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

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  1 /*
  2  * builtin-top.c
  3  *
  4  * Builtin top command: Display a continuously updated profile of
  5  * any workload, CPU or specific PID.
  6  *
  7  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  8  *               2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
  9  *
 10  * Improvements and fixes by:
 11  *
 12  *   Arjan van de Ven <arjan@linux.intel.com>
 13  *   Yanmin Zhang <yanmin.zhang@intel.com>
 14  *   Wu Fengguang <fengguang.wu@intel.com>
 15  *   Mike Galbraith <efault@gmx.de>
 16  *   Paul Mackerras <paulus@samba.org>
 17  *
 18  * Released under the GPL v2. (and only v2, not any later version)
 19  */
 20 #include "builtin.h"
 21 
 22 #include "perf.h"
 23 
 24 #include "util/annotate.h"
 25 #include "util/bpf-event.h"
 26 #include "util/config.h"
 27 #include "util/color.h"
 28 #include "util/evlist.h"
 29 #include "util/evsel.h"
 30 #include "util/event.h"
 31 #include "util/machine.h"
 32 #include "util/map.h"
 33 #include "util/session.h"
 34 #include "util/symbol.h"
 35 #include "util/thread.h"
 36 #include "util/thread_map.h"
 37 #include "util/top.h"
 38 #include <linux/rbtree.h>
 39 #include <subcmd/parse-options.h>
 40 #include "util/parse-events.h"
 41 #include "util/cpumap.h"
 42 #include "util/xyarray.h"
 43 #include "util/sort.h"
 44 #include "util/term.h"
 45 #include "util/intlist.h"
 46 #include "util/parse-branch-options.h"
 47 #include "arch/common.h"
 48 
 49 #include "util/debug.h"
 50 #include "util/ordered-events.h"
 51 
 52 #include <assert.h>
 53 #include <elf.h>
 54 #include <fcntl.h>
 55 
 56 #include <stdio.h>
 57 #include <termios.h>
 58 #include <unistd.h>
 59 #include <inttypes.h>
 60 
 61 #include <errno.h>
 62 #include <time.h>
 63 #include <sched.h>
 64 #include <signal.h>
 65 
 66 #include <sys/syscall.h>
 67 #include <sys/ioctl.h>
 68 #include <poll.h>
 69 #include <sys/prctl.h>
 70 #include <sys/wait.h>
 71 #include <sys/uio.h>
 72 #include <sys/utsname.h>
 73 #include <sys/mman.h>
 74 
 75 #include <linux/stringify.h>
 76 #include <linux/time64.h>
 77 #include <linux/types.h>
 78 
 79 #include "sane_ctype.h"
 80 
 81 static volatile int done;
 82 static volatile int resize;
 83 
 84 #define HEADER_LINE_NR  5
 85 
 86 static void perf_top__update_print_entries(struct perf_top *top)
 87 {
 88         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
 89 }
 90 
 91 static void winch_sig(int sig __maybe_unused)
 92 {
 93         resize = 1;
 94 }
 95 
 96 static void perf_top__resize(struct perf_top *top)
 97 {
 98         get_term_dimensions(&top->winsize);
 99         perf_top__update_print_entries(top);
100 }
101 
102 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
103 {
104         struct perf_evsel *evsel = hists_to_evsel(he->hists);
105         struct symbol *sym;
106         struct annotation *notes;
107         struct map *map;
108         int err = -1;
109 
110         if (!he || !he->ms.sym)
111                 return -1;
112 
113         sym = he->ms.sym;
114         map = he->ms.map;
115 
116         /*
117          * We can't annotate with just /proc/kallsyms
118          */
119         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
120             !dso__is_kcore(map->dso)) {
121                 pr_err("Can't annotate %s: No vmlinux file was found in the "
122                        "path\n", sym->name);
123                 sleep(1);
124                 return -1;
125         }
126 
127         notes = symbol__annotation(sym);
128         pthread_mutex_lock(&notes->lock);
129 
130         if (!symbol__hists(sym, top->evlist->nr_entries)) {
131                 pthread_mutex_unlock(&notes->lock);
132                 pr_err("Not enough memory for annotating '%s' symbol!\n",
133                        sym->name);
134                 sleep(1);
135                 return err;
136         }
137 
138         err = symbol__annotate(sym, map, evsel, 0, &top->annotation_opts, NULL);
139         if (err == 0) {
140                 top->sym_filter_entry = he;
141         } else {
142                 char msg[BUFSIZ];
143                 symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));
144                 pr_err("Couldn't annotate %s: %s\n", sym->name, msg);
145         }
146 
147         pthread_mutex_unlock(&notes->lock);
148         return err;
149 }
150 
151 static void __zero_source_counters(struct hist_entry *he)
152 {
153         struct symbol *sym = he->ms.sym;
154         symbol__annotate_zero_histograms(sym);
155 }
156 
157 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
158 {
159         struct utsname uts;
160         int err = uname(&uts);
161 
162         ui__warning("Out of bounds address found:\n\n"
163                     "Addr:   %" PRIx64 "\n"
164                     "DSO:    %s %c\n"
165                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
166                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
167                     "Arch:   %s\n"
168                     "Kernel: %s\n"
169                     "Tools:  %s\n\n"
170                     "Not all samples will be on the annotation output.\n\n"
171                     "Please report to linux-kernel@vger.kernel.org\n",
172                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
173                     map->start, map->end, sym->start, sym->end,
174                     sym->binding == STB_GLOBAL ? 'g' :
175                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
176                     err ? "[unknown]" : uts.machine,
177                     err ? "[unknown]" : uts.release, perf_version_string);
178         if (use_browser <= 0)
179                 sleep(5);
180 
181         map->erange_warned = true;
182 }
183 
184 static void perf_top__record_precise_ip(struct perf_top *top,
185                                         struct hist_entry *he,
186                                         struct perf_sample *sample,
187                                         struct perf_evsel *evsel, u64 ip)
188 {
189         struct annotation *notes;
190         struct symbol *sym = he->ms.sym;
191         int err = 0;
192 
193         if (sym == NULL || (use_browser == 0 &&
194                             (top->sym_filter_entry == NULL ||
195                              top->sym_filter_entry->ms.sym != sym)))
196                 return;
197 
198         notes = symbol__annotation(sym);
199 
200         if (pthread_mutex_trylock(&notes->lock))
201                 return;
202 
203         err = hist_entry__inc_addr_samples(he, sample, evsel, ip);
204 
205         pthread_mutex_unlock(&notes->lock);
206 
207         if (unlikely(err)) {
208                 /*
209                  * This function is now called with he->hists->lock held.
