Commit | Line | Data |
---|---|---|
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 | ||
352ad25a SR |
37 | config TRACER_MAX_TRACE |
38 | bool | |
39 | ||
7a8e76a3 SR |
40 | config RING_BUFFER |
41 | bool | |
42 | ||
78d904b4 SR |
43 | config FTRACE_NMI_ENTER |
44 | bool | |
45 | depends on HAVE_FTRACE_NMI_ENTER | |
46 | default y | |
47 | ||
bc0c38d1 SR |
48 | config TRACING |
49 | bool | |
50 | select DEBUG_FS | |
7a8e76a3 | 51 | select RING_BUFFER |
c2c80529 | 52 | select STACKTRACE if STACKTRACE_SUPPORT |
5f87f112 | 53 | select TRACEPOINTS |
f3384b28 | 54 | select NOP_TRACER |
bc0c38d1 | 55 | |
40ada30f IM |
56 | # |
57 | # Minimum requirements an architecture has to meet for us to | |
58 | # be able to offer generic tracing facilities: | |
59 | # | |
60 | config TRACING_SUPPORT | |
61 | bool | |
62 | depends on TRACE_IRQFLAGS_SUPPORT | |
63 | depends on STACKTRACE_SUPPORT | |
422d3c7a | 64 | default y |
40ada30f IM |
65 | |
66 | if TRACING_SUPPORT | |
67 | ||
17d80fd0 PZ |
68 | menu "Tracers" |
69 | ||
606576ce | 70 | config FUNCTION_TRACER |
1b29b018 | 71 | bool "Kernel Function Tracer" |
606576ce | 72 | depends on HAVE_FUNCTION_TRACER |
1b29b018 | 73 | select FRAME_POINTER |
4d7a077c | 74 | select KALLSYMS |
1b29b018 | 75 | select TRACING |
35e8e302 | 76 | select CONTEXT_SWITCH_TRACER |
1b29b018 SR |
77 | help |
78 | Enable the kernel to trace every kernel function. This is done | |
79 | by using a compiler feature to insert a small, 5-byte No-Operation | |
80 | instruction to the beginning of every kernel function, which NOP | |
81 | sequence is then dynamically patched into a tracer call when | |
82 | tracing is enabled by the administrator. If it's runtime disabled | |
83 | (the bootup default), then the overhead of the instructions is very | |
84 | small and not measurable even in micro-benchmarks. | |
35e8e302 | 85 | |
fb52607a FW |
86 | config FUNCTION_GRAPH_TRACER |
87 | bool "Kernel Function Graph Tracer" | |
88 | depends on HAVE_FUNCTION_GRAPH_TRACER | |
15e6cb36 | 89 | depends on FUNCTION_TRACER |
764f3b95 | 90 | default y |
15e6cb36 | 91 | help |
fb52607a FW |
92 | Enable the kernel to trace a function at both its return |
93 | and its entry. | |
94 | It's first purpose is to trace the duration of functions and | |
95 | draw a call graph for each thread with some informations like | |
96 | the return value. | |
97 | This is done by setting the current return address on the current | |
98 | task structure into a stack of calls. | |
15e6cb36 | 99 | |
1427cdf0 LJ |
100 | config TRACE_BPRINTK |
101 | bool "Binary printk for tracing" | |
102 | default y | |
103 | depends on TRACING | |
104 | select BINARY_PRINTF | |
105 | ||
81d68a96 SR |
106 | config IRQSOFF_TRACER |
107 | bool "Interrupts-off Latency Tracer" | |
108 | default n | |
109 | depends on TRACE_IRQFLAGS_SUPPORT | |
110 | depends on GENERIC_TIME | |
111 | select TRACE_IRQFLAGS | |
112 | select TRACING | |
113 | select TRACER_MAX_TRACE | |
114 | help | |
115 | This option measures the time spent in irqs-off critical | |
116 | sections, with microsecond accuracy. | |
117 | ||
118 | The default measurement method is a maximum search, which is | |
119 | disabled by default and can be runtime (re-)started | |
120 | via: | |
121 | ||
122 | echo 0 > /debugfs/tracing/tracing_max_latency | |
123 | ||
6cd8a4bb SR |
124 | (Note that kernel size and overhead increases with this option |
125 | enabled. This option and the preempt-off timing option can be | |
126 | used together or separately.) | |
127 | ||
128 | config PREEMPT_TRACER | |
129 | bool "Preemption-off Latency Tracer" | |
130 | default n | |
131 | depends on GENERIC_TIME | |
132 | depends on PREEMPT | |
133 | select TRACING | |
134 | select TRACER_MAX_TRACE | |
135 | help | |
136 | This option measures the time spent in preemption off critical | |
137 | sections, with microsecond accuracy. | |
138 | ||
