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; | |
640c03ce | 39 | static u64 sample_type; |
a21ca2ca | 40 | |
42e59d7d | 41 | static int nr_cpus = 0; |
de9ac07b | 42 | static unsigned int page_size; |
42e59d7d | 43 | static unsigned int mmap_pages = 128; |
f9212819 | 44 | static unsigned int user_freq = UINT_MAX; |
42e59d7d | 45 | static int freq = 1000; |
de9ac07b | 46 | static int output; |
529870e3 | 47 | static int pipe_output = 0; |
23ac9cbe | 48 | static const char *output_name = "perf.data"; |
42e59d7d | 49 | static int group = 0; |
1967936d | 50 | static int realtime_prio = 0; |
c0555642 | 51 | static bool raw_samples = false; |
9c90a61c | 52 | static bool sample_id_all_avail = true; |
c0555642 | 53 | static bool system_wide = false; |
42e59d7d | 54 | static pid_t target_pid = -1; |
d6d901c2 ZY |
55 | static pid_t target_tid = -1; |
56 | static pid_t *all_tids = NULL; | |
57 | static int thread_num = 0; | |
42e59d7d | 58 | static pid_t child_pid = -1; |
2e6cdf99 | 59 | static bool no_inherit = false; |
7865e817 | 60 | static enum write_mode_t write_mode = WRITE_FORCE; |
c0555642 IM |
61 | static bool call_graph = false; |
62 | static bool inherit_stat = false; | |
63 | static bool no_samples = false; | |
64 | static bool sample_address = false; | |
9c90a61c | 65 | static bool sample_time = false; |
a1ac1d3c | 66 | static bool no_buildid = false; |
baa2f6ce | 67 | static bool no_buildid_cache = false; |
42e59d7d IM |
68 | |
69 | static long samples = 0; | |
42e59d7d | 70 | static u64 bytes_written = 0; |
a21ca2ca | 71 | |
d6d901c2 | 72 | static struct pollfd *event_array; |
a21ca2ca | 73 | |
42e59d7d IM |
74 | static int nr_poll = 0; |
75 | static int nr_cpu = 0; | |
a21ca2ca | 76 | |
42e59d7d | 77 | static int file_new = 1; |
6122e4e4 | 78 | static off_t post_processing_offset; |
7c6a1c65 | 79 | |
94c744b6 | 80 | static struct perf_session *session; |
c45c6ea2 | 81 | static const char *cpu_list; |
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 | ||
0e2e63dd | 90 | static struct mmap_data mmap_array[MAX_NR_CPUS]; |
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 | 134 | static int process_synthesized_event(event_t *event, |
640c03ce | 135 | struct sample_data *sample __used, |
d8f66248 | 136 | struct perf_session *self __used) |
234fbbf5 | 137 | { |
6122e4e4 | 138 | write_output(event, event->header.size); |
234fbbf5 ACM |
139 | return 0; |
140 | } | |
141 | ||
de9ac07b PZ |
142 | static void mmap_read(struct mmap_data *md) |
143 | { | |
144 | unsigned int head = mmap_read_head(md); | |
145 | unsigned int old = md->prev; | |
146 | unsigned char *data = md->base + page_size; | |
147 | unsigned long size; | |
148 | void *buf; | |
149 | int diff; | |
150 | ||
de9ac07b PZ |
151 | /* |
152 | * If we're further behind than half the buffer, there's a chance | |
2debbc83 | 153 | * the writer will bite our tail and mess up the samples under us. |
de9ac07b PZ |
154 | * |
155 | * If we somehow ended up ahead of the head, we got messed up. | |
156 | * | |
157 | * In either case, truncate and restart at head. | |
158 | */ | |
159 | diff = head - old; | |
9d91a6f7 | 160 | if (diff < 0) { |
ef365cef | 161 | fprintf(stderr, "WARNING: failed to keep up with mmap data\n"); |
de9ac07b PZ |
162 | /* |
163 | * head points to a known good entry, start there. | |
164 | */ | |
165 | old = head; | |
166 | } | |
167 | ||
de9ac07b | 168 | if (old != head) |
2debbc83 | 169 | samples++; |
de9ac07b PZ |
170 | |
171 | size = head - old; | |
172 | ||
173 | if ((old & md->mask) + size != (head & md->mask)) { | |
174 | buf = &data[old & md->mask]; | |
175 | size = md->mask + 1 - (old & md->mask); | |
176 | old += size; | |
021e9f47 | 177 | |
6122e4e4 | 178 | write_output(buf, size); |
de9ac07b PZ |
179 | } |
180 | ||
181 | buf = &data[old & md->mask]; | |
182 | size = head - old; | |
183 | old += size; | |
