Commit | Line | Data |
---|---|---|
1b29b018 SR |
1 | /* |
2 | * ring buffer based function tracer | |
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 | |
6d49e352 | 10 | * Copyright (C) 2004 Nadia Yvette Chambers |
1b29b018 | 11 | */ |
23b4ff3a | 12 | #include <linux/ring_buffer.h> |
1b29b018 SR |
13 | #include <linux/debugfs.h> |
14 | #include <linux/uaccess.h> | |
15 | #include <linux/ftrace.h> | |
2e0f5761 | 16 | #include <linux/fs.h> |
1b29b018 SR |
17 | |
18 | #include "trace.h" | |
19 | ||
a225cdd2 SR |
20 | /* function tracing enabled */ |
21 | static int ftrace_function_enabled; | |
22 | ||
53614991 SR |
23 | static struct trace_array *func_trace; |
24 | ||
a225cdd2 SR |
25 | static void tracing_start_function_trace(void); |
26 | static void tracing_stop_function_trace(void); | |
27 | ||
b6f11df2 | 28 | static int function_trace_init(struct trace_array *tr) |
1b29b018 | 29 | { |
bb3c3c95 | 30 | func_trace = tr; |
12883efb | 31 | tr->trace_buffer.cpu = get_cpu(); |
26bc83f4 SR |
32 | put_cpu(); |
33 | ||
41bc8144 | 34 | tracing_start_cmdline_record(); |
1b29b018 | 35 | tracing_start_function_trace(); |
1c80025a | 36 | return 0; |
1b29b018 SR |
37 | } |
38 | ||
e309b41d | 39 | static void function_trace_reset(struct trace_array *tr) |
1b29b018 | 40 | { |
b6f11df2 ACM |
41 | tracing_stop_function_trace(); |
42 | tracing_stop_cmdline_record(); | |
1b29b018 SR |
43 | } |
44 | ||
9036990d SR |
45 | static void function_trace_start(struct trace_array *tr) |
46 | { | |
12883efb | 47 | tracing_reset_online_cpus(&tr->trace_buffer); |
9036990d SR |
48 | } |
49 | ||
65f8c95e | 50 | /* Our option */ |
21f67940 AV |
51 | enum { |
52 | TRACE_FUNC_OPT_STACK = 0x1, | |
21f67940 AV |
53 | }; |
54 | ||
55 | static struct tracer_flags func_flags; | |
56 | ||
bb3c3c95 | 57 | static void |
2f5f6ad9 | 58 | function_trace_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 59 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
bb3c3c95 SR |
60 | { |
61 | struct trace_array *tr = func_trace; | |
62 | struct trace_array_cpu *data; | |
63 | unsigned long flags; | |
d41032a8 | 64 | int bit; |
bb3c3c95 SR |
65 | int cpu; |
66 | int pc; | |
67 | ||
68 | if (unlikely(!ftrace_function_enabled)) | |
69 | return; | |
70 | ||
897f68a4 SR |
71 | pc = preempt_count(); |
72 | preempt_disable_notrace(); | |
bb3c3c95 | 73 | |
897f68a4 SR |
74 | bit = trace_test_and_set_recursion(TRACE_FTRACE_START, TRACE_FTRACE_MAX); |
75 | if (bit < 0) | |
76 | goto out; | |
77 | ||
78 | cpu = smp_processor_id(); | |
12883efb | 79 | data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
897f68a4 SR |
80 | if (!atomic_read(&data->disabled)) { |
81 | local_save_flags(flags); | |
7be42151 | 82 | trace_function(tr, ip, parent_ip, flags, pc); |
bb3c3c95 | 83 | } |
897f68a4 | 84 | trace_clear_recursion(bit); |
bb3c3c95 | 85 | |
897f68a4 SR |
86 | out: |
87 | preempt_enable_notrace(); | |
bb3c3c95 SR |
88 | } |
89 | ||
53614991 | 90 | static void |
2f5f6ad9 | 91 | function_stack_trace_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 92 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
53614991 SR |
