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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, 0, &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 
620         /* In order to read symbols from other namespaces perf to  needs to call
621          * setns(2).  This isn't permitted if the struct_fs has multiple users.
622          * unshare(2) the fs so that we may continue to setns into namespaces
623          * that we're observing.
624          */
625         unshare(CLONE_FS);
626 
627         prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
628 
629         perf_top__sort_new_samples(top);
630 
631         /*
632          * Initialize the uid_filter_str, in the future the TUI will allow
633          * Zooming in/out UIDs. For now just use whatever the user passed
634          * via --uid.
635          */
636         evlist__for_each_entry(top->evlist, pos) {
637                 struct hists *hists = evsel__hists(pos);
638                 hists->uid_filter_str = top->record_opts.target.uid_str;
639         }
640 
641         perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
642                                       top->min_percent,
643                                       &top->session->header.env,
644                                       !top->record_opts.overwrite,
645                                       &top->annotation_opts);
646 
647         stop_top();
648         return NULL;
649 }
650 
651 static void display_sig(int sig __maybe_unused)
652 {
653         stop_top();
654 }
655 
656 static void display_setup_sig(void)
657 {
658         signal(SIGSEGV, sighandler_dump_stack);
659         signal(SIGFPE, sighandler_dump_stack);
660         signal(SIGINT,  display_sig);
661         signal(SIGQUIT, display_sig);
662         signal(SIGTERM, display_sig);
663 }
664 
665 static void *display_thread(void *arg)
666 {
667         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
668         struct termios save;
669         struct perf_top *top = arg;
670         int delay_msecs, c;
671 
672         /* In order to read symbols from other namespaces perf to  needs to call
673          * setns(2).  This isn't permitted if the struct_fs has multiple users.
674          * unshare(2) the fs so that we may continue to setns into namespaces
675          * that we're observing.
676          */
677         unshare(CLONE_FS);
678 
679         prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
680 
681         display_setup_sig();
682         pthread__unblock_sigwinch();
683 repeat:
684         delay_msecs = top->delay_secs * MSEC_PER_SEC;
685         set_term_quiet_input(&save);
686         /* trash return*/
687         getc(stdin);
688 
689         while (!done) {
690                 perf_top__print_sym_table(top);
691                 /*
692                  * Either timeout expired or we got an EINTR due to SIGWINCH,
693                  * refresh screen in both cases.
694                  */
695                 switch (poll(&stdin_poll, 1, delay_msecs)) {
696                 case 0:
697                         continue;
698                 case -1:
699                         if (errno == EINTR)
700                                 continue;
701                         __fallthrough;
702                 default:
703                         c = getc(stdin);
704                         tcsetattr(0, TCSAFLUSH, &save);
705 
706                         if (perf_top__handle_keypress(top, c))
707                                 goto repeat;
708                         stop_top();
709                 }
710         }
711 
712         tcsetattr(0, TCSAFLUSH, &save);
713         return NULL;
714 }
715 
716 static int hist_iter__top_callback(struct hist_entry_iter *iter,
717                                    struct addr_location *al, bool single,
718                                    void *arg)
719 {
720         struct perf_top *top = arg;
721         struct hist_entry *he = iter->he;
722         struct evsel *evsel = iter->evsel;
723 
724         if (perf_hpp_list.sym && single)
725                 perf_top__record_precise_ip(top, he, iter->sample, evsel, al->addr);
726 
727         hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
728                      !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY),
729                      NULL);
730         return 0;
731 }
732 
733 static void perf_event__process_sample(struct perf_tool *tool,
734                                        const union perf_event *event,
735                                        struct evsel *evsel,
736                                        struct perf_sample *sample,
737                                        struct machine *machine)
738 {
739         struct perf_top *top = container_of(tool, struct perf_top, tool);
740         struct addr_location al;
741         int err;
742 
743         if (!machine && perf_guest) {
744                 static struct intlist *seen;
745 
746                 if (!seen)
747                         seen = intlist__new(NULL);
748 
749                 if (!intlist__has_entry(seen, sample->pid)) {
750                         pr_err("Can't find guest [%d]'s kernel information\n",
751                                 sample->pid);
752                         intlist__add(seen, sample->pid);
753                 }
754                 return;
755         }
756 
757         if (!machine) {
758                 pr_err("%u unprocessable samples recorded.\r",
759                        top->session->evlist->stats.nr_unprocessable_samples++);
760                 return;
761         }
762 
763         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
764                 top->exact_samples++;
765 
766         if (machine__resolve(machine, &al, sample) < 0)
767                 return;
768 
769         if (!machine->kptr_restrict_warned &&
770             symbol_conf.kptr_restrict &&
771             al.cpumode == PERF_RECORD_MISC_KERNEL) {
772                 if (!perf_evlist__exclude_kernel(top->session->evlist)) {
773                         ui__warning(
774 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
775 "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
776 "Kernel%s samples will not be resolved.\n",
777                           al.map && map__has_symbols(al.map) ?