210                  * Release it before going to sleep.
211                  */
212                 pthread_mutex_unlock(&he->hists->lock);
213 
214                 if (err == -ERANGE && !he->ms.map->erange_warned)
215                         ui__warn_map_erange(he->ms.map, sym, ip);
216                 else if (err == -ENOMEM) {
217                         pr_err("Not enough memory for annotating '%s' symbol!\n",
218                                sym->name);
219                         sleep(1);
220                 }
221 
222                 pthread_mutex_lock(&he->hists->lock);
223         }
224 }
225 
226 static void perf_top__show_details(struct perf_top *top)
227 {
228         struct hist_entry *he = top->sym_filter_entry;
229         struct perf_evsel *evsel = hists_to_evsel(he->hists);
230         struct annotation *notes;
231         struct symbol *symbol;
232         int more;
233 
234         if (!he)
235                 return;
236 
237         symbol = he->ms.sym;
238         notes = symbol__annotation(symbol);
239 
240         pthread_mutex_lock(&notes->lock);
241 
242         symbol__calc_percent(symbol, evsel);
243 
244         if (notes->src == NULL)
245                 goto out_unlock;
246 
247         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
248         printf("  Events  Pcnt (>=%d%%)\n", top->annotation_opts.min_pcnt);
249 
250         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel, &top->annotation_opts);
251 
252         if (top->evlist->enabled) {
253                 if (top->zero)
254                         symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
255                 else
256                         symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
257         }
258         if (more != 0)
259                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
260 out_unlock:
261         pthread_mutex_unlock(&notes->lock);
262 }
263 
264 static void perf_top__print_sym_table(struct perf_top *top)
265 {
266         char bf[160];
267         int printed = 0;
268         const int win_width = top->winsize.ws_col - 1;
269         struct perf_evsel *evsel = top->sym_evsel;
270         struct hists *hists = evsel__hists(evsel);
271 
272         puts(CONSOLE_CLEAR);
273 
274         perf_top__header_snprintf(top, bf, sizeof(bf));
275         printf("%s\n", bf);
276 
277         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
278 
279         if (!top->record_opts.overwrite &&
280             (hists->stats.nr_lost_warned !=
281             hists->stats.nr_events[PERF_RECORD_LOST])) {
282                 hists->stats.nr_lost_warned =
283                               hists->stats.nr_events[PERF_RECORD_LOST];
284                 color_fprintf(stdout, PERF_COLOR_RED,
285                               "WARNING: LOST %d chunks, Check IO/CPU overload",
286                               hists->stats.nr_lost_warned);
287                 ++printed;
288         }
289 
290         if (top->sym_filter_entry) {
291                 perf_top__show_details(top);
292                 return;
293         }
294 
295         if (top->evlist->enabled) {
296                 if (top->zero) {
297                         hists__delete_entries(hists);
298                 } else {
299                         hists__decay_entries(hists, top->hide_user_symbols,
300                                              top->hide_kernel_symbols);
301                 }
302         }
303 
304         hists__collapse_resort(hists, NULL);
305         perf_evsel__output_resort(evsel, NULL);
306 
307         hists__output_recalc_col_len(hists, top->print_entries - printed);
308         putchar('\n');
309         hists__fprintf(hists, false, top->print_entries - printed, win_width,
310                        top->min_percent, stdout, !symbol_conf.use_callchain);
311 }
312 
313 static void prompt_integer(int *target, const char *msg)
314 {
315         char *buf = malloc(0), *p;
316         size_t dummy = 0;
317         int tmp;
318 
319         fprintf(stdout, "\n%s: ", msg);
320         if (getline(&buf, &dummy, stdin) < 0)
321                 return;
322 
323         p = strchr(buf, '\n');
324         if (p)
325                 *p = 0;
326 
327         p = buf;
328         while(*p) {
329                 if (!isdigit(*p))
330                         goto out_free;
331                 p++;
332         }
333         tmp = strtoul(buf, NULL, 10);
334         *target = tmp;
335 out_free:
336         free(buf);
337 }
338 
339 static void prompt_percent(int *target, const char *msg)
340 {
341         int tmp = 0;
342 
343         prompt_integer(&tmp, msg);
344         if (tmp >= 0 && tmp <= 100)
345                 *target = tmp;
346 }
347 
348 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
349 {
350         char *buf = malloc(0), *p;
351         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
352         struct hists *hists = evsel__hists(top->sym_evsel);
353         struct rb_node *next;
354         size_t dummy = 0;
355 
356         /* zero counters of active symbol */
357         if (syme) {
358                 __zero_source_counters(syme);
359                 top->sym_filter_entry = NULL;
360         }
361 
362         fprintf(stdout, "\n%s: ", msg);
363         if (getline(&buf, &dummy, stdin) < 0)
364                 goto out_free;
365 
366         p = strchr(buf, '\n');
367         if (p)
368                 *p = 0;
369 
370         next = rb_first_cached(&hists->entries);
371         while (next) {
372                 n = rb_entry(next, struct hist_entry, rb_node);
373                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
374                         found = n;
375                         break;
376                 }
377                 next = rb_next(&n->rb_node);
378         }
379 
380         if (!found) {
381                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
382                 sleep(1);
383         } else
384                 perf_top__parse_source(top, found);
385 
386 out_free:
387         free(buf);
388 }
389 
390 static void perf_top__print_mapped_keys(struct perf_top *top)
391 {
392         char *name = NULL;
393 
394         if (top->sym_filter_entry) {
395                 struct symbol *sym = top->sym_filter_entry->ms.sym;
396                 name = sym->name;
397         }
398 
399         fprintf(stdout, "\nMapped keys:\n");
400         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
401         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
402 
403         if (top->evlist->nr_entries > 1)
404                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
405 
406         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
407 
408         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->annotation_opts.min_pcnt);
409         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
410         fprintf(stdout, "\t[S]     stop annotation.\n");
411 
412         fprintf(stdout,
413                 "\t[K]     hide kernel symbols.             \t(%s)\n",
414                 top->hide_kernel_symbols ? "yes" : "no");
415         fprintf(stdout,
416                 "\t[U]     hide user symbols.               \t(%s)\n",
417                 top->hide_user_symbols ? "yes" : "no");
418         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
