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" |
361c99a6 | 21 | #include "util/evlist.h" |
69aad6f1 | 22 | #include "util/evsel.h" |
8f28827a | 23 | #include "util/debug.h" |
94c744b6 | 24 | #include "util/session.h" |
8d06367f | 25 | #include "util/symbol.h" |
a12b51c4 | 26 | #include "util/cpumap.h" |
fd78260b | 27 | #include "util/thread_map.h" |
7c6a1c65 | 28 | |
97124d5e | 29 | #include <unistd.h> |
de9ac07b | 30 | #include <sched.h> |
a41794cd | 31 | #include <sys/mman.h> |
de9ac07b | 32 | |
69aad6f1 | 33 | #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
0a27d7f9 | 34 | #define SID(e, x, y) xyarray__entry(e->id, x, y) |
69aad6f1 | 35 | |
7865e817 FW |
36 | enum write_mode_t { |
37 | WRITE_FORCE, | |
38 | WRITE_APPEND | |
39 | }; | |
40 | ||
3de29cab SE |
41 | static u64 user_interval = ULLONG_MAX; |
42 | static u64 default_interval = 0; | |
640c03ce | 43 | static u64 sample_type; |
a21ca2ca | 44 | |
de9ac07b | 45 | static unsigned int page_size; |
42e59d7d | 46 | static unsigned int mmap_pages = 128; |
f9212819 | 47 | static unsigned int user_freq = UINT_MAX; |
42e59d7d | 48 | static int freq = 1000; |
de9ac07b | 49 | static int output; |
529870e3 | 50 | static int pipe_output = 0; |
d7065adb | 51 | static const char *output_name = NULL; |
42e59d7d | 52 | static int group = 0; |
1967936d | 53 | static int realtime_prio = 0; |
acac03fa | 54 | static bool nodelay = false; |
c0555642 | 55 | static bool raw_samples = false; |
9c90a61c | 56 | static bool sample_id_all_avail = true; |
c0555642 | 57 | static bool system_wide = false; |
42e59d7d | 58 | static pid_t target_pid = -1; |
d6d901c2 | 59 | static pid_t target_tid = -1; |
42e59d7d | 60 | static pid_t child_pid = -1; |
2e6cdf99 | 61 | static bool no_inherit = false; |
7865e817 | 62 | static enum write_mode_t write_mode = WRITE_FORCE; |
c0555642 IM |
63 | static bool call_graph = false; |
64 | static bool inherit_stat = false; | |
65 | static bool no_samples = false; | |
66 | static bool sample_address = false; | |
9c90a61c | 67 | static bool sample_time = false; |
a1ac1d3c | 68 | static bool no_buildid = false; |
baa2f6ce | 69 | static bool no_buildid_cache = false; |
361c99a6 | 70 | static struct perf_evlist *evsel_list; |
42e59d7d IM |
71 | |
72 | static long samples = 0; | |
42e59d7d | 73 | static u64 bytes_written = 0; |
a21ca2ca | 74 | |
42e59d7d | 75 | static int file_new = 1; |
6122e4e4 | 76 | static off_t post_processing_offset; |
7c6a1c65 | 77 | |
94c744b6 | 78 | static struct perf_session *session; |
c45c6ea2 | 79 | static const char *cpu_list; |
f5970550 | 80 | |
9215545e TZ |
81 | static void advance_output(size_t size) |
82 | { | |
83 | bytes_written += size; | |
84 | } | |
85 | ||
f5970550 PZ |
86 | static void write_output(void *buf, size_t size) |
87 | { | |
88 | while (size) { | |
89 | int ret = write(output, buf, size); | |
90 | ||
91 | if (ret < 0) | |
92 | die("failed to write"); | |
93 | ||
94 | size -= ret; | |
95 | buf += ret; | |
96 | ||
97 | bytes_written += ret; | |
98 | } | |
99 | } | |
100 | ||
8115d60c | 101 | static int process_synthesized_event(union perf_event *event, |
8d50e5b4 | 102 | struct perf_sample *sample __used, |
d8f66248 | 103 | struct perf_session *self __used) |
234fbbf5 | 104 | { |
6122e4e4 | 105 | write_output(event, event->header.size); |
234fbbf5 ACM |
106 | return 0; |
107 | } | |
108 | ||
744bd8aa | 109 | static void mmap_read(struct perf_mmap *md) |
de9ac07b | 110 | { |
744bd8aa | 111 | unsigned int head = perf_mmap__read_head(md); |
de9ac07b PZ |
112 | unsigned int old = md->prev; |
113 | unsigned char *data = md->base + page_size; | |
114 | unsigned long size; | |
115 | void *buf; | |
de9ac07b | 116 | |
dc82009a ACM |
117 | if (old == head) |
118 | return; | |
119 | ||
120 | samples++; | |
de9ac07b PZ |
121 | |
122 | size = head - old; | |
123 | ||
124 | if ((old & md->mask) + size != (head & md->mask)) { | |
125 | buf = &data[old & md->mask]; | |
126 | size = md->mask + 1 - (old & md->mask); | |
127 | old += size; | |
021e9f47 | 128 | |
6122e4e4 | 129 | write_output(buf, size); |
de9ac07b PZ |
130 | } |
131 | ||