778                           " modules" : "");
779                         if (use_browser <= 0)
780                                 sleep(5);
781                 }
782                 machine->kptr_restrict_warned = true;
783         }
784 
785         if (al.sym == NULL && al.map != NULL) {
786                 const char *msg = "Kernel samples will not be resolved.\n";
787                 /*
788                  * As we do lazy loading of symtabs we only will know if the
789                  * specified vmlinux file is invalid when we actually have a
790                  * hit in kernel space and then try to load it. So if we get
791                  * here and there are _no_ symbols in the DSO backing the
792                  * kernel map, bail out.
793                  *
794                  * We may never get here, for instance, if we use -K/
795                  * --hide-kernel-symbols, even if the user specifies an
796                  * invalid --vmlinux ;-)
797                  */
798                 if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
799                     __map__is_kernel(al.map) && map__has_symbols(al.map)) {
800                         if (symbol_conf.vmlinux_name) {
801                                 char serr[256];
802                                 dso__strerror_load(al.map->dso, serr, sizeof(serr));
803                                 ui__warning("The %s file can't be used: %s\n%s",
804                                             symbol_conf.vmlinux_name, serr, msg);
805                         } else {
806                                 ui__warning("A vmlinux file was not found.\n%s",
807                                             msg);
808                         }
809 
810                         if (use_browser <= 0)
811                                 sleep(5);
812                         top->vmlinux_warned = true;
813                 }
814         }
815 
816         if (al.sym == NULL || !al.sym->idle) {
817                 struct hists *hists = evsel__hists(evsel);
818                 struct hist_entry_iter iter = {
819                         .evsel          = evsel,
820                         .sample         = sample,
821                         .add_entry_cb   = hist_iter__top_callback,
822                 };
823 
824                 if (symbol_conf.cumulate_callchain)
825                         iter.ops = &hist_iter_cumulative;
826                 else
827                         iter.ops = &hist_iter_normal;
828 
829                 pthread_mutex_lock(&hists->lock);
830 
831                 err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
832                 if (err < 0)
833                         pr_err("Problem incrementing symbol period, skipping event\n");
834 
835                 pthread_mutex_unlock(&hists->lock);
836         }
837 
838         addr_location__put(&al);
839 }
840 
841 static void
842 perf_top__process_lost(struct perf_top *top, union perf_event *event,
843                        struct evsel *evsel)
844 {
845         struct hists *hists = evsel__hists(evsel);
846 
847         top->lost += event->lost.lost;
848         top->lost_total += event->lost.lost;
849         hists->stats.total_lost += event->lost.lost;
850 }
851 
852 static void
853 perf_top__process_lost_samples(struct perf_top *top,
854                                union perf_event *event,
855                                struct evsel *evsel)
856 {
857         struct hists *hists = evsel__hists(evsel);
858 
859         top->lost += event->lost_samples.lost;
860         top->lost_total += event->lost_samples.lost;
861         hists->stats.total_lost_samples += event->lost_samples.lost;
862 }
863 
864 static u64 last_timestamp;
865 
866 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
867 {
868         struct record_opts *opts = &top->record_opts;
869         struct evlist *evlist = top->evlist;
870         struct mmap *md;
871         union perf_event *event;
872 
873         md = opts->overwrite ? &evlist->overwrite_mmap[idx] : &evlist->mmap[idx];
874         if (perf_mmap__read_init(&md->core) < 0)
875                 return;
876 
877         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
878                 int ret;
879 
880                 ret = perf_evlist__parse_sample_timestamp(evlist, event, &last_timestamp);
881                 if (ret && ret != -1)
882                         break;
883 
884                 ret = ordered_events__queue(top->qe.in, event, last_timestamp, 0);
885                 if (ret)
886                         break;
887 
888                 perf_mmap__consume(&md->core);
889 
890                 if (top->qe.rotate) {
891                         pthread_mutex_lock(&top->qe.mutex);
892                         top->qe.rotate = false;
893                         pthread_cond_signal(&top->qe.cond);
894                         pthread_mutex_unlock(&top->qe.mutex);
895                 }
896         }
897 
898         perf_mmap__read_done(&md->core);
899 }
900 
901 static void perf_top__mmap_read(struct perf_top *top)
902 {
903         bool overwrite = top->record_opts.overwrite;
904         struct evlist *evlist = top->evlist;
905         int i;
906 
907         if (overwrite)
908                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
909 
910         for (i = 0; i < top->evlist->core.nr_mmaps; i++)
911                 perf_top__mmap_read_idx(top, i);
912 
913         if (overwrite) {
914                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
915                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
916         }
917 }
918 
919 /*
920  * Check per-event overwrite term.
