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; | |
a1ac1d3c | 63 | static bool no_buildid = false; |
baa2f6ce | 64 | static bool no_buildid_cache = false; |
42e59d7d IM |
65 | |
66 | static long samples = 0; | |
42e59d7d | 67 | static u64 bytes_written = 0; |
a21ca2ca | 68 | |
d6d901c2 | 69 | static struct pollfd *event_array; |
a21ca2ca | 70 | |
42e59d7d IM |
71 | static int nr_poll = 0; |
72 | static int nr_cpu = 0; | |
a21ca2ca | 73 | |
42e59d7d | 74 | static int file_new = 1; |
6122e4e4 | 75 | static off_t post_processing_offset; |
7c6a1c65 | 76 | |
94c744b6 | 77 | static struct perf_session *session; |
c45c6ea2 | 78 | static const char *cpu_list; |
f5970550 | 79 | |
de9ac07b | 80 | struct mmap_data { |
a21ca2ca IM |
81 | int counter; |
82 | void *base; | |
83 | unsigned int mask; | |
84 | unsigned int prev; | |
de9ac07b PZ |
85 | }; |
86 | ||
0e2e63dd | 87 | static struct mmap_data mmap_array[MAX_NR_CPUS]; |
a21ca2ca | 88 | |
9d91a6f7 | 89 | static unsigned long mmap_read_head(struct mmap_data *md) |
de9ac07b | 90 | { |
cdd6c482 | 91 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 | 92 | long head; |
de9ac07b PZ |
93 | |
94 | head = pc->data_head; | |
95 | rmb(); | |
96 | ||
97 | return head; | |
98 | } | |
99 | ||
9d91a6f7 PZ |
100 | static void mmap_write_tail(struct mmap_data *md, unsigned long tail) |
101 | { | |
cdd6c482 | 102 | struct perf_event_mmap_page *pc = md->base; |
9d91a6f7 PZ |
103 | |
104 | /* | |
105 | * ensure all reads are done before we write the tail out. | |
106 | */ | |
107 | /* mb(); */ | |
108 | pc->data_tail = tail; | |
109 | } | |
110 | ||
9215545e TZ |
111 | static void advance_output(size_t size) |
112 | { | |
113 | bytes_written += size; | |
114 | } | |
115 | ||
f5970550 PZ |
116 | static void write_output(void *buf, size_t size) |
117 | { | |
118 | while (size) { | |
119 | int ret = write(output, buf, size); | |
120 | ||
121 | if (ret < 0) | |
122 | die("failed to write"); | |
123 | ||
124 | size -= ret; | |
125 | buf += ret; | |
126 | ||
127 | bytes_written += ret; | |
128 | } | |
129 | } | |
130 | ||
d8f66248 ACM |
131 | static int process_synthesized_event(event_t *event, |
132 | struct perf_session *self __used) | |
234fbbf5 | 133 | { |
6122e4e4 | 134 | write_output(event, event->header.size); |
234fbbf5 ACM |
135 | return 0; |
136 | } | |
137 | ||
de9ac07b PZ |
138 | static void mmap_read(struct mmap_data *md) |
139 | { | |
140 | unsigned int head = mmap_read_head(md); | |
141 | unsigned int old = md->prev; | |
142 | unsigned char *data = md->base + page_size; | |
143 | unsigned long size; | |
144 | void *buf; | |
145 | int diff; | |
146 | ||
de9ac07b PZ |
147 | /* |
148 | * If we're further behind than half the buffer, there's a chance | |
2debbc83 | 149 | * the writer will bite our tail and mess up the samples under us. |
de9ac07b PZ |
150 | * |
151 | * If we somehow ended up ahead of the head, we got messed up. | |
152 | * | |
153 | * In either case, truncate and restart at head. | |
154 | */ | |
155 | diff = head - old; | |
9d91a6f7 | 156 | if (diff < 0) { |
ef365cef | 157 | fprintf(stderr, "WARNING: failed to keep up with mmap data\n"); |
de9ac07b PZ |
158 | /* |
159 | * head points to a known good entry, start there. | |
160 | */ | |
161 | old = head; | |
162 | } | |
163 | ||
de9ac07b | 164 | if (old != head) |
2debbc83 | 165 | samples++; |
de9ac07b PZ |
166 | |
167 | size = head - old; | |
168 | ||
169 | if ((old & md->mask) + size != (head & md->mask)) { | |
170 | buf = &data[old & md->mask]; | |
171 | size = md->mask + 1 - (old & md->mask); | |
172 | old += size; | |
021e9f47 | 173 | |
6122e4e4 | 174 | write_output(buf, size); |
de9ac07b PZ |
175 | } |
176 | ||
177 | buf = &data[old & md->mask]; | |
178 | size = head - old; | |
179 | old += size; | |
021e9f47 | 180 | |
6122e4e4 | 181 | write_output(buf, size); |
de9ac07b PZ |
182 | |
183 | md->prev = old; | |
9d91a6f7 | 184 | mmap_write_tail(md, old); |
de9ac07b PZ |
185 | } |
