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-rw-r--r--kernel/trace/Kconfig112
1 files changed, 56 insertions, 56 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index d006554888dc..6c22d8a2f289 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -12,17 +12,17 @@ config NOP_TRACER
12config HAVE_FTRACE_NMI_ENTER 12config HAVE_FTRACE_NMI_ENTER
13 bool 13 bool
14 help 14 help
15 See Documentation/trace/ftrace-implementation.txt 15 See Documentation/trace/ftrace-design.txt
16 16
17config HAVE_FUNCTION_TRACER 17config HAVE_FUNCTION_TRACER
18 bool 18 bool
19 help 19 help
20 See Documentation/trace/ftrace-implementation.txt 20 See Documentation/trace/ftrace-design.txt
21 21
22config HAVE_FUNCTION_GRAPH_TRACER 22config HAVE_FUNCTION_GRAPH_TRACER
23 bool 23 bool
24 help 24 help
25 See Documentation/trace/ftrace-implementation.txt 25 See Documentation/trace/ftrace-design.txt
26 26
27config HAVE_FUNCTION_GRAPH_FP_TEST 27config HAVE_FUNCTION_GRAPH_FP_TEST
28 bool 28 bool
@@ -34,17 +34,17 @@ config HAVE_FUNCTION_GRAPH_FP_TEST
34config HAVE_FUNCTION_TRACE_MCOUNT_TEST 34config HAVE_FUNCTION_TRACE_MCOUNT_TEST
35 bool 35 bool
36 help 36 help
37 See Documentation/trace/ftrace-implementation.txt 37 See Documentation/trace/ftrace-design.txt
38 38
39config HAVE_DYNAMIC_FTRACE 39config HAVE_DYNAMIC_FTRACE
40 bool 40 bool
41 help 41 help
42 See Documentation/trace/ftrace-implementation.txt 42 See Documentation/trace/ftrace-design.txt
43 43
44config HAVE_FTRACE_MCOUNT_RECORD 44config HAVE_FTRACE_MCOUNT_RECORD
45 bool 45 bool
46 help 46 help
47 See Documentation/trace/ftrace-implementation.txt 47 See Documentation/trace/ftrace-design.txt
48 48
49config HAVE_HW_BRANCH_TRACER 49config HAVE_HW_BRANCH_TRACER
50 bool 50 bool
@@ -52,7 +52,7 @@ config HAVE_HW_BRANCH_TRACER
52config HAVE_SYSCALL_TRACEPOINTS 52config HAVE_SYSCALL_TRACEPOINTS
53 bool 53 bool
54 help 54 help
55 See Documentation/trace/ftrace-implementation.txt 55 See Documentation/trace/ftrace-design.txt
56 56
57config TRACER_MAX_TRACE 57config TRACER_MAX_TRACE
58 bool 58 bool
@@ -83,7 +83,7 @@ config RING_BUFFER_ALLOW_SWAP
83# This allows those options to appear when no other tracer is selected. But the 83# This allows those options to appear when no other tracer is selected. But the
84# options do not appear when something else selects it. We need the two options 84# options do not appear when something else selects it. We need the two options
85# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the 85# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the
86# hidding of the automatic options. 86# hiding of the automatic options.
87 87
88config TRACING 88config TRACING
89 bool 89 bool
@@ -119,7 +119,7 @@ menuconfig FTRACE
119 bool "Tracers" 119 bool "Tracers"
120 default y if DEBUG_KERNEL 120 default y if DEBUG_KERNEL
121 help 121 help
122 Enable the kernel tracing infrastructure. 122 Enable the kernel tracing infrastructure.
123 123
124if FTRACE 124if FTRACE
125 125
@@ -133,7 +133,7 @@ config FUNCTION_TRACER
133 help 133 help
134 Enable the kernel to trace every kernel function. This is done 134 Enable the kernel to trace every kernel function. This is done
135 by using a compiler feature to insert a small, 5-byte No-Operation 135 by using a compiler feature to insert a small, 5-byte No-Operation
136 instruction to the beginning of every kernel function, which NOP 136 instruction at the beginning of every kernel function, which NOP
137 sequence is then dynamically patched into a tracer call when 137 sequence is then dynamically patched into a tracer call when
138 tracing is enabled by the administrator. If it's runtime disabled 138 tracing is enabled by the administrator. If it's runtime disabled
139 (the bootup default), then the overhead of the instructions is very 139 (the bootup default), then the overhead of the instructions is very
@@ -150,7 +150,7 @@ config FUNCTION_GRAPH_TRACER
150 and its entry. 150 and its entry.