139 | The default measurement method is a maximum search, which is | |
140 | disabled by default and can be runtime (re-)started | |
141 | via: | |
142 | ||
143 | echo 0 > /debugfs/tracing/tracing_max_latency | |
144 | ||
145 | (Note that kernel size and overhead increases with this option | |
146 | enabled. This option and the irqs-off timing option can be | |
147 | used together or separately.) | |
148 | ||
f06c3810 IM |
149 | config SYSPROF_TRACER |
150 | bool "Sysprof Tracer" | |
4d2df795 | 151 | depends on X86 |
f06c3810 | 152 | select TRACING |
b22f4858 | 153 | select CONTEXT_SWITCH_TRACER |
f06c3810 IM |
154 | help |
155 | This tracer provides the trace needed by the 'Sysprof' userspace | |
156 | tool. | |
157 | ||
352ad25a SR |
158 | config SCHED_TRACER |
159 | bool "Scheduling Latency Tracer" | |
352ad25a SR |
160 | select TRACING |
161 | select CONTEXT_SWITCH_TRACER | |
162 | select TRACER_MAX_TRACE | |
163 | help | |
164 | This tracer tracks the latency of the highest priority task | |
165 | to be scheduled in, starting from the point it has woken up. | |
166 | ||
35e8e302 SR |
167 | config CONTEXT_SWITCH_TRACER |
168 | bool "Trace process context switches" | |
35e8e302 SR |
169 | select TRACING |
170 | select MARKERS | |
171 | help | |
172 | This tracer gets called from the context switch and records | |
173 | all switching of tasks. | |
174 | ||
b77e38aa SR |
175 | config EVENT_TRACER |
176 | bool "Trace various events in the kernel" | |
b77e38aa SR |
177 | select TRACING |
178 | help | |
179 | This tracer hooks to various trace points in the kernel | |
180 | allowing the user to pick and choose which trace point they | |
181 | want to trace. | |
182 | ||
1f5c2abb FW |
183 | config BOOT_TRACER |
184 | bool "Trace boot initcalls" | |
1f5c2abb | 185 | select TRACING |
ea31e72d | 186 | select CONTEXT_SWITCH_TRACER |
1f5c2abb FW |
187 | help |
188 | This tracer helps developers to optimize boot times: it records | |
98d9c66a IM |
189 | the timings of the initcalls and traces key events and the identity |
190 | of tasks that can cause boot delays, such as context-switches. | |
191 | ||
192 | Its aim is to be parsed by the /scripts/bootgraph.pl tool to | |
193 | produce pretty graphics about boot inefficiencies, giving a visual | |
194 | representation of the delays during initcalls - but the raw | |
195 | /debug/tracing/trace text output is readable too. | |
196 | ||
79fb0768 SR |
197 | You must pass in ftrace=initcall to the kernel command line |
198 | to enable this on bootup. | |
1f5c2abb | 199 | |
2ed84eeb | 200 | config TRACE_BRANCH_PROFILING |
1f0d69a9 | 201 | bool "Trace likely/unlikely profiler" |
1f0d69a9 SR |
202 | select TRACING |
203 | help | |
204 | This tracer profiles all the the likely and unlikely macros | |
205 | in the kernel. It will display the results in: | |
206 | ||
45b79749 | 207 | /debugfs/tracing/profile_annotated_branch |
1f0d69a9 SR |
208 | |
209 | Note: this will add a significant overhead, only turn this | |
210 | on if you need to profile the system's use of these macros. | |
211 | ||
212 | Say N if unsure. | |
213 | ||
2bcd521a SR |
214 | config PROFILE_ALL_BRANCHES |
215 | bool "Profile all if conditionals" | |
216 | depends on TRACE_BRANCH_PROFILING | |
217 | help | |
218 | This tracer profiles all branch conditions. Every if () | |
219 | taken in the kernel is recorded whether it hit or miss. | |
220 | The results will be displayed in: | |
221 | ||
222 | /debugfs/tracing/profile_branch | |
223 | ||
224 | This configuration, when enabled, will impose a great overhead | |
225 | on the system. This should only be enabled when the system | |
226 | is to be analyzed | |
227 | ||
228 | Say N if unsure. | |
229 | ||
2ed84eeb | 230 | config TRACING_BRANCHES |
52f232cb SR |
231 | bool |
232 | help | |
233 | Selected by tracers that will trace the likely and unlikely | |
234 | conditions. This prevents the tracers themselves from being | |
