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TOMOYO Linux Cross Reference
Linux/tools/perf/builtin-top.c

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  1 /*
  2  * builtin-top.c
  3  *
  4  * Builtin top command: Display a continuously updated profile of
  5  * any workload, CPU or specific PID.
  6  *
  7  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  8  *               2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
  9  *
 10  * Improvements and fixes by:
 11  *
 12  *   Arjan van de Ven <arjan@linux.intel.com>
 13  *   Yanmin Zhang <yanmin.zhang@intel.com>
 14  *   Wu Fengguang <fengguang.wu@intel.com>
 15  *   Mike Galbraith <efault@gmx.de>
 16  *   Paul Mackerras <paulus@samba.org>
 17  *
 18  * Released under the GPL v2. (and only v2, not any later version)
 19  */
 20 #include "builtin.h"
 21 
 22 #include "perf.h"
 23 
 24 #include "util/annotate.h"
 25 #include "util/config.h"
 26 #include "util/color.h"
 27 #include "util/drv_configs.h"
 28 #include "util/evlist.h"
 29 #include "util/evsel.h"
 30 #include "util/event.h"
 31 #include "util/machine.h"
 32 #include "util/session.h"
 33 #include "util/symbol.h"
 34 #include "util/thread.h"
 35 #include "util/thread_map.h"
 36 #include "util/top.h"
 37 #include <linux/rbtree.h>
 38 #include <subcmd/parse-options.h>
 39 #include "util/parse-events.h"
 40 #include "util/cpumap.h"
 41 #include "util/xyarray.h"
 42 #include "util/sort.h"
 43 #include "util/term.h"
 44 #include "util/intlist.h"
 45 #include "util/parse-branch-options.h"
 46 #include "arch/common.h"
 47 
 48 #include "util/debug.h"
 49 
 50 #include <assert.h>
 51 #include <elf.h>
 52 #include <fcntl.h>
 53 
 54 #include <stdio.h>
 55 #include <termios.h>
 56 #include <unistd.h>
 57 #include <inttypes.h>
 58 
 59 #include <errno.h>
 60 #include <time.h>
 61 #include <sched.h>
 62 #include <signal.h>
 63 
 64 #include <sys/syscall.h>
 65 #include <sys/ioctl.h>
 66 #include <poll.h>
 67 #include <sys/prctl.h>
 68 #include <sys/wait.h>
 69 #include <sys/uio.h>
 70 #include <sys/utsname.h>
 71 #include <sys/mman.h>
 72 
 73 #include <linux/stringify.h>
 74 #include <linux/time64.h>
 75 #include <linux/types.h>
 76 
 77 #include "sane_ctype.h"
 78 
 79 static volatile int done;
 80 static volatile int resize;
 81 
 82 #define HEADER_LINE_NR  5
 83 
 84 static void perf_top__update_print_entries(struct perf_top *top)
 85 {
 86         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
 87 }
 88 
 89 static void winch_sig(int sig __maybe_unused)
 90 {
 91         resize = 1;
 92 }
 93 
 94 static void perf_top__resize(struct perf_top *top)
 95 {
 96         get_term_dimensions(&top->winsize);
 97         perf_top__update_print_entries(top);
 98 }
 99 
100 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
101 {
102         struct perf_evsel *evsel = hists_to_evsel(he->hists);
103         struct symbol *sym;
104         struct annotation *notes;
105         struct map *map;
106         int err = -1;
107 
108         if (!he || !he->ms.sym)
109                 return -1;
110 
111         sym = he->ms.sym;
112         map = he->ms.map;
113 
114         /*
115          * We can't annotate with just /proc/kallsyms
116          */
117         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
118             !dso__is_kcore(map->dso)) {
119                 pr_err("Can't annotate %s: No vmlinux file was found in the "
120                        "path\n", sym->name);
121                 sleep(1);
122                 return -1;
123         }
124 
125         notes = symbol__annotation(sym);
126         if (notes->src != NULL) {
127                 pthread_mutex_lock(&notes->lock);
128                 goto out_assign;
129         }
130 
131         pthread_mutex_lock(&notes->lock);
132 
133         if (symbol__alloc_hist(sym) < 0) {
134                 pthread_mutex_unlock(&notes->lock);
135                 pr_err("Not enough memory for annotating '%s' symbol!\n",
136                        sym->name);
137                 sleep(1);
138                 return err;
139         }
140 
141         err = symbol__annotate(sym, map, evsel, 0, NULL);
142         if (err == 0) {
143 out_assign:
144                 top->sym_filter_entry = he;
145         } else {
146                 char msg[BUFSIZ];
147                 symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));
148                 pr_err("Couldn't annotate %s: %s\n", sym->name, msg);
149         }
150 
151         pthread_mutex_unlock(&notes->lock);
152         return err;
153 }
154 
155 static void __zero_source_counters(struct hist_entry *he)
156 {
157         struct symbol *sym = he->ms.sym;
158         symbol__annotate_zero_histograms(sym);
159 }
160 
161 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
162 {
163         struct utsname uts;
164         int err = uname(&uts);
165 
166         ui__warning("Out of bounds address found:\n\n"
167                     "Addr:   %" PRIx64 "\n"
168                     "DSO:    %s %c\n"
169                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
170                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
171                     "Arch:   %s\n"
172                     "Kernel: %s\n"
173                     "Tools:  %s\n\n"
174                     "Not all samples will be on the annotation output.\n\n"
175                     "Please report to linux-kernel@vger.kernel.org\n",
176                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
177                     map->start, map->end, sym->start, sym->end,
178                     sym->binding == STB_GLOBAL ? 'g' :
179                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
180                     err ? "[unknown]" : uts.machine,
181                     err ? "[unknown]" : uts.release, perf_version_string);
182         if (use_browser <= 0)
183                 sleep(5);
184 
185         map->erange_warned = true;
186 }
187 
188 static void perf_top__record_precise_ip(struct perf_top *top,
189                                         struct hist_entry *he,
190                                         struct perf_sample *sample,
191                                         int counter, u64 ip)
192 {
193         struct annotation *notes;
194         struct symbol *sym = he->ms.sym;
195         int err = 0;
196 
197         if (sym == NULL || (use_browser == 0 &&
198                             (top->sym_filter_entry == NULL ||
199                              top->sym_filter_entry->ms.sym != sym)))
200                 return;
201 
202         notes = symbol__annotation(sym);
203 
204         if (pthread_mutex_trylock(&notes->lock))
205                 return;
206 
207         err = hist_entry__inc_addr_samples(he, sample, counter, ip);
208 
209         pthread_mutex_unlock(&notes->lock);
210 
211         if (unlikely(err)) {
212                 /*
213                  * This function is now called with he->hists->lock held.
