tools/perf/builtin-ftrace.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * builtin-ftrace.c
   4  *
   5  * Copyright (c) 2013  LG Electronics,  Namhyung Kim <namhyung@kernel.org>
   6  */
   7
   8 #include "builtin.h"
   9
  10 #include <errno.h>
  11 #include <unistd.h>
  12 #include <signal.h>
  13 #include <stdlib.h>
  14 #include <fcntl.h>
  15 #include <poll.h>
  16 #include <linux/capability.h>
  17 #include <linux/string.h>
  18
  19 #include "debug.h"
  20 #include <subcmd/pager.h>
  21 #include <subcmd/parse-options.h>
  22 #include <api/fs/tracing_path.h>
  23 #include "evlist.h"
  24 #include "target.h"
  25 #include "cpumap.h"
  26 #include "thread_map.h"
  27 #include "util/cap.h"
  28 #include "util/config.h"
  29 #include "util/units.h"
  30 #include "util/parse-sublevel-options.h"
  31
  32 #define DEFAULT_TRACER  "function_graph"
  33
  34 struct perf_ftrace {
  35         struct evlist           *evlist;
  36         struct target           target;
  37         const char              *tracer;
  38         bool                    list_avail_functions;
  39         struct list_head        filters;
  40         struct list_head        notrace;
  41         struct list_head        graph_funcs;
  42         struct list_head        nograph_funcs;
  43         int                     graph_depth;
  44         unsigned long           percpu_buffer_size;
  45         bool                    inherit;
  46         int                     func_stack_trace;
  47 };
  48
  49 struct filter_entry {
  50         struct list_head        list;
  51         char                    name[];
  52 };
  53
  54 static volatile int workload_exec_errno;
  55 static bool done;
  56
  57 static void sig_handler(int sig __maybe_unused)
  58 {
  59         done = true;
  60 }
  61
  62 /*
  63  * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
  64  * we asked by setting its exec_error to the function below,
  65  * ftrace__workload_exec_failed_signal.
  66  *
  67  * XXX We need to handle this more appropriately, emitting an error, etc.
  68  */
  69 static void ftrace__workload_exec_failed_signal(int signo __maybe_unused,
  70                                                 siginfo_t *info __maybe_unused,
  71                                                 void *ucontext __maybe_unused)
  72 {
  73         workload_exec_errno = info->si_value.sival_int;
  74         done = true;
  75 }
  76
  77 static int __write_tracing_file(const char *name, const char *val, bool append)
  78 {
  79         char *file;
  80         int fd, ret = -1;
  81         ssize_t size = strlen(val);
  82         int flags = O_WRONLY;
  83         char errbuf[512];
  84         char *val_copy;
  85
  86         file = get_tracing_file(name);
  87         if (!file) {
  88                 pr_debug("cannot get tracing file: %s\n", name);
  89                 return -1;
  90         }
  91
  92         if (append)
  93                 flags |= O_APPEND;
  94         else
  95                 flags |= O_TRUNC;
  96
  97         fd = open(file, flags);
  98         if (fd < 0) {
  99                 pr_debug("cannot open tracing file: %s: %s\n",
 100                          name, str_error_r(errno, errbuf, sizeof(errbuf)));
 101                 goto out;
 102         }
 103
 104         /*
 105          * Copy the original value and append a '\n'. Without this,
 106          * the kernel can hide possible errors.
