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Linux/tools/perf/builtin-top.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * builtin-top.c
  4  *
  5  * Builtin top command: Display a continuously updated profile of
  6  * any workload, CPU or specific PID.
  7  *
  8  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  9  *               2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 10  *
 11  * Improvements and fixes by:
 12  *
 13  *   Arjan van de Ven <arjan@linux.intel.com>
 14  *   Yanmin Zhang <yanmin.zhang@intel.com>
 15  *   Wu Fengguang <fengguang.wu@intel.com>
 16  *   Mike Galbraith <efault@gmx.de>
 17  *   Paul Mackerras <paulus@samba.org>
 18  */
 19 #include "builtin.h"
 20 
 21 #include "perf.h"
 22 
 23 #include "util/annotate.h"
 24 #include "util/bpf-event.h"
 25 #include "util/config.h"
 26 #include "util/color.h"
 27 #include "util/dso.h"
 28 #include "util/evlist.h"
 29 #include "util/evsel.h"
 30 #include "util/evsel_config.h"
 31 #include "util/event.h"
 32 #include "util/machine.h"
 33 #include "util/map.h"
 34 #include "util/mmap.h"
 35 #include "util/session.h"
 36 #include "util/symbol.h"
 37 #include "util/synthetic-events.h"
 38 #include "util/top.h"
 39 #include "util/util.h"
 40 #include <linux/rbtree.h>
 41 #include <subcmd/parse-options.h>
 42 #include "util/parse-events.h"
 43 #include "util/callchain.h"
 44 #include "util/cpumap.h"
 45 #include "util/sort.h"
 46 #include "util/string2.h"
 47 #include "util/term.h"
 48 #include "util/intlist.h"
 49 #include "util/parse-branch-options.h"
 50 #include "arch/common.h"
 51 #include "ui/ui.h"
 52 
 53 #include "util/debug.h"
 54 #include "util/ordered-events.h"
 55 
 56 #include <assert.h>
 57 #include <elf.h>
 58 #include <fcntl.h>
 59 
 60 #include <stdio.h>
 61 #include <termios.h>
 62 #include <unistd.h>
 63 #include <inttypes.h>
 64 
 65 #include <errno.h>
 66 #include <time.h>
 67 #include <sched.h>
 68 #include <signal.h>
 69 
 70 #include <sys/syscall.h>
 71 #include <sys/ioctl.h>
 72 #include <poll.h>
 73 #include <sys/prctl.h>
 74 #include <sys/wait.h>
 75 #include <sys/uio.h>
 76 #include <sys/utsname.h>
 77 #include <sys/mman.h>
 78 
 79 #include <linux/stringify.h>
 80 #include <linux/time64.h>
 81 #include <linux/types.h>
 82 #include <linux/err.h>
 83 
 84 #include <linux/ctype.h>
 85 #include <perf/mmap.h>
 86 
 87 static volatile int done;
 88 static volatile int resize;
 89 
 90 #define HEADER_LINE_NR  5
 91 
 92 static void perf_top__update_print_entries(struct perf_top *top)
 93 {
 94         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
 95 }
 96 
 97 static void winch_sig(int sig __maybe_unused)
 98 {
 99         resize = 1;
100 }
101 
102 static void perf_top__resize(struct perf_top *top)
103 {
104         get_term_dimensions(&top->winsize);
105         perf_top__update_print_entries(top);
106 }
107 
108 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
109 {
110         struct evsel *evsel;
111         struct symbol *sym;
112         struct annotation *notes;
113         struct map *map;
114         int err = -1;
115 
116         if (!he || !he->ms.sym)
117                 return -1;
118 
119         evsel = hists_to_evsel(he->hists);
120 
121         sym = he->ms.sym;
122         map = he->ms.map;
123 
124         /*
125          * We can't annotate with just /proc/kallsyms
126          */
127         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
128             !dso__is_kcore(map->dso)) {
129                 pr_err("Can't annotate %s: No vmlinux file was found in the "
130                        "path\n", sym->name);
131                 sleep(1);
132                 return -1;
133         }
134 
135         notes = symbol__annotation(sym);
136         pthread_mutex_lock(&notes->lock);
137 
138         if (!symbol__hists(sym, top->evlist->core.nr_entries)) {
139                 pthread_mutex_unlock(&notes->lock);
140                 pr_err("Not enough memory for annotating '%s' symbol!\n",
141                        sym->name);
142                 sleep(1);
143                 return err;
144         }
145 
146         err = symbol__annotate(&he->ms, evsel, &top->annotation_opts, NULL);
147         if (err == 0) {
148                 top->sym_filter_entry = he;
149         } else {
150                 char msg[BUFSIZ];
151                 symbol__strerror_disassemble(&he->ms, err, msg, sizeof(msg));
152                 pr_err("Couldn't annotate %s: %s\n", sym->name, msg);
153         }
154 
155         pthread_mutex_unlock(&notes->lock);
156         return err;
157 }
158 
159 static void __zero_source_counters(struct hist_entry *he)
160 {
161         struct symbol *sym = he->ms.sym;
162         symbol__annotate_zero_histograms(sym);
163 }
164 
165 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
166 {
167         struct utsname uts;
168         int err = uname(&uts);
169 
170         ui__warning("Out of bounds address found:\n\n"
171                     "Addr:   %" PRIx64 "\n"
172                     "DSO:    %s %c\n"
173                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
174                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
175                     "Arch:   %s\n"
176                     "Kernel: %s\n"
177                     "Tools:  %s\n\n"
178                     "Not all samples will be on the annotation output.\n\n"
179                     "Please report to linux-kernel@vger.kernel.org\n",
180                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
181                     map->start, map->end, sym->start, sym->end,
182                     sym->binding == STB_GLOBAL ? 'g' :
183                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
184                     err ? "[unknown]" : uts.machine,
185                     err ? "[unknown]" : uts.release, perf_version_string);
186         if (use_browser <= 0)
187                 sleep(5);
188 
189         map->erange_warned = true;
190 }
191 
192 static void perf_top__record_precise_ip(struct perf_top *top,
193                                         struct hist_entry *he,
194                                         struct perf_sample *sample,
195                                         struct evsel *evsel, u64 ip)
196 {
197         struct annotation *notes;
198         struct symbol *sym = he->ms.sym;
199         int err = 0;
200 
201         if (sym == NULL || (use_browser == 0 &&
202                             (top->sym_filter_entry == NULL ||
203                              top->sym_filter_entry->ms.sym != sym)))
204                 return;
205 
206         notes = symbol__annotation(sym);
207 
208         if (pthread_mutex_trylock(&notes->lock))
209                 return;
210 
211         err = hist_entry__inc_addr_samples(he, sample, evsel, ip);
212 
213         pthread_mutex_unlock(&notes->lock);
214 
215         if (unlikely(err)) {
216                 /*
217                  * This function is now called with he->hists->lock held.
218                  * Release it before going to sleep.