419         fprintf(stdout, "\t[qQ]    quit.\n");
420 }
421 
422 static int perf_top__key_mapped(struct perf_top *top, int c)
423 {
424         switch (c) {
425                 case 'd':
426                 case 'e':
427                 case 'f':
428                 case 'z':
429                 case 'q':
430                 case 'Q':
431                 case 'K':
432                 case 'U':
433                 case 'F':
434                 case 's':
435                 case 'S':
436                         return 1;
437                 case 'E':
438                         return top->evlist->nr_entries > 1 ? 1 : 0;
439                 default:
440                         break;
441         }
442 
443         return 0;
444 }
445 
446 static bool perf_top__handle_keypress(struct perf_top *top, int c)
447 {
448         bool ret = true;
449 
450         if (!perf_top__key_mapped(top, c)) {
451                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
452                 struct termios save;
453 
454                 perf_top__print_mapped_keys(top);
455                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
456                 fflush(stdout);
457 
458                 set_term_quiet_input(&save);
459 
460                 poll(&stdin_poll, 1, -1);
461                 c = getc(stdin);
462 
463                 tcsetattr(0, TCSAFLUSH, &save);
464                 if (!perf_top__key_mapped(top, c))
465                         return ret;
466         }
467 
468         switch (c) {
469                 case 'd':
470                         prompt_integer(&top->delay_secs, "Enter display delay");
471                         if (top->delay_secs < 1)
472                                 top->delay_secs = 1;
473                         break;
474                 case 'e':
475                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
476                         if (top->print_entries == 0) {
477                                 perf_top__resize(top);
478                                 signal(SIGWINCH, winch_sig);
479                         } else {
480                                 signal(SIGWINCH, SIG_DFL);
481                         }
482                         break;
483                 case 'E':
484                         if (top->evlist->nr_entries > 1) {
485                                 /* Select 0 as the default event: */
486                                 int counter = 0;
487 
488                                 fprintf(stderr, "\nAvailable events:");
489 
490                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
491                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
492 
493                                 prompt_integer(&counter, "Enter details event counter");
494 
495                                 if (counter >= top->evlist->nr_entries) {
496                                         top->sym_evsel = perf_evlist__first(top->evlist);
497                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
498                                         sleep(1);
499                                         break;
500                                 }
501                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
502                                         if (top->sym_evsel->idx == counter)
503                                                 break;
504                         } else
505                                 top->sym_evsel = perf_evlist__first(top->evlist);
506                         break;
507                 case 'f':
508                         prompt_integer(&top->count_filter, "Enter display event count filter");
509                         break;
510                 case 'F':
511                         prompt_percent(&top->annotation_opts.min_pcnt,
512                                        "Enter details display event filter (percent)");
513                         break;
514                 case 'K':
515                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
516                         break;
517                 case 'q':
518                 case 'Q':
519                         printf("exiting.\n");
520                         if (top->dump_symtab)
521                                 perf_session__fprintf_dsos(top->session, stderr);
522                         ret = false;
523                         break;
524                 case 's':
525                         perf_top__prompt_symbol(top, "Enter details symbol");
526                         break;
527                 case 'S':
528                         if (!top->sym_filter_entry)
529                                 break;
530                         else {
531                                 struct hist_entry *syme = top->sym_filter_entry;
532 
533                                 top->sym_filter_entry = NULL;
534                                 __zero_source_counters(syme);
535                         }
536                         break;
537                 case 'U':
538                         top->hide_user_symbols = !top->hide_user_symbols;
539                         break;
540                 case 'z':
541                         top->zero = !top->zero;
542                         break;
543                 default:
544                         break;
545         }
546 
547         return ret;
548 }
549 
550 static void perf_top__sort_new_samples(void *arg)
551 {
552         struct perf_top *t = arg;
553         struct perf_evsel *evsel = t->sym_evsel;
554         struct hists *hists;
555 
556         if (t->evlist->selected != NULL)
557                 t->sym_evsel = t->evlist->selected;
558 
559         hists = evsel__hists(evsel);
560 
561         if (t->evlist->enabled) {
562                 if (t->zero) {
563                         hists__delete_entries(hists);
564                 } else {
565                         hists__decay_entries(hists, t->hide_user_symbols,
566                                              t->hide_kernel_symbols);
567                 }
568         }
569 
570         hists__collapse_resort(hists, NULL);
571         perf_evsel__output_resort(evsel, NULL);
572 
573         if (t->lost || t->drop)
574                 pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n");
575 }
576 
577 static void stop_top(void)
578 {
579         session_done = 1;
580         done = 1;
581 }
582 
583 static void *display_thread_tui(void *arg)
584 {
585         struct perf_evsel *pos;
586         struct perf_top *top = arg;
587         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
588         struct hist_browser_timer hbt = {
589                 .timer          = perf_top__sort_new_samples,
590                 .arg            = top,
591                 .refresh        = top->delay_secs,
592         };
593 
594         /* In order to read symbols from other namespaces perf to  needs to call
595          * setns(2).  This isn't permitted if the struct_fs has multiple users.
596          * unshare(2) the fs so that we may continue to setns into namespaces
597          * that we're observing.
598          */
599         unshare(CLONE_FS);
600 
601         perf_top__sort_new_samples(top);
602 
603         /*
604          * Initialize the uid_filter_str, in the future the TUI will allow
605          * Zooming in/out UIDs. For now just use whatever the user passed
606          * via --uid.