151 Its first purpose is to trace the duration of functions and 151 Its first purpose is to trace the duration of functions and
152 draw a call graph for each thread with some information like 152 draw a call graph for each thread with some information like
153 the return value. This is done by setting the current return 153 the return value. This is done by setting the current return
154 address on the current task structure into a stack of calls. 154 address on the current task structure into a stack of calls.
155 155
156 156
@@ -173,7 +173,7 @@ config IRQSOFF_TRACER
173 173
174 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency 174 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
175 175
176 (Note that kernel size and overhead increases with this option 176 (Note that kernel size and overhead increase with this option
177 enabled. This option and the preempt-off timing option can be 177 enabled. This option and the preempt-off timing option can be
178 used together or separately.) 178 used together or separately.)
179 179
@@ -186,7 +186,7 @@ config PREEMPT_TRACER
186 select TRACER_MAX_TRACE 186 select TRACER_MAX_TRACE
187 select RING_BUFFER_ALLOW_SWAP 187 select RING_BUFFER_ALLOW_SWAP
188 help 188 help
189 This option measures the time spent in preemption off critical 189 This option measures the time spent in preemption-off critical
190 sections, with microsecond accuracy. 190 sections, with microsecond accuracy.
191 191
192 The default measurement method is a maximum search, which is 192 The default measurement method is a maximum search, which is
@@ -195,7 +195,7 @@ config PREEMPT_TRACER
195 195
196 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency 196 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
197 197
198 (Note that kernel size and overhead increases with this option 198 (Note that kernel size and overhead increase with this option
199 enabled. This option and the irqs-off timing option can be 199 enabled. This option and the irqs-off timing option can be
200 used together or separately.) 200 used together or separately.)
201 201
@@ -222,7 +222,7 @@ config ENABLE_DEFAULT_TRACERS
222 depends on !GENERIC_TRACER 222 depends on !GENERIC_TRACER
223 select TRACING 223 select TRACING
224 help 224 help
225 This tracer hooks to various trace points in the kernel 225 This tracer hooks to various trace points in the kernel,
226 allowing the user to pick and choose which trace point they 226 allowing the user to pick and choose which trace point they
227 want to trace. It also includes the sched_switch tracer plugin. 227 want to trace. It also includes the sched_switch tracer plugin.
228 228
@@ -265,19 +265,19 @@ choice
265 The likely/unlikely profiler only looks at the conditions that 265 The likely/unlikely profiler only looks at the conditions that
266 are annotated with a likely or unlikely macro. 266 are annotated with a likely or unlikely macro.
267 267
268 The "all branch" profiler will profile every if statement in the 268 The "all branch" profiler will profile every if-statement in the
269 kernel. This profiler will also enable the likely/unlikely 269 kernel. This profiler will also enable the likely/unlikely
270 profiler as well. 270 profiler.
271 271
272 Either of the above profilers add a bit of overhead to the system. 272 Either of the above profilers adds a bit of overhead to the system.
273 If unsure choose "No branch profiling". 273 If unsure, choose "No branch profiling".
274 274
275config BRANCH_PROFILE_NONE 275config BRANCH_PROFILE_NONE
276 bool "No branch profiling" 276 bool "No branch profiling"
277 help 277 help
278 No branch profiling. Branch profiling adds a bit of overhead. 278 No branch profiling. Branch profiling adds a bit of overhead.
279 Only enable it if you want to analyse the branching behavior. 279 Only enable it if you want to analyse the branching behavior.
280 Otherwise keep it disabled. 280 Otherwise keep it disabled.
281 281
282config PROFILE_ANNOTATED_BRANCHES 282config PROFILE_ANNOTATED_BRANCHES
283 bool "Trace likely/unlikely profiler" 283 bool "Trace likely/unlikely profiler"
@@ -288,7 +288,7 @@ config PROFILE_ANNOTATED_BRANCHES
288 288
289 /sys/kernel/debug/tracing/profile_annotated_branch 289 /sys/kernel/debug/tracing/profile_annotated_branch
290 290
291 Note: this will add a significant overhead, only turn this 291 Note: this will add a significant overhead; only turn this
292 on if you need to profile the system's use of these macros. 292 on if you need to profile the system's use of these macros.