219                  */
220                 pthread_mutex_unlock(&he->hists->lock);
221 
222                 if (err == -ERANGE && !he->ms.map->erange_warned)
223                         ui__warn_map_erange(he->ms.map, sym, ip);
224                 else if (err == -ENOMEM) {
225                         pr_err("Not enough memory for annotating '%s' symbol!\n",
226                                sym->name);
227                         sleep(1);
228                 }
229 
230                 pthread_mutex_lock(&he->hists->lock);
231         }
232 }
233 
234 static void perf_top__show_details(struct perf_top *top)
235 {
236         struct hist_entry *he = top->sym_filter_entry;
237         struct evsel *evsel;
238         struct annotation *notes;
239         struct symbol *symbol;
240         int more;
241 
242         if (!he)
243                 return;
244 
245         evsel = hists_to_evsel(he->hists);
246 
247         symbol = he->ms.sym;
248         notes = symbol__annotation(symbol);
249 
250         pthread_mutex_lock(&notes->lock);
251 
252         symbol__calc_percent(symbol, evsel);
253 
254         if (notes->src == NULL)
255                 goto out_unlock;
256 
257         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
258         printf("  Events  Pcnt (>=%d%%)\n", top->annotation_opts.min_pcnt);
259 
260         more = symbol__annotate_printf(&he->ms, top->sym_evsel, &top->annotation_opts);
261 
262         if (top->evlist->enabled) {
263                 if (top->zero)
264                         symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
265                 else
266                         symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
267         }
268         if (more != 0)
269                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
270 out_unlock:
271         pthread_mutex_unlock(&notes->lock);
272 }
273 
274 static void perf_top__resort_hists(struct perf_top *t)
275 {
276         struct evlist *evlist = t->evlist;
277         struct evsel *pos;
278 
279         evlist__for_each_entry(evlist, pos) {
280                 struct hists *hists = evsel__hists(pos);
281 
282                 /*
283                  * unlink existing entries so that they can be linked
284                  * in a correct order in hists__match() below.
285                  */
286                 hists__unlink(hists);
287 
288                 if (evlist->enabled) {
289                         if (t->zero) {
290                                 hists__delete_entries(hists);
291                         } else {
292                                 hists__decay_entries(hists, t->hide_user_symbols,
293                                                      t->hide_kernel_symbols);
294                         }
295                 }
296 
297                 hists__collapse_resort(hists, NULL);
298 
299                 /* Non-group events are considered as leader */
300                 if (symbol_conf.event_group &&
301                     !perf_evsel__is_group_leader(pos)) {
302                         struct hists *leader_hists = evsel__hists(pos->leader);
303 
304                         hists__match(leader_hists, hists);
305                         hists__link(leader_hists, hists);
306                 }
307         }
308 
309         evlist__for_each_entry(evlist, pos) {
310                 perf_evsel__output_resort(pos, NULL);
311         }
312 }
313 
314 static void perf_top__print_sym_table(struct perf_top *top)
315 {
316         char bf[160];
317         int printed = 0;
318         const int win_width = top->winsize.ws_col - 1;
319         struct evsel *evsel = top->sym_evsel;
320         struct hists *hists = evsel__hists(evsel);
321 
322         puts(CONSOLE_CLEAR);
323 
324         perf_top__header_snprintf(top, bf, sizeof(bf));
325         printf("%s\n", bf);
326 
327         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
328 
329         if (!top->record_opts.overwrite &&
330             (hists->stats.nr_lost_warned !=
331             hists->stats.nr_events[PERF_RECORD_LOST])) {
332                 hists->stats.nr_lost_warned =
333                               hists->stats.nr_events[PERF_RECORD_LOST];
334                 color_fprintf(stdout, PERF_COLOR_RED,
335                               "WARNING: LOST %d chunks, Check IO/CPU overload",
336                               hists->stats.nr_lost_warned);
337                 ++printed;
338         }
339 
340         if (top->sym_filter_entry) {
341                 perf_top__show_details(top);
342                 return;
343         }
344 
345         perf_top__resort_hists(top);
346 
347         hists__output_recalc_col_len(hists, top->print_entries - printed);
348         putchar('\n');
349         hists__fprintf(hists, false, top->print_entries - printed, win_width,
350                        top->min_percent, stdout, !symbol_conf.use_callchain);
351 }
352 
353 static void prompt_integer(int *target, const char *msg)
354 {
355         char *buf = malloc(0), *p;
356         size_t dummy = 0;
357         int tmp;
358 
359         fprintf(stdout, "\n%s: ", msg);
360         if (getline(&buf, &dummy, stdin) < 0)
361                 return;
362 
363         p = strchr(buf, '\n');
364         if (p)
365                 *p = 0;
366 
367         p = buf;
368         while(*p) {
369                 if (!isdigit(*p))
370                         goto out_free;
371                 p++;
372         }
373         tmp = strtoul(buf, NULL, 10);
374         *target = tmp;
375 out_free:
376         free(buf);
377 }
378 
379 static void prompt_percent(int *target, const char *msg)
380 {
381         int tmp = 0;
382 
383         prompt_integer(&tmp, msg);
384         if (tmp >= 0 && tmp <= 100)
385                 *target = tmp;
386 }
387 
388 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
389 {
390         char *buf = malloc(0), *p;
391         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
392         struct hists *hists = evsel__hists(top->sym_evsel);
393         struct rb_node *next;
394         size_t dummy = 0;
395 
396         /* zero counters of active symbol */
397         if (syme) {
398                 __zero_source_counters(syme);
399                 top->sym_filter_entry = NULL;
400         }
401 
402         fprintf(stdout, "\n%s: ", msg);
403         if (getline(&buf, &dummy, stdin) < 0)
404                 goto out_free;
405 
406         p = strchr(buf, '\n');
407         if (p)
408                 *p = 0;
409 
410         next = rb_first_cached(&hists->entries);
411         while (next) {
412                 n = rb_entry(next, struct hist_entry, rb_node);
413                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
414                         found = n;
415                         break;
416                 }
417                 next = rb_next(&n->rb_node);
418         }
419 
420         if (!found) {
421                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
422                 sleep(1);
423         } else
424                 perf_top__parse_source(top, found);
425 
426 out_free:
427         free(buf);
428 }
429 
430 static void perf_top__print_mapped_keys(struct perf_top *top)
431 {
432         char *name = NULL;
433 
434         if (top->sym_filter_entry) {
435                 struct symbol *sym = top->sym_filter_entry->ms.sym;
436                 name = sym->name;
437         }
438 
439         fprintf(stdout, "\nMapped keys:\n");
440         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
441         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
442 
443         if (top->evlist->core.nr_entries > 1)
444                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
445 
446         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
447 
448         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->annotation_opts.min_pcnt);
449         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
450         fprintf(stdout, "\t[S]     stop annotation.\n");
451 
452         fprintf(stdout,
453                 "\t[K]     hide kernel symbols.             \t(%s)\n",
454                 top->hide_kernel_symbols ? "yes" : "no");
455         fprintf(stdout,
456                 "\t[U]     hide user symbols.               \t(%s)\n",
457                 top->hide_user_symbols ? "yes" : "no");
458         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
459         fprintf(stdout, "\t[qQ]    quit.\n");
460 }
461 
462 static int perf_top__key_mapped(struct perf_top *top, int c)
463 {
464         switch (c) {
465                 case 'd':
466                 case 'e':
467                 case 'f':
468                 case 'z':
469                 case 'q':
470                 case 'Q':
471                 case 'K':
472                 case 'U':
473                 case 'F':
