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 ACM |
33 | #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
34 | ||
7865e817 FW |
35 | enum write_mode_t { |
36 | WRITE_FORCE, | |
37 | WRITE_APPEND | |
38 | }; | |
39 | ||
3de29cab SE |
40 | static u64 user_interval = ULLONG_MAX; |
41 | static u64 default_interval = 0; | |
a21ca2ca | 42 | |
de9ac07b | 43 | static unsigned int page_size; |
800cd25c | 44 | static unsigned int mmap_pages = UINT_MAX; |
f9212819 | 45 | static unsigned int user_freq = UINT_MAX; |
42e59d7d | 46 | static int freq = 1000; |
de9ac07b | 47 | static int output; |
529870e3 | 48 | static int pipe_output = 0; |
d7065adb | 49 | static const char *output_name = NULL; |
42e59d7d | 50 | static int group = 0; |
1967936d | 51 | static int realtime_prio = 0; |
acac03fa | 52 | static bool nodelay = false; |
c0555642 | 53 | static bool raw_samples = false; |
9c90a61c | 54 | static bool sample_id_all_avail = true; |
c0555642 | 55 | static bool system_wide = false; |
42e59d7d | 56 | static pid_t target_pid = -1; |
d6d901c2 | 57 | static pid_t target_tid = -1; |
42e59d7d | 58 | static pid_t child_pid = -1; |
2e6cdf99 | 59 | static bool no_inherit = false; |
7865e817 | 60 | static enum write_mode_t write_mode = WRITE_FORCE; |
c0555642 IM |
61 | static bool call_graph = false; |
62 | static bool inherit_stat = false; | |
63 | static bool no_samples = false; | |
64 | static bool sample_address = false; | |
9c90a61c | 65 | static bool sample_time = false; |
a1ac1d3c | 66 | static bool no_buildid = false; |
baa2f6ce | 67 | static bool no_buildid_cache = false; |
361c99a6 | 68 | static struct perf_evlist *evsel_list; |
42e59d7d IM |
69 | |
70 | static long samples = 0; | |
42e59d7d | 71 | static u64 bytes_written = 0; |
a21ca2ca | 72 | |
42e59d7d | 73 | static int file_new = 1; |
6122e4e4 | 74 | static off_t post_processing_offset; |
7c6a1c65 | 75 | |
94c744b6 | 76 | static struct perf_session *session; |
c45c6ea2 | 77 | static const char *cpu_list; |
f5970550 | 78 | |
9215545e TZ |
79 | static void advance_output(size_t size) |
80 | { | |
81 | bytes_written += size; | |
82 | } | |
83 | ||
f5970550 PZ |
84 | static void write_output(void *buf, size_t size) |
85 | { | |
86 | while (size) { | |
87 | int ret = write(output, buf, size); | |
88 | ||
89 | if (ret < 0) | |
90 | die("failed to write"); | |
91 | ||
92 | size -= ret; | |
93 | buf += ret; | |
94 | ||
95 | bytes_written += ret; | |
96 | } | |
97 | } | |
98 | ||
8115d60c | 99 | static int process_synthesized_event(union perf_event *event, |
8d50e5b4 | 100 | struct perf_sample *sample __used, |
d8f66248 | 101 | struct perf_session *self __used) |
234fbbf5 | 102 | { |
6122e4e4 | 103 | write_output(event, event->header.size); |
234fbbf5 ACM |
104 | return 0; |
105 | } | |
106 | ||
744bd8aa | 107 | static void mmap_read(struct perf_mmap *md) |
de9ac07b | 108 | { |
744bd8aa | 109 | unsigned int head = perf_mmap__read_head(md); |
de9ac07b PZ |
110 | unsigned int old = md->prev; |
111 | unsigned char *data = md->base + page_size; | |
112 | unsigned long size; | |
113 | void *buf; | |
de9ac07b | 114 | |
dc82009a ACM |
115 | if (old == head) |
116 | return; | |
117 | ||
118 | samples++; | |
de9ac07b PZ |
119 | |
120 | size = head - old; | |
121 | ||
122 | if ((old & md->mask) + size != (head & md->mask)) { | |
123 | buf = &data[old & md->mask]; | |
124 | size = md->mask + 1 - (old & md->mask); | |
125 | old += size; | |
021e9f47 | 126 | |
6122e4e4 | 127 | write_output(buf, size); |
de9ac07b PZ |
128 | } |
129 | ||
130 | buf = &data[old & md->mask]; | |
131 | size = head - old; | |
132 | old += size; | |
021e9f47 | 133 | |
6122e4e4 | 134 | write_output(buf, size); |
de9ac07b PZ |
135 | |
136 | md->prev = old; | |
115d2d89 | 137 | perf_mmap__write_tail(md, old); |
de9ac07b PZ |
138 | } |
139 | ||
140 | static volatile int done = 0; | |
f7b7c26e | 141 | static volatile int signr = -1; |
de9ac07b | 142 | |
16c8a109 | 143 | static void sig_handler(int sig) |
de9ac07b | 144 | { |
16c8a109 | 145 | done = 1; |
f7b7c26e PZ |
146 | signr = sig; |
147 | } | |
148 | ||
