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352ad25a SR |
1 | /* |
2 | * trace task wakeup timings | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Based on code from the latency_tracer, that is: | |
8 | * | |
9 | * Copyright (C) 2004-2006 Ingo Molnar | |
10 | * Copyright (C) 2004 William Lee Irwin III | |
11 | */ | |
12 | #include <linux/module.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/debugfs.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/uaccess.h> | |
17 | #include <linux/ftrace.h> | |
ad8d75ff | 18 | #include <trace/events/sched.h> |
352ad25a SR |
19 | |
20 | #include "trace.h" | |
21 | ||
22 | static struct trace_array *wakeup_trace; | |
23 | static int __read_mostly tracer_enabled; | |
24 | ||
25 | static struct task_struct *wakeup_task; | |
26 | static int wakeup_cpu; | |
478142c3 | 27 | static int wakeup_current_cpu; |
352ad25a | 28 | static unsigned wakeup_prio = -1; |
3244351c | 29 | static int wakeup_rt; |
352ad25a | 30 | |
445c8951 | 31 | static arch_spinlock_t wakeup_lock = |
edc35bd7 | 32 | (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
352ad25a | 33 | |
7495a5be | 34 | static void wakeup_reset(struct trace_array *tr); |
e309b41d | 35 | static void __wakeup_reset(struct trace_array *tr); |
7495a5be JO |
36 | static int wakeup_graph_entry(struct ftrace_graph_ent *trace); |
37 | static void wakeup_graph_return(struct ftrace_graph_ret *trace); | |
352ad25a | 38 | |
e9d25fe6 SR |
39 | static int save_lat_flag; |
40 | ||
7495a5be JO |
41 | #define TRACE_DISPLAY_GRAPH 1 |
42 | ||
43 | static struct tracer_opt trace_opts[] = { | |
44 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
45 | /* display latency trace as call graph */ | |
46 | { TRACER_OPT(display-graph, TRACE_DISPLAY_GRAPH) }, | |
47 | #endif | |
48 | { } /* Empty entry */ | |
49 | }; | |
50 | ||
51 | static struct tracer_flags tracer_flags = { | |
52 | .val = 0, | |
53 | .opts = trace_opts, | |
54 | }; | |
55 | ||
56 | #define is_graph() (tracer_flags.val & TRACE_DISPLAY_GRAPH) | |
57 | ||
606576ce | 58 | #ifdef CONFIG_FUNCTION_TRACER |
542181d3 | 59 | |
7e18d8e7 | 60 | /* |
542181d3 SR |
61 | * Prologue for the wakeup function tracers. |
62 | * | |
63 | * Returns 1 if it is OK to continue, and preemption | |
64 | * is disabled and data->disabled is incremented. | |
65 | * 0 if the trace is to be ignored, and preemption | |
66 | * is not disabled and data->disabled is | |
67 | * kept the same. | |
68 | * | |
69 | * Note, this function is also used outside this ifdef but | |
70 | * inside the #ifdef of the function graph tracer below. | |
71 | * This is OK, since the function graph tracer is | |
72 | * dependent on the function tracer. | |
7e18d8e7 | 73 | */ |
542181d3 SR |
74 | static int |
75 | func_prolog_preempt_disable(struct trace_array *tr, | |
76 | struct trace_array_cpu **data, | |
77 | int *pc) | |
7e18d8e7 | 78 | { |
7e18d8e7 | 79 | long disabled; |
7e18d8e7 SR |
80 | int cpu; |
81 | ||
82 | if (likely(!wakeup_task)) | |
542181d3 | 83 | return 0; |
7e18d8e7 | 84 | |
542181d3 | 85 | *pc = preempt_count(); |