214                  * Release it before going to sleep.
215                  */
216                 pthread_mutex_unlock(&he->hists->lock);
217 
218                 if (err == -ERANGE && !he->ms.map->erange_warned)
219                         ui__warn_map_erange(he->ms.map, sym, ip);
220                 else if (err == -ENOMEM) {
221                         pr_err("Not enough memory for annotating '%s' symbol!\n",
222                                sym->name);
223                         sleep(1);
224                 }
225 
226                 pthread_mutex_lock(&he->hists->lock);
227         }
228 }
229 
230 static void perf_top__show_details(struct perf_top *top)
231 {
232         struct hist_entry *he = top->sym_filter_entry;
233         struct perf_evsel *evsel = hists_to_evsel(he->hists);
234         struct annotation *notes;
235         struct symbol *symbol;
236         int more;
237 
238         if (!he)
239                 return;
240 
241         symbol = he->ms.sym;
242         notes = symbol__annotation(symbol);
243 
244         pthread_mutex_lock(&notes->lock);
245 
246         symbol__calc_percent(symbol, evsel);
247 
248         if (notes->src == NULL)
249                 goto out_unlock;
250 
251         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
252         printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
253 
254         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel,
255                                        0, top->sym_pcnt_filter, top->print_entries, 4);
256 
257         if (top->evlist->enabled) {
258                 if (top->zero)
259                         symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
260                 else
261                         symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
262         }
263         if (more != 0)
264                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
265 out_unlock:
266         pthread_mutex_unlock(&notes->lock);
267 }
268 
269 static void perf_top__print_sym_table(struct perf_top *top)
270 {
271         char bf[160];
272         int printed = 0;
273         const int win_width = top->winsize.ws_col - 1;
274         struct perf_evsel *evsel = top->sym_evsel;
275         struct hists *hists = evsel__hists(evsel);
276 
277         puts(CONSOLE_CLEAR);
278 
279         perf_top__header_snprintf(top, bf, sizeof(bf));
280         printf("%s\n", bf);
281 
282         perf_top__reset_sample_counters(top);
283 
284         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
285 
286         if (!top->record_opts.overwrite &&
287             (hists->stats.nr_lost_warned !=
288             hists->stats.nr_events[PERF_RECORD_LOST])) {
289                 hists->stats.nr_lost_warned =
290                               hists->stats.nr_events[PERF_RECORD_LOST];
291                 color_fprintf(stdout, PERF_COLOR_RED,
292                               "WARNING: LOST %d chunks, Check IO/CPU overload",
293                               hists->stats.nr_lost_warned);
294                 ++printed;
295         }
296 
297         if (top->sym_filter_entry) {
298                 perf_top__show_details(top);
299                 return;
300         }
301 
302         if (top->evlist->enabled) {
303                 if (top->zero) {
304                         hists__delete_entries(hists);
305                 } else {
306                         hists__decay_entries(hists, top->hide_user_symbols,
307                                              top->hide_kernel_symbols);
308                 }
309         }
310 
311         hists__collapse_resort(hists, NULL);
312         perf_evsel__output_resort(evsel, NULL);
313 
314         hists__output_recalc_col_len(hists, top->print_entries - printed);
315         putchar('\n');
316         hists__fprintf(hists, false, top->print_entries - printed, win_width,
317                        top->min_percent, stdout, symbol_conf.use_callchain);
318 }
319 
320 static void prompt_integer(int *target, const char *msg)
321 {
322         char *buf = malloc(0), *p;
323         size_t dummy = 0;
324         int tmp;
325 
326         fprintf(stdout, "\n%s: ", msg);
327         if (getline(&buf, &dummy, stdin) < 0)
328                 return;
329 
330         p = strchr(buf, '\n');
331         if (p)
332                 *p = 0;
333 
334         p = buf;
335         while(*p) {
336                 if (!isdigit(*p))
337                         goto out_free;
338                 p++;
339         }
340         tmp = strtoul(buf, NULL, 10);
341         *target = tmp;
342 out_free:
343         free(buf);
344 }
345 
346 static void prompt_percent(int *target, const char *msg)
347 {
348         int tmp = 0;
349 
350         prompt_integer(&tmp, msg);
351         if (tmp >= 0 && tmp <= 100)
352                 *target = tmp;
353 }
354 
355 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
356 {
357         char *buf = malloc(0), *p;
358         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
359         struct hists *hists = evsel__hists(top->sym_evsel);
360         struct rb_node *next;
361         size_t dummy = 0;
362 
363         /* zero counters of active symbol */
364         if (syme) {
365                 __zero_source_counters(syme);
366                 top->sym_filter_entry = NULL;
367         }
368 
369         fprintf(stdout, "\n%s: ", msg);
370         if (getline(&buf, &dummy, stdin) < 0)
371                 goto out_free;
372 
373         p = strchr(buf, '\n');
374         if (p)
375                 *p = 0;
376 
377         next = rb_first(&hists->entries);
378         while (next) {
379                 n = rb_entry(next, struct hist_entry, rb_node);
380                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
381                         found = n;
382                         break;
383                 }
384                 next = rb_next(&n->rb_node);
385         }
386 
387         if (!found) {
388                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
389                 sleep(1);
390         } else
391                 perf_top__parse_source(top, found);
392 
393 out_free:
394         free(buf);
395 }
396 
397 static void perf_top__print_mapped_keys(struct perf_top *top)
398 {
399         char *name = NULL;
400 
401         if (top->sym_filter_entry) {
402                 struct symbol *sym = top->sym_filter_entry->ms.sym;
403                 name = sym->name;
404         }
405 
406         fprintf(stdout, "\nMapped keys:\n");
407         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
408         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
409 
410         if (top->evlist->nr_entries > 1)
411                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
412 
413         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
414 
415         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
416         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
417         fprintf(stdout, "\t[S]     stop annotation.\n");
418 
419         fprintf(stdout,
420                 "\t[K]     hide kernel symbols.             \t(%s)\n",
421                 top->hide_kernel_symbols ? "yes" : "no");
422         fprintf(stdout,
423                 "\t[U]     hide user symbols.               \t(%s)\n",
