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1 /*

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.

7 */

8 #define _FILE_OFFSET_BITS 64

9

10 #include "builtin.h"

11

12 #include "perf.h"

13

14 #include "util/build-id.h"

15 #include "util/util.h"

16 #include "util/parse-options.h"

17 #include "util/parse-events.h"

18

19 #include "util/header.h"

20 #include "util/event.h"

21 #include "util/debug.h"

22 #include "util/session.h"

23 #include "util/symbol.h"

24 #include "util/cpumap.h"

25

26 #include <unistd.h>

27 #include <sched.h>

28 #include <sys/mman.h>

29

30 enum write_mode_t {

31 WRITE_FORCE,

32 WRITE_APPEND

33 };

34

35 static int *fd[MAX_NR_CPUS][MAX_COUNTERS];

36

37 static u64 user_interval = ULLONG_MAX;

38 static u64 default_interval = 0;

39

40 static int nr_cpus = 0;

41 static unsigned int page_size;

42 static unsigned int mmap_pages = 128;

43 static unsigned int user_freq = UINT_MAX;

44 static int freq = 1000;

45 static int output;

46 static int pipe_output = 0;

47 static const char *output_name = "perf.data";

48 static int group = 0;

49 static int realtime_prio = 0;

50 static bool raw_samples = false;

51 static bool system_wide = false;

52 static pid_t target_pid = -1;

53 static pid_t target_tid = -1;

54 static pid_t *all_tids = NULL;

55 static int thread_num = 0;

56 static pid_t child_pid = -1;

57 static bool no_inherit = false;

58 static enum write_mode_t write_mode = WRITE_FORCE;

59 static bool call_graph = false;

60 static bool inherit_stat = false;

61 static bool no_samples = false;

62 static bool sample_address = false;

63 static bool no_buildid = false;

64

65 static long samples = 0;

66 static u64 bytes_written = 0;

67

68 static struct pollfd *event_array;

69

70 static int nr_poll = 0;

71 static int nr_cpu = 0;

72

73 static int file_new = 1;

74 static off_t post_processing_offset;

75

76 static struct perf_session *session;

77 static const char *cpu_list;

78

79 struct mmap_data {

80 int counter;

81 void *base;

82 unsigned int mask;

83 unsigned int prev;

84 };

85

86 static struct mmap_data mmap_array[MAX_NR_CPUS];

87

88 static unsigned long mmap_read_head(struct mmap_data *md)

89 {

90 struct perf_event_mmap_page *pc = md->base;

91 long head;

92

93 head = pc->data_head;

94 rmb();

95

96 return head;

97 }

98

99 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)

100 {

101 struct perf_event_mmap_page *pc = md->base;

102

103 /*

104 * ensure all reads are done before we write the tail out.

105 */

106 /* mb(); */

107 pc->data_tail = tail;

108 }

109

110 static void advance_output(size_t size)

111 {

112 bytes_written += size;

113 }

114

115 static void write_output(void *buf, size_t size)

116 {

117 while (size) {

118 int ret = write(output, buf, size);

119

120 if (ret < 0)

121 die("failed to write");

122

123 size -= ret;

124 buf += ret;

125

126 bytes_written += ret;

127 }

128 }

129

130 static int process_synthesized_event(event_t *event,

131 struct perf_session *self __used)

132 {

133 write_output(event, event->header.size);

134 return 0;

135 }

136

137 static void mmap_read(struct mmap_data *md)

138 {

139 unsigned int head = mmap_read_head(md);

140 unsigned int old = md->prev;

141 unsigned char *data = md->base + page_size;

142 unsigned long size;

143 void *buf;

144 int diff;

145

146 /*

147 * If we're further behind than half the buffer, there's a chance

148 * the writer will bite our tail and mess up the samples under us.

149 *

150 * If we somehow ended up ahead of the head, we got messed up.

151 *

152 * In either case, truncate and restart at head.

153 */

154 diff = head - old;

155 if (diff < 0) {

156 fprintf(stderr, "WARNING: failed to keep up with mmap data\n");

157 /*

158 * head points to a known good entry, start there.