186 | ||
187 | static volatile int done = 0; | |
f7b7c26e | 188 | static volatile int signr = -1; |
de9ac07b | 189 | |
16c8a109 | 190 | static void sig_handler(int sig) |
de9ac07b | 191 | { |
16c8a109 | 192 | done = 1; |
f7b7c26e PZ |
193 | signr = sig; |
194 | } | |
195 | ||
196 | static void sig_atexit(void) | |
197 | { | |
5ffc8881 | 198 | if (child_pid > 0) |
933da83a CW |
199 | kill(child_pid, SIGTERM); |
200 | ||
f7b7c26e PZ |
201 | if (signr == -1) |
202 | return; | |
203 | ||
204 | signal(signr, SIG_DFL); | |
205 | kill(getpid(), signr); | |
de9ac07b PZ |
206 | } |
207 | ||
f250c030 IM |
208 | static int group_fd; |
209 | ||
cdd6c482 | 210 | static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) |
7c6a1c65 PZ |
211 | { |
212 | struct perf_header_attr *h_attr; | |
213 | ||
94c744b6 ACM |
214 | if (nr < session->header.attrs) { |
215 | h_attr = session->header.attr[nr]; | |
7c6a1c65 PZ |
216 | } else { |
217 | h_attr = perf_header_attr__new(a); | |
dc79c0fc | 218 | if (h_attr != NULL) |
94c744b6 | 219 | if (perf_header__add_attr(&session->header, h_attr) < 0) { |
11deb1f9 ACM |
220 | perf_header_attr__delete(h_attr); |
221 | h_attr = NULL; | |
222 | } | |
7c6a1c65 PZ |
223 | } |
224 | ||
225 | return h_attr; | |
226 | } | |
227 | ||
d6d901c2 | 228 | static void create_counter(int counter, int cpu) |
de9ac07b | 229 | { |
c171b552 | 230 | char *filter = filters[counter]; |
cdd6c482 | 231 | struct perf_event_attr *attr = attrs + counter; |
7c6a1c65 PZ |
232 | struct perf_header_attr *h_attr; |
233 | int track = !counter; /* only the first counter needs these */ | |
d6d901c2 | 234 | int thread_index; |
c171b552 | 235 | int ret; |
7c6a1c65 PZ |
236 | struct { |
237 | u64 count; | |
238 | u64 time_enabled; | |
239 | u64 time_running; | |
240 | u64 id; | |
241 | } read_data; | |
242 | ||
243 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
244 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
245 | PERF_FORMAT_ID; | |
16c8a109 | 246 | |
3a9f131f | 247 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 248 | |
8907fd60 EM |
249 | if (nr_counters > 1) |
250 | attr->sample_type |= PERF_SAMPLE_ID; | |
251 | ||
f9212819 FW |
252 | /* |
253 | * We default some events to a 1 default interval. But keep | |
254 | * it a weak assumption overridable by the user. | |
255 | */ | |
256 | if (!attr->sample_period || (user_freq != UINT_MAX && | |
3de29cab | 257 | user_interval != ULLONG_MAX)) { |
f9212819 FW |
258 | if (freq) { |
259 | attr->sample_type |= PERF_SAMPLE_PERIOD; | |
260 | attr->freq = 1; | |
261 | attr->sample_freq = freq; | |
262 | } else { | |
263 | attr->sample_period = default_interval; | |
264 | } | |
1dba15e7 | 265 | } |
3efa1cc9 | 266 | |
649c48a9 PZ |
267 | if (no_samples) |
268 | attr->sample_freq = 0; | |
269 | ||
270 | if (inherit_stat) | |
271 | attr->inherit_stat = 1; | |
272 | ||
3af9e859 | 273 | if (sample_address) { |
4bba828d | 274 | attr->sample_type |= PERF_SAMPLE_ADDR; |
3af9e859 EM |
275 | attr->mmap_data = track; |
276 | } | |
4bba828d | 277 | |
3efa1cc9 IM |
278 | if (call_graph) |
279 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
280 | ||
f60f3593 AS |
281 | if (system_wide) |
282 | attr->sample_type |= PERF_SAMPLE_CPU; | |
283 | ||
cd6feeea | 284 | if (raw_samples) { |
6ddf259d | 285 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 286 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
287 | attr->sample_type |= PERF_SAMPLE_CPU; |
288 | } | |
f413cdb8 | 289 | |
a21ca2ca IM |
290 | attr->mmap = track; |
291 | attr->comm = track; | |
2e6cdf99 SE |
292 | attr->inherit = !no_inherit; |
293 | if (target_pid == -1 && target_tid == -1 && !system_wide) { | |
46be604b | 294 | attr->disabled = 1; |
bedbfdea | 295 | attr->enable_on_exec = 1; |
46be604b | 296 | } |
bedbfdea | 297 | |
d6d901c2 | 298 | for (thread_index = 0; thread_index < thread_num; thread_index++) { |
3da297a6 | 299 | try_again: |
d6d901c2 ZY |
