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 | */ |
16f762a2 | 8 | #include "builtin.h" |
bf9e1876 IM |
9 | |
10 | #include "perf.h" | |
11 | ||
6eda5838 | 12 | #include "util/util.h" |
0e9b20b8 | 13 | #include "util/parse-options.h" |
8ad8db37 | 14 | #include "util/parse-events.h" |
a0055ae2 | 15 | #include "util/string.h" |
6eda5838 | 16 | |
7c6a1c65 | 17 | #include "util/header.h" |
66e274f3 | 18 | #include "util/event.h" |
8f28827a | 19 | #include "util/debug.h" |
7c6a1c65 | 20 | |
97124d5e | 21 | #include <unistd.h> |
de9ac07b | 22 | #include <sched.h> |
de9ac07b | 23 | |
de9ac07b | 24 | static int fd[MAX_NR_CPUS][MAX_COUNTERS]; |
a21ca2ca | 25 | |
7e4ff9e3 | 26 | static long default_interval = 0; |
a21ca2ca | 27 | |
42e59d7d | 28 | static int nr_cpus = 0; |
de9ac07b | 29 | static unsigned int page_size; |
42e59d7d IM |
30 | static unsigned int mmap_pages = 128; |
31 | static int freq = 1000; | |
de9ac07b | 32 | static int output; |
23ac9cbe | 33 | static const char *output_name = "perf.data"; |
42e59d7d IM |
34 | static int group = 0; |
35 | static unsigned int realtime_prio = 0; | |
36 | static int raw_samples = 0; | |
37 | static int system_wide = 0; | |
38 | static int profile_cpu = -1; | |
39 | static pid_t target_pid = -1; | |
40 | static pid_t child_pid = -1; | |
41 | static int inherit = 1; | |
42 | static int force = 0; | |
43 | static int append_file = 0; | |
44 | static int call_graph = 0; | |
45 | static int inherit_stat = 0; | |
46 | static int no_samples = 0; | |
47 | static int sample_address = 0; | |
48 | static int multiplex = 0; | |
49 | static int multiplex_fd = -1; | |
50 | ||
51 | static long samples = 0; | |
a21ca2ca IM |
52 | static struct timeval last_read; |
53 | static struct timeval this_read; | |
54 | ||
42e59d7d | 55 | static u64 bytes_written = 0; |
a21ca2ca IM |
56 | |
57 | static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS]; | |
58 | ||
42e59d7d IM |
59 | static int nr_poll = 0; |
60 | static int nr_cpu = 0; | |
a21ca2ca | 61 | |
42e59d7d | 62 | static int file_new = 1; |
7c6a1c65 | 63 | |
42e59d7d | 64 | struct perf_header *header = NULL; |
f5970550 | 65 | |
de9ac07b | 66 | struct mmap_data { |
a21ca2ca IM |
67 | int counter; |
68 | void *base; | |
69 | unsigned int mask; | |
70 | unsigned int prev; | |
de9ac07b PZ |
71 | }; |
72 | ||
a21ca2ca IM |
73 | static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; |
74 | ||
9d91a6f7 | 75 | static unsigned long mmap_read_head(struct mmap_data *md) |
de9ac07b | 76 | { |
cdd6c482 | 77 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 | 78 | long head; |
de9ac07b PZ |
79 | |
80 | head = pc->data_head; | |
81 | rmb(); | |
82 | ||
83 | return head; | |
84 | } | |
85 | ||
9d91a6f7 PZ |
86 | static void mmap_write_tail(struct mmap_data *md, unsigned long tail) |
87 | { | |
cdd6c482 | 88 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 PZ |
89 | |
90 | /* | |
91 | * ensure all reads are done before we write the tail out. | |
92 | */ | |
93 | /* mb(); */ | |
94 | pc->data_tail = tail; | |
95 | } | |
96 | ||
f5970550 PZ |
97 | static void write_output(void *buf, size_t size) |
98 | { | |
99 | while (size) { | |
100 | int ret = write(output, buf, size); | |
101 | ||
102 | if (ret < 0) | |
103 | die("failed to write"); | |