474                 case 's':
475                 case 'S':
476                         return 1;
477                 case 'E':
478                         return top->evlist->core.nr_entries > 1 ? 1 : 0;
479                 default:
480                         break;
481         }
482 
483         return 0;
484 }
485 
486 static bool perf_top__handle_keypress(struct perf_top *top, int c)
487 {
488         bool ret = true;
489 
490         if (!perf_top__key_mapped(top, c)) {
491                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
492                 struct termios save;
493 
494                 perf_top__print_mapped_keys(top);
495                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
496                 fflush(stdout);
497 
498                 set_term_quiet_input(&save);
499 
500                 poll(&stdin_poll, 1, -1);
501                 c = getc(stdin);
502 
503                 tcsetattr(0, TCSAFLUSH, &save);
504                 if (!perf_top__key_mapped(top, c))
505                         return ret;
506         }
507 
508         switch (c) {
509                 case 'd':
510                         prompt_integer(&top->delay_secs, "Enter display delay");
511                         if (top->delay_secs < 1)
512                                 top->delay_secs = 1;
513                         break;
514                 case 'e':
515                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
516                         if (top->print_entries == 0) {
517                                 perf_top__resize(top);
518                                 signal(SIGWINCH, winch_sig);
519                         } else {
520                                 signal(SIGWINCH, SIG_DFL);
521                         }
522                         break;
523                 case 'E':
524                         if (top->evlist->core.nr_entries > 1) {
525                                 /* Select 0 as the default event: */
526                                 int counter = 0;
527 
528                                 fprintf(stderr, "\nAvailable events:");
529 
530                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
531                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
532 
533                                 prompt_integer(&counter, "Enter details event counter");
534 
535                                 if (counter >= top->evlist->core.nr_entries) {
536                                         top->sym_evsel = evlist__first(top->evlist);
537                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
538                                         sleep(1);
539                                         break;
540                                 }
541                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
542                                         if (top->sym_evsel->idx == counter)
543                                                 break;
544                         } else
545                                 top->sym_evsel = evlist__first(top->evlist);
546                         break;
547                 case 'f':
548                         prompt_integer(&top->count_filter, "Enter display event count filter");
549                         break;
550                 case 'F':
551                         prompt_percent(&top->annotation_opts.min_pcnt,
552                                        "Enter details display event filter (percent)");
553                         break;
554                 case 'K':
555                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
556                         break;
557                 case 'q':
558                 case 'Q':
559                         printf("exiting.\n");
560                         if (top->dump_symtab)
561                                 perf_session__fprintf_dsos(top->session, stderr);
562                         ret = false;
563                         break;
564                 case 's':
565                         perf_top__prompt_symbol(top, "Enter details symbol");
566                         break;
567                 case 'S':
568                         if (!top->sym_filter_entry)
569                                 break;
570                         else {
571                                 struct hist_entry *syme = top->sym_filter_entry;
572 
573                                 top->sym_filter_entry = NULL;
574                                 __zero_source_counters(syme);
575                         }
576                         break;
577                 case 'U':
578                         top->hide_user_symbols = !top->hide_user_symbols;
579                         break;
580                 case 'z':
581                         top->zero = !top->zero;
582                         break;
583                 default:
584                         break;
585         }
586 
587         return ret;
588 }
589 
590 static void perf_top__sort_new_samples(void *arg)
591 {
592         struct perf_top *t = arg;
593 
594         if (t->evlist->selected != NULL)
595                 t->sym_evsel = t->evlist->selected;
596 
597         perf_top__resort_hists(t);
598 
599         if (t->lost || t->drop)
600                 pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n");
601 }
602 
603 static void stop_top(void)
604 {
605         session_done = 1;
606         done = 1;
607 }
608 
609 static void *display_thread_tui(void *arg)
610 {
611         struct evsel *pos;
612         struct perf_top *top = arg;
613         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
614         struct hist_browser_timer hbt = {
615                 .timer          = perf_top__sort_new_samples,
616                 .arg            = top,
617                 .refresh        = top->delay_secs,
618         };
619         int ret;
620 
621         /* In order to read symbols from other namespaces perf to  needs to call
622          * setns(2).  This isn't permitted if the struct_fs has multiple users.
623          * unshare(2) the fs so that we may continue to setns into namespaces
624          * that we're observing.
625          */
626         unshare(CLONE_FS);
627 
628         prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
629 
630 repeat:
631         perf_top__sort_new_samples(top);
632 
633         /*
634          * Initialize the uid_filter_str, in the future the TUI will allow
635          * Zooming in/out UIDs. For now just use whatever the user passed
636          * via --uid.
637          */
638         evlist__for_each_entry(top->evlist, pos) {
639                 struct hists *hists = evsel__hists(pos);
640                 hists->uid_filter_str = top->record_opts.target.uid_str;
641         }
642 
643         ret = perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
644                                       top->min_percent,
645                                       &top->session->header.env,
646                                       !top->record_opts.overwrite,
647                                       &top->annotation_opts);
648 
649         if (ret == K_RELOAD) {
650                 top->zero = true;
651                 goto repeat;
652         } else
653                 stop_top();
654 
655         return NULL;
656 }
657 
658 static void display_sig(int sig __maybe_unused)
659 {
660         stop_top();
661 }
662 
663 static void display_setup_sig(void)
664 {
665         signal(SIGSEGV, sighandler_dump_stack);
666         signal(SIGFPE, sighandler_dump_stack);
667         signal(SIGINT,  display_sig);
668         signal(SIGQUIT, display_sig);
669         signal(SIGTERM, display_sig);
670 }
671 
672 static void *display_thread(void *arg)
673 {
674         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
675         struct termios save;
676         struct perf_top *top = arg;
677         int delay_msecs, c;
678 
679         /* In order to read symbols from other namespaces perf to  needs to call
680          * setns(2).  This isn't permitted if the struct_fs has multiple users.
681          * unshare(2) the fs so that we may continue to setns into namespaces
682          * that we're observing.
683          */
684         unshare(CLONE_FS);
685 
686         prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
687 
688         display_setup_sig();
689         pthread__unblock_sigwinch();
690 repeat:
691         delay_msecs = top->delay_secs * MSEC_PER_SEC;
692         set_term_quiet_input(&save);
693         /* trash return*/
694         clearerr(stdin);
695         if (poll(&stdin_poll, 1, 0) > 0)
696                 getc(stdin);
697 
698         while (!done) {
699                 perf_top__print_sym_table(top);
700                 /*
701                  * Either timeout expired or we got an EINTR due to SIGWINCH,
702                  * refresh screen in both cases.
