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Commit | Line | Data |
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16444a8a | 1 | # |
606576ce SR |
2 | # Architectures that offer an FUNCTION_TRACER implementation should |
3 | # select HAVE_FUNCTION_TRACER: | |
16444a8a | 4 | # |
2a3a4f66 | 5 | |
8d26487f TE |
6 | config USER_STACKTRACE_SUPPORT |
7 | bool | |
8 | ||
2a3a4f66 FW |
9 | config NOP_TRACER |
10 | bool | |
11 | ||
78d904b4 SR |
12 | config HAVE_FTRACE_NMI_ENTER |
13 | bool | |
14 | ||
606576ce | 15 | config HAVE_FUNCTION_TRACER |
16444a8a | 16 | bool |
bc0c38d1 | 17 | |
fb52607a | 18 | config HAVE_FUNCTION_GRAPH_TRACER |
15e6cb36 FW |
19 | bool |
20 | ||
60a7ecf4 SR |
21 | config HAVE_FUNCTION_TRACE_MCOUNT_TEST |
22 | bool | |
23 | help | |
24 | This gets selected when the arch tests the function_trace_stop | |
25 | variable at the mcount call site. Otherwise, this variable | |
26 | is tested by the called function. | |
27 | ||
677aa9f7 SR |
28 | config HAVE_DYNAMIC_FTRACE |
29 | bool | |
30 | ||
8da3821b SR |
31 | config HAVE_FTRACE_MCOUNT_RECORD |
32 | bool | |
33 | ||
1e9b51c2 MM |
34 | config HAVE_HW_BRANCH_TRACER |
35 | bool | |
36 | ||
ee08c6ec FW |
37 | config HAVE_FTRACE_SYSCALLS |
38 | bool | |
39 | ||
352ad25a SR |
40 | config TRACER_MAX_TRACE |
41 | bool | |
42 | ||
7a8e76a3 SR |
43 | config RING_BUFFER |
44 | bool | |
45 | ||
78d904b4 SR |
46 | config FTRACE_NMI_ENTER |
47 | bool | |
48 | depends on HAVE_FTRACE_NMI_ENTER | |
49 | default y | |
50 | ||
bc0c38d1 SR |
51 | config TRACING |
52 | bool | |
53 | select DEBUG_FS | |
7a8e76a3 | 54 | select RING_BUFFER |
c2c80529 | 55 | select STACKTRACE if STACKTRACE_SUPPORT |
5f87f112 | 56 | select TRACEPOINTS |
f3384b28 | 57 | select NOP_TRACER |
769b0441 | 58 | select BINARY_PRINTF |
bc0c38d1 | 59 | |
40ada30f IM |
60 | # |
61 | # Minimum requirements an architecture has to meet for us to | |
62 | # be able to offer generic tracing facilities: | |
63 | # | |
64 | config TRACING_SUPPORT | |
65 | bool | |
45b95608 AV |
66 | # PPC32 has no irqflags tracing support, but it can use most of the |
67 | # tracers anyway, they were tested to build and work. Note that new | |
68 | # exceptions to this list aren't welcomed, better implement the | |
69 | # irqflags tracing for your architecture. | |
70 | depends on TRACE_IRQFLAGS_SUPPORT || PPC32 | |
40ada30f | 71 | depends on STACKTRACE_SUPPORT |
422d3c7a | 72 | default y |
40ada30f IM |
73 | |
74 | if TRACING_SUPPORT | |
bc0c38d1 | 75 | |
17d80fd0 PZ |
76 | menu "Tracers" |
77 | ||
606576ce | 78 | config FUNCTION_TRACER |
1b29b018 | 79 | bool "Kernel Function Tracer" |
606576ce | 80 | depends on HAVE_FUNCTION_TRACER |
1b29b018 | 81 | select FRAME_POINTER |
4d7a077c | 82 | select KALLSYMS |
1b29b018 | 83 | select TRACING |
35e8e302 | 84 | select CONTEXT_SWITCH_TRACER |
1b29b018 SR |
85 | help |
86 | Enable the kernel to trace every kernel function. This is done | |
87 | by using a compiler feature to insert a small, 5-byte No-Operation | |
88 | instruction to the beginning of every kernel function, which NOP | |
89 | sequence is then dynamically patched into a tracer call when | |
90 | tracing is enabled by the administrator. If it's runtime disabled | |
91 | (the bootup default), then the overhead of the instructions is very | |
92 | small and not measurable even in micro-benchmarks. | |
35e8e302 | 93 | |
fb52607a FW |
94 | config FUNCTION_GRAPH_TRACER |
95 | bool "Kernel Function Graph Tracer" | |