104 | ||
105 | size -= ret; | |
106 | buf += ret; | |
107 | ||
108 | bytes_written += ret; | |
109 | } | |
110 | } | |
111 | ||
de9ac07b PZ |
112 | static void mmap_read(struct mmap_data *md) |
113 | { | |
114 | unsigned int head = mmap_read_head(md); | |
115 | unsigned int old = md->prev; | |
116 | unsigned char *data = md->base + page_size; | |
117 | unsigned long size; | |
118 | void *buf; | |
119 | int diff; | |
120 | ||
121 | gettimeofday(&this_read, NULL); | |
122 | ||
123 | /* | |
124 | * If we're further behind than half the buffer, there's a chance | |
2debbc83 | 125 | * the writer will bite our tail and mess up the samples under us. |
de9ac07b PZ |
126 | * |
127 | * If we somehow ended up ahead of the head, we got messed up. | |
128 | * | |
129 | * In either case, truncate and restart at head. | |
130 | */ | |
131 | diff = head - old; | |
9d91a6f7 | 132 | if (diff < 0) { |
de9ac07b PZ |
133 | struct timeval iv; |
134 | unsigned long msecs; | |
135 | ||
136 | timersub(&this_read, &last_read, &iv); | |
137 | msecs = iv.tv_sec*1000 + iv.tv_usec/1000; | |
138 | ||
139 | fprintf(stderr, "WARNING: failed to keep up with mmap data." | |
140 | " Last read %lu msecs ago.\n", msecs); | |
141 | ||
142 | /* | |
143 | * head points to a known good entry, start there. | |
144 | */ | |
145 | old = head; | |
146 | } | |
147 | ||
148 | last_read = this_read; | |
149 | ||
150 | if (old != head) | |
2debbc83 | 151 | samples++; |
de9ac07b PZ |
152 | |
153 | size = head - old; | |
154 | ||
155 | if ((old & md->mask) + size != (head & md->mask)) { | |
156 | buf = &data[old & md->mask]; | |
157 | size = md->mask + 1 - (old & md->mask); | |
158 | old += size; | |
021e9f47 | 159 | |
f5970550 | 160 | write_output(buf, size); |
de9ac07b PZ |
161 | } |
162 | ||
163 | buf = &data[old & md->mask]; | |
164 | size = head - old; | |
165 | old += size; | |
021e9f47 | 166 | |
f5970550 | 167 | write_output(buf, size); |
de9ac07b PZ |
168 | |
169 | md->prev = old; | |
9d91a6f7 | 170 | mmap_write_tail(md, old); |
de9ac07b PZ |
171 | } |
172 | ||
173 | static volatile int done = 0; | |
f7b7c26e | 174 | static volatile int signr = -1; |
de9ac07b | 175 | |
16c8a109 | 176 | static void sig_handler(int sig) |
de9ac07b | 177 | { |
16c8a109 | 178 | done = 1; |
f7b7c26e PZ |
179 | signr = sig; |
180 | } | |
181 | ||
182 | static void sig_atexit(void) | |
183 | { | |
933da83a CW |
184 | if (child_pid != -1) |
185 | kill(child_pid, SIGTERM); | |
186 | ||
f7b7c26e PZ |
187 | if (signr == -1) |
188 | return; | |
189 | ||
190 | signal(signr, SIG_DFL); | |
191 | kill(getpid(), signr); | |
de9ac07b PZ |
192 | } |
193 | ||
2a8083f0 | 194 | static pid_t pid_synthesize_comm_event(pid_t pid, int full) |
1a853e36 | 195 | { |
16f762a2 | 196 | struct comm_event comm_ev; |
1a853e36 ACM |
197 | char filename[PATH_MAX]; |
198 | char bf[BUFSIZ]; | |
2a8083f0 ACM |
199 | FILE *fp; |
200 | size_t size = 0; | |
f70e87d7 PZ |
201 | DIR *tasks; |
202 | struct dirent dirent, *next; | |
2a8083f0 | 203 | pid_t tgid = 0; |
1a853e36 | 204 | |
2a8083f0 | 205 | snprintf(filename, sizeof(filename), "/proc/%d/status", pid); |
1a853e36 | 206 | |
2a8083f0 | 207 | fp = fopen(filename, "r"); |
39e6dd73 | 208 | if (fp == NULL) { |
7f3bedcc | 209 | out_race: |
613d8602 IM |
210 | /* |