703                  */
704                 switch (poll(&stdin_poll, 1, delay_msecs)) {
705                 case 0:
706                         continue;
707                 case -1:
708                         if (errno == EINTR)
709                                 continue;
710                         __fallthrough;
711                 default:
712                         c = getc(stdin);
713                         tcsetattr(0, TCSAFLUSH, &save);
714 
715                         if (perf_top__handle_keypress(top, c))
716                                 goto repeat;
717                         stop_top();
718                 }
719         }
720 
721         tcsetattr(0, TCSAFLUSH, &save);
722         return NULL;
723 }
724 
725 static int hist_iter__top_callback(struct hist_entry_iter *iter,
726                                    struct addr_location *al, bool single,
727                                    void *arg)
728 {
729         struct perf_top *top = arg;
730         struct hist_entry *he = iter->he;
731         struct evsel *evsel = iter->evsel;
732 
733         if (perf_hpp_list.sym && single)
734                 perf_top__record_precise_ip(top, he, iter->sample, evsel, al->addr);
735 
736         hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
737                      !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY),
738                      NULL);
739         return 0;
740 }
741 
742 static void perf_event__process_sample(struct perf_tool *tool,
743                                        const union perf_event *event,
744                                        struct evsel *evsel,
745                                        struct perf_sample *sample,
746                                        struct machine *machine)
747 {
748         struct perf_top *top = container_of(tool, struct perf_top, tool);
749         struct addr_location al;
750         int err;
751 
752         if (!machine && perf_guest) {
753                 static struct intlist *seen;
754 
755                 if (!seen)
756                         seen = intlist__new(NULL);
757 
758                 if (!intlist__has_entry(seen, sample->pid)) {
759                         pr_err("Can't find guest [%d]'s kernel information\n",
760                                 sample->pid);
761                         intlist__add(seen, sample->pid);
762                 }
763                 return;
764         }
765 
766         if (!machine) {
767                 pr_err("%u unprocessable samples recorded.\r",
768                        top->session->evlist->stats.nr_unprocessable_samples++);
769                 return;
770         }
771 
772         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
773                 top->exact_samples++;
774 
775         if (machine__resolve(machine, &al, sample) < 0)
776                 return;
777 
778         if (!machine->kptr_restrict_warned &&
779             symbol_conf.kptr_restrict &&
780             al.cpumode == PERF_RECORD_MISC_KERNEL) {
781                 if (!perf_evlist__exclude_kernel(top->session->evlist)) {
782                         ui__warning(
783 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
784 "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
785 "Kernel%s samples will not be resolved.\n",
786                           al.map && map__has_symbols(al.map) ?
787                           " modules" : "");
788                         if (use_browser <= 0)
789                                 sleep(5);
790                 }
791                 machine->kptr_restrict_warned = true;
792         }
793 
794         if (al.sym == NULL && al.map != NULL) {
795                 const char *msg = "Kernel samples will not be resolved.\n";
796                 /*
797                  * As we do lazy loading of symtabs we only will know if the
798                  * specified vmlinux file is invalid when we actually have a
799                  * hit in kernel space and then try to load it. So if we get
800                  * here and there are _no_ symbols in the DSO backing the
801                  * kernel map, bail out.
802                  *
803                  * We may never get here, for instance, if we use -K/
804                  * --hide-kernel-symbols, even if the user specifies an
805                  * invalid --vmlinux ;-)
806                  */
807                 if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
808                     __map__is_kernel(al.map) && map__has_symbols(al.map)) {
809                         if (symbol_conf.vmlinux_name) {
810                                 char serr[256];
811                                 dso__strerror_load(al.map->dso, serr, sizeof(serr));
812                                 ui__warning("The %s file can't be used: %s\n%s",
813                                             symbol_conf.vmlinux_name, serr, msg);
814                         } else {
815                                 ui__warning("A vmlinux file was not found.\n%s",
816                                             msg);
817                         }
818 
819                         if (use_browser <= 0)
820                                 sleep(5);
821                         top->vmlinux_warned = true;
822                 }
823         }
824 
825         if (al.sym == NULL || !al.sym->idle) {
826                 struct hists *hists = evsel__hists(evsel);
827                 struct hist_entry_iter iter = {
828                         .evsel          = evsel,
829                         .sample         = sample,
830                         .add_entry_cb   = hist_iter__top_callback,
831                 };
832 
833                 if (symbol_conf.cumulate_callchain)
834                         iter.ops = &hist_iter_cumulative;
835                 else
836                         iter.ops = &hist_iter_normal;
837 
838                 pthread_mutex_lock(&hists->lock);
839 
840                 err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
841                 if (err < 0)
842                         pr_err("Problem incrementing symbol period, skipping event\n");
843 
844                 pthread_mutex_unlock(&hists->lock);
845         }
846 
847         addr_location__put(&al);
848 }
849 
850 static void
851 perf_top__process_lost(struct perf_top *top, union perf_event *event,
852                        struct evsel *evsel)
853 {
854         struct hists *hists = evsel__hists(evsel);
855 
856         top->lost += event->lost.lost;
857         top->lost_total += event->lost.lost;
858         hists->stats.total_lost += event->lost.lost;
859 }
860 
861 static void
862 perf_top__process_lost_samples(struct perf_top *top,
863                                union perf_event *event,
864                                struct evsel *evsel)
865 {
866         struct hists *hists = evsel__hists(evsel);
867 
868         top->lost += event->lost_samples.lost;
869         top->lost_total += event->lost_samples.lost;
870         hists->stats.total_lost_samples += event->lost_samples.lost;
871 }
872 
873 static u64 last_timestamp;
874 
875 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
876 {
877         struct record_opts *opts = &top->record_opts;
878         struct evlist *evlist = top->evlist;
879         struct mmap *md;
880         union perf_event *event;
881 
882         md = opts->overwrite ? &evlist->overwrite_mmap[idx] : &evlist->mmap[idx];
883         if (perf_mmap__read_init(&md->core) < 0)
884                 return;
885 
886         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
887                 int ret;
888 
889                 ret = perf_evlist__parse_sample_timestamp(evlist, event, &last_timestamp);
890                 if (ret && ret != -1)
891                         break;
892 
893                 ret = ordered_events__queue(top->qe.in, event, last_timestamp, 0);
894                 if (ret)
895                         break;
896 
897                 perf_mmap__consume(&md->core);
898 
899                 if (top->qe.rotate) {
900                         pthread_mutex_lock(&top->qe.mutex);
901                         top->qe.rotate = false;
902                         pthread_cond_signal(&top->qe.cond);
903                         pthread_mutex_unlock(&top->qe.mutex);
904                 }
905         }
906 
907         perf_mmap__read_done(&md->core);
908 }
909 
910 static void perf_top__mmap_read(struct perf_top *top)
911 {
912         bool overwrite = top->record_opts.overwrite;
913         struct evlist *evlist = top->evlist;
914         int i;
915 
916         if (overwrite)
917                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
918 
919         for (i = 0; i < top->evlist->core.nr_mmaps; i++)
920                 perf_top__mmap_read_idx(top, i);
921 
922         if (overwrite) {
923                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
924                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
925         }
926 }
927 
928 /*
929  * Check per-event overwrite term.
930  * perf top should support consistent term for all events.
931  * - All events don't have per-event term
932  *   E.g. "cpu/cpu-cycles/,cpu/instructions/"
933  *   Nothing change, return 0.
934  * - All events have same per-event term
935  *   E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
936  *   Using the per-event setting to replace the opts->overwrite if
937  *   they are different, then return 0.
938  * - Events have different per-event term
939  *   E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
940  *   Return -1
941  * - Some of the event set per-event term, but some not.