149 | static void sig_atexit(void) | |
150 | { | |
5ffc8881 | 151 | if (child_pid > 0) |
933da83a CW |
152 | kill(child_pid, SIGTERM); |
153 | ||
18483b81 | 154 | if (signr == -1 || signr == SIGUSR1) |
f7b7c26e PZ |
155 | return; |
156 | ||
157 | signal(signr, SIG_DFL); | |
158 | kill(getpid(), signr); | |
de9ac07b PZ |
159 | } |
160 | ||
dd7927f4 ACM |
161 | static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist) |
162 | { | |
163 | struct perf_event_attr *attr = &evsel->attr; | |
164 | int track = !evsel->idx; /* only the first counter needs these */ | |
7c6a1c65 | 165 | |
5d2cd909 | 166 | attr->inherit = !no_inherit; |
7c6a1c65 PZ |
167 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | |
168 | PERF_FORMAT_TOTAL_TIME_RUNNING | | |
169 | PERF_FORMAT_ID; | |
16c8a109 | 170 | |
3a9f131f | 171 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
3efa1cc9 | 172 | |
361c99a6 | 173 | if (evlist->nr_entries > 1) |
8907fd60 EM |
174 | attr->sample_type |= PERF_SAMPLE_ID; |
175 | ||
f9212819 FW |
176 | /* |
177 | * We default some events to a 1 default interval. But keep | |
178 | * it a weak assumption overridable by the user. | |
179 | */ | |
180 | if (!attr->sample_period || (user_freq != UINT_MAX && | |
3de29cab | 181 | user_interval != ULLONG_MAX)) { |
f9212819 FW |
182 | if (freq) { |
183 | attr->sample_type |= PERF_SAMPLE_PERIOD; | |
184 | attr->freq = 1; | |
185 | attr->sample_freq = freq; | |
186 | } else { | |
187 | attr->sample_period = default_interval; | |
188 | } | |
1dba15e7 | 189 | } |
3efa1cc9 | 190 | |
649c48a9 PZ |
191 | if (no_samples) |
192 | attr->sample_freq = 0; | |
193 | ||
194 | if (inherit_stat) | |
195 | attr->inherit_stat = 1; | |
196 | ||
3af9e859 | 197 | if (sample_address) { |
4bba828d | 198 | attr->sample_type |= PERF_SAMPLE_ADDR; |
3af9e859 EM |
199 | attr->mmap_data = track; |
200 | } | |
4bba828d | 201 | |
3efa1cc9 IM |
202 | if (call_graph) |
203 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; | |
204 | ||
f60f3593 AS |
205 | if (system_wide) |
206 | attr->sample_type |= PERF_SAMPLE_CPU; | |
207 | ||
a43d3f08 ACM |
208 | if (sample_id_all_avail && |
209 | (sample_time || system_wide || !no_inherit || cpu_list)) | |
9c90a61c ACM |
210 | attr->sample_type |= PERF_SAMPLE_TIME; |
211 | ||
cd6feeea | 212 | if (raw_samples) { |
6ddf259d | 213 | attr->sample_type |= PERF_SAMPLE_TIME; |
daac07b2 | 214 | attr->sample_type |= PERF_SAMPLE_RAW; |
cd6feeea IM |
215 | attr->sample_type |= PERF_SAMPLE_CPU; |
216 | } | |
f413cdb8 | 217 | |
acac03fa KS |
218 | if (nodelay) { |
219 | attr->watermark = 0; | |
220 | attr->wakeup_events = 1; | |
221 | } | |
222 | ||
a21ca2ca IM |
223 | attr->mmap = track; |
224 | attr->comm = track; | |
dd7927f4 | 225 | |
2e6cdf99 | 226 | if (target_pid == -1 && target_tid == -1 && !system_wide) { |
46be604b | 227 | attr->disabled = 1; |
bedbfdea | 228 | attr->enable_on_exec = 1; |
46be604b | 229 | } |
dd7927f4 | 230 | } |
bedbfdea | 231 | |
a91e5431 ACM |
232 | static bool perf_evlist__equal(struct perf_evlist *evlist, |
233 | struct perf_evlist *other) | |
234 | { | |
235 | struct perf_evsel *pos, *pair; | |
236 | ||
237 | if (evlist->nr_entries != other->nr_entries) | |
238 | return false; | |
239 | ||
240 | pair = list_entry(other->entries.next, struct perf_evsel, node); | |
241 | ||
242 | list_for_each_entry(pos, &evlist->entries, node) { | |
243 | if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0)) | |
244 | return false; | |
245 | pair = list_entry(pair->node.next, struct perf_evsel, node); | |
246 | } | |
247 | ||
248 | return true; | |
249 | } | |
250 | ||
dd7927f4 ACM |
251 | static void open_counters(struct perf_evlist *evlist) |
252 | { | |
253 | struct perf_evsel *pos; | |
dd7927f4 | 254 | |
5d2cd909 ACM |
255 | if (evlist->cpus->map[0] < 0) |
256 | no_inherit = true; | |
257 | ||
dd7927f4 ACM |
258 | list_for_each_entry(pos, &evlist->entries, node) { |
259 | struct perf_event_attr *attr = &pos->attr; | |
260 | /* | |
261 | * Check if parse_single_tracepoint_event has already asked for | |
262 | * PERF_SAMPLE_TIME. | |
263 | * | |