021e9f47 | 184 | |
6122e4e4 | 185 | write_output(buf, size); |
de9ac07b PZ |
186 | |
187 | md->prev = old; | |
9d91a6f7 | 188 | mmap_write_tail(md, old); |
de9ac07b PZ |
189 | } |
190 | ||
191 | static volatile int done = 0; | |
f7b7c26e | 192 | static volatile int signr = -1; |
de9ac07b | 193 | |
16c8a109 | 194 | static void sig_handler(int sig) |
de9ac07b | 195 | { |
16c8a109 | 196 | done = 1; |
f7b7c26e PZ |
197 | signr = sig; |
198 | } | |
199 | ||
200 | static void sig_atexit(void) | |
201 | { | |
5ffc8881 | 202 | if (child_pid > 0) |
933da83a CW |
203 | kill(child_pid, SIGTERM); |
204 | ||
18483b81 | 205 | if (signr == -1 || signr == SIGUSR1) |
f7b7c26e PZ |
206 | return; |
207 | ||
208 | signal(signr, SIG_DFL); | |
209 | kill(getpid(), signr); | |
de9ac07b PZ |
210 | } |
211 | ||
f250c030 IM |
212 | static int group_fd; |
213 | ||
cdd6c482 | 214 | static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) |
7c6a1c65 PZ |
215 | { |
216 | struct perf_header_attr *h_attr; | |
217 | ||
94c744b6 ACM |
218 | if (nr < session->header.attrs) { |
219 | h_attr = session->header.attr[nr]; | |
7c6a1c65 PZ |
220 | } else { |
221 | h_attr = perf_header_attr__new(a); | |
dc79c0fc | 222 | if (h_attr != NULL) |
94c744b6 | 223 | if (perf_header__add_attr(&session->header, h_attr) < 0) { |
11deb1f9 ACM |
224 | perf_header_attr__delete(h_attr); |
225 | h_attr = NULL; | |
226 | } | |
7c6a1c65 PZ |
227 | } |
228 | ||
229 | return h_attr; | |
230 | } | |
231 | ||
d6d901c2 | 232 | static void create_counter(int counter, int cpu) |
de9ac07b | 233 | { |
c171b552 | 234 | char *filter = filters[counter]; |
cdd6c482 | 235 | struct perf_event_attr *attr = attrs + counter; |
7c6a1c65 PZ |
236 | struct perf_header_attr *h_attr; |
237 | int track = !counter; /* only the first counter needs these */ | |
d6d901c2 | 238 | int thread_index; |
c171b552 | 239 | int ret; |
7c6a1c65 PZ |
240 | struct { |
241 | u64 count; | |
242 | u64 time_enabled; | |
243 | u64 time_running; | |
244 | u64 id; | |
245 | } read_data; | |
246 | ||
247 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
248 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
249 | PERF_FORMAT_ID; | |
16c8a109 | 250 | |
3a9f131f | 251 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 252 | |
8907fd60 EM |
253 | if (nr_counters > 1) |
254 | attr->sample_type |= PERF_SAMPLE_ID; | |
255 | ||
f9212819 FW |
256 | /* |
257 | * We default some events to a 1 default interval. But keep | |
258 | * it a weak assumption overridable by the user. | |
259 | */ | |
260 | if (!attr->sample_period || (user_freq != UINT_MAX && | |
3de29cab | 261 | user_interval != ULLONG_MAX)) { |
f9212819 FW |
262 | if (freq) { |
263 | attr->sample_type |= PERF_SAMPLE_PERIOD; | |
264 | attr->freq = 1; | |
265 | attr->sample_freq = freq; | |
266 | } else { | |
267 | attr->sample_period = default_interval; | |
268 | } | |
1dba15e7 | 269 | } |
3efa1cc9 | 270 | |
649c48a9 PZ |
271 | if (no_samples) |
272 | attr->sample_freq = 0; | |
273 | ||
274 | if (inherit_stat) | |
275 | attr->inherit_stat = 1; | |
276 | ||
3af9e859 | 277 | if (sample_address) { |
4bba828d | 278 | attr->sample_type |= PERF_SAMPLE_ADDR; |
3af9e859 EM |
279 | attr->mmap_data = track; |
280 | } | |
4bba828d | 281 | |
3efa1cc9 IM |
282 | if (call_graph) |
283 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
284 | ||
f60f3593 AS |
285 | if (system_wide) |
286 | attr->sample_type |= PERF_SAMPLE_CPU; | |
287 | ||
9c90a61c ACM |
288 | if (sample_time) |
289 | attr->sample_type |= PERF_SAMPLE_TIME; | |
290 | ||
cd6feeea | 291 | if (raw_samples) { |
6ddf259d | 292 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 293 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
294 | attr->sample_type |= PERF_SAMPLE_CPU; |
295 | } | |
f413cdb8 | 296 | |
640c03ce ACM |
297 | if (!sample_type) |
298 | sample_type = attr->sample_type; | |