942  *   E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
943  *   Return -1
944  */
945 static int perf_top__overwrite_check(struct perf_top *top)
946 {
947         struct record_opts *opts = &top->record_opts;
948         struct evlist *evlist = top->evlist;
949         struct perf_evsel_config_term *term;
950         struct list_head *config_terms;
951         struct evsel *evsel;
952         int set, overwrite = -1;
953 
954         evlist__for_each_entry(evlist, evsel) {
955                 set = -1;
956                 config_terms = &evsel->config_terms;
957                 list_for_each_entry(term, config_terms, list) {
958                         if (term->type == PERF_EVSEL__CONFIG_TERM_OVERWRITE)
959                                 set = term->val.overwrite ? 1 : 0;
960                 }
961 
962                 /* no term for current and previous event (likely) */
963                 if ((overwrite < 0) && (set < 0))
964                         continue;
965 
966                 /* has term for both current and previous event, compare */
967                 if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
968                         return -1;
969 
970                 /* no term for current event but has term for previous one */
971                 if ((overwrite >= 0) && (set < 0))
972                         return -1;
973 
974                 /* has term for current event */
975                 if ((overwrite < 0) && (set >= 0)) {
976                         /* if it's first event, set overwrite */
977                         if (evsel == evlist__first(evlist))
978                                 overwrite = set;
979                         else
980                                 return -1;
981                 }
982         }
983 
984         if ((overwrite >= 0) && (opts->overwrite != overwrite))
985                 opts->overwrite = overwrite;
986 
987         return 0;
988 }
989 
990 static int perf_top_overwrite_fallback(struct perf_top *top,
991                                        struct evsel *evsel)
992 {
993         struct record_opts *opts = &top->record_opts;
994         struct evlist *evlist = top->evlist;
995         struct evsel *counter;
996 
997         if (!opts->overwrite)
998                 return 0;
999 
1000         /* only fall back when first event fails */
1001         if (evsel != evlist__first(evlist))
1002                 return 0;
1003 
1004         evlist__for_each_entry(evlist, counter)
1005                 counter->core.attr.write_backward = false;
1006         opts->overwrite = false;
1007         pr_debug2("fall back to non-overwrite mode\n");
1008         return 1;
1009 }
1010 
1011 static int perf_top__start_counters(struct perf_top *top)
1012 {
1013         char msg[BUFSIZ];
1014         struct evsel *counter;
1015         struct evlist *evlist = top->evlist;
1016         struct record_opts *opts = &top->record_opts;
1017 
1018         if (perf_top__overwrite_check(top)) {
1019                 ui__error("perf top only support consistent per-event "
1020                           "overwrite setting for all events\n");
1021                 goto out_err;
1022         }
1023 
1024         perf_evlist__config(evlist, opts, &callchain_param);
1025 
1026         evlist__for_each_entry(evlist, counter) {
1027 try_again:
1028                 if (evsel__open(counter, top->evlist->core.cpus,
1029                                      top->evlist->core.threads) < 0) {
1030 
1031                         /*
1032                          * Specially handle overwrite fall back.
1033                          * Because perf top is the only tool which has
1034                          * overwrite mode by default, support
1035                          * both overwrite and non-overwrite mode, and
1036                          * require consistent mode for all events.
1037                          *
1038                          * May move it to generic code with more tools
1039                          * have similar attribute.
1040                          */
1041                         if (perf_missing_features.write_backward &&
1042                             perf_top_overwrite_fallback(top, counter))
1043                                 goto try_again;
1044 
1045                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
1046                                 if (verbose > 0)
1047                                         ui__warning("%s\n", msg);
1048                                 goto try_again;
1049                         }
1050 
1051                         perf_evsel__open_strerror(counter, &opts->target,
1052                                                   errno, msg, sizeof(msg));
1053                         ui__error("%s\n", msg);
1054                         goto out_err;
1055                 }
1056         }
1057 
1058         if (evlist__mmap(evlist, opts->mmap_pages) < 0) {
1059                 ui__error("Failed to mmap with %d (%s)\n",
1060                             errno, str_error_r(errno, msg, sizeof(msg)));
1061                 goto out_err;
1062         }
1063 
1064         return 0;
1065 
1066 out_err:
1067         return -1;
1068 }
1069 
1070 static int callchain_param__setup_sample_type(struct callchain_param *callchain)
1071 {
1072         if (callchain->mode != CHAIN_NONE) {
1073                 if (callchain_register_param(callchain) < 0) {
1074                         ui__error("Can't register callchain params.\n");
1075                         return -EINVAL;
1076                 }
1077         }
1078 
1079         return 0;
1080 }
1081 
1082 static struct ordered_events *rotate_queues(struct perf_top *top)
1083 {
1084         struct ordered_events *in = top->qe.in;
1085 
1086         if (top->qe.in == &top->qe.data[1])
1087                 top->qe.in = &top->qe.data[0];
1088         else
1089                 top->qe.in = &top->qe.data[1];
1090 
1091         return in;
1092 }
1093 
1094 static void *process_thread(void *arg)
1095 {
1096         struct perf_top *top = arg;
1097 
1098         while (!done) {
1099                 struct ordered_events *out, *in = top->qe.in;
1100 
1101                 if (!in->nr_events) {
1102                         usleep(100);
1103                         continue;
1104                 }
1105 
1106                 out = rotate_queues(top);
1107 
1108                 pthread_mutex_lock(&top->qe.mutex);
1109                 top->qe.rotate = true;
1110                 pthread_cond_wait(&top->qe.cond, &top->qe.mutex);
1111                 pthread_mutex_unlock(&top->qe.mutex);
1112 
1113                 if (ordered_events__flush(out, OE_FLUSH__TOP))
1114                         pr_err("failed to process events\n");
1115         }
1116 
1117         return NULL;
1118 }
1119 
1120 /*
1121  * Allow only 'top->delay_secs' seconds behind samples.
1122  */
1123 static int should_drop(struct ordered_event *qevent, struct perf_top *top)
1124 {
1125         union perf_event *event = qevent->event;
1126         u64 delay_timestamp;
1127 
1128         if (event->header.type != PERF_RECORD_SAMPLE)
1129                 return false;
1130 
1131         delay_timestamp = qevent->timestamp + top->delay_secs * NSEC_PER_SEC;
1132         return delay_timestamp < last_timestamp;
1133 }
1134 
1135 static int deliver_event(struct ordered_events *qe,
1136                          struct ordered_event *qevent)
1137 {
1138         struct perf_top *top = qe->data;
1139         struct evlist *evlist = top->evlist;
1140         struct perf_session *session = top->session;
1141         union perf_event *event = qevent->event;
1142         struct perf_sample sample;
1143         struct evsel *evsel;
1144         struct machine *machine;
1145         int ret = -1;
1146 
1147         if (should_drop(qevent, top)) {
1148                 top->drop++;
1149                 top->drop_total++;
1150                 return 0;
1151         }
1152 
1153         ret = perf_evlist__parse_sample(evlist, event, &sample);
1154         if (ret) {
1155                 pr_err("Can't parse sample, err = %d\n", ret);
1156                 goto next_event;
1157         }
1158 
1159         evsel = perf_evlist__id2evsel(session->evlist, sample.id);
1160         assert(evsel != NULL);
1161 
1162         if (event->header.type == PERF_RECORD_SAMPLE) {
1163                 if (evswitch__discard(&top->evswitch, evsel))
1164                         return 0;
1165                 ++top->samples;
1166         }
1167 
1168         switch (sample.cpumode) {
1169         case PERF_RECORD_MISC_USER:
1170                 ++top->us_samples;
1171                 if (top->hide_user_symbols)
1172                         goto next_event;
1173                 machine = &session->machines.host;
1174                 break;
1175         case PERF_RECORD_MISC_KERNEL:
1176                 ++top->kernel_samples;
1177                 if (top->hide_kernel_symbols)
1178                         goto next_event;
1179                 machine = &session->machines.host;
1180                 break;
1181         case PERF_RECORD_MISC_GUEST_KERNEL:
1182                 ++top->guest_kernel_samples;
1183                 machine = perf_session__find_machine(session,
1184                                                      sample.pid);
1185                 break;
1186         case PERF_RECORD_MISC_GUEST_USER:
1187                 ++top->guest_us_samples;
1188                 /*
1189                  * TODO: we don't process guest user from host side
1190                  * except simple counting.