211 | * We raced with a task exiting - just return: | |
212 | */ | |
213 | if (verbose) | |
214 | fprintf(stderr, "couldn't open %s\n", filename); | |
2a8083f0 | 215 | return 0; |
1a853e36 | 216 | } |
1a853e36 | 217 | |
1a853e36 | 218 | memset(&comm_ev, 0, sizeof(comm_ev)); |
2a8083f0 ACM |
219 | while (!comm_ev.comm[0] || !comm_ev.pid) { |
220 | if (fgets(bf, sizeof(bf), fp) == NULL) | |
221 | goto out_failure; | |
222 | ||
223 | if (memcmp(bf, "Name:", 5) == 0) { | |
224 | char *name = bf + 5; | |
225 | while (*name && isspace(*name)) | |
226 | ++name; | |
227 | size = strlen(name) - 1; | |
228 | memcpy(comm_ev.comm, name, size++); | |
229 | } else if (memcmp(bf, "Tgid:", 5) == 0) { | |
230 | char *tgids = bf + 5; | |
231 | while (*tgids && isspace(*tgids)) | |
232 | ++tgids; | |
233 | tgid = comm_ev.pid = atoi(tgids); | |
234 | } | |
235 | } | |
236 | ||
cdd6c482 | 237 | comm_ev.header.type = PERF_RECORD_COMM; |
9cffa8d5 | 238 | size = ALIGN(size, sizeof(u64)); |
1a853e36 | 239 | comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size); |
16f762a2 | 240 | |
f70e87d7 PZ |
241 | if (!full) { |
242 | comm_ev.tid = pid; | |
243 | ||
f5970550 | 244 | write_output(&comm_ev, comm_ev.header.size); |
2a8083f0 | 245 | goto out_fclose; |
f70e87d7 PZ |
246 | } |
247 | ||
248 | snprintf(filename, sizeof(filename), "/proc/%d/task", pid); | |
249 | ||
250 | tasks = opendir(filename); | |
7f3bedcc ACM |
251 | if (tasks == NULL) |
252 | goto out_race; | |
253 | ||
f70e87d7 PZ |
254 | while (!readdir_r(tasks, &dirent, &next) && next) { |
255 | char *end; | |
256 | pid = strtol(dirent.d_name, &end, 10); | |
257 | if (*end) | |
258 | continue; | |
259 | ||
260 | comm_ev.tid = pid; | |
261 | ||
f5970550 | 262 | write_output(&comm_ev, comm_ev.header.size); |
1a853e36 | 263 | } |
f70e87d7 | 264 | closedir(tasks); |
2a8083f0 ACM |
265 | |
266 | out_fclose: | |
267 | fclose(fp); | |
268 | return tgid; | |
f70e87d7 | 269 | |
a0055ae2 ACM |
270 | out_failure: |
271 | fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n", | |
272 | filename); | |
273 | exit(EXIT_FAILURE); | |
1a853e36 ACM |
274 | } |
275 | ||
2a8083f0 | 276 | static void pid_synthesize_mmap_samples(pid_t pid, pid_t tgid) |
1a853e36 ACM |
277 | { |
278 | char filename[PATH_MAX]; | |
279 | FILE *fp; | |
280 | ||
281 | snprintf(filename, sizeof(filename), "/proc/%d/maps", pid); | |
282 | ||
283 | fp = fopen(filename, "r"); | |
284 | if (fp == NULL) { | |
613d8602 IM |
285 | /* |
286 | * We raced with a task exiting - just return: | |
287 | */ | |
288 | if (verbose) | |
289 | fprintf(stderr, "couldn't open %s\n", filename); | |
290 | return; | |
1a853e36 ACM |
291 | } |
292 | while (1) { | |
a0055ae2 | 293 | char bf[BUFSIZ], *pbf = bf; |
1a853e36 | 294 | struct mmap_event mmap_ev = { |
cdd6c482 | 295 | .header = { .type = PERF_RECORD_MMAP }, |
1a853e36 | 296 | }; |
a0055ae2 | 297 | int n; |
1a853e36 ACM |
298 | size_t size; |
299 | if (fgets(bf, sizeof(bf), fp) == NULL) | |
300 | break; | |
301 | ||
302 | /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ | |
a0055ae2 ACM |
303 | n = hex2u64(pbf, &mmap_ev.start); |
304 | if (n < 0) | |
305 | continue; | |
306 | pbf += n + 1; | |
307 | n = hex2u64(pbf, &mmap_ev.len); | |
308 | if (n < 0) | |
309 | continue; | |
310 | pbf += n + 3; | |