 107          */
 108         val_copy = strdup(val);
 109         if (!val_copy)
 110                 goto out_close;
 111         val_copy[size] = '\n';
 112
 113         if (write(fd, val_copy, size + 1) == size + 1)
 114                 ret = 0;
 115         else
 116                 pr_debug("write '%s' to tracing/%s failed: %s\n",
 117                          val, name, str_error_r(errno, errbuf, sizeof(errbuf)));
 118
 119         free(val_copy);
 120 out_close:
 121         close(fd);
 122 out:
 123         put_tracing_file(file);
 124         return ret;
 125 }
 126
 127 static int write_tracing_file(const char *name, const char *val)
 128 {
 129         return __write_tracing_file(name, val, false);
 130 }
 131
 132 static int append_tracing_file(const char *name, const char *val)
 133 {
 134         return __write_tracing_file(name, val, true);
 135 }
 136
 137 static int read_tracing_file_to_stdout(const char *name)
 138 {
 139         char buf[4096];
 140         char *file;
 141         int fd;
 142         int ret = -1;
 143
 144         file = get_tracing_file(name);
 145         if (!file) {
 146                 pr_debug("cannot get tracing file: %s\n", name);
 147                 return -1;
 148         }
 149
 150         fd = open(file, O_RDONLY);
 151         if (fd < 0) {
 152                 pr_debug("cannot open tracing file: %s: %s\n",
 153                          name, str_error_r(errno, buf, sizeof(buf)));
 154                 goto out;
 155         }
 156
 157         /* read contents to stdout */
 158         while (true) {
 159                 int n = read(fd, buf, sizeof(buf));
 160                 if (n == 0)
 161                         break;
 162                 else if (n < 0)
 163                         goto out_close;
 164
 165                 if (fwrite(buf, n, 1, stdout) != 1)
 166                         goto out_close;
 167         }
 168         ret = 0;
 169
 170 out_close:
 171         close(fd);
 172 out:
 173         put_tracing_file(file);
 174         return ret;
 175 }
 176
 177 static int write_tracing_file_int(const char *name, int value)
 178 {
 179         char buf[16];
 180
 181         snprintf(buf, sizeof(buf), "%d", value);
 182         if (write_tracing_file(name, buf) < 0)
 183                 return -1;
 184
 185         return 0;
 186 }
 187
 188 static int write_tracing_option_file(const char *name, const char *val)
 189 {
 190         char *file;
 191         int ret;
 192
 193         if (asprintf(&file, "options/%s", name) < 0)
 194                 return -1;
 195
 196         ret = __write_tracing_file(file, val, false);
 197         free(file);
 198         return ret;
 199 }
 200
 201 static int reset_tracing_cpu(void);
 202 static void reset_tracing_filters(void);
 203
 204 static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
 205 {
 206         write_tracing_option_file("function-fork", "0");
 207         write_tracing_option_file("func_stack_trace", "0");
 208 }
 209
 210 static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
 211 {
 212         if (write_tracing_file("tracing_on", "0") < 0)
 213                 return -1;
 214
 215         if (write_tracing_file("current_tracer", "nop") < 0)
 216                 return -1;
 217
 218         if (write_tracing_file("set_ftrace_pid", " ") < 0)
 219                 return -1;
 220
 221         if (reset_tracing_cpu() < 0)
 222                 return -1;
 223
 224         if (write_tracing_file("max_graph_depth", "0") < 0)
 225                 return -1;
 226
 227         reset_tracing_filters();
 228         reset_tracing_options(ftrace);
 229         return 0;
 230 }
 231
 232 static int set_tracing_pid(struct perf_ftrace *ftrace)
 233 {
 234         int i;
 235         char buf[16];
 236
 237         if (target__has_cpu(&ftrace->target))
 238                 return 0;
 239
 240         for (i = 0; i < perf_thread_map__nr(ftrace->evlist->core.threads); i++) {
 241                 scnprintf(buf, sizeof(buf), "%d",
 242                           ftrace->evlist->core.threads->map[i]);
 243                 if (append_tracing_file("set_ftrace_pid", buf) < 0)
 244                         return -1;
 245         }
 246         return 0;
 247 }
 248
 249 static int set_tracing_cpumask(struct perf_cpu_map *cpumap)
 250 {
 251         char *cpumask;
 252         size_t mask_size;
 253         int ret;
 254         int last_cpu;
 255
 256         last_cpu = cpu_map__cpu(cpumap, cpumap->nr - 1);
 257         mask_size = last_cpu / 4 + 2; /* one more byte for EOS */
 258         mask_size += last_cpu / 32; /* ',' is needed for every 32th cpus */
 259