921  * perf top should support consistent term for all events.
922  * - All events don't have per-event term
923  *   E.g. "cpu/cpu-cycles/,cpu/instructions/"
924  *   Nothing change, return 0.
925  * - All events have same per-event term
926  *   E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
927  *   Using the per-event setting to replace the opts->overwrite if
928  *   they are different, then return 0.
929  * - Events have different per-event term
930  *   E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
931  *   Return -1
932  * - Some of the event set per-event term, but some not.
933  *   E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
934  *   Return -1
935  */
936 static int perf_top__overwrite_check(struct perf_top *top)
937 {
938         struct record_opts *opts = &top->record_opts;
939         struct evlist *evlist = top->evlist;
940         struct perf_evsel_config_term *term;
941         struct list_head *config_terms;
942         struct evsel *evsel;
943         int set, overwrite = -1;
944 
945         evlist__for_each_entry(evlist, evsel) {
946                 set = -1;
947                 config_terms = &evsel->config_terms;
948                 list_for_each_entry(term, config_terms, list) {
949                         if (term->type == PERF_EVSEL__CONFIG_TERM_OVERWRITE)
950                                 set = term->val.overwrite ? 1 : 0;
951                 }
952 
953                 /* no term for current and previous event (likely) */
954                 if ((overwrite < 0) && (set < 0))
955                         continue;
956 
957                 /* has term for both current and previous event, compare */
958                 if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
959                         return -1;
960 
961                 /* no term for current event but has term for previous one */
962                 if ((overwrite >= 0) && (set < 0))
963                         return -1;
964 
965                 /* has term for current event */
966                 if ((overwrite < 0) && (set >= 0)) {
967                         /* if it's first event, set overwrite */
968                         if (evsel == evlist__first(evlist))
969                                 overwrite = set;
970                         else
971                                 return -1;
972                 }
973         }
974 
975         if ((overwrite >= 0) && (opts->overwrite != overwrite))
976                 opts->overwrite = overwrite;
977 
978         return 0;
979 }
980 
981 static int perf_top_overwrite_fallback(struct perf_top *top,
982                                        struct evsel *evsel)
983 {
984         struct record_opts *opts = &top->record_opts;
985         struct evlist *evlist = top->evlist;
986         struct evsel *counter;
987 
988         if (!opts->overwrite)
989                 return 0;
990 
991         /* only fall back when first event fails */
992         if (evsel != evlist__first(evlist))
993                 return 0;
994 
995         evlist__for_each_entry(evlist, counter)
996                 counter->core.attr.write_backward = false;
997         opts->overwrite = false;
998         pr_debug2("fall back to non-overwrite mode\n");
999         return 1;
1000 }
1001 
1002 static int perf_top__start_counters(struct perf_top *top)
1003 {
1004         char msg[BUFSIZ];
1005         struct evsel *counter;
1006         struct evlist *evlist = top->evlist;
1007         struct record_opts *opts = &top->record_opts;
1008 
1009         if (perf_top__overwrite_check(top)) {
1010                 ui__error("perf top only support consistent per-event "
1011                           "overwrite setting for all events\n");
1012                 goto out_err;
1013         }
1014 
1015         perf_evlist__config(evlist, opts, &callchain_param);
1016 
1017         evlist__for_each_entry(evlist, counter) {
1018 try_again:
1019                 if (evsel__open(counter, top->evlist->core.cpus,
1020                                      top->evlist->core.threads) < 0) {
1021 
1022                         /*
1023                          * Specially handle overwrite fall back.
1024                          * Because perf top is the only tool which has
1025                          * overwrite mode by default, support
1026                          * both overwrite and non-overwrite mode, and
1027                          * require consistent mode for all events.
1028                          *
1029                          * May move it to generic code with more tools
1030                          * have similar attribute.