311 | if (*pbf == 'x') { /* vm_exec */ | |
76c64c5e | 312 | char *execname = strchr(bf, '/'); |
1a853e36 | 313 | |
11b5f81e AB |
314 | /* Catch VDSO */ |
315 | if (execname == NULL) | |
316 | execname = strstr(bf, "[vdso]"); | |
317 | ||
76c64c5e | 318 | if (execname == NULL) |
1a853e36 ACM |
319 | continue; |
320 | ||
1a853e36 ACM |
321 | size = strlen(execname); |
322 | execname[size - 1] = '\0'; /* Remove \n */ | |
323 | memcpy(mmap_ev.filename, execname, size); | |
9cffa8d5 | 324 | size = ALIGN(size, sizeof(u64)); |
1a853e36 ACM |
325 | mmap_ev.len -= mmap_ev.start; |
326 | mmap_ev.header.size = (sizeof(mmap_ev) - | |
327 | (sizeof(mmap_ev.filename) - size)); | |
2a8083f0 | 328 | mmap_ev.pid = tgid; |
1a853e36 ACM |
329 | mmap_ev.tid = pid; |
330 | ||
f5970550 | 331 | write_output(&mmap_ev, mmap_ev.header.size); |
1a853e36 ACM |
332 | } |
333 | } | |
334 | ||
335 | fclose(fp); | |
336 | } | |
337 | ||
7c6a1c65 | 338 | static void synthesize_all(void) |
f70e87d7 PZ |
339 | { |
340 | DIR *proc; | |
341 | struct dirent dirent, *next; | |
342 | ||
343 | proc = opendir("/proc"); | |
344 | ||
345 | while (!readdir_r(proc, &dirent, &next) && next) { | |
346 | char *end; | |
2a8083f0 | 347 | pid_t pid, tgid; |
f70e87d7 PZ |
348 | |
349 | pid = strtol(dirent.d_name, &end, 10); | |
350 | if (*end) /* only interested in proper numerical dirents */ | |
351 | continue; | |
352 | ||
2a8083f0 ACM |
353 | tgid = pid_synthesize_comm_event(pid, 1); |
354 | pid_synthesize_mmap_samples(pid, tgid); | |
f70e87d7 PZ |
355 | } |
356 | ||
357 | closedir(proc); | |
358 | } | |
359 | ||
f250c030 IM |
360 | static int group_fd; |
361 | ||
cdd6c482 | 362 | static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) |
7c6a1c65 PZ |
363 | { |
364 | struct perf_header_attr *h_attr; | |
365 | ||
366 | if (nr < header->attrs) { | |
367 | h_attr = header->attr[nr]; | |
368 | } else { | |
369 | h_attr = perf_header_attr__new(a); | |
370 | perf_header__add_attr(header, h_attr); | |
371 | } | |
372 | ||
373 | return h_attr; | |
374 | } | |
375 | ||
f250c030 | 376 | static void create_counter(int counter, int cpu, pid_t pid) |
de9ac07b | 377 | { |
c171b552 | 378 | char *filter = filters[counter]; |
cdd6c482 | 379 | struct perf_event_attr *attr = attrs + counter; |
7c6a1c65 PZ |
380 | struct perf_header_attr *h_attr; |
381 | int track = !counter; /* only the first counter needs these */ | |
c171b552 | 382 | int ret; |
7c6a1c65 PZ |
383 | struct { |
384 | u64 count; | |
385 | u64 time_enabled; | |
386 | u64 time_running; | |
387 | u64 id; | |
388 | } read_data; | |
389 | ||
390 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
391 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
392 | PERF_FORMAT_ID; | |
16c8a109 | 393 | |
3a9f131f | 394 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 395 | |
1dba15e7 | 396 | if (freq) { |
ea1900e5 | 397 | attr->sample_type |= PERF_SAMPLE_PERIOD; |
a21ca2ca IM |
398 | attr->freq = 1; |
399 | attr->sample_freq = freq; | |
1dba15e7 | 400 | } |
3efa1cc9 | 401 | |
649c48a9 PZ |
402 | if (no_samples) |
403 | attr->sample_freq = 0; | |
404 | ||
405 | if (inherit_stat) | |
406 | attr->inherit_stat = 1; | |
407 | ||
4bba828d AB |
408 | if (sample_address) |
409 | attr->sample_type |= PERF_SAMPLE_ADDR; | |
410 | ||
3efa1cc9 IM |