159 */

160 old = head;

161 }

162

163 if (old != head)

164 samples++;

165

166 size = head - old;

167

168 if ((old & md->mask) + size != (head & md->mask)) {

169 buf = &data[old & md->mask];

170 size = md->mask + 1 - (old & md->mask);

171 old += size;

172

173 write_output(buf, size);

174 }

175

176 buf = &data[old & md->mask];

177 size = head - old;

178 old += size;

179

180 write_output(buf, size);

181

182 md->prev = old;

183 mmap_write_tail(md, old);

184 }

185

186 static volatile int done = 0;

187 static volatile int signr = -1;

188

189 static void sig_handler(int sig)

190 {

191 done = 1;

192 signr = sig;

193 }

194

195 static void sig_atexit(void)

196 {

197 if (child_pid > 0)

198 kill(child_pid, SIGTERM);

199

200 if (signr == -1)

201 return;

202

203 signal(signr, SIG_DFL);

204 kill(getpid(), signr);

205 }

206

207 static int group_fd;

208

209 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)

210 {

211 struct perf_header_attr *h_attr;

212

213 if (nr < session->header.attrs) {

214 h_attr = session->header.attr[nr];

215 } else {

216 h_attr = perf_header_attr__new(a);

217 if (h_attr != NULL)

218 if (perf_header__add_attr(&session->header, h_attr) < 0) {

219 perf_header_attr__delete(h_attr);

220 h_attr = NULL;

221 }

222 }

223

224 return h_attr;

225 }

226

227 static void create_counter(int counter, int cpu)

228 {

229 char *filter = filters[counter];

230 struct perf_event_attr *attr = attrs + counter;

231 struct perf_header_attr *h_attr;

232 int track = !counter; /* only the first counter needs these */

233 int thread_index;

234 int ret;

235 struct {

236 u64 count;

237 u64 time_enabled;

238 u64 time_running;

239 u64 id;

240 } read_data;

241

242 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |

243 PERF_FORMAT_TOTAL_TIME_RUNNING |

244 PERF_FORMAT_ID;

245

246 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;

247

248 if (nr_counters > 1)

249 attr->sample_type |= PERF_SAMPLE_ID;

250

251 /*

252 * We default some events to a 1 default interval. But keep

253 * it a weak assumption overridable by the user.

254 */

255 if (!attr->sample_period || (user_freq != UINT_MAX &&

256 user_interval != ULLONG_MAX)) {

257 if (freq) {

258 attr->sample_type |= PERF_SAMPLE_PERIOD;

259 attr->freq = 1;

260 attr->sample_freq = freq;

261 } else {

262 attr->sample_period = default_interval;

263 }

264 }

265

266 if (no_samples)

267 attr->sample_freq = 0;

268

269 if (inherit_stat)

270 attr->inherit_stat = 1;

271

272 if (sample_address) {

273 attr->sample_type |= PERF_SAMPLE_ADDR;

274 attr->mmap_data = track;

275 }

276

277 if (call_graph)

278 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;

279

280 if (system_wide)

281 attr->sample_type |= PERF_SAMPLE_CPU;

282

283 if (raw_samples) {

284 attr->sample_type |= PERF_SAMPLE_TIME;

285 attr->sample_type |= PERF_SAMPLE_RAW;

286 attr->sample_type |= PERF_SAMPLE_CPU;

287 }

288

289 attr->mmap = track;

290 attr->comm = track;

291 attr->inherit = !no_inherit;

292 if (target_pid == -1 && target_tid == -1 && !system_wide) {

293 attr->disabled = 1;

294 attr->enable_on_exec = 1;

295 }

296

297 for (thread_index = 0; thread_index < thread_num; thread_index++) {

298 try_again:

299 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,

300 all_tids[thread_index], cpu, group_fd, 0);

301

302 if (fd[nr_cpu][counter][thread_index] < 0) {

303 int err = errno;

304

305 if (err == EPERM || err == EACCES)

306 die("Permission error - are you root?\n"

307 "\t Consider tweaking"

308 " /proc/sys/kernel/perf_event_paranoid.\n");

309 else if (err == ENODEV && cpu_list) {

310 die("No such device - did you specify"

311 " an out-of-range profile CPU?\n");

312 }

313

314 /*

315 * If it's cycles then fall back to hrtimer

316 * based cpu-clock-tick sw counter, which

317 * is always available even if no PMU support:

318 */

319 if (attr->type == PERF_TYPE_HARDWARE

320 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {

321

322 if (verbose)

323 warning(" ... trying to fall back to cpu-clock-ticks\n");

324 attr->type = PERF_TYPE_SOFTWARE;

325 attr->config = PERF_COUNT_SW_CPU_CLOCK;

326 goto try_again;

327 }

328 printf("\n");

329 error("perfcounter syscall returned with %d (%s)\n",

330 fd[nr_cpu][counter][thread_index], strerror(err));

331

332 #if defined(__i386__) || defined(__x86_64__)

333 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)

334 die("No hardware sampling interrupt available."