235 | profiled. Profiling the tracing infrastructure can only happen | |
236 | when the likelys and unlikelys are not being traced. | |
237 | ||
2ed84eeb | 238 | config BRANCH_TRACER |
52f232cb | 239 | bool "Trace likely/unlikely instances" |
2ed84eeb SR |
240 | depends on TRACE_BRANCH_PROFILING |
241 | select TRACING_BRANCHES | |
52f232cb SR |
242 | help |
243 | This traces the events of likely and unlikely condition | |
244 | calls in the kernel. The difference between this and the | |
245 | "Trace likely/unlikely profiler" is that this is not a | |
246 | histogram of the callers, but actually places the calling | |
247 | events into a running trace buffer to see when and where the | |
248 | events happened, as well as their results. | |
249 | ||
250 | Say N if unsure. | |
251 | ||
f3f47a67 AV |
252 | config POWER_TRACER |
253 | bool "Trace power consumption behavior" | |
f3f47a67 AV |
254 | depends on X86 |
255 | select TRACING | |
256 | help | |
257 | This tracer helps developers to analyze and optimize the kernels | |
258 | power management decisions, specifically the C-state and P-state | |
259 | behavior. | |
260 | ||
261 | ||
e5a81b62 SR |
262 | config STACK_TRACER |
263 | bool "Trace max stack" | |
606576ce | 264 | depends on HAVE_FUNCTION_TRACER |
606576ce | 265 | select FUNCTION_TRACER |
e5a81b62 | 266 | select STACKTRACE |
4d7a077c | 267 | select KALLSYMS |
e5a81b62 | 268 | help |
4519d9e5 IM |
269 | This special tracer records the maximum stack footprint of the |
270 | kernel and displays it in debugfs/tracing/stack_trace. | |
271 | ||
272 | This tracer works by hooking into every function call that the | |
273 | kernel executes, and keeping a maximum stack depth value and | |
f38f1d2a SR |
274 | stack-trace saved. If this is configured with DYNAMIC_FTRACE |
275 | then it will not have any overhead while the stack tracer | |
276 | is disabled. | |
277 | ||
278 | To enable the stack tracer on bootup, pass in 'stacktrace' | |
279 | on the kernel command line. | |
280 | ||
281 | The stack tracer can also be enabled or disabled via the | |
282 | sysctl kernel.stack_tracer_enabled | |
4519d9e5 IM |
283 | |
284 | Say N if unsure. | |
e5a81b62 | 285 | |
a93751ca | 286 | config HW_BRANCH_TRACER |
1e9b51c2 | 287 | depends on HAVE_HW_BRANCH_TRACER |
a93751ca | 288 | bool "Trace hw branches" |
1e9b51c2 MM |
289 | select TRACING |
290 | help | |
291 | This tracer records all branches on the system in a circular | |
292 | buffer giving access to the last N branches for each cpu. | |
293 | ||
36994e58 FW |
294 | config KMEMTRACE |
295 | bool "Trace SLAB allocations" | |
296 | select TRACING | |
36994e58 FW |
297 | help |
298 | kmemtrace provides tracing for slab allocator functions, such as | |
299 | kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected | |
300 | data is then fed to the userspace application in order to analyse | |
301 | allocation hotspots, internal fragmentation and so on, making it | |
302 | possible to see how well an allocator performs, as well as debug | |
303 | and profile kernel code. | |
304 | ||
305 | This requires an userspace application to use. See | |
306 | Documentation/vm/kmemtrace.txt for more information. | |
307 | ||
308 | Saying Y will make the kernel somewhat larger and slower. However, | |
309 | if you disable kmemtrace at run-time or boot-time, the performance | |
310 | impact is minimal (depending on the arch the kernel is built for). | |
311 | ||
312 | If unsure, say N. | |
313 | ||
e1d8aa9f FW |
314 | config WORKQUEUE_TRACER |
315 | bool "Trace workqueues" | |
316 | select TRACING | |
317 | help | |
318 | The workqueue tracer provides some statistical informations | |
319 | about each cpu workqueue thread such as the number of the | |
320 | works inserted and executed since their creation. It can help | |
321 | to evaluate the amount of work each of them have to perform. | |
