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> |
de9ac07b | 28 | |
d6d901c2 | 29 | static int *fd[MAX_NR_CPUS][MAX_COUNTERS]; |
a21ca2ca | 30 | |
7e4ff9e3 | 31 | static long default_interval = 0; |
a21ca2ca | 32 | |
42e59d7d | 33 | static int nr_cpus = 0; |
de9ac07b | 34 | static unsigned int page_size; |
42e59d7d IM |
35 | static unsigned int mmap_pages = 128; |
36 | static int freq = 1000; | |
de9ac07b | 37 | static int output; |
529870e3 | 38 | static int pipe_output = 0; |
23ac9cbe | 39 | static const char *output_name = "perf.data"; |
42e59d7d IM |
40 | static int group = 0; |
41 | static unsigned int realtime_prio = 0; | |
c0555642 IM |
42 | static bool raw_samples = false; |
43 | static bool system_wide = false; | |
42e59d7d IM |
44 | static int profile_cpu = -1; |
45 | static pid_t target_pid = -1; | |
d6d901c2 ZY |
46 | static pid_t target_tid = -1; |
47 | static pid_t *all_tids = NULL; | |
48 | static int thread_num = 0; | |
42e59d7d | 49 | static pid_t child_pid = -1; |
c0555642 IM |
50 | static bool inherit = true; |
51 | static bool force = false; | |
52 | static bool append_file = false; | |
53 | static bool call_graph = false; | |
54 | static bool inherit_stat = false; | |
55 | static bool no_samples = false; | |
56 | static bool sample_address = false; | |
57 | static bool multiplex = false; | |
42e59d7d IM |
58 | static int multiplex_fd = -1; |
59 | ||
60 | static long samples = 0; | |
a21ca2ca IM |
61 | static struct timeval last_read; |
62 | static struct timeval this_read; | |
63 | ||
42e59d7d | 64 | static u64 bytes_written = 0; |
a21ca2ca | 65 | |
d6d901c2 | 66 | static struct pollfd *event_array; |
a21ca2ca | 67 | |
42e59d7d IM |
68 | static int nr_poll = 0; |
69 | static int nr_cpu = 0; | |
a21ca2ca | 70 | |
42e59d7d | 71 | static int file_new = 1; |
6122e4e4 | 72 | static off_t post_processing_offset; |
7c6a1c65 | 73 | |
94c744b6 | 74 | static struct perf_session *session; |
f5970550 | 75 | |
de9ac07b | 76 | struct mmap_data { |
a21ca2ca IM |
77 | int counter; |
78 | void *base; | |
79 | unsigned int mask; | |
80 | unsigned int prev; | |
de9ac07b PZ |
81 | }; |
82 | ||
d6d901c2 | 83 | static struct mmap_data *mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; |
a21ca2ca | 84 | |
9d91a6f7 | 85 | static unsigned long mmap_read_head(struct mmap_data *md) |
de9ac07b | 86 | { |
cdd6c482 | 87 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 | 88 | long head; |
de9ac07b PZ |
89 | |
90 | head = pc->data_head; | |
91 | rmb(); | |
92 | ||
93 | return head; | |
94 | } | |
95 | ||
9d91a6f7 PZ |
96 | static void mmap_write_tail(struct mmap_data *md, unsigned long tail) |
97 | { | |
cdd6c482 | 98 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 PZ |
99 | |
100 | /* | |
101 | * ensure all reads are done before we write the tail out. | |
102 | */ | |
103 | /* mb(); */ | |
104 | pc->data_tail = tail; | |
105 | } | |
106 | ||
f5970550 PZ |
107 | static void write_output(void *buf, size_t size) |
108 | { | |
109 | while (size) { | |
110 | int ret = write(output, buf, size); | |
111 | ||
112 | if (ret < 0) | |
113 | die("failed to write"); | |
114 | ||
115 | size -= ret; | |
116 | buf += ret; | |
117 | ||
118 | bytes_written += ret; | |
119 | } | |
120 | } | |
121 | ||
d8f66248 ACM |
122 | static int process_synthesized_event(event_t *event, |
123 | struct perf_session *self __used) | |
234fbbf5 | 124 | { |