5168ae50 | 86 | preempt_disable_notrace(); |
7e18d8e7 SR |
87 | |
88 | cpu = raw_smp_processor_id(); | |
478142c3 SR |
89 | if (cpu != wakeup_current_cpu) |
90 | goto out_enable; | |
91 | ||
542181d3 SR |
92 | *data = tr->data[cpu]; |
93 | disabled = atomic_inc_return(&(*data)->disabled); | |
7e18d8e7 SR |
94 | if (unlikely(disabled != 1)) |
95 | goto out; | |
96 | ||
542181d3 | 97 | return 1; |
7e18d8e7 | 98 | |
542181d3 SR |
99 | out: |
100 | atomic_dec(&(*data)->disabled); | |
7e18d8e7 | 101 | |
542181d3 SR |
102 | out_enable: |
103 | preempt_enable_notrace(); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* | |
108 | * wakeup uses its own tracer function to keep the overhead down: | |
109 | */ | |
110 | static void | |
111 | wakeup_tracer_call(unsigned long ip, unsigned long parent_ip) | |
112 | { | |
113 | struct trace_array *tr = wakeup_trace; | |
114 | struct trace_array_cpu *data; | |
115 | unsigned long flags; | |
116 | int pc; | |
117 | ||
118 | if (!func_prolog_preempt_disable(tr, &data, &pc)) | |
119 | return; | |
120 | ||
121 | local_irq_save(flags); | |
122 | trace_function(tr, ip, parent_ip, flags, pc); | |
e59494f4 | 123 | local_irq_restore(flags); |
7e18d8e7 | 124 | |
7e18d8e7 | 125 | atomic_dec(&data->disabled); |
5168ae50 | 126 | preempt_enable_notrace(); |
7e18d8e7 SR |
127 | } |
128 | ||
129 | static struct ftrace_ops trace_ops __read_mostly = | |
130 | { | |
131 | .func = wakeup_tracer_call, | |
b848914c | 132 | .flags = FTRACE_OPS_FL_GLOBAL, |
7e18d8e7 | 133 | }; |
7e40798f | 134 | #endif /* CONFIG_FUNCTION_TRACER */ |
7495a5be JO |
135 | |
136 | static int start_func_tracer(int graph) | |
137 | { | |
138 | int ret; | |
139 | ||
140 | if (!graph) | |
141 | ret = register_ftrace_function(&trace_ops); | |
142 | else | |
143 | ret = register_ftrace_graph(&wakeup_graph_return, | |
144 | &wakeup_graph_entry); | |
145 | ||
146 | if (!ret && tracing_is_enabled()) | |
147 | tracer_enabled = 1; | |
148 | else | |
149 | tracer_enabled = 0; | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static void stop_func_tracer(int graph) | |
155 | { | |
156 | tracer_enabled = 0; | |
157 | ||
158 | if (!graph) | |
159 | unregister_ftrace_function(&trace_ops); | |
160 | else | |
161 | unregister_ftrace_graph(); | |
162 | } | |
163 | ||
7495a5be JO |
164 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
165 | static int wakeup_set_flag(u32 old_flags, u32 bit, int set) | |
166 | { | |
167 | ||
168 | if (!(bit & TRACE_DISPLAY_GRAPH)) | |
169 | return -EINVAL; | |
170 | ||
171 | if (!(is_graph() ^ set)) | |
172 | return 0; | |
173 | ||
174 | stop_func_tracer(!set); | |
175 | ||
176 | wakeup_reset(wakeup_trace); | |
177 | tracing_max_latency = 0; | |
178 | ||
179 | return start_func_tracer(set); | |
180 | } | |
181 | ||
182 | static int wakeup_graph_entry(struct ftrace_graph_ent *trace) | |
183 | { | |
184 | struct trace_array *tr = wakeup_trace; | |
185 | struct trace_array_cpu *data; | |
186 | unsigned long flags; | |
542181d3 | 187 | int pc, ret = 0; |
7495a5be | 188 | |
542181d3 | 189 | if (!func_prolog_preempt_disable(tr, &data, &pc)) |