300 | fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr, |
301 | all_tids[thread_index], cpu, group_fd, 0); | |
302 | ||
303 | if (fd[nr_cpu][counter][thread_index] < 0) { | |
304 | int err = errno; | |
305 | ||
306 | if (err == EPERM || err == EACCES) | |
307 | die("Permission error - are you root?\n" | |
308 | "\t Consider tweaking" | |
309 | " /proc/sys/kernel/perf_event_paranoid.\n"); | |
c45c6ea2 | 310 | else if (err == ENODEV && cpu_list) { |
d6d901c2 ZY |
311 | die("No such device - did you specify" |
312 | " an out-of-range profile CPU?\n"); | |
313 | } | |
3da297a6 | 314 | |
d6d901c2 ZY |
315 | /* |
316 | * If it's cycles then fall back to hrtimer | |
317 | * based cpu-clock-tick sw counter, which | |
318 | * is always available even if no PMU support: | |
319 | */ | |
320 | if (attr->type == PERF_TYPE_HARDWARE | |
321 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { | |
322 | ||
323 | if (verbose) | |
324 | warning(" ... trying to fall back to cpu-clock-ticks\n"); | |
325 | attr->type = PERF_TYPE_SOFTWARE; | |
326 | attr->config = PERF_COUNT_SW_CPU_CLOCK; | |
327 | goto try_again; | |
328 | } | |
329 | printf("\n"); | |
d9cf837e | 330 | error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", |
d6d901c2 | 331 | fd[nr_cpu][counter][thread_index], strerror(err)); |
bfd45118 SK |
332 | |
333 | #if defined(__i386__) || defined(__x86_64__) | |
d6d901c2 ZY |
334 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
335 | die("No hardware sampling interrupt available." | |
336 | " No APIC? If so then you can boot the kernel" | |
337 | " with the \"lapic\" boot parameter to" | |
338 | " force-enable it.\n"); | |
bfd45118 SK |
339 | #endif |
340 | ||
d6d901c2 ZY |
341 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
342 | exit(-1); | |
343 | } | |
3da297a6 | 344 | |
d6d901c2 ZY |
345 | h_attr = get_header_attr(attr, counter); |
346 | if (h_attr == NULL) | |
347 | die("nomem\n"); | |
7c6a1c65 | 348 | |
d6d901c2 ZY |
349 | if (!file_new) { |
350 | if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { | |
351 | fprintf(stderr, "incompatible append\n"); | |
352 | exit(-1); | |
353 | } | |
7c6a1c65 | 354 | } |
7c6a1c65 | 355 | |
d6d901c2 | 356 | if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) { |
0ab7368f | 357 | perror("Unable to read perf file descriptor"); |
d6d901c2 ZY |
358 | exit(-1); |
359 | } | |
7c6a1c65 | 360 | |
d6d901c2 ZY |
361 | if (perf_header_attr__add_id(h_attr, read_data.id) < 0) { |
362 | pr_warning("Not enough memory to add id\n"); | |
363 | exit(-1); | |
364 | } | |
7c6a1c65 | 365 | |
d6d901c2 ZY |
366 | assert(fd[nr_cpu][counter][thread_index] >= 0); |
367 | fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK); | |
16c8a109 | 368 | |
d6d901c2 ZY |
369 | /* |
370 | * First counter acts as the group leader: | |
371 | */ | |
372 | if (group && group_fd == -1) | |
373 | group_fd = fd[nr_cpu][counter][thread_index]; | |
f250c030 | 374 | |
0e2e63dd PZ |
375 | if (counter || thread_index) { |
376 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
377 | PERF_EVENT_IOC_SET_OUTPUT, | |
378 | fd[nr_cpu][0][0]); | |
379 | if (ret) { | |
380 | error("failed to set output: %d (%s)\n", errno, | |
381 | strerror(errno)); | |
382 | exit(-1); | |
383 | } | |
384 | } else { | |
385 | mmap_array[nr_cpu].counter = counter; | |
386 | mmap_array[nr_cpu].prev = 0; | |
387 | mmap_array[nr_cpu].mask = mmap_pages*page_size - 1; | |
388 | mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size, | |
389 | PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0); | |
390 | if (mmap_array[nr_cpu].base == MAP_FAILED) { | |
391 | error("failed to mmap with %d (%s)\n", errno, strerror(errno)); | |
392 | exit(-1); | |
393 | } | |
394 | ||
395 | event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index]; | |
396 | event_array[nr_poll].events = POLLIN; | |
397 | nr_poll++; | |
ea57c4f5 | 398 | } |
d1302522 | 399 | |
d6d901c2 ZY |
400 | if (filter != NULL) { |