424                 top->hide_user_symbols ? "yes" : "no");
425         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
426         fprintf(stdout, "\t[qQ]    quit.\n");
427 }
428 
429 static int perf_top__key_mapped(struct perf_top *top, int c)
430 {
431         switch (c) {
432                 case 'd':
433                 case 'e':
434                 case 'f':
435                 case 'z':
436                 case 'q':
437                 case 'Q':
438                 case 'K':
439                 case 'U':
440                 case 'F':
441                 case 's':
442                 case 'S':
443                         return 1;
444                 case 'E':
445                         return top->evlist->nr_entries > 1 ? 1 : 0;
446                 default:
447                         break;
448         }
449 
450         return 0;
451 }
452 
453 static bool perf_top__handle_keypress(struct perf_top *top, int c)
454 {
455         bool ret = true;
456 
457         if (!perf_top__key_mapped(top, c)) {
458                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
459                 struct termios save;
460 
461                 perf_top__print_mapped_keys(top);
462                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
463                 fflush(stdout);
464 
465                 set_term_quiet_input(&save);
466 
467                 poll(&stdin_poll, 1, -1);
468                 c = getc(stdin);
469 
470                 tcsetattr(0, TCSAFLUSH, &save);
471                 if (!perf_top__key_mapped(top, c))
472                         return ret;
473         }
474 
475         switch (c) {
476                 case 'd':
477                         prompt_integer(&top->delay_secs, "Enter display delay");
478                         if (top->delay_secs < 1)
479                                 top->delay_secs = 1;
480                         break;
481                 case 'e':
482                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
483                         if (top->print_entries == 0) {
484                                 perf_top__resize(top);
485                                 signal(SIGWINCH, winch_sig);
486                         } else {
487                                 signal(SIGWINCH, SIG_DFL);
488                         }
489                         break;
490                 case 'E':
491                         if (top->evlist->nr_entries > 1) {
492                                 /* Select 0 as the default event: */
493                                 int counter = 0;
494 
495                                 fprintf(stderr, "\nAvailable events:");
496 
497                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
498                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
499 
500                                 prompt_integer(&counter, "Enter details event counter");
501 
502                                 if (counter >= top->evlist->nr_entries) {
503                                         top->sym_evsel = perf_evlist__first(top->evlist);
504                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
505                                         sleep(1);
506                                         break;
507                                 }
508                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
509                                         if (top->sym_evsel->idx == counter)
510                                                 break;
511                         } else
512                                 top->sym_evsel = perf_evlist__first(top->evlist);
513                         break;
514                 case 'f':
515                         prompt_integer(&top->count_filter, "Enter display event count filter");
516                         break;
517                 case 'F':
518                         prompt_percent(&top->sym_pcnt_filter,
519                                        "Enter details display event filter (percent)");
520                         break;
521                 case 'K':
522                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
523                         break;
524                 case 'q':
525                 case 'Q':
526                         printf("exiting.\n");
527                         if (top->dump_symtab)
528                                 perf_session__fprintf_dsos(top->session, stderr);
529                         ret = false;
530                         break;
531                 case 's':
532                         perf_top__prompt_symbol(top, "Enter details symbol");
533                         break;
534                 case 'S':
535                         if (!top->sym_filter_entry)
536                                 break;
537                         else {
538                                 struct hist_entry *syme = top->sym_filter_entry;
539 
540                                 top->sym_filter_entry = NULL;
541                                 __zero_source_counters(syme);
542                         }
543                         break;
544                 case 'U':
545                         top->hide_user_symbols = !top->hide_user_symbols;
546                         break;
547                 case 'z':
548                         top->zero = !top->zero;
549                         break;
550                 default:
551                         break;
552         }
553 
554         return ret;
555 }
556 
557 static void perf_top__sort_new_samples(void *arg)
558 {
559         struct perf_top *t = arg;
560         struct perf_evsel *evsel = t->sym_evsel;
561         struct hists *hists;
562 
563         perf_top__reset_sample_counters(t);
564 
565         if (t->evlist->selected != NULL)
566                 t->sym_evsel = t->evlist->selected;
567 
568         hists = evsel__hists(evsel);
569 
570         if (t->evlist->enabled) {
571                 if (t->zero) {
572                         hists__delete_entries(hists);
573                 } else {
574                         hists__decay_entries(hists, t->hide_user_symbols,
575                                              t->hide_kernel_symbols);
576                 }
577         }
578 
579         hists__collapse_resort(hists, NULL);
580         perf_evsel__output_resort(evsel, NULL);
581 }
582 
583 static void *display_thread_tui(void *arg)
584 {
585         struct perf_evsel *pos;
586         struct perf_top *top = arg;
587         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
588         struct hist_browser_timer hbt = {
589                 .timer          = perf_top__sort_new_samples,
590                 .arg            = top,
591                 .refresh        = top->delay_secs,
592         };
593 
594         /* In order to read symbols from other namespaces perf to  needs to call
595          * setns(2).  This isn't permitted if the struct_fs has multiple users.
596          * unshare(2) the fs so that we may continue to setns into namespaces
597          * that we're observing.
598          */
599         unshare(CLONE_FS);
600 
601         perf_top__sort_new_samples(top);
602 
603         /*
604          * Initialize the uid_filter_str, in the future the TUI will allow
605          * Zooming in/out UIDs. For now juse use whatever the user passed
606          * via --uid.