264 | * XXX this is kludgy but short term fix for problems introduced by | |
265 | * eac23d1c that broke 'perf script' by having different sample_types | |
266 | * when using multiple tracepoint events when we use a perf binary | |
267 | * that tries to use sample_id_all on an older kernel. | |
268 | * | |
269 | * We need to move counter creation to perf_session, support | |
270 | * different sample_types, etc. | |
271 | */ | |
272 | bool time_needed = attr->sample_type & PERF_SAMPLE_TIME; | |
d6d901c2 | 273 | |
dd7927f4 ACM |
274 | config_attr(pos, evlist); |
275 | retry_sample_id: | |
276 | attr->sample_id_all = sample_id_all_avail ? 1 : 0; | |
277 | try_again: | |
5d2cd909 | 278 | if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group) < 0) { |
d6d901c2 ZY |
279 | int err = errno; |
280 | ||
c286c419 ACM |
281 | if (err == EPERM || err == EACCES) { |
282 | ui__warning_paranoid(); | |
283 | exit(EXIT_FAILURE); | |
284 | } else if (err == ENODEV && cpu_list) { | |
d6d901c2 ZY |
285 | die("No such device - did you specify" |
286 | " an out-of-range profile CPU?\n"); | |
9c90a61c ACM |
287 | } else if (err == EINVAL && sample_id_all_avail) { |
288 | /* | |
289 | * Old kernel, no attr->sample_id_type_all field | |
290 | */ | |
291 | sample_id_all_avail = false; | |
a43d3f08 | 292 | if (!sample_time && !raw_samples && !time_needed) |
eac23d1c IM |
293 | attr->sample_type &= ~PERF_SAMPLE_TIME; |
294 | ||
9c90a61c | 295 | goto retry_sample_id; |
d6d901c2 | 296 | } |
3da297a6 | 297 | |
d6d901c2 ZY |
298 | /* |
299 | * If it's cycles then fall back to hrtimer | |
300 | * based cpu-clock-tick sw counter, which | |
301 | * is always available even if no PMU support: | |
302 | */ | |
303 | if (attr->type == PERF_TYPE_HARDWARE | |
304 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { | |
305 | ||
306 | if (verbose) | |
ca6a4258 DA |
307 | ui__warning("The cycles event is not supported, " |
308 | "trying to fall back to cpu-clock-ticks\n"); | |
d6d901c2 ZY |
309 | attr->type = PERF_TYPE_SOFTWARE; |
310 | attr->config = PERF_COUNT_SW_CPU_CLOCK; | |
311 | goto try_again; | |
312 | } | |
ca6a4258 DA |
313 | |
314 | if (err == ENOENT) { | |
315 | ui__warning("The %s event is not supported.\n", | |
316 | event_name(pos)); | |
317 | exit(EXIT_FAILURE); | |
318 | } | |
319 | ||
d6d901c2 | 320 | printf("\n"); |
d9cf837e | 321 | error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", |
dd7927f4 | 322 | err, strerror(err)); |
bfd45118 SK |
323 | |
324 | #if defined(__i386__) || defined(__x86_64__) | |
d6d901c2 ZY |
325 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
326 | die("No hardware sampling interrupt available." | |
327 | " No APIC? If so then you can boot the kernel" | |
328 | " with the \"lapic\" boot parameter to" | |
329 | " force-enable it.\n"); | |
bfd45118 SK |
330 | #endif |
331 | ||
d6d901c2 | 332 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
c171b552 LZ |
333 | } |
334 | } | |
a43d3f08 | 335 | |
0a102479 FW |
336 | if (perf_evlist__set_filters(evlist)) { |
337 | error("failed to set filter with %d (%s)\n", errno, | |
338 | strerror(errno)); | |
339 | exit(-1); | |
340 | } | |
341 | ||
7e2ed097 | 342 | if (perf_evlist__mmap(evlist, mmap_pages, false) < 0) |
0a27d7f9 ACM |
343 | die("failed to mmap with %d (%s)\n", errno, strerror(errno)); |
344 | ||
a91e5431 ACM |
345 | if (file_new) |
346 | session->evlist = evlist; | |
347 | else { | |
348 | if (!perf_evlist__equal(session->evlist, evlist)) { | |
349 | fprintf(stderr, "incompatible append\n"); | |
350 | exit(-1); | |
351 | } | |
352 | } | |
353 | ||
354 | perf_session__update_sample_type(session); | |
16c8a109 PZ |
355 | } |
356 | ||
6122e4e4 ACM |
357 | static int process_buildids(void) |
358 | { | |
359 | u64 size = lseek(output, 0, SEEK_CUR); | |
360 | ||
9f591fd7 ACM |
361 | if (size == 0) |
362 | return 0; | |
363 | ||
6122e4e4 ACM |
364 | session->fd = output; |
365 | return __perf_session__process_events(session, post_processing_offset, | |
366 | size - post_processing_offset, | |
367 | size, &build_id__mark_dso_hit_ops); | |
368 | } | |