6122e4e4 | 125 | write_output(event, event->header.size); |
234fbbf5 ACM |
126 | return 0; |
127 | } | |
128 | ||
de9ac07b PZ |
129 | static void mmap_read(struct mmap_data *md) |
130 | { | |
131 | unsigned int head = mmap_read_head(md); | |
132 | unsigned int old = md->prev; | |
133 | unsigned char *data = md->base + page_size; | |
134 | unsigned long size; | |
135 | void *buf; | |
136 | int diff; | |
137 | ||
138 | gettimeofday(&this_read, NULL); | |
139 | ||
140 | /* | |
141 | * If we're further behind than half the buffer, there's a chance | |
2debbc83 | 142 | * the writer will bite our tail and mess up the samples under us. |
de9ac07b PZ |
143 | * |
144 | * If we somehow ended up ahead of the head, we got messed up. | |
145 | * | |
146 | * In either case, truncate and restart at head. | |
147 | */ | |
148 | diff = head - old; | |
9d91a6f7 | 149 | if (diff < 0) { |
de9ac07b PZ |
150 | struct timeval iv; |
151 | unsigned long msecs; | |
152 | ||
153 | timersub(&this_read, &last_read, &iv); | |
154 | msecs = iv.tv_sec*1000 + iv.tv_usec/1000; | |
155 | ||
156 | fprintf(stderr, "WARNING: failed to keep up with mmap data." | |
157 | " Last read %lu msecs ago.\n", msecs); | |
158 | ||
159 | /* | |
160 | * head points to a known good entry, start there. | |
161 | */ | |
162 | old = head; | |
163 | } | |
164 | ||
165 | last_read = this_read; | |
166 | ||
167 | if (old != head) | |
2debbc83 | 168 | samples++; |
de9ac07b PZ |
169 | |
170 | size = head - old; | |
171 | ||
172 | if ((old & md->mask) + size != (head & md->mask)) { | |
173 | buf = &data[old & md->mask]; | |
174 | size = md->mask + 1 - (old & md->mask); | |
175 | old += size; | |
021e9f47 | 176 | |
6122e4e4 | 177 | write_output(buf, size); |
de9ac07b PZ |
178 | } |
179 | ||
180 | buf = &data[old & md->mask]; | |
181 | size = head - old; | |
182 | old += size; | |
021e9f47 | 183 | |
6122e4e4 | 184 | write_output(buf, size); |
de9ac07b PZ |
185 | |
186 | md->prev = old; | |
9d91a6f7 | 187 | mmap_write_tail(md, old); |
de9ac07b PZ |
188 | } |
189 | ||
190 | static volatile int done = 0; | |
f7b7c26e | 191 | static volatile int signr = -1; |
de9ac07b | 192 | |
16c8a109 | 193 | static void sig_handler(int sig) |
de9ac07b | 194 | { |
16c8a109 | 195 | done = 1; |
f7b7c26e PZ |
196 | signr = sig; |
197 | } | |
198 | ||
199 | static void sig_atexit(void) | |
200 | { | |
933da83a CW |
201 | if (child_pid != -1) |
202 | kill(child_pid, SIGTERM); | |
203 | ||
f7b7c26e PZ |
204 | if (signr == -1) |
205 | return; | |
206 | ||
207 | signal(signr, SIG_DFL); | |
208 | kill(getpid(), signr); | |
de9ac07b PZ |
209 | } |
210 | ||
f250c030 IM |
211 | static int group_fd; |
212 | ||
cdd6c482 | 213 | static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) |
7c6a1c65 PZ |
214 | { |
215 | struct perf_header_attr *h_attr; | |
216 | ||
94c744b6 ACM |
217 | if (nr < session->header.attrs) { |
218 | h_attr = session->header.attr[nr]; | |
7c6a1c65 PZ |
219 | } else { |
220 | h_attr = perf_header_attr__new(a); | |
dc79c0fc | 221 | if (h_attr != NULL) |
94c744b6 | 222 | if (perf_header__add_attr(&session->header, h_attr) < 0) { |
11deb1f9 ACM |
223 | perf_header_attr__delete(h_attr); |
224 | h_attr = NULL; | |
225 | } | |
7c6a1c65 PZ |
226 | } |
227 | ||
228 | return h_attr; | |
229 | } | |
230 | ||
d6d901c2 | 231 | static void create_counter(int counter, int cpu) |
de9ac07b | 232 | { |
c171b552 | 233 | char *filter = filters[counter]; |