607          */
608         evlist__for_each_entry(top->evlist, pos) {
609                 struct hists *hists = evsel__hists(pos);
610                 hists->uid_filter_str = top->record_opts.target.uid_str;
611         }
612 
613         perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
614                                       top->min_percent,
615                                       &top->session->header.env,
616                                       !top->record_opts.overwrite);
617 
618         done = 1;
619         return NULL;
620 }
621 
622 static void display_sig(int sig __maybe_unused)
623 {
624         done = 1;
625 }
626 
627 static void display_setup_sig(void)
628 {
629         signal(SIGSEGV, sighandler_dump_stack);
630         signal(SIGFPE, sighandler_dump_stack);
631         signal(SIGINT,  display_sig);
632         signal(SIGQUIT, display_sig);
633         signal(SIGTERM, display_sig);
634 }
635 
636 static void *display_thread(void *arg)
637 {
638         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
639         struct termios save;
640         struct perf_top *top = arg;
641         int delay_msecs, c;
642 
643         /* In order to read symbols from other namespaces perf to  needs to call
644          * setns(2).  This isn't permitted if the struct_fs has multiple users.
645          * unshare(2) the fs so that we may continue to setns into namespaces
646          * that we're observing.
647          */
648         unshare(CLONE_FS);
649 
650         display_setup_sig();
651         pthread__unblock_sigwinch();
652 repeat:
653         delay_msecs = top->delay_secs * MSEC_PER_SEC;
654         set_term_quiet_input(&save);
655         /* trash return*/
656         getc(stdin);
657 
658         while (!done) {
659                 perf_top__print_sym_table(top);
660                 /*
661                  * Either timeout expired or we got an EINTR due to SIGWINCH,
662                  * refresh screen in both cases.
663                  */
664                 switch (poll(&stdin_poll, 1, delay_msecs)) {
665                 case 0:
666                         continue;
667                 case -1:
668                         if (errno == EINTR)
669                                 continue;
670                         __fallthrough;
671                 default:
672                         c = getc(stdin);
673                         tcsetattr(0, TCSAFLUSH, &save);
674 
675                         if (perf_top__handle_keypress(top, c))
676                                 goto repeat;
677                         done = 1;
678                 }
679         }
680 
681         tcsetattr(0, TCSAFLUSH, &save);
682         return NULL;
683 }
684 
685 static int hist_iter__top_callback(struct hist_entry_iter *iter,
686                                    struct addr_location *al, bool single,
687                                    void *arg)
688 {
689         struct perf_top *top = arg;
690         struct hist_entry *he = iter->he;
691         struct perf_evsel *evsel = iter->evsel;
692 
693         if (perf_hpp_list.sym && single)
694                 perf_top__record_precise_ip(top, he, iter->sample, evsel->idx, al->addr);
695 
696         hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
697                      !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY));
698         return 0;
699 }
700 
701 static void perf_event__process_sample(struct perf_tool *tool,
702                                        const union perf_event *event,
703                                        struct perf_evsel *evsel,
704                                        struct perf_sample *sample,
705                                        struct machine *machine)
706 {
707         struct perf_top *top = container_of(tool, struct perf_top, tool);
708         struct addr_location al;
709         int err;
710 
711         if (!machine && perf_guest) {
712                 static struct intlist *seen;
713 
714                 if (!seen)
715                         seen = intlist__new(NULL);
716 
717                 if (!intlist__has_entry(seen, sample->pid)) {
718                         pr_err("Can't find guest [%d]'s kernel information\n",
719                                 sample->pid);
720                         intlist__add(seen, sample->pid);
721                 }
722                 return;
723         }
724 
725         if (!machine) {
726                 pr_err("%u unprocessable samples recorded.\r",
727                        top->session->evlist->stats.nr_unprocessable_samples++);
728                 return;
729         }
730 
731         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
732                 top->exact_samples++;
733 
734         if (machine__resolve(machine, &al, sample) < 0)
735                 return;
736 
737         if (!machine->kptr_restrict_warned &&
738             symbol_conf.kptr_restrict &&
739             al.cpumode == PERF_RECORD_MISC_KERNEL) {
740                 if (!perf_evlist__exclude_kernel(top->session->evlist)) {
741                         ui__warning(
742 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
743 "Check /proc/sys/kernel/kptr_restrict.\n\n"
744 "Kernel%s samples will not be resolved.\n",
745                           al.map && !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
746                           " modules" : "");
747                         if (use_browser <= 0)
748                                 sleep(5);
749                 }
750                 machine->kptr_restrict_warned = true;
751         }
752 
753         if (al.sym == NULL) {
754                 const char *msg = "Kernel samples will not be resolved.\n";
755                 /*
756                  * As we do lazy loading of symtabs we only will know if the
757                  * specified vmlinux file is invalid when we actually have a
758                  * hit in kernel space and then try to load it. So if we get
759                  * here and there are _no_ symbols in the DSO backing the
760                  * kernel map, bail out.
