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

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