96 | depends on HAVE_FUNCTION_GRAPH_TRACER | |
15e6cb36 | 97 | depends on FUNCTION_TRACER |
764f3b95 | 98 | default y |
15e6cb36 | 99 | help |
fb52607a FW |
100 | Enable the kernel to trace a function at both its return |
101 | and its entry. | |
692105b8 ML |
102 | Its first purpose is to trace the duration of functions and |
103 | draw a call graph for each thread with some information like | |
104 | the return value. This is done by setting the current return | |
105 | address on the current task structure into a stack of calls. | |
15e6cb36 | 106 | |
81d68a96 SR |
107 | config IRQSOFF_TRACER |
108 | bool "Interrupts-off Latency Tracer" | |
109 | default n | |
110 | depends on TRACE_IRQFLAGS_SUPPORT | |
111 | depends on GENERIC_TIME | |
112 | select TRACE_IRQFLAGS | |
113 | select TRACING | |
114 | select TRACER_MAX_TRACE | |
115 | help | |
116 | This option measures the time spent in irqs-off critical | |
117 | sections, with microsecond accuracy. | |
118 | ||
119 | The default measurement method is a maximum search, which is | |
120 | disabled by default and can be runtime (re-)started | |
121 | via: | |
122 | ||
123 | echo 0 > /debugfs/tracing/tracing_max_latency | |
124 | ||
6cd8a4bb SR |
125 | (Note that kernel size and overhead increases with this option |
126 | enabled. This option and the preempt-off timing option can be | |
127 | used together or separately.) | |
128 | ||
129 | config PREEMPT_TRACER | |
130 | bool "Preemption-off Latency Tracer" | |
131 | default n | |
132 | depends on GENERIC_TIME | |
133 | depends on PREEMPT | |
134 | select TRACING | |
135 | select TRACER_MAX_TRACE | |
136 | help | |
137 | This option measures the time spent in preemption off critical | |
138 | sections, with microsecond accuracy. | |
139 | ||
140 | The default measurement method is a maximum search, which is | |
141 | disabled by default and can be runtime (re-)started | |
142 | via: | |
143 | ||
144 | echo 0 > /debugfs/tracing/tracing_max_latency | |
145 | ||
146 | (Note that kernel size and overhead increases with this option | |
147 | enabled. This option and the irqs-off timing option can be | |
148 | used together or separately.) | |
149 | ||
f06c3810 IM |
150 | config SYSPROF_TRACER |
151 | bool "Sysprof Tracer" | |
4d2df795 | 152 | depends on X86 |
f06c3810 | 153 | select TRACING |
b22f4858 | 154 | select CONTEXT_SWITCH_TRACER |
f06c3810 IM |
155 | help |
156 | This tracer provides the trace needed by the 'Sysprof' userspace | |
157 | tool. | |
158 | ||
352ad25a SR |
159 | config SCHED_TRACER |
160 | bool "Scheduling Latency Tracer" | |
352ad25a SR |
161 | select TRACING |
162 | select CONTEXT_SWITCH_TRACER | |
163 | select TRACER_MAX_TRACE | |
164 | help | |
165 | This tracer tracks the latency of the highest priority task | |
166 | to be scheduled in, starting from the point it has woken up. | |
167 | ||
35e8e302 SR |
168 | config CONTEXT_SWITCH_TRACER |
169 | bool "Trace process context switches" | |
35e8e302 SR |
170 | select TRACING |
171 | select MARKERS | |
172 | help | |
173 | This tracer gets called from the context switch and records | |
174 | all switching of tasks. | |
175 | ||
b77e38aa SR |
176 | config EVENT_TRACER |
177 | bool "Trace various events in the kernel" | |
b77e38aa SR |
178 | select TRACING |
179 | help | |
180 | This tracer hooks to various trace points in the kernel | |
181 | allowing the user to pick and choose which trace point they | |
