Commit | Line | Data |
---|---|---|
abaff32a | 1 | /* |
bf9e1876 IM |
2 | * builtin-record.c |
3 | * | |
4 | * Builtin record command: Record the profile of a workload | |
5 | * (or a CPU, or a PID) into the perf.data output file - for | |
6 | * later analysis via perf report. | |
abaff32a | 7 | */ |
b8f46c5a XG |
8 | #define _FILE_OFFSET_BITS 64 |
9 | ||
16f762a2 | 10 | #include "builtin.h" |
bf9e1876 IM |
11 | |
12 | #include "perf.h" | |
13 | ||
6122e4e4 | 14 | #include "util/build-id.h" |
6eda5838 | 15 | #include "util/util.h" |
0e9b20b8 | 16 | #include "util/parse-options.h" |
8ad8db37 | 17 | #include "util/parse-events.h" |
6eda5838 | 18 | |
7c6a1c65 | 19 | #include "util/header.h" |
66e274f3 | 20 | #include "util/event.h" |
8f28827a | 21 | #include "util/debug.h" |
94c744b6 | 22 | #include "util/session.h" |
8d06367f | 23 | #include "util/symbol.h" |
a12b51c4 | 24 | #include "util/cpumap.h" |
7c6a1c65 | 25 | |
97124d5e | 26 | #include <unistd.h> |
de9ac07b | 27 | #include <sched.h> |
a41794cd | 28 | #include <sys/mman.h> |
de9ac07b | 29 | |
7865e817 FW |
30 | enum write_mode_t { |
31 | WRITE_FORCE, | |
32 | WRITE_APPEND | |
33 | }; | |
34 | ||
d6d901c2 | 35 | static int *fd[MAX_NR_CPUS][MAX_COUNTERS]; |
a21ca2ca | 36 | |
3de29cab SE |
37 | static u64 user_interval = ULLONG_MAX; |
38 | static u64 default_interval = 0; | |
a21ca2ca | 39 | |
42e59d7d | 40 | static int nr_cpus = 0; |
de9ac07b | 41 | static unsigned int page_size; |
42e59d7d | 42 | static unsigned int mmap_pages = 128; |
f9212819 | 43 | static unsigned int user_freq = UINT_MAX; |
42e59d7d | 44 | static int freq = 1000; |
de9ac07b | 45 | static int output; |
529870e3 | 46 | static int pipe_output = 0; |
23ac9cbe | 47 | static const char *output_name = "perf.data"; |
42e59d7d | 48 | static int group = 0; |
1967936d | 49 | static int realtime_prio = 0; |
c0555642 IM |
50 | static bool raw_samples = false; |
51 | static bool system_wide = false; | |
42e59d7d IM |
52 | static int profile_cpu = -1; |
53 | static pid_t target_pid = -1; | |
d6d901c2 ZY |
54 | static pid_t target_tid = -1; |
55 | static pid_t *all_tids = NULL; | |
56 | static int thread_num = 0; | |
42e59d7d | 57 | static pid_t child_pid = -1; |
2e6cdf99 | 58 | static bool no_inherit = false; |
7865e817 | 59 | static enum write_mode_t write_mode = WRITE_FORCE; |
c0555642 IM |
60 | static bool call_graph = false; |
61 | static bool inherit_stat = false; | |
62 | static bool no_samples = false; | |
63 | static bool sample_address = false; | |
64 | static bool multiplex = false; | |
42e59d7d IM |
65 | static int multiplex_fd = -1; |
66 | ||
67 | static long samples = 0; | |
a21ca2ca IM |
68 | static struct timeval last_read; |
69 | static struct timeval this_read; | |
70 | ||
42e59d7d | 71 | static u64 bytes_written = 0; |
a21ca2ca | 72 | |
d6d901c2 | 73 | static struct pollfd *event_array; |
a21ca2ca | 74 | |
42e59d7d IM |
75 | static int nr_poll = 0; |
76 | static int nr_cpu = 0; | |
a21ca2ca | 77 | |
42e59d7d | 78 | static int file_new = 1; |
6122e4e4 | 79 | static off_t post_processing_offset; |
7c6a1c65 | 80 | |
94c744b6 | 81 | static struct perf_session *session; |
f5970550 | 82 | |
de9ac07b | 83 | struct mmap_data { |
a21ca2ca IM |
84 | int counter; |
85 | void *base; | |
86 | unsigned int mask; | |
87 | unsigned int prev; | |
de9ac07b PZ |
88 | }; |
89 | ||
d6d901c2 | 90 | static struct mmap_data *mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; |
a21ca2ca | 91 | |
9d91a6f7 | 92 | static unsigned long mmap_read_head(struct mmap_data *md) |
de9ac07b | 93 | { |
cdd6c482 | 94 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 | 95 | long head; |
de9ac07b PZ |
96 | |
97 | head = pc->data_head; | |
98 | rmb(); | |
99 | ||
100 | return head; | |
101 | } | |
102 | ||
9d91a6f7 PZ |
103 | static void mmap_write_tail(struct mmap_data *md, unsigned long tail) |
104 | { | |
cdd6c482 | 105 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 PZ |
106 | |
107 | /* | |
108 | * ensure all reads are done before we write the tail out. | |
109 | */ | |
110 | /* mb(); */ | |
111 | pc->data_tail = tail; | |
112 | } | |
113 | ||
9215545e TZ |