369 | ||
f5970550 PZ |
370 | static void atexit_header(void) |
371 | { | |
c7929e47 TZ |
372 | if (!pipe_output) { |
373 | session->header.data_size += bytes_written; | |
f5970550 | 374 | |
baa2f6ce ACM |
375 | if (!no_buildid) |
376 | process_buildids(); | |
a91e5431 | 377 | perf_session__write_header(session, evsel_list, output, true); |
39d17dac | 378 | perf_session__delete(session); |
361c99a6 | 379 | perf_evlist__delete(evsel_list); |
d65a458b | 380 | symbol__exit(); |
c7929e47 | 381 | } |
f5970550 PZ |
382 | } |
383 | ||
8115d60c | 384 | static void perf_event__synthesize_guest_os(struct machine *machine, void *data) |
a1645ce1 ZY |
385 | { |
386 | int err; | |
23346f21 | 387 | struct perf_session *psession = data; |
a1645ce1 | 388 | |
23346f21 | 389 | if (machine__is_host(machine)) |
a1645ce1 ZY |
390 | return; |
391 | ||
392 | /* | |
393 | *As for guest kernel when processing subcommand record&report, | |
394 | *we arrange module mmap prior to guest kernel mmap and trigger | |
395 | *a preload dso because default guest module symbols are loaded | |
396 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This | |
397 | *method is used to avoid symbol missing when the first addr is | |
398 | *in module instead of in guest kernel. | |
399 | */ | |
8115d60c ACM |
400 | err = perf_event__synthesize_modules(process_synthesized_event, |
401 | psession, machine); | |
a1645ce1 ZY |
402 | if (err < 0) |
403 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 404 | " relocation symbol.\n", machine->pid); |
a1645ce1 | 405 | |
a1645ce1 ZY |
406 | /* |
407 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms | |
408 | * have no _text sometimes. | |
409 | */ | |
8115d60c ACM |
410 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
411 | psession, machine, "_text"); | |
a1645ce1 | 412 | if (err < 0) |
8115d60c ACM |
413 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
414 | psession, machine, | |
415 | "_stext"); | |
a1645ce1 ZY |
416 | if (err < 0) |
417 | pr_err("Couldn't record guest kernel [%d]'s reference" | |
23346f21 | 418 | " relocation symbol.\n", machine->pid); |
a1645ce1 ZY |
419 | } |
420 | ||
98402807 FW |
421 | static struct perf_event_header finished_round_event = { |
422 | .size = sizeof(struct perf_event_header), | |
423 | .type = PERF_RECORD_FINISHED_ROUND, | |
424 | }; | |
425 | ||
426 | static void mmap_read_all(void) | |
427 | { | |
0e2e63dd | 428 | int i; |
98402807 | 429 | |
aece948f | 430 | for (i = 0; i < evsel_list->nr_mmaps; i++) { |
0a27d7f9 ACM |
431 | if (evsel_list->mmap[i].base) |
432 | mmap_read(&evsel_list->mmap[i]); | |
98402807 FW |
433 | } |
434 | ||
435 | if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) | |
436 | write_output(&finished_round_event, sizeof(finished_round_event)); | |
437 | } | |
438 | ||
d4db3f16 | 439 | static int __cmd_record(int argc, const char **argv) |
16c8a109 | 440 | { |
69aad6f1 | 441 | int i; |
abaff32a | 442 | struct stat st; |
abaff32a | 443 | int flags; |
4dc0a04b | 444 | int err; |
8b412664 | 445 | unsigned long waking = 0; |
856e9660 | 446 | int child_ready_pipe[2], go_pipe[2]; |
46be604b | 447 | const bool forks = argc > 0; |
856e9660 | 448 | char buf; |
23346f21 | 449 | struct machine *machine; |
de9ac07b PZ |
450 | |
451 | page_size = sysconf(_SC_PAGE_SIZE); | |
de9ac07b | 452 | |
f5970550 PZ |
453 | atexit(sig_atexit); |
454 | signal(SIGCHLD, sig_handler); | |
455 | signal(SIGINT, sig_handler); | |
18483b81 | 456 | signal(SIGUSR1, sig_handler); |
f5970550 | 457 | |
d4db3f16 | 458 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
856e9660 PZ |
459 | perror("failed to create pipes"); |
460 | exit(-1); | |
461 | } | |
462 | ||
d7065adb FBH |
463 | if (!output_name) { |
464 | if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode)) | |
465 | pipe_output = 1; | |
466 | else | |
467 | output_name = "perf.data"; | |
468 | } | |
469 | if (output_name) { | |
470 | if (!strcmp(output_name, "-")) | |
471 | pipe_output = 1; | |
472 | else if (!stat(output_name, &st) && st.st_size) { | |
473 | if (write_mode == WRITE_FORCE) { | |