182 | want to trace. | |
183 | ||
ee08c6ec FW |
184 | config FTRACE_SYSCALLS |
185 | bool "Trace syscalls" | |
186 | depends on HAVE_FTRACE_SYSCALLS | |
187 | select TRACING | |
0ea1c415 | 188 | select KALLSYMS |
ee08c6ec FW |
189 | help |
190 | Basic tracer to catch the syscall entry and exit events. | |
191 | ||
1f5c2abb FW |
192 | config BOOT_TRACER |
193 | bool "Trace boot initcalls" | |
1f5c2abb | 194 | select TRACING |
ea31e72d | 195 | select CONTEXT_SWITCH_TRACER |
1f5c2abb FW |
196 | help |
197 | This tracer helps developers to optimize boot times: it records | |
98d9c66a IM |
198 | the timings of the initcalls and traces key events and the identity |
199 | of tasks that can cause boot delays, such as context-switches. | |
200 | ||
201 | Its aim is to be parsed by the /scripts/bootgraph.pl tool to | |
202 | produce pretty graphics about boot inefficiencies, giving a visual | |
203 | representation of the delays during initcalls - but the raw | |
204 | /debug/tracing/trace text output is readable too. | |
205 | ||
79fb0768 SR |
206 | You must pass in ftrace=initcall to the kernel command line |
207 | to enable this on bootup. | |
1f5c2abb | 208 | |
2ed84eeb | 209 | config TRACE_BRANCH_PROFILING |
1f0d69a9 | 210 | bool "Trace likely/unlikely profiler" |
1f0d69a9 SR |
211 | select TRACING |
212 | help | |
213 | This tracer profiles all the the likely and unlikely macros | |
214 | in the kernel. It will display the results in: | |
215 | ||
45b79749 | 216 | /debugfs/tracing/profile_annotated_branch |
1f0d69a9 SR |
217 | |
218 | Note: this will add a significant overhead, only turn this | |
219 | on if you need to profile the system's use of these macros. | |
220 | ||
221 | Say N if unsure. | |
222 | ||
2bcd521a SR |
223 | config PROFILE_ALL_BRANCHES |
224 | bool "Profile all if conditionals" | |
225 | depends on TRACE_BRANCH_PROFILING | |
226 | help | |
227 | This tracer profiles all branch conditions. Every if () | |
228 | taken in the kernel is recorded whether it hit or miss. | |
229 | The results will be displayed in: | |
230 | ||
231 | /debugfs/tracing/profile_branch | |
232 | ||
233 | This configuration, when enabled, will impose a great overhead | |
234 | on the system. This should only be enabled when the system | |
235 | is to be analyzed | |
236 | ||
237 | Say N if unsure. | |
238 | ||
2ed84eeb | 239 | config TRACING_BRANCHES |
52f232cb SR |
240 | bool |
241 | help | |
242 | Selected by tracers that will trace the likely and unlikely | |
243 | conditions. This prevents the tracers themselves from being | |
244 | profiled. Profiling the tracing infrastructure can only happen | |
245 | when the likelys and unlikelys are not being traced. | |
246 | ||
2ed84eeb | 247 | config BRANCH_TRACER |
52f232cb | 248 | bool "Trace likely/unlikely instances" |
2ed84eeb SR |
249 | depends on TRACE_BRANCH_PROFILING |
250 | select TRACING_BRANCHES | |
52f232cb SR |
251 | help |
252 | This traces the events of likely and unlikely condition | |
253 | calls in the kernel. The difference between this and the | |
254 | "Trace likely/unlikely profiler" is that this is not a | |
255 | histogram of the callers, but actually places the calling | |
256 | events into a running trace buffer to see when and where the | |
257 | events happened, as well as their results. | |
258 | ||
259 | Say N if unsure. | |
260 | ||
f3f47a67 AV |
261 | config POWER_TRACER |
262 | bool "Trace power consumption behavior" | |
f3f47a67 AV |