114 | static void advance_output(size_t size) |
115 | { | |
116 | bytes_written += size; | |
117 | } | |
118 | ||
f5970550 PZ |
119 | static void write_output(void *buf, size_t size) |
120 | { | |
121 | while (size) { | |
122 | int ret = write(output, buf, size); | |
123 | ||
124 | if (ret < 0) | |
125 | die("failed to write"); | |
126 | ||
127 | size -= ret; | |
128 | buf += ret; | |
129 | ||
130 | bytes_written += ret; | |
131 | } | |
132 | } | |
133 | ||
d8f66248 ACM |
134 | static int process_synthesized_event(event_t *event, |
135 | struct perf_session *self __used) | |
234fbbf5 | 136 | { |
6122e4e4 | 137 | write_output(event, event->header.size); |
234fbbf5 ACM |
138 | return 0; |
139 | } | |
140 | ||
de9ac07b PZ |
141 | static void mmap_read(struct mmap_data *md) |
142 | { | |
143 | unsigned int head = mmap_read_head(md); | |
144 | unsigned int old = md->prev; | |
145 | unsigned char *data = md->base + page_size; | |
146 | unsigned long size; | |
147 | void *buf; | |
148 | int diff; | |
149 | ||
150 | gettimeofday(&this_read, NULL); | |
151 | ||
152 | /* | |
153 | * If we're further behind than half the buffer, there's a chance | |
2debbc83 | 154 | * the writer will bite our tail and mess up the samples under us. |
de9ac07b PZ |
155 | * |
156 | * If we somehow ended up ahead of the head, we got messed up. | |
157 | * | |
158 | * In either case, truncate and restart at head. | |
159 | */ | |
160 | diff = head - old; | |
9d91a6f7 | 161 | if (diff < 0) { |
de9ac07b PZ |
162 | struct timeval iv; |
163 | unsigned long msecs; | |
164 | ||
165 | timersub(&this_read, &last_read, &iv); | |
166 | msecs = iv.tv_sec*1000 + iv.tv_usec/1000; | |
167 | ||
168 | fprintf(stderr, "WARNING: failed to keep up with mmap data." | |
169 | " Last read %lu msecs ago.\n", msecs); | |
170 | ||
171 | /* | |
172 | * head points to a known good entry, start there. | |
173 | */ | |
174 | old = head; | |
175 | } | |
176 | ||
177 | last_read = this_read; | |
178 | ||
179 | if (old != head) | |
2debbc83 | 180 | samples++; |
de9ac07b PZ |
181 | |
182 | size = head - old; | |
183 | ||
184 | if ((old & md->mask) + size != (head & md->mask)) { | |
185 | buf = &data[old & md->mask]; | |
186 | size = md->mask + 1 - (old & md->mask); | |
187 | old += size; | |
021e9f47 | 188 | |
6122e4e4 | 189 | write_output(buf, size); |
de9ac07b PZ |
190 | } |
191 | ||
192 | buf = &data[old & md->mask]; | |
193 | size = head - old; | |
194 | old += size; | |
021e9f47 | 195 | |
6122e4e4 | 196 | write_output(buf, size); |
de9ac07b PZ |
197 | |
198 | md->prev = old; | |
9d91a6f7 | 199 | mmap_write_tail(md, old); |
de9ac07b PZ |
200 | } |
201 | ||
202 | static volatile int done = 0; | |
f7b7c26e | 203 | static volatile int signr = -1; |
de9ac07b | 204 | |
16c8a109 | 205 | static void sig_handler(int sig) |
de9ac07b | 206 | { |
16c8a109 | 207 | done = 1; |
f7b7c26e PZ |
208 | signr = sig; |
209 | } | |
210 | ||
211 | static void sig_atexit(void) | |
212 | { | |
933da83a CW |
213 | if (child_pid != -1) |
214 | kill(child_pid, SIGTERM); | |
215 | ||
f7b7c26e PZ |
216 | if (signr == -1) |
217 | return; | |
218 | ||
219 | signal(signr, SIG_DFL); | |
220 | kill(getpid(), signr); | |
de9ac07b PZ |
221 | } |
222 | ||
f250c030 IM |
223 | static int group_fd; |
224 | ||
cdd6c482 | 225 | static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) |
7c6a1c65 PZ |
226 | { |
227 | struct perf_header_attr *h_attr; | |
228 | ||
94c744b6 ACM |
229 | if (nr < session->header.attrs) { |
230 | h_attr = session->header.attr[nr]; | |
7c6a1c65 PZ |
231 | } else { |
232 | h_attr = perf_header_attr__new(a); | |
dc79c0fc | 233 | if (h_attr != NULL) |
94c744b6 | 234 | if (perf_header__add_attr(&session->header, h_attr) < 0) { |
11deb1f9 ACM |
235 | perf_header_attr__delete(h_attr); |
236 | h_attr = NULL; | |
237 | } | |
7c6a1c65 PZ |
238 | } |
239 | ||
240 | return h_attr; | |
241 | } | |
242 | ||
d6d901c2 | 243 | static void create_counter(int counter, int cpu) |
de9ac07b | 244 | { |
c171b552 | 245 | char *filter = filters[counter]; |
cdd6c482 | 246 | struct perf_event_attr *attr = attrs + counter; |
7c6a1c65 PZ |
247 | struct perf_header_attr *h_attr; |