cdd6c482 | 234 | struct perf_event_attr *attr = attrs + counter; |
7c6a1c65 PZ |
235 | struct perf_header_attr *h_attr; |
236 | int track = !counter; /* only the first counter needs these */ | |
d6d901c2 | 237 | int thread_index; |
c171b552 | 238 | int ret; |
7c6a1c65 PZ |
239 | struct { |
240 | u64 count; | |
241 | u64 time_enabled; | |
242 | u64 time_running; | |
243 | u64 id; | |
244 | } read_data; | |
245 | ||
246 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
247 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
248 | PERF_FORMAT_ID; | |
16c8a109 | 249 | |
3a9f131f | 250 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 251 | |
8907fd60 EM |
252 | if (nr_counters > 1) |
253 | attr->sample_type |= PERF_SAMPLE_ID; | |
254 | ||
1dba15e7 | 255 | if (freq) { |
ea1900e5 | 256 | attr->sample_type |= PERF_SAMPLE_PERIOD; |
a21ca2ca IM |
257 | attr->freq = 1; |
258 | attr->sample_freq = freq; | |
1dba15e7 | 259 | } |
3efa1cc9 | 260 | |
649c48a9 PZ |
261 | if (no_samples) |
262 | attr->sample_freq = 0; | |
263 | ||
264 | if (inherit_stat) | |
265 | attr->inherit_stat = 1; | |
266 | ||
4bba828d AB |
267 | if (sample_address) |
268 | attr->sample_type |= PERF_SAMPLE_ADDR; | |
269 | ||
3efa1cc9 IM |
270 | if (call_graph) |
271 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
272 | ||
cd6feeea | 273 | if (raw_samples) { |
6ddf259d | 274 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 275 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
276 | attr->sample_type |= PERF_SAMPLE_CPU; |
277 | } | |
f413cdb8 | 278 | |
a21ca2ca IM |
279 | attr->mmap = track; |
280 | attr->comm = track; | |
60ab2716 | 281 | attr->inherit = inherit; |
46be604b ZY |
282 | if (target_pid == -1 && !system_wide) { |
283 | attr->disabled = 1; | |
bedbfdea | 284 | attr->enable_on_exec = 1; |
46be604b | 285 | } |
bedbfdea | 286 | |
d6d901c2 | 287 | for (thread_index = 0; thread_index < thread_num; thread_index++) { |
3da297a6 | 288 | try_again: |
d6d901c2 ZY |
289 | fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr, |
290 | all_tids[thread_index], cpu, group_fd, 0); | |
291 | ||
292 | if (fd[nr_cpu][counter][thread_index] < 0) { | |
293 | int err = errno; | |
294 | ||
295 | if (err == EPERM || err == EACCES) | |
296 | die("Permission error - are you root?\n" | |
297 | "\t Consider tweaking" | |
298 | " /proc/sys/kernel/perf_event_paranoid.\n"); | |
299 | else if (err == ENODEV && profile_cpu != -1) { | |
300 | die("No such device - did you specify" | |
301 | " an out-of-range profile CPU?\n"); | |
302 | } | |
3da297a6 | 303 | |
d6d901c2 ZY |
304 | /* |
305 | * If it's cycles then fall back to hrtimer | |
306 | * based cpu-clock-tick sw counter, which | |
307 | * is always available even if no PMU support: | |
308 | */ | |
309 | if (attr->type == PERF_TYPE_HARDWARE | |
310 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { | |
311 | ||
312 | if (verbose) | |
313 | warning(" ... trying to fall back to cpu-clock-ticks\n"); | |
314 | attr->type = PERF_TYPE_SOFTWARE; | |
315 | attr->config = PERF_COUNT_SW_CPU_CLOCK; | |
316 | goto try_again; | |
317 | } | |
318 | printf("\n"); | |
319 | error("perfcounter syscall returned with %d (%s)\n", | |
320 | fd[nr_cpu][counter][thread_index], strerror(err)); | |
bfd45118 SK |
321 | |
322 | #if defined(__i386__) || defined(__x86_64__) | |
d6d901c2 ZY |
323 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