263 | depends on X86 |
264 | select TRACING | |
265 | help | |
266 | This tracer helps developers to analyze and optimize the kernels | |
267 | power management decisions, specifically the C-state and P-state | |
268 | behavior. | |
269 | ||
270 | ||
e5a81b62 SR |
271 | config STACK_TRACER |
272 | bool "Trace max stack" | |
606576ce | 273 | depends on HAVE_FUNCTION_TRACER |
606576ce | 274 | select FUNCTION_TRACER |
e5a81b62 | 275 | select STACKTRACE |
4d7a077c | 276 | select KALLSYMS |
e5a81b62 | 277 | help |
4519d9e5 IM |
278 | This special tracer records the maximum stack footprint of the |
279 | kernel and displays it in debugfs/tracing/stack_trace. | |
280 | ||
281 | This tracer works by hooking into every function call that the | |
282 | kernel executes, and keeping a maximum stack depth value and | |
f38f1d2a SR |
283 | stack-trace saved. If this is configured with DYNAMIC_FTRACE |
284 | then it will not have any overhead while the stack tracer | |
285 | is disabled. | |
286 | ||
287 | To enable the stack tracer on bootup, pass in 'stacktrace' | |
288 | on the kernel command line. | |
289 | ||
290 | The stack tracer can also be enabled or disabled via the | |
291 | sysctl kernel.stack_tracer_enabled | |
4519d9e5 IM |
292 | |
293 | Say N if unsure. | |
e5a81b62 | 294 | |
a93751ca | 295 | config HW_BRANCH_TRACER |
1e9b51c2 | 296 | depends on HAVE_HW_BRANCH_TRACER |
a93751ca | 297 | bool "Trace hw branches" |
1e9b51c2 MM |
298 | select TRACING |
299 | help | |
300 | This tracer records all branches on the system in a circular | |
301 | buffer giving access to the last N branches for each cpu. | |
302 | ||
36994e58 FW |
303 | config KMEMTRACE |
304 | bool "Trace SLAB allocations" | |
305 | select TRACING | |
36994e58 FW |
306 | help |
307 | kmemtrace provides tracing for slab allocator functions, such as | |
308 | kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected | |
309 | data is then fed to the userspace application in order to analyse | |
310 | allocation hotspots, internal fragmentation and so on, making it | |
311 | possible to see how well an allocator performs, as well as debug | |
312 | and profile kernel code. | |
313 | ||
314 | This requires an userspace application to use. See | |
4d1f4372 | 315 | Documentation/trace/kmemtrace.txt for more information. |
36994e58 FW |
316 | |
317 | Saying Y will make the kernel somewhat larger and slower. However, | |
318 | if you disable kmemtrace at run-time or boot-time, the performance | |
319 | impact is minimal (depending on the arch the kernel is built for). | |
320 | ||
321 | If unsure, say N. | |
322 | ||
e1d8aa9f FW |
323 | config WORKQUEUE_TRACER |
324 | bool "Trace workqueues" | |
325 | select TRACING | |
326 | help | |
327 | The workqueue tracer provides some statistical informations | |
328 | about each cpu workqueue thread such as the number of the | |
329 | works inserted and executed since their creation. It can help | |
330 | to evaluate the amount of work each of them have to perform. | |
331 | For example it can help a developer to decide whether he should | |
332 | choose a per cpu workqueue instead of a singlethreaded one. | |
333 | ||
2db270a8 FW |
334 | config BLK_DEV_IO_TRACE |
335 | bool "Support for tracing block io actions" | |
336 | depends on SYSFS | |
1dfba05d | 337 | depends on BLOCK |
2db270a8 FW |
338 | select RELAY |
339 | select DEBUG_FS | |
340 | select TRACEPOINTS | |
341 | select TRACING | |
342 | select STACKTRACE | |