1031                          */
1032                         if (perf_missing_features.write_backward &&
1033                             perf_top_overwrite_fallback(top, counter))
1034                                 goto try_again;
1035 
1036                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
1037                                 if (verbose > 0)
1038                                         ui__warning("%s\n", msg);
1039                                 goto try_again;
1040                         }
1041 
1042                         perf_evsel__open_strerror(counter, &opts->target,
1043                                                   errno, msg, sizeof(msg));
1044                         ui__error("%s\n", msg);
1045                         goto out_err;
1046                 }
1047         }
1048 
1049         if (evlist__mmap(evlist, opts->mmap_pages) < 0) {
1050                 ui__error("Failed to mmap with %d (%s)\n",
1051                             errno, str_error_r(errno, msg, sizeof(msg)));
1052                 goto out_err;
1053         }
1054 
1055         return 0;
1056 
1057 out_err:
1058         return -1;
1059 }
1060 
1061 static int callchain_param__setup_sample_type(struct callchain_param *callchain)
1062 {
1063         if (callchain->mode != CHAIN_NONE) {
1064                 if (callchain_register_param(callchain) < 0) {
1065                         ui__error("Can't register callchain params.\n");
1066                         return -EINVAL;
1067                 }
1068         }
1069 
1070         return 0;
1071 }
1072 
1073 static struct ordered_events *rotate_queues(struct perf_top *top)
1074 {
1075         struct ordered_events *in = top->qe.in;
1076 
1077         if (top->qe.in == &top->qe.data[1])
1078                 top->qe.in = &top->qe.data[0];
1079         else
1080                 top->qe.in = &top->qe.data[1];
1081 
1082         return in;
1083 }
1084 
1085 static void *process_thread(void *arg)
1086 {
1087         struct perf_top *top = arg;
1088 
1089         while (!done) {
1090                 struct ordered_events *out, *in = top->qe.in;
1091 
1092                 if (!in->nr_events) {
1093                         usleep(100);
1094                         continue;
1095                 }
1096 
1097                 out = rotate_queues(top);
1098 
1099                 pthread_mutex_lock(&top->qe.mutex);
1100                 top->qe.rotate = true;
1101                 pthread_cond_wait(&top->qe.cond, &top->qe.mutex);
1102                 pthread_mutex_unlock(&top->qe.mutex);
1103 
1104                 if (ordered_events__flush(out, OE_FLUSH__TOP))
1105                         pr_err("failed to process events\n");
1106         }
1107 
1108         return NULL;
1109 }
1110 
1111 /*
1112  * Allow only 'top->delay_secs' seconds behind samples.
1113  */
1114 static int should_drop(struct ordered_event *qevent, struct perf_top *top)
1115 {
1116         union perf_event *event = qevent->event;
1117         u64 delay_timestamp;
1118 
1119         if (event->header.type != PERF_RECORD_SAMPLE)
1120                 return false;
1121 
1122         delay_timestamp = qevent->timestamp + top->delay_secs * NSEC_PER_SEC;
1123         return delay_timestamp < last_timestamp;
1124 }
1125 
1126 static int deliver_event(struct ordered_events *qe,
1127                          struct ordered_event *qevent)
1128 {
1129         struct perf_top *top = qe->data;
1130         struct evlist *evlist = top->evlist;
1131         struct perf_session *session = top->session;
1132         union perf_event *event = qevent->event;
1133         struct perf_sample sample;
1134         struct evsel *evsel;
1135         struct machine *machine;
1136         int ret = -1;
1137 
1138         if (should_drop(qevent, top)) {
1139                 top->drop++;
1140                 top->drop_total++;
1141                 return 0;
1142         }
1143 
1144         ret = perf_evlist__parse_sample(evlist, event, &sample);
1145         if (ret) {
1146                 pr_err("Can't parse sample, err = %d\n", ret);
1147                 goto next_event;
1148         }
1149 
1150         evsel = perf_evlist__id2evsel(session->evlist, sample.id);
1151         assert(evsel != NULL);
1152 
1153         if (event->header.type == PERF_RECORD_SAMPLE) {
1154                 if (evswitch__discard(&top->evswitch, evsel))
1155                         return 0;
1156                 ++top->samples;
1157         }
1158 
1159         switch (sample.cpumode) {
1160         case PERF_RECORD_MISC_USER:
1161                 ++top->us_samples;
1162                 if (top->hide_user_symbols)
1163                         goto next_event;
1164                 machine = &session->machines.host;
1165                 break;
1166         case PERF_RECORD_MISC_KERNEL:
1167                 ++top->kernel_samples;
1168                 if (top->hide_kernel_symbols)
1169                         goto next_event;
1170                 machine = &session->machines.host;
1171                 break;
1172         case PERF_RECORD_MISC_GUEST_KERNEL:
1173                 ++top->guest_kernel_samples;
1174                 machine = perf_session__find_machine(session,
1175                                                      sample.pid);
1176                 break;
1177         case PERF_RECORD_MISC_GUEST_USER:
1178                 ++top->guest_us_samples;
1179                 /*
1180                  * TODO: we don't process guest user from host side
1181                  * except simple counting.