324 | die("No hardware sampling interrupt available." | |
325 | " No APIC? If so then you can boot the kernel" | |
326 | " with the \"lapic\" boot parameter to" | |
327 | " force-enable it.\n"); | |
bfd45118 SK |
328 | #endif |
329 | ||
d6d901c2 ZY |
330 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
331 | exit(-1); | |
332 | } | |
3da297a6 | 333 | |
d6d901c2 ZY |
334 | h_attr = get_header_attr(attr, counter); |
335 | if (h_attr == NULL) | |
336 | die("nomem\n"); | |
7c6a1c65 | 337 | |
d6d901c2 ZY |
338 | if (!file_new) { |
339 | if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { | |
340 | fprintf(stderr, "incompatible append\n"); | |
341 | exit(-1); | |
342 | } | |
7c6a1c65 | 343 | } |
7c6a1c65 | 344 | |
d6d901c2 ZY |
345 | if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) { |
346 | perror("Unable to read perf file descriptor\n"); | |
347 | exit(-1); | |
348 | } | |
7c6a1c65 | 349 | |
d6d901c2 ZY |
350 | if (perf_header_attr__add_id(h_attr, read_data.id) < 0) { |
351 | pr_warning("Not enough memory to add id\n"); | |
352 | exit(-1); | |
353 | } | |
7c6a1c65 | 354 | |
d6d901c2 ZY |
355 | assert(fd[nr_cpu][counter][thread_index] >= 0); |
356 | fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK); | |
16c8a109 | 357 | |
d6d901c2 ZY |
358 | /* |
359 | * First counter acts as the group leader: | |
360 | */ | |
361 | if (group && group_fd == -1) | |
362 | group_fd = fd[nr_cpu][counter][thread_index]; | |
363 | if (multiplex && multiplex_fd == -1) | |
364 | multiplex_fd = fd[nr_cpu][counter][thread_index]; | |
f250c030 | 365 | |
d6d901c2 | 366 | if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) { |
4502d77c | 367 | |
d6d901c2 ZY |
368 | ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd); |
369 | assert(ret != -1); | |
370 | } else { | |
371 | event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index]; | |
372 | event_array[nr_poll].events = POLLIN; | |
373 | nr_poll++; | |
374 | ||
375 | mmap_array[nr_cpu][counter][thread_index].counter = counter; | |
376 | mmap_array[nr_cpu][counter][thread_index].prev = 0; | |
377 | mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1; | |
378 | mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size, | |
379 | PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0); | |
380 | if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) { | |
381 | error("failed to mmap with %d (%s)\n", errno, strerror(errno)); | |
382 | exit(-1); | |
383 | } | |
ea57c4f5 | 384 | } |
d1302522 | 385 | |
d6d901c2 ZY |
386 | if (filter != NULL) { |
387 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
388 | PERF_EVENT_IOC_SET_FILTER, filter); | |
389 | if (ret) { | |
390 | error("failed to set filter with %d (%s)\n", errno, | |
391 | strerror(errno)); | |
392 | exit(-1); | |
393 | } | |
c171b552 LZ |
394 | } |
395 | } | |
f250c030 | 396 | } |
f2521b6e | 397 | |
d6d901c2 | 398 | static void open_counters(int cpu) |
f250c030 IM |
399 | { |
400 | int counter; | |
16c8a109 | 401 | |
f250c030 IM |
402 | group_fd = -1; |
403 | for (counter = 0; counter < nr_counters; counter++) | |
d6d901c2 | 404 | create_counter(counter, cpu); |
f250c030 | 405 | |
16c8a109 PZ |
406 | nr_cpu++; |
407 | } | |
408 | ||
6122e4e4 ACM |
409 | static int process_buildids(void) |
410 | { | |
411 | u64 size = lseek(output, 0, SEEK_CUR); | |
412 | ||
9f591fd7 ACM |
413 | if (size == 0) |
414 | return 0; | |
415 | ||
6122e4e4 ACM |
416 | session->fd = output; |