474 | char oldname[PATH_MAX]; | |
475 | snprintf(oldname, sizeof(oldname), "%s.old", | |
476 | output_name); | |
477 | unlink(oldname); | |
478 | rename(output_name, oldname); | |
479 | } | |
480 | } else if (write_mode == WRITE_APPEND) { | |
481 | write_mode = WRITE_FORCE; | |
266e0e21 | 482 | } |
97124d5e PZ |
483 | } |
484 | ||
f887f301 | 485 | flags = O_CREAT|O_RDWR; |
7865e817 | 486 | if (write_mode == WRITE_APPEND) |
f5970550 | 487 | file_new = 0; |
abaff32a IM |
488 | else |
489 | flags |= O_TRUNC; | |
490 | ||
529870e3 TZ |
491 | if (pipe_output) |
492 | output = STDOUT_FILENO; | |
493 | else | |
494 | output = open(output_name, flags, S_IRUSR | S_IWUSR); | |
de9ac07b PZ |
495 | if (output < 0) { |
496 | perror("failed to create output file"); | |
497 | exit(-1); | |
498 | } | |
499 | ||
7865e817 | 500 | session = perf_session__new(output_name, O_WRONLY, |
21ef97f0 | 501 | write_mode == WRITE_FORCE, false, NULL); |
94c744b6 | 502 | if (session == NULL) { |
a9a70bbc ACM |
503 | pr_err("Not enough memory for reading perf file header\n"); |
504 | return -1; | |
505 | } | |
506 | ||
baa2f6ce ACM |
507 | if (!no_buildid) |
508 | perf_header__set_feat(&session->header, HEADER_BUILD_ID); | |
509 | ||
4dc0a04b | 510 | if (!file_new) { |
a91e5431 | 511 | err = perf_session__read_header(session, output); |
4dc0a04b | 512 | if (err < 0) |
39d17dac | 513 | goto out_delete_session; |
4dc0a04b ACM |
514 | } |
515 | ||
361c99a6 | 516 | if (have_tracepoints(&evsel_list->entries)) |
94c744b6 | 517 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
03456a15 | 518 | |
800cd25c FW |
519 | /* 512 kiB: default amount of unprivileged mlocked memory */ |
520 | if (mmap_pages == UINT_MAX) | |
521 | mmap_pages = (512 * 1024) / page_size; | |
522 | ||
d4db3f16 | 523 | if (forks) { |
46be604b | 524 | child_pid = fork(); |
2fb750e8 | 525 | if (child_pid < 0) { |
856e9660 PZ |
526 | perror("failed to fork"); |
527 | exit(-1); | |
528 | } | |
7c6a1c65 | 529 | |
46be604b | 530 | if (!child_pid) { |
529870e3 TZ |
531 | if (pipe_output) |
532 | dup2(2, 1); | |
856e9660 PZ |
533 | close(child_ready_pipe[0]); |
534 | close(go_pipe[1]); | |
535 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
536 | ||
537 | /* | |
538 | * Do a dummy execvp to get the PLT entry resolved, | |
539 | * so we avoid the resolver overhead on the real | |
540 | * execvp call. | |
541 | */ | |
542 | execvp("", (char **)argv); | |
543 | ||
544 | /* | |
545 | * Tell the parent we're ready to go | |
546 | */ | |
547 | close(child_ready_pipe[1]); | |
548 | ||
549 | /* | |
550 | * Wait until the parent tells us to go. | |
551 | */ | |
552 | if (read(go_pipe[0], &buf, 1) == -1) | |
553 | perror("unable to read pipe"); | |
554 | ||
555 | execvp(argv[0], (char **)argv); | |
556 | ||
557 | perror(argv[0]); | |
18483b81 | 558 | kill(getppid(), SIGUSR1); |
856e9660 | 559 | exit(-1); |
0a5ac846 | 560 | } |
856e9660 | 561 | |
d6d901c2 | 562 | if (!system_wide && target_tid == -1 && target_pid == -1) |
7e2ed097 | 563 | evsel_list->threads->map[0] = child_pid; |
d6d901c2 | 564 | |
856e9660 PZ |
565 | close(child_ready_pipe[1]); |
566 | close(go_pipe[0]); | |
567 | /* | |
568 | * wait for child to settle | |
569 | */ | |
570 | if (read(child_ready_pipe[0], &buf, 1) == -1) { | |
571 | perror("unable to read pipe"); | |
572 | exit(-1); | |
573 | } | |
574 | close(child_ready_pipe[0]); | |
575 | } | |
576 | ||
dd7927f4 | 577 | open_counters(evsel_list); |
de9ac07b | 578 | |
712a4b60 ACM |
579 | /* |
580 | * perf_session__delete(session) will be called at atexit_header() | |
581 | */ | |
582 | atexit(atexit_header); | |
583 | ||
529870e3 TZ |
584 | if (pipe_output) { |
585 | err = perf_header__write_pipe(output); | |
586 | if (err < 0) | |
587 | return err; | |
588 | } else if (file_new) { | |
a91e5431 ACM |
589 | err = perf_session__write_header(session, evsel_list, |
590 | output, false); | |
d5eed904 ACM |
591 | if (err < 0) |
592 | return err; | |
56b03f3c ACM |
593 | } |
594 | ||
6122e4e4 ACM |
595 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
596 | ||
2c46dbb5 | 597 | if (pipe_output) { |
