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 | 52 | static pid_t target_pid = -1; |
d6d901c2 ZY |
53 | static pid_t target_tid = -1; |
54 | static pid_t *all_tids = NULL; | |
55 | static int thread_num = 0; | |
42e59d7d | 56 | static pid_t child_pid = -1; |
2e6cdf99 | 57 | static bool no_inherit = false; |
7865e817 | 58 | static enum write_mode_t write_mode = WRITE_FORCE; |
c0555642 IM |
59 | static bool call_graph = false; |
60 | static bool inherit_stat = false; | |
61 | static bool no_samples = false; | |
62 | static bool sample_address = false; | |
42e59d7d IM |
63 | |
64 | static long samples = 0; | |
42e59d7d | 65 | static u64 bytes_written = 0; |
a21ca2ca | 66 | |
d6d901c2 | 67 | static struct pollfd *event_array; |
a21ca2ca | 68 | |
42e59d7d IM |
69 | static int nr_poll = 0; |
70 | static int nr_cpu = 0; | |
a21ca2ca | 71 | |
42e59d7d | 72 | static int file_new = 1; |
6122e4e4 | 73 | static off_t post_processing_offset; |
7c6a1c65 | 74 | |
94c744b6 | 75 | static struct perf_session *session; |
c45c6ea2 | 76 | static const char *cpu_list; |
f5970550 | 77 | |
de9ac07b | 78 | struct mmap_data { |
a21ca2ca IM |
79 | int counter; |
80 | void *base; | |
81 | unsigned int mask; | |
82 | unsigned int prev; | |
de9ac07b PZ |
83 | }; |
84 | ||
0e2e63dd | 85 | static struct mmap_data mmap_array[MAX_NR_CPUS]; |
a21ca2ca | 86 | |
9d91a6f7 | 87 | static unsigned long mmap_read_head(struct mmap_data *md) |
de9ac07b | 88 | { |
cdd6c482 | 89 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 | 90 | long head; |
de9ac07b PZ |
91 | |
92 | head = pc->data_head; | |
93 | rmb(); | |
94 | ||
95 | return head; | |
96 | } | |
97 | ||
9d91a6f7 PZ |
98 | static void mmap_write_tail(struct mmap_data *md, unsigned long tail) |
99 | { | |
cdd6c482 | 100 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 PZ |
101 | |
102 | /* | |
103 | * ensure all reads are done before we write the tail out. | |
104 | */ | |
105 | /* mb(); */ | |
106 | pc->data_tail = tail; | |
107 | } | |
108 | ||
9215545e TZ |
109 | static void advance_output(size_t size) |
110 | { | |
111 | bytes_written += size; | |
112 | } | |
113 | ||
f5970550 PZ |
114 | static void write_output(void *buf, size_t size) |
115 | { | |
116 | while (size) { | |
117 | int ret = write(output, buf, size); | |
118 | ||
119 | if (ret < 0) | |
120 | die("failed to write"); | |
121 | ||
122 | size -= ret; | |
123 | buf += ret; | |
124 | ||
125 | bytes_written += ret; | |
126 | } | |
127 | } | |
128 | ||
d8f66248 ACM |
129 | static int process_synthesized_event(event_t *event, |
130 | struct perf_session *self __used) | |
234fbbf5 | 131 | { |
6122e4e4 | 132 | write_output(event, event->header.size); |
234fbbf5 ACM |
133 | return 0; |
134 | } | |
135 | ||
de9ac07b PZ |
136 | static void mmap_read(struct mmap_data *md) |
137 | { | |
138 | unsigned int head = mmap_read_head(md); | |
139 | unsigned int old = md->prev; | |
140 | unsigned char *data = md->base + page_size; | |
141 | unsigned long size; | |
142 | void *buf; | |
143 | int diff; | |
144 | ||
de9ac07b PZ |
145 | /* |
146 | * If we're further behind than half the buffer, there's a chance | |
2debbc83 | 147 | * the writer will bite our tail and mess up the samples under us. |
de9ac07b PZ |
148 | * |
149 | * If we somehow ended up ahead of the head, we got messed up. | |
150 | * | |
151 | * In either case, truncate and restart at head. | |
152 | */ | |
153 | diff = head - old; | |
9d91a6f7 | 154 | if (diff < 0) { |
ef365cef | 155 | fprintf(stderr, "WARNING: failed to keep up with mmap data\n"); |
de9ac07b PZ |
156 | /* |
157 | * head points to a known good entry, start there. | |
158 | */ | |
159 | old = head; | |
160 | } | |
161 | ||
de9ac07b | 162 | if (old != head) |
2debbc83 | 163 | samples++; |
de9ac07b PZ |
164 | |
165 | size = head - old; | |
166 | ||