 260         cpumask = malloc(mask_size);
 261         if (cpumask == NULL) {
 262                 pr_debug("failed to allocate cpu mask\n");
 263                 return -1;
 264         }
 265
 266         cpu_map__snprint_mask(cpumap, cpumask, mask_size);
 267
 268         ret = write_tracing_file("tracing_cpumask", cpumask);
 269
 270         free(cpumask);
 271         return ret;
 272 }
 273
 274 static int set_tracing_cpu(struct perf_ftrace *ftrace)
 275 {
 276         struct perf_cpu_map *cpumap = ftrace->evlist->core.cpus;
 277
 278         if (!target__has_cpu(&ftrace->target))
 279                 return 0;
 280
 281         return set_tracing_cpumask(cpumap);
 282 }
 283
 284 static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace)
 285 {
 286         if (!ftrace->func_stack_trace)
 287                 return 0;
 288
 289         if (write_tracing_option_file("func_stack_trace", "1") < 0)
 290                 return -1;
 291
 292         return 0;
 293 }
 294
 295 static int reset_tracing_cpu(void)
 296 {
 297         struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL);
 298         int ret;
 299
 300         ret = set_tracing_cpumask(cpumap);
 301         perf_cpu_map__put(cpumap);
 302         return ret;
 303 }
 304
 305 static int __set_tracing_filter(const char *filter_file, struct list_head *funcs)
 306 {
 307         struct filter_entry *pos;
 308
 309         list_for_each_entry(pos, funcs, list) {
 310                 if (append_tracing_file(filter_file, pos->name) < 0)
 311                         return -1;
 312         }
 313
 314         return 0;
 315 }
 316
 317 static int set_tracing_filters(struct perf_ftrace *ftrace)
 318 {
 319         int ret;
 320
 321         ret = __set_tracing_filter("set_ftrace_filter", &ftrace->filters);
 322         if (ret < 0)
 323                 return ret;
 324
 325         ret = __set_tracing_filter("set_ftrace_notrace", &ftrace->notrace);
 326         if (ret < 0)
 327                 return ret;
 328
 329         ret = __set_tracing_filter("set_graph_function", &ftrace->graph_funcs);
 330         if (ret < 0)
 331                 return ret;
 332
 333         /* old kernels do not have this filter */
 334         __set_tracing_filter("set_graph_notrace", &ftrace->nograph_funcs);
 335
 336         return ret;
 337 }
 338
 339 static void reset_tracing_filters(void)
 340 {
 341         write_tracing_file("set_ftrace_filter", " ");
 342         write_tracing_file("set_ftrace_notrace", " ");
 343         write_tracing_file("set_graph_function", " ");
 344         write_tracing_file("set_graph_notrace", " ");
 345 }
 346
 347 static int set_tracing_depth(struct perf_ftrace *ftrace)
 348 {
 349         if (ftrace->graph_depth == 0)
 350                 return 0;
 351
 352         if (ftrace->graph_depth < 0) {
 353                 pr_err("invalid graph depth: %d\n", ftrace->graph_depth);
 354                 return -1;
 355         }
 356
 357         if (write_tracing_file_int("max_graph_depth", ftrace->graph_depth) < 0)
 358                 return -1;
 359
 360         return 0;
 361 }
 362
 363 static int set_tracing_percpu_buffer_size(struct perf_ftrace *ftrace)
 364 {
 365         int ret;
 366
 367         if (ftrace->percpu_buffer_size == 0)
 368                 return 0;
 369
 370         ret = write_tracing_file_int("buffer_size_kb",
 371                                      ftrace->percpu_buffer_size / 1024);
 372         if (ret < 0)
 373                 return ret;
 374
 375         return 0;
 376 }
 377
 378 static int set_tracing_trace_inherit(struct perf_ftrace *ftrace)
 379 {
 380         if (!ftrace->inherit)
 381                 return 0;
 382
 383         if (write_tracing_option_file("function-fork", "1") < 0)
 384                 return -1;
 385
 386         return 0;
 387 }
 388
 389 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 390 {
 391         char *trace_file;
 392         int trace_fd;
 393         char buf[4096];
 394         struct pollfd pollfd = {
 395                 .events = POLLIN,
 396         };
 397
 398         if (!(perf_cap__capable(CAP_PERFMON) ||
 399               perf_cap__capable(CAP_SYS_ADMIN))) {
 400                 pr_err("ftrace only works for %s!\n",
 401 #ifdef HAVE_LIBCAP_SUPPORT
 402                 "users with the CAP_PERFMON or CAP_SYS_ADMIN capability"
 403 #else
 404                 "root"
 405 #endif
 406                 );
 407                 return -1;
 408         }
 409
 410         signal(SIGINT, sig_handler);
 411         signal(SIGUSR1, sig_handler);
 412         signal(SIGCHLD, sig_handler);
 413         signal(SIGPIPE, sig_handler);
 414