401 | ret = ioctl(fd[nr_cpu][counter][thread_index], | |
402 | PERF_EVENT_IOC_SET_FILTER, filter); | |
403 | if (ret) { | |
404 | error("failed to set filter with %d (%s)\n", errno, | |
405 | strerror(errno)); | |
406 | exit(-1); | |
407 | } | |
c171b552 LZ |
408 | } |
409 | } | |
f250c030 | 410 | } |
f2521b6e | 411 | |
d6d901c2 | 412 | static void open_counters(int cpu) |
f250c030 IM |
413 | { |
414 | int counter; | |
16c8a109 | 415 | |
f250c030 IM |
416 | group_fd = -1; |
417 | for (counter = 0; counter < nr_counters; counter++) | |
d6d901c2 | 418 | create_counter(counter, cpu); |
f250c030 | 419 | |
16c8a109 PZ |
420 | nr_cpu++; |
421 | } | |
422 | ||
6122e4e4 ACM |
423 | static int process_buildids(void) |
424 | { | |
425 | u64 size = lseek(output, 0, SEEK_CUR); | |
426 | ||
9f591fd7 ACM |
427 | if (size == 0) |
428 | return 0; | |
429 | ||
6122e4e4 ACM |
430 | session->fd = output; |
431 | return __perf_session__process_events(session, post_processing_offset, | |
432 | size - post_processing_offset, | |
433 | size, &build_id__mark_dso_hit_ops); | |
434 | } | |
435 | ||
f5970550 PZ |
436 | static void atexit_header(void) |
437 | { | |
c7929e47 TZ |
438 | if (!pipe_output) { |
439 | session->header.data_size += bytes_written; | |
f5970550 | 440 | |
baa2f6ce ACM |
441 | if (!no_buildid) |
442 | process_buildids(); | |
c7929e47 | 443 | perf_header__write(&session->header, output, true); |
39d17dac | 444 | perf_session__delete(session); |
d65a458b | 445 | symbol__exit(); |
c7929e47 | 446 | } |
f5970550 PZ |
447 | } |
448 | ||
23346f21 | 449 | static void event__synthesize_guest_os(struct machine *machine, void *data) |
a1645ce1 ZY |
450 | { |
451 | int err; | |
23346f21 | 452 | struct perf_session *psession = data; |
a1645ce1 | 453 | |
23346f21 | 454 | if (machine__is_host(machine)) |
a1645ce1 ZY |
455 | return; |
456 | ||
457 | /* | |
458 | *As for guest kernel when processing subcommand record&report, | |
459 | *we arrange module mmap prior to guest kernel mmap and trigger | |
460 | *a preload dso because default guest module symbols are loaded | |
461 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This | |
462 | *method is used to avoid symbol missing when the first addr is | |
463 | *in module instead of in guest kernel. | |
464 | */ | |
465 | err = event__synthesize_modules(process_synthesized_event, | |
23346f21 | 466 | psession, machine); |
a1645ce1 ZY |
467 | if (err < 0) |
468 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 469 | " relocation symbol.\n", machine->pid); |
a1645ce1 | 470 | |
a1645ce1 ZY |
471 | /* |
472 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms | |
473 | * have no _text sometimes. | |
474 | */ | |
475 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 476 | psession, machine, "_text"); |
a1645ce1 ZY |
477 | if (err < 0) |
478 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 479 | psession, machine, "_stext"); |
a1645ce1 ZY |
480 | if (err < 0) |
481 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 482 | " relocation symbol.\n", machine->pid); |
a1645ce1 ZY |
483 | } |
484 | ||
98402807 FW |
485 | static struct perf_event_header finished_round_event = { |
486 | .size = sizeof(struct perf_event_header), | |
487 | .type = PERF_RECORD_FINISHED_ROUND, | |
488 | }; | |
489 | ||
490 | static void mmap_read_all(void) | |
491 | { | |
0e2e63dd | 492 | int i; |
98402807 FW |
493 | |
494 | for (i = 0; i < nr_cpu; i++) { | |
0e2e63dd PZ |
495 | if (mmap_array[i].base) |
496 | mmap_read(&mmap_array[i]); | |
98402807 FW |
497 | } |
498 | ||
499 | if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) | |
500 | write_output(&finished_round_event, sizeof(finished_round_event)); | |
501 | } | |
502 | ||
d4db3f16 | 503 | static int __cmd_record(int argc, const char **argv) |
16c8a109 PZ |
504 | { |
505 | int i, counter; | |
abaff32a | 506 | struct stat st; |
abaff32a | 507 | int flags; |
4dc0a04b | 508 | int err; |
8b412664 | 509 | unsigned long waking = 0; |