167 | if ((old & md->mask) + size != (head & md->mask)) { | |
168 | buf = &data[old & md->mask]; | |
169 | size = md->mask + 1 - (old & md->mask); | |
170 | old += size; | |
021e9f47 | 171 | |
6122e4e4 | 172 | write_output(buf, size); |
de9ac07b PZ |
173 | } |
174 | ||
175 | buf = &data[old & md->mask]; | |
176 | size = head - old; | |
177 | old += size; | |
021e9f47 | 178 | |
6122e4e4 | 179 | write_output(buf, size); |
de9ac07b PZ |
180 | |
181 | md->prev = old; | |
9d91a6f7 | 182 | mmap_write_tail(md, old); |
de9ac07b PZ |
183 | } |
184 | ||
185 | static volatile int done = 0; | |
f7b7c26e | 186 | static volatile int signr = -1; |
de9ac07b | 187 | |
16c8a109 | 188 | static void sig_handler(int sig) |
de9ac07b | 189 | { |
16c8a109 | 190 | done = 1; |
f7b7c26e PZ |
191 | signr = sig; |
192 | } | |
193 | ||
194 | static void sig_atexit(void) | |
195 | { | |
933da83a CW |
196 | if (child_pid != -1) |
197 | kill(child_pid, SIGTERM); | |
198 | ||
f7b7c26e PZ |
199 | if (signr == -1) |
200 | return; | |
201 | ||
202 | signal(signr, SIG_DFL); | |
203 | kill(getpid(), signr); | |
de9ac07b PZ |
204 | } |
205 | ||
f250c030 IM |
206 | static int group_fd; |
207 | ||
cdd6c482 | 208 | static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) |
7c6a1c65 PZ |
209 | { |
210 | struct perf_header_attr *h_attr; | |
211 | ||
94c744b6 ACM |
212 | if (nr < session->header.attrs) { |
213 | h_attr = session->header.attr[nr]; | |
7c6a1c65 PZ |
214 | } else { |
215 | h_attr = perf_header_attr__new(a); | |
dc79c0fc | 216 | if (h_attr != NULL) |
94c744b6 | 217 | if (perf_header__add_attr(&session->header, h_attr) < 0) { |
11deb1f9 ACM |
218 | perf_header_attr__delete(h_attr); |
219 | h_attr = NULL; | |
220 | } | |
7c6a1c65 PZ |
221 | } |
222 | ||
223 | return h_attr; | |
224 | } | |
225 | ||
d6d901c2 | 226 | static void create_counter(int counter, int cpu) |
de9ac07b | 227 | { |
c171b552 | 228 | char *filter = filters[counter]; |
cdd6c482 | 229 | struct perf_event_attr *attr = attrs + counter; |
7c6a1c65 PZ |
230 | struct perf_header_attr *h_attr; |
231 | int track = !counter; /* only the first counter needs these */ | |
d6d901c2 | 232 | int thread_index; |
c171b552 | 233 | int ret; |
7c6a1c65 PZ |
234 | struct { |
235 | u64 count; | |
236 | u64 time_enabled; | |
237 | u64 time_running; | |
238 | u64 id; | |
239 | } read_data; | |
240 | ||
241 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
242 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
243 | PERF_FORMAT_ID; | |
16c8a109 | 244 | |
3a9f131f | 245 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 246 | |
8907fd60 EM |
247 | if (nr_counters > 1) |
248 | attr->sample_type |= PERF_SAMPLE_ID; | |
249 | ||
f9212819 FW |
250 | /* |
251 | * We default some events to a 1 default interval. But keep | |
252 | * it a weak assumption overridable by the user. | |
253 | */ | |
254 | if (!attr->sample_period || (user_freq != UINT_MAX && | |
3de29cab | 255 | user_interval != ULLONG_MAX)) { |
f9212819 FW |
256 | if (freq) { |
257 | attr->sample_type |= PERF_SAMPLE_PERIOD; | |
258 | attr->freq = 1; | |
259 | attr->sample_freq = freq; | |
260 | } else { | |
261 | attr->sample_period = default_interval; | |
262 | } | |
1dba15e7 | 263 | } |
3efa1cc9 | 264 | |
649c48a9 PZ |
265 | if (no_samples) |
266 | attr->sample_freq = 0; | |
267 | ||
268 | if (inherit_stat) | |
269 | attr->inherit_stat = 1; | |
270 | ||
3af9e859 | 271 | if (sample_address) { |
4bba828d | 272 | attr->sample_type |= PERF_SAMPLE_ADDR; |
3af9e859 EM |
273 | attr->mmap_data = track; |
274 | } | |
4bba828d | 275 | |
3efa1cc9 IM |
276 | if (call_graph) |
277 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
278 | ||
f60f3593 AS |
279 | if (system_wide) |
280 | attr->sample_type |= PERF_SAMPLE_CPU; | |
281 | ||
cd6feeea | 282 | if (raw_samples) { |