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 | } |
9c90a61c ACM |
307 | retry_sample_id: |
308 | attr->sample_id_all = sample_id_all_avail ? 1 : 0; | |
bedbfdea | 309 | |
d6d901c2 | 310 | for (thread_index = 0; thread_index < thread_num; thread_index++) { |
3da297a6 | 311 | try_again: |
d6d901c2 ZY |
312 | fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr, |
313 | all_tids[thread_index], cpu, group_fd, 0); | |
314 | ||
315 | if (fd[nr_cpu][counter][thread_index] < 0) { | |
316 | int err = errno; | |
317 | ||
318 | if (err == EPERM || err == EACCES) | |
319 | die("Permission error - are you root?\n" | |
320 | "\t Consider tweaking" | |
321 | " /proc/sys/kernel/perf_event_paranoid.\n"); | |
c45c6ea2 | 322 | else if (err == ENODEV && cpu_list) { |
d6d901c2 ZY |
323 | die("No such device - did you specify" |
324 | " an out-of-range profile CPU?\n"); | |
9c90a61c ACM |
325 | } else if (err == EINVAL && sample_id_all_avail) { |
326 | /* | |
327 | * Old kernel, no attr->sample_id_type_all field | |
328 | */ | |
329 | sample_id_all_avail = false; | |
330 | goto retry_sample_id; | |
d6d901c2 | 331 | } |
3da297a6 | 332 | |
d6d901c2 ZY |
333 | /* |
334 | * If it's cycles then fall back to hrtimer | |
335 | * based cpu-clock-tick sw counter, which | |
336 | * is always available even if no PMU support: | |
337 | */ | |
338 | if (attr->type == PERF_TYPE_HARDWARE | |
339 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { | |
340 | ||
341 | if (verbose) | |
342 | warning(" ... trying to fall back to cpu-clock-ticks\n"); | |
343 | attr->type = PERF_TYPE_SOFTWARE; | |
344 | attr->config = PERF_COUNT_SW_CPU_CLOCK; | |
345 | goto try_again; | |
346 | } | |
347 | printf("\n"); | |
d9cf837e | 348 | error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", |
d6d901c2 | 349 | fd[nr_cpu][counter][thread_index], strerror(err)); |
bfd45118 SK |
350 | |
351 | #if defined(__i386__) || defined(__x86_64__) | |
d6d901c2 ZY |
352 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
353 | die("No hardware sampling interrupt available." | |
354 | " No APIC? If so then you can boot the kernel" | |
355 | " with the \"lapic\" boot parameter to" | |
356 | " force-enable it.\n"); | |
bfd45118 SK |
357 | #endif |
358 | ||
d6d901c2 ZY |
359 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
360 | exit(-1); | |
361 | } | |
3da297a6 | 362 | |
d6d901c2 ZY |
363 | h_attr = get_header_attr(attr, counter); |
364 | if (h_attr == NULL) | |
365 | die("nomem\n"); | |
7c6a1c65 | 366 | |
d6d901c2 ZY |
367 | if (!file_new) { |
368 | if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { | |
369 | fprintf(stderr, "incompatible append\n"); | |
370 | exit(-1); | |
371 | } | |
7c6a1c65 | 372 | } |
7c6a1c65 | 373 | |
d6d901c2 | 374 | if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) { |
0ab7368f | 375 | perror("Unable to read perf file descriptor"); |
d6d901c2 ZY |
376 | exit(-1); |
377 | } | |
7c6a1c65 | 378 | |
d6d901c2 ZY |
379 | if (perf_header_attr__add_id(h_attr, read_data.id) < 0) { |
380 | pr_warning("Not enough memory to add id\n"); | |
381 | exit(-1); | |
382 | } | |
7c6a1c65 | 383 | |
d6d901c2 ZY |
384 | assert(fd[nr_cpu][counter][thread_index] >= 0); |
385 | fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK); | |
16c8a109 | 386 | |
d6d901c2 ZY |
387 | /* |
388 | * First counter acts as the group leader: | |
389 | */ | |
390 | if (group && group_fd == -1) | |
391 | group_fd = fd[nr_cpu][counter][thread_index]; | |
f250c030 | 392 | |
0e2e63dd PZ |
393 | if (counter || thread_index) { |
394 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
395 | PERF_EVENT_IOC_SET_OUTPUT, | |
396 | fd[nr_cpu][0][0]); | |
397 | if (ret) { | |
398 | error("failed to set output: %d (%s)\n", errno, | |
399 | strerror(errno)); | |
400 | exit(-1); | |
401 | } | |
402 | } else { | |
403 | mmap_array[nr_cpu].counter = counter; | |