93 | { |
94 | struct trace_array *tr = func_trace; | |
95 | struct trace_array_cpu *data; | |
96 | unsigned long flags; | |
97 | long disabled; | |
98 | int cpu; | |
99 | int pc; | |
100 | ||
101 | if (unlikely(!ftrace_function_enabled)) | |
102 | return; | |
103 | ||
104 | /* | |
105 | * Need to use raw, since this must be called before the | |
106 | * recursive protection is performed. | |
107 | */ | |
108 | local_irq_save(flags); | |
109 | cpu = raw_smp_processor_id(); | |
12883efb | 110 | data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
53614991 SR |
111 | disabled = atomic_inc_return(&data->disabled); |
112 | ||
113 | if (likely(disabled == 1)) { | |
114 | pc = preempt_count(); | |
7be42151 | 115 | trace_function(tr, ip, parent_ip, flags, pc); |
53614991 SR |
116 | /* |
117 | * skip over 5 funcs: | |
118 | * __ftrace_trace_stack, | |
119 | * __trace_stack, | |
120 | * function_stack_trace_call | |
121 | * ftrace_list_func | |
122 | * ftrace_call | |
123 | */ | |
7be42151 | 124 | __trace_stack(tr, flags, 5, pc); |
53614991 SR |
125 | } |
126 | ||
127 | atomic_dec(&data->disabled); | |
128 | local_irq_restore(flags); | |
129 | } | |
130 | ||
bb3c3c95 SR |
131 | |
132 | static struct ftrace_ops trace_ops __read_mostly = | |
133 | { | |
134 | .func = function_trace_call, | |
4740974a | 135 | .flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE, |
bb3c3c95 SR |
136 | }; |
137 | ||
53614991 SR |
138 | static struct ftrace_ops trace_stack_ops __read_mostly = |
139 | { | |
140 | .func = function_stack_trace_call, | |
4740974a | 141 | .flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE, |
53614991 SR |
142 | }; |
143 | ||
53614991 SR |
144 | static struct tracer_opt func_opts[] = { |
145 | #ifdef CONFIG_STACKTRACE | |
146 | { TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) }, | |
147 | #endif | |
148 | { } /* Always set a last empty entry */ | |
149 | }; | |
150 | ||
151 | static struct tracer_flags func_flags = { | |
152 | .val = 0, /* By default: all flags disabled */ | |
153 | .opts = func_opts | |
154 | }; | |
155 | ||
a225cdd2 | 156 | static void tracing_start_function_trace(void) |
3eb36aa0 SR |
157 | { |
158 | ftrace_function_enabled = 0; | |
159 | ||
3eb36aa0 SR |
160 | if (func_flags.val & TRACE_FUNC_OPT_STACK) |
161 | register_ftrace_function(&trace_stack_ops); | |
162 | else | |
163 | register_ftrace_function(&trace_ops); | |
164 | ||
165 | ftrace_function_enabled = 1; | |
166 | } | |
167 | ||
a225cdd2 | 168 | static void tracing_stop_function_trace(void) |
3eb36aa0 SR |
169 | { |
170 | ftrace_function_enabled = 0; | |
c85a17e2 FW |
171 | |
172 | if (func_flags.val & TRACE_FUNC_OPT_STACK) | |
173 | unregister_ftrace_function(&trace_stack_ops); | |
174 | else | |
175 | unregister_ftrace_function(&trace_ops); | |
3eb36aa0 SR |
176 | } |
177 | ||
53614991 SR |
178 | static int func_set_flag(u32 old_flags, u32 bit, int set) |
179 | { | |
f555f123 AV |
180 | switch (bit) { |
181 | case TRACE_FUNC_OPT_STACK: | |
53614991 SR |
182 | /* do nothing if already set */ |
183 | if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK)) | |