411 | if (call_graph) |
412 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
413 | ||
cd6feeea | 414 | if (raw_samples) { |
6ddf259d | 415 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 416 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
417 | attr->sample_type |= PERF_SAMPLE_CPU; |
418 | } | |
f413cdb8 | 419 | |
a21ca2ca IM |
420 | attr->mmap = track; |
421 | attr->comm = track; | |
422 | attr->inherit = (cpu < 0) && inherit; | |
4502d77c | 423 | attr->disabled = 1; |
16c8a109 | 424 | |
3da297a6 | 425 | try_again: |
cdd6c482 | 426 | fd[nr_cpu][counter] = sys_perf_event_open(attr, pid, cpu, group_fd, 0); |
16c8a109 | 427 | |
f250c030 IM |
428 | if (fd[nr_cpu][counter] < 0) { |
429 | int err = errno; | |
16c8a109 | 430 | |
f250c030 | 431 | if (err == EPERM) |
3da297a6 | 432 | die("Permission error - are you root?\n"); |
0a5ac846 JA |
433 | else if (err == ENODEV && profile_cpu != -1) |
434 | die("No such device - did you specify an out-of-range profile CPU?\n"); | |
3da297a6 IM |
435 | |
436 | /* | |
437 | * If it's cycles then fall back to hrtimer | |
438 | * based cpu-clock-tick sw counter, which | |
439 | * is always available even if no PMU support: | |
440 | */ | |
441 | if (attr->type == PERF_TYPE_HARDWARE | |
f4dbfa8f | 442 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { |
3da297a6 IM |
443 | |
444 | if (verbose) | |
445 | warning(" ... trying to fall back to cpu-clock-ticks\n"); | |
446 | attr->type = PERF_TYPE_SOFTWARE; | |
f4dbfa8f | 447 | attr->config = PERF_COUNT_SW_CPU_CLOCK; |
3da297a6 IM |
448 | goto try_again; |
449 | } | |
30c806a0 IM |
450 | printf("\n"); |
451 | error("perfcounter syscall returned with %d (%s)\n", | |
452 | fd[nr_cpu][counter], strerror(err)); | |
cdd6c482 | 453 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
f250c030 IM |
454 | exit(-1); |
455 | } | |
3da297a6 | 456 | |
7c6a1c65 PZ |
457 | h_attr = get_header_attr(attr, counter); |
458 | ||
459 | if (!file_new) { | |
460 | if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { | |
461 | fprintf(stderr, "incompatible append\n"); | |
462 | exit(-1); | |
463 | } | |
464 | } | |
465 | ||
3928ddbe FW |
466 | if (read(fd[nr_cpu][counter], &read_data, sizeof(read_data)) == -1) { |
467 | perror("Unable to read perf file descriptor\n"); | |
468 | exit(-1); | |
469 | } | |
7c6a1c65 PZ |
470 | |
471 | perf_header_attr__add_id(h_attr, read_data.id); | |
472 | ||
f250c030 IM |
473 | assert(fd[nr_cpu][counter] >= 0); |
474 | fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK); | |
16c8a109 | 475 | |
f250c030 IM |
476 | /* |
477 | * First counter acts as the group leader: | |
478 | */ | |
479 | if (group && group_fd == -1) | |
480 | group_fd = fd[nr_cpu][counter]; | |
ea57c4f5 IM |
481 | if (multiplex && multiplex_fd == -1) |
482 | multiplex_fd = fd[nr_cpu][counter]; | |
f250c030 | 483 | |
ea57c4f5 | 484 | if (multiplex && fd[nr_cpu][counter] != multiplex_fd) { |
4502d77c | 485 | |
cdd6c482 | 486 | ret = ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd); |
ea57c4f5 IM |
487 | assert(ret != -1); |
488 | } else { | |
489 | event_array[nr_poll].fd = fd[nr_cpu][counter]; | |
490 | event_array[nr_poll].events = POLLIN; | |
491 | nr_poll++; | |
492 | ||
493 | mmap_array[nr_cpu][counter].counter = counter; | |