a91e5431 ACM |
598 | err = perf_session__synthesize_attrs(session, |
599 | process_synthesized_event); | |
2c46dbb5 TZ |
600 | if (err < 0) { |
601 | pr_err("Couldn't synthesize attrs.\n"); | |
602 | return err; | |
603 | } | |
cd19a035 | 604 | |
8115d60c ACM |
605 | err = perf_event__synthesize_event_types(process_synthesized_event, |
606 | session); | |
cd19a035 TZ |
607 | if (err < 0) { |
608 | pr_err("Couldn't synthesize event_types.\n"); | |
609 | return err; | |
610 | } | |
9215545e | 611 | |
361c99a6 | 612 | if (have_tracepoints(&evsel_list->entries)) { |
63e0c771 TZ |
613 | /* |
614 | * FIXME err <= 0 here actually means that | |
615 | * there were no tracepoints so its not really | |
616 | * an error, just that we don't need to | |
617 | * synthesize anything. We really have to | |
618 | * return this more properly and also | |
619 | * propagate errors that now are calling die() | |
620 | */ | |
8115d60c ACM |
621 | err = perf_event__synthesize_tracing_data(output, evsel_list, |
622 | process_synthesized_event, | |
623 | session); | |
63e0c771 TZ |
624 | if (err <= 0) { |
625 | pr_err("Couldn't record tracing data.\n"); | |
626 | return err; | |
627 | } | |
2c9faa06 | 628 | advance_output(err); |
63e0c771 | 629 | } |
2c46dbb5 TZ |
630 | } |
631 | ||
23346f21 ACM |
632 | machine = perf_session__find_host_machine(session); |
633 | if (!machine) { | |
a1645ce1 ZY |
634 | pr_err("Couldn't find native kernel information.\n"); |
635 | return -1; | |
636 | } | |
637 | ||
8115d60c ACM |
638 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
639 | session, machine, "_text"); | |
70162138 | 640 | if (err < 0) |
8115d60c ACM |
641 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
642 | session, machine, "_stext"); | |
c1a3a4b9 ACM |
643 | if (err < 0) |
644 | pr_err("Couldn't record kernel reference relocation symbol\n" | |
645 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
646 | "Check /proc/kallsyms permission or run as root.\n"); | |
b7cece76 | 647 | |
8115d60c ACM |
648 | err = perf_event__synthesize_modules(process_synthesized_event, |
649 | session, machine); | |
c1a3a4b9 ACM |
650 | if (err < 0) |
651 | pr_err("Couldn't record kernel module information.\n" | |
652 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" | |
653 | "Check /proc/modules permission or run as root.\n"); | |
654 | ||
a1645ce1 | 655 | if (perf_guest) |
8115d60c ACM |
656 | perf_session__process_machines(session, |
657 | perf_event__synthesize_guest_os); | |
7c6a1c65 | 658 | |
cf103a14 | 659 | if (!system_wide) |
7c940c18 ACM |
660 | perf_event__synthesize_thread_map(evsel_list->threads, |
661 | process_synthesized_event, | |
662 | session); | |
234fbbf5 | 663 | else |
8115d60c ACM |
664 | perf_event__synthesize_threads(process_synthesized_event, |
665 | session); | |
7c6a1c65 | 666 | |
de9ac07b PZ |
667 | if (realtime_prio) { |
668 | struct sched_param param; | |
669 | ||
670 | param.sched_priority = realtime_prio; | |
671 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { | |
6beba7ad | 672 | pr_err("Could not set realtime priority.\n"); |
de9ac07b PZ |
673 | exit(-1); |
674 | } | |
675 | } | |
676 | ||
856e9660 PZ |
677 | /* |
678 | * Let the child rip | |
679 | */ | |
d4db3f16 ACM |
680 | if (forks) |
681 | close(go_pipe[1]); | |
856e9660 | 682 | |
649c48a9 | 683 | for (;;) { |
2debbc83 | 684 | int hits = samples; |
d6d901c2 | 685 | int thread; |
de9ac07b | 686 | |
98402807 | 687 | mmap_read_all(); |
de9ac07b | 688 | |
649c48a9 PZ |
689 | if (hits == samples) { |
690 | if (done) | |
691 | break; | |
5c581041 | 692 | err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1); |
8b412664 PZ |
693 | waking++; |
694 | } | |
695 | ||
696 | if (done) { | |
7e2ed097 | 697 | for (i = 0; i < evsel_list->cpus->nr; i++) { |
69aad6f1 ACM |
698 | struct perf_evsel *pos; |
699 | ||
361c99a6 | 700 | list_for_each_entry(pos, &evsel_list->entries, node) { |
d6d901c2 | 701 | for (thread = 0; |
7e2ed097 | 702 | thread < evsel_list->threads->nr; |
d6d901c2 | 703 | thread++) |
69aad6f1 | 704 | ioctl(FD(pos, i, thread), |