248 | int track = !counter; /* only the first counter needs these */ | |
d6d901c2 | 249 | int thread_index; |
c171b552 | 250 | int ret; |
7c6a1c65 PZ |
251 | struct { |
252 | u64 count; | |
253 | u64 time_enabled; | |
254 | u64 time_running; | |
255 | u64 id; | |
256 | } read_data; | |
257 | ||
258 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
259 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
260 | PERF_FORMAT_ID; | |
16c8a109 | 261 | |
3a9f131f | 262 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 263 | |
8907fd60 EM |
264 | if (nr_counters > 1) |
265 | attr->sample_type |= PERF_SAMPLE_ID; | |
266 | ||
f9212819 FW |
267 | /* |
268 | * We default some events to a 1 default interval. But keep | |
269 | * it a weak assumption overridable by the user. | |
270 | */ | |
271 | if (!attr->sample_period || (user_freq != UINT_MAX && | |
3de29cab | 272 | user_interval != ULLONG_MAX)) { |
f9212819 FW |
273 | if (freq) { |
274 | attr->sample_type |= PERF_SAMPLE_PERIOD; | |
275 | attr->freq = 1; | |
276 | attr->sample_freq = freq; | |
277 | } else { | |
278 | attr->sample_period = default_interval; | |
279 | } | |
1dba15e7 | 280 | } |
3efa1cc9 | 281 | |
649c48a9 PZ |
282 | if (no_samples) |
283 | attr->sample_freq = 0; | |
284 | ||
285 | if (inherit_stat) | |
286 | attr->inherit_stat = 1; | |
287 | ||
4bba828d AB |
288 | if (sample_address) |
289 | attr->sample_type |= PERF_SAMPLE_ADDR; | |
290 | ||
3efa1cc9 IM |
291 | if (call_graph) |
292 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
293 | ||
cd6feeea | 294 | if (raw_samples) { |
6ddf259d | 295 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 296 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
297 | attr->sample_type |= PERF_SAMPLE_CPU; |
298 | } | |
f413cdb8 | 299 | |
a21ca2ca IM |
300 | attr->mmap = track; |
301 | attr->comm = track; | |
2e6cdf99 SE |
302 | attr->inherit = !no_inherit; |
303 | if (target_pid == -1 && target_tid == -1 && !system_wide) { | |
46be604b | 304 | attr->disabled = 1; |
bedbfdea | 305 | attr->enable_on_exec = 1; |
46be604b | 306 | } |
bedbfdea | 307 | |
d6d901c2 | 308 | for (thread_index = 0; thread_index < thread_num; thread_index++) { |
3da297a6 | 309 | try_again: |
d6d901c2 ZY |
310 | fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr, |
311 | all_tids[thread_index], cpu, group_fd, 0); | |
312 | ||
313 | if (fd[nr_cpu][counter][thread_index] < 0) { | |
314 | int err = errno; | |
315 | ||
316 | if (err == EPERM || err == EACCES) | |
317 | die("Permission error - are you root?\n" | |
318 | "\t Consider tweaking" | |
319 | " /proc/sys/kernel/perf_event_paranoid.\n"); | |
320 | else if (err == ENODEV && profile_cpu != -1) { | |
321 | die("No such device - did you specify" | |
322 | " an out-of-range profile CPU?\n"); | |
323 | } | |
3da297a6 | 324 | |
d6d901c2 ZY |
325 | /* |
326 | * If it's cycles then fall back to hrtimer | |
327 | * based cpu-clock-tick sw counter, which | |
328 | * is always available even if no PMU support: | |
329 | */ | |
330 | if (attr->type == PERF_TYPE_HARDWARE | |
331 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { | |
332 | ||
333 | if (verbose) | |
334 | warning(" ... trying to fall back to cpu-clock-ticks\n"); | |
335 | attr->type = PERF_TYPE_SOFTWARE; | |
336 | attr->config = PERF_COUNT_SW_CPU_CLOCK; | |
337 | goto try_again; | |
338 | } | |
339 | printf("\n"); | |
340 | error("perfcounter syscall returned with %d (%s)\n", | |
341 | fd[nr_cpu][counter][thread_index], strerror(err)); | |
bfd45118 SK |
342 | |
343 | #if defined(__i386__) || defined(__x86_64__) | |
d6d901c2 ZY |
344 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
345 | die("No hardware sampling interrupt available." | |
346 | " No APIC? If so then you can boot the kernel" | |
347 | " with the \"lapic\" boot parameter to" | |
348 | " force-enable it.\n"); | |
bfd45118 SK |
349 | #endif |
350 | ||
d6d901c2 ZY |
351 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
352 | exit(-1); | |
353 | } | |
3da297a6 | 354 | |
d6d901c2 ZY |
355 | h_attr = get_header_attr(attr, counter); |
356 | if (h_attr == NULL) | |
357 | die("nomem\n"); | |
7c6a1c65 | 358 | |