6ddf259d | 283 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 284 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
285 | attr->sample_type |= PERF_SAMPLE_CPU; |
286 | } | |
f413cdb8 | 287 | |
a21ca2ca IM |
288 | attr->mmap = track; |
289 | attr->comm = track; | |
2e6cdf99 SE |
290 | attr->inherit = !no_inherit; |
291 | if (target_pid == -1 && target_tid == -1 && !system_wide) { | |
46be604b | 292 | attr->disabled = 1; |
bedbfdea | 293 | attr->enable_on_exec = 1; |
46be604b | 294 | } |
bedbfdea | 295 | |
d6d901c2 | 296 | for (thread_index = 0; thread_index < thread_num; thread_index++) { |
3da297a6 | 297 | try_again: |
d6d901c2 ZY |
298 | fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr, |
299 | all_tids[thread_index], cpu, group_fd, 0); | |
300 | ||
301 | if (fd[nr_cpu][counter][thread_index] < 0) { | |
302 | int err = errno; | |
303 | ||
304 | if (err == EPERM || err == EACCES) | |
305 | die("Permission error - are you root?\n" | |
306 | "\t Consider tweaking" | |
307 | " /proc/sys/kernel/perf_event_paranoid.\n"); | |
c45c6ea2 | 308 | else if (err == ENODEV && cpu_list) { |
d6d901c2 ZY |
309 | die("No such device - did you specify" |
310 | " an out-of-range profile CPU?\n"); | |
311 | } | |
3da297a6 | 312 | |
d6d901c2 ZY |
313 | /* |
314 | * If it's cycles then fall back to hrtimer | |
315 | * based cpu-clock-tick sw counter, which | |
316 | * is always available even if no PMU support: | |
317 | */ | |
318 | if (attr->type == PERF_TYPE_HARDWARE | |
319 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { | |
320 | ||
321 | if (verbose) | |
322 | warning(" ... trying to fall back to cpu-clock-ticks\n"); | |
323 | attr->type = PERF_TYPE_SOFTWARE; | |
324 | attr->config = PERF_COUNT_SW_CPU_CLOCK; | |
325 | goto try_again; | |
326 | } | |
327 | printf("\n"); | |
328 | error("perfcounter syscall returned with %d (%s)\n", | |
329 | fd[nr_cpu][counter][thread_index], strerror(err)); | |
bfd45118 SK |
330 | |
331 | #if defined(__i386__) || defined(__x86_64__) | |
d6d901c2 ZY |
332 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
333 | die("No hardware sampling interrupt available." | |
334 | " No APIC? If so then you can boot the kernel" | |
335 | " with the \"lapic\" boot parameter to" | |
336 | " force-enable it.\n"); | |
bfd45118 SK |
337 | #endif |
338 | ||
d6d901c2 ZY |
339 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
340 | exit(-1); | |
341 | } | |
3da297a6 | 342 | |
d6d901c2 ZY |
343 | h_attr = get_header_attr(attr, counter); |
344 | if (h_attr == NULL) | |
345 | die("nomem\n"); | |
7c6a1c65 | 346 | |
d6d901c2 ZY |
347 | if (!file_new) { |
348 | if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { | |
349 | fprintf(stderr, "incompatible append\n"); | |
350 | exit(-1); | |
351 | } | |
7c6a1c65 | 352 | } |
7c6a1c65 | 353 | |
d6d901c2 ZY |
354 | if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) { |
355 | perror("Unable to read perf file descriptor\n"); | |
356 | exit(-1); | |
357 | } | |
7c6a1c65 | 358 | |
d6d901c2 ZY |
359 | if (perf_header_attr__add_id(h_attr, read_data.id) < 0) { |
360 | pr_warning("Not enough memory to add id\n"); | |
361 | exit(-1); | |
362 | } | |
7c6a1c65 | 363 | |
d6d901c2 ZY |
364 | assert(fd[nr_cpu][counter][thread_index] >= 0); |
365 | fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK); | |
16c8a109 | 366 | |
d6d901c2 ZY |
367 | /* |
368 | * First counter acts as the group leader: | |
369 | */ | |
370 | if (group && group_fd == -1) | |
371 | group_fd = fd[nr_cpu][counter][thread_index]; | |
f250c030 | 372 | |
0e2e63dd PZ |
373 | if (counter || thread_index) { |
374 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
375 | PERF_EVENT_IOC_SET_OUTPUT, | |
376 | fd[nr_cpu][0][0]); | |
377 | if (ret) { | |
378 | error("failed to set output: %d (%s)\n", errno, | |
379 | strerror(errno)); | |