761                  *
762                  * We may never get here, for instance, if we use -K/
763                  * --hide-kernel-symbols, even if the user specifies an
764                  * invalid --vmlinux ;-)
765                  */
766                 if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
767                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
768                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
769                         if (symbol_conf.vmlinux_name) {
770                                 char serr[256];
771                                 dso__strerror_load(al.map->dso, serr, sizeof(serr));
772                                 ui__warning("The %s file can't be used: %s\n%s",
773                                             symbol_conf.vmlinux_name, serr, msg);
774                         } else {
775                                 ui__warning("A vmlinux file was not found.\n%s",
776                                             msg);
777                         }
778 
779                         if (use_browser <= 0)
780                                 sleep(5);
781                         top->vmlinux_warned = true;
782                 }
783         }
784 
785         if (al.sym == NULL || !al.sym->idle) {
786                 struct hists *hists = evsel__hists(evsel);
787                 struct hist_entry_iter iter = {
788                         .evsel          = evsel,
789                         .sample         = sample,
790                         .add_entry_cb   = hist_iter__top_callback,
791                 };
792 
793                 if (symbol_conf.cumulate_callchain)
794                         iter.ops = &hist_iter_cumulative;
795                 else
796                         iter.ops = &hist_iter_normal;
797 
798                 pthread_mutex_lock(&hists->lock);
799 
800                 err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
801                 if (err < 0)
802                         pr_err("Problem incrementing symbol period, skipping event\n");
803 
804                 pthread_mutex_unlock(&hists->lock);
805         }
806 
807         addr_location__put(&al);
808 }
809 
810 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
811 {
812         struct record_opts *opts = &top->record_opts;
813         struct perf_evlist *evlist = top->evlist;
814         struct perf_sample sample;
815         struct perf_evsel *evsel;
816         struct perf_mmap *md;
817         struct perf_session *session = top->session;
818         union perf_event *event;
819         struct machine *machine;
820         u64 end, start;
821         int ret;
822 
823         md = opts->overwrite ? &evlist->overwrite_mmap[idx] : &evlist->mmap[idx];
824         if (perf_mmap__read_init(md, opts->overwrite, &start, &end) < 0)
825                 return;
826 
827         while ((event = perf_mmap__read_event(md, opts->overwrite, &start, end)) != NULL) {
828                 ret = perf_evlist__parse_sample(evlist, event, &sample);
829                 if (ret) {
830                         pr_err("Can't parse sample, err = %d\n", ret);
831                         goto next_event;
832                 }
833 
834                 evsel = perf_evlist__id2evsel(session->evlist, sample.id);
835                 assert(evsel != NULL);
836 
837                 if (event->header.type == PERF_RECORD_SAMPLE)
838                         ++top->samples;
839 
840                 switch (sample.cpumode) {
841                 case PERF_RECORD_MISC_USER:
842                         ++top->us_samples;
843                         if (top->hide_user_symbols)
844                                 goto next_event;
845                         machine = &session->machines.host;
846                         break;
847                 case PERF_RECORD_MISC_KERNEL:
848                         ++top->kernel_samples;
849                         if (top->hide_kernel_symbols)
850                                 goto next_event;
851                         machine = &session->machines.host;
852                         break;
853                 case PERF_RECORD_MISC_GUEST_KERNEL:
854                         ++top->guest_kernel_samples;
855                         machine = perf_session__find_machine(session,
856                                                              sample.pid);
857                         break;
858                 case PERF_RECORD_MISC_GUEST_USER:
859                         ++top->guest_us_samples;
860                         /*
861                          * TODO: we don't process guest user from host side
862                          * except simple counting.
863                          */
864                         goto next_event;
865                 default:
866                         if (event->header.type == PERF_RECORD_SAMPLE)
867                                 goto next_event;
868                         machine = &session->machines.host;
869                         break;
870                 }
871 
872 
873                 if (event->header.type == PERF_RECORD_SAMPLE) {
874                         perf_event__process_sample(&top->tool, event, evsel,
875                                                    &sample, machine);
876                 } else if (event->header.type < PERF_RECORD_MAX) {
877                         hists__inc_nr_events(evsel__hists(evsel), event->header.type);
878                         machine__process_event(machine, event, &sample);
879                 } else
880                         ++session->evlist->stats.nr_unknown_events;
881 next_event:
882                 perf_mmap__consume(md, opts->overwrite);
883         }
884 
885         perf_mmap__read_done(md);
886 }
887 
888 static void perf_top__mmap_read(struct perf_top *top)
889 {
890         bool overwrite = top->record_opts.overwrite;
891         struct perf_evlist *evlist = top->evlist;
892         unsigned long long start, end;
893         int i;
894 
895         start = rdclock();
896         if (overwrite)
897                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
898 
899         for (i = 0; i < top->evlist->nr_mmaps; i++)
900                 perf_top__mmap_read_idx(top, i);
901 
902         if (overwrite) {
903                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
904                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
905         }
906         end = rdclock();
907 
908         if ((end - start) > (unsigned long long)top->delay_secs * NSEC_PER_SEC)
909                 ui__warning("Too slow to read ring buffer.\n"
910                             "Please try increasing the period (-c) or\n"
911                             "decreasing the freq (-F) or\n"
912                             "limiting the number of CPUs (-C)\n");
913 }
914 
915 /*
916  * Check per-event overwrite term.
917  * perf top should support consistent term for all events.
918  * - All events don't have per-event term
919  *   E.g. "cpu/cpu-cycles/,cpu/instructions/"
920  *   Nothing change, return 0.
921  * - All events have same per-event term
922  *   E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
923  *   Using the per-event setting to replace the opts->overwrite if
924  *   they are different, then return 0.
925  * - Events have different per-event term
926  *   E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
927  *   Return -1
928  * - Some of the event set per-event term, but some not.