607          */
608         evlist__for_each_entry(top->evlist, pos) {
609                 struct hists *hists = evsel__hists(pos);
610                 hists->uid_filter_str = top->record_opts.target.uid_str;
611         }
612 
613         perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
614                                       top->min_percent,
615                                       &top->session->header.env,
616                                       !top->record_opts.overwrite,
617                                       &top->annotation_opts);
618 
619         stop_top();
620         return NULL;
621 }
622 
623 static void display_sig(int sig __maybe_unused)
624 {
625         stop_top();
626 }
627 
628 static void display_setup_sig(void)
629 {
630         signal(SIGSEGV, sighandler_dump_stack);
631         signal(SIGFPE, sighandler_dump_stack);
632         signal(SIGINT,  display_sig);
633         signal(SIGQUIT, display_sig);
634         signal(SIGTERM, display_sig);
635 }
636 
637 static void *display_thread(void *arg)
638 {
639         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
640         struct termios save;
641         struct perf_top *top = arg;
642         int delay_msecs, c;
643 
644         /* In order to read symbols from other namespaces perf to  needs to call
645          * setns(2).  This isn't permitted if the struct_fs has multiple users.
646          * unshare(2) the fs so that we may continue to setns into namespaces
647          * that we're observing.
648          */
649         unshare(CLONE_FS);
650 
651         display_setup_sig();
652         pthread__unblock_sigwinch();
653 repeat:
654         delay_msecs = top->delay_secs * MSEC_PER_SEC;
655         set_term_quiet_input(&save);
656         /* trash return*/
657         getc(stdin);
658 
659         while (!done) {
660                 perf_top__print_sym_table(top);
661                 /*
662                  * Either timeout expired or we got an EINTR due to SIGWINCH,
663                  * refresh screen in both cases.
664                  */
665                 switch (poll(&stdin_poll, 1, delay_msecs)) {
666                 case 0:
667                         continue;
668                 case -1:
669                         if (errno == EINTR)
670                                 continue;
671                         __fallthrough;
672                 default:
673                         c = getc(stdin);
674                         tcsetattr(0, TCSAFLUSH, &save);
675 
676                         if (perf_top__handle_keypress(top, c))
677                                 goto repeat;
678                         stop_top();
679                 }
680         }
681 
682         tcsetattr(0, TCSAFLUSH, &save);
683         return NULL;
684 }
685 
686 static int hist_iter__top_callback(struct hist_entry_iter *iter,
687                                    struct addr_location *al, bool single,
688                                    void *arg)
689 {
690         struct perf_top *top = arg;
691         struct hist_entry *he = iter->he;
692         struct perf_evsel *evsel = iter->evsel;
693 
694         if (perf_hpp_list.sym && single)
695                 perf_top__record_precise_ip(top, he, iter->sample, evsel, al->addr);
696 
697         hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
698                      !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY));
699         return 0;
700 }
701 
702 static void perf_event__process_sample(struct perf_tool *tool,
703                                        const union perf_event *event,
704                                        struct perf_evsel *evsel,
705                                        struct perf_sample *sample,
706                                        struct machine *machine)
707 {
708         struct perf_top *top = container_of(tool, struct perf_top, tool);
709         struct addr_location al;
710         int err;
711 
712         if (!machine && perf_guest) {
713                 static struct intlist *seen;
714 
715                 if (!seen)
716                         seen = intlist__new(NULL);
717 
718                 if (!intlist__has_entry(seen, sample->pid)) {
719                         pr_err("Can't find guest [%d]'s kernel information\n",
720                                 sample->pid);
721                         intlist__add(seen, sample->pid);
722                 }
723                 return;
724         }
725 
726         if (!machine) {
727                 pr_err("%u unprocessable samples recorded.\r",
728                        top->session->evlist->stats.nr_unprocessable_samples++);
729                 return;
730         }
731 
732         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
733                 top->exact_samples++;
734 
735         if (machine__resolve(machine, &al, sample) < 0)
736                 return;
737 
738         if (!machine->kptr_restrict_warned &&
739             symbol_conf.kptr_restrict &&
740             al.cpumode == PERF_RECORD_MISC_KERNEL) {
741                 if (!perf_evlist__exclude_kernel(top->session->evlist)) {
742                         ui__warning(
743 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
744 "Check /proc/sys/kernel/kptr_restrict.\n\n"
745 "Kernel%s samples will not be resolved.\n",
746                           al.map && map__has_symbols(al.map) ?
747                           " modules" : "");
748                         if (use_browser <= 0)
749                                 sleep(5);
750                 }
751                 machine->kptr_restrict_warned = true;
752         }
753 
754         if (al.sym == NULL && al.map != NULL) {
755                 const char *msg = "Kernel samples will not be resolved.\n";
756                 /*
757                  * As we do lazy loading of symtabs we only will know if the
758                  * specified vmlinux file is invalid when we actually have a
759                  * hit in kernel space and then try to load it. So if we get
760                  * here and there are _no_ symbols in the DSO backing the
761                  * kernel map, bail out.