404 | mmap_array[nr_cpu].prev = 0; | |
405 | mmap_array[nr_cpu].mask = mmap_pages*page_size - 1; | |
406 | mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size, | |
407 | PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0); | |
408 | if (mmap_array[nr_cpu].base == MAP_FAILED) { | |
409 | error("failed to mmap with %d (%s)\n", errno, strerror(errno)); | |
410 | exit(-1); | |
411 | } | |
412 | ||
413 | event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index]; | |
414 | event_array[nr_poll].events = POLLIN; | |
415 | nr_poll++; | |
ea57c4f5 | 416 | } |
d1302522 | 417 | |
d6d901c2 ZY |
418 | if (filter != NULL) { |
419 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
420 | PERF_EVENT_IOC_SET_FILTER, filter); | |
421 | if (ret) { | |
422 | error("failed to set filter with %d (%s)\n", errno, | |
423 | strerror(errno)); | |
424 | exit(-1); | |
425 | } | |
c171b552 LZ |
426 | } |
427 | } | |
f250c030 | 428 | } |
f2521b6e | 429 | |
d6d901c2 | 430 | static void open_counters(int cpu) |
f250c030 IM |
431 | { |
432 | int counter; | |
16c8a109 | 433 | |
f250c030 IM |
434 | group_fd = -1; |
435 | for (counter = 0; counter < nr_counters; counter++) | |
d6d901c2 | 436 | create_counter(counter, cpu); |
f250c030 | 437 | |
16c8a109 PZ |
438 | nr_cpu++; |
439 | } | |
440 | ||
6122e4e4 ACM |
441 | static int process_buildids(void) |
442 | { | |
443 | u64 size = lseek(output, 0, SEEK_CUR); | |
444 | ||
9f591fd7 ACM |
445 | if (size == 0) |
446 | return 0; | |
447 | ||
6122e4e4 ACM |
448 | session->fd = output; |
449 | return __perf_session__process_events(session, post_processing_offset, | |
450 | size - post_processing_offset, | |
451 | size, &build_id__mark_dso_hit_ops); | |
452 | } | |
453 | ||
f5970550 PZ |
454 | static void atexit_header(void) |
455 | { | |
c7929e47 TZ |
456 | if (!pipe_output) { |
457 | session->header.data_size += bytes_written; | |
f5970550 | 458 | |
baa2f6ce ACM |
459 | if (!no_buildid) |
460 | process_buildids(); | |
c7929e47 | 461 | perf_header__write(&session->header, output, true); |
39d17dac | 462 | perf_session__delete(session); |
d65a458b | 463 | symbol__exit(); |
c7929e47 | 464 | } |
f5970550 PZ |
465 | } |
466 | ||
23346f21 | 467 | static void event__synthesize_guest_os(struct machine *machine, void *data) |
a1645ce1 ZY |
468 | { |
469 | int err; | |
23346f21 | 470 | struct perf_session *psession = data; |
a1645ce1 | 471 | |
23346f21 | 472 | if (machine__is_host(machine)) |
a1645ce1 ZY |
473 | return; |
474 | ||
475 | /* | |
476 | *As for guest kernel when processing subcommand record&report, | |
477 | *we arrange module mmap prior to guest kernel mmap and trigger | |
478 | *a preload dso because default guest module symbols are loaded | |
479 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This | |
480 | *method is used to avoid symbol missing when the first addr is | |
481 | *in module instead of in guest kernel. | |
482 | */ | |
483 | err = event__synthesize_modules(process_synthesized_event, | |
23346f21 | 484 | psession, machine); |
a1645ce1 ZY |
485 | if (err < 0) |
486 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 487 | " relocation symbol.\n", machine->pid); |
a1645ce1 | 488 | |
a1645ce1 ZY |
489 | /* |
490 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms | |
491 | * have no _text sometimes. | |
492 | */ | |
493 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 494 | psession, machine, "_text"); |
a1645ce1 ZY |
495 | if (err < 0) |
496 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 497 | psession, machine, "_stext"); |
a1645ce1 ZY |
498 | if (err < 0) |
499 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 500 | " relocation symbol.\n", machine->pid); |
a1645ce1 ZY |
501 | } |
502 | ||
98402807 FW |
503 | static struct perf_event_header finished_round_event = { |
504 | .size = sizeof(struct perf_event_header), | |