d6d901c2 ZY |
705 | PERF_EVENT_IOC_DISABLE); |
706 | } | |
8b412664 | 707 | } |
649c48a9 | 708 | } |
de9ac07b PZ |
709 | } |
710 | ||
18483b81 | 711 | if (quiet || signr == SIGUSR1) |
b44308f5 ACM |
712 | return 0; |
713 | ||
8b412664 PZ |
714 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
715 | ||
021e9f47 IM |
716 | /* |
717 | * Approximate RIP event size: 24 bytes. | |
718 | */ | |
719 | fprintf(stderr, | |
9486aa38 | 720 | "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n", |
021e9f47 IM |
721 | (double)bytes_written / 1024.0 / 1024.0, |
722 | output_name, | |
723 | bytes_written / 24); | |
addc2785 | 724 | |
de9ac07b | 725 | return 0; |
39d17dac ACM |
726 | |
727 | out_delete_session: | |
728 | perf_session__delete(session); | |
729 | return err; | |
de9ac07b | 730 | } |
0e9b20b8 | 731 | |
0e9b20b8 | 732 | static const char * const record_usage[] = { |
9e096753 MG |
733 | "perf record [<options>] [<command>]", |
734 | "perf record [<options>] -- <command> [<options>]", | |
0e9b20b8 IM |
735 | NULL |
736 | }; | |
737 | ||
7865e817 FW |
738 | static bool force, append_file; |
739 | ||
bca647aa | 740 | const struct option record_options[] = { |
361c99a6 | 741 | OPT_CALLBACK('e', "event", &evsel_list, "event", |
86847b62 TG |
742 | "event selector. use 'perf list' to list available events", |
743 | parse_events), | |
361c99a6 | 744 | OPT_CALLBACK(0, "filter", &evsel_list, "filter", |
c171b552 | 745 | "event filter", parse_filter), |
0e9b20b8 | 746 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
747 | "record events on existing process id"), |
748 | OPT_INTEGER('t', "tid", &target_tid, | |
749 | "record events on existing thread id"), | |
0e9b20b8 IM |
750 | OPT_INTEGER('r', "realtime", &realtime_prio, |
751 | "collect data with this RT SCHED_FIFO priority"), | |
acac03fa KS |
752 | OPT_BOOLEAN('D', "no-delay", &nodelay, |
753 | "collect data without buffering"), | |
daac07b2 FW |
754 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
755 | "collect raw sample records from all opened counters"), | |
0e9b20b8 IM |
756 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
757 | "system-wide collection from all CPUs"), | |
abaff32a IM |
758 | OPT_BOOLEAN('A', "append", &append_file, |
759 | "append to the output file to do incremental profiling"), | |
c45c6ea2 SE |
760 | OPT_STRING('C', "cpu", &cpu_list, "cpu", |
761 | "list of cpus to monitor"), | |
97124d5e | 762 | OPT_BOOLEAN('f', "force", &force, |
7865e817 | 763 | "overwrite existing data file (deprecated)"), |
3de29cab | 764 | OPT_U64('c', "count", &user_interval, "event period to sample"), |
abaff32a IM |
765 | OPT_STRING('o', "output", &output_name, "file", |
766 | "output file name"), | |
2e6cdf99 SE |
767 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
768 | "child tasks do not inherit counters"), | |
1967936d ACM |
769 | OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), |
770 | OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), | |
3efa1cc9 IM |
771 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
772 | "do call-graph (stack chain/backtrace) recording"), | |
c0555642 | 773 | OPT_INCR('v', "verbose", &verbose, |
3da297a6 | 774 | "be more verbose (show counter open errors, etc)"), |
b44308f5 | 775 | OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
649c48a9 PZ |
776 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
777 | "per thread counts"), | |
4bba828d AB |
778 | OPT_BOOLEAN('d', "data", &sample_address, |
779 | "Sample addresses"), | |
9c90a61c | 780 | OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"), |
649c48a9 PZ |
781 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
782 | "don't sample"), | |
baa2f6ce | 783 | OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache, |
a1ac1d3c | 784 | "do not update the buildid cache"), |
baa2f6ce ACM |
785 | OPT_BOOLEAN('B', "no-buildid", &no_buildid, |
786 | "do not collect buildids in perf.data"), | |
023695d9 SE |
787 | OPT_CALLBACK('G', "cgroup", &evsel_list, "name", |
788 | "monitor event in cgroup name only", | |
789 | parse_cgroups), | |
0e9b20b8 IM |