7495a5be JO |
190 | return 0; |
191 | ||
7495a5be JO |
192 | local_save_flags(flags); |
193 | ret = __trace_graph_entry(tr, trace, flags, pc); | |
7495a5be | 194 | atomic_dec(&data->disabled); |
7495a5be | 195 | preempt_enable_notrace(); |
542181d3 | 196 | |
7495a5be JO |
197 | return ret; |
198 | } | |
199 | ||
200 | static void wakeup_graph_return(struct ftrace_graph_ret *trace) | |
201 | { | |
202 | struct trace_array *tr = wakeup_trace; | |
203 | struct trace_array_cpu *data; | |
204 | unsigned long flags; | |
542181d3 | 205 | int pc; |
7495a5be | 206 | |
542181d3 | 207 | if (!func_prolog_preempt_disable(tr, &data, &pc)) |
7495a5be JO |
208 | return; |
209 | ||
7495a5be JO |
210 | local_save_flags(flags); |
211 | __trace_graph_return(tr, trace, flags, pc); | |
7495a5be JO |
212 | atomic_dec(&data->disabled); |
213 | ||
7495a5be JO |
214 | preempt_enable_notrace(); |
215 | return; | |
216 | } | |
217 | ||
218 | static void wakeup_trace_open(struct trace_iterator *iter) | |
219 | { | |
220 | if (is_graph()) | |
221 | graph_trace_open(iter); | |
222 | } | |
223 | ||
224 | static void wakeup_trace_close(struct trace_iterator *iter) | |
225 | { | |
226 | if (iter->private) | |
227 | graph_trace_close(iter); | |
228 | } | |
229 | ||
230 | #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC) | |
231 | ||
232 | static enum print_line_t wakeup_print_line(struct trace_iterator *iter) | |
233 | { | |
234 | /* | |
235 | * In graph mode call the graph tracer output function, | |
236 | * otherwise go with the TRACE_FN event handler | |
237 | */ | |
238 | if (is_graph()) | |
239 | return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS); | |
240 | ||
241 | return TRACE_TYPE_UNHANDLED; | |
242 | } | |
243 | ||
244 | static void wakeup_print_header(struct seq_file *s) | |
245 | { | |
246 | if (is_graph()) | |
247 | print_graph_headers_flags(s, GRAPH_TRACER_FLAGS); | |
248 | else | |
249 | trace_default_header(s); | |
250 | } | |
251 | ||
252 | static void | |
253 | __trace_function(struct trace_array *tr, | |
254 | unsigned long ip, unsigned long parent_ip, | |
255 | unsigned long flags, int pc) | |
256 | { | |
257 | if (is_graph()) | |
258 | trace_graph_function(tr, ip, parent_ip, flags, pc); | |
259 | else | |
260 | trace_function(tr, ip, parent_ip, flags, pc); | |
261 | } | |
262 | #else | |
263 | #define __trace_function trace_function | |
264 | ||
265 | static int wakeup_set_flag(u32 old_flags, u32 bit, int set) | |
266 | { | |
267 | return -EINVAL; | |
268 | } | |
269 | ||
270 | static int wakeup_graph_entry(struct ftrace_graph_ent *trace) | |
271 | { | |
272 | return -1; | |
273 | } | |
274 | ||
275 | static enum print_line_t wakeup_print_line(struct trace_iterator *iter) | |
276 | { | |
277 | return TRACE_TYPE_UNHANDLED; | |
278 | } | |
279 | ||
280 | static void wakeup_graph_return(struct ftrace_graph_ret *trace) { } | |
281 | static void wakeup_print_header(struct seq_file *s) { } | |
282 | static void wakeup_trace_open(struct trace_iterator *iter) { } | |
283 | static void wakeup_trace_close(struct trace_iterator *iter) { } | |