762                  *
763                  * We may never get here, for instance, if we use -K/
764                  * --hide-kernel-symbols, even if the user specifies an
765                  * invalid --vmlinux ;-)
766                  */
767                 if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
768                     __map__is_kernel(al.map) && map__has_symbols(al.map)) {
769                         if (symbol_conf.vmlinux_name) {
770                                 char serr[256];
771                                 dso__strerror_load(al.map->dso, serr, sizeof(serr));
772                                 ui__warning("The %s file can't be used: %s\n%s",
773                                             symbol_conf.vmlinux_name, serr, msg);
774                         } else {
775                                 ui__warning("A vmlinux file was not found.\n%s",
776                                             msg);
777                         }
778 
779                         if (use_browser <= 0)
780                                 sleep(5);
781                         top->vmlinux_warned = true;
782                 }
783         }
784 
785         if (al.sym == NULL || !al.sym->idle) {
786                 struct hists *hists = evsel__hists(evsel);
787                 struct hist_entry_iter iter = {
788                         .evsel          = evsel,
789                         .sample         = sample,
790                         .add_entry_cb   = hist_iter__top_callback,
791                 };
792 
793                 if (symbol_conf.cumulate_callchain)
794                         iter.ops = &hist_iter_cumulative;
795                 else
796                         iter.ops = &hist_iter_normal;
797 
798                 pthread_mutex_lock(&hists->lock);
799 
800                 err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
801                 if (err < 0)
802                         pr_err("Problem incrementing symbol period, skipping event\n");
803 
804                 pthread_mutex_unlock(&hists->lock);
805         }
806 
807         addr_location__put(&al);
808 }
809 
810 static void
811 perf_top__process_lost(struct perf_top *top, union perf_event *event,
812                        struct perf_evsel *evsel)
813 {
814         struct hists *hists = evsel__hists(evsel);
815 
816         top->lost += event->lost.lost;
817         top->lost_total += event->lost.lost;
818         hists->stats.total_lost += event->lost.lost;
819 }
820 
821 static void
822 perf_top__process_lost_samples(struct perf_top *top,
823                                union perf_event *event,
824                                struct perf_evsel *evsel)
825 {
826         struct hists *hists = evsel__hists(evsel);
827 
828         top->lost += event->lost_samples.lost;
829         top->lost_total += event->lost_samples.lost;
830         hists->stats.total_lost_samples += event->lost_samples.lost;
831 }
832 
833 static u64 last_timestamp;
834 
835 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
836 {
837         struct record_opts *opts = &top->record_opts;
838         struct perf_evlist *evlist = top->evlist;
839         struct perf_mmap *md;
840         union perf_event *event;
841 
842         md = opts->overwrite ? &evlist->overwrite_mmap[idx] : &evlist->mmap[idx];
843         if (perf_mmap__read_init(md) < 0)
844                 return;
845 
846         while ((event = perf_mmap__read_event(md)) != NULL) {
847                 int ret;
848 
849                 ret = perf_evlist__parse_sample_timestamp(evlist, event, &last_timestamp);
850                 if (ret && ret != -1)
851                         break;
852 
853                 ret = ordered_events__queue(top->qe.in, event, last_timestamp, 0);
854                 if (ret)
855                         break;
856 
857                 perf_mmap__consume(md);
858 
859                 if (top->qe.rotate) {
860                         pthread_mutex_lock(&top->qe.mutex);
861                         top->qe.rotate = false;
862                         pthread_cond_signal(&top->qe.cond);
863                         pthread_mutex_unlock(&top->qe.mutex);
864                 }
865         }
866 
867         perf_mmap__read_done(md);
868 }
869 
870 static void perf_top__mmap_read(struct perf_top *top)
871 {
872         bool overwrite = top->record_opts.overwrite;
873         struct perf_evlist *evlist = top->evlist;
874         int i;
875 
876         if (overwrite)
877                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
878 
879         for (i = 0; i < top->evlist->nr_mmaps; i++)
880                 perf_top__mmap_read_idx(top, i);
881 
882         if (overwrite) {
883                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
884                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
885         }
886 }
887 
888 /*
889  * Check per-event overwrite term.
890  * perf top should support consistent term for all events.
891  * - All events don't have per-event term
892  *   E.g. "cpu/cpu-cycles/,cpu/instructions/"
893  *   Nothing change, return 0.
894  * - All events have same per-event term
895  *   E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
896  *   Using the per-event setting to replace the opts->overwrite if
897  *   they are different, then return 0.
898  * - Events have different per-event term
899  *   E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
900  *   Return -1
901  * - Some of the event set per-event term, but some not.
902  *   E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
903  *   Return -1
904  */
905 static int perf_top__overwrite_check(struct perf_top *top)
906 {
907         struct record_opts *opts = &top->record_opts;
908         struct perf_evlist *evlist = top->evlist;
909         struct perf_evsel_config_term *term;
910         struct list_head *config_terms;
911         struct perf_evsel *evsel;
912         int set, overwrite = -1;
913 
914         evlist__for_each_entry(evlist, evsel) {
915                 set = -1;
916                 config_terms = &evsel->config_terms;
917                 list_for_each_entry(term, config_terms, list) {
918                         if (term->type == PERF_EVSEL__CONFIG_TERM_OVERWRITE)
919                                 set = term->val.overwrite ? 1 : 0;
920                 }
921 
922                 /* no term for current and previous event (likely) */
923                 if ((overwrite < 0) && (set < 0))
924                         continue;
925 
926                 /* has term for both current and previous event, compare */
927                 if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
928                         return -1;
929 
930                 /* no term for current event but has term for previous one */
931                 if ((overwrite >= 0) && (set < 0))
932                         return -1;
933 
934                 /* has term for current event */
935                 if ((overwrite < 0) && (set >= 0)) {
936                         /* if it's first event, set overwrite */
937                         if (evsel == perf_evlist__first(evlist))
938                                 overwrite = set;
939                         else
940                                 return -1;
941                 }
942         }
943 
944         if ((overwrite >= 0) && (opts->overwrite != overwrite))
945                 opts->overwrite = overwrite;
946 
947         return 0;
948 }
949 
950 static int perf_top_overwrite_fallback(struct perf_top *top,
951                                        struct perf_evsel *evsel)
952 {
953         struct record_opts *opts = &top->record_opts;
954         struct perf_evlist *evlist = top->evlist;
955         struct perf_evsel *counter;
956 
957         if (!opts->overwrite)
958                 return 0;
959 
960         /* only fall back when first event fails */
961         if (evsel != perf_evlist__first(evlist))
962                 return 0;
963 
964         evlist__for_each_entry(evlist, counter)
965                 counter->attr.write_backward = false;
966         opts->overwrite = false;
967         pr_debug2("fall back to non-overwrite mode\n");
968         return 1;
969 }
970 
971 static int perf_top__start_counters(struct perf_top *top)
972 {
973         char msg[BUFSIZ];
974         struct perf_evsel *counter;
975         struct perf_evlist *evlist = top->evlist;
976         struct record_opts *opts = &top->record_opts;
977 
978         if (perf_top__overwrite_check(top)) {
979                 ui__error("perf top only support consistent per-event "
980                           "overwrite setting for all events\n");
981                 goto out_err;
982         }
983 
984         perf_evlist__config(evlist, opts, &callchain_param);
985 
986         evlist__for_each_entry(evlist, counter) {
987 try_again:
988                 if (perf_evsel__open(counter, top->evlist->cpus,
989                                      top->evlist->threads) < 0) {
990 
991                         /*
992                          * Specially handle overwrite fall back.