d6d901c2 ZY |
359 | if (!file_new) { |
360 | if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { | |
361 | fprintf(stderr, "incompatible append\n"); | |
362 | exit(-1); | |
363 | } | |
7c6a1c65 | 364 | } |
7c6a1c65 | 365 | |
d6d901c2 ZY |
366 | if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) { |
367 | perror("Unable to read perf file descriptor\n"); | |
368 | exit(-1); | |
369 | } | |
7c6a1c65 | 370 | |
d6d901c2 ZY |
371 | if (perf_header_attr__add_id(h_attr, read_data.id) < 0) { |
372 | pr_warning("Not enough memory to add id\n"); | |
373 | exit(-1); | |
374 | } | |
7c6a1c65 | 375 | |
d6d901c2 ZY |
376 | assert(fd[nr_cpu][counter][thread_index] >= 0); |
377 | fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK); | |
16c8a109 | 378 | |
d6d901c2 ZY |
379 | /* |
380 | * First counter acts as the group leader: | |
381 | */ | |
382 | if (group && group_fd == -1) | |
383 | group_fd = fd[nr_cpu][counter][thread_index]; | |
384 | if (multiplex && multiplex_fd == -1) | |
385 | multiplex_fd = fd[nr_cpu][counter][thread_index]; | |
f250c030 | 386 | |
d6d901c2 | 387 | if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) { |
4502d77c | 388 | |
d6d901c2 ZY |
389 | ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd); |
390 | assert(ret != -1); | |
391 | } else { | |
392 | event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index]; | |
393 | event_array[nr_poll].events = POLLIN; | |
394 | nr_poll++; | |
395 | ||
396 | mmap_array[nr_cpu][counter][thread_index].counter = counter; | |
397 | mmap_array[nr_cpu][counter][thread_index].prev = 0; | |
398 | mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1; | |
399 | mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size, | |
400 | PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0); | |
401 | if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) { | |
402 | error("failed to mmap with %d (%s)\n", errno, strerror(errno)); | |
403 | exit(-1); | |
404 | } | |
ea57c4f5 | 405 | } |
d1302522 | 406 | |
d6d901c2 ZY |
407 | if (filter != NULL) { |
408 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
409 | PERF_EVENT_IOC_SET_FILTER, filter); | |
410 | if (ret) { | |
411 | error("failed to set filter with %d (%s)\n", errno, | |
412 | strerror(errno)); | |
413 | exit(-1); | |
414 | } | |
c171b552 LZ |
415 | } |
416 | } | |
f250c030 | 417 | } |
f2521b6e | 418 | |
d6d901c2 | 419 | static void open_counters(int cpu) |
f250c030 IM |
420 | { |
421 | int counter; | |
16c8a109 | 422 | |
f250c030 IM |
423 | group_fd = -1; |
424 | for (counter = 0; counter < nr_counters; counter++) | |
d6d901c2 | 425 | create_counter(counter, cpu); |
f250c030 | 426 | |
16c8a109 PZ |
427 | nr_cpu++; |
428 | } | |
429 | ||
6122e4e4 ACM |
430 | static int process_buildids(void) |
431 | { | |
432 | u64 size = lseek(output, 0, SEEK_CUR); | |
433 | ||
9f591fd7 ACM |
434 | if (size == 0) |
435 | return 0; | |
436 | ||
6122e4e4 ACM |
437 | session->fd = output; |
438 | return __perf_session__process_events(session, post_processing_offset, | |
439 | size - post_processing_offset, | |
440 | size, &build_id__mark_dso_hit_ops); | |
441 | } | |
442 | ||
f5970550 PZ |
443 | static void atexit_header(void) |
444 | { | |
c7929e47 TZ |
445 | if (!pipe_output) { |
446 | session->header.data_size += bytes_written; | |
f5970550 | 447 | |
c7929e47 TZ |
448 | process_buildids(); |
449 | perf_header__write(&session->header, output, true); | |
c7929e47 | 450 | } |
f5970550 PZ |
451 | } |
452 | ||
23346f21 | 453 | static void event__synthesize_guest_os(struct machine *machine, void *data) |
a1645ce1 ZY |
454 | { |
455 | int err; | |
456 | char *guest_kallsyms; | |
457 | char path[PATH_MAX]; | |
23346f21 | 458 | struct perf_session *psession = data; |
a1645ce1 | 459 | |
23346f21 | 460 | if (machine__is_host(machine)) |
a1645ce1 ZY |
461 | return; |
462 | ||
463 | /* | |
464 | *As for guest kernel when processing subcommand record&report, | |
465 | *we arrange module mmap prior to guest kernel mmap and trigger | |
466 | *a preload dso because default guest module symbols are loaded | |
467 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This | |