335 " No APIC? If so then you can boot the kernel"

336 " with the \"lapic\" boot parameter to"

337 " force-enable it.\n");

338 #endif

339

340 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");

341 exit(-1);

342 }

343

344 h_attr = get_header_attr(attr, counter);

345 if (h_attr == NULL)

346 die("nomem\n");

347

348 if (!file_new) {

349 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {

350 fprintf(stderr, "incompatible append\n");

351 exit(-1);

352 }

353 }

354

355 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {

356 perror("Unable to read perf file descriptor");

357 exit(-1);

358 }

359

360 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {

361 pr_warning("Not enough memory to add id\n");

362 exit(-1);

363 }

364

365 assert(fd[nr_cpu][counter][thread_index] >= 0);

366 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);

367

368 /*

369 * First counter acts as the group leader:

370 */

371 if (group && group_fd == -1)

372 group_fd = fd[nr_cpu][counter][thread_index];

373

374 if (counter || thread_index) {

375 ret = ioctl(fd[nr_cpu][counter][thread_index],

376 PERF_EVENT_IOC_SET_OUTPUT,

377 fd[nr_cpu][0][0]);

378 if (ret) {

379 error("failed to set output: %d (%s)\n", errno,

380 strerror(errno));

381 exit(-1);

382 }

383 } else {

384 mmap_array[nr_cpu].counter = counter;

385 mmap_array[nr_cpu].prev = 0;

386 mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;

387 mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,

388 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);

389 if (mmap_array[nr_cpu].base == MAP_FAILED) {

390 error("failed to mmap with %d (%s)\n", errno, strerror(errno));

391 exit(-1);

392 }

393

394 event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];

395 event_array[nr_poll].events = POLLIN;

396 nr_poll++;

397 }

398

399 if (filter != NULL) {

400 ret = ioctl(fd[nr_cpu][counter][thread_index],

401 PERF_EVENT_IOC_SET_FILTER, filter);

402 if (ret) {

403 error("failed to set filter with %d (%s)\n", errno,

404 strerror(errno));

405 exit(-1);

406 }

407 }

408 }

409 }

410

411 static void open_counters(int cpu)

412 {

413 int counter;

414

415 group_fd = -1;

416 for (counter = 0; counter < nr_counters; counter++)

417 create_counter(counter, cpu);

418

419 nr_cpu++;

420 }

421

422 static int process_buildids(void)

423 {

424 u64 size = lseek(output, 0, SEEK_CUR);

425

426 if (size == 0)

427 return 0;

428

429 session->fd = output;

430 return __perf_session__process_events(session, post_processing_offset,

431 size - post_processing_offset,

432 size, &build_id__mark_dso_hit_ops);

433 }

434

435 static void atexit_header(void)

436 {

437 if (!pipe_output) {

438 session->header.data_size += bytes_written;

439

440 process_buildids();

441 perf_header__write(&session->header, output, true);

442 perf_session__delete(session);

443 symbol__exit();

444 }

445 }

446

447 static void event__synthesize_guest_os(struct machine *machine, void *data)

448 {

449 int err;

450 struct perf_session *psession = data;

451

452 if (machine__is_host(machine))

453 return;

454

455 /*

456 *As for guest kernel when processing subcommand record&report,

457 *we arrange module mmap prior to guest kernel mmap and trigger

458 *a preload dso because default guest module symbols are loaded

459 *from guest kallsyms instead of /lib/modules/XXX/XXX. This

460 *method is used to avoid symbol missing when the first addr is

461 *in module instead of in guest kernel.

462 */

463 err = event__synthesize_modules(process_synthesized_event,

464 psession, machine);

465 if (err < 0)

466 pr_err("Couldn't record guest kernel [%d]'s reference"

467 " relocation symbol.\n", machine->pid);

468

469 /*

470 * We use _stext for guest kernel because guest kernel's /proc/kallsyms

471 * have no _text sometimes.