494 | mmap_array[nr_cpu][counter].prev = 0; | |
495 | mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1; | |
496 | mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size, | |
497 | PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter], 0); | |
498 | if (mmap_array[nr_cpu][counter].base == MAP_FAILED) { | |
499 | error("failed to mmap with %d (%s)\n", errno, strerror(errno)); | |
500 | exit(-1); | |
501 | } | |
502 | } | |
d1302522 | 503 | |
c171b552 LZ |
504 | if (filter != NULL) { |
505 | ret = ioctl(fd[nr_cpu][counter], | |
506 | PERF_EVENT_IOC_SET_FILTER, filter); | |
507 | if (ret) { | |
508 | error("failed to set filter with %d (%s)\n", errno, | |
509 | strerror(errno)); | |
510 | exit(-1); | |
511 | } | |
512 | } | |
513 | ||
cdd6c482 | 514 | ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_ENABLE); |
f250c030 | 515 | } |
f2521b6e | 516 | |
f250c030 IM |
517 | static void open_counters(int cpu, pid_t pid) |
518 | { | |
519 | int counter; | |
16c8a109 | 520 | |
f250c030 IM |
521 | group_fd = -1; |
522 | for (counter = 0; counter < nr_counters; counter++) | |
523 | create_counter(counter, cpu, pid); | |
524 | ||
16c8a109 PZ |
525 | nr_cpu++; |
526 | } | |
527 | ||
f5970550 PZ |
528 | static void atexit_header(void) |
529 | { | |
7c6a1c65 | 530 | header->data_size += bytes_written; |
f5970550 | 531 | |
7c6a1c65 | 532 | perf_header__write(header, output); |
f5970550 PZ |
533 | } |
534 | ||
0e9b20b8 | 535 | static int __cmd_record(int argc, const char **argv) |
16c8a109 PZ |
536 | { |
537 | int i, counter; | |
abaff32a | 538 | struct stat st; |
7c6a1c65 | 539 | pid_t pid = 0; |
abaff32a | 540 | int flags; |
de9ac07b | 541 | int ret; |
8b412664 | 542 | unsigned long waking = 0; |
de9ac07b PZ |
543 | |
544 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b PZ |
545 | nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
546 | assert(nr_cpus <= MAX_NR_CPUS); | |
547 | assert(nr_cpus >= 0); | |
548 | ||
f5970550 PZ |
549 | atexit(sig_atexit); |
550 | signal(SIGCHLD, sig_handler); | |
551 | signal(SIGINT, sig_handler); | |
552 | ||
266e0e21 PH |
553 | if (!stat(output_name, &st) && st.st_size) { |
554 | if (!force && !append_file) { | |
555 | fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n", | |
556 | output_name); | |
557 | exit(-1); | |
558 | } | |
559 | } else { | |
560 | append_file = 0; | |
97124d5e PZ |
561 | } |
562 | ||
abaff32a IM |
563 | flags = O_CREAT|O_RDWR; |
564 | if (append_file) | |
f5970550 | 565 | file_new = 0; |
abaff32a IM |
566 | else |
567 | flags |= O_TRUNC; | |
568 | ||
569 | output = open(output_name, flags, S_IRUSR|S_IWUSR); | |
de9ac07b PZ |
570 | if (output < 0) { |
571 | perror("failed to create output file"); | |
572 | exit(-1); | |
573 | } | |
574 | ||
7c6a1c65 PZ |
575 | if (!file_new) |
576 | header = perf_header__read(output); | |
577 | else | |
578 | header = perf_header__new(); | |
f5970550 | 579 | |
9df37ddd | 580 | if (raw_samples) { |
2ba08250 | 581 | perf_header__feat_trace_info(header); |
9df37ddd FW |
582 | } else { |
583 | for (i = 0; i < nr_counters; i++) { | |
584 | if (attrs[i].sample_type & PERF_SAMPLE_RAW) { | |
2ba08250 | 585 | perf_header__feat_trace_info(header); |
9df37ddd FW |
586 | break; |
587 | } | |
588 | } | |
589 | } | |
03456a15 | 590 | |
f5970550 PZ |