505 | .type = PERF_RECORD_FINISHED_ROUND, | |
506 | }; | |
507 | ||
508 | static void mmap_read_all(void) | |
509 | { | |
0e2e63dd | 510 | int i; |
98402807 FW |
511 | |
512 | for (i = 0; i < nr_cpu; i++) { | |
0e2e63dd PZ |
513 | if (mmap_array[i].base) |
514 | mmap_read(&mmap_array[i]); | |
98402807 FW |
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; |
abaff32a | 525 | int flags; |
4dc0a04b | 526 | int err; |
8b412664 | 527 | unsigned long waking = 0; |
856e9660 | 528 | int child_ready_pipe[2], go_pipe[2]; |
46be604b | 529 | const bool forks = argc > 0; |
856e9660 | 530 | char buf; |
23346f21 | 531 | struct machine *machine; |
de9ac07b PZ |
532 | |
533 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b | 534 | |
f5970550 PZ |
535 | atexit(sig_atexit); |
536 | signal(SIGCHLD, sig_handler); | |
537 | signal(SIGINT, sig_handler); | |
18483b81 | 538 | signal(SIGUSR1, sig_handler); |
f5970550 | 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, |
21ef97f0 | 575 | write_mode == WRITE_FORCE, false, NULL); |
94c744b6 | 576 | if (session == NULL) { |
a9a70bbc ACM |
577 | pr_err("Not enough memory for reading perf file header\n"); |
578 | return -1; | |
579 | } | |
580 | ||
baa2f6ce ACM |
581 | if (!no_buildid) |
582 | perf_header__set_feat(&session->header, HEADER_BUILD_ID); | |
583 | ||
4dc0a04b | 584 | if (!file_new) { |
8dc58101 | 585 | err = perf_header__read(session, output); |
4dc0a04b | 586 | if (err < 0) |
39d17dac | 587 | goto out_delete_session; |
4dc0a04b ACM |
588 | } |
589 | ||
db620b1c | 590 | if (have_tracepoints(attrs, nr_counters)) |
94c744b6 | 591 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
03456a15 | 592 | |
39d17dac ACM |
593 | /* |
594 | * perf_session__delete(session) will be called at atexit_header() | |
595 | */ | |
f5970550 PZ |
596 | atexit(atexit_header); |
597 | ||
d4db3f16 | 598 | if (forks) { |
46be604b | 599 | child_pid = fork(); |
2fb750e8 | 600 | if (child_pid < 0) { |
856e9660 PZ |
601 | perror("failed to fork"); |
602 | exit(-1); | |
603 | } | |
7c6a1c65 | 604 | |
46be604b | 605 | if (!child_pid) { |
529870e3 TZ |
606 | if (pipe_output) |
607 | dup2(2, 1); | |
856e9660 PZ |
608 | close(child_ready_pipe[0]); |
609 | close(go_pipe[1]); | |
610 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
611 | ||
612 | /* | |
613 | * Do a dummy execvp to get the PLT entry resolved, | |
614 | * so we avoid the resolver overhead on the real | |
615 | * execvp call. | |
616 | */ | |
617 | execvp("", (char **)argv); | |
618 | ||
619 | /* | |
620 | * Tell the parent we're ready to go | |
621 | */ | |
622 | close(child_ready_pipe[1]); | |
623 | ||
624 | /* | |
625 | * Wait until the parent tells us to go. | |
626 | */ | |
627 | if (read(go_pipe[0], &buf, 1) == -1) | |
628 | perror("unable to read pipe"); | |
629 | ||
630 | execvp(argv[0], (char **)argv); | |
631 | ||
632 | perror(argv[0]); | |
18483b81 | 633 | kill(getppid(), SIGUSR1); |
856e9660 | 634 | exit(-1); |
0a5ac846 | 635 | } |
856e9660 | 636 | |
d6d901c2 ZY |
637 | if (!system_wide && target_tid == -1 && target_pid == -1) |
638 | all_tids[0] = child_pid; | |
639 | ||
856e9660 PZ |
640 | close(child_ready_pipe[1]); |
641 | close(go_pipe[0]); | |
642 | /* | |
643 | * wait for child to settle | |
644 | */ | |
645 | if (read(child_ready_pipe[0], &buf, 1) == -1) { | |
646 | perror("unable to read pipe"); | |
647 | exit(-1); | |
648 | } | |
649 | close(child_ready_pipe[0]); | |
650 | } | |
651 | ||
c45c6ea2 SE |
652 | nr_cpus = read_cpu_map(cpu_list); |
653 | if (nr_cpus < 1) { | |
0ab7368f | 654 | perror("failed to collect number of CPUs"); |
c45c6ea2 SE |
655 | return -1; |
656 | } | |
657 | ||
658 | if (!system_wide && no_inherit && !cpu_list) { | |
659 | open_counters(-1); | |
856e9660 PZ |
660 | } else { |
661 | for (i = 0; i < nr_cpus; i++) | |
d6d901c2 | 662 | open_counters(cpumap[i]); |
0a5ac846 | 663 | } |