343 | help | |
344 | Say Y here if you want to be able to trace the block layer actions | |
345 | on a given queue. Tracing allows you to see any traffic happening | |
346 | on a block device queue. For more information (and the userspace | |
347 | support tools needed), fetch the blktrace tools from: | |
348 | ||
349 | git://git.kernel.dk/blktrace.git | |
350 | ||
351 | Tracing also is possible using the ftrace interface, e.g.: | |
352 | ||
353 | echo 1 > /sys/block/sda/sda1/trace/enable | |
354 | echo blk > /sys/kernel/debug/tracing/current_tracer | |
355 | cat /sys/kernel/debug/tracing/trace_pipe | |
356 | ||
357 | If unsure, say N. | |
36994e58 | 358 | |
3d083395 SR |
359 | config DYNAMIC_FTRACE |
360 | bool "enable/disable ftrace tracepoints dynamically" | |
606576ce | 361 | depends on FUNCTION_TRACER |
677aa9f7 | 362 | depends on HAVE_DYNAMIC_FTRACE |
3d083395 SR |
363 | default y |
364 | help | |
365 | This option will modify all the calls to ftrace dynamically | |
366 | (will patch them out of the binary image and replaces them | |
367 | with a No-Op instruction) as they are called. A table is | |
368 | created to dynamically enable them again. | |
369 | ||
606576ce | 370 | This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise |
3d083395 SR |
371 | has native performance as long as no tracing is active. |
372 | ||
373 | The changes to the code are done by a kernel thread that | |
374 | wakes up once a second and checks to see if any ftrace calls | |
375 | were made. If so, it runs stop_machine (stops all CPUS) | |
376 | and modifies the code to jump over the call to ftrace. | |
60a11774 | 377 | |
8da3821b SR |
378 | config FTRACE_MCOUNT_RECORD |
379 | def_bool y | |
380 | depends on DYNAMIC_FTRACE | |
381 | depends on HAVE_FTRACE_MCOUNT_RECORD | |
382 | ||
60a11774 SR |
383 | config FTRACE_SELFTEST |
384 | bool | |
385 | ||
386 | config FTRACE_STARTUP_TEST | |
387 | bool "Perform a startup test on ftrace" | |
40ada30f | 388 | depends on TRACING |
60a11774 SR |
389 | select FTRACE_SELFTEST |
390 | help | |
391 | This option performs a series of startup tests on ftrace. On bootup | |
392 | a series of tests are made to verify that the tracer is | |
393 | functioning properly. It will do tests on all the configured | |
394 | tracers of ftrace. | |
17d80fd0 | 395 | |
6bc5c366 PP |
396 | config MMIOTRACE |
397 | bool "Memory mapped IO tracing" | |
40ada30f | 398 | depends on HAVE_MMIOTRACE_SUPPORT && PCI |
6bc5c366 PP |
399 | select TRACING |
400 | help | |
401 | Mmiotrace traces Memory Mapped I/O access and is meant for | |
402 | debugging and reverse engineering. It is called from the ioremap | |
403 | implementation and works via page faults. Tracing is disabled by | |
404 | default and can be enabled at run-time. | |
405 | ||
4d1f4372 | 406 | See Documentation/trace/mmiotrace.txt. |
6bc5c366 PP |
407 | If you are not helping to develop drivers, say N. |
408 | ||
409 | config MMIOTRACE_TEST | |
410 | tristate "Test module for mmiotrace" | |
411 | depends on MMIOTRACE && m | |
412 | help | |
413 | This is a dumb module for testing mmiotrace. It is very dangerous | |
414 | as it will write garbage to IO memory starting at a given address. | |
415 | However, it should be safe to use on e.g. unused portion of VRAM. | |
416 | ||
417 | Say N, unless you absolutely know what you are doing. | |
418 | ||
17d80fd0 | 419 | endmenu |
40ada30f IM |
420 | |
421 | endif # TRACING_SUPPORT | |
422 |