472 */

473 err = event__synthesize_kernel_mmap(process_synthesized_event,

474 psession, machine, "_text");

475 if (err < 0)

476 err = event__synthesize_kernel_mmap(process_synthesized_event,

477 psession, machine, "_stext");

478 if (err < 0)

479 pr_err("Couldn't record guest kernel [%d]'s reference"

480 " relocation symbol.\n", machine->pid);

481 }

482

483 static struct perf_event_header finished_round_event = {

484 .size = sizeof(struct perf_event_header),

485 .type = PERF_RECORD_FINISHED_ROUND,

486 };

487

488 static void mmap_read_all(void)

489 {

490 int i;

491

492 for (i = 0; i < nr_cpu; i++) {

493 if (mmap_array[i].base)

494 mmap_read(&mmap_array[i]);

495 }

496

497 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))

498 write_output(&finished_round_event, sizeof(finished_round_event));

499 }

500

501 static int __cmd_record(int argc, const char **argv)

502 {

503 int i, counter;

504 struct stat st;

505 int flags;

506 int err;

507 unsigned long waking = 0;

508 int child_ready_pipe[2], go_pipe[2];

509 const bool forks = argc > 0;

510 char buf;

511 struct machine *machine;

512

513 page_size = sysconf(_SC_PAGE_SIZE);

514

515 atexit(sig_atexit);

516 signal(SIGCHLD, sig_handler);

517 signal(SIGINT, sig_handler);

518

519 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {

520 perror("failed to create pipes");

521 exit(-1);

522 }

523

524 if (!strcmp(output_name, "-"))

525 pipe_output = 1;

526 else if (!stat(output_name, &st) && st.st_size) {

527 if (write_mode == WRITE_FORCE) {

528 char oldname[PATH_MAX];

529 snprintf(oldname, sizeof(oldname), "%s.old",

530 output_name);

531 unlink(oldname);

532 rename(output_name, oldname);

533 }

534 } else if (write_mode == WRITE_APPEND) {

535 write_mode = WRITE_FORCE;

536 }

537

538 flags = O_CREAT|O_RDWR;

539 if (write_mode == WRITE_APPEND)

540 file_new = 0;

541 else

542 flags |= O_TRUNC;

543

544 if (pipe_output)

545 output = STDOUT_FILENO;

546 else

547 output = open(output_name, flags, S_IRUSR | S_IWUSR);

548 if (output < 0) {

549 perror("failed to create output file");

550 exit(-1);

551 }

552

553 session = perf_session__new(output_name, O_WRONLY,

554 write_mode == WRITE_FORCE, false);

555 if (session == NULL) {

556 pr_err("Not enough memory for reading perf file header\n");

557 return -1;

558 }

559

560 if (!file_new) {

561 err = perf_header__read(session, output);

562 if (err < 0)

563 goto out_delete_session;

564 }

565

566 if (have_tracepoints(attrs, nr_counters))

567 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);

568

569 /*

570 * perf_session__delete(session) will be called at atexit_header()

571 */

572 atexit(atexit_header);

573

574 if (forks) {

575 child_pid = fork();

576 if (child_pid < 0) {

577 perror("failed to fork");

578 exit(-1);

579 }

580

581 if (!child_pid) {

582 if (pipe_output)

583 dup2(2, 1);

584 close(child_ready_pipe[0]);

585 close(go_pipe[1]);

586 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);

587

588 /*

589 * Do a dummy execvp to get the PLT entry resolved,

590 * so we avoid the resolver overhead on the real

591 * execvp call.

592 */

593 execvp("", (char **)argv);

594

595 /*

596 * Tell the parent we're ready to go

597 */

598 close(child_ready_pipe[1]);

599

600 /*

601 * Wait until the parent tells us to go.

602 */

603 if (read(go_pipe[0], &buf, 1) == -1)

604 perror("unable to read pipe");

605

606 execvp(argv[0], (char **)argv);

607

608 perror(argv[0]);

609 exit(-1);

610 }

611

612 if (!system_wide && target_tid == -1 && target_pid == -1)

613 all_tids[0] = child_pid;

614

615 close(child_ready_pipe[1]);

616 close(go_pipe[0]);

617 /*

618 * wait for child to settle

619 */

620 if (read(child_ready_pipe[0], &buf, 1) == -1) {

621 perror("unable to read pipe");

622 exit(-1);

623 }

624 close(child_ready_pipe[0]);

625 }

626

627 nr_cpus = read_cpu_map(cpu_list);

628 if (nr_cpus < 1) {

629 perror("failed to collect number of CPUs");

630 return -1;

631 }

632

633 if (!system_wide && no_inherit && !cpu_list) {

634 open_counters(-1);

635 } else {

636 for (i = 0; i < nr_cpus; i++)

637 open_counters(cpumap[i]);

638 }

639

640 if (pipe_output) {

641 err = perf_header__write_pipe(output);

642 if (err < 0)

643 return err;