f555f123 | 184 | break; |
53614991 | 185 | |
3eb36aa0 SR |
186 | if (set) { |
187 | unregister_ftrace_function(&trace_ops); | |
53614991 | 188 | register_ftrace_function(&trace_stack_ops); |
3eb36aa0 | 189 | } else { |
53614991 | 190 | unregister_ftrace_function(&trace_stack_ops); |
3eb36aa0 SR |
191 | register_ftrace_function(&trace_ops); |
192 | } | |
53614991 | 193 | |
f555f123 AV |
194 | break; |
195 | default: | |
196 | return -EINVAL; | |
53614991 SR |
197 | } |
198 | ||
f555f123 | 199 | return 0; |
53614991 SR |
200 | } |
201 | ||
8f768993 | 202 | static struct tracer function_trace __tracer_data = |
1b29b018 | 203 | { |
3eb36aa0 SR |
204 | .name = "function", |
205 | .init = function_trace_init, | |
206 | .reset = function_trace_reset, | |
207 | .start = function_trace_start, | |
6eaaa5d5 | 208 | .wait_pipe = poll_wait_pipe, |
53614991 SR |
209 | .flags = &func_flags, |
210 | .set_flag = func_set_flag, | |
60a11774 | 211 | #ifdef CONFIG_FTRACE_SELFTEST |
3eb36aa0 | 212 | .selftest = trace_selftest_startup_function, |
60a11774 | 213 | #endif |
1b29b018 SR |
214 | }; |
215 | ||
23b4ff3a | 216 | #ifdef CONFIG_DYNAMIC_FTRACE |
1c317143 | 217 | static int update_count(void **data) |
23b4ff3a | 218 | { |
1c317143 | 219 | unsigned long *count = (long *)data; |
23b4ff3a SR |
220 | |
221 | if (!*count) | |
1c317143 | 222 | return 0; |
23b4ff3a SR |
223 | |
224 | if (*count != -1) | |
225 | (*count)--; | |
226 | ||
1c317143 | 227 | return 1; |
23b4ff3a SR |
228 | } |
229 | ||
230 | static void | |
8380d248 | 231 | ftrace_traceon_count(unsigned long ip, unsigned long parent_ip, void **data) |
23b4ff3a | 232 | { |
1c317143 | 233 | if (tracing_is_on()) |
23b4ff3a SR |
234 | return; |
235 | ||
1c317143 SRRH |
236 | if (update_count(data)) |
237 | tracing_on(); | |
238 | } | |
23b4ff3a | 239 | |
1c317143 | 240 | static void |
8380d248 | 241 | ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip, void **data) |
1c317143 SRRH |
242 | { |
243 | if (!tracing_is_on()) | |
244 | return; | |
23b4ff3a | 245 | |
1c317143 SRRH |
246 | if (update_count(data)) |
247 | tracing_off(); | |
23b4ff3a SR |
248 | } |
249 | ||
8380d248 SRRH |
250 | static void |
251 | ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data) | |
252 | { | |
253 | if (tracing_is_on()) | |
254 | return; | |
255 | ||
256 | tracing_on(); | |
257 | } | |
258 | ||
259 | static void | |
260 | ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data) | |
261 | { | |
262 | if (!tracing_is_on()) | |
263 | return; | |
264 | ||
265 | tracing_off(); | |
266 | } | |
267 | ||
dd42cd3e SRRH |
268 | /* |
269 | * Skip 4: | |
270 | * ftrace_stacktrace() | |
271 | * function_trace_probe_call() | |
272 | * ftrace_ops_list_func() | |
273 | * ftrace_call() | |
274 | */ | |
275 | #define STACK_SKIP 4 | |
276 | ||
277 | static void | |
278 | ftrace_stacktrace(unsigned long ip, unsigned long parent_ip, void **data) | |
279 | { | |
280 | trace_dump_stack(STACK_SKIP); | |
281 | } | |
282 | ||
283 | static void | |
284 | ftrace_stacktrace_count(unsigned long ip, unsigned long parent_ip, void **data) | |
285 | { | |
286 | if (!tracing_is_on()) | |