591 | atexit(atexit_header); |
592 | ||
1a853e36 | 593 | if (!system_wide) { |
7c6a1c65 PZ |
594 | pid = target_pid; |
595 | if (pid == -1) | |
596 | pid = getpid(); | |
597 | ||
0a5ac846 JA |
598 | open_counters(profile_cpu, pid); |
599 | } else { | |
600 | if (profile_cpu != -1) { | |
601 | open_counters(profile_cpu, target_pid); | |
602 | } else { | |
603 | for (i = 0; i < nr_cpus; i++) | |
604 | open_counters(i, target_pid); | |
605 | } | |
606 | } | |
de9ac07b | 607 | |
7c6a1c65 PZ |
608 | if (file_new) |
609 | perf_header__write(header, output); | |
610 | ||
611 | if (!system_wide) { | |
2a8083f0 ACM |
612 | pid_t tgid = pid_synthesize_comm_event(pid, 0); |
613 | pid_synthesize_mmap_samples(pid, tgid); | |
7c6a1c65 PZ |
614 | } else |
615 | synthesize_all(); | |
616 | ||
ef65b2a0 | 617 | if (target_pid == -1 && argc) { |
1a853e36 ACM |
618 | pid = fork(); |
619 | if (pid < 0) | |
620 | perror("failed to fork"); | |
de9ac07b | 621 | |
1a853e36 | 622 | if (!pid) { |
0e9b20b8 | 623 | if (execvp(argv[0], (char **)argv)) { |
1a853e36 ACM |
624 | perror(argv[0]); |
625 | exit(-1); | |
626 | } | |
de9ac07b | 627 | } |
933da83a CW |
628 | |
629 | child_pid = pid; | |
de9ac07b PZ |
630 | } |
631 | ||
632 | if (realtime_prio) { | |
633 | struct sched_param param; | |
634 | ||
635 | param.sched_priority = realtime_prio; | |
636 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 637 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
638 | exit(-1); |
639 | } | |
640 | } | |
641 | ||
649c48a9 | 642 | for (;;) { |
2debbc83 | 643 | int hits = samples; |
de9ac07b | 644 | |
16c8a109 | 645 | for (i = 0; i < nr_cpu; i++) { |
ea57c4f5 IM |
646 | for (counter = 0; counter < nr_counters; counter++) { |
647 | if (mmap_array[i][counter].base) | |
648 | mmap_read(&mmap_array[i][counter]); | |
649 | } | |
de9ac07b PZ |
650 | } |
651 | ||
649c48a9 PZ |
652 | if (hits == samples) { |
653 | if (done) | |
654 | break; | |
8b412664 PZ |
655 | ret = poll(event_array, nr_poll, -1); |
656 | waking++; | |
657 | } | |
658 | ||
659 | if (done) { | |
660 | for (i = 0; i < nr_cpu; i++) { | |
661 | for (counter = 0; counter < nr_counters; counter++) | |
cdd6c482 | 662 | ioctl(fd[i][counter], PERF_EVENT_IOC_DISABLE); |
8b412664 | 663 | } |
649c48a9 | 664 | } |
de9ac07b PZ |
665 | } |
666 | ||
8b412664 PZ |
667 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
668 | ||
021e9f47 IM |
669 | /* |
670 | * Approximate RIP event size: 24 bytes. | |
671 | */ | |
672 | fprintf(stderr, | |
2debbc83 | 673 | "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", |
021e9f47 IM |
674 | (double)bytes_written / 1024.0 / 1024.0, |
675 | output_name, | |
676 | bytes_written / 24); | |
addc2785 | 677 | |
de9ac07b PZ |
678 | return 0; |
679 | } | |
0e9b20b8 | 680 | |
0e9b20b8 | 681 | static const char * const record_usage[] = { |
9e096753 MG |
682 | "perf record [<options>] [<command>]", |
683 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
684 | NULL |
685 | }; | |
686 | ||
5242519b | 687 | static const struct option options[] = { |
0e9b20b8 | 688 | OPT_CALLBACK('e', "event", NULL, "event", |
86847b62 TG |
689 | "event selector. use 'perf list' to list available events", |
690 | parse_events), | |
c171b552 LZ |
691 | OPT_CALLBACK(0, "filter", NULL, "filter", |