1191                  */
1192                 goto next_event;
1193         default:
1194                 if (event->header.type == PERF_RECORD_SAMPLE)
1195                         goto next_event;
1196                 machine = &session->machines.host;
1197                 break;
1198         }
1199 
1200         if (event->header.type == PERF_RECORD_SAMPLE) {
1201                 perf_event__process_sample(&top->tool, event, evsel,
1202                                            &sample, machine);
1203         } else if (event->header.type == PERF_RECORD_LOST) {
1204                 perf_top__process_lost(top, event, evsel);
1205         } else if (event->header.type == PERF_RECORD_LOST_SAMPLES) {
1206                 perf_top__process_lost_samples(top, event, evsel);
1207         } else if (event->header.type < PERF_RECORD_MAX) {
1208                 hists__inc_nr_events(evsel__hists(evsel), event->header.type);
1209                 machine__process_event(machine, event, &sample);
1210         } else
1211                 ++session->evlist->stats.nr_unknown_events;
1212 
1213         ret = 0;
1214 next_event:
1215         return ret;
1216 }
1217 
1218 static void init_process_thread(struct perf_top *top)
1219 {
1220         ordered_events__init(&top->qe.data[0], deliver_event, top);
1221         ordered_events__init(&top->qe.data[1], deliver_event, top);
1222         ordered_events__set_copy_on_queue(&top->qe.data[0], true);
1223         ordered_events__set_copy_on_queue(&top->qe.data[1], true);
1224         top->qe.in = &top->qe.data[0];
1225         pthread_mutex_init(&top->qe.mutex, NULL);
1226         pthread_cond_init(&top->qe.cond, NULL);
1227 }
1228 
1229 static int __cmd_top(struct perf_top *top)
1230 {
1231         struct record_opts *opts = &top->record_opts;
1232         pthread_t thread, thread_process;
1233         int ret;
1234 
1235         if (!top->annotation_opts.objdump_path) {
1236                 ret = perf_env__lookup_objdump(&top->session->header.env,
1237                                                &top->annotation_opts.objdump_path);
1238                 if (ret)
1239                         return ret;
1240         }
1241 
1242         ret = callchain_param__setup_sample_type(&callchain_param);
1243         if (ret)
1244                 return ret;
1245 
1246         if (perf_session__register_idle_thread(top->session) < 0)
1247                 return ret;
1248 
1249         if (top->nr_threads_synthesize > 1)
1250                 perf_set_multithreaded();
1251 
1252         init_process_thread(top);
1253 
1254         if (opts->record_namespaces)
1255                 top->tool.namespace_events = true;
1256         if (opts->record_cgroup) {
1257 #ifdef HAVE_FILE_HANDLE
1258                 top->tool.cgroup_events = true;
1259 #else
1260                 pr_err("cgroup tracking is not supported.\n");
1261                 return -1;
1262 #endif
1263         }
1264 
1265         ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
1266                                                 &top->session->machines.host,
1267                                                 &top->record_opts);
1268         if (ret < 0)
1269                 pr_debug("Couldn't synthesize BPF events: Pre-existing BPF programs won't have symbols resolved.\n");
1270 
1271         ret = perf_event__synthesize_cgroups(&top->tool, perf_event__process,
1272                                              &top->session->machines.host);
1273         if (ret < 0)
1274                 pr_debug("Couldn't synthesize cgroup events.\n");
1275 
1276         machine__synthesize_threads(&top->session->machines.host, &opts->target,
1277                                     top->evlist->core.threads, false,
1278                                     top->nr_threads_synthesize);
1279 
1280         if (top->nr_threads_synthesize > 1)
1281                 perf_set_singlethreaded();
1282 
1283         if (perf_hpp_list.socket) {
1284                 ret = perf_env__read_cpu_topology_map(&perf_env);
1285                 if (ret < 0) {
1286                         char errbuf[BUFSIZ];
1287                         const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
1288 
1289                         ui__error("Could not read the CPU topology map: %s\n", err);
1290                         return ret;
1291                 }
1292         }
1293 
1294         ret = perf_top__start_counters(top);
1295         if (ret)
1296                 return ret;
1297 
1298         top->session->evlist = top->evlist;
1299         perf_session__set_id_hdr_size(top->session);
1300 
1301         /*
1302          * When perf is starting the traced process, all the events (apart from
1303          * group members) have enable_on_exec=1 set, so don't spoil it by
1304          * prematurely enabling them.
1305          *
1306          * XXX 'top' still doesn't start workloads like record, trace, but should,
1307          * so leave the check here.