644 } else if (file_new) {

645 err = perf_header__write(&session->header, output, false);

646 if (err < 0)

647 return err;

648 }

649

650 post_processing_offset = lseek(output, 0, SEEK_CUR);

651

652 if (pipe_output) {

653 err = event__synthesize_attrs(&session->header,

654 process_synthesized_event,

655 session);

656 if (err < 0) {

657 pr_err("Couldn't synthesize attrs.\n");

658 return err;

659 }

660

661 err = event__synthesize_event_types(process_synthesized_event,

662 session);

663 if (err < 0) {

664 pr_err("Couldn't synthesize event_types.\n");

665 return err;

666 }

667

668 if (have_tracepoints(attrs, nr_counters)) {

669 /*

670 * FIXME err <= 0 here actually means that

671 * there were no tracepoints so its not really

672 * an error, just that we don't need to

673 * synthesize anything. We really have to

674 * return this more properly and also

675 * propagate errors that now are calling die()

676 */

677 err = event__synthesize_tracing_data(output, attrs,

678 nr_counters,

679 process_synthesized_event,

680 session);

681 if (err <= 0) {

682 pr_err("Couldn't record tracing data.\n");

683 return err;

684 }

685 advance_output(err);

686 }

687 }

688

689 machine = perf_session__find_host_machine(session);

690 if (!machine) {

691 pr_err("Couldn't find native kernel information.\n");

692 return -1;

693 }

694

695 err = event__synthesize_kernel_mmap(process_synthesized_event,

696 session, machine, "_text");

697 if (err < 0)

698 err = event__synthesize_kernel_mmap(process_synthesized_event,

699 session, machine, "_stext");

700 if (err < 0)

701 pr_err("Couldn't record kernel reference relocation symbol\n"

702 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"

703 "Check /proc/kallsyms permission or run as root.\n");

704

705 err = event__synthesize_modules(process_synthesized_event,

706 session, machine);

707 if (err < 0)

708 pr_err("Couldn't record kernel module information.\n"

709 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"

710 "Check /proc/modules permission or run as root.\n");

711

712 if (perf_guest)

713 perf_session__process_machines(session, event__synthesize_guest_os);

714

715 if (!system_wide)

716 event__synthesize_thread(target_tid, process_synthesized_event,

717 session);

718 else

719 event__synthesize_threads(process_synthesized_event, session);

720

721 if (realtime_prio) {

722 struct sched_param param;

723

724 param.sched_priority = realtime_prio;

725 if (sched_setscheduler(0, SCHED_FIFO, &param)) {

726 pr_err("Could not set realtime priority.\n");

727 exit(-1);

728 }

729 }

730

731 /*

732 * Let the child rip

733 */

734 if (forks)

735 close(go_pipe[1]);

736

737 for (;;) {

738 int hits = samples;

739 int thread;

740

741 mmap_read_all();

742

743 if (hits == samples) {

744 if (done)

745 break;

746 err = poll(event_array, nr_poll, -1);

747 waking++;

748 }

749

750 if (done) {

751 for (i = 0; i < nr_cpu; i++) {

752 for (counter = 0;

753 counter < nr_counters;

754 counter++) {

755 for (thread = 0;

756 thread < thread_num;

757 thread++)

758 ioctl(fd[i][counter][thread],

759 PERF_EVENT_IOC_DISABLE);

760 }

761 }

762 }

763 }

764

765 if (quiet)

766 return 0;

767

768 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);

769

770 /*

771 * Approximate RIP event size: 24 bytes.

772 */

773 fprintf(stderr,

774 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",

775 (double)bytes_written / 1024.0 / 1024.0,

776 output_name,

777 bytes_written / 24);

778

779 return 0;

780

781 out_delete_session:

782 perf_session__delete(session);

783 return err;

784 }

785

786 static const char * const record_usage[] = {

787 "perf record [<options>] [<command>]",

788 "perf record [<options>] -- <command> [<options>]",

789 NULL

790 };

791

792 static bool force, append_file;