468 | *method is used to avoid symbol missing when the first addr is | |
469 | *in module instead of in guest kernel. | |
470 | */ | |
471 | err = event__synthesize_modules(process_synthesized_event, | |
23346f21 | 472 | psession, machine); |
a1645ce1 ZY |
473 | if (err < 0) |
474 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 475 | " relocation symbol.\n", machine->pid); |
a1645ce1 | 476 | |
23346f21 | 477 | if (machine__is_default_guest(machine)) |
a1645ce1 ZY |
478 | guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms; |
479 | else { | |
23346f21 | 480 | sprintf(path, "%s/proc/kallsyms", machine->root_dir); |
a1645ce1 ZY |
481 | guest_kallsyms = path; |
482 | } | |
483 | ||
484 | /* | |
485 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms | |
486 | * have no _text sometimes. | |
487 | */ | |
488 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 489 | psession, machine, "_text"); |
a1645ce1 ZY |
490 | if (err < 0) |
491 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 492 | psession, machine, "_stext"); |
a1645ce1 ZY |
493 | if (err < 0) |
494 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 495 | " relocation symbol.\n", machine->pid); |
a1645ce1 ZY |
496 | } |
497 | ||
98402807 FW |
498 | static struct perf_event_header finished_round_event = { |
499 | .size = sizeof(struct perf_event_header), | |
500 | .type = PERF_RECORD_FINISHED_ROUND, | |
501 | }; | |
502 | ||
503 | static void mmap_read_all(void) | |
504 | { | |
505 | int i, counter, thread; | |
506 | ||
507 | for (i = 0; i < nr_cpu; i++) { | |
508 | for (counter = 0; counter < nr_counters; counter++) { | |
509 | for (thread = 0; thread < thread_num; thread++) { | |
510 | if (mmap_array[i][counter][thread].base) | |
511 | mmap_read(&mmap_array[i][counter][thread]); | |
512 | } | |
513 | ||
514 | } | |
515 | } | |
516 | ||
517 | if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) | |
518 | write_output(&finished_round_event, sizeof(finished_round_event)); | |
519 | } | |
520 | ||
d4db3f16 | 521 | static int __cmd_record(int argc, const char **argv) |
16c8a109 PZ |
522 | { |
523 | int i, counter; | |
abaff32a | 524 | struct stat st; |
7c6a1c65 | 525 | pid_t pid = 0; |
abaff32a | 526 | int flags; |
4dc0a04b | 527 | int err; |
8b412664 | 528 | unsigned long waking = 0; |
856e9660 | 529 | int child_ready_pipe[2], go_pipe[2]; |
46be604b | 530 | const bool forks = argc > 0; |
856e9660 | 531 | char buf; |
23346f21 | 532 | struct machine *machine; |
de9ac07b PZ |
533 | |
534 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b | 535 | |
f5970550 PZ |
536 | atexit(sig_atexit); |
537 | signal(SIGCHLD, sig_handler); | |
538 | signal(SIGINT, sig_handler); | |
539 | ||
d4db3f16 | 540 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
856e9660 PZ |
541 | perror("failed to create pipes"); |
542 | exit(-1); | |
543 | } | |
544 | ||
529870e3 TZ |
545 | if (!strcmp(output_name, "-")) |
546 | pipe_output = 1; | |
547 | else if (!stat(output_name, &st) && st.st_size) { | |
7865e817 | 548 | if (write_mode == WRITE_FORCE) { |
b38d3464 ACM |
549 | char oldname[PATH_MAX]; |
550 | snprintf(oldname, sizeof(oldname), "%s.old", | |
551 | output_name); | |
552 | unlink(oldname); | |
553 | rename(output_name, oldname); | |
266e0e21 | 554 | } |
7865e817 FW |
555 | } else if (write_mode == WRITE_APPEND) { |
556 | write_mode = WRITE_FORCE; | |
97124d5e PZ |
557 | } |
558 | ||
f887f301 | 559 | flags = O_CREAT|O_RDWR; |
7865e817 | 560 | if (write_mode == WRITE_APPEND) |
f5970550 | 561 | file_new = 0; |
abaff32a IM |
562 | else |
563 | flags |= O_TRUNC; | |
564 | ||
529870e3 TZ |
565 | if (pipe_output) |
566 | output = STDOUT_FILENO; | |
567 | else | |
568 | output = open(output_name, flags, S_IRUSR | S_IWUSR); | |
de9ac07b PZ |
569 | if (output < 0) { |
570 | perror("failed to create output file"); | |
571 | exit(-1); | |
572 | } | |
573 | ||
7865e817 | 574 | session = perf_session__new(output_name, O_WRONLY, |
454c407e | 575 | write_mode == WRITE_FORCE, false); |
94c744b6 | 576 | if (session == NULL) { |
a9a70bbc ACM |
577 | pr_err("Not enough memory for reading perf file header\n"); |
578 | return -1; | |