692 | "event filter", parse_filter), | |
0e9b20b8 IM |
693 | OPT_INTEGER('p', "pid", &target_pid, |
694 | "record events on existing pid"), | |
695 | OPT_INTEGER('r', "realtime", &realtime_prio, | |
696 | "collect data with this RT SCHED_FIFO priority"), | |
daac07b2 FW |
697 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
698 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
699 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
700 | "system-wide collection from all CPUs"), | |
abaff32a IM |
701 | OPT_BOOLEAN('A', "append", &append_file, |
702 | "append to the output file to do incremental profiling"), | |
0a5ac846 JA |
703 | OPT_INTEGER('C', "profile_cpu", &profile_cpu, |
704 | "CPU to profile on"), | |
97124d5e PZ |
705 | OPT_BOOLEAN('f', "force", &force, |
706 | "overwrite existing data file"), | |
e61078a0 | 707 | OPT_LONG('c', "count", &default_interval, |
abaff32a IM |
708 | "event period to sample"), |
709 | OPT_STRING('o', "output", &output_name, "file", | |
710 | "output file name"), | |
711 | OPT_BOOLEAN('i', "inherit", &inherit, | |
712 | "child tasks inherit counters"), | |
cf1f4574 IM |
713 | OPT_INTEGER('F', "freq", &freq, |
714 | "profile at this frequency"), | |
abaff32a IM |
715 | OPT_INTEGER('m', "mmap-pages", &mmap_pages, |
716 | "number of mmap data pages"), | |
3efa1cc9 IM |
717 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
718 | "do call-graph (stack chain/backtrace) recording"), | |
3da297a6 IM |
719 | OPT_BOOLEAN('v', "verbose", &verbose, |
720 | "be more verbose (show counter open errors, etc)"), | |
649c48a9 PZ |
721 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
722 | "per thread counts"), | |
4bba828d AB |
723 | OPT_BOOLEAN('d', "data", &sample_address, |
724 | "Sample addresses"), | |
649c48a9 PZ |
725 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
726 | "don't sample"), | |
d1302522 FW |
727 | OPT_BOOLEAN('M', "multiplex", &multiplex, |
728 | "multiplex counter output in a single channel"), | |
0e9b20b8 IM |
729 | OPT_END() |
730 | }; | |
731 | ||
f37a291c | 732 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 IM |
733 | { |
734 | int counter; | |
735 | ||
a0541234 AB |
736 | argc = parse_options(argc, argv, options, record_usage, |
737 | PARSE_OPT_STOP_AT_NON_OPTION); | |
ef65b2a0 | 738 | if (!argc && target_pid == -1 && !system_wide) |
0e9b20b8 IM |
739 | usage_with_options(record_usage, options); |
740 | ||
bbd36e5e PZ |
741 | if (!nr_counters) { |
742 | nr_counters = 1; | |
743 | attrs[0].type = PERF_TYPE_HARDWARE; | |
744 | attrs[0].config = PERF_COUNT_HW_CPU_CYCLES; | |
745 | } | |
0e9b20b8 | 746 | |
7e4ff9e3 MG |
747 | /* |
748 | * User specified count overrides default frequency. | |
749 | */ | |
750 | if (default_interval) | |
751 | freq = 0; | |
752 | else if (freq) { | |
753 | default_interval = freq; | |
754 | } else { | |
755 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
756 | exit(EXIT_FAILURE); | |
757 | } | |
758 | ||
0e9b20b8 | 759 | for (counter = 0; counter < nr_counters; counter++) { |
a21ca2ca | 760 | if (attrs[counter].sample_period) |
0e9b20b8 IM |
761 | continue; |
762 | ||
a21ca2ca | 763 | attrs[counter].sample_period = default_interval; |
0e9b20b8 IM |
764 | } |
765 | ||
766 | return __cmd_record(argc, argv); | |
767 | } |