1182                  */
1183                 goto next_event;
1184         default:
1185                 if (event->header.type == PERF_RECORD_SAMPLE)
1186                         goto next_event;
1187                 machine = &session->machines.host;
1188                 break;
1189         }
1190 
1191         if (event->header.type == PERF_RECORD_SAMPLE) {
1192                 perf_event__process_sample(&top->tool, event, evsel,
1193                                            &sample, machine);
1194         } else if (event->header.type == PERF_RECORD_LOST) {
1195                 perf_top__process_lost(top, event, evsel);
1196         } else if (event->header.type == PERF_RECORD_LOST_SAMPLES) {
1197                 perf_top__process_lost_samples(top, event, evsel);
1198         } else if (event->header.type < PERF_RECORD_MAX) {
1199                 hists__inc_nr_events(evsel__hists(evsel), event->header.type);
1200                 machine__process_event(machine, event, &sample);
1201         } else
1202                 ++session->evlist->stats.nr_unknown_events;
1203 
1204         ret = 0;
1205 next_event:
1206         return ret;
1207 }
1208 
1209 static void init_process_thread(struct perf_top *top)
1210 {
1211         ordered_events__init(&top->qe.data[0], deliver_event, top);
1212         ordered_events__init(&top->qe.data[1], deliver_event, top);
1213         ordered_events__set_copy_on_queue(&top->qe.data[0], true);
1214         ordered_events__set_copy_on_queue(&top->qe.data[1], true);
1215         top->qe.in = &top->qe.data[0];
1216         pthread_mutex_init(&top->qe.mutex, NULL);
1217         pthread_cond_init(&top->qe.cond, NULL);
1218 }
1219 
1220 static int __cmd_top(struct perf_top *top)
1221 {
1222         struct record_opts *opts = &top->record_opts;
1223         pthread_t thread, thread_process;
1224         int ret;
1225 
1226         if (!top->annotation_opts.objdump_path) {
1227                 ret = perf_env__lookup_objdump(&top->session->header.env,
1228                                                &top->annotation_opts.objdump_path);
1229                 if (ret)
1230                         return ret;
1231         }
1232 
1233         ret = callchain_param__setup_sample_type(&callchain_param);
1234         if (ret)
1235                 return ret;
1236 
1237         if (perf_session__register_idle_thread(top->session) < 0)
1238                 return ret;
1239 
1240         if (top->nr_threads_synthesize > 1)
1241                 perf_set_multithreaded();
1242 
1243         init_process_thread(top);
1244 
1245         if (opts->record_namespaces)
1246                 top->tool.namespace_events = true;
1247 
1248         ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
1249                                                 &top->session->machines.host,
1250                                                 &top->record_opts);
1251         if (ret < 0)
1252                 pr_debug("Couldn't synthesize BPF events: Pre-existing BPF programs won't have symbols resolved.\n");
1253 
1254         machine__synthesize_threads(&top->session->machines.host, &opts->target,
1255                                     top->evlist->core.threads, false,
1256                                     top->nr_threads_synthesize);
1257 
1258         if (top->nr_threads_synthesize > 1)
1259                 perf_set_singlethreaded();
1260 
1261         if (perf_hpp_list.socket) {
1262                 ret = perf_env__read_cpu_topology_map(&perf_env);
1263                 if (ret < 0) {
1264                         char errbuf[BUFSIZ];
1265                         const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
1266 
1267                         ui__error("Could not read the CPU topology map: %s\n", err);
1268                         return ret;
1269                 }
1270         }
1271 
1272         ret = perf_top__start_counters(top);
1273         if (ret)
1274                 return ret;
1275 
1276         top->session->evlist = top->evlist;
1277         perf_session__set_id_hdr_size(top->session);
1278 
1279         /*
1280          * When perf is starting the traced process, all the events (apart from
1281          * group members) have enable_on_exec=1 set, so don't spoil it by
1282          * prematurely enabling them.
1283          *
1284          * XXX 'top' still doesn't start workloads like record, trace, but should,
1285          * so leave the check here.