579 | } | |
580 | ||
4dc0a04b | 581 | if (!file_new) { |
8dc58101 | 582 | err = perf_header__read(session, output); |
4dc0a04b ACM |
583 | if (err < 0) |
584 | return err; | |
585 | } | |
586 | ||
db620b1c | 587 | if (have_tracepoints(attrs, nr_counters)) |
94c744b6 | 588 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
03456a15 | 589 | |
f5970550 PZ |
590 | atexit(atexit_header); |
591 | ||
d4db3f16 | 592 | if (forks) { |
46be604b | 593 | child_pid = fork(); |
856e9660 PZ |
594 | if (pid < 0) { |
595 | perror("failed to fork"); | |
596 | exit(-1); | |
597 | } | |
7c6a1c65 | 598 | |
46be604b | 599 | if (!child_pid) { |
529870e3 TZ |
600 | if (pipe_output) |
601 | dup2(2, 1); | |
856e9660 PZ |
602 | close(child_ready_pipe[0]); |
603 | close(go_pipe[1]); | |
604 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
605 | ||
606 | /* | |
607 | * Do a dummy execvp to get the PLT entry resolved, | |
608 | * so we avoid the resolver overhead on the real | |
609 | * execvp call. | |
610 | */ | |
611 | execvp("", (char **)argv); | |
612 | ||
613 | /* | |
614 | * Tell the parent we're ready to go | |
615 | */ | |
616 | close(child_ready_pipe[1]); | |
617 | ||
618 | /* | |
619 | * Wait until the parent tells us to go. | |
620 | */ | |
621 | if (read(go_pipe[0], &buf, 1) == -1) | |
622 | perror("unable to read pipe"); | |
623 | ||
624 | execvp(argv[0], (char **)argv); | |
625 | ||
626 | perror(argv[0]); | |
627 | exit(-1); | |
0a5ac846 | 628 | } |
856e9660 | 629 | |
d6d901c2 ZY |
630 | if (!system_wide && target_tid == -1 && target_pid == -1) |
631 | all_tids[0] = child_pid; | |
632 | ||
856e9660 PZ |
633 | close(child_ready_pipe[1]); |
634 | close(go_pipe[0]); | |
635 | /* | |
636 | * wait for child to settle | |
637 | */ | |
638 | if (read(child_ready_pipe[0], &buf, 1) == -1) { | |
639 | perror("unable to read pipe"); | |
640 | exit(-1); | |
641 | } | |
642 | close(child_ready_pipe[0]); | |
643 | } | |
644 | ||
2e6cdf99 | 645 | if ((!system_wide && no_inherit) || profile_cpu != -1) { |
d6d901c2 | 646 | open_counters(profile_cpu); |
856e9660 | 647 | } else { |
a12b51c4 | 648 | nr_cpus = read_cpu_map(); |
856e9660 | 649 | for (i = 0; i < nr_cpus; i++) |
d6d901c2 | 650 | open_counters(cpumap[i]); |
0a5ac846 | 651 | } |
de9ac07b | 652 | |
529870e3 TZ |
653 | if (pipe_output) { |
654 | err = perf_header__write_pipe(output); | |
655 | if (err < 0) | |
656 | return err; | |
657 | } else if (file_new) { | |
94c744b6 | 658 | err = perf_header__write(&session->header, output, false); |
d5eed904 ACM |
659 | if (err < 0) |
660 | return err; | |
56b03f3c ACM |
661 | } |
662 | ||
6122e4e4 ACM |
663 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
664 | ||
2c46dbb5 TZ |
665 | if (pipe_output) { |
666 | err = event__synthesize_attrs(&session->header, | |
667 | process_synthesized_event, | |
668 | session); | |
669 | if (err < 0) { | |
670 | pr_err("Couldn't synthesize attrs.\n"); | |
671 | return err; | |
672 | } | |
cd19a035 TZ |
673 | |
674 | err = event__synthesize_event_types(process_synthesized_event, | |
675 | session); | |
676 | if (err < 0) { | |
677 | pr_err("Couldn't synthesize event_types.\n"); | |
678 | return err; | |
679 | } | |
9215545e | 680 | |
63e0c771 TZ |
681 | if (have_tracepoints(attrs, nr_counters)) { |
682 | /* | |
683 | * FIXME err <= 0 here actually means that | |
684 | * there were no tracepoints so its not really | |
685 | * an error, just that we don't need to | |
686 | * synthesize anything. We really have to | |
687 | * return this more properly and also | |
688 | * propagate errors that now are calling die() | |
689 | */ | |
690 | err = event__synthesize_tracing_data(output, attrs, | |
691 | nr_counters, | |
692 | process_synthesized_event, | |
693 | session); | |
694 | if (err <= 0) { | |
695 | pr_err("Couldn't record tracing data.\n"); | |
696 | return err; | |
697 | } | |
2c9faa06 | 698 | advance_output(err); |
63e0c771 | 699 | } |
2c46dbb5 TZ |
700 | } |
701 | ||
23346f21 ACM |
702 | machine = perf_session__find_host_machine(session); |
703 | if (!machine) { | |
a1645ce1 ZY |
704 | pr_err("Couldn't find native kernel information.\n"); |
705 | return -1; | |