 415         if (ftrace->list_avail_functions)
 416                 return read_tracing_file_to_stdout("available_filter_functions");
 417
 418         if (reset_tracing_files(ftrace) < 0) {
 419                 pr_err("failed to reset ftrace\n");
 420                 goto out;
 421         }
 422
 423         /* reset ftrace buffer */
 424         if (write_tracing_file("trace", "0") < 0)
 425                 goto out;
 426
 427         if (argc && perf_evlist__prepare_workload(ftrace->evlist,
 428                                 &ftrace->target, argv, false,
 429                                 ftrace__workload_exec_failed_signal) < 0) {
 430                 goto out;
 431         }
 432
 433         if (set_tracing_pid(ftrace) < 0) {
 434                 pr_err("failed to set ftrace pid\n");
 435                 goto out_reset;
 436         }
 437
 438         if (set_tracing_cpu(ftrace) < 0) {
 439                 pr_err("failed to set tracing cpumask\n");
 440                 goto out_reset;
 441         }
 442
 443         if (set_tracing_func_stack_trace(ftrace) < 0) {
 444                 pr_err("failed to set tracing option func_stack_trace\n");
 445                 goto out_reset;
 446         }
 447
 448         if (set_tracing_filters(ftrace) < 0) {
 449                 pr_err("failed to set tracing filters\n");
 450                 goto out_reset;
 451         }
 452
 453         if (set_tracing_depth(ftrace) < 0) {
 454                 pr_err("failed to set graph depth\n");
 455                 goto out_reset;
 456         }
 457
 458         if (set_tracing_percpu_buffer_size(ftrace) < 0) {
 459                 pr_err("failed to set tracing per-cpu buffer size\n");
 460                 goto out_reset;
 461         }
 462
 463         if (set_tracing_trace_inherit(ftrace) < 0) {
 464                 pr_err("failed to set tracing option function-fork\n");
 465                 goto out_reset;
 466         }
 467
 468         if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
 469                 pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
 470                 goto out_reset;
 471         }
 472
 473         setup_pager();
 474
 475         trace_file = get_tracing_file("trace_pipe");
 476         if (!trace_file) {
 477                 pr_err("failed to open trace_pipe\n");
 478                 goto out_reset;
 479         }
 480
 481         trace_fd = open(trace_file, O_RDONLY);
 482
 483         put_tracing_file(trace_file);
 484
 485         if (trace_fd < 0) {
 486                 pr_err("failed to open trace_pipe\n");
 487                 goto out_reset;
 488         }
 489
 490         fcntl(trace_fd, F_SETFL, O_NONBLOCK);
 491         pollfd.fd = trace_fd;
 492
 493         /* display column headers */
 494         read_tracing_file_to_stdout("trace");
 495
 496         if (write_tracing_file("tracing_on", "1") < 0) {
 497                 pr_err("can't enable tracing\n");
 498                 goto out_close_fd;
 499         }
 500
 501         perf_evlist__start_workload(ftrace->evlist);
 502
 503         while (!done) {
 504                 if (poll(&pollfd, 1, -1) < 0)
 505                         break;
 506
 507                 if (pollfd.revents & POLLIN) {
 508                         int n = read(trace_fd, buf, sizeof(buf));
 509                         if (n < 0)
 510                                 break;
 511                         if (fwrite(buf, n, 1, stdout) != 1)
 512                                 break;
 513                 }
 514         }
 515
 516         write_tracing_file("tracing_on", "0");
 517
 518         if (workload_exec_errno) {
 519                 const char *emsg = str_error_r(workload_exec_errno, buf, sizeof(buf));
 520                 /* flush stdout first so below error msg appears at the end. */
 521                 fflush(stdout);
 522                 pr_err("workload failed: %s\n", emsg);
 523                 goto out_close_fd;
 524         }
 525
 526         /* read remaining buffer contents */
 527         while (true) {
 528                 int n = read(trace_fd, buf, sizeof(buf));
 529                 if (n <= 0)
 530                         break;
 531                 if (fwrite(buf, n, 1, stdout) != 1)
 532                         break;
 533         }
 534
 535 out_close_fd:
 536         close(trace_fd);
 537 out_reset:
 538         reset_tracing_files(ftrace);
 539 out:
 540         return (done && !workload_exec_errno) ? 0 : -1;
 541 }
 542
 543 static int perf_ftrace_config(const char *var, const char *value, void *cb)
 544 {
 545         struct perf_ftrace *ftrace = cb;
 546
 547         if (!strstarts(var, "ftrace."))