284 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
285 | ||
352ad25a SR |
286 | /* |
287 | * Should this new latency be reported/recorded? | |
288 | */ | |
e309b41d | 289 | static int report_latency(cycle_t delta) |
352ad25a SR |
290 | { |
291 | if (tracing_thresh) { | |
292 | if (delta < tracing_thresh) | |
293 | return 0; | |
294 | } else { | |
295 | if (delta <= tracing_max_latency) | |
296 | return 0; | |
297 | } | |
298 | return 1; | |
299 | } | |
300 | ||
38516ab5 SR |
301 | static void |
302 | probe_wakeup_migrate_task(void *ignore, struct task_struct *task, int cpu) | |
478142c3 SR |
303 | { |
304 | if (task != wakeup_task) | |
305 | return; | |
306 | ||
307 | wakeup_current_cpu = cpu; | |
308 | } | |
309 | ||
5b82a1b0 | 310 | static void notrace |
38516ab5 SR |
311 | probe_wakeup_sched_switch(void *ignore, |
312 | struct task_struct *prev, struct task_struct *next) | |
352ad25a | 313 | { |
352ad25a SR |
314 | struct trace_array_cpu *data; |
315 | cycle_t T0, T1, delta; | |
316 | unsigned long flags; | |
317 | long disabled; | |
318 | int cpu; | |
38697053 | 319 | int pc; |
352ad25a | 320 | |
b07c3f19 MD |
321 | tracing_record_cmdline(prev); |
322 | ||
352ad25a SR |
323 | if (unlikely(!tracer_enabled)) |
324 | return; | |
325 | ||
326 | /* | |
327 | * When we start a new trace, we set wakeup_task to NULL | |
328 | * and then set tracer_enabled = 1. We want to make sure | |
329 | * that another CPU does not see the tracer_enabled = 1 | |
330 | * and the wakeup_task with an older task, that might | |
331 | * actually be the same as next. | |
332 | */ | |
333 | smp_rmb(); | |
334 | ||
335 | if (next != wakeup_task) | |
336 | return; | |
337 | ||
38697053 SR |
338 | pc = preempt_count(); |
339 | ||
352ad25a SR |
340 | /* disable local data, not wakeup_cpu data */ |
341 | cpu = raw_smp_processor_id(); | |
b07c3f19 | 342 | disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled); |
352ad25a SR |
343 | if (likely(disabled != 1)) |
344 | goto out; | |
345 | ||
e59494f4 | 346 | local_irq_save(flags); |
0199c4e6 | 347 | arch_spin_lock(&wakeup_lock); |
352ad25a SR |
348 | |
349 | /* We could race with grabbing wakeup_lock */ | |
350 | if (unlikely(!tracer_enabled || next != wakeup_task)) | |
351 | goto out_unlock; | |
352 | ||
9be24414 SR |
353 | /* The task we are waiting for is waking up */ |
354 | data = wakeup_trace->data[wakeup_cpu]; | |
355 | ||
7495a5be | 356 | __trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc); |
7be42151 | 357 | tracing_sched_switch_trace(wakeup_trace, prev, next, flags, pc); |
352ad25a | 358 | |
352ad25a | 359 | T0 = data->preempt_timestamp; |
750ed1a4 | 360 | T1 = ftrace_now(cpu); |
352ad25a SR |
361 | delta = T1-T0; |
362 | ||
363 | if (!report_latency(delta)) | |
364 | goto out_unlock; | |
365 | ||
b5130b1e CE |
366 | if (likely(!is_tracing_stopped())) { |
367 | tracing_max_latency = delta; | |
368 | update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu); | |
369 | } | |
352ad25a | 370 | |
352ad25a | 371 | out_unlock: |
b07c3f19 | 372 | __wakeup_reset(wakeup_trace); |