856e9660 | 510 | int child_ready_pipe[2], go_pipe[2]; |
46be604b | 511 | const bool forks = argc > 0; |
856e9660 | 512 | char buf; |
23346f21 | 513 | struct machine *machine; |
de9ac07b PZ |
514 | |
515 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b | 516 | |
f5970550 PZ |
517 | atexit(sig_atexit); |
518 | signal(SIGCHLD, sig_handler); | |
519 | signal(SIGINT, sig_handler); | |
520 | ||
d4db3f16 | 521 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
856e9660 PZ |
522 | perror("failed to create pipes"); |
523 | exit(-1); | |
524 | } | |
525 | ||
529870e3 TZ |
526 | if (!strcmp(output_name, "-")) |
527 | pipe_output = 1; | |
528 | else if (!stat(output_name, &st) && st.st_size) { | |
7865e817 | 529 | if (write_mode == WRITE_FORCE) { |
b38d3464 ACM |
530 | char oldname[PATH_MAX]; |
531 | snprintf(oldname, sizeof(oldname), "%s.old", | |
532 | output_name); | |
533 | unlink(oldname); | |
534 | rename(output_name, oldname); | |
266e0e21 | 535 | } |
7865e817 FW |
536 | } else if (write_mode == WRITE_APPEND) { |
537 | write_mode = WRITE_FORCE; | |
97124d5e PZ |
538 | } |
539 | ||
f887f301 | 540 | flags = O_CREAT|O_RDWR; |
7865e817 | 541 | if (write_mode == WRITE_APPEND) |
f5970550 | 542 | file_new = 0; |
abaff32a IM |
543 | else |
544 | flags |= O_TRUNC; | |
545 | ||
529870e3 TZ |
546 | if (pipe_output) |
547 | output = STDOUT_FILENO; | |
548 | else | |
549 | output = open(output_name, flags, S_IRUSR | S_IWUSR); | |
de9ac07b PZ |
550 | if (output < 0) { |
551 | perror("failed to create output file"); | |
552 | exit(-1); | |
553 | } | |
554 | ||
7865e817 | 555 | session = perf_session__new(output_name, O_WRONLY, |
454c407e | 556 | write_mode == WRITE_FORCE, false); |
94c744b6 | 557 | if (session == NULL) { |
a9a70bbc ACM |
558 | pr_err("Not enough memory for reading perf file header\n"); |
559 | return -1; | |
560 | } | |
561 | ||
baa2f6ce ACM |
562 | if (!no_buildid) |
563 | perf_header__set_feat(&session->header, HEADER_BUILD_ID); | |
564 | ||
4dc0a04b | 565 | if (!file_new) { |
8dc58101 | 566 | err = perf_header__read(session, output); |
4dc0a04b | 567 | if (err < 0) |
39d17dac | 568 | goto out_delete_session; |
4dc0a04b ACM |
569 | } |
570 | ||
db620b1c | 571 | if (have_tracepoints(attrs, nr_counters)) |
94c744b6 | 572 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
03456a15 | 573 | |
39d17dac ACM |
574 | /* |
575 | * perf_session__delete(session) will be called at atexit_header() | |
576 | */ | |
f5970550 PZ |
577 | atexit(atexit_header); |
578 | ||
d4db3f16 | 579 | if (forks) { |
46be604b | 580 | child_pid = fork(); |
2fb750e8 | 581 | if (child_pid < 0) { |
856e9660 PZ |
582 | perror("failed to fork"); |
583 | exit(-1); | |
584 | } | |
7c6a1c65 | 585 | |
46be604b | 586 | if (!child_pid) { |
529870e3 TZ |
587 | if (pipe_output) |
588 | dup2(2, 1); | |
856e9660 PZ |
589 | close(child_ready_pipe[0]); |
590 | close(go_pipe[1]); | |
591 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
592 | ||
593 | /* | |
594 | * Do a dummy execvp to get the PLT entry resolved, | |
595 | * so we avoid the resolver overhead on the real | |
596 | * execvp call. | |
597 | */ | |
598 | execvp("", (char **)argv); | |
599 | ||
600 | /* | |
601 | * Tell the parent we're ready to go | |
602 | */ | |
603 | close(child_ready_pipe[1]); | |
604 | ||
605 | /* | |
606 | * Wait until the parent tells us to go. | |
607 | */ | |
608 | if (read(go_pipe[0], &buf, 1) == -1) | |
609 | perror("unable to read pipe"); | |
610 | ||
611 | execvp(argv[0], (char **)argv); | |
612 | ||
613 | perror(argv[0]); | |
614 | exit(-1); | |
0a5ac846 | 615 | } |
856e9660 | 616 | |
d6d901c2 ZY |
617 | if (!system_wide && target_tid == -1 && target_pid == -1) |
618 | all_tids[0] = child_pid; | |
619 | ||
856e9660 PZ |
620 | close(child_ready_pipe[1]); |
621 | close(go_pipe[0]); | |
622 | /* | |
623 | * wait for child to settle | |
624 | */ | |
625 | if (read(child_ready_pipe[0], &buf, 1) == -1) { | |
626 | perror("unable to read pipe"); | |