1286          */
1287         if (!target__none(&opts->target))
1288                 evlist__enable(top->evlist);
1289 
1290         ret = -1;
1291         if (pthread_create(&thread_process, NULL, process_thread, top)) {
1292                 ui__error("Could not create process thread.\n");
1293                 return ret;
1294         }
1295 
1296         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1297                                                             display_thread), top)) {
1298                 ui__error("Could not create display thread.\n");
1299                 goto out_join_thread;
1300         }
1301 
1302         if (top->realtime_prio) {
1303                 struct sched_param param;
1304 
1305                 param.sched_priority = top->realtime_prio;
1306                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1307                         ui__error("Could not set realtime priority.\n");
1308                         goto out_join;
1309                 }
1310         }
1311 
1312         /* Wait for a minimal set of events before starting the snapshot */
1313         evlist__poll(top->evlist, 100);
1314 
1315         perf_top__mmap_read(top);
1316 
1317         while (!done) {
1318                 u64 hits = top->samples;
1319 
1320                 perf_top__mmap_read(top);
1321 
1322                 if (opts->overwrite || (hits == top->samples))
1323                         ret = evlist__poll(top->evlist, 100);
1324 
1325                 if (resize) {
1326                         perf_top__resize(top);
1327                         resize = 0;
1328                 }
1329         }
1330 
1331         ret = 0;
1332 out_join:
1333         pthread_join(thread, NULL);
1334 out_join_thread:
1335         pthread_cond_signal(&top->qe.cond);
1336         pthread_join(thread_process, NULL);
1337         return ret;
1338 }
1339 
1340 static int
1341 callchain_opt(const struct option *opt, const char *arg, int unset)
1342 {
1343         symbol_conf.use_callchain = true;
1344         return record_callchain_opt(opt, arg, unset);
1345 }
1346 
1347 static int
1348 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1349 {
1350         struct callchain_param *callchain = opt->value;
1351 
1352         callchain->enabled = !unset;
1353         callchain->record_mode = CALLCHAIN_FP;
1354 
1355         /*
1356          * --no-call-graph
1357          */
1358         if (unset) {
1359                 symbol_conf.use_callchain = false;
1360                 callchain->record_mode = CALLCHAIN_NONE;
1361                 return 0;
1362         }
1363 
1364         return parse_callchain_top_opt(arg);
1365 }
1366 
1367 static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
1368 {
1369         if (!strcmp(var, "top.call-graph")) {
1370                 var = "call-graph.record-mode";
1371                 return perf_default_config(var, value, cb);
1372         }
1373         if (!strcmp(var, "top.children")) {
1374                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1375                 return 0;
1376         }
1377 
1378         return 0;
1379 }
1380 
1381 static int
1382 parse_percent_limit(const struct option *opt, const char *arg,
1383                     int unset __maybe_unused)
1384 {
1385         struct perf_top *top = opt->value;
1386 
1387         top->min_percent = strtof(arg, NULL);
1388         return 0;
1389 }
1390 
1391 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1392         "\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1393 
1394 int cmd_top(int argc, const char **argv)
1395 {
1396         char errbuf[BUFSIZ];
1397         struct perf_top top = {
1398                 .count_filter        = 5,
1399                 .delay_secs          = 2,
1400                 .record_opts = {
1401                         .mmap_pages     = UINT_MAX,
1402                         .user_freq      = UINT_MAX,
1403                         .user_interval  = ULLONG_MAX,
1404                         .freq           = 4000, /* 4 KHz */
1405                         .target         = {
1406                                 .uses_mmap   = true,
1407                         },
1408                         /*
1409                          * FIXME: This will lose PERF_RECORD_MMAP and other metadata
1410                          * when we pause, fix that and reenable. Probably using a
1411                          * separate evlist with a dummy event, i.e. a non-overwrite
1412                          * ring buffer just for metadata events, while PERF_RECORD_SAMPLE
1413                          * stays in overwrite mode. -acme
1414                          * */
1415                         .overwrite      = 0,
1416                         .sample_time    = true,
1417                         .sample_time_set = true,
1418                 },
1419                 .max_stack           = sysctl__max_stack(),
1420                 .annotation_opts     = annotation__default_options,
1421                 .nr_threads_synthesize = UINT_MAX,
1422         };
1423         struct record_opts *opts = &top.record_opts;
1424         struct target *target = &opts->target;
1425         const struct option options[] = {
1426         OPT_CALLBACK('e', "event", &top.evlist, "event",
1427                      "event selector. use 'perf list' to list available events",
1428                      parse_events_option),
1429         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1430         OPT_STRING('p', "pid", &target->pid, "pid",
1431                     "profile events on existing process id"),
1432         OPT_STRING('t', "tid", &target->tid, "tid",
1433                     "profile events on existing thread id"),
1434         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1435                             "system-wide collection from all CPUs"),
1436         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1437                     "list of cpus to monitor"),
1438         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1439                    "file", "vmlinux pathname"),
1440         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1441                     "don't load vmlinux even if found"),
1442         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1443                    "file", "kallsyms pathname"),
1444         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1445                     "hide kernel symbols"),
1446         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1447                      "number of mmap data pages",
1448                      perf_evlist__parse_mmap_pages),
1449         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1450                     "collect data with this RT SCHED_FIFO priority"),
1451         OPT_INTEGER('d', "delay", &top.delay_secs,
1452                     "number of seconds to delay between refreshes"),
1453         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1454                             "dump the symbol table used for profiling"),
1455         OPT_INTEGER('f', "count-filter", &top.count_filter,