132 | buf = &data[old & md->mask]; | |
133 | size = head - old; | |
134 | old += size; | |
021e9f47 | 135 | |
6122e4e4 | 136 | write_output(buf, size); |
de9ac07b PZ |
137 | |
138 | md->prev = old; | |
115d2d89 | 139 | perf_mmap__write_tail(md, old); |
de9ac07b PZ |
140 | } |
141 | ||
142 | static volatile int done = 0; | |
f7b7c26e | 143 | static volatile int signr = -1; |
de9ac07b | 144 | |
16c8a109 | 145 | static void sig_handler(int sig) |
de9ac07b | 146 | { |
16c8a109 | 147 | done = 1; |
f7b7c26e PZ |
148 | signr = sig; |
149 | } | |
150 | ||
151 | static void sig_atexit(void) | |
152 | { | |
5ffc8881 | 153 | if (child_pid > 0) |
933da83a CW |
154 | kill(child_pid, SIGTERM); |
155 | ||
18483b81 | 156 | if (signr == -1 || signr == SIGUSR1) |
f7b7c26e PZ |
157 | return; |
158 | ||
159 | signal(signr, SIG_DFL); | |
160 | kill(getpid(), signr); | |
de9ac07b PZ |
161 | } |
162 | ||
cdd6c482 | 163 | static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) |
7c6a1c65 PZ |
164 | { |
165 | struct perf_header_attr *h_attr; | |
166 | ||
94c744b6 ACM |
167 | if (nr < session->header.attrs) { |
168 | h_attr = session->header.attr[nr]; | |
7c6a1c65 PZ |
169 | } else { |
170 | h_attr = perf_header_attr__new(a); | |
dc79c0fc | 171 | if (h_attr != NULL) |
94c744b6 | 172 | if (perf_header__add_attr(&session->header, h_attr) < 0) { |
11deb1f9 ACM |
173 | perf_header_attr__delete(h_attr); |
174 | h_attr = NULL; | |
175 | } | |
7c6a1c65 PZ |
176 | } |
177 | ||
178 | return h_attr; | |
179 | } | |
180 | ||
0a27d7f9 | 181 | static void create_counter(struct perf_evsel *evsel, int cpu) |
de9ac07b | 182 | { |
69aad6f1 ACM |
183 | char *filter = evsel->filter; |
184 | struct perf_event_attr *attr = &evsel->attr; | |
7c6a1c65 | 185 | struct perf_header_attr *h_attr; |
0a27d7f9 | 186 | struct perf_sample_id *sid; |
d6d901c2 | 187 | int thread_index; |
c171b552 | 188 | int ret; |
dd7927f4 | 189 | |
7e2ed097 | 190 | for (thread_index = 0; thread_index < evsel_list->threads->nr; thread_index++) { |
dd7927f4 ACM |
191 | h_attr = get_header_attr(attr, evsel->idx); |
192 | if (h_attr == NULL) | |
193 | die("nomem\n"); | |
194 | ||
195 | if (!file_new) { | |
196 | if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { | |
197 | fprintf(stderr, "incompatible append\n"); | |
198 | exit(-1); | |
199 | } | |
200 | } | |
201 | ||
0a27d7f9 ACM |
202 | sid = SID(evsel, cpu, thread_index); |
203 | if (perf_header_attr__add_id(h_attr, sid->id) < 0) { | |
dd7927f4 ACM |
204 | pr_warning("Not enough memory to add id\n"); |
205 | exit(-1); | |
206 | } | |
207 | ||
dd7927f4 ACM |
208 | if (filter != NULL) { |
209 | ret = ioctl(FD(evsel, cpu, thread_index), | |
210 | PERF_EVENT_IOC_SET_FILTER, filter); | |
211 | if (ret) { | |
212 | error("failed to set filter with %d (%s)\n", errno, | |
213 | strerror(errno)); | |
214 | exit(-1); | |
215 | } | |
216 | } | |
217 | } | |
218 | ||
219 | if (!sample_type) | |
220 | sample_type = attr->sample_type; | |
221 | } | |
222 | ||
223 | static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist) | |
224 | { | |
225 | struct perf_event_attr *attr = &evsel->attr; | |
226 | int track = !evsel->idx; /* only the first counter needs these */ | |
7c6a1c65 PZ |
227 | |
228 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
229 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
230 | PERF_FORMAT_ID; | |
16c8a109 | 231 | |
3a9f131f | 232 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 233 | |
361c99a6 | 234 | if (evlist->nr_entries > 1) |
8907fd60 EM |
235 | attr->sample_type |= PERF_SAMPLE_ID; |
236 | ||
f9212819 FW |
237 | /* |
238 | * We default some events to a 1 default interval. But keep | |
239 | * it a weak assumption overridable by the user. | |
240 | */ | |
241 | if (!attr->sample_period || (user_freq != UINT_MAX && | |
3de29cab | 242 | user_interval != ULLONG_MAX)) { |
f9212819 FW |
243 | if (freq) { |
244 | attr->sample_type |= PERF_SAMPLE_PERIOD; | |
245 | attr->freq = 1; | |
246 | attr->sample_freq = freq; | |
247 | } else { | |
248 | attr->sample_period = default_interval; | |
249 | } | |
1dba15e7 | 250 | } |
3efa1cc9 | 251 | |
649c48a9 PZ |