627 | exit(-1); | |
628 | } | |
629 | close(child_ready_pipe[0]); | |
630 | } | |
631 | ||
c45c6ea2 SE |
632 | nr_cpus = read_cpu_map(cpu_list); |
633 | if (nr_cpus < 1) { | |
0ab7368f | 634 | perror("failed to collect number of CPUs"); |
c45c6ea2 SE |
635 | return -1; |
636 | } | |
637 | ||
638 | if (!system_wide && no_inherit && !cpu_list) { | |
639 | open_counters(-1); | |
856e9660 PZ |
640 | } else { |
641 | for (i = 0; i < nr_cpus; i++) | |
d6d901c2 | 642 | open_counters(cpumap[i]); |
0a5ac846 | 643 | } |
de9ac07b | 644 | |
529870e3 TZ |
645 | if (pipe_output) { |
646 | err = perf_header__write_pipe(output); | |
647 | if (err < 0) | |
648 | return err; | |
649 | } else if (file_new) { | |
94c744b6 | 650 | err = perf_header__write(&session->header, output, false); |
d5eed904 ACM |
651 | if (err < 0) |
652 | return err; | |
56b03f3c ACM |
653 | } |
654 | ||
6122e4e4 ACM |
655 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
656 | ||
2c46dbb5 TZ |
657 | if (pipe_output) { |
658 | err = event__synthesize_attrs(&session->header, | |
659 | process_synthesized_event, | |
660 | session); | |
661 | if (err < 0) { | |
662 | pr_err("Couldn't synthesize attrs.\n"); | |
663 | return err; | |
664 | } | |
cd19a035 TZ |
665 | |
666 | err = event__synthesize_event_types(process_synthesized_event, | |
667 | session); | |
668 | if (err < 0) { | |
669 | pr_err("Couldn't synthesize event_types.\n"); | |
670 | return err; | |
671 | } | |
9215545e | 672 | |
63e0c771 TZ |
673 | if (have_tracepoints(attrs, nr_counters)) { |
674 | /* | |
675 | * FIXME err <= 0 here actually means that | |
676 | * there were no tracepoints so its not really | |
677 | * an error, just that we don't need to | |
678 | * synthesize anything. We really have to | |
679 | * return this more properly and also | |
680 | * propagate errors that now are calling die() | |
681 | */ | |
682 | err = event__synthesize_tracing_data(output, attrs, | |
683 | nr_counters, | |
684 | process_synthesized_event, | |
685 | session); | |
686 | if (err <= 0) { | |
687 | pr_err("Couldn't record tracing data.\n"); | |
688 | return err; | |
689 | } | |
2c9faa06 | 690 | advance_output(err); |
63e0c771 | 691 | } |
2c46dbb5 TZ |
692 | } |
693 | ||
23346f21 ACM |
694 | machine = perf_session__find_host_machine(session); |
695 | if (!machine) { | |
a1645ce1 ZY |
696 | pr_err("Couldn't find native kernel information.\n"); |
697 | return -1; | |
698 | } | |
699 | ||
56b03f3c | 700 | err = event__synthesize_kernel_mmap(process_synthesized_event, |
23346f21 | 701 | session, machine, "_text"); |
70162138 ACM |
702 | if (err < 0) |
703 | err = event__synthesize_kernel_mmap(process_synthesized_event, | |
23346f21 | 704 | session, machine, "_stext"); |
c1a3a4b9 ACM |
705 | if (err < 0) |
706 | pr_err("Couldn't record kernel reference relocation symbol\n" | |
707 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
708 | "Check /proc/kallsyms permission or run as root.\n"); | |
b7cece76 | 709 | |
a1645ce1 | 710 | err = event__synthesize_modules(process_synthesized_event, |
23346f21 | 711 | session, machine); |
c1a3a4b9 ACM |
712 | if (err < 0) |
713 | pr_err("Couldn't record kernel module information.\n" | |
714 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
715 | "Check /proc/modules permission or run as root.\n"); | |
716 | ||
a1645ce1 | 717 | if (perf_guest) |
23346f21 | 718 | perf_session__process_machines(session, event__synthesize_guest_os); |
7c6a1c65 | 719 | |
cf103a14 | 720 | if (!system_wide) |
d6d901c2 | 721 | event__synthesize_thread(target_tid, process_synthesized_event, |
d8f66248 | 722 | session); |
234fbbf5 | 723 | else |
d8f66248 | 724 | event__synthesize_threads(process_synthesized_event, session); |
7c6a1c65 | 725 | |
de9ac07b PZ |
726 | if (realtime_prio) { |
727 | struct sched_param param; | |
728 | ||
729 | param.sched_priority = realtime_prio; | |
730 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 731 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