0199c4e6 | 373 | arch_spin_unlock(&wakeup_lock); |
e59494f4 | 374 | local_irq_restore(flags); |
352ad25a | 375 | out: |
b07c3f19 | 376 | atomic_dec(&wakeup_trace->data[cpu]->disabled); |
5b82a1b0 MD |
377 | } |
378 | ||
e309b41d | 379 | static void __wakeup_reset(struct trace_array *tr) |
352ad25a | 380 | { |
352ad25a SR |
381 | wakeup_cpu = -1; |
382 | wakeup_prio = -1; | |
383 | ||
384 | if (wakeup_task) | |
385 | put_task_struct(wakeup_task); | |
386 | ||
387 | wakeup_task = NULL; | |
388 | } | |
389 | ||
e309b41d | 390 | static void wakeup_reset(struct trace_array *tr) |
352ad25a SR |
391 | { |
392 | unsigned long flags; | |
393 | ||
2f26ebd5 SR |
394 | tracing_reset_online_cpus(tr); |
395 | ||
e59494f4 | 396 | local_irq_save(flags); |
0199c4e6 | 397 | arch_spin_lock(&wakeup_lock); |
352ad25a | 398 | __wakeup_reset(tr); |
0199c4e6 | 399 | arch_spin_unlock(&wakeup_lock); |
e59494f4 | 400 | local_irq_restore(flags); |
352ad25a SR |
401 | } |
402 | ||
e309b41d | 403 | static void |
38516ab5 | 404 | probe_wakeup(void *ignore, struct task_struct *p, int success) |
352ad25a | 405 | { |
f8ec1062 | 406 | struct trace_array_cpu *data; |
352ad25a SR |
407 | int cpu = smp_processor_id(); |
408 | unsigned long flags; | |
409 | long disabled; | |
38697053 | 410 | int pc; |
352ad25a | 411 | |
b07c3f19 MD |
412 | if (likely(!tracer_enabled)) |
413 | return; | |
414 | ||
415 | tracing_record_cmdline(p); | |
416 | tracing_record_cmdline(current); | |
417 | ||
3244351c | 418 | if ((wakeup_rt && !rt_task(p)) || |
352ad25a | 419 | p->prio >= wakeup_prio || |
b07c3f19 | 420 | p->prio >= current->prio) |
352ad25a SR |
421 | return; |
422 | ||
38697053 | 423 | pc = preempt_count(); |
b07c3f19 | 424 | disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled); |
352ad25a SR |
425 | if (unlikely(disabled != 1)) |
426 | goto out; | |
427 | ||
428 | /* interrupts should be off from try_to_wake_up */ | |
0199c4e6 | 429 | arch_spin_lock(&wakeup_lock); |
352ad25a SR |
430 | |
431 | /* check for races. */ | |
432 | if (!tracer_enabled || p->prio >= wakeup_prio) | |
433 | goto out_locked; | |
434 | ||
435 | /* reset the trace */ | |
b07c3f19 | 436 | __wakeup_reset(wakeup_trace); |
352ad25a SR |
437 | |
438 | wakeup_cpu = task_cpu(p); | |
478142c3 | 439 | wakeup_current_cpu = wakeup_cpu; |
352ad25a SR |
440 | wakeup_prio = p->prio; |
441 | ||
442 | wakeup_task = p; | |
443 | get_task_struct(wakeup_task); | |
444 | ||
445 | local_save_flags(flags); | |
446 | ||
f8ec1062 SR |
447 | data = wakeup_trace->data[wakeup_cpu]; |
448 | data->preempt_timestamp = ftrace_now(cpu); | |
7be42151 | 449 | tracing_sched_wakeup_trace(wakeup_trace, p, current, flags, pc); |
301fd748 SR |
450 | |
451 | /* | |
452 | * We must be careful in using CALLER_ADDR2. But since wake_up | |
453 | * is not called by an assembly function (where as schedule is) | |
454 | * it should be safe to use it here. | |
455 | */ | |
7495a5be | 456 | __trace_function(wakeup_trace, CALLER_ADDR1, CALLER_ADDR2, flags, pc); |
352ad25a SR |
457 | |
458 | out_locked: | |