de9ac07b | 664 | |
640c03ce ACM |
665 | perf_session__set_sample_type(session, sample_type); |
666 | ||
529870e3 TZ |
667 | if (pipe_output) { |
668 | err = perf_header__write_pipe(output); | |
669 | if (err < 0) | |
670 | return err; | |
671 | } else if (file_new) { | |
94c744b6 | 672 | err = perf_header__write(&session->header, output, false); |
d5eed904 ACM |
673 | if (err < 0) |
674 | return err; | |
56b03f3c ACM |
675 | } |
676 | ||
6122e4e4 ACM |
677 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
678 | ||
9c90a61c ACM |
679 | perf_session__set_sample_id_all(session, sample_id_all_avail); |
680 | ||
2c46dbb5 TZ |
681 | if (pipe_output) { |
682 | err = event__synthesize_attrs(&session->header, | |
683 | process_synthesized_event, | |
684 | session); | |
685 | if (err < 0) { | |
686 | pr_err("Couldn't synthesize attrs.\n"); | |
687 | return err; | |
688 | } | |
cd19a035 TZ |
689 | |
690 | err = event__synthesize_event_types(process_synthesized_event, | |
691 | session); | |
692 | if (err < 0) { | |
693 | pr_err("Couldn't synthesize event_types.\n"); | |
694 | return err; | |
695 | } | |
9215545e | 696 | |
63e0c771 TZ |
697 | if (have_tracepoints(attrs, nr_counters)) { |
698 | /* | |
699 | * FIXME err <= 0 here actually means that | |
700 | * there were no tracepoints so its not really | |
701 | * an error, just that we don't need to | |
702 | * synthesize anything. We really have to | |
703 | * return this more properly and also | |
704 | * propagate errors that now are calling die() | |
705 | */ | |
706 | err = event__synthesize_tracing_data(output, attrs, | |
707 | nr_counters, | |
708 | process_synthesized_event, | |
709 | session); | |
710 | if (err <= 0) { | |
711 | pr_err("Couldn't record tracing data.\n"); | |
712 | return err; | |
713 | } | |
2c9faa06 | 714 | advance_output(err); |
63e0c771 | 715 | } |
2c46dbb5 TZ |
716 | } |
717 | ||
23346f21 ACM |
718 | machine = perf_session__find_host_machine(session); |
719 | if (!machine) { | |
a1645ce1 ZY |
720 | pr_err("Couldn't find native kernel information.\n"); |
721 | return -1; | |
722 | } | |
723 | ||
56b03f3c | 724 | err = event__synthesize_kernel_mmap(process_synthesized_event, |
23346f21 | 725 | session, machine, "_text"); |
70162138 ACM |
726 | if (err < 0) |
727 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 728 | session, machine, "_stext"); |
c1a3a4b9 ACM |
729 | if (err < 0) |
730 | pr_err("Couldn't record kernel reference relocation symbol\n" | |
731 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
732 | "Check /proc/kallsyms permission or run as root.\n"); | |
b7cece76 | 733 | |
a1645ce1 | 734 | err = event__synthesize_modules(process_synthesized_event, |
23346f21 | 735 | session, machine); |
c1a3a4b9 ACM |
736 | if (err < 0) |
737 | pr_err("Couldn't record kernel module information.\n" | |
738 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
739 | "Check /proc/modules permission or run as root.\n"); | |
740 | ||
a1645ce1 | 741 | if (perf_guest) |
23346f21 | 742 | perf_session__process_machines(session, event__synthesize_guest_os); |
7c6a1c65 | 743 | |
cf103a14 | 744 | if (!system_wide) |
d6d901c2 | 745 | event__synthesize_thread(target_tid, process_synthesized_event, |
d8f66248 | 746 | session); |
234fbbf5 | 747 | else |
d8f66248 | 748 | event__synthesize_threads(process_synthesized_event, session); |
7c6a1c65 | 749 | |
de9ac07b PZ |
750 | if (realtime_prio) { |
751 | struct sched_param param; | |
752 | ||
753 | param.sched_priority = realtime_prio; | |
754 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 755 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
756 | exit(-1); |
757 | } | |
758 | } | |
759 | ||
856e9660 PZ |
760 | /* |
761 | * Let the child rip | |
762 | */ | |
d4db3f16 ACM |
763 | if (forks) |
764 | close(go_pipe[1]); | |
856e9660 | 765 | |
649c48a9 | 766 | for (;;) { |