380 | exit(-1); | |
381 | } | |
382 | } else { | |
383 | mmap_array[nr_cpu].counter = counter; | |
384 | mmap_array[nr_cpu].prev = 0; | |
385 | mmap_array[nr_cpu].mask = mmap_pages*page_size - 1; | |
386 | mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size, | |
387 | PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0); | |
388 | if (mmap_array[nr_cpu].base == MAP_FAILED) { | |
389 | error("failed to mmap with %d (%s)\n", errno, strerror(errno)); | |
390 | exit(-1); | |
391 | } | |
392 | ||
393 | event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index]; | |
394 | event_array[nr_poll].events = POLLIN; | |
395 | nr_poll++; | |
ea57c4f5 | 396 | } |
d1302522 | 397 | |
d6d901c2 ZY |
398 | if (filter != NULL) { |
399 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
400 | PERF_EVENT_IOC_SET_FILTER, filter); | |
401 | if (ret) { | |
402 | error("failed to set filter with %d (%s)\n", errno, | |
403 | strerror(errno)); | |
404 | exit(-1); | |
405 | } | |
c171b552 LZ |
406 | } |
407 | } | |
f250c030 | 408 | } |
f2521b6e | 409 | |
d6d901c2 | 410 | static void open_counters(int cpu) |
f250c030 IM |
411 | { |
412 | int counter; | |
16c8a109 | 413 | |
f250c030 IM |
414 | group_fd = -1; |
415 | for (counter = 0; counter < nr_counters; counter++) | |
d6d901c2 | 416 | create_counter(counter, cpu); |
f250c030 | 417 | |
16c8a109 PZ |
418 | nr_cpu++; |
419 | } | |
420 | ||
6122e4e4 ACM |
421 | static int process_buildids(void) |
422 | { | |
423 | u64 size = lseek(output, 0, SEEK_CUR); | |
424 | ||
9f591fd7 ACM |
425 | if (size == 0) |
426 | return 0; | |
427 | ||
6122e4e4 ACM |
428 | session->fd = output; |
429 | return __perf_session__process_events(session, post_processing_offset, | |
430 | size - post_processing_offset, | |
431 | size, &build_id__mark_dso_hit_ops); | |
432 | } | |
433 | ||
f5970550 PZ |
434 | static void atexit_header(void) |
435 | { | |
c7929e47 TZ |
436 | if (!pipe_output) { |
437 | session->header.data_size += bytes_written; | |
f5970550 | 438 | |
c7929e47 TZ |
439 | process_buildids(); |
440 | perf_header__write(&session->header, output, true); | |
c7929e47 | 441 | } |
f5970550 PZ |
442 | } |
443 | ||
23346f21 | 444 | static void event__synthesize_guest_os(struct machine *machine, void *data) |
a1645ce1 ZY |
445 | { |
446 | int err; | |
447 | char *guest_kallsyms; | |
448 | char path[PATH_MAX]; | |
23346f21 | 449 | struct perf_session *psession = data; |
a1645ce1 | 450 | |
23346f21 | 451 | if (machine__is_host(machine)) |
a1645ce1 ZY |
452 | return; |
453 | ||
454 | /* | |
455 | *As for guest kernel when processing subcommand record&report, | |
456 | *we arrange module mmap prior to guest kernel mmap and trigger | |
457 | *a preload dso because default guest module symbols are loaded | |
458 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This | |
459 | *method is used to avoid symbol missing when the first addr is | |
460 | *in module instead of in guest kernel. | |
461 | */ | |
462 | err = event__synthesize_modules(process_synthesized_event, | |
23346f21 | 463 | psession, machine); |
a1645ce1 ZY |
464 | if (err < 0) |
465 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 466 | " relocation symbol.\n", machine->pid); |
a1645ce1 | 467 | |
23346f21 | 468 | if (machine__is_default_guest(machine)) |
a1645ce1 ZY |
469 | guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms; |
470 | else { | |
23346f21 | 471 | sprintf(path, "%s/proc/kallsyms", machine->root_dir); |
a1645ce1 ZY |
472 | guest_kallsyms = path; |
473 | } | |
474 | ||
475 | /* | |
476 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms | |
477 | * have no _text sometimes. | |
478 | */ | |
479 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 480 | psession, machine, "_text"); |
a1645ce1 ZY |
481 | if (err < 0) |