1308          */
1309         if (!target__none(&opts->target))
1310                 evlist__enable(top->evlist);
1311 
1312         ret = -1;
1313         if (pthread_create(&thread_process, NULL, process_thread, top)) {
1314                 ui__error("Could not create process thread.\n");
1315                 return ret;
1316         }
1317 
1318         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1319                                                             display_thread), top)) {
1320                 ui__error("Could not create display thread.\n");
1321                 goto out_join_thread;
1322         }
1323 
1324         if (top->realtime_prio) {
1325                 struct sched_param param;
1326 
1327                 param.sched_priority = top->realtime_prio;
1328                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1329                         ui__error("Could not set realtime priority.\n");
1330                         goto out_join;
1331                 }
1332         }
1333 
1334         /* Wait for a minimal set of events before starting the snapshot */
1335         evlist__poll(top->evlist, 100);
1336 
1337         perf_top__mmap_read(top);
1338 
1339         while (!done) {
1340                 u64 hits = top->samples;
1341 
1342                 perf_top__mmap_read(top);
1343 
1344                 if (opts->overwrite || (hits == top->samples))
1345                         ret = evlist__poll(top->evlist, 100);
1346 
1347                 if (resize) {
1348                         perf_top__resize(top);
1349                         resize = 0;
1350                 }
1351         }
1352 
1353         ret = 0;
1354 out_join:
1355         pthread_join(thread, NULL);
1356 out_join_thread:
1357         pthread_cond_signal(&top->qe.cond);
1358         pthread_join(thread_process, NULL);
1359         return ret;
1360 }
1361 
1362 static int
1363 callchain_opt(const struct option *opt, const char *arg, int unset)
1364 {
1365         symbol_conf.use_callchain = true;
1366         return record_callchain_opt(opt, arg, unset);
1367 }
1368 
1369 static int
1370 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1371 {
1372         struct callchain_param *callchain = opt->value;
1373 
1374         callchain->enabled = !unset;
1375         callchain->record_mode = CALLCHAIN_FP;
1376 
1377         /*
1378          * --no-call-graph
1379          */
1380         if (unset) {
1381                 symbol_conf.use_callchain = false;
1382                 callchain->record_mode = CALLCHAIN_NONE;
1383                 return 0;
1384         }
1385 
1386         return parse_callchain_top_opt(arg);
1387 }
1388 
1389 static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
1390 {
1391         if (!strcmp(var, "top.call-graph")) {
1392                 var = "call-graph.record-mode";
1393                 return perf_default_config(var, value, cb);
1394         }
1395         if (!strcmp(var, "top.children")) {
1396                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1397                 return 0;
1398         }
1399 
1400         return 0;
1401 }
1402 
1403 static int
1404 parse_percent_limit(const struct option *opt, const char *arg,
1405                     int unset __maybe_unused)
1406 {
1407         struct perf_top *top = opt->value;
1408 
1409         top->min_percent = strtof(arg, NULL);
1410         return 0;
1411 }
1412 
1413 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1414         "\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1415 
1416 int cmd_top(int argc, const char **argv)
1417 {
1418         char errbuf[BUFSIZ];
1419         struct perf_top top = {
1420                 .count_filter        = 5,
1421                 .delay_secs          = 2,
1422                 .record_opts = {
1423                         .mmap_pages     = UINT_MAX,
1424                         .user_freq      = UINT_MAX,
1425                         .user_interval  = ULLONG_MAX,
1426                         .freq           = 4000, /* 4 KHz */
1427                         .target         = {
1428                                 .uses_mmap   = true,
1429                         },
1430                         /*
1431                          * FIXME: This will lose PERF_RECORD_MMAP and other metadata
1432                          * when we pause, fix that and reenable. Probably using a
1433                          * separate evlist with a dummy event, i.e. a non-overwrite
1434                          * ring buffer just for metadata events, while PERF_RECORD_SAMPLE
1435                          * stays in overwrite mode. -acme
1436                          * */
1437                         .overwrite      = 0,
1438                         .sample_time    = true,
1439                         .sample_time_set = true,
1440                 },
1441                 .max_stack           = sysctl__max_stack(),
1442                 .annotation_opts     = annotation__default_options,
1443                 .nr_threads_synthesize = UINT_MAX,
1444         };
1445         struct record_opts *opts = &top.record_opts;
1446         struct target *target = &opts->target;
1447         const struct option options[] = {
1448         OPT_CALLBACK('e', "event", &top.evlist, "event",
1449                      "event selector. use 'perf list' to list available events",
1450                      parse_events_option),
1451         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1452         OPT_STRING('p', "pid", &target->pid, "pid",
1453                     "profile events on existing process id"),
1454         OPT_STRING('t', "tid", &target->tid, "tid",
1455                     "profile events on existing thread id"),
1456         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1457                             "system-wide collection from all CPUs"),
1458         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1459                     "list of cpus to monitor"),
1460         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1461                    "file", "vmlinux pathname"),
1462         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1463                     "don't load vmlinux even if found"),
1464         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1465                    "file", "kallsyms pathname"),
1466         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1467                     "hide kernel symbols"),
1468         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1469                      "number of mmap data pages",
1470                      perf_evlist__parse_mmap_pages),
1471         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1472                     "collect data with this RT SCHED_FIFO priority"),
1473         OPT_INTEGER('d', "delay", &top.delay_secs,
1474                     "number of seconds to delay between refreshes"),
1475         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1476                             "dump the symbol table used for profiling"),
1477         OPT_INTEGER('f', "count-filter", &top.count_filter,
1478                     "only display functions with more events than this"),
1479         OPT_BOOLEAN(0, "group", &opts->group,
1480                             "put the counters into a counter group"),
1481         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1482                     "child tasks do not inherit counters"),
1483         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1484                     "symbol to annotate"),
1485         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1486         OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
1487                      "profile at this frequency",
1488                       record__parse_freq),
1489         OPT_INTEGER('E', "entries", &top.print_entries,
1490                     "display this many functions"),
1491         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1492                     "hide user symbols"),
1493         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1494         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1495         OPT_INCR('v', "verbose", &verbose,
1496                     "be more verbose (show counter open errors, etc)"),
1497         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1498                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1499                    " Please refer the man page for the complete list."),
1500         OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1501                    "output field(s): overhead, period, sample plus all of sort keys"),
1502         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1503                     "Show a column with the number of samples"),
1504         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1505                            NULL, "enables call-graph recording and display",
1506                            &callchain_opt),
1507         OPT_CALLBACK(0, "call-graph", &callchain_param,
1508                      "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1509                      top_callchain_help, &parse_callchain_opt),
1510         OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1511                     "Accumulate callchains of children and show total overhead as well"),
1512         OPT_INTEGER(0, "max-stack", &top.max_stack,
1513                     "Set the maximum stack depth when parsing the callchain. "
1514                     "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
1515         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1516                    "ignore callees of these functions in call graphs",
1517                    report_parse_ignore_callees_opt),
1518         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1519                     "Show a column with the sum of periods"),
1520         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1521                    "only consider symbols in these dsos"),
1522         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1523                    "only consider symbols in these comms"),
1524         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1525                    "only consider these symbols"),
1526         OPT_BOOLEAN(0, "source", &top.annotation_opts.annotate_src,
1527                     "Interleave source code with assembly code (default)"),
1528         OPT_BOOLEAN(0, "asm-raw", &top.annotation_opts.show_asm_raw,
1529                     "Display raw encoding of assembly instructions (default)"),
1530         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1531                     "Enable kernel symbol demangling"),
1532         OPT_BOOLEAN(0, "no-bpf-event", &top.record_opts.no_bpf_event, "do not record bpf events"),
1533         OPT_STRING(0, "objdump", &top.annotation_opts.objdump_path, "path",
1534                     "objdump binary to use for disassembly and annotations"),
1535         OPT_STRING('M', "disassembler-style", &top.annotation_opts.disassembler_style, "disassembler style",
1536                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1537         OPT_STRING(0, "prefix", &top.annotation_opts.prefix, "prefix",
1538                     "Add prefix to source file path names in programs (with --prefix-strip)"),
1539         OPT_STRING(0, "prefix-strip", &top.annotation_opts.prefix_strip, "N",
1540                     "Strip first N entries of source file path name in programs (with --prefix)"),
1541         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1542         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1543                      "Don't show entries under that percent", parse_percent_limit),
1544         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1545                      "How to display percentage of filtered entries", parse_filter_percentage),
1546         OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1547                    "width[,width...]",
1548                    "don't try to adjust column width, use these fixed values"),
1549         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1550                         "per thread proc mmap processing timeout in ms"),
1551         OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1552                      "branch any", "sample any taken branches",
1553                      parse_branch_stack),
1554         OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1555                      "branch filter mask", "branch stack filter modes",
1556                      parse_branch_stack),
1557         OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1558                     "Show raw trace event output (do not use print fmt or plugins)"),
1559         OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
1560                     "Show entries in a hierarchy"),
1561         OPT_BOOLEAN(0, "overwrite", &top.record_opts.overwrite,
1562                     "Use a backward ring buffer, default: no"),
1563         OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
1564         OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
1565                         "number of thread to run event synthesize"),
1566         OPT_BOOLEAN(0, "namespaces", &opts->record_namespaces,
1567                     "Record namespaces events"),
1568         OPT_BOOLEAN(0, "all-cgroups", &opts->record_cgroup,
1569                     "Record cgroup events"),
1570         OPT_INTEGER(0, "group-sort-idx", &symbol_conf.group_sort_idx,
1571                     "Sort the output by the event at the index n in group. "
1572                     "If n is invalid, sort by the first event. "
1573                     "WARNING: should be used on grouped events."),
1574         OPTS_EVSWITCH(&top.evswitch),
1575         OPT_END()
1576         };
1577         struct evlist *sb_evlist = NULL;
1578         const char * const top_usage[] = {
1579                 "perf top [<options>]",
1580                 NULL
1581         };
1582         int status = hists__init();
1583 
1584         if (status < 0)
1585                 return status;
1586 
1587         top.annotation_opts.min_pcnt = 5;
1588         top.annotation_opts.context  = 4;
1589 
1590         top.evlist = evlist__new();
1591         if (top.evlist == NULL)
1592                 return -ENOMEM;
1593 
1594         status = perf_config(perf_top_config, &top);
1595         if (status)
1596                 return status;
1597         /*
1598          * Since the per arch annotation init routine may need the cpuid, read
1599          * it here, since we are not getting this from the perf.data header.