 548                 return 0;
 549
 550         if (strcmp(var, "ftrace.tracer"))
 551                 return -1;
 552
 553         if (!strcmp(value, "function_graph") ||
 554             !strcmp(value, "function")) {
 555                 ftrace->tracer = value;
 556                 return 0;
 557         }
 558
 559         pr_err("Please select \"function_graph\" (default) or \"function\"\n");
 560         return -1;
 561 }
 562
 563 static int parse_filter_func(const struct option *opt, const char *str,
 564                              int unset __maybe_unused)
 565 {
 566         struct list_head *head = opt->value;
 567         struct filter_entry *entry;
 568
 569         entry = malloc(sizeof(*entry) + strlen(str) + 1);
 570         if (entry == NULL)
 571                 return -ENOMEM;
 572
 573         strcpy(entry->name, str);
 574         list_add_tail(&entry->list, head);
 575
 576         return 0;
 577 }
 578
 579 static void delete_filter_func(struct list_head *head)
 580 {
 581         struct filter_entry *pos, *tmp;
 582
 583         list_for_each_entry_safe(pos, tmp, head, list) {
 584                 list_del_init(&pos->list);
 585                 free(pos);
 586         }
 587 }
 588
 589 static int parse_buffer_size(const struct option *opt,
 590                              const char *str, int unset)
 591 {
 592         unsigned long *s = (unsigned long *)opt->value;
 593         static struct parse_tag tags_size[] = {
 594                 { .tag  = 'B', .mult = 1       },
 595                 { .tag  = 'K', .mult = 1 << 10 },
 596                 { .tag  = 'M', .mult = 1 << 20 },
 597                 { .tag  = 'G', .mult = 1 << 30 },
 598                 { .tag  = 0 },
 599         };
 600         unsigned long val;
 601
 602         if (unset) {
 603                 *s = 0;
 604                 return 0;
 605         }
 606
 607         val = parse_tag_value(str, tags_size);
 608         if (val != (unsigned long) -1) {
 609                 if (val < 1024) {
 610                         pr_err("buffer size too small, must larger than 1KB.");
 611                         return -1;
 612                 }
 613                 *s = val;
 614                 return 0;
 615         }
 616
 617         return -1;
 618 }
 619
 620 static int parse_func_tracer_opts(const struct option *opt,
 621                                   const char *str, int unset)
 622 {
 623         int ret;
 624         struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value;
 625         struct sublevel_option func_tracer_opts[] = {
 626                 { .name = "call-graph", .value_ptr = &ftrace->func_stack_trace },
 627                 { .name = NULL, }
 628         };
 629
 630         if (unset)
 631                 return 0;
 632
 633         ret = perf_parse_sublevel_options(str, func_tracer_opts);
 634         if (ret)
 635                 return ret;
 636
 637         return 0;
 638 }
 639
 640 static void select_tracer(struct perf_ftrace *ftrace)
 641 {
 642         bool graph = !list_empty(&ftrace->graph_funcs) ||
 643                      !list_empty(&ftrace->nograph_funcs);
 644         bool func = !list_empty(&ftrace->filters) ||
 645                     !list_empty(&ftrace->notrace);
 646
 647         /* The function_graph has priority over function tracer. */
 648         if (graph)
 649                 ftrace->tracer = "function_graph";
 650         else if (func)
 651                 ftrace->tracer = "function";
 652         /* Otherwise, the default tracer is used. */
 653
 654         pr_debug("%s tracer is used\n", ftrace->tracer);
 655 }
 656
 657 int cmd_ftrace(int argc, const char **argv)
 658 {
 659         int ret;
 660         struct perf_ftrace ftrace = {
 661                 .tracer = DEFAULT_TRACER,
 662                 .target = { .uid = UINT_MAX, },
 663         };
 664         const char * const ftrace_usage[] = {