732 | exit(-1); |
733 | } | |
734 | } | |
735 | ||
856e9660 PZ |
736 | /* |
737 | * Let the child rip | |
738 | */ | |
d4db3f16 ACM |
739 | if (forks) |
740 | close(go_pipe[1]); | |
856e9660 | 741 | |
649c48a9 | 742 | for (;;) { |
2debbc83 | 743 | int hits = samples; |
d6d901c2 | 744 | int thread; |
de9ac07b | 745 | |
98402807 | 746 | mmap_read_all(); |
de9ac07b | 747 | |
649c48a9 PZ |
748 | if (hits == samples) { |
749 | if (done) | |
750 | break; | |
4dc0a04b | 751 | err = poll(event_array, nr_poll, -1); |
8b412664 PZ |
752 | waking++; |
753 | } | |
754 | ||
755 | if (done) { | |
756 | for (i = 0; i < nr_cpu; i++) { | |
d6d901c2 ZY |
757 | for (counter = 0; |
758 | counter < nr_counters; | |
759 | counter++) { | |
760 | for (thread = 0; | |
761 | thread < thread_num; | |
762 | thread++) | |
763 | ioctl(fd[i][counter][thread], | |
764 | PERF_EVENT_IOC_DISABLE); | |
765 | } | |
8b412664 | 766 | } |
649c48a9 | 767 | } |
de9ac07b PZ |
768 | } |
769 | ||
b44308f5 ACM |
770 | if (quiet) |
771 | return 0; | |
772 | ||
8b412664 PZ |
773 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
774 | ||
021e9f47 IM |
775 | /* |
776 | * Approximate RIP event size: 24 bytes. | |
777 | */ | |
778 | fprintf(stderr, | |
2debbc83 | 779 | "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", |
021e9f47 IM |
780 | (double)bytes_written / 1024.0 / 1024.0, |
781 | output_name, | |
782 | bytes_written / 24); | |
addc2785 | 783 | |
de9ac07b | 784 | return 0; |
39d17dac ACM |
785 | |
786 | out_delete_session: | |
787 | perf_session__delete(session); | |
788 | return err; | |
de9ac07b | 789 | } |
0e9b20b8 | 790 | |
0e9b20b8 | 791 | static const char * const record_usage[] = { |
9e096753 MG |
792 | "perf record [<options>] [<command>]", |
793 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
794 | NULL |
795 | }; | |
796 | ||
7865e817 FW |
797 | static bool force, append_file; |
798 | ||
bca647aa | 799 | const struct option record_options[] = { |
0e9b20b8 | 800 | OPT_CALLBACK('e', "event", NULL, "event", |
86847b62 TG |
801 | "event selector. use 'perf list' to list available events", |
802 | parse_events), | |
c171b552 LZ |
803 | OPT_CALLBACK(0, "filter", NULL, "filter", |
804 | "event filter", parse_filter), | |
0e9b20b8 | 805 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
806 | "record events on existing process id"), |
807 | OPT_INTEGER('t', "tid", &target_tid, | |
808 | "record events on existing thread id"), | |
0e9b20b8 IM |
809 | OPT_INTEGER('r', "realtime", &realtime_prio, |
810 | "collect data with this RT SCHED_FIFO priority"), | |
daac07b2 FW |
811 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
812 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
813 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
814 | "system-wide collection from all CPUs"), | |
abaff32a IM |
815 | OPT_BOOLEAN('A', "append", &append_file, |
816 | "append to the output file to do incremental profiling"), | |
c45c6ea2 SE |
817 | OPT_STRING('C', "cpu", &cpu_list, "cpu", |
818 | "list of cpus to monitor"), | |
97124d5e | 819 | OPT_BOOLEAN('f', "force", &force, |
7865e817 | 820 | "overwrite existing data file (deprecated)"), |
3de29cab | 821 | OPT_U64('c', "count", &user_interval, "event period to sample"), |
abaff32a IM |
822 | OPT_STRING('o', "output", &output_name, "file", |
823 | "output file name"), | |
2e6cdf99 SE |
824 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
825 | "child tasks do not inherit counters"), | |
1967936d ACM |
826 | OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), |
827 | OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), | |
3efa1cc9 IM |
828 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
829 | "do call-graph (stack chain/backtrace) recording"), | |
c0555642 | 830 | OPT_INCR('v', "verbose", &verbose, |
3da297a6 | 831 | "be more verbose (show counter open errors, etc)"), |
b44308f5 | 832 | OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