252 | if (no_samples) |
253 | attr->sample_freq = 0; | |
254 | ||
255 | if (inherit_stat) | |
256 | attr->inherit_stat = 1; | |
257 | ||
3af9e859 | 258 | if (sample_address) { |
4bba828d | 259 | attr->sample_type |= PERF_SAMPLE_ADDR; |
3af9e859 EM |
260 | attr->mmap_data = track; |
261 | } | |
4bba828d | 262 | |
3efa1cc9 IM |
263 | if (call_graph) |
264 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
265 | ||
f60f3593 AS |
266 | if (system_wide) |
267 | attr->sample_type |= PERF_SAMPLE_CPU; | |
268 | ||
a43d3f08 ACM |
269 | if (sample_id_all_avail && |
270 | (sample_time || system_wide || !no_inherit || cpu_list)) | |
9c90a61c ACM |
271 | attr->sample_type |= PERF_SAMPLE_TIME; |
272 | ||
cd6feeea | 273 | if (raw_samples) { |
6ddf259d | 274 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 275 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
276 | attr->sample_type |= PERF_SAMPLE_CPU; |
277 | } | |
f413cdb8 | 278 | |
acac03fa KS |
279 | if (nodelay) { |
280 | attr->watermark = 0; | |
281 | attr->wakeup_events = 1; | |
282 | } | |
283 | ||
a21ca2ca IM |
284 | attr->mmap = track; |
285 | attr->comm = track; | |
dd7927f4 | 286 | |
2e6cdf99 | 287 | if (target_pid == -1 && target_tid == -1 && !system_wide) { |
46be604b | 288 | attr->disabled = 1; |
bedbfdea | 289 | attr->enable_on_exec = 1; |
46be604b | 290 | } |
dd7927f4 | 291 | } |
bedbfdea | 292 | |
dd7927f4 ACM |
293 | static void open_counters(struct perf_evlist *evlist) |
294 | { | |
295 | struct perf_evsel *pos; | |
296 | int cpu; | |
297 | ||
298 | list_for_each_entry(pos, &evlist->entries, node) { | |
299 | struct perf_event_attr *attr = &pos->attr; | |
300 | /* | |
301 | * Check if parse_single_tracepoint_event has already asked for | |
302 | * PERF_SAMPLE_TIME. | |
303 | * | |
304 | * XXX this is kludgy but short term fix for problems introduced by | |
305 | * eac23d1c that broke 'perf script' by having different sample_types | |
306 | * when using multiple tracepoint events when we use a perf binary | |
307 | * that tries to use sample_id_all on an older kernel. | |
308 | * | |
309 | * We need to move counter creation to perf_session, support | |
310 | * different sample_types, etc. | |
311 | */ | |
312 | bool time_needed = attr->sample_type & PERF_SAMPLE_TIME; | |
d6d901c2 | 313 | |
dd7927f4 ACM |
314 | config_attr(pos, evlist); |
315 | retry_sample_id: | |
316 | attr->sample_id_all = sample_id_all_avail ? 1 : 0; | |
317 | try_again: | |
7e2ed097 ACM |
318 | if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group, |
319 | !no_inherit) < 0) { | |
d6d901c2 ZY |
320 | int err = errno; |
321 | ||
322 | if (err == EPERM || err == EACCES) | |
323 | die("Permission error - are you root?\n" | |
324 | "\t Consider tweaking" | |
325 | " /proc/sys/kernel/perf_event_paranoid.\n"); | |
c45c6ea2 | 326 | else if (err == ENODEV && cpu_list) { |
d6d901c2 ZY |
327 | die("No such device - did you specify" |
328 | " an out-of-range profile CPU?\n"); | |
9c90a61c ACM |
329 | } else if (err == EINVAL && sample_id_all_avail) { |
330 | /* | |
331 | * Old kernel, no attr->sample_id_type_all field | |
332 | */ | |
333 | sample_id_all_avail = false; | |
a43d3f08 | 334 | if (!sample_time && !raw_samples && !time_needed) |
eac23d1c IM |
335 | attr->sample_type &= ~PERF_SAMPLE_TIME; |
336 | ||
9c90a61c | 337 | goto retry_sample_id; |
d6d901c2 | 338 | } |
3da297a6 | 339 | |
d6d901c2 ZY |
340 | /* |
341 | * If it's cycles then fall back to hrtimer | |
342 | * based cpu-clock-tick sw counter, which | |
343 | * is always available even if no PMU support: | |
344 | */ | |
345 | if (attr->type == PERF_TYPE_HARDWARE | |
346 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { | |
347 | ||
348 | if (verbose) | |
349 | warning(" ... trying to fall back to cpu-clock-ticks\n"); | |
350 | attr->type = PERF_TYPE_SOFTWARE; | |
351 | attr->config = PERF_COUNT_SW_CPU_CLOCK; | |
352 | goto try_again; | |
353 | } | |
354 | printf("\n"); | |
d9cf837e | 355 | error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", |
dd7927f4 | 356 | err, strerror(err)); |
bfd45118 SK |
357 | |
358 | #if defined(__i386__) || defined(__x86_64__) | |