1456                     "only display functions with more events than this"),
1457         OPT_BOOLEAN(0, "group", &opts->group,
1458                             "put the counters into a counter group"),
1459         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1460                     "child tasks do not inherit counters"),
1461         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1462                     "symbol to annotate"),
1463         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1464         OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
1465                      "profile at this frequency",
1466                       record__parse_freq),
1467         OPT_INTEGER('E', "entries", &top.print_entries,
1468                     "display this many functions"),
1469         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1470                     "hide user symbols"),
1471         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1472         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1473         OPT_INCR('v', "verbose", &verbose,
1474                     "be more verbose (show counter open errors, etc)"),
1475         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1476                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1477                    " Please refer the man page for the complete list."),
1478         OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1479                    "output field(s): overhead, period, sample plus all of sort keys"),
1480         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1481                     "Show a column with the number of samples"),
1482         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1483                            NULL, "enables call-graph recording and display",
1484                            &callchain_opt),
1485         OPT_CALLBACK(0, "call-graph", &callchain_param,
1486                      "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1487                      top_callchain_help, &parse_callchain_opt),
1488         OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1489                     "Accumulate callchains of children and show total overhead as well"),
1490         OPT_INTEGER(0, "max-stack", &top.max_stack,
1491                     "Set the maximum stack depth when parsing the callchain. "
1492                     "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
1493         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1494                    "ignore callees of these functions in call graphs",
1495                    report_parse_ignore_callees_opt),
1496         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1497                     "Show a column with the sum of periods"),
1498         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1499                    "only consider symbols in these dsos"),
1500         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1501                    "only consider symbols in these comms"),
1502         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1503                    "only consider these symbols"),
1504         OPT_BOOLEAN(0, "source", &top.annotation_opts.annotate_src,
1505                     "Interleave source code with assembly code (default)"),
1506         OPT_BOOLEAN(0, "asm-raw", &top.annotation_opts.show_asm_raw,
1507                     "Display raw encoding of assembly instructions (default)"),
1508         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1509                     "Enable kernel symbol demangling"),
1510         OPT_BOOLEAN(0, "no-bpf-event", &top.record_opts.no_bpf_event, "do not record bpf events"),
1511         OPT_STRING(0, "objdump", &top.annotation_opts.objdump_path, "path",
1512                     "objdump binary to use for disassembly and annotations"),
1513         OPT_STRING('M', "disassembler-style", &top.annotation_opts.disassembler_style, "disassembler style",
1514                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1515         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1516         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1517                      "Don't show entries under that percent", parse_percent_limit),
1518         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1519                      "How to display percentage of filtered entries", parse_filter_percentage),
1520         OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1521                    "width[,width...]",
1522                    "don't try to adjust column width, use these fixed values"),
1523         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1524                         "per thread proc mmap processing timeout in ms"),
1525         OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1526                      "branch any", "sample any taken branches",
1527                      parse_branch_stack),
1528         OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1529                      "branch filter mask", "branch stack filter modes",
1530                      parse_branch_stack),
1531         OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1532                     "Show raw trace event output (do not use print fmt or plugins)"),
1533         OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
1534                     "Show entries in a hierarchy"),
1535         OPT_BOOLEAN(0, "overwrite", &top.record_opts.overwrite,
1536                     "Use a backward ring buffer, default: no"),
1537         OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
1538         OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
1539                         "number of thread to run event synthesize"),
1540         OPT_BOOLEAN(0, "namespaces", &opts->record_namespaces,
1541                     "Record namespaces events"),
1542         OPTS_EVSWITCH(&top.evswitch),
1543         OPT_END()
1544         };
1545         struct evlist *sb_evlist = NULL;
1546         const char * const top_usage[] = {
1547                 "perf top [<options>]",
1548                 NULL
1549         };
1550         int status = hists__init();
1551 
1552         if (status < 0)
1553                 return status;
1554 
1555         top.annotation_opts.min_pcnt = 5;
1556         top.annotation_opts.context  = 4;
1557 
1558         top.evlist = evlist__new();
1559         if (top.evlist == NULL)
1560                 return -ENOMEM;
1561 
1562         status = perf_config(perf_top_config, &top);
1563         if (status)
1564                 return status;
1565         /*
1566          * Since the per arch annotation init routine may need the cpuid, read
1567          * it here, since we are not getting this from the perf.data header.
1568          */
1569         status = perf_env__read_cpuid(&perf_env);
1570         if (status) {
1571                 /*
1572                  * Some arches do not provide a get_cpuid(), so just use pr_debug, otherwise
1573                  * warn the user explicitely.