993                          * Because perf top is the only tool which has
994                          * overwrite mode by default, support
995                          * both overwrite and non-overwrite mode, and
996                          * require consistent mode for all events.
997                          *
998                          * May move it to generic code with more tools
999                          * have similar attribute.
1000                          */
1001                         if (perf_missing_features.write_backward &&
1002                             perf_top_overwrite_fallback(top, counter))
1003                                 goto try_again;
1004 
1005                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
1006                                 if (verbose > 0)
1007                                         ui__warning("%s\n", msg);
1008                                 goto try_again;
1009                         }
1010 
1011                         perf_evsel__open_strerror(counter, &opts->target,
1012                                                   errno, msg, sizeof(msg));
1013                         ui__error("%s\n", msg);
1014                         goto out_err;
1015                 }
1016         }
1017 
1018         if (perf_evlist__mmap(evlist, opts->mmap_pages) < 0) {
1019                 ui__error("Failed to mmap with %d (%s)\n",
1020                             errno, str_error_r(errno, msg, sizeof(msg)));
1021                 goto out_err;
1022         }
1023 
1024         return 0;
1025 
1026 out_err:
1027         return -1;
1028 }
1029 
1030 static int callchain_param__setup_sample_type(struct callchain_param *callchain)
1031 {
1032         if (callchain->mode != CHAIN_NONE) {
1033                 if (callchain_register_param(callchain) < 0) {
1034                         ui__error("Can't register callchain params.\n");
1035                         return -EINVAL;
1036                 }
1037         }
1038 
1039         return 0;
1040 }
1041 
1042 static struct ordered_events *rotate_queues(struct perf_top *top)
1043 {
1044         struct ordered_events *in = top->qe.in;
1045 
1046         if (top->qe.in == &top->qe.data[1])
1047                 top->qe.in = &top->qe.data[0];
1048         else
1049                 top->qe.in = &top->qe.data[1];
1050 
1051         return in;
1052 }
1053 
1054 static void *process_thread(void *arg)
1055 {
1056         struct perf_top *top = arg;
1057 
1058         while (!done) {
1059                 struct ordered_events *out, *in = top->qe.in;
1060 
1061                 if (!in->nr_events) {
1062                         usleep(100);
1063                         continue;
1064                 }
1065 
1066                 out = rotate_queues(top);
1067 
1068                 pthread_mutex_lock(&top->qe.mutex);
1069                 top->qe.rotate = true;
1070                 pthread_cond_wait(&top->qe.cond, &top->qe.mutex);
1071                 pthread_mutex_unlock(&top->qe.mutex);
1072 
1073                 if (ordered_events__flush(out, OE_FLUSH__TOP))
1074                         pr_err("failed to process events\n");
1075         }
1076 
1077         return NULL;
1078 }
1079 
1080 /*
1081  * Allow only 'top->delay_secs' seconds behind samples.
1082  */
1083 static int should_drop(struct ordered_event *qevent, struct perf_top *top)
1084 {
1085         union perf_event *event = qevent->event;
1086         u64 delay_timestamp;
1087 
1088         if (event->header.type != PERF_RECORD_SAMPLE)
1089                 return false;
1090 
1091         delay_timestamp = qevent->timestamp + top->delay_secs * NSEC_PER_SEC;
1092         return delay_timestamp < last_timestamp;
1093 }
1094 
1095 static int deliver_event(struct ordered_events *qe,
1096                          struct ordered_event *qevent)
1097 {
1098         struct perf_top *top = qe->data;
1099         struct perf_evlist *evlist = top->evlist;
1100         struct perf_session *session = top->session;
1101         union perf_event *event = qevent->event;
1102         struct perf_sample sample;
1103         struct perf_evsel *evsel;
1104         struct machine *machine;
1105         int ret = -1;
1106 
1107         if (should_drop(qevent, top)) {
1108                 top->drop++;
1109                 top->drop_total++;
1110                 return 0;
1111         }
1112 
1113         ret = perf_evlist__parse_sample(evlist, event, &sample);
1114         if (ret) {
1115                 pr_err("Can't parse sample, err = %d\n", ret);
1116                 goto next_event;
1117         }
1118 
1119         evsel = perf_evlist__id2evsel(session->evlist, sample.id);
1120         assert(evsel != NULL);
1121 
1122         if (event->header.type == PERF_RECORD_SAMPLE)
1123                 ++top->samples;
1124 
1125         switch (sample.cpumode) {
1126         case PERF_RECORD_MISC_USER:
1127                 ++top->us_samples;
1128                 if (top->hide_user_symbols)
1129                         goto next_event;
1130                 machine = &session->machines.host;
1131                 break;
1132         case PERF_RECORD_MISC_KERNEL:
1133                 ++top->kernel_samples;
1134                 if (top->hide_kernel_symbols)
1135                         goto next_event;
1136                 machine = &session->machines.host;
1137                 break;
1138         case PERF_RECORD_MISC_GUEST_KERNEL:
1139                 ++top->guest_kernel_samples;
1140                 machine = perf_session__find_machine(session,
1141                                                      sample.pid);
1142                 break;
1143         case PERF_RECORD_MISC_GUEST_USER:
1144                 ++top->guest_us_samples;
1145                 /*
1146                  * TODO: we don't process guest user from host side
1147                  * except simple counting.