706 | } | |
707 | ||
56b03f3c | 708 | err = event__synthesize_kernel_mmap(process_synthesized_event, |
23346f21 | 709 | session, machine, "_text"); |
70162138 ACM |
710 | if (err < 0) |
711 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 712 | session, machine, "_stext"); |
56b03f3c ACM |
713 | if (err < 0) { |
714 | pr_err("Couldn't record kernel reference relocation symbol.\n"); | |
715 | return err; | |
b7cece76 ACM |
716 | } |
717 | ||
a1645ce1 | 718 | err = event__synthesize_modules(process_synthesized_event, |
23346f21 | 719 | session, machine); |
b7cece76 ACM |
720 | if (err < 0) { |
721 | pr_err("Couldn't record kernel reference relocation symbol.\n"); | |
722 | return err; | |
d5eed904 | 723 | } |
a1645ce1 | 724 | if (perf_guest) |
23346f21 | 725 | perf_session__process_machines(session, event__synthesize_guest_os); |
7c6a1c65 | 726 | |
d4db3f16 | 727 | if (!system_wide && profile_cpu == -1) |
d6d901c2 | 728 | event__synthesize_thread(target_tid, process_synthesized_event, |
d8f66248 | 729 | session); |
234fbbf5 | 730 | else |
d8f66248 | 731 | event__synthesize_threads(process_synthesized_event, session); |
7c6a1c65 | 732 | |
de9ac07b PZ |
733 | if (realtime_prio) { |
734 | struct sched_param param; | |
735 | ||
736 | param.sched_priority = realtime_prio; | |
737 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 738 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
739 | exit(-1); |
740 | } | |
741 | } | |
742 | ||
856e9660 PZ |
743 | /* |
744 | * Let the child rip | |
745 | */ | |
d4db3f16 ACM |
746 | if (forks) |
747 | close(go_pipe[1]); | |
856e9660 | 748 | |
649c48a9 | 749 | for (;;) { |
2debbc83 | 750 | int hits = samples; |
d6d901c2 | 751 | int thread; |
de9ac07b | 752 | |
98402807 | 753 | mmap_read_all(); |
de9ac07b | 754 | |
649c48a9 PZ |
755 | if (hits == samples) { |
756 | if (done) | |
757 | break; | |
4dc0a04b | 758 | err = poll(event_array, nr_poll, -1); |
8b412664 PZ |
759 | waking++; |
760 | } | |
761 | ||
762 | if (done) { | |
763 | for (i = 0; i < nr_cpu; i++) { | |
d6d901c2 ZY |
764 | for (counter = 0; |
765 | counter < nr_counters; | |
766 | counter++) { | |
767 | for (thread = 0; | |
768 | thread < thread_num; | |
769 | thread++) | |
770 | ioctl(fd[i][counter][thread], | |
771 | PERF_EVENT_IOC_DISABLE); | |
772 | } | |
8b412664 | 773 | } |
649c48a9 | 774 | } |
de9ac07b PZ |
775 | } |
776 | ||
8b412664 PZ |
777 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
778 | ||
021e9f47 IM |
779 | /* |
780 | * Approximate RIP event size: 24 bytes. | |
781 | */ | |
782 | fprintf(stderr, | |
2debbc83 | 783 | "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", |
021e9f47 IM |
784 | (double)bytes_written / 1024.0 / 1024.0, |
785 | output_name, | |
786 | bytes_written / 24); | |
addc2785 | 787 | |
de9ac07b PZ |
788 | return 0; |
789 | } | |
0e9b20b8 | 790 | |
0e9b20b8 | 791 | static const char * const record_usage[] = { |
9e096753 MG |
792 | "perf record [<options>] [<command>]", |
793 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
794 | NULL |
795 | }; | |
796 | ||
7865e817 FW |
797 | static bool force, append_file; |
798 | ||
5242519b | 799 | static const struct option options[] = { |
0e9b20b8 | 800 | OPT_CALLBACK('e', "event", NULL, "event", |
86847b62 TG |
801 | "event selector. use 'perf list' to list available events", |
802 | parse_events), | |
c171b552 LZ |
803 | OPT_CALLBACK(0, "filter", NULL, "filter", |
804 | "event filter", parse_filter), | |
0e9b20b8 | 805 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
806 | "record events on existing process id"), |
807 | OPT_INTEGER('t', "tid", &target_tid, | |
808 | "record events on existing thread id"), | |
0e9b20b8 IM |
809 | OPT_INTEGER('r', "realtime", &realtime_prio, |
810 | "collect data with this RT SCHED_FIFO priority"), | |
daac07b2 FW |
811 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
812 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
813 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
814 | "system-wide collection from all CPUs"), | |
abaff32a IM |
815 | OPT_BOOLEAN('A', "append", &append_file, |
816 | "append to the output file to do incremental profiling"), | |