929  *   E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
930  *   Return -1
931  */
932 static int perf_top__overwrite_check(struct perf_top *top)
933 {
934         struct record_opts *opts = &top->record_opts;
935         struct perf_evlist *evlist = top->evlist;
936         struct perf_evsel_config_term *term;
937         struct list_head *config_terms;
938         struct perf_evsel *evsel;
939         int set, overwrite = -1;
940 
941         evlist__for_each_entry(evlist, evsel) {
942                 set = -1;
943                 config_terms = &evsel->config_terms;
944                 list_for_each_entry(term, config_terms, list) {
945                         if (term->type == PERF_EVSEL__CONFIG_TERM_OVERWRITE)
946                                 set = term->val.overwrite ? 1 : 0;
947                 }
948 
949                 /* no term for current and previous event (likely) */
950                 if ((overwrite < 0) && (set < 0))
951                         continue;
952 
953                 /* has term for both current and previous event, compare */
954                 if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
955                         return -1;
956 
957                 /* no term for current event but has term for previous one */
958                 if ((overwrite >= 0) && (set < 0))
959                         return -1;
960 
961                 /* has term for current event */
962                 if ((overwrite < 0) && (set >= 0)) {
963                         /* if it's first event, set overwrite */
964                         if (evsel == perf_evlist__first(evlist))
965                                 overwrite = set;
966                         else
967                                 return -1;
968                 }
969         }
970 
971         if ((overwrite >= 0) && (opts->overwrite != overwrite))
972                 opts->overwrite = overwrite;
973 
974         return 0;
975 }
976 
977 static int perf_top_overwrite_fallback(struct perf_top *top,
978                                        struct perf_evsel *evsel)
979 {
980         struct record_opts *opts = &top->record_opts;
981         struct perf_evlist *evlist = top->evlist;
982         struct perf_evsel *counter;
983 
984         if (!opts->overwrite)
985                 return 0;
986 
987         /* only fall back when first event fails */
988         if (evsel != perf_evlist__first(evlist))
989                 return 0;
990 
991         evlist__for_each_entry(evlist, counter)
992                 counter->attr.write_backward = false;
993         opts->overwrite = false;
994         pr_debug2("fall back to non-overwrite mode\n");
995         return 1;
996 }
997 
998 static int perf_top__start_counters(struct perf_top *top)
999 {
1000         char msg[BUFSIZ];
1001         struct perf_evsel *counter;
1002         struct perf_evlist *evlist = top->evlist;
1003         struct record_opts *opts = &top->record_opts;
1004 
1005         if (perf_top__overwrite_check(top)) {
1006                 ui__error("perf top only support consistent per-event "
1007                           "overwrite setting for all events\n");
1008                 goto out_err;
1009         }
1010 
1011         perf_evlist__config(evlist, opts, &callchain_param);
1012 
1013         evlist__for_each_entry(evlist, counter) {
1014 try_again:
1015                 if (perf_evsel__open(counter, top->evlist->cpus,
1016                                      top->evlist->threads) < 0) {
1017 
1018                         /*
1019                          * Specially handle overwrite fall back.
1020                          * Because perf top is the only tool which has
1021                          * overwrite mode by default, support
1022                          * both overwrite and non-overwrite mode, and
1023                          * require consistent mode for all events.
1024                          *
1025                          * May move it to generic code with more tools
1026                          * have similar attribute.
1027                          */
1028                         if (perf_missing_features.write_backward &&
1029                             perf_top_overwrite_fallback(top, counter))
1030                                 goto try_again;
1031 
1032                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
1033                                 if (verbose > 0)
1034                                         ui__warning("%s\n", msg);
1035                                 goto try_again;
1036                         }
1037 
1038                         perf_evsel__open_strerror(counter, &opts->target,
1039                                                   errno, msg, sizeof(msg));
1040                         ui__error("%s\n", msg);
1041                         goto out_err;
1042                 }
1043         }
1044 
1045         if (perf_evlist__mmap(evlist, opts->mmap_pages) < 0) {
1046                 ui__error("Failed to mmap with %d (%s)\n",
1047                             errno, str_error_r(errno, msg, sizeof(msg)));
1048                 goto out_err;
1049         }
1050 
1051         return 0;
1052 
1053 out_err:
1054         return -1;
1055 }
1056 
1057 static int callchain_param__setup_sample_type(struct callchain_param *callchain)
1058 {
1059         if (!perf_hpp_list.sym) {
1060                 if (callchain->enabled) {
1061                         ui__error("Selected -g but \"sym\" not present in --sort/-s.");
1062                         return -EINVAL;
1063                 }
1064         } else if (callchain->mode != CHAIN_NONE) {
1065                 if (callchain_register_param(callchain) < 0) {
1066                         ui__error("Can't register callchain params.\n");
1067                         return -EINVAL;
1068                 }
1069         }
1070 
1071         return 0;
1072 }
1073 
1074 static int __cmd_top(struct perf_top *top)
1075 {
1076         char msg[512];
1077         struct perf_evsel *pos;
1078         struct perf_evsel_config_term *err_term;
1079         struct perf_evlist *evlist = top->evlist;
1080         struct record_opts *opts = &top->record_opts;
1081         pthread_t thread;
1082         int ret;
1083 
1084         top->session = perf_session__new(NULL, false, NULL);
1085         if (top->session == NULL)
1086                 return -1;
1087 
1088         if (!objdump_path) {
1089                 ret = perf_env__lookup_objdump(&top->session->header.env);
1090                 if (ret)
1091                         goto out_delete;
1092         }
1093 
1094         ret = callchain_param__setup_sample_type(&callchain_param);
1095         if (ret)
1096                 goto out_delete;
1097 
1098         if (perf_session__register_idle_thread(top->session) < 0)
1099                 goto out_delete;
1100 
1101         if (top->nr_threads_synthesize > 1)
1102                 perf_set_multithreaded();
1103 
1104         machine__synthesize_threads(&top->session->machines.host, &opts->target,
1105                                     top->evlist->threads, false,
1106                                     opts->proc_map_timeout,
1107                                     top->nr_threads_synthesize);
1108 
1109         if (top->nr_threads_synthesize > 1)
1110                 perf_set_singlethreaded();
1111 
1112         if (perf_hpp_list.socket) {
1113                 ret = perf_env__read_cpu_topology_map(&perf_env);
1114                 if (ret < 0)
1115                         goto out_err_cpu_topo;
1116         }
1117 
1118         ret = perf_top__start_counters(top);
1119         if (ret)
1120                 goto out_delete;
1121 
1122         ret = perf_evlist__apply_drv_configs(evlist, &pos, &err_term);
1123         if (ret) {
1124                 pr_err("failed to set config \"%s\" on event %s with %d (%s)\n",
1125                         err_term->val.drv_cfg, perf_evsel__name(pos), errno,
1126                         str_error_r(errno, msg, sizeof(msg)));
1127                 goto out_delete;
1128         }
1129 
1130         top->session->evlist = top->evlist;
1131         perf_session__set_id_hdr_size(top->session);
1132 
1133         /*
1134          * When perf is starting the traced process, all the events (apart from
1135          * group members) have enable_on_exec=1 set, so don't spoil it by
1136          * prematurely enabling them.
1137          *
1138          * XXX 'top' still doesn't start workloads like record, trace, but should,
1139          * so leave the check here.