482 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 483 | psession, machine, "_stext"); |
a1645ce1 ZY |
484 | if (err < 0) |
485 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 486 | " relocation symbol.\n", machine->pid); |
a1645ce1 ZY |
487 | } |
488 | ||
98402807 FW |
489 | static struct perf_event_header finished_round_event = { |
490 | .size = sizeof(struct perf_event_header), | |
491 | .type = PERF_RECORD_FINISHED_ROUND, | |
492 | }; | |
493 | ||
494 | static void mmap_read_all(void) | |
495 | { | |
0e2e63dd | 496 | int i; |
98402807 FW |
497 | |
498 | for (i = 0; i < nr_cpu; i++) { | |
0e2e63dd PZ |
499 | if (mmap_array[i].base) |
500 | mmap_read(&mmap_array[i]); | |
98402807 FW |
501 | } |
502 | ||
503 | if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) | |
504 | write_output(&finished_round_event, sizeof(finished_round_event)); | |
505 | } | |
506 | ||
d4db3f16 | 507 | static int __cmd_record(int argc, const char **argv) |
16c8a109 PZ |
508 | { |
509 | int i, counter; | |
abaff32a | 510 | struct stat st; |
abaff32a | 511 | int flags; |
4dc0a04b | 512 | int err; |
8b412664 | 513 | unsigned long waking = 0; |
856e9660 | 514 | int child_ready_pipe[2], go_pipe[2]; |
46be604b | 515 | const bool forks = argc > 0; |
856e9660 | 516 | char buf; |
23346f21 | 517 | struct machine *machine; |
de9ac07b PZ |
518 | |
519 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b | 520 | |
f5970550 PZ |
521 | atexit(sig_atexit); |
522 | signal(SIGCHLD, sig_handler); | |
523 | signal(SIGINT, sig_handler); | |
524 | ||
d4db3f16 | 525 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
856e9660 PZ |
526 | perror("failed to create pipes"); |
527 | exit(-1); | |
528 | } | |
529 | ||
529870e3 TZ |
530 | if (!strcmp(output_name, "-")) |
531 | pipe_output = 1; | |
532 | else if (!stat(output_name, &st) && st.st_size) { | |
7865e817 | 533 | if (write_mode == WRITE_FORCE) { |
b38d3464 ACM |
534 | char oldname[PATH_MAX]; |
535 | snprintf(oldname, sizeof(oldname), "%s.old", | |
536 | output_name); | |
537 | unlink(oldname); | |
538 | rename(output_name, oldname); | |
266e0e21 | 539 | } |
7865e817 FW |
540 | } else if (write_mode == WRITE_APPEND) { |
541 | write_mode = WRITE_FORCE; | |
97124d5e PZ |
542 | } |
543 | ||
f887f301 | 544 | flags = O_CREAT|O_RDWR; |
7865e817 | 545 | if (write_mode == WRITE_APPEND) |
f5970550 | 546 | file_new = 0; |
abaff32a IM |
547 | else |
548 | flags |= O_TRUNC; | |
549 | ||
529870e3 TZ |
550 | if (pipe_output) |
551 | output = STDOUT_FILENO; | |
552 | else | |
553 | output = open(output_name, flags, S_IRUSR | S_IWUSR); | |
de9ac07b PZ |
554 | if (output < 0) { |
555 | perror("failed to create output file"); | |
556 | exit(-1); | |
557 | } | |
558 | ||
7865e817 | 559 | session = perf_session__new(output_name, O_WRONLY, |
454c407e | 560 | write_mode == WRITE_FORCE, false); |
94c744b6 | 561 | if (session == NULL) { |
a9a70bbc ACM |
562 | pr_err("Not enough memory for reading perf file header\n"); |
563 | return -1; | |
564 | } | |
565 | ||
4dc0a04b | 566 | if (!file_new) { |
8dc58101 | 567 | err = perf_header__read(session, output); |
4dc0a04b ACM |
568 | if (err < 0) |
569 | return err; | |
570 | } | |
571 | ||
db620b1c | 572 | if (have_tracepoints(attrs, nr_counters)) |
94c744b6 | 573 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
03456a15 | 574 | |
f5970550 PZ |
575 | atexit(atexit_header); |
576 | ||
d4db3f16 | 577 | if (forks) { |
46be604b | 578 | child_pid = fork(); |
2fb750e8 | 579 | if (child_pid < 0) { |
856e9660 PZ |
580 | perror("failed to fork"); |
581 | exit(-1); | |
582 | } | |
7c6a1c65 | 583 | |
46be604b | 584 | if (!child_pid) { |
529870e3 TZ |
585 | if (pipe_output) |
586 | dup2(2, 1); | |
856e9660 PZ |
587 | close(child_ready_pipe[0]); |
588 | close(go_pipe[1]); | |
589 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
590 | ||