417 | return __perf_session__process_events(session, post_processing_offset, | |
418 | size - post_processing_offset, | |
419 | size, &build_id__mark_dso_hit_ops); | |
420 | } | |
421 | ||
f5970550 PZ |
422 | static void atexit_header(void) |
423 | { | |
94c744b6 | 424 | session->header.data_size += bytes_written; |
f5970550 | 425 | |
6122e4e4 | 426 | process_buildids(); |
94c744b6 | 427 | perf_header__write(&session->header, output, true); |
f5970550 PZ |
428 | } |
429 | ||
d4db3f16 | 430 | static int __cmd_record(int argc, const char **argv) |
16c8a109 PZ |
431 | { |
432 | int i, counter; | |
abaff32a | 433 | struct stat st; |
7c6a1c65 | 434 | pid_t pid = 0; |
abaff32a | 435 | int flags; |
4dc0a04b | 436 | int err; |
8b412664 | 437 | unsigned long waking = 0; |
856e9660 | 438 | int child_ready_pipe[2], go_pipe[2]; |
46be604b | 439 | const bool forks = argc > 0; |
856e9660 | 440 | char buf; |
de9ac07b PZ |
441 | |
442 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b | 443 | |
f5970550 PZ |
444 | atexit(sig_atexit); |
445 | signal(SIGCHLD, sig_handler); | |
446 | signal(SIGINT, sig_handler); | |
447 | ||
d4db3f16 | 448 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
856e9660 PZ |
449 | perror("failed to create pipes"); |
450 | exit(-1); | |
451 | } | |
452 | ||
529870e3 TZ |
453 | if (!strcmp(output_name, "-")) |
454 | pipe_output = 1; | |
455 | else if (!stat(output_name, &st) && st.st_size) { | |
b38d3464 ACM |
456 | if (!force) { |
457 | if (!append_file) { | |
458 | pr_err("Error, output file %s exists, use -A " | |
459 | "to append or -f to overwrite.\n", | |
460 | output_name); | |
461 | exit(-1); | |
462 | } | |
463 | } else { | |
464 | char oldname[PATH_MAX]; | |
465 | snprintf(oldname, sizeof(oldname), "%s.old", | |
466 | output_name); | |
467 | unlink(oldname); | |
468 | rename(output_name, oldname); | |
266e0e21 PH |
469 | } |
470 | } else { | |
c0555642 | 471 | append_file = false; |
97124d5e PZ |
472 | } |
473 | ||
f887f301 | 474 | flags = O_CREAT|O_RDWR; |
abaff32a | 475 | if (append_file) |
f5970550 | 476 | file_new = 0; |
abaff32a IM |
477 | else |
478 | flags |= O_TRUNC; | |
479 | ||
529870e3 TZ |
480 | if (pipe_output) |
481 | output = STDOUT_FILENO; | |
482 | else | |
483 | output = open(output_name, flags, S_IRUSR | S_IWUSR); | |
de9ac07b PZ |
484 | if (output < 0) { |
485 | perror("failed to create output file"); | |
486 | exit(-1); | |
487 | } | |
488 | ||
75be6cf4 | 489 | session = perf_session__new(output_name, O_WRONLY, force); |
94c744b6 | 490 | if (session == NULL) { |
a9a70bbc ACM |
491 | pr_err("Not enough memory for reading perf file header\n"); |
492 | return -1; | |
493 | } | |
494 | ||
4dc0a04b | 495 | if (!file_new) { |
8dc58101 | 496 | err = perf_header__read(session, output); |
4dc0a04b ACM |
497 | if (err < 0) |
498 | return err; | |
499 | } | |
500 | ||
9df37ddd | 501 | if (raw_samples) { |
94c744b6 | 502 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
9df37ddd FW |
503 | } else { |
504 | for (i = 0; i < nr_counters; i++) { | |
505 | if (attrs[i].sample_type & PERF_SAMPLE_RAW) { | |
94c744b6 | 506 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
9df37ddd FW |
507 | break; |
508 | } | |
509 | } | |
510 | } | |
03456a15 | 511 | |
f5970550 PZ |
512 | atexit(atexit_header); |
513 | ||
d4db3f16 | 514 | if (forks) { |
46be604b | 515 | child_pid = fork(); |
856e9660 PZ |
516 | if (pid < 0) { |