1140          */
1141         if (!target__none(&opts->target))
1142                 perf_evlist__enable(top->evlist);
1143 
1144         /* Wait for a minimal set of events before starting the snapshot */
1145         perf_evlist__poll(top->evlist, 100);
1146 
1147         perf_top__mmap_read(top);
1148 
1149         ret = -1;
1150         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1151                                                             display_thread), top)) {
1152                 ui__error("Could not create display thread.\n");
1153                 goto out_delete;
1154         }
1155 
1156         if (top->realtime_prio) {
1157                 struct sched_param param;
1158 
1159                 param.sched_priority = top->realtime_prio;
1160                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1161                         ui__error("Could not set realtime priority.\n");
1162                         goto out_join;
1163                 }
1164         }
1165 
1166         while (!done) {
1167                 u64 hits = top->samples;
1168 
1169                 perf_top__mmap_read(top);
1170 
1171                 if (opts->overwrite || (hits == top->samples))
1172                         ret = perf_evlist__poll(top->evlist, 100);
1173 
1174                 if (resize) {
1175                         perf_top__resize(top);
1176                         resize = 0;
1177                 }
1178         }
1179 
1180         ret = 0;
1181 out_join:
1182         pthread_join(thread, NULL);
1183 out_delete:
1184         perf_session__delete(top->session);
1185         top->session = NULL;
1186 
1187         return ret;
1188 
1189 out_err_cpu_topo: {
1190         char errbuf[BUFSIZ];
1191         const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
1192 
1193         ui__error("Could not read the CPU topology map: %s\n", err);
1194         goto out_delete;
1195 }
1196 }
1197 
1198 static int
1199 callchain_opt(const struct option *opt, const char *arg, int unset)
1200 {
1201         symbol_conf.use_callchain = true;
1202         return record_callchain_opt(opt, arg, unset);
1203 }
1204 
1205 static int
1206 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1207 {
1208         struct callchain_param *callchain = opt->value;
1209 
1210         callchain->enabled = !unset;
1211         callchain->record_mode = CALLCHAIN_FP;
1212 
1213         /*
1214          * --no-call-graph
1215          */
1216         if (unset) {
1217                 symbol_conf.use_callchain = false;
1218                 callchain->record_mode = CALLCHAIN_NONE;
1219                 return 0;
1220         }
1221 
1222         return parse_callchain_top_opt(arg);
1223 }
1224 
1225 static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
1226 {
1227         if (!strcmp(var, "top.call-graph")) {
1228                 var = "call-graph.record-mode";
1229                 return perf_default_config(var, value, cb);
1230         }
1231         if (!strcmp(var, "top.children")) {
1232                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1233                 return 0;
1234         }
1235 
1236         return 0;
1237 }
1238 
1239 static int
1240 parse_percent_limit(const struct option *opt, const char *arg,
1241                     int unset __maybe_unused)
1242 {
1243         struct perf_top *top = opt->value;
1244 
1245         top->min_percent = strtof(arg, NULL);
1246         return 0;
1247 }
1248 
1249 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1250         "\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1251 
1252 int cmd_top(int argc, const char **argv)
1253 {
1254         char errbuf[BUFSIZ];
1255         struct perf_top top = {
1256                 .count_filter        = 5,
1257                 .delay_secs          = 2,
1258                 .record_opts = {
1259                         .mmap_pages     = UINT_MAX,
1260                         .user_freq      = UINT_MAX,
1261                         .user_interval  = ULLONG_MAX,
1262                         .freq           = 4000, /* 4 KHz */
1263                         .target         = {
1264                                 .uses_mmap   = true,
1265                         },
1266                         .proc_map_timeout    = 500,
1267                         .overwrite      = 1,
1268                 },
1269                 .max_stack           = sysctl_perf_event_max_stack,
1270                 .sym_pcnt_filter     = 5,
1271                 .nr_threads_synthesize = UINT_MAX,
1272         };
1273         struct record_opts *opts = &top.record_opts;
1274         struct target *target = &opts->target;
1275         const struct option options[] = {
1276         OPT_CALLBACK('e', "event", &top.evlist, "event",
1277                      "event selector. use 'perf list' to list available events",
1278                      parse_events_option),
1279         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1280         OPT_STRING('p', "pid", &target->pid, "pid",
1281                     "profile events on existing process id"),
1282         OPT_STRING('t', "tid", &target->tid, "tid",
1283                     "profile events on existing thread id"),
1284         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1285                             "system-wide collection from all CPUs"),
1286         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1287                     "list of cpus to monitor"),
1288         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1289                    "file", "vmlinux pathname"),
1290         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1291                     "don't load vmlinux even if found"),
1292         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1293                     "hide kernel symbols"),
1294         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1295                      "number of mmap data pages",
1296                      perf_evlist__parse_mmap_pages),
1297         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1298                     "collect data with this RT SCHED_FIFO priority"),
1299         OPT_INTEGER('d', "delay", &top.delay_secs,
1300                     "number of seconds to delay between refreshes"),
1301         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1302                             "dump the symbol table used for profiling"),
1303         OPT_INTEGER('f', "count-filter", &top.count_filter,
1304                     "only display functions with more events than this"),
1305         OPT_BOOLEAN(0, "group", &opts->group,
1306                             "put the counters into a counter group"),
1307         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1308                     "child tasks do not inherit counters"),
1309         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1310                     "symbol to annotate"),
1311         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1312         OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
1313         OPT_INTEGER('E', "entries", &top.print_entries,
1314                     "display this many functions"),
1315         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1316                     "hide user symbols"),
1317         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1318         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1319         OPT_INCR('v', "verbose", &verbose,
1320                     "be more verbose (show counter open errors, etc)"),
1321         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1322                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1323                    " Please refer the man page for the complete list."),
1324         OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1325                    "output field(s): overhead, period, sample plus all of sort keys"),
1326         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1327                     "Show a column with the number of samples"),
1328         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1329                            NULL, "enables call-graph recording and display",
1330                            &callchain_opt),
1331         OPT_CALLBACK(0, "call-graph", &callchain_param,