591 | /* | |
592 | * Do a dummy execvp to get the PLT entry resolved, | |
593 | * so we avoid the resolver overhead on the real | |
594 | * execvp call. | |
595 | */ | |
596 | execvp("", (char **)argv); | |
597 | ||
598 | /* | |
599 | * Tell the parent we're ready to go | |
600 | */ | |
601 | close(child_ready_pipe[1]); | |
602 | ||
603 | /* | |
604 | * Wait until the parent tells us to go. | |
605 | */ | |
606 | if (read(go_pipe[0], &buf, 1) == -1) | |
607 | perror("unable to read pipe"); | |
608 | ||
609 | execvp(argv[0], (char **)argv); | |
610 | ||
611 | perror(argv[0]); | |
612 | exit(-1); | |
0a5ac846 | 613 | } |
856e9660 | 614 | |
d6d901c2 ZY |
615 | if (!system_wide && target_tid == -1 && target_pid == -1) |
616 | all_tids[0] = child_pid; | |
617 | ||
856e9660 PZ |
618 | close(child_ready_pipe[1]); |
619 | close(go_pipe[0]); | |
620 | /* | |
621 | * wait for child to settle | |
622 | */ | |
623 | if (read(child_ready_pipe[0], &buf, 1) == -1) { | |
624 | perror("unable to read pipe"); | |
625 | exit(-1); | |
626 | } | |
627 | close(child_ready_pipe[0]); | |
628 | } | |
629 | ||
c45c6ea2 SE |
630 | nr_cpus = read_cpu_map(cpu_list); |
631 | if (nr_cpus < 1) { | |
632 | perror("failed to collect number of CPUs\n"); | |
633 | return -1; | |
634 | } | |
635 | ||
636 | if (!system_wide && no_inherit && !cpu_list) { | |
637 | open_counters(-1); | |
856e9660 PZ |
638 | } else { |
639 | for (i = 0; i < nr_cpus; i++) | |
d6d901c2 | 640 | open_counters(cpumap[i]); |
0a5ac846 | 641 | } |
de9ac07b | 642 | |
529870e3 TZ |
643 | if (pipe_output) { |
644 | err = perf_header__write_pipe(output); | |
645 | if (err < 0) | |
646 | return err; | |
647 | } else if (file_new) { | |
94c744b6 | 648 | err = perf_header__write(&session->header, output, false); |
d5eed904 ACM |
649 | if (err < 0) |
650 | return err; | |
56b03f3c ACM |
651 | } |
652 | ||
6122e4e4 ACM |
653 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
654 | ||
2c46dbb5 TZ |
655 | if (pipe_output) { |
656 | err = event__synthesize_attrs(&session->header, | |
657 | process_synthesized_event, | |
658 | session); | |
659 | if (err < 0) { | |
660 | pr_err("Couldn't synthesize attrs.\n"); | |
661 | return err; | |
662 | } | |
cd19a035 TZ |
663 | |
664 | err = event__synthesize_event_types(process_synthesized_event, | |
665 | session); | |
666 | if (err < 0) { | |
667 | pr_err("Couldn't synthesize event_types.\n"); | |
668 | return err; | |
669 | } | |
9215545e | 670 | |
63e0c771 TZ |
671 | if (have_tracepoints(attrs, nr_counters)) { |
672 | /* | |
673 | * FIXME err <= 0 here actually means that | |
674 | * there were no tracepoints so its not really | |
675 | * an error, just that we don't need to | |
676 | * synthesize anything. We really have to | |
677 | * return this more properly and also | |
678 | * propagate errors that now are calling die() | |
679 | */ | |
680 | err = event__synthesize_tracing_data(output, attrs, | |
681 | nr_counters, | |
682 | process_synthesized_event, | |
683 | session); | |
684 | if (err <= 0) { | |
685 | pr_err("Couldn't record tracing data.\n"); | |
686 | return err; | |
687 | } | |
2c9faa06 | 688 | advance_output(err); |
63e0c771 | 689 | } |
2c46dbb5 TZ |
690 | } |
691 | ||
23346f21 ACM |
692 | machine = perf_session__find_host_machine(session); |
693 | if (!machine) { | |
a1645ce1 ZY |
694 | pr_err("Couldn't find native kernel information.\n"); |
695 | return -1; | |
696 | } | |
697 | ||
56b03f3c | 698 | err = event__synthesize_kernel_mmap(process_synthesized_event, |
23346f21 | 699 | session, machine, "_text"); |
70162138 ACM |
700 | if (err < 0) |
701 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 702 | session, machine, "_stext"); |
56b03f3c ACM |
703 | if (err < 0) { |
704 | pr_err("Couldn't record kernel reference relocation symbol.\n"); | |
705 | return err; | |