287 | return; | |
288 | ||
289 | if (update_count(data)) | |
290 | trace_dump_stack(STACK_SKIP); | |
291 | } | |
292 | ||
ad71d889 SRRH |
293 | static void |
294 | ftrace_dump_probe(unsigned long ip, unsigned long parent_ip, void **data) | |
295 | { | |
296 | if (update_count(data)) | |
297 | ftrace_dump(DUMP_ALL); | |
298 | } | |
299 | ||
90e3c03c SRRH |
300 | /* Only dump the current CPU buffer. */ |
301 | static void | |
302 | ftrace_cpudump_probe(unsigned long ip, unsigned long parent_ip, void **data) | |
303 | { | |
304 | if (update_count(data)) | |
305 | ftrace_dump(DUMP_ORIG); | |
306 | } | |
307 | ||
e110e3d1 | 308 | static int |
dd42cd3e SRRH |
309 | ftrace_probe_print(const char *name, struct seq_file *m, |
310 | unsigned long ip, void *data) | |
311 | { | |
312 | long count = (long)data; | |
313 | ||
314 | seq_printf(m, "%ps:%s", (void *)ip, name); | |
315 | ||
316 | if (count == -1) | |
317 | seq_printf(m, ":unlimited\n"); | |
318 | else | |
319 | seq_printf(m, ":count=%ld\n", count); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int | |
325 | ftrace_traceon_print(struct seq_file *m, unsigned long ip, | |
326 | struct ftrace_probe_ops *ops, void *data) | |
327 | { | |
328 | return ftrace_probe_print("traceon", m, ip, data); | |
329 | } | |
330 | ||
331 | static int | |
332 | ftrace_traceoff_print(struct seq_file *m, unsigned long ip, | |
333 | struct ftrace_probe_ops *ops, void *data) | |
334 | { | |
335 | return ftrace_probe_print("traceoff", m, ip, data); | |
336 | } | |
337 | ||
338 | static int | |
339 | ftrace_stacktrace_print(struct seq_file *m, unsigned long ip, | |
340 | struct ftrace_probe_ops *ops, void *data) | |
341 | { | |
342 | return ftrace_probe_print("stacktrace", m, ip, data); | |
343 | } | |
e110e3d1 | 344 | |
ad71d889 SRRH |
345 | static int |
346 | ftrace_dump_print(struct seq_file *m, unsigned long ip, | |
347 | struct ftrace_probe_ops *ops, void *data) | |
348 | { | |
349 | return ftrace_probe_print("dump", m, ip, data); | |
350 | } | |
351 | ||
90e3c03c SRRH |
352 | static int |
353 | ftrace_cpudump_print(struct seq_file *m, unsigned long ip, | |
354 | struct ftrace_probe_ops *ops, void *data) | |
355 | { | |
356 | return ftrace_probe_print("cpudump", m, ip, data); | |
357 | } | |
358 | ||
8380d248 SRRH |
359 | static struct ftrace_probe_ops traceon_count_probe_ops = { |
360 | .func = ftrace_traceon_count, | |
dd42cd3e | 361 | .print = ftrace_traceon_print, |
8380d248 SRRH |
362 | }; |
363 | ||
364 | static struct ftrace_probe_ops traceoff_count_probe_ops = { | |
365 | .func = ftrace_traceoff_count, | |
dd42cd3e SRRH |
366 | .print = ftrace_traceoff_print, |
367 | }; | |
368 | ||
369 | static struct ftrace_probe_ops stacktrace_count_probe_ops = { | |
370 | .func = ftrace_stacktrace_count, | |
371 | .print = ftrace_stacktrace_print, | |
8380d248 SRRH |
372 | }; |
373 | ||
ad71d889 SRRH |
374 | static struct ftrace_probe_ops dump_probe_ops = { |
375 | .func = ftrace_dump_probe, | |
376 | .print = ftrace_dump_print, | |
377 | }; | |
378 | ||
90e3c03c SRRH |
379 | static struct ftrace_probe_ops cpudump_probe_ops = { |