d6d901c2 ZY |
359 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
360 | die("No hardware sampling interrupt available." | |
361 | " No APIC? If so then you can boot the kernel" | |
362 | " with the \"lapic\" boot parameter to" | |
363 | " force-enable it.\n"); | |
bfd45118 SK |
364 | #endif |
365 | ||
d6d901c2 | 366 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
c171b552 LZ |
367 | } |
368 | } | |
a43d3f08 | 369 | |
7e2ed097 | 370 | if (perf_evlist__mmap(evlist, mmap_pages, false) < 0) |
0a27d7f9 ACM |
371 | die("failed to mmap with %d (%s)\n", errno, strerror(errno)); |
372 | ||
7e2ed097 | 373 | for (cpu = 0; cpu < evsel_list->cpus->nr; ++cpu) { |
dd7927f4 | 374 | list_for_each_entry(pos, &evlist->entries, node) |
0a27d7f9 | 375 | create_counter(pos, cpu); |
dd7927f4 | 376 | } |
16c8a109 PZ |
377 | } |
378 | ||
6122e4e4 ACM |
379 | static int process_buildids(void) |
380 | { | |
381 | u64 size = lseek(output, 0, SEEK_CUR); | |
382 | ||
9f591fd7 ACM |
383 | if (size == 0) |
384 | return 0; | |
385 | ||
6122e4e4 ACM |
386 | session->fd = output; |
387 | return __perf_session__process_events(session, post_processing_offset, | |
388 | size - post_processing_offset, | |
389 | size, &build_id__mark_dso_hit_ops); | |
390 | } | |
391 | ||
f5970550 PZ |
392 | static void atexit_header(void) |
393 | { | |
c7929e47 TZ |
394 | if (!pipe_output) { |
395 | session->header.data_size += bytes_written; | |
f5970550 | 396 | |
baa2f6ce ACM |
397 | if (!no_buildid) |
398 | process_buildids(); | |
361c99a6 | 399 | perf_header__write(&session->header, evsel_list, output, true); |
39d17dac | 400 | perf_session__delete(session); |
361c99a6 | 401 | perf_evlist__delete(evsel_list); |
d65a458b | 402 | symbol__exit(); |
c7929e47 | 403 | } |
f5970550 PZ |
404 | } |
405 | ||
8115d60c | 406 | static void perf_event__synthesize_guest_os(struct machine *machine, void *data) |
a1645ce1 ZY |
407 | { |
408 | int err; | |
23346f21 | 409 | struct perf_session *psession = data; |
a1645ce1 | 410 | |
23346f21 | 411 | if (machine__is_host(machine)) |
a1645ce1 ZY |
412 | return; |
413 | ||
414 | /* | |
415 | *As for guest kernel when processing subcommand record&report, | |
416 | *we arrange module mmap prior to guest kernel mmap and trigger | |
417 | *a preload dso because default guest module symbols are loaded | |
418 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This | |
419 | *method is used to avoid symbol missing when the first addr is | |
420 | *in module instead of in guest kernel. | |
421 | */ | |
8115d60c ACM |
422 | err = perf_event__synthesize_modules(process_synthesized_event, |
423 | psession, machine); | |
a1645ce1 ZY |
424 | if (err < 0) |
425 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 426 | " relocation symbol.\n", machine->pid); |
a1645ce1 | 427 | |
a1645ce1 ZY |
428 | /* |
429 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms | |
430 | * have no _text sometimes. | |
431 | */ | |
8115d60c ACM |
432 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
433 | psession, machine, "_text"); | |
a1645ce1 | 434 | if (err < 0) |
8115d60c ACM |
435 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
436 | psession, machine, | |
437 | "_stext"); | |
a1645ce1 ZY |
438 | if (err < 0) |
439 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 440 | " relocation symbol.\n", machine->pid); |
a1645ce1 ZY |
441 | } |
442 | ||
98402807 FW |
443 | static struct perf_event_header finished_round_event = { |
444 | .size = sizeof(struct perf_event_header), | |
445 | .type = PERF_RECORD_FINISHED_ROUND, | |
446 | }; | |
447 | ||
448 | static void mmap_read_all(void) | |
449 | { | |
0e2e63dd | 450 | int i; |
98402807 | 451 | |
7e2ed097 | 452 | for (i = 0; i < evsel_list->cpus->nr; i++) { |
0a27d7f9 ACM |
453 | if (evsel_list->mmap[i].base) |
454 | mmap_read(&evsel_list->mmap[i]); | |
98402807 FW |
455 | } |
456 | ||
457 | if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) | |
458 | write_output(&finished_round_event, sizeof(finished_round_event)); | |
459 | } | |
460 | ||
d4db3f16 | 461 | static int __cmd_record(int argc, const char **argv) |