0a5ac846 JA |
817 | OPT_INTEGER('C', "profile_cpu", &profile_cpu, |
818 | "CPU to profile on"), | |
97124d5e | 819 | OPT_BOOLEAN('f', "force", &force, |
7865e817 | 820 | "overwrite existing data file (deprecated)"), |
3de29cab | 821 | OPT_U64('c', "count", &user_interval, "event period to sample"), |
abaff32a IM |
822 | OPT_STRING('o', "output", &output_name, "file", |
823 | "output file name"), | |
2e6cdf99 SE |
824 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
825 | "child tasks do not inherit counters"), | |
1967936d ACM |
826 | OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), |
827 | OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), | |
3efa1cc9 IM |
828 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
829 | "do call-graph (stack chain/backtrace) recording"), | |
c0555642 | 830 | OPT_INCR('v', "verbose", &verbose, |
3da297a6 | 831 | "be more verbose (show counter open errors, etc)"), |
649c48a9 PZ |
832 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
833 | "per thread counts"), | |
4bba828d AB |
834 | OPT_BOOLEAN('d', "data", &sample_address, |
835 | "Sample addresses"), | |
649c48a9 PZ |
836 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
837 | "don't sample"), | |
d1302522 FW |
838 | OPT_BOOLEAN('M', "multiplex", &multiplex, |
839 | "multiplex counter output in a single channel"), | |
0e9b20b8 IM |
840 | OPT_END() |
841 | }; | |
842 | ||
f37a291c | 843 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 | 844 | { |
d6d901c2 | 845 | int i,j; |
0e9b20b8 | 846 | |
a0541234 | 847 | argc = parse_options(argc, argv, options, record_usage, |
655000e7 | 848 | PARSE_OPT_STOP_AT_NON_OPTION); |
d6d901c2 ZY |
849 | if (!argc && target_pid == -1 && target_tid == -1 && |
850 | !system_wide && profile_cpu == -1) | |
0e9b20b8 IM |
851 | usage_with_options(record_usage, options); |
852 | ||
7865e817 FW |
853 | if (force && append_file) { |
854 | fprintf(stderr, "Can't overwrite and append at the same time." | |
855 | " You need to choose between -f and -A"); | |
856 | usage_with_options(record_usage, options); | |
857 | } else if (append_file) { | |
858 | write_mode = WRITE_APPEND; | |
859 | } else { | |
860 | write_mode = WRITE_FORCE; | |
861 | } | |
862 | ||
655000e7 ACM |
863 | symbol__init(); |
864 | ||
bbd36e5e PZ |
865 | if (!nr_counters) { |
866 | nr_counters = 1; | |
867 | attrs[0].type = PERF_TYPE_HARDWARE; | |
868 | attrs[0].config = PERF_COUNT_HW_CPU_CYCLES; | |
869 | } | |
0e9b20b8 | 870 | |
d6d901c2 ZY |
871 | if (target_pid != -1) { |
872 | target_tid = target_pid; | |
873 | thread_num = find_all_tid(target_pid, &all_tids); | |
874 | if (thread_num <= 0) { | |
875 | fprintf(stderr, "Can't find all threads of pid %d\n", | |
876 | target_pid); | |
877 | usage_with_options(record_usage, options); | |
878 | } | |
879 | } else { | |
880 | all_tids=malloc(sizeof(pid_t)); | |
881 | if (!all_tids) | |
882 | return -ENOMEM; | |
883 | ||
884 | all_tids[0] = target_tid; | |
885 | thread_num = 1; | |
886 | } | |
887 | ||
888 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
889 | for (j = 0; j < MAX_COUNTERS; j++) { | |
890 | fd[i][j] = malloc(sizeof(int)*thread_num); | |
5a103174 | 891 | mmap_array[i][j] = zalloc( |
d6d901c2 ZY |
892 | sizeof(struct mmap_data)*thread_num); |
893 | if (!fd[i][j] || !mmap_array[i][j]) | |
894 | return -ENOMEM; | |
895 | } | |
896 | } | |
897 | event_array = malloc( | |
898 | sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num); | |
899 | if (!event_array) | |
900 | return -ENOMEM; | |
901 | ||
3de29cab | 902 | if (user_interval != ULLONG_MAX) |
f9212819 FW |
903 | default_interval = user_interval; |
904 | if (user_freq != UINT_MAX) | |
905 | freq = user_freq; | |
906 | ||
7e4ff9e3 MG |
907 | /* |
908 | * User specified count overrides default frequency. | |
909 | */ | |
910 | if (default_interval) | |
911 | freq = 0; | |
912 | else if (freq) { | |
913 | default_interval = freq; | |
914 | } else { | |
915 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
916 | exit(EXIT_FAILURE); | |
917 | } | |
918 | ||
0e9b20b8 IM |
919 | return __cmd_record(argc, argv); |
920 | } |