380 | .func = ftrace_cpudump_probe, | |
381 | .print = ftrace_cpudump_print, | |
382 | }; | |
383 | ||
b6887d79 | 384 | static struct ftrace_probe_ops traceon_probe_ops = { |
23b4ff3a | 385 | .func = ftrace_traceon, |
dd42cd3e | 386 | .print = ftrace_traceon_print, |
23b4ff3a SR |
387 | }; |
388 | ||
b6887d79 | 389 | static struct ftrace_probe_ops traceoff_probe_ops = { |
23b4ff3a | 390 | .func = ftrace_traceoff, |
dd42cd3e | 391 | .print = ftrace_traceoff_print, |
23b4ff3a SR |
392 | }; |
393 | ||
dd42cd3e SRRH |
394 | static struct ftrace_probe_ops stacktrace_probe_ops = { |
395 | .func = ftrace_stacktrace, | |
396 | .print = ftrace_stacktrace_print, | |
397 | }; | |
e110e3d1 | 398 | |
23b4ff3a | 399 | static int |
dd42cd3e SRRH |
400 | ftrace_trace_probe_callback(struct ftrace_probe_ops *ops, |
401 | struct ftrace_hash *hash, char *glob, | |
402 | char *cmd, char *param, int enable) | |
23b4ff3a | 403 | { |
23b4ff3a SR |
404 | void *count = (void *)-1; |
405 | char *number; | |
406 | int ret; | |
407 | ||
408 | /* hash funcs only work with set_ftrace_filter */ | |
409 | if (!enable) | |
410 | return -EINVAL; | |
411 | ||
8b8fa62c SRRH |
412 | if (glob[0] == '!') { |
413 | unregister_ftrace_function_probe_func(glob+1, ops); | |
414 | return 0; | |
415 | } | |
416 | ||
23b4ff3a SR |
417 | if (!param) |
418 | goto out_reg; | |
419 | ||
420 | number = strsep(¶m, ":"); | |
421 | ||
422 | if (!strlen(number)) | |
423 | goto out_reg; | |
424 | ||
425 | /* | |
426 | * We use the callback data field (which is a pointer) | |
427 | * as our counter. | |
428 | */ | |
bcd83ea6 | 429 | ret = kstrtoul(number, 0, (unsigned long *)&count); |
23b4ff3a SR |
430 | if (ret) |
431 | return ret; | |
432 | ||
433 | out_reg: | |
b6887d79 | 434 | ret = register_ftrace_function_probe(glob, ops, count); |
23b4ff3a | 435 | |
04aef32d | 436 | return ret < 0 ? ret : 0; |
23b4ff3a SR |
437 | } |
438 | ||
dd42cd3e SRRH |
439 | static int |
440 | ftrace_trace_onoff_callback(struct ftrace_hash *hash, | |
441 | char *glob, char *cmd, char *param, int enable) | |
442 | { | |
443 | struct ftrace_probe_ops *ops; | |
444 | ||
445 | /* we register both traceon and traceoff to this callback */ | |
446 | if (strcmp(cmd, "traceon") == 0) | |
447 | ops = param ? &traceon_count_probe_ops : &traceon_probe_ops; | |
448 | else | |
449 | ops = param ? &traceoff_count_probe_ops : &traceoff_probe_ops; | |
450 | ||
451 | return ftrace_trace_probe_callback(ops, hash, glob, cmd, | |
452 | param, enable); | |
453 | } | |
454 | ||
455 | static int | |
456 | ftrace_stacktrace_callback(struct ftrace_hash *hash, | |
457 | char *glob, char *cmd, char *param, int enable) | |
458 | { | |
459 | struct ftrace_probe_ops *ops; | |
460 | ||
461 | ops = param ? &stacktrace_count_probe_ops : &stacktrace_probe_ops; | |
462 | ||
463 | return ftrace_trace_probe_callback(ops, hash, glob, cmd, | |
464 | param, enable); | |
465 | } | |
466 | ||
ad71d889 SRRH |
467 | static int |
468 | ftrace_dump_callback(struct ftrace_hash *hash, | |
469 | char *glob, char *cmd, char *param, int enable) | |
470 | { | |
471 | struct ftrace_probe_ops *ops; | |
472 | ||