517 | perror("failed to fork"); | |
518 | exit(-1); | |
519 | } | |
7c6a1c65 | 520 | |
46be604b | 521 | if (!child_pid) { |
529870e3 TZ |
522 | if (pipe_output) |
523 | dup2(2, 1); | |
856e9660 PZ |
524 | close(child_ready_pipe[0]); |
525 | close(go_pipe[1]); | |
526 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
527 | ||
528 | /* | |
529 | * Do a dummy execvp to get the PLT entry resolved, | |
530 | * so we avoid the resolver overhead on the real | |
531 | * execvp call. | |
532 | */ | |
533 | execvp("", (char **)argv); | |
534 | ||
535 | /* | |
536 | * Tell the parent we're ready to go | |
537 | */ | |
538 | close(child_ready_pipe[1]); | |
539 | ||
540 | /* | |
541 | * Wait until the parent tells us to go. | |
542 | */ | |
543 | if (read(go_pipe[0], &buf, 1) == -1) | |
544 | perror("unable to read pipe"); | |
545 | ||
546 | execvp(argv[0], (char **)argv); | |
547 | ||
548 | perror(argv[0]); | |
549 | exit(-1); | |
0a5ac846 | 550 | } |
856e9660 | 551 | |
d6d901c2 ZY |
552 | if (!system_wide && target_tid == -1 && target_pid == -1) |
553 | all_tids[0] = child_pid; | |
554 | ||
856e9660 PZ |
555 | close(child_ready_pipe[1]); |
556 | close(go_pipe[0]); | |
557 | /* | |
558 | * wait for child to settle | |
559 | */ | |
560 | if (read(child_ready_pipe[0], &buf, 1) == -1) { | |
561 | perror("unable to read pipe"); | |
562 | exit(-1); | |
563 | } | |
564 | close(child_ready_pipe[0]); | |
565 | } | |
566 | ||
60ab2716 | 567 | if ((!system_wide && !inherit) || profile_cpu != -1) { |
d6d901c2 | 568 | open_counters(profile_cpu); |
856e9660 | 569 | } else { |
a12b51c4 | 570 | nr_cpus = read_cpu_map(); |
856e9660 | 571 | for (i = 0; i < nr_cpus; i++) |
d6d901c2 | 572 | open_counters(cpumap[i]); |
0a5ac846 | 573 | } |
de9ac07b | 574 | |
529870e3 TZ |
575 | if (pipe_output) { |
576 | err = perf_header__write_pipe(output); | |
577 | if (err < 0) | |
578 | return err; | |
579 | } else if (file_new) { | |
94c744b6 | 580 | err = perf_header__write(&session->header, output, false); |
d5eed904 ACM |
581 | if (err < 0) |
582 | return err; | |
56b03f3c ACM |
583 | } |
584 | ||
6122e4e4 ACM |
585 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
586 | ||
56b03f3c ACM |
587 | err = event__synthesize_kernel_mmap(process_synthesized_event, |
588 | session, "_text"); | |
70162138 ACM |
589 | if (err < 0) |
590 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
591 | session, "_stext"); | |
56b03f3c ACM |
592 | if (err < 0) { |
593 | pr_err("Couldn't record kernel reference relocation symbol.\n"); | |
594 | return err; | |
b7cece76 ACM |
595 | } |
596 | ||
597 | err = event__synthesize_modules(process_synthesized_event, session); | |
598 | if (err < 0) { | |
599 | pr_err("Couldn't record kernel reference relocation symbol.\n"); | |
600 | return err; | |
d5eed904 | 601 | } |
7c6a1c65 | 602 | |
d4db3f16 | 603 | if (!system_wide && profile_cpu == -1) |
d6d901c2 | 604 | event__synthesize_thread(target_tid, process_synthesized_event, |
d8f66248 | 605 | session); |
234fbbf5 | 606 | else |
d8f66248 | 607 | event__synthesize_threads(process_synthesized_event, session); |
7c6a1c65 | 608 | |
de9ac07b PZ |
609 | if (realtime_prio) { |
610 | struct sched_param param; | |
611 | ||
612 | param.sched_priority = realtime_prio; | |
613 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 614 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
615 | exit(-1); |
616 | } | |
617 | } | |
618 | ||