16c8a109 | 462 | { |
69aad6f1 | 463 | int i; |
abaff32a | 464 | struct stat st; |
abaff32a | 465 | int flags; |
4dc0a04b | 466 | int err; |
8b412664 | 467 | unsigned long waking = 0; |
856e9660 | 468 | int child_ready_pipe[2], go_pipe[2]; |
46be604b | 469 | const bool forks = argc > 0; |
856e9660 | 470 | char buf; |
23346f21 | 471 | struct machine *machine; |
de9ac07b PZ |
472 | |
473 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b | 474 | |
f5970550 PZ |
475 | atexit(sig_atexit); |
476 | signal(SIGCHLD, sig_handler); | |
477 | signal(SIGINT, sig_handler); | |
18483b81 | 478 | signal(SIGUSR1, sig_handler); |
f5970550 | 479 | |
d4db3f16 | 480 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
856e9660 PZ |
481 | perror("failed to create pipes"); |
482 | exit(-1); | |
483 | } | |
484 | ||
d7065adb FBH |
485 | if (!output_name) { |
486 | if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode)) | |
487 | pipe_output = 1; | |
488 | else | |
489 | output_name = "perf.data"; | |
490 | } | |
491 | if (output_name) { | |
492 | if (!strcmp(output_name, "-")) | |
493 | pipe_output = 1; | |
494 | else if (!stat(output_name, &st) && st.st_size) { | |
495 | if (write_mode == WRITE_FORCE) { | |
496 | char oldname[PATH_MAX]; | |
497 | snprintf(oldname, sizeof(oldname), "%s.old", | |
498 | output_name); | |
499 | unlink(oldname); | |
500 | rename(output_name, oldname); | |
501 | } | |
502 | } else if (write_mode == WRITE_APPEND) { | |
503 | write_mode = WRITE_FORCE; | |
266e0e21 | 504 | } |
97124d5e PZ |
505 | } |
506 | ||
f887f301 | 507 | flags = O_CREAT|O_RDWR; |
7865e817 | 508 | if (write_mode == WRITE_APPEND) |
f5970550 | 509 | file_new = 0; |
abaff32a IM |
510 | else |
511 | flags |= O_TRUNC; | |
512 | ||
529870e3 TZ |
513 | if (pipe_output) |
514 | output = STDOUT_FILENO; | |
515 | else | |
516 | output = open(output_name, flags, S_IRUSR | S_IWUSR); | |
de9ac07b PZ |
517 | if (output < 0) { |
518 | perror("failed to create output file"); | |
519 | exit(-1); | |
520 | } | |
521 | ||
7865e817 | 522 | session = perf_session__new(output_name, O_WRONLY, |
21ef97f0 | 523 | write_mode == WRITE_FORCE, false, NULL); |
94c744b6 | 524 | if (session == NULL) { |
a9a70bbc ACM |
525 | pr_err("Not enough memory for reading perf file header\n"); |
526 | return -1; | |
527 | } | |
528 | ||
baa2f6ce ACM |
529 | if (!no_buildid) |
530 | perf_header__set_feat(&session->header, HEADER_BUILD_ID); | |
531 | ||
4dc0a04b | 532 | if (!file_new) { |
8dc58101 | 533 | err = perf_header__read(session, output); |
4dc0a04b | 534 | if (err < 0) |
39d17dac | 535 | goto out_delete_session; |
4dc0a04b ACM |
536 | } |
537 | ||
361c99a6 | 538 | if (have_tracepoints(&evsel_list->entries)) |
94c744b6 | 539 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
03456a15 | 540 | |
39d17dac ACM |
541 | /* |
542 | * perf_session__delete(session) will be called at atexit_header() | |
543 | */ | |
f5970550 PZ |
544 | atexit(atexit_header); |
545 | ||
d4db3f16 | 546 | if (forks) { |
46be604b | 547 | child_pid = fork(); |
2fb750e8 | 548 | if (child_pid < 0) { |
856e9660 PZ |
549 | perror("failed to fork"); |
550 | exit(-1); | |
551 | } | |
7c6a1c65 | 552 | |
46be604b | 553 | if (!child_pid) { |
529870e3 TZ |
554 | if (pipe_output) |
555 | dup2(2, 1); | |
856e9660 PZ |
556 | close(child_ready_pipe[0]); |
557 | close(go_pipe[1]); | |
558 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
559 | ||
560 | /* | |
561 | * Do a dummy execvp to get the PLT entry resolved, | |
562 | * so we avoid the resolver overhead on the real | |
563 | * execvp call. | |
564 | */ | |
565 | execvp("", (char **)argv); | |
566 | ||
567 | /* | |
568 | * Tell the parent we're ready to go | |
569 | */ | |
570 | close(child_ready_pipe[1]); | |
571 | ||
572 | /* | |
573 | * Wait until the parent tells us to go. | |
574 | */ | |
575 | if (read(go_pipe[0], &buf, 1) == -1) | |
576 | perror("unable to read pipe"); | |
577 | ||
578 | execvp(argv[0], (char **)argv); | |
579 | ||
580 | perror(argv[0]); | |
18483b81 | 581 | kill(getppid(), SIGUSR1); |
856e9660 | 582 | exit(-1); |
0a5ac846 | 583 | } |
856e9660 | 584 | |