1332                      "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1333                      top_callchain_help, &parse_callchain_opt),
1334         OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1335                     "Accumulate callchains of children and show total overhead as well"),
1336         OPT_INTEGER(0, "max-stack", &top.max_stack,
1337                     "Set the maximum stack depth when parsing the callchain. "
1338                     "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
1339         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1340                    "ignore callees of these functions in call graphs",
1341                    report_parse_ignore_callees_opt),
1342         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1343                     "Show a column with the sum of periods"),
1344         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1345                    "only consider symbols in these dsos"),
1346         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1347                    "only consider symbols in these comms"),
1348         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1349                    "only consider these symbols"),
1350         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1351                     "Interleave source code with assembly code (default)"),
1352         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1353                     "Display raw encoding of assembly instructions (default)"),
1354         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1355                     "Enable kernel symbol demangling"),
1356         OPT_STRING(0, "objdump", &objdump_path, "path",
1357                     "objdump binary to use for disassembly and annotations"),
1358         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1359                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1360         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1361         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1362                      "Don't show entries under that percent", parse_percent_limit),
1363         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1364                      "How to display percentage of filtered entries", parse_filter_percentage),
1365         OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1366                    "width[,width...]",
1367                    "don't try to adjust column width, use these fixed values"),
1368         OPT_UINTEGER(0, "proc-map-timeout", &opts->proc_map_timeout,
1369                         "per thread proc mmap processing timeout in ms"),
1370         OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1371                      "branch any", "sample any taken branches",
1372                      parse_branch_stack),
1373         OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1374                      "branch filter mask", "branch stack filter modes",
1375                      parse_branch_stack),
1376         OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1377                     "Show raw trace event output (do not use print fmt or plugins)"),
1378         OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
1379                     "Show entries in a hierarchy"),
1380         OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
1381         OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
1382                         "number of thread to run event synthesize"),
1383         OPT_END()
1384         };
1385         const char * const top_usage[] = {
1386                 "perf top [<options>]",
1387                 NULL
1388         };
1389         int status = hists__init();
1390 
1391         if (status < 0)
1392                 return status;
1393 
1394         top.evlist = perf_evlist__new();
1395         if (top.evlist == NULL)
1396                 return -ENOMEM;
1397 
1398         status = perf_config(perf_top_config, &top);
1399         if (status)
1400                 return status;
1401 
1402         argc = parse_options(argc, argv, options, top_usage, 0);
1403         if (argc)
1404                 usage_with_options(top_usage, options);
1405 
1406         if (!top.evlist->nr_entries &&
1407             perf_evlist__add_default(top.evlist) < 0) {
1408                 pr_err("Not enough memory for event selector list\n");
1409                 goto out_delete_evlist;
1410         }
1411 
1412         if (symbol_conf.report_hierarchy) {
1413                 /* disable incompatible options */
1414                 symbol_conf.event_group = false;
1415                 symbol_conf.cumulate_callchain = false;
1416 
1417                 if (field_order) {
1418                         pr_err("Error: --hierarchy and --fields options cannot be used together\n");
1419                         parse_options_usage(top_usage, options, "fields", 0);
1420                         parse_options_usage(NULL, options, "hierarchy", 0);
1421                         goto out_delete_evlist;
1422                 }
1423         }
1424 
1425         sort__mode = SORT_MODE__TOP;
1426         /* display thread wants entries to be collapsed in a different tree */
1427         perf_hpp_list.need_collapse = 1;
1428 
1429         if (top.use_stdio)
1430                 use_browser = 0;
1431         else if (top.use_tui)
1432                 use_browser = 1;
1433 
1434         setup_browser(false);
1435 
1436         if (setup_sorting(top.evlist) < 0) {
1437                 if (sort_order)
1438                         parse_options_usage(top_usage, options, "s", 1);
1439                 if (field_order)
1440                         parse_options_usage(sort_order ? NULL : top_usage,
1441                                             options, "fields", 0);
1442                 goto out_delete_evlist;
1443         }
1444 
1445         status = target__validate(target);
1446         if (status) {
1447                 target__strerror(target, status, errbuf, BUFSIZ);
1448                 ui__warning("%s\n", errbuf);
1449         }
1450 
1451         status = target__parse_uid(target);
1452         if (status) {
1453                 int saved_errno = errno;
1454 
1455                 target__strerror(target, status, errbuf, BUFSIZ);
1456                 ui__error("%s\n", errbuf);
1457 
1458                 status = -saved_errno;
1459                 goto out_delete_evlist;
1460         }
1461 
1462         if (target__none(target))
1463                 target->system_wide = true;
1464 
1465         if (perf_evlist__create_maps(top.evlist, target) < 0) {
1466                 ui__error("Couldn't create thread/CPU maps: %s\n",
1467                           errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
1468                 goto out_delete_evlist;
1469         }
1470 
1471         symbol_conf.nr_events = top.evlist->nr_entries;
1472 
1473         if (top.delay_secs < 1)
1474                 top.delay_secs = 1;
1475 
1476         if (record_opts__config(opts)) {
1477                 status = -EINVAL;
1478                 goto out_delete_evlist;
1479         }
1480 
1481         top.sym_evsel = perf_evlist__first(top.evlist);
1482 
1483         if (!callchain_param.enabled) {
1484                 symbol_conf.cumulate_callchain = false;
1485                 perf_hpp__cancel_cumulate();
1486         }
1487 
1488         if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1489                 callchain_param.order = ORDER_CALLER;
1490 
1491         status = symbol__annotation_init();
1492         if (status < 0)
1493                 goto out_delete_evlist;
1494 
1495         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1496         if (symbol__init(NULL) < 0)
1497                 return -1;
1498 
1499         sort__setup_elide(stdout);
1500 
1501         get_term_dimensions(&top.winsize);
1502         if (top.print_entries == 0) {
1503                 perf_top__update_print_entries(&top);
1504                 signal(SIGWINCH, winch_sig);
1505         }
1506 
1507         status = __cmd_top(&top);
1508 
1509 out_delete_evlist:
1510         perf_evlist__delete(top.evlist);
1511 
1512         return status;
1513 }
1514 

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