 665                 "perf ftrace [<options>] [<command>]",
 666                 "perf ftrace [<options>] -- <command> [<options>]",
 667                 NULL
 668         };
 669         const struct option ftrace_options[] = {
 670         OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
 671                    "tracer to use: function_graph(default) or function"),
 672         OPT_BOOLEAN('F', "funcs", &ftrace.list_avail_functions,
 673                     "Show available functions to filter"),
 674         OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
 675                    "trace on existing process id"),
 676         OPT_INCR('v', "verbose", &verbose,
 677                  "be more verbose"),
 678         OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
 679                     "system-wide collection from all CPUs"),
 680         OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",
 681                     "list of cpus to monitor"),
 682         OPT_CALLBACK('T', "trace-funcs", &ftrace.filters, "func",
 683                      "trace given functions using function tracer",
 684                      parse_filter_func),
 685         OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func",
 686                      "do not trace given functions", parse_filter_func),
 687         OPT_CALLBACK(0, "func-opts", &ftrace, "options",
 688                      "function tracer options, available options: call-graph",
 689                      parse_func_tracer_opts),
 690         OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
 691                      "trace given functions using function_graph tracer",
 692                      parse_filter_func),
 693         OPT_CALLBACK('g', "nograph-funcs", &ftrace.nograph_funcs, "func",
 694                      "Set nograph filter on given functions", parse_filter_func),
 695         OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
 696                     "Max depth for function graph tracer"),
 697         OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
 698                      "size of per cpu buffer", parse_buffer_size),
 699         OPT_BOOLEAN(0, "inherit", &ftrace.inherit,
 700                     "trace children processes"),
 701         OPT_END()
 702         };
 703
 704         INIT_LIST_HEAD(&ftrace.filters);
 705         INIT_LIST_HEAD(&ftrace.notrace);
 706         INIT_LIST_HEAD(&ftrace.graph_funcs);
 707         INIT_LIST_HEAD(&ftrace.nograph_funcs);
 708
 709         ret = perf_config(perf_ftrace_config, &ftrace);
 710         if (ret < 0)
 711                 return -1;
 712
 713         argc = parse_options(argc, argv, ftrace_options, ftrace_usage,
 714                             PARSE_OPT_STOP_AT_NON_OPTION);
 715         if (!argc && target__none(&ftrace.target))
 716                 ftrace.target.system_wide = true;
 717
 718         select_tracer(&ftrace);
 719
 720         ret = target__validate(&ftrace.target);
 721         if (ret) {
 722                 char errbuf[512];
 723
 724                 target__strerror(&ftrace.target, ret, errbuf, 512);
 725                 pr_err("%s\n", errbuf);
 726                 goto out_delete_filters;
 727         }
 728
 729         ftrace.evlist = evlist__new();
 730         if (ftrace.evlist == NULL) {
 731                 ret = -ENOMEM;
 732                 goto out_delete_filters;
 733         }
 734
 735         ret = perf_evlist__create_maps(ftrace.evlist, &ftrace.target);
 736         if (ret < 0)
 737                 goto out_delete_evlist;
 738
 739         ret = __cmd_ftrace(&ftrace, argc, argv);
 740
 741 out_delete_evlist:
 742         evlist__delete(ftrace.evlist);
 743
 744 out_delete_filters:
 745         delete_filter_func(&ftrace.filters);
 746         delete_filter_func(&ftrace.notrace);
 747         delete_filter_func(&ftrace.graph_funcs);
 748         delete_filter_func(&ftrace.nograph_funcs);
 749
 750         return ret;
 751 }