0199c4e6 | 459 | arch_spin_unlock(&wakeup_lock); |
352ad25a | 460 | out: |
b07c3f19 | 461 | atomic_dec(&wakeup_trace->data[cpu]->disabled); |
352ad25a SR |
462 | } |
463 | ||
e309b41d | 464 | static void start_wakeup_tracer(struct trace_array *tr) |
352ad25a | 465 | { |
5b82a1b0 MD |
466 | int ret; |
467 | ||
38516ab5 | 468 | ret = register_trace_sched_wakeup(probe_wakeup, NULL); |
5b82a1b0 | 469 | if (ret) { |
b07c3f19 | 470 | pr_info("wakeup trace: Couldn't activate tracepoint" |
5b82a1b0 MD |
471 | " probe to kernel_sched_wakeup\n"); |
472 | return; | |
473 | } | |
474 | ||
38516ab5 | 475 | ret = register_trace_sched_wakeup_new(probe_wakeup, NULL); |
5b82a1b0 | 476 | if (ret) { |
b07c3f19 | 477 | pr_info("wakeup trace: Couldn't activate tracepoint" |
5b82a1b0 MD |
478 | " probe to kernel_sched_wakeup_new\n"); |
479 | goto fail_deprobe; | |
480 | } | |
481 | ||
38516ab5 | 482 | ret = register_trace_sched_switch(probe_wakeup_sched_switch, NULL); |
5b82a1b0 | 483 | if (ret) { |
b07c3f19 | 484 | pr_info("sched trace: Couldn't activate tracepoint" |
73d8b8bc | 485 | " probe to kernel_sched_switch\n"); |
5b82a1b0 MD |
486 | goto fail_deprobe_wake_new; |
487 | } | |
488 | ||
38516ab5 | 489 | ret = register_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); |
478142c3 SR |
490 | if (ret) { |
491 | pr_info("wakeup trace: Couldn't activate tracepoint" | |
492 | " probe to kernel_sched_migrate_task\n"); | |
493 | return; | |
494 | } | |
495 | ||
352ad25a SR |
496 | wakeup_reset(tr); |
497 | ||
498 | /* | |
499 | * Don't let the tracer_enabled = 1 show up before | |
500 | * the wakeup_task is reset. This may be overkill since | |
501 | * wakeup_reset does a spin_unlock after setting the | |
502 | * wakeup_task to NULL, but I want to be safe. | |
503 | * This is a slow path anyway. | |
504 | */ | |
505 | smp_wmb(); | |
506 | ||
7495a5be JO |
507 | if (start_func_tracer(is_graph())) |
508 | printk(KERN_ERR "failed to start wakeup tracer\n"); | |
ad591240 | 509 | |
352ad25a | 510 | return; |
5b82a1b0 | 511 | fail_deprobe_wake_new: |
38516ab5 | 512 | unregister_trace_sched_wakeup_new(probe_wakeup, NULL); |
5b82a1b0 | 513 | fail_deprobe: |
38516ab5 | 514 | unregister_trace_sched_wakeup(probe_wakeup, NULL); |
352ad25a SR |
515 | } |
516 | ||
e309b41d | 517 | static void stop_wakeup_tracer(struct trace_array *tr) |
352ad25a SR |
518 | { |
519 | tracer_enabled = 0; | |
7495a5be | 520 | stop_func_tracer(is_graph()); |
38516ab5 SR |
521 | unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL); |
522 | unregister_trace_sched_wakeup_new(probe_wakeup, NULL); | |
523 | unregister_trace_sched_wakeup(probe_wakeup, NULL); | |
524 | unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL); | |
352ad25a SR |
525 | } |
526 | ||
3244351c | 527 | static int __wakeup_tracer_init(struct trace_array *tr) |
352ad25a | 528 | { |
e9d25fe6 SR |
529 | save_lat_flag = trace_flags & TRACE_ITER_LATENCY_FMT; |
530 | trace_flags |= TRACE_ITER_LATENCY_FMT; | |
531 | ||
745b1626 | 532 | tracing_max_latency = 0; |
352ad25a | 533 | wakeup_trace = tr; |
c76f0694 | 534 | start_wakeup_tracer(tr); |