293 293
294config PROFILE_ALL_BRANCHES 294config PROFILE_ALL_BRANCHES
@@ -305,7 +305,7 @@ config PROFILE_ALL_BRANCHES
305 305
306 This configuration, when enabled, will impose a great overhead 306 This configuration, when enabled, will impose a great overhead
307 on the system. This should only be enabled when the system 307 on the system. This should only be enabled when the system
308 is to be analyzed 308 is to be analyzed in much detail.
309endchoice 309endchoice
310 310
311config TRACING_BRANCHES 311config TRACING_BRANCHES
@@ -335,7 +335,7 @@ config POWER_TRACER
335 depends on X86 335 depends on X86
336 select GENERIC_TRACER 336 select GENERIC_TRACER
337 help 337 help
338 This tracer helps developers to analyze and optimize the kernels 338 This tracer helps developers to analyze and optimize the kernel's
339 power management decisions, specifically the C-state and P-state 339 power management decisions, specifically the C-state and P-state
340 behavior. 340 behavior.
341 341
@@ -391,14 +391,14 @@ config HW_BRANCH_TRACER
391 select GENERIC_TRACER 391 select GENERIC_TRACER
392 help 392 help
393 This tracer records all branches on the system in a circular 393 This tracer records all branches on the system in a circular
394 buffer giving access to the last N branches for each cpu. 394 buffer, giving access to the last N branches for each cpu.
395 395
396config KMEMTRACE 396config KMEMTRACE
397 bool "Trace SLAB allocations" 397 bool "Trace SLAB allocations"
398 select GENERIC_TRACER 398 select GENERIC_TRACER
399 help 399 help
400 kmemtrace provides tracing for slab allocator functions, such as 400 kmemtrace provides tracing for slab allocator functions, such as
401 kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected 401 kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
402 data is then fed to the userspace application in order to analyse 402 data is then fed to the userspace application in order to analyse
403 allocation hotspots, internal fragmentation and so on, making it 403 allocation hotspots, internal fragmentation and so on, making it
404 possible to see how well an allocator performs, as well as debug 404 possible to see how well an allocator performs, as well as debug
@@ -417,15 +417,15 @@ config WORKQUEUE_TRACER
417 bool "Trace workqueues" 417 bool "Trace workqueues"
418 select GENERIC_TRACER 418 select GENERIC_TRACER
419 help 419 help
420 The workqueue tracer provides some statistical informations 420 The workqueue tracer provides some statistical information
421 about each cpu workqueue thread such as the number of the 421 about each cpu workqueue thread such as the number of the
422 works inserted and executed since their creation. It can help 422 works inserted and executed since their creation. It can help
423 to evaluate the amount of work each of them have to perform. 423 to evaluate the amount of work each of them has to perform.
424 For example it can help a developer to decide whether he should 424 For example it can help a developer to decide whether he should
425 choose a per cpu workqueue instead of a singlethreaded one. 425 choose a per-cpu workqueue instead of a singlethreaded one.
426 426
427config BLK_DEV_IO_TRACE 427config BLK_DEV_IO_TRACE
428 bool "Support for tracing block io actions" 428 bool "Support for tracing block IO actions"
429 depends on SYSFS 429 depends on SYSFS
430 depends on BLOCK 430 depends on BLOCK
431 select RELAY 431 select RELAY
@@ -456,15 +456,15 @@ config KPROBE_EVENT
456 select TRACING 456 select TRACING
457 default y 457 default y
458 help 458 help
459 This allows the user to add tracing events (similar to tracepoints) on the fly 459 This allows the user to add tracing events (similar to tracepoints)
460 via the ftrace interface. See Documentation/trace/kprobetrace.txt 460 on the fly via the ftrace interface. See
461 for more details. 461 Documentation/trace/kprobetrace.txt for more details.