1574                  */
1575                 eprintf(status == ENOSYS ? 1 : 0, verbose,
1576                         "Couldn't read the cpuid for this machine: %s\n",
1577                         str_error_r(errno, errbuf, sizeof(errbuf)));
1578         }
1579         top.evlist->env = &perf_env;
1580 
1581         argc = parse_options(argc, argv, options, top_usage, 0);
1582         if (argc)
1583                 usage_with_options(top_usage, options);
1584 
1585         if (!top.evlist->core.nr_entries &&
1586             perf_evlist__add_default(top.evlist) < 0) {
1587                 pr_err("Not enough memory for event selector list\n");
1588                 goto out_delete_evlist;
1589         }
1590 
1591         status = evswitch__init(&top.evswitch, top.evlist, stderr);
1592         if (status)
1593                 goto out_delete_evlist;
1594 
1595         if (symbol_conf.report_hierarchy) {
1596                 /* disable incompatible options */
1597                 symbol_conf.event_group = false;
1598                 symbol_conf.cumulate_callchain = false;
1599 
1600                 if (field_order) {
1601                         pr_err("Error: --hierarchy and --fields options cannot be used together\n");
1602                         parse_options_usage(top_usage, options, "fields", 0);
1603                         parse_options_usage(NULL, options, "hierarchy", 0);
1604                         goto out_delete_evlist;
1605                 }
1606         }
1607 
1608         if (opts->branch_stack && callchain_param.enabled)
1609                 symbol_conf.show_branchflag_count = true;
1610 
1611         sort__mode = SORT_MODE__TOP;
1612         /* display thread wants entries to be collapsed in a different tree */
1613         perf_hpp_list.need_collapse = 1;
1614 
1615         if (top.use_stdio)
1616                 use_browser = 0;
1617         else if (top.use_tui)
1618                 use_browser = 1;
1619 
1620         setup_browser(false);
1621 
1622         if (setup_sorting(top.evlist) < 0) {
1623                 if (sort_order)
1624                         parse_options_usage(top_usage, options, "s", 1);
1625                 if (field_order)
1626                         parse_options_usage(sort_order ? NULL : top_usage,
1627                                             options, "fields", 0);
1628                 goto out_delete_evlist;
1629         }
1630 
1631         status = target__validate(target);
1632         if (status) {
1633                 target__strerror(target, status, errbuf, BUFSIZ);
1634                 ui__warning("%s\n", errbuf);
1635         }
1636 
1637         status = target__parse_uid(target);
1638         if (status) {
1639                 int saved_errno = errno;
1640 
1641                 target__strerror(target, status, errbuf, BUFSIZ);
1642                 ui__error("%s\n", errbuf);
1643 
1644                 status = -saved_errno;
1645                 goto out_delete_evlist;
1646         }
1647 
1648         if (target__none(target))
1649                 target->system_wide = true;
1650 
1651         if (perf_evlist__create_maps(top.evlist, target) < 0) {
1652                 ui__error("Couldn't create thread/CPU maps: %s\n",
1653                           errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
1654                 goto out_delete_evlist;
1655         }
1656 
1657         if (top.delay_secs < 1)
1658                 top.delay_secs = 1;
1659 
1660         if (record_opts__config(opts)) {
1661                 status = -EINVAL;
1662                 goto out_delete_evlist;
1663         }
1664 
1665         top.sym_evsel = evlist__first(top.evlist);
1666 
1667         if (!callchain_param.enabled) {
1668                 symbol_conf.cumulate_callchain = false;
1669                 perf_hpp__cancel_cumulate();
1670         }
1671 
1672         if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1673                 callchain_param.order = ORDER_CALLER;
1674 
1675         status = symbol__annotation_init();
1676         if (status < 0)
1677                 goto out_delete_evlist;
1678 
1679         annotation_config__init();
1680 
1681         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1682         status = symbol__init(NULL);
1683         if (status < 0)
1684                 goto out_delete_evlist;
1685 
1686         sort__setup_elide(stdout);
1687 
1688         get_term_dimensions(&top.winsize);
1689         if (top.print_entries == 0) {
1690                 perf_top__update_print_entries(&top);
1691                 signal(SIGWINCH, winch_sig);
1692         }
1693 
1694         top.session = perf_session__new(NULL, false, NULL);
1695         if (IS_ERR(top.session)) {
1696                 status = PTR_ERR(top.session);
1697                 goto out_delete_evlist;
1698         }
1699 
1700         if (!top.record_opts.no_bpf_event)
1701                 bpf_event__add_sb_event(&sb_evlist, &perf_env);
1702 
1703         if (perf_evlist__start_sb_thread(sb_evlist, target)) {
1704                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1705                 opts->no_bpf_event = true;
1706         }
1707 
1708         status = __cmd_top(&top);
1709 
1710         if (!opts->no_bpf_event)
1711                 perf_evlist__stop_sb_thread(sb_evlist);
1712 
1713 out_delete_evlist:
1714         evlist__delete(top.evlist);
1715         perf_session__delete(top.session);
1716 
1717         return status;
1718 }
1719 

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