2debbc83 | 767 | int hits = samples; |
d6d901c2 | 768 | int thread; |
de9ac07b | 769 | |
98402807 | 770 | mmap_read_all(); |
de9ac07b | 771 | |
649c48a9 PZ |
772 | if (hits == samples) { |
773 | if (done) | |
774 | break; | |
4dc0a04b | 775 | err = poll(event_array, nr_poll, -1); |
8b412664 PZ |
776 | waking++; |
777 | } | |
778 | ||
779 | if (done) { | |
780 | for (i = 0; i < nr_cpu; i++) { | |
d6d901c2 ZY |
781 | for (counter = 0; |
782 | counter < nr_counters; | |
783 | counter++) { | |
784 | for (thread = 0; | |
785 | thread < thread_num; | |
786 | thread++) | |
787 | ioctl(fd[i][counter][thread], | |
788 | PERF_EVENT_IOC_DISABLE); | |
789 | } | |
8b412664 | 790 | } |
649c48a9 | 791 | } |
de9ac07b PZ |
792 | } |
793 | ||
18483b81 | 794 | if (quiet || signr == SIGUSR1) |
b44308f5 ACM |
795 | return 0; |
796 | ||
8b412664 PZ |
797 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
798 | ||
021e9f47 IM |
799 | /* |
800 | * Approximate RIP event size: 24 bytes. | |
801 | */ | |
802 | fprintf(stderr, | |
2debbc83 | 803 | "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", |
021e9f47 IM |
804 | (double)bytes_written / 1024.0 / 1024.0, |
805 | output_name, | |
806 | bytes_written / 24); | |
addc2785 | 807 | |
de9ac07b | 808 | return 0; |
39d17dac ACM |
809 | |
810 | out_delete_session: | |
811 | perf_session__delete(session); | |
812 | return err; | |
de9ac07b | 813 | } |
0e9b20b8 | 814 | |
0e9b20b8 | 815 | static const char * const record_usage[] = { |
9e096753 MG |
816 | "perf record [<options>] [<command>]", |
817 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
818 | NULL |
819 | }; | |
820 | ||
7865e817 FW |
821 | static bool force, append_file; |
822 | ||
bca647aa | 823 | const struct option record_options[] = { |
0e9b20b8 | 824 | OPT_CALLBACK('e', "event", NULL, "event", |
86847b62 TG |
825 | "event selector. use 'perf list' to list available events", |
826 | parse_events), | |
c171b552 LZ |
827 | OPT_CALLBACK(0, "filter", NULL, "filter", |
828 | "event filter", parse_filter), | |
0e9b20b8 | 829 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
830 | "record events on existing process id"), |
831 | OPT_INTEGER('t', "tid", &target_tid, | |
832 | "record events on existing thread id"), | |
0e9b20b8 IM |
833 | OPT_INTEGER('r', "realtime", &realtime_prio, |
834 | "collect data with this RT SCHED_FIFO priority"), | |
daac07b2 FW |
835 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
836 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
837 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
838 | "system-wide collection from all CPUs"), | |
abaff32a IM |
839 | OPT_BOOLEAN('A', "append", &append_file, |
840 | "append to the output file to do incremental profiling"), | |
c45c6ea2 SE |
841 | OPT_STRING('C', "cpu", &cpu_list, "cpu", |
842 | "list of cpus to monitor"), | |
97124d5e | 843 | OPT_BOOLEAN('f', "force", &force, |
7865e817 | 844 | "overwrite existing data file (deprecated)"), |
3de29cab | 845 | OPT_U64('c', "count", &user_interval, "event period to sample"), |
abaff32a IM |
846 | OPT_STRING('o', "output", &output_name, "file", |
847 | "output file name"), | |
2e6cdf99 SE |
848 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
849 | "child tasks do not inherit counters"), | |
1967936d ACM |
850 | OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), |
851 | OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), | |
3efa1cc9 IM |
852 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
853 | "do call-graph (stack chain/backtrace) recording"), | |
c0555642 | 854 | OPT_INCR('v', "verbose", &verbose, |
3da297a6 | 855 | "be more verbose (show counter open errors, etc)"), |
b44308f5 | 856 | OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
649c48a9 PZ |
857 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
858 | "per thread counts"), | |
4bba828d AB |