793

794 const struct option record_options[] = {

795 OPT_CALLBACK('e', "event", NULL, "event",

796 "event selector. use 'perf list' to list available events",

797 parse_events),

798 OPT_CALLBACK(0, "filter", NULL, "filter",

799 "event filter", parse_filter),

800 OPT_INTEGER('p', "pid", &target_pid,

801 "record events on existing process id"),

802 OPT_INTEGER('t', "tid", &target_tid,

803 "record events on existing thread id"),

804 OPT_INTEGER('r', "realtime", &realtime_prio,

805 "collect data with this RT SCHED_FIFO priority"),

806 OPT_BOOLEAN('R', "raw-samples", &raw_samples,

807 "collect raw sample records from all opened counters"),

808 OPT_BOOLEAN('a', "all-cpus", &system_wide,

809 "system-wide collection from all CPUs"),

810 OPT_BOOLEAN('A', "append", &append_file,

811 "append to the output file to do incremental profiling"),

812 OPT_STRING('C', "cpu", &cpu_list, "cpu",

813 "list of cpus to monitor"),

814 OPT_BOOLEAN('f', "force", &force,

815 "overwrite existing data file (deprecated)"),

816 OPT_U64('c', "count", &user_interval, "event period to sample"),

817 OPT_STRING('o', "output", &output_name, "file",

818 "output file name"),

819 OPT_BOOLEAN('i', "no-inherit", &no_inherit,

820 "child tasks do not inherit counters"),

821 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),

822 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),

823 OPT_BOOLEAN('g', "call-graph", &call_graph,

824 "do call-graph (stack chain/backtrace) recording"),

825 OPT_INCR('v', "verbose", &verbose,

826 "be more verbose (show counter open errors, etc)"),

827 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),

828 OPT_BOOLEAN('s', "stat", &inherit_stat,

829 "per thread counts"),

830 OPT_BOOLEAN('d', "data", &sample_address,

831 "Sample addresses"),

832 OPT_BOOLEAN('n', "no-samples", &no_samples,

833 "don't sample"),

834 OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid,

835 "do not update the buildid cache"),

836 OPT_END()

837 };

838

839 int cmd_record(int argc, const char **argv, const char *prefix __used)

840 {

841 int i, j, err = -ENOMEM;

842

843 argc = parse_options(argc, argv, record_options, record_usage,

844 PARSE_OPT_STOP_AT_NON_OPTION);

845 if (!argc && target_pid == -1 && target_tid == -1 &&

846 !system_wide && !cpu_list)

847 usage_with_options(record_usage, record_options);

848

849 if (force && append_file) {

850 fprintf(stderr, "Can't overwrite and append at the same time."

851 " You need to choose between -f and -A");

852 usage_with_options(record_usage, record_options);

853 } else if (append_file) {

854 write_mode = WRITE_APPEND;

855 } else {

856 write_mode = WRITE_FORCE;

857 }

858

859 symbol__init();

860 if (no_buildid)

861 disable_buildid_cache();

862

863 if (!nr_counters) {

864 nr_counters = 1;

865 attrs[0].type = PERF_TYPE_HARDWARE;

866 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;

867 }

868

869 if (target_pid != -1) {

870 target_tid = target_pid;

871 thread_num = find_all_tid(target_pid, &all_tids);

872 if (thread_num <= 0) {

873 fprintf(stderr, "Can't find all threads of pid %d\n",

874 target_pid);

875 usage_with_options(record_usage, record_options);

876 }

877 } else {

878 all_tids=malloc(sizeof(pid_t));

879 if (!all_tids)

880 goto out_symbol_exit;

881

882 all_tids[0] = target_tid;

883 thread_num = 1;

884 }

885

886 for (i = 0; i < MAX_NR_CPUS; i++) {

887 for (j = 0; j < MAX_COUNTERS; j++) {

888 fd[i][j] = malloc(sizeof(int)*thread_num);

889 if (!fd[i][j])

890 goto out_free_fd;

891 }

892 }

893 event_array = malloc(

894 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);

895 if (!event_array)

896 goto out_free_fd;

897

898 if (user_interval != ULLONG_MAX)

899 default_interval = user_interval;

900 if (user_freq != UINT_MAX)

901 freq = user_freq;

902

903 /*

904 * User specified count overrides default frequency.

905 */

906 if (default_interval)

907 freq = 0;

908 else if (freq) {

909 default_interval = freq;

910 } else {

911 fprintf(stderr, "frequency and count are zero, aborting\n");

912 err = -EINVAL;

913 goto out_free_event_array;

914 }

915

916 err = __cmd_record(argc, argv);

917

918 out_free_event_array:

919 free(event_array);

920 out_free_fd:

921 for (i = 0; i < MAX_NR_CPUS; i++) {

922 for (j = 0; j < MAX_COUNTERS; j++)

923 free(fd[i][j]);

924 }

925 free(all_tids);

926 all_tids = NULL;

927 out_symbol_exit:

928 symbol__exit();

929 return err;

930 }