790 | OPT_END() |
791 | }; | |
792 | ||
f37a291c | 793 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
0e9b20b8 | 794 | { |
69aad6f1 ACM |
795 | int err = -ENOMEM; |
796 | struct perf_evsel *pos; | |
0e9b20b8 | 797 | |
7e2ed097 | 798 | evsel_list = perf_evlist__new(NULL, NULL); |
361c99a6 ACM |
799 | if (evsel_list == NULL) |
800 | return -ENOMEM; | |
801 | ||
bca647aa | 802 | argc = parse_options(argc, argv, record_options, record_usage, |
655000e7 | 803 | PARSE_OPT_STOP_AT_NON_OPTION); |
d6d901c2 | 804 | if (!argc && target_pid == -1 && target_tid == -1 && |
c45c6ea2 | 805 | !system_wide && !cpu_list) |
bca647aa | 806 | usage_with_options(record_usage, record_options); |
0e9b20b8 | 807 | |
7865e817 FW |
808 | if (force && append_file) { |
809 | fprintf(stderr, "Can't overwrite and append at the same time." | |
810 | " You need to choose between -f and -A"); | |
bca647aa | 811 | usage_with_options(record_usage, record_options); |
7865e817 FW |
812 | } else if (append_file) { |
813 | write_mode = WRITE_APPEND; | |
814 | } else { | |
815 | write_mode = WRITE_FORCE; | |
816 | } | |
817 | ||
023695d9 SE |
818 | if (nr_cgroups && !system_wide) { |
819 | fprintf(stderr, "cgroup monitoring only available in" | |
820 | " system-wide mode\n"); | |
821 | usage_with_options(record_usage, record_options); | |
822 | } | |
823 | ||
655000e7 | 824 | symbol__init(); |
baa2f6ce | 825 | |
ec80fde7 ACM |
826 | if (symbol_conf.kptr_restrict) |
827 | pr_warning("WARNING: Kernel address maps " | |
828 | "(/proc/{kallsyms,modules}) are restricted, " | |
829 | "check /proc/sys/kernel/kptr_restrict.\n\n" | |
830 | "Samples in kernel functions may not be resolved " | |
831 | "if a suitable vmlinux file is not found in the " | |
832 | "buildid cache or in the vmlinux path.\n\n" | |
833 | "Samples in kernel modules won't be resolved " | |
834 | "at all.\n\n" | |
835 | "If some relocation was applied (e.g. kexec) " | |
836 | "symbols may be misresolved even with a suitable " | |
837 | "vmlinux or kallsyms file.\n\n"); | |
838 | ||
baa2f6ce | 839 | if (no_buildid_cache || no_buildid) |
a1ac1d3c | 840 | disable_buildid_cache(); |
655000e7 | 841 | |
361c99a6 ACM |
842 | if (evsel_list->nr_entries == 0 && |
843 | perf_evlist__add_default(evsel_list) < 0) { | |
69aad6f1 ACM |
844 | pr_err("Not enough memory for event selector list\n"); |
845 | goto out_symbol_exit; | |
bbd36e5e | 846 | } |
0e9b20b8 | 847 | |
5c98d466 | 848 | if (target_pid != -1) |
d6d901c2 | 849 | target_tid = target_pid; |
d6d901c2 | 850 | |
7e2ed097 ACM |
851 | if (perf_evlist__create_maps(evsel_list, target_pid, |
852 | target_tid, cpu_list) < 0) | |
dd7927f4 | 853 | usage_with_options(record_usage, record_options); |
69aad6f1 | 854 | |
361c99a6 | 855 | list_for_each_entry(pos, &evsel_list->entries, node) { |
7e2ed097 ACM |
856 | if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, |
857 | evsel_list->threads->nr) < 0) | |
69aad6f1 | 858 | goto out_free_fd; |
ad7f4e3f ACM |
859 | if (perf_header__push_event(pos->attr.config, event_name(pos))) |
860 | goto out_free_fd; | |
d6d901c2 | 861 | } |
5c581041 | 862 | |
7e2ed097 | 863 | if (perf_evlist__alloc_pollfd(evsel_list) < 0) |
39d17dac | 864 | goto out_free_fd; |
d6d901c2 | 865 | |
3de29cab | 866 | if (user_interval != ULLONG_MAX) |
f9212819 FW |
867 | default_interval = user_interval; |
868 | if (user_freq != UINT_MAX) | |
869 | freq = user_freq; | |
870 | ||
7e4ff9e3 MG |
871 | /* |
872 | * User specified count overrides default frequency. | |
873 | */ | |
874 | if (default_interval) | |
875 | freq = 0; | |
876 | else if (freq) { | |
877 | default_interval = freq; | |
878 | } else { | |
879 | fprintf(stderr, "frequency and count are zero, aborting\n"); | |
39d17dac | 880 | err = -EINVAL; |
5c581041 | 881 | goto out_free_fd; |
7e4ff9e3 MG |
882 | } |
883 | ||
39d17dac | 884 | err = __cmd_record(argc, argv); |
39d17dac | 885 | out_free_fd: |
7e2ed097 | 886 | perf_evlist__delete_maps(evsel_list); |
d65a458b ACM |
887 | out_symbol_exit: |
888 | symbol__exit(); | |
39d17dac | 889 | return err; |
0e9b20b8 | 890 | } |