. default n
  483. help
  484. This option provides a way to build the RCU torture tests
  485. directly into the kernel without them starting up at boot
  486. time. You can use /proc/sys/kernel/rcutorture_runnable
  487. to manually override this setting. This /proc file is
  488. available only when the RCU torture tests have been built
  489. into the kernel.
  490. Say Y here if you want the RCU torture tests to start during
  491. boot (you probably don't).
  492. Say N here if you want the RCU torture tests to start only
  493. after being manually enabled via /proc.
  494. config KPROBES_SANITY_TEST
  495. bool "Kprobes sanity tests"
  496. depends on DEBUG_KERNEL
  497. depends on KPROBES
  498. default n
  499. help
  500. This option provides for testing basic kprobes functionality on
  501. boot. A sample kprobe, jprobe and kretprobe are inserted and
  502. verified for functionality.
  503. Say N if you are unsure.
  504. config BACKTRACE_SELF_TEST
  505. tristate "Self test for the backtrace code"
  506. depends on DEBUG_KERNEL
  507. default n
  508. help
  509. This option provides a kernel module that can be used to test
  510. the kernel stack backtrace code. This option is not useful
  511. for distributions or general kernels, but only for kernel
  512. developers working on architecture code.
  513. Note that if you want to also test saved backtraces, you will
  514. have to enable STACKTRACE as well.
  515. Say N if you are unsure.
  516. config LKDTM
  517. tristate "Linux Kernel Dump Test Tool Module"
  518. depends on DEBUG_KERNEL
  519. depends on KPROBES
  520. depends on BLOCK
  521. default n
  522. help
  523. This module enables testing of the different dumping mechanisms by
  524. inducing system failures at predefined crash points.
  525. If you don't need it: say N
  526. Choose M here to compile this code as a module. The module will be
  527. called lkdtm.
  528. Documentation on how to use the module can be found in
  529. drivers/misc/lkdtm.c
  530. config FAULT_INJECTION
  531. bool "Fault-injection framework"
  532. depends on DEBUG_KERNEL
  533. help
  534. Provide fault-injection framework.
  535. For more details, see Documentation/fault-injection/.
  536. config FAILSLAB
  537. bool "Fault-injection capability for kmalloc"
  538. depends on FAULT_INJECTION
  539. help
  540. Provide fault-injection capability for kmalloc.
  541. config FAIL_PAGE_ALLOC
  542. bool "Fault-injection capabilitiy for alloc_pages()"
  543. depends on FAULT_INJECTION
  544. help
  545. Provide fault-injection capability for alloc_pages().
  546. config FAIL_MAKE_REQUEST
  547. bool "Fault-injection capability for disk IO"
  548. depends on FAULT_INJECTION
  549. help
  550. Provide fault-injection capability for disk IO.
  551. config FAULT_INJECTION_DEBUG_FS
  552. bool "Debugfs entries for fault-injection capabilities"
  553. depends on FAULT_INJECTION && SYSFS && DEBUG_FS
  554. help
  555. Enable configuration of fault-injection capabilities via debugfs.
  556. config FAULT_INJECTION_STACKTRACE_FILTER
  557. bool "stacktrace filter for fault-injection capabilities"
  558. depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
  559. depends on !X86_64
  560. select STACKTRACE
  561. select FRAME_POINTER
  562. help
  563. Provide stacktrace filter for fault-injection capabilities
  564. config LATENCYTOP
  565. bool "Latency measuring infrastructure"
  566. select FRAME_POINTER if !MIPS
  567. select KALLSYMS
  568. select KALLSYMS_ALL
  569. select STACKTRACE
  570. select SCHEDSTATS
  571. select SCHED_DEBUG
  572. depends on HAVE_LATENCYTOP_SUPPORT
  573. help
  574. Enable this option if you want to use the LatencyTOP tool
  575. to find out which userspace is blocking on what kernel operations.
  576. source kernel/trace/Kconfig
  577. config PROVIDE_OHCI1394_DMA_INIT
  578. bool "Remote debugging over FireWire early on boot"
  579. depends on PCI && X86
  580. help
  581. If you want to debug problems which hang or crash the kernel early
  582. on boot and the crashing machine has a FireWire port, you can use
  583. this feature to remotely access the memory of the crashed machine
  584. over FireWire. This employs remote DMA as part of the OHCI1394
  585. specification which is now the standard for FireWire controllers.
  586. With remote DMA, you can monitor the printk buffer remotely using
  587. firescope and access all memory below 4GB using fireproxy from gdb.
  588. Even controlling a kernel debugger is possible using remote DMA.
  589. Usage:
  590. If ohci1394_dma=early is used as boot parameter, it will initialize
  591. all OHCI1394 controllers which are found in the PCI config space.
  592. As all changes to the FireWire bus such as enabling and disabling
  593. devices cause a bus reset and thereby disable remote DMA for all
  594. devices, be sure to have the cable plugged and FireWire enabled on
  595. the debugging host before booting the debug target for debugging.
  596. This code (~1k) is freed after boot. By then, the firewire stack
  597. in charge of the OHCI-1394 controllers should be used instead.
  598. See Documentation/debugging-via-ohci1394.txt for more information.
  599. config FIREWIRE_OHCI_REMOTE_DMA
  600. bool "Remote debugging over FireWire with firewire-ohci"
  601. depends on FIREWIRE_OHCI
  602. help
  603. This option lets you use the FireWire bus for remote debugging
  604. with help of the firewire-ohci driver. It enables unfiltered
  605. remote DMA in firewire-ohci.
  606. See Documentation/debugging-via-ohci1394.txt for more information.
  607. If unsure, say N.
  608. source "samples/Kconfig"
  609. source "lib/Kconfig.kgdb"