d6d901c2 | 585 | if (!system_wide && target_tid == -1 && target_pid == -1) |
7e2ed097 | 586 | evsel_list->threads->map[0] = child_pid; |
d6d901c2 | 587 | |
856e9660 PZ |
588 | close(child_ready_pipe[1]); |
589 | close(go_pipe[0]); | |
590 | /* | |
591 | * wait for child to settle | |
592 | */ | |
593 | if (read(child_ready_pipe[0], &buf, 1) == -1) { | |
594 | perror("unable to read pipe"); | |
595 | exit(-1); | |
596 | } | |
597 | close(child_ready_pipe[0]); | |
598 | } | |
599 | ||
dd7927f4 | 600 | open_counters(evsel_list); |
de9ac07b | 601 | |
640c03ce ACM |
602 | perf_session__set_sample_type(session, sample_type); |
603 | ||
529870e3 TZ |
604 | if (pipe_output) { |
605 | err = perf_header__write_pipe(output); | |
606 | if (err < 0) | |
607 | return err; | |
608 | } else if (file_new) { | |
361c99a6 ACM |
609 | err = perf_header__write(&session->header, evsel_list, |
610 | output, false); | |
d5eed904 ACM |
611 | if (err < 0) |
612 | return err; | |
56b03f3c ACM |
613 | } |
614 | ||
6122e4e4 ACM |
615 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
616 | ||
9c90a61c ACM |
617 | perf_session__set_sample_id_all(session, sample_id_all_avail); |
618 | ||
2c46dbb5 | 619 | if (pipe_output) { |
8115d60c ACM |
620 | err = perf_event__synthesize_attrs(&session->header, |
621 | process_synthesized_event, | |
622 | session); | |
2c46dbb5 TZ |
623 | if (err < 0) { |
624 | pr_err("Couldn't synthesize attrs.\n"); | |
625 | return err; | |
626 | } | |
cd19a035 | 627 | |
8115d60c ACM |
628 | err = perf_event__synthesize_event_types(process_synthesized_event, |
629 | session); | |
cd19a035 TZ |
630 | if (err < 0) { |
631 | pr_err("Couldn't synthesize event_types.\n"); | |
632 | return err; | |
633 | } | |
9215545e | 634 | |
361c99a6 | 635 | if (have_tracepoints(&evsel_list->entries)) { |
63e0c771 TZ |
636 | /* |
637 | * FIXME err <= 0 here actually means that | |
638 | * there were no tracepoints so its not really | |
639 | * an error, just that we don't need to | |
640 | * synthesize anything. We really have to | |
641 | * return this more properly and also | |
642 | * propagate errors that now are calling die() | |
643 | */ | |
8115d60c ACM |
644 | err = perf_event__synthesize_tracing_data(output, evsel_list, |
645 | process_synthesized_event, | |
646 | session); | |
63e0c771 TZ |
647 | if (err <= 0) { |
648 | pr_err("Couldn't record tracing data.\n"); | |
649 | return err; | |
650 | } | |
2c9faa06 | 651 | advance_output(err); |
63e0c771 | 652 | } |
2c46dbb5 TZ |
653 | } |
654 | ||
23346f21 ACM |
655 | machine = perf_session__find_host_machine(session); |
656 | if (!machine) { | |
a1645ce1 ZY |
657 | pr_err("Couldn't find native kernel information.\n"); |
658 | return -1; | |
659 | } | |
660 | ||
8115d60c ACM |
661 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
662 | session, machine, "_text"); | |
70162138 | 663 | if (err < 0) |
8115d60c ACM |
664 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
665 | session, machine, "_stext"); | |
c1a3a4b9 ACM |
666 | if (err < 0) |
667 | pr_err("Couldn't record kernel reference relocation symbol\n" | |
668 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
669 | "Check /proc/kallsyms permission or run as root.\n"); | |
b7cece76 | 670 | |
8115d60c ACM |
671 | err = perf_event__synthesize_modules(process_synthesized_event, |
672 | session, machine); | |
c1a3a4b9 ACM |
673 | if (err < 0) |
674 | pr_err("Couldn't record kernel module information.\n" | |
675 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
676 | "Check /proc/modules permission or run as root.\n"); | |
677 | ||
a1645ce1 | 678 | if (perf_guest) |
8115d60c ACM |
679 | perf_session__process_machines(session, |
680 | perf_event__synthesize_guest_os); | |
7c6a1c65 | 681 | |
cf103a14 | 682 | if (!system_wide) |
7c940c18 ACM |
683 | perf_event__synthesize_thread_map(evsel_list->threads, |
684 | process_synthesized_event, | |
685 | session); | |
234fbbf5 | 686 | else |
8115d60c ACM |
687 | perf_event__synthesize_threads(process_synthesized_event, |
688 | session); | |
7c6a1c65 | 689 | |
de9ac07b PZ |
690 | if (realtime_prio) { |
691 | struct sched_param param; | |