1148                  */
1149                 goto next_event;
1150         default:
1151                 if (event->header.type == PERF_RECORD_SAMPLE)
1152                         goto next_event;
1153                 machine = &session->machines.host;
1154                 break;
1155         }
1156 
1157         if (event->header.type == PERF_RECORD_SAMPLE) {
1158                 perf_event__process_sample(&top->tool, event, evsel,
1159                                            &sample, machine);
1160         } else if (event->header.type == PERF_RECORD_LOST) {
1161                 perf_top__process_lost(top, event, evsel);
1162         } else if (event->header.type == PERF_RECORD_LOST_SAMPLES) {
1163                 perf_top__process_lost_samples(top, event, evsel);
1164         } else if (event->header.type < PERF_RECORD_MAX) {
1165                 hists__inc_nr_events(evsel__hists(evsel), event->header.type);
1166                 machine__process_event(machine, event, &sample);
1167         } else
1168                 ++session->evlist->stats.nr_unknown_events;
1169 
1170         ret = 0;
1171 next_event:
1172         return ret;
1173 }
1174 
1175 static void init_process_thread(struct perf_top *top)
1176 {
1177         ordered_events__init(&top->qe.data[0], deliver_event, top);
1178         ordered_events__init(&top->qe.data[1], deliver_event, top);
1179         ordered_events__set_copy_on_queue(&top->qe.data[0], true);
1180         ordered_events__set_copy_on_queue(&top->qe.data[1], true);
1181         top->qe.in = &top->qe.data[0];
1182         pthread_mutex_init(&top->qe.mutex, NULL);
1183         pthread_cond_init(&top->qe.cond, NULL);
1184 }
1185 
1186 static int __cmd_top(struct perf_top *top)
1187 {
1188         struct record_opts *opts = &top->record_opts;
1189         pthread_t thread, thread_process;
1190         int ret;
1191 
1192         if (!top->annotation_opts.objdump_path) {
1193                 ret = perf_env__lookup_objdump(&top->session->header.env,
1194                                                &top->annotation_opts.objdump_path);
1195                 if (ret)
1196                         return ret;
1197         }
1198 
1199         ret = callchain_param__setup_sample_type(&callchain_param);
1200         if (ret)
1201                 return ret;
1202 
1203         if (perf_session__register_idle_thread(top->session) < 0)
1204                 return ret;
1205 
1206         if (top->nr_threads_synthesize > 1)
1207                 perf_set_multithreaded();
1208 
1209         init_process_thread(top);
1210 
1211         ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
1212                                                 &top->session->machines.host,
1213                                                 &top->record_opts);
1214         if (ret < 0)
1215                 pr_warning("Couldn't synthesize bpf events.\n");
1216 
1217         machine__synthesize_threads(&top->session->machines.host, &opts->target,
1218                                     top->evlist->threads, false,
1219                                     top->nr_threads_synthesize);
1220 
1221         if (top->nr_threads_synthesize > 1)
1222                 perf_set_singlethreaded();
1223 
1224         if (perf_hpp_list.socket) {
1225                 ret = perf_env__read_cpu_topology_map(&perf_env);
1226                 if (ret < 0) {
1227                         char errbuf[BUFSIZ];
1228                         const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
1229 
1230                         ui__error("Could not read the CPU topology map: %s\n", err);
1231                         return ret;
1232                 }
1233         }
1234 
1235         ret = perf_top__start_counters(top);
1236         if (ret)
1237                 return ret;
1238 
1239         top->session->evlist = top->evlist;
1240         perf_session__set_id_hdr_size(top->session);
1241 
1242         /*
1243          * When perf is starting the traced process, all the events (apart from
1244          * group members) have enable_on_exec=1 set, so don't spoil it by
1245          * prematurely enabling them.
1246          *
1247          * XXX 'top' still doesn't start workloads like record, trace, but should,
1248          * so leave the check here.
1249          */
1250         if (!target__none(&opts->target))
1251                 perf_evlist__enable(top->evlist);
1252 
1253         ret = -1;
1254         if (pthread_create(&thread_process, NULL, process_thread, top)) {
1255                 ui__error("Could not create process thread.\n");
1256                 return ret;
1257         }
1258 
1259         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1260                                                             display_thread), top)) {
1261                 ui__error("Could not create display thread.\n");
1262                 goto out_join_thread;
1263         }
1264 
1265         if (top->realtime_prio) {
1266                 struct sched_param param;
1267 
1268                 param.sched_priority = top->realtime_prio;
1269                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1270                         ui__error("Could not set realtime priority.\n");
1271                         goto out_join;
1272                 }
1273         }
1274 
1275         /* Wait for a minimal set of events before starting the snapshot */
1276         perf_evlist__poll(top->evlist, 100);
1277 
1278         perf_top__mmap_read(top);
1279 
1280         while (!done) {
1281                 u64 hits = top->samples;
1282 
1283                 perf_top__mmap_read(top);
1284 
1285                 if (opts->overwrite || (hits == top->samples))
1286                         ret = perf_evlist__poll(top->evlist, 100);
1287 
1288                 if (resize) {
1289                         perf_top__resize(top);
1290                         resize = 0;
1291                 }
1292         }
1293 
1294         ret = 0;
1295 out_join:
1296         pthread_join(thread, NULL);
1297 out_join_thread:
1298         pthread_cond_signal(&top->qe.cond);
1299         pthread_join(thread_process, NULL);
1300         return ret;
1301 }
1302 
1303 static int
1304 callchain_opt(const struct option *opt, const char *arg, int unset)
1305 {
1306         symbol_conf.use_callchain = true;
1307         return record_callchain_opt(opt, arg, unset);
1308 }
1309 
1310 static int
1311 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1312 {
1313         struct callchain_param *callchain = opt->value;
1314 
1315         callchain->enabled = !unset;
1316         callchain->record_mode = CALLCHAIN_FP;
1317 
1318         /*
1319          * --no-call-graph
1320          */
1321         if (unset) {
1322                 symbol_conf.use_callchain = false;
1323                 callchain->record_mode = CALLCHAIN_NONE;
1324                 return 0;
1325         }
1326 
1327         return parse_callchain_top_opt(arg);
1328 }
1329 
1330 static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
1331 {
1332         if (!strcmp(var, "top.call-graph")) {
1333                 var = "call-graph.record-mode";
1334                 return perf_default_config(var, value, cb);
1335         }
1336         if (!strcmp(var, "top.children")) {
1337                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1338                 return 0;
1339         }
1340 
1341         return 0;
1342 }
1343 
1344 static int
1345 parse_percent_limit(const struct option *opt, const char *arg,
1346                     int unset __maybe_unused)
1347 {
1348         struct perf_top *top = opt->value;
1349 
1350         top->min_percent = strtof(arg, NULL);
1351         return 0;
1352 }
1353 
1354 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1355         "\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1356 
1357 int cmd_top(int argc, const char **argv)
1358 {
1359         char errbuf[BUFSIZ];
1360         struct perf_top top = {
1361                 .count_filter        = 5,
1362                 .delay_secs          = 2,
1363                 .record_opts = {
1364                         .mmap_pages     = UINT_MAX,
1365                         .user_freq      = UINT_MAX,
1366                         .user_interval  = ULLONG_MAX,