856e9660 PZ |
619 | /* |
620 | * Let the child rip | |
621 | */ | |
d4db3f16 ACM |
622 | if (forks) |
623 | close(go_pipe[1]); | |
856e9660 | 624 | |
649c48a9 | 625 | for (;;) { |
2debbc83 | 626 | int hits = samples; |
d6d901c2 | 627 | int thread; |
de9ac07b | 628 | |
16c8a109 | 629 | for (i = 0; i < nr_cpu; i++) { |
ea57c4f5 | 630 | for (counter = 0; counter < nr_counters; counter++) { |
d6d901c2 ZY |
631 | for (thread = 0; |
632 | thread < thread_num; thread++) { | |
633 | if (mmap_array[i][counter][thread].base) | |
634 | mmap_read(&mmap_array[i][counter][thread]); | |
635 | } | |
636 | ||
ea57c4f5 | 637 | } |
de9ac07b PZ |
638 | } |
639 | ||
649c48a9 PZ |
640 | if (hits == samples) { |
641 | if (done) | |
642 | break; | |
4dc0a04b | 643 | err = poll(event_array, nr_poll, -1); |
8b412664 PZ |
644 | waking++; |
645 | } | |
646 | ||
647 | if (done) { | |
648 | for (i = 0; i < nr_cpu; i++) { | |
d6d901c2 ZY |
649 | for (counter = 0; |
650 | counter < nr_counters; | |
651 | counter++) { | |
652 | for (thread = 0; | |
653 | thread < thread_num; | |
654 | thread++) | |
655 | ioctl(fd[i][counter][thread], | |
656 | PERF_EVENT_IOC_DISABLE); | |
657 | } | |
8b412664 | 658 | } |
649c48a9 | 659 | } |
de9ac07b PZ |
660 | } |
661 | ||
8b412664 PZ |
662 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
663 | ||
021e9f47 IM |
664 | /* |
665 | * Approximate RIP event size: 24 bytes. | |
666 | */ | |
667 | fprintf(stderr, | |
2debbc83 | 668 | "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", |
021e9f47 IM |
669 | (double)bytes_written / 1024.0 / 1024.0, |
670 | output_name, | |
671 | bytes_written / 24); | |
addc2785 | 672 | |
de9ac07b PZ |
673 | return 0; |
674 | } | |
0e9b20b8 | 675 | |
0e9b20b8 | 676 | static const char * const record_usage[] = { |
9e096753 MG |
677 | "perf record [<options>] [<command>]", |
678 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
679 | NULL |
680 | }; | |
681 | ||
5242519b | 682 | static const struct option options[] = { |
0e9b20b8 | 683 | OPT_CALLBACK('e', "event", NULL, "event", |
86847b62 TG |
684 | "event selector. use 'perf list' to list available events", |
685 | parse_events), | |
c171b552 LZ |
686 | OPT_CALLBACK(0, "filter", NULL, "filter", |
687 | "event filter", parse_filter), | |
0e9b20b8 | 688 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
689 | "record events on existing process id"), |
690 | OPT_INTEGER('t', "tid", &target_tid, | |
691 | "record events on existing thread id"), | |
0e9b20b8 IM |
692 | OPT_INTEGER('r', "realtime", &realtime_prio, |
693 | "collect data with this RT SCHED_FIFO priority"), | |
daac07b2 FW |
694 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
695 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
696 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
697 | "system-wide collection from all CPUs"), | |
abaff32a IM |
698 | OPT_BOOLEAN('A', "append", &append_file, |
699 | "append to the output file to do incremental profiling"), | |
0a5ac846 JA |
700 | OPT_INTEGER('C', "profile_cpu", &profile_cpu, |
701 | "CPU to profile on"), | |
97124d5e PZ |
702 | OPT_BOOLEAN('f', "force", &force, |
703 | "overwrite existing data file"), | |
e61078a0 | 704 | OPT_LONG('c', "count", &default_interval, |
abaff32a IM |
705 | "event period to sample"), |
706 | OPT_STRING('o', "output", &output_name, "file", | |
707 | "output file name"), | |
708 | OPT_BOOLEAN('i', "inherit", &inherit, | |