692 | ||
693 | param.sched_priority = realtime_prio; | |
694 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 695 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
696 | exit(-1); |
697 | } | |
698 | } | |
699 | ||
856e9660 PZ |
700 | /* |
701 | * Let the child rip | |
702 | */ | |
d4db3f16 ACM |
703 | if (forks) |
704 | close(go_pipe[1]); | |
856e9660 | 705 | |
649c48a9 | 706 | for (;;) { |
2debbc83 | 707 | int hits = samples; |
d6d901c2 | 708 | int thread; |
de9ac07b | 709 | |
98402807 | 710 | mmap_read_all(); |
de9ac07b | 711 | |
649c48a9 PZ |
712 | if (hits == samples) { |
713 | if (done) | |
714 | break; | |
5c581041 | 715 | err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1); |
8b412664 PZ |
716 | waking++; |
717 | } | |
718 | ||
719 | if (done) { | |
7e2ed097 | 720 | for (i = 0; i < evsel_list->cpus->nr; i++) { |
69aad6f1 ACM |
721 | struct perf_evsel *pos; |
722 | ||
361c99a6 | 723 | list_for_each_entry(pos, &evsel_list->entries, node) { |
d6d901c2 | 724 | for (thread = 0; |
7e2ed097 | 725 | thread < evsel_list->threads->nr; |
d6d901c2 | 726 | thread++) |
69aad6f1 | 727 | ioctl(FD(pos, i, thread), |
d6d901c2 ZY |
728 | PERF_EVENT_IOC_DISABLE); |
729 | } | |
8b412664 | 730 | } |
649c48a9 | 731 | } |
de9ac07b PZ |
732 | } |
733 | ||
18483b81 | 734 | if (quiet || signr == SIGUSR1) |
b44308f5 ACM |
735 | return 0; |
736 | ||
8b412664 PZ |
737 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
738 | ||
021e9f47 IM |
739 | /* |
740 | * Approximate RIP event size: 24 bytes. | |
741 | */ | |
742 | fprintf(stderr, | |
9486aa38 | 743 | "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n", |
021e9f47 IM |
744 | (double)bytes_written / 1024.0 / 1024.0, |
745 | output_name, | |
746 | bytes_written / 24); | |
addc2785 | 747 | |
de9ac07b | 748 | return 0; |
39d17dac ACM |
749 | |
750 | out_delete_session: | |
751 | perf_session__delete(session); | |
752 | return err; | |
de9ac07b | 753 | } |
0e9b20b8 | 754 | |
0e9b20b8 | 755 | static const char * const record_usage[] = { |
9e096753 MG |
756 | "perf record [<options>] [<command>]", |
757 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
758 | NULL |
759 | }; | |
760 | ||
7865e817 FW |
761 | static bool force, append_file; |
762 | ||
bca647aa | 763 | const struct option record_options[] = { |
361c99a6 | 764 | OPT_CALLBACK('e', "event", &evsel_list, "event", |
86847b62 TG |
765 | "event selector. use 'perf list' to list available events", |
766 | parse_events), | |
361c99a6 | 767 | OPT_CALLBACK(0, "filter", &evsel_list, "filter", |
c171b552 | 768 | "event filter", parse_filter), |
0e9b20b8 | 769 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
770 | "record events on existing process id"), |
771 | OPT_INTEGER('t', "tid", &target_tid, | |
772 | "record events on existing thread id"), | |
0e9b20b8 IM |
773 | OPT_INTEGER('r', "realtime", &realtime_prio, |
774 | "collect data with this RT SCHED_FIFO priority"), | |
acac03fa KS |
775 | OPT_BOOLEAN('D', "no-delay", &nodelay, |
776 | "collect data without buffering"), | |
daac07b2 FW |
777 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
778 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
779 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
780 | "system-wide collection from all CPUs"), | |
abaff32a IM |
781 | OPT_BOOLEAN('A', "append", &append_file, |
782 | "append to the output file to do incremental profiling"), | |
c45c6ea2 SE |
783 | OPT_STRING('C', "cpu", &cpu_list, "cpu", |
784 | "list of cpus to monitor"), | |
97124d5e | 785 | OPT_BOOLEAN('f', "force", &force, |
7865e817 | 786 | "overwrite existing data file (deprecated)"), |
3de29cab | 787 | OPT_U64('c', "count", &user_interval, "event period to sample"), |
abaff32a IM |
788 | OPT_STRING('o', "output", &output_name, "file", |
789 | "output file name"), | |
2e6cdf99 SE |
790 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
791 | "child tasks do not inherit counters"), | |
1967936d ACM |
792 | OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), |
793 | OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), | |
3efa1cc9 IM |