649c48a9 PZ |
833 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
834 | "per thread counts"), | |
4bba828d AB |
835 | OPT_BOOLEAN('d', "data", &sample_address, |
836 | "Sample addresses"), | |
649c48a9 PZ |
837 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
838 | "don't sample"), | |
baa2f6ce | 839 | OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache, |
a1ac1d3c | 840 | "do not update the buildid cache"), |
baa2f6ce ACM |
841 | OPT_BOOLEAN('B', "no-buildid", &no_buildid, |
842 | "do not collect buildids in perf.data"), | |
0e9b20b8 IM |
843 | OPT_END() |
844 | }; | |
845 | ||
f37a291c | 846 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 | 847 | { |
39d17dac | 848 | int i, j, err = -ENOMEM; |
0e9b20b8 | 849 | |
bca647aa | 850 | argc = parse_options(argc, argv, record_options, record_usage, |
655000e7 | 851 | PARSE_OPT_STOP_AT_NON_OPTION); |
d6d901c2 | 852 | if (!argc && target_pid == -1 && target_tid == -1 && |
c45c6ea2 | 853 | !system_wide && !cpu_list) |
bca647aa | 854 | usage_with_options(record_usage, record_options); |
0e9b20b8 | 855 | |
7865e817 FW |
856 | if (force && append_file) { |
857 | fprintf(stderr, "Can't overwrite and append at the same time." | |
858 | " You need to choose between -f and -A"); | |
bca647aa | 859 | usage_with_options(record_usage, record_options); |
7865e817 FW |
860 | } else if (append_file) { |
861 | write_mode = WRITE_APPEND; | |
862 | } else { | |
863 | write_mode = WRITE_FORCE; | |
864 | } | |
865 | ||
655000e7 | 866 | symbol__init(); |
baa2f6ce ACM |
867 | |
868 | if (no_buildid_cache || no_buildid) | |
a1ac1d3c | 869 | disable_buildid_cache(); |
655000e7 | 870 | |
bbd36e5e PZ |
871 | if (!nr_counters) { |
872 | nr_counters = 1; | |
873 | attrs[0].type = PERF_TYPE_HARDWARE; | |
874 | attrs[0].config = PERF_COUNT_HW_CPU_CYCLES; | |
875 | } | |
0e9b20b8 | 876 | |
d6d901c2 ZY |
877 | if (target_pid != -1) { |
878 | target_tid = target_pid; | |
879 | thread_num = find_all_tid(target_pid, &all_tids); | |
880 | if (thread_num <= 0) { | |
881 | fprintf(stderr, "Can't find all threads of pid %d\n", | |
882 | target_pid); | |
bca647aa | 883 | usage_with_options(record_usage, record_options); |
d6d901c2 ZY |
884 | } |
885 | } else { | |
886 | all_tids=malloc(sizeof(pid_t)); | |
887 | if (!all_tids) | |
d65a458b | 888 | goto out_symbol_exit; |
d6d901c2 ZY |
889 | |
890 | all_tids[0] = target_tid; | |
891 | thread_num = 1; | |
892 | } | |
893 | ||
894 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
895 | for (j = 0; j < MAX_COUNTERS; j++) { | |
896 | fd[i][j] = malloc(sizeof(int)*thread_num); | |
0e2e63dd | 897 | if (!fd[i][j]) |
39d17dac | 898 | goto out_free_fd; |
d6d901c2 ZY |
899 | } |
900 | } | |
901 | event_array = malloc( | |
902 | sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num); | |
903 | if (!event_array) | |
39d17dac | 904 | goto out_free_fd; |
d6d901c2 | 905 | |
3de29cab | 906 | if (user_interval != ULLONG_MAX) |
f9212819 FW |
907 | default_interval = user_interval; |
908 | if (user_freq != UINT_MAX) | |
909 | freq = user_freq; | |
910 | ||
7e4ff9e3 MG |
911 | /* |
912 | * User specified count overrides default frequency. | |
913 | */ | |
914 | if (default_interval) | |
915 | freq = 0; | |
916 | else if (freq) { | |
917 | default_interval = freq; | |
918 | } else { | |
919 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
39d17dac ACM |
920 | err = -EINVAL; |
921 | goto out_free_event_array; | |
7e4ff9e3 MG |
922 | } |
923 | ||
39d17dac ACM |
924 | err = __cmd_record(argc, argv); |
925 | ||
926 | out_free_event_array: | |
927 | free(event_array); | |
928 | out_free_fd: | |
929 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
930 | for (j = 0; j < MAX_COUNTERS; j++) | |
931 | free(fd[i][j]); | |
932 | } | |
933 | free(all_tids); | |
934 | all_tids = NULL; | |
d65a458b ACM |
935 | out_symbol_exit: |
936 | symbol__exit(); | |
39d17dac | 937 | return err; |
0e9b20b8 | 938 | } |