462 462
463 Those events can be inserted wherever kprobes can probe, and record 463 Those events can be inserted wherever kprobes can probe, and record
464 various register and memory values. 464 various register and memory values.
465 465
466 This option is also required by perf-probe subcommand of perf tools. If 466 This option is also required by perf-probe subcommand of perf tools.
467 you want to use perf tools, this option is strongly recommended. 467 If you want to use perf tools, this option is strongly recommended.
468 468
469config DYNAMIC_FTRACE 469config DYNAMIC_FTRACE
470 bool "enable/disable ftrace tracepoints dynamically" 470 bool "enable/disable ftrace tracepoints dynamically"
@@ -472,32 +472,32 @@ config DYNAMIC_FTRACE
472 depends on HAVE_DYNAMIC_FTRACE 472 depends on HAVE_DYNAMIC_FTRACE
473 default y 473 default y
474 help 474 help
475 This option will modify all the calls to ftrace dynamically 475 This option will modify all the calls to ftrace dynamically
476 (will patch them out of the binary image and replaces them 476 (will patch them out of the binary image and replace them
477 with a No-Op instruction) as they are called. A table is 477 with a No-Op instruction) as they are called. A table is
478 created to dynamically enable them again. 478 created to dynamically enable them again.
479 479
480 This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise 480 This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but
481 has native performance as long as no tracing is active. 481 otherwise has native performance as long as no tracing is active.
482 482
483 The changes to the code are done by a kernel thread that 483 The changes to the code are done by a kernel thread that
484 wakes up once a second and checks to see if any ftrace calls 484 wakes up once a second and checks to see if any ftrace calls
485 were made. If so, it runs stop_machine (stops all CPUS) 485 were made. If so, it runs stop_machine (stops all CPUS)
486 and modifies the code to jump over the call to ftrace. 486 and modifies the code to jump over the call to ftrace.
487 487
488config FUNCTION_PROFILER 488config FUNCTION_PROFILER
489 bool "Kernel function profiler" 489 bool "Kernel function profiler"
490 depends on FUNCTION_TRACER 490 depends on FUNCTION_TRACER
491 default n 491 default n
492 help 492 help
493 This option enables the kernel function profiler. A file is created 493 This option enables the kernel function profiler. A file is created
494 in debugfs called function_profile_enabled which defaults to zero. 494 in debugfs called function_profile_enabled which defaults to zero.
495 When a 1 is echoed into this file profiling begins, and when a 495 When a 1 is echoed into this file profiling begins, and when a
496 zero is entered, profiling stops. A file in the trace_stats 496 zero is entered, profiling stops. A "functions" file is created in
497 directory called functions, that show the list of functions that 497 the trace_stats directory; this file shows the list of functions that
498 have been hit and their counters. 498 have been hit and their counters.
499 499
500 If in doubt, say N 500 If in doubt, say N.
501 501
502config FTRACE_MCOUNT_RECORD 502config FTRACE_MCOUNT_RECORD
503 def_bool y 503 def_bool y
@@ -556,8 +556,8 @@ config RING_BUFFER_BENCHMARK
556 tristate "Ring buffer benchmark stress tester" 556 tristate "Ring buffer benchmark stress tester"
557 depends on RING_BUFFER 557 depends on RING_BUFFER
558 help 558 help
559 This option creates a test to stress the ring buffer and bench mark it. 559 This option creates a test to stress the ring buffer and benchmark it.
560 It creates its own ring buffer such that it will not interfer with 560 It creates its own ring buffer such that it will not interfere with
561 any other users of the ring buffer (such as ftrace). It then creates 561 any other users of the ring buffer (such as ftrace). It then creates
562 a producer and consumer that will run for 10 seconds and sleep for 562 a producer and consumer that will run for 10 seconds and sleep for
563 10 seconds. Each interval it will print out the number of events 563 10 seconds. Each interval it will print out the number of events
@@ -566,7 +566,7 @@ config RING_BUFFER_BENCHMARK
566 It does not disable interrupts or raise its priority, so it may be 566 It does not disable interrupts or raise its priority, so it may be
567 affected by processes that are running. 567 affected by processes that are running.
568 568
569 If unsure, say N 569 If unsure, say N.
570 570
571endif # FTRACE 571endif # FTRACE
572 572