794 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
795 | "do call-graph (stack chain/backtrace) recording"), | |
c0555642 | 796 | OPT_INCR('v', "verbose", &verbose, |
3da297a6 | 797 | "be more verbose (show counter open errors, etc)"), |
b44308f5 | 798 | OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
649c48a9 PZ |
799 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
800 | "per thread counts"), | |
4bba828d AB |
801 | OPT_BOOLEAN('d', "data", &sample_address, |
802 | "Sample addresses"), | |
9c90a61c | 803 | OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"), |
649c48a9 PZ |
804 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
805 | "don't sample"), | |
baa2f6ce | 806 | OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache, |
a1ac1d3c | 807 | "do not update the buildid cache"), |
baa2f6ce ACM |
808 | OPT_BOOLEAN('B', "no-buildid", &no_buildid, |
809 | "do not collect buildids in perf.data"), | |
0e9b20b8 IM |
810 | OPT_END() |
811 | }; | |
812 | ||
f37a291c | 813 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 | 814 | { |
69aad6f1 ACM |
815 | int err = -ENOMEM; |
816 | struct perf_evsel *pos; | |
0e9b20b8 | 817 | |
7e2ed097 | 818 | evsel_list = perf_evlist__new(NULL, NULL); |
361c99a6 ACM |
819 | if (evsel_list == NULL) |
820 | return -ENOMEM; | |
821 | ||
bca647aa | 822 | argc = parse_options(argc, argv, record_options, record_usage, |
655000e7 | 823 | PARSE_OPT_STOP_AT_NON_OPTION); |
d6d901c2 | 824 | if (!argc && target_pid == -1 && target_tid == -1 && |
c45c6ea2 | 825 | !system_wide && !cpu_list) |
bca647aa | 826 | usage_with_options(record_usage, record_options); |
0e9b20b8 | 827 | |
7865e817 FW |
828 | if (force && append_file) { |
829 | fprintf(stderr, "Can't overwrite and append at the same time." | |
830 | " You need to choose between -f and -A"); | |
bca647aa | 831 | usage_with_options(record_usage, record_options); |
7865e817 FW |
832 | } else if (append_file) { |
833 | write_mode = WRITE_APPEND; | |
834 | } else { | |
835 | write_mode = WRITE_FORCE; | |
836 | } | |
837 | ||
655000e7 | 838 | symbol__init(); |
baa2f6ce ACM |
839 | |
840 | if (no_buildid_cache || no_buildid) | |
a1ac1d3c | 841 | disable_buildid_cache(); |
655000e7 | 842 | |
361c99a6 ACM |
843 | if (evsel_list->nr_entries == 0 && |
844 | perf_evlist__add_default(evsel_list) < 0) { | |
69aad6f1 ACM |
845 | pr_err("Not enough memory for event selector list\n"); |
846 | goto out_symbol_exit; | |
bbd36e5e | 847 | } |
0e9b20b8 | 848 | |
5c98d466 | 849 | if (target_pid != -1) |
d6d901c2 | 850 | target_tid = target_pid; |
d6d901c2 | 851 | |
7e2ed097 ACM |
852 | if (perf_evlist__create_maps(evsel_list, target_pid, |
853 | target_tid, cpu_list) < 0) | |
dd7927f4 | 854 | usage_with_options(record_usage, record_options); |
69aad6f1 | 855 | |
361c99a6 | 856 | list_for_each_entry(pos, &evsel_list->entries, node) { |
7e2ed097 ACM |
857 | if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, |
858 | evsel_list->threads->nr) < 0) | |
69aad6f1 | 859 | goto out_free_fd; |
ad7f4e3f ACM |
860 | if (perf_header__push_event(pos->attr.config, event_name(pos))) |
861 | goto out_free_fd; | |
d6d901c2 | 862 | } |
5c581041 | 863 | |
7e2ed097 | 864 | if (perf_evlist__alloc_pollfd(evsel_list) < 0) |
39d17dac | 865 | goto out_free_fd; |
d6d901c2 | 866 | |
3de29cab | 867 | if (user_interval != ULLONG_MAX) |
f9212819 FW |
868 | default_interval = user_interval; |
869 | if (user_freq != UINT_MAX) | |
870 | freq = user_freq; | |
871 | ||
7e4ff9e3 MG |
872 | /* |
873 | * User specified count overrides default frequency. | |
874 | */ | |
875 | if (default_interval) | |
876 | freq = 0; | |
877 | else if (freq) { | |
878 | default_interval = freq; | |
879 | } else { | |
880 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
39d17dac | 881 | err = -EINVAL; |
5c581041 | 882 | goto out_free_fd; |
7e4ff9e3 MG |
883 | } |
884 | ||
39d17dac | 885 | err = __cmd_record(argc, argv); |
39d17dac | 886 | out_free_fd: |
7e2ed097 | 887 | perf_evlist__delete_maps(evsel_list); |
d65a458b ACM |
888 | out_symbol_exit: |
889 | symbol__exit(); | |
39d17dac | 890 | return err; |
0e9b20b8 | 891 | } |