859 | OPT_BOOLEAN('d', "data", &sample_address, |
860 | "Sample addresses"), | |
9c90a61c | 861 | OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"), |
649c48a9 PZ |
862 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
863 | "don't sample"), | |
baa2f6ce | 864 | OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache, |
a1ac1d3c | 865 | "do not update the buildid cache"), |
baa2f6ce ACM |
866 | OPT_BOOLEAN('B', "no-buildid", &no_buildid, |
867 | "do not collect buildids in perf.data"), | |
0e9b20b8 IM |
868 | OPT_END() |
869 | }; | |
870 | ||
f37a291c | 871 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 | 872 | { |
39d17dac | 873 | int i, j, err = -ENOMEM; |
0e9b20b8 | 874 | |
bca647aa | 875 | argc = parse_options(argc, argv, record_options, record_usage, |
655000e7 | 876 | PARSE_OPT_STOP_AT_NON_OPTION); |
d6d901c2 | 877 | if (!argc && target_pid == -1 && target_tid == -1 && |
c45c6ea2 | 878 | !system_wide && !cpu_list) |
bca647aa | 879 | usage_with_options(record_usage, record_options); |
0e9b20b8 | 880 | |
7865e817 FW |
881 | if (force && append_file) { |
882 | fprintf(stderr, "Can't overwrite and append at the same time." | |
883 | " You need to choose between -f and -A"); | |
bca647aa | 884 | usage_with_options(record_usage, record_options); |
7865e817 FW |
885 | } else if (append_file) { |
886 | write_mode = WRITE_APPEND; | |
887 | } else { | |
888 | write_mode = WRITE_FORCE; | |
889 | } | |
890 | ||
655000e7 | 891 | symbol__init(); |
baa2f6ce ACM |
892 | |
893 | if (no_buildid_cache || no_buildid) | |
a1ac1d3c | 894 | disable_buildid_cache(); |
655000e7 | 895 | |
bbd36e5e PZ |
896 | if (!nr_counters) { |
897 | nr_counters = 1; | |
898 | attrs[0].type = PERF_TYPE_HARDWARE; | |
899 | attrs[0].config = PERF_COUNT_HW_CPU_CYCLES; | |
900 | } | |
0e9b20b8 | 901 | |
d6d901c2 ZY |
902 | if (target_pid != -1) { |
903 | target_tid = target_pid; | |
904 | thread_num = find_all_tid(target_pid, &all_tids); | |
905 | if (thread_num <= 0) { | |
906 | fprintf(stderr, "Can't find all threads of pid %d\n", | |
907 | target_pid); | |
bca647aa | 908 | usage_with_options(record_usage, record_options); |
d6d901c2 ZY |
909 | } |
910 | } else { | |
911 | all_tids=malloc(sizeof(pid_t)); | |
912 | if (!all_tids) | |
d65a458b | 913 | goto out_symbol_exit; |
d6d901c2 ZY |
914 | |
915 | all_tids[0] = target_tid; | |
916 | thread_num = 1; | |
917 | } | |
918 | ||
919 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
920 | for (j = 0; j < MAX_COUNTERS; j++) { | |
921 | fd[i][j] = malloc(sizeof(int)*thread_num); | |
0e2e63dd | 922 | if (!fd[i][j]) |
39d17dac | 923 | goto out_free_fd; |
d6d901c2 ZY |
924 | } |
925 | } | |
926 | event_array = malloc( | |
927 | sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num); | |
928 | if (!event_array) | |
39d17dac | 929 | goto out_free_fd; |
d6d901c2 | 930 | |
3de29cab | 931 | if (user_interval != ULLONG_MAX) |
f9212819 FW |
932 | default_interval = user_interval; |
933 | if (user_freq != UINT_MAX) | |
934 | freq = user_freq; | |
935 | ||
7e4ff9e3 MG |
936 | /* |
937 | * User specified count overrides default frequency. | |
938 | */ | |
939 | if (default_interval) | |
940 | freq = 0; | |
941 | else if (freq) { | |
942 | default_interval = freq; | |
943 | } else { | |
944 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
39d17dac ACM |
945 | err = -EINVAL; |
946 | goto out_free_event_array; | |
7e4ff9e3 MG |
947 | } |
948 | ||
39d17dac ACM |
949 | err = __cmd_record(argc, argv); |
950 | ||
951 | out_free_event_array: | |
952 | free(event_array); | |
953 | out_free_fd: | |
954 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
955 | for (j = 0; j < MAX_COUNTERS; j++) | |
956 | free(fd[i][j]); | |
957 | } | |
958 | free(all_tids); | |
959 | all_tids = NULL; | |
d65a458b ACM |
960 | out_symbol_exit: |
961 | symbol__exit(); | |
39d17dac | 962 | return err; |
0e9b20b8 | 963 | } |