709 | "child tasks inherit counters"), | |
cf1f4574 IM |
710 | OPT_INTEGER('F', "freq", &freq, |
711 | "profile at this frequency"), | |
abaff32a IM |
712 | OPT_INTEGER('m', "mmap-pages", &mmap_pages, |
713 | "number of mmap data pages"), | |
3efa1cc9 IM |
714 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
715 | "do call-graph (stack chain/backtrace) recording"), | |
c0555642 | 716 | OPT_INCR('v', "verbose", &verbose, |
3da297a6 | 717 | "be more verbose (show counter open errors, etc)"), |
649c48a9 PZ |
718 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
719 | "per thread counts"), | |
4bba828d AB |
720 | OPT_BOOLEAN('d', "data", &sample_address, |
721 | "Sample addresses"), | |
649c48a9 PZ |
722 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
723 | "don't sample"), | |
d1302522 FW |
724 | OPT_BOOLEAN('M', "multiplex", &multiplex, |
725 | "multiplex counter output in a single channel"), | |
0e9b20b8 IM |
726 | OPT_END() |
727 | }; | |
728 | ||
f37a291c | 729 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 IM |
730 | { |
731 | int counter; | |
d6d901c2 | 732 | int i,j; |
0e9b20b8 | 733 | |
a0541234 | 734 | argc = parse_options(argc, argv, options, record_usage, |
655000e7 | 735 | PARSE_OPT_STOP_AT_NON_OPTION); |
d6d901c2 ZY |
736 | if (!argc && target_pid == -1 && target_tid == -1 && |
737 | !system_wide && profile_cpu == -1) | |
0e9b20b8 IM |
738 | usage_with_options(record_usage, options); |
739 | ||
655000e7 ACM |
740 | symbol__init(); |
741 | ||
bbd36e5e PZ |
742 | if (!nr_counters) { |
743 | nr_counters = 1; | |
744 | attrs[0].type = PERF_TYPE_HARDWARE; | |
745 | attrs[0].config = PERF_COUNT_HW_CPU_CYCLES; | |
746 | } | |
0e9b20b8 | 747 | |
d6d901c2 ZY |
748 | if (target_pid != -1) { |
749 | target_tid = target_pid; | |
750 | thread_num = find_all_tid(target_pid, &all_tids); | |
751 | if (thread_num <= 0) { | |
752 | fprintf(stderr, "Can't find all threads of pid %d\n", | |
753 | target_pid); | |
754 | usage_with_options(record_usage, options); | |
755 | } | |
756 | } else { | |
757 | all_tids=malloc(sizeof(pid_t)); | |
758 | if (!all_tids) | |
759 | return -ENOMEM; | |
760 | ||
761 | all_tids[0] = target_tid; | |
762 | thread_num = 1; | |
763 | } | |
764 | ||
765 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
766 | for (j = 0; j < MAX_COUNTERS; j++) { | |
767 | fd[i][j] = malloc(sizeof(int)*thread_num); | |
5a103174 | 768 | mmap_array[i][j] = zalloc( |
d6d901c2 ZY |
769 | sizeof(struct mmap_data)*thread_num); |
770 | if (!fd[i][j] || !mmap_array[i][j]) | |
771 | return -ENOMEM; | |
772 | } | |
773 | } | |
774 | event_array = malloc( | |
775 | sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num); | |
776 | if (!event_array) | |
777 | return -ENOMEM; | |
778 | ||
7e4ff9e3 MG |
779 | /* |
780 | * User specified count overrides default frequency. | |
781 | */ | |
782 | if (default_interval) | |
783 | freq = 0; | |
784 | else if (freq) { | |
785 | default_interval = freq; | |
786 | } else { | |
787 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
788 | exit(EXIT_FAILURE); | |
789 | } | |
790 | ||
0e9b20b8 | 791 | for (counter = 0; counter < nr_counters; counter++) { |
a21ca2ca | 792 | if (attrs[counter].sample_period) |
0e9b20b8 IM |
793 | continue; |
794 | ||
a21ca2ca | 795 | attrs[counter].sample_period = default_interval; |
0e9b20b8 IM |
796 | } |
797 | ||
798 | return __cmd_record(argc, argv); | |
799 | } |