473 | ops = &dump_probe_ops; | |
474 | ||
475 | /* Only dump once. */ | |
476 | return ftrace_trace_probe_callback(ops, hash, glob, cmd, | |
477 | "1", enable); | |
478 | } | |
479 | ||
90e3c03c SRRH |
480 | static int |
481 | ftrace_cpudump_callback(struct ftrace_hash *hash, | |
482 | char *glob, char *cmd, char *param, int enable) | |
483 | { | |
484 | struct ftrace_probe_ops *ops; | |
485 | ||
486 | ops = &cpudump_probe_ops; | |
487 | ||
488 | /* Only dump once. */ | |
489 | return ftrace_trace_probe_callback(ops, hash, glob, cmd, | |
490 | "1", enable); | |
491 | } | |
492 | ||
23b4ff3a SR |
493 | static struct ftrace_func_command ftrace_traceon_cmd = { |
494 | .name = "traceon", | |
495 | .func = ftrace_trace_onoff_callback, | |
496 | }; | |
497 | ||
498 | static struct ftrace_func_command ftrace_traceoff_cmd = { | |
499 | .name = "traceoff", | |
500 | .func = ftrace_trace_onoff_callback, | |
501 | }; | |
502 | ||
dd42cd3e SRRH |
503 | static struct ftrace_func_command ftrace_stacktrace_cmd = { |
504 | .name = "stacktrace", | |
505 | .func = ftrace_stacktrace_callback, | |
506 | }; | |
507 | ||
ad71d889 SRRH |
508 | static struct ftrace_func_command ftrace_dump_cmd = { |
509 | .name = "dump", | |
510 | .func = ftrace_dump_callback, | |
511 | }; | |
512 | ||
90e3c03c SRRH |
513 | static struct ftrace_func_command ftrace_cpudump_cmd = { |
514 | .name = "cpudump", | |
515 | .func = ftrace_cpudump_callback, | |
516 | }; | |
517 | ||
23b4ff3a SR |
518 | static int __init init_func_cmd_traceon(void) |
519 | { | |
520 | int ret; | |
521 | ||
522 | ret = register_ftrace_command(&ftrace_traceoff_cmd); | |
523 | if (ret) | |
524 | return ret; | |
525 | ||
526 | ret = register_ftrace_command(&ftrace_traceon_cmd); | |
527 | if (ret) | |
ad71d889 | 528 | goto out_free_traceoff; |
dd42cd3e SRRH |
529 | |
530 | ret = register_ftrace_command(&ftrace_stacktrace_cmd); | |
ad71d889 SRRH |
531 | if (ret) |
532 | goto out_free_traceon; | |
533 | ||
534 | ret = register_ftrace_command(&ftrace_dump_cmd); | |
535 | if (ret) | |
536 | goto out_free_stacktrace; | |
537 | ||
90e3c03c SRRH |
538 | ret = register_ftrace_command(&ftrace_cpudump_cmd); |
539 | if (ret) | |
540 | goto out_free_dump; | |
541 | ||
ad71d889 SRRH |
542 | return 0; |
543 | ||
90e3c03c SRRH |
544 | out_free_dump: |
545 | unregister_ftrace_command(&ftrace_dump_cmd); | |
ad71d889 SRRH |
546 | out_free_stacktrace: |
547 | unregister_ftrace_command(&ftrace_stacktrace_cmd); | |
548 | out_free_traceon: | |
549 | unregister_ftrace_command(&ftrace_traceon_cmd); | |
550 | out_free_traceoff: | |
551 | unregister_ftrace_command(&ftrace_traceoff_cmd); | |
552 | ||
23b4ff3a SR |
553 | return ret; |
554 | } | |
555 | #else | |
556 | static inline int init_func_cmd_traceon(void) | |
557 | { | |
558 | return 0; | |
559 | } | |
560 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
561 | ||
1b29b018 SR |
562 | static __init int init_function_trace(void) |
563 | { | |
23b4ff3a | 564 | init_func_cmd_traceon(); |
1b29b018 SR |
565 | return register_tracer(&function_trace); |
566 | } | |
6f415672 | 567 | core_initcall(init_function_trace); |