1600          */
1601         status = perf_env__read_cpuid(&perf_env);
1602         if (status) {
1603                 /*
1604                  * Some arches do not provide a get_cpuid(), so just use pr_debug, otherwise
1605                  * warn the user explicitely.
1606                  */
1607                 eprintf(status == ENOSYS ? 1 : 0, verbose,
1608                         "Couldn't read the cpuid for this machine: %s\n",
1609                         str_error_r(errno, errbuf, sizeof(errbuf)));
1610         }
1611         top.evlist->env = &perf_env;
1612 
1613         argc = parse_options(argc, argv, options, top_usage, 0);
1614         if (argc)
1615                 usage_with_options(top_usage, options);
1616 
1617         if (annotate_check_args(&top.annotation_opts) < 0)
1618                 goto out_delete_evlist;
1619 
1620         if (!top.evlist->core.nr_entries &&
1621             perf_evlist__add_default(top.evlist) < 0) {
1622                 pr_err("Not enough memory for event selector list\n");
1623                 goto out_delete_evlist;
1624         }
1625 
1626         status = evswitch__init(&top.evswitch, top.evlist, stderr);
1627         if (status)
1628                 goto out_delete_evlist;
1629 
1630         if (symbol_conf.report_hierarchy) {
1631                 /* disable incompatible options */
1632                 symbol_conf.event_group = false;
1633                 symbol_conf.cumulate_callchain = false;
1634 
1635                 if (field_order) {
1636                         pr_err("Error: --hierarchy and --fields options cannot be used together\n");
1637                         parse_options_usage(top_usage, options, "fields", 0);
1638                         parse_options_usage(NULL, options, "hierarchy", 0);
1639                         goto out_delete_evlist;
1640                 }
1641         }
1642 
1643         if (opts->branch_stack && callchain_param.enabled)
1644                 symbol_conf.show_branchflag_count = true;
1645 
1646         sort__mode = SORT_MODE__TOP;
1647         /* display thread wants entries to be collapsed in a different tree */
1648         perf_hpp_list.need_collapse = 1;
1649 
1650         if (top.use_stdio)
1651                 use_browser = 0;
1652         else if (top.use_tui)
1653                 use_browser = 1;
1654 
1655         setup_browser(false);
1656 
1657         if (setup_sorting(top.evlist) < 0) {
1658                 if (sort_order)
1659                         parse_options_usage(top_usage, options, "s", 1);
1660                 if (field_order)
1661                         parse_options_usage(sort_order ? NULL : top_usage,
1662                                             options, "fields", 0);
1663                 goto out_delete_evlist;
1664         }
1665 
1666         status = target__validate(target);
1667         if (status) {
1668                 target__strerror(target, status, errbuf, BUFSIZ);
1669                 ui__warning("%s\n", errbuf);
1670         }
1671 
1672         status = target__parse_uid(target);
1673         if (status) {
1674                 int saved_errno = errno;
1675 
1676                 target__strerror(target, status, errbuf, BUFSIZ);
1677                 ui__error("%s\n", errbuf);
1678 
1679                 status = -saved_errno;
1680                 goto out_delete_evlist;
1681         }
1682 
1683         if (target__none(target))
1684                 target->system_wide = true;
1685 
1686         if (perf_evlist__create_maps(top.evlist, target) < 0) {
1687                 ui__error("Couldn't create thread/CPU maps: %s\n",
1688                           errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
1689                 goto out_delete_evlist;
1690         }
1691 
1692         if (top.delay_secs < 1)
1693                 top.delay_secs = 1;
1694 
1695         if (record_opts__config(opts)) {
1696                 status = -EINVAL;
1697                 goto out_delete_evlist;
1698         }
1699 
1700         top.sym_evsel = evlist__first(top.evlist);
1701 
1702         if (!callchain_param.enabled) {
1703                 symbol_conf.cumulate_callchain = false;
1704                 perf_hpp__cancel_cumulate();
1705         }
1706 
1707         if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1708                 callchain_param.order = ORDER_CALLER;
1709 
1710         status = symbol__annotation_init();
1711         if (status < 0)
1712                 goto out_delete_evlist;
1713 
1714         annotation_config__init(&top.annotation_opts);
1715 
1716         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1717         status = symbol__init(NULL);
1718         if (status < 0)
1719                 goto out_delete_evlist;
1720 
1721         sort__setup_elide(stdout);
1722 
1723         get_term_dimensions(&top.winsize);
1724         if (top.print_entries == 0) {
1725                 perf_top__update_print_entries(&top);
1726                 signal(SIGWINCH, winch_sig);
1727         }
1728 
1729         top.session = perf_session__new(NULL, false, NULL);
1730         if (IS_ERR(top.session)) {
1731                 status = PTR_ERR(top.session);
1732                 goto out_delete_evlist;
1733         }
1734 
1735         if (!top.record_opts.no_bpf_event)
1736                 bpf_event__add_sb_event(&sb_evlist, &perf_env);
1737 
1738         if (perf_evlist__start_sb_thread(sb_evlist, target)) {
1739                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1740                 opts->no_bpf_event = true;
1741         }
1742 
1743         status = __cmd_top(&top);
1744 
1745         if (!opts->no_bpf_event)
1746                 perf_evlist__stop_sb_thread(sb_evlist);
1747 
1748 out_delete_evlist:
1749         evlist__delete(top.evlist);
1750         perf_session__delete(top.session);
1751 
1752         return status;
1753 }
1754 

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