322 | For example it can help a developer to decide whether he should | |
323 | choose a per cpu workqueue instead of a singlethreaded one. | |
324 | ||
2db270a8 FW |
325 | config BLK_DEV_IO_TRACE |
326 | bool "Support for tracing block io actions" | |
327 | depends on SYSFS | |
1dfba05d | 328 | depends on BLOCK |
2db270a8 FW |
329 | select RELAY |
330 | select DEBUG_FS | |
331 | select TRACEPOINTS | |
332 | select TRACING | |
333 | select STACKTRACE | |
334 | help | |
335 | Say Y here if you want to be able to trace the block layer actions | |
336 | on a given queue. Tracing allows you to see any traffic happening | |
337 | on a block device queue. For more information (and the userspace | |
338 | support tools needed), fetch the blktrace tools from: | |
339 | ||
340 | git://git.kernel.dk/blktrace.git | |
341 | ||
342 | Tracing also is possible using the ftrace interface, e.g.: | |
343 | ||
344 | echo 1 > /sys/block/sda/sda1/trace/enable | |
345 | echo blk > /sys/kernel/debug/tracing/current_tracer | |
346 | cat /sys/kernel/debug/tracing/trace_pipe | |
347 | ||
348 | If unsure, say N. | |
36994e58 | 349 | |
3d083395 SR |
350 | config DYNAMIC_FTRACE |
351 | bool "enable/disable ftrace tracepoints dynamically" | |
606576ce | 352 | depends on FUNCTION_TRACER |
677aa9f7 | 353 | depends on HAVE_DYNAMIC_FTRACE |
3d083395 SR |
354 | default y |
355 | help | |
356 | This option will modify all the calls to ftrace dynamically | |
357 | (will patch them out of the binary image and replaces them | |
358 | with a No-Op instruction) as they are called. A table is | |
359 | created to dynamically enable them again. | |
360 | ||
606576ce | 361 | This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise |
3d083395 SR |
362 | has native performance as long as no tracing is active. |
363 | ||
364 | The changes to the code are done by a kernel thread that | |
365 | wakes up once a second and checks to see if any ftrace calls | |
366 | were made. If so, it runs stop_machine (stops all CPUS) | |
367 | and modifies the code to jump over the call to ftrace. | |
60a11774 | 368 | |
8da3821b SR |
369 | config FTRACE_MCOUNT_RECORD |
370 | def_bool y | |
371 | depends on DYNAMIC_FTRACE | |
372 | depends on HAVE_FTRACE_MCOUNT_RECORD | |
373 | ||
60a11774 SR |
374 | config FTRACE_SELFTEST |
375 | bool | |
376 | ||
377 | config FTRACE_STARTUP_TEST | |
378 | bool "Perform a startup test on ftrace" | |
40ada30f | 379 | depends on TRACING |
60a11774 SR |
380 | select FTRACE_SELFTEST |
381 | help | |
382 | This option performs a series of startup tests on ftrace. On bootup | |
383 | a series of tests are made to verify that the tracer is | |
384 | functioning properly. It will do tests on all the configured | |
385 | tracers of ftrace. | |
17d80fd0 | 386 | |
fe6f90e5 PP |
387 | config MMIOTRACE |
388 | bool "Memory mapped IO tracing" | |
40ada30f | 389 | depends on HAVE_MMIOTRACE_SUPPORT && PCI |
fe6f90e5 PP |
390 | select TRACING |
391 | help | |
392 | Mmiotrace traces Memory Mapped I/O access and is meant for | |
393 | debugging and reverse engineering. It is called from the ioremap | |
394 | implementation and works via page faults. Tracing is disabled by | |
395 | default and can be enabled at run-time. | |
396 | ||
397 | See Documentation/tracers/mmiotrace.txt. | |
398 | If you are not helping to develop drivers, say N. | |
399 | ||
400 | config MMIOTRACE_TEST | |
401 | tristate "Test module for mmiotrace" | |
402 | depends on MMIOTRACE && m | |
403 | help | |
404 | This is a dumb module for testing mmiotrace. It is very dangerous | |
405 | as it will write garbage to IO memory starting at a given address. | |
406 | However, it should be safe to use on e.g. unused portion of VRAM. | |
407 | ||
408 | Say N, unless you absolutely know what you are doing. | |
409 | ||
17d80fd0 | 410 | endmenu |
40ada30f IM |
411 | |
412 | endif # TRACING_SUPPORT | |
413 |