b7cece76 ACM |
706 | } |
707 | ||
a1645ce1 | 708 | err = event__synthesize_modules(process_synthesized_event, |
23346f21 | 709 | session, machine); |
b7cece76 ACM |
710 | if (err < 0) { |
711 | pr_err("Couldn't record kernel reference relocation symbol.\n"); | |
712 | return err; | |
d5eed904 | 713 | } |
a1645ce1 | 714 | if (perf_guest) |
23346f21 | 715 | perf_session__process_machines(session, event__synthesize_guest_os); |
7c6a1c65 | 716 | |
c45c6ea2 | 717 | if (!system_wide && cpu_list) |
d6d901c2 | 718 | event__synthesize_thread(target_tid, process_synthesized_event, |
d8f66248 | 719 | session); |
234fbbf5 | 720 | else |
d8f66248 | 721 | event__synthesize_threads(process_synthesized_event, session); |
7c6a1c65 | 722 | |
de9ac07b PZ |
723 | if (realtime_prio) { |
724 | struct sched_param param; | |
725 | ||
726 | param.sched_priority = realtime_prio; | |
727 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 728 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
729 | exit(-1); |
730 | } | |
731 | } | |
732 | ||
856e9660 PZ |
733 | /* |
734 | * Let the child rip | |
735 | */ | |
d4db3f16 ACM |
736 | if (forks) |
737 | close(go_pipe[1]); | |
856e9660 | 738 | |
649c48a9 | 739 | for (;;) { |
2debbc83 | 740 | int hits = samples; |
d6d901c2 | 741 | int thread; |
de9ac07b | 742 | |
98402807 | 743 | mmap_read_all(); |
de9ac07b | 744 | |
649c48a9 PZ |
745 | if (hits == samples) { |
746 | if (done) | |
747 | break; | |
4dc0a04b | 748 | err = poll(event_array, nr_poll, -1); |
8b412664 PZ |
749 | waking++; |
750 | } | |
751 | ||
752 | if (done) { | |
753 | for (i = 0; i < nr_cpu; i++) { | |
d6d901c2 ZY |
754 | for (counter = 0; |
755 | counter < nr_counters; | |
756 | counter++) { | |
757 | for (thread = 0; | |
758 | thread < thread_num; | |
759 | thread++) | |
760 | ioctl(fd[i][counter][thread], | |
761 | PERF_EVENT_IOC_DISABLE); | |
762 | } | |
8b412664 | 763 | } |
649c48a9 | 764 | } |
de9ac07b PZ |
765 | } |
766 | ||
8b412664 PZ |
767 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
768 | ||
021e9f47 IM |
769 | /* |
770 | * Approximate RIP event size: 24 bytes. | |
771 | */ | |
772 | fprintf(stderr, | |
2debbc83 | 773 | "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", |
021e9f47 IM |
774 | (double)bytes_written / 1024.0 / 1024.0, |
775 | output_name, | |
776 | bytes_written / 24); | |
addc2785 | 777 | |
de9ac07b PZ |
778 | return 0; |
779 | } | |
0e9b20b8 | 780 | |
0e9b20b8 | 781 | static const char * const record_usage[] = { |
9e096753 MG |
782 | "perf record [<options>] [<command>]", |
783 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
784 | NULL |
785 | }; | |
786 | ||
7865e817 FW |
787 | static bool force, append_file; |
788 | ||
5242519b | 789 | static const struct option options[] = { |
0e9b20b8 | 790 | OPT_CALLBACK('e', "event", NULL, "event", |
86847b62 TG |
791 | "event selector. use 'perf list' to list available events", |
792 | parse_events), | |
c171b552 LZ |
793 | OPT_CALLBACK(0, "filter", NULL, "filter", |
794 | "event filter", parse_filter), | |
0e9b20b8 | 795 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
796 | "record events on existing process id"), |
797 | OPT_INTEGER('t', "tid", &target_tid, | |
798 | "record events on existing thread id"), | |
0e9b20b8 IM |
799 | OPT_INTEGER('r', "realtime", &realtime_prio, |
800 | "collect data with this RT SCHED_FIFO priority"), | |
daac07b2 FW |
801 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
802 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
803 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
804 | "system-wide collection from all CPUs"), | |
abaff32a IM |
805 | OPT_BOOLEAN('A', "append", &append_file, |
806 | "append to the output file to do incremental profiling"), | |
c45c6ea2 SE |
807 | OPT_STRING('C', "cpu", &cpu_list, "cpu", |