1c80025a | 535 | return 0; |
352ad25a SR |
536 | } |
537 | ||
3244351c SR |
538 | static int wakeup_tracer_init(struct trace_array *tr) |
539 | { | |
540 | wakeup_rt = 0; | |
541 | return __wakeup_tracer_init(tr); | |
542 | } | |
543 | ||
544 | static int wakeup_rt_tracer_init(struct trace_array *tr) | |
545 | { | |
546 | wakeup_rt = 1; | |
547 | return __wakeup_tracer_init(tr); | |
548 | } | |
549 | ||
e309b41d | 550 | static void wakeup_tracer_reset(struct trace_array *tr) |
352ad25a | 551 | { |
c76f0694 SR |
552 | stop_wakeup_tracer(tr); |
553 | /* make sure we put back any tasks we are tracing */ | |
554 | wakeup_reset(tr); | |
e9d25fe6 SR |
555 | |
556 | if (!save_lat_flag) | |
557 | trace_flags &= ~TRACE_ITER_LATENCY_FMT; | |
352ad25a SR |
558 | } |
559 | ||
9036990d SR |
560 | static void wakeup_tracer_start(struct trace_array *tr) |
561 | { | |
562 | wakeup_reset(tr); | |
563 | tracer_enabled = 1; | |
9036990d SR |
564 | } |
565 | ||
566 | static void wakeup_tracer_stop(struct trace_array *tr) | |
567 | { | |
568 | tracer_enabled = 0; | |
352ad25a SR |
569 | } |
570 | ||
571 | static struct tracer wakeup_tracer __read_mostly = | |
572 | { | |
573 | .name = "wakeup", | |
574 | .init = wakeup_tracer_init, | |
575 | .reset = wakeup_tracer_reset, | |
9036990d SR |
576 | .start = wakeup_tracer_start, |
577 | .stop = wakeup_tracer_stop, | |
352ad25a | 578 | .print_max = 1, |
7495a5be JO |
579 | .print_header = wakeup_print_header, |
580 | .print_line = wakeup_print_line, | |
581 | .flags = &tracer_flags, | |
582 | .set_flag = wakeup_set_flag, | |
60a11774 SR |
583 | #ifdef CONFIG_FTRACE_SELFTEST |
584 | .selftest = trace_selftest_startup_wakeup, | |
585 | #endif | |
7495a5be JO |
586 | .open = wakeup_trace_open, |
587 | .close = wakeup_trace_close, | |
ef710e10 | 588 | .use_max_tr = 1, |
352ad25a SR |
589 | }; |
590 | ||
3244351c SR |
591 | static struct tracer wakeup_rt_tracer __read_mostly = |
592 | { | |
593 | .name = "wakeup_rt", | |
594 | .init = wakeup_rt_tracer_init, | |
595 | .reset = wakeup_tracer_reset, | |
596 | .start = wakeup_tracer_start, | |
597 | .stop = wakeup_tracer_stop, | |
6eaaa5d5 | 598 | .wait_pipe = poll_wait_pipe, |
3244351c | 599 | .print_max = 1, |
7495a5be JO |
600 | .print_header = wakeup_print_header, |
601 | .print_line = wakeup_print_line, | |
602 | .flags = &tracer_flags, | |
603 | .set_flag = wakeup_set_flag, | |
3244351c SR |
604 | #ifdef CONFIG_FTRACE_SELFTEST |
605 | .selftest = trace_selftest_startup_wakeup, | |
606 | #endif | |
7495a5be JO |
607 | .open = wakeup_trace_open, |
608 | .close = wakeup_trace_close, | |
ef710e10 | 609 | .use_max_tr = 1, |
3244351c SR |
610 | }; |
611 | ||
352ad25a SR |
612 | __init static int init_wakeup_tracer(void) |
613 | { | |
614 | int ret; | |
615 | ||
616 | ret = register_tracer(&wakeup_tracer); | |
617 | if (ret) | |
618 | return ret; | |
619 | ||
3244351c SR |
620 | ret = register_tracer(&wakeup_rt_tracer); |
621 | if (ret) | |
622 | return ret; | |
623 | ||
352ad25a SR |
624 | return 0; |
625 | } | |
626 | device_initcall(init_wakeup_tracer); |