808 | "list of cpus to monitor"), | |
97124d5e | 809 | OPT_BOOLEAN('f', "force", &force, |
7865e817 | 810 | "overwrite existing data file (deprecated)"), |
3de29cab | 811 | OPT_U64('c', "count", &user_interval, "event period to sample"), |
abaff32a IM |
812 | OPT_STRING('o', "output", &output_name, "file", |
813 | "output file name"), | |
2e6cdf99 SE |
814 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
815 | "child tasks do not inherit counters"), | |
1967936d ACM |
816 | OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), |
817 | OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), | |
3efa1cc9 IM |
818 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
819 | "do call-graph (stack chain/backtrace) recording"), | |
c0555642 | 820 | OPT_INCR('v', "verbose", &verbose, |
3da297a6 | 821 | "be more verbose (show counter open errors, etc)"), |
649c48a9 PZ |
822 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
823 | "per thread counts"), | |
4bba828d AB |
824 | OPT_BOOLEAN('d', "data", &sample_address, |
825 | "Sample addresses"), | |
649c48a9 PZ |
826 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
827 | "don't sample"), | |
0e9b20b8 IM |
828 | OPT_END() |
829 | }; | |
830 | ||
f37a291c | 831 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 | 832 | { |
d6d901c2 | 833 | int i,j; |
0e9b20b8 | 834 | |
a0541234 | 835 | argc = parse_options(argc, argv, options, record_usage, |
655000e7 | 836 | PARSE_OPT_STOP_AT_NON_OPTION); |
d6d901c2 | 837 | if (!argc && target_pid == -1 && target_tid == -1 && |
c45c6ea2 | 838 | !system_wide && !cpu_list) |
0e9b20b8 IM |
839 | usage_with_options(record_usage, options); |
840 | ||
7865e817 FW |
841 | if (force && append_file) { |
842 | fprintf(stderr, "Can't overwrite and append at the same time." | |
843 | " You need to choose between -f and -A"); | |
844 | usage_with_options(record_usage, options); | |
845 | } else if (append_file) { | |
846 | write_mode = WRITE_APPEND; | |
847 | } else { | |
848 | write_mode = WRITE_FORCE; | |
849 | } | |
850 | ||
655000e7 ACM |
851 | symbol__init(); |
852 | ||
bbd36e5e PZ |
853 | if (!nr_counters) { |
854 | nr_counters = 1; | |
855 | attrs[0].type = PERF_TYPE_HARDWARE; | |
856 | attrs[0].config = PERF_COUNT_HW_CPU_CYCLES; | |
857 | } | |
0e9b20b8 | 858 | |
d6d901c2 ZY |
859 | if (target_pid != -1) { |
860 | target_tid = target_pid; | |
861 | thread_num = find_all_tid(target_pid, &all_tids); | |
862 | if (thread_num <= 0) { | |
863 | fprintf(stderr, "Can't find all threads of pid %d\n", | |
864 | target_pid); | |
865 | usage_with_options(record_usage, options); | |
866 | } | |
867 | } else { | |
868 | all_tids=malloc(sizeof(pid_t)); | |
869 | if (!all_tids) | |
870 | return -ENOMEM; | |
871 | ||
872 | all_tids[0] = target_tid; | |
873 | thread_num = 1; | |
874 | } | |
875 | ||
876 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
877 | for (j = 0; j < MAX_COUNTERS; j++) { | |
878 | fd[i][j] = malloc(sizeof(int)*thread_num); | |
0e2e63dd | 879 | if (!fd[i][j]) |
d6d901c2 ZY |
880 | return -ENOMEM; |
881 | } | |
882 | } | |
883 | event_array = malloc( | |
884 | sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num); | |
885 | if (!event_array) | |
886 | return -ENOMEM; | |
887 | ||
3de29cab | 888 | if (user_interval != ULLONG_MAX) |
f9212819 FW |
889 | default_interval = user_interval; |
890 | if (user_freq != UINT_MAX) | |
891 | freq = user_freq; | |
892 | ||
7e4ff9e3 MG |
893 | /* |
894 | * User specified count overrides default frequency. | |
895 | */ | |
896 | if (default_interval) | |
897 | freq = 0; | |
898 | else if (freq) { | |
899 | default_interval = freq; | |
900 | } else { | |
901 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
902 | exit(EXIT_FAILURE); | |
903 | } | |
904 | ||
0e9b20b8 IM |
905 | return __cmd_record(argc, argv); |
906 | } |