1367                         .freq           = 4000, /* 4 KHz */
1368                         .target         = {
1369                                 .uses_mmap   = true,
1370                         },
1371                         /*
1372                          * FIXME: This will lose PERF_RECORD_MMAP and other metadata
1373                          * when we pause, fix that and reenable. Probably using a
1374                          * separate evlist with a dummy event, i.e. a non-overwrite
1375                          * ring buffer just for metadata events, while PERF_RECORD_SAMPLE
1376                          * stays in overwrite mode. -acme
1377                          * */
1378                         .overwrite      = 0,
1379                         .sample_time    = true,
1380                         .sample_time_set = true,
1381                 },
1382                 .max_stack           = sysctl__max_stack(),
1383                 .annotation_opts     = annotation__default_options,
1384                 .nr_threads_synthesize = UINT_MAX,
1385         };
1386         struct record_opts *opts = &top.record_opts;
1387         struct target *target = &opts->target;
1388         const struct option options[] = {
1389         OPT_CALLBACK('e', "event", &top.evlist, "event",
1390                      "event selector. use 'perf list' to list available events",
1391                      parse_events_option),
1392         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1393         OPT_STRING('p', "pid", &target->pid, "pid",
1394                     "profile events on existing process id"),
1395         OPT_STRING('t', "tid", &target->tid, "tid",
1396                     "profile events on existing thread id"),
1397         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1398                             "system-wide collection from all CPUs"),
1399         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1400                     "list of cpus to monitor"),
1401         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1402                    "file", "vmlinux pathname"),
1403         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1404                     "don't load vmlinux even if found"),
1405         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1406                    "file", "kallsyms pathname"),
1407         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1408                     "hide kernel symbols"),
1409         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1410                      "number of mmap data pages",
1411                      perf_evlist__parse_mmap_pages),
1412         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1413                     "collect data with this RT SCHED_FIFO priority"),
1414         OPT_INTEGER('d', "delay", &top.delay_secs,
1415                     "number of seconds to delay between refreshes"),
1416         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1417                             "dump the symbol table used for profiling"),
1418         OPT_INTEGER('f', "count-filter", &top.count_filter,
1419                     "only display functions with more events than this"),
1420         OPT_BOOLEAN(0, "group", &opts->group,
1421                             "put the counters into a counter group"),
1422         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1423                     "child tasks do not inherit counters"),
1424         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1425                     "symbol to annotate"),
1426         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1427         OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
1428                      "profile at this frequency",
1429                       record__parse_freq),
1430         OPT_INTEGER('E', "entries", &top.print_entries,
1431                     "display this many functions"),
1432         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1433                     "hide user symbols"),
1434         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1435         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1436         OPT_INCR('v', "verbose", &verbose,
1437                     "be more verbose (show counter open errors, etc)"),
1438         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1439                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1440                    " Please refer the man page for the complete list."),
1441         OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1442                    "output field(s): overhead, period, sample plus all of sort keys"),
1443         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1444                     "Show a column with the number of samples"),
1445         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1446                            NULL, "enables call-graph recording and display",
1447                            &callchain_opt),
1448         OPT_CALLBACK(0, "call-graph", &callchain_param,
1449                      "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1450                      top_callchain_help, &parse_callchain_opt),
1451         OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1452                     "Accumulate callchains of children and show total overhead as well"),
1453         OPT_INTEGER(0, "max-stack", &top.max_stack,
1454                     "Set the maximum stack depth when parsing the callchain. "
1455                     "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
1456         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1457                    "ignore callees of these functions in call graphs",
1458                    report_parse_ignore_callees_opt),
1459         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1460                     "Show a column with the sum of periods"),
1461         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1462                    "only consider symbols in these dsos"),
1463         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1464                    "only consider symbols in these comms"),
1465         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1466                    "only consider these symbols"),
1467         OPT_BOOLEAN(0, "source", &top.annotation_opts.annotate_src,
1468                     "Interleave source code with assembly code (default)"),
1469         OPT_BOOLEAN(0, "asm-raw", &top.annotation_opts.show_asm_raw,
1470                     "Display raw encoding of assembly instructions (default)"),
1471         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1472                     "Enable kernel symbol demangling"),
1473         OPT_BOOLEAN(0, "no-bpf-event", &top.record_opts.no_bpf_event, "do not record bpf events"),
1474         OPT_STRING(0, "objdump", &top.annotation_opts.objdump_path, "path",
1475                     "objdump binary to use for disassembly and annotations"),
1476         OPT_STRING('M', "disassembler-style", &top.annotation_opts.disassembler_style, "disassembler style",
1477                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1478         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1479         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1480                      "Don't show entries under that percent", parse_percent_limit),
1481         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1482                      "How to display percentage of filtered entries", parse_filter_percentage),
1483         OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1484                    "width[,width...]",
1485                    "don't try to adjust column width, use these fixed values"),
1486         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1487                         "per thread proc mmap processing timeout in ms"),
1488         OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1489                      "branch any", "sample any taken branches",
1490                      parse_branch_stack),
1491         OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1492                      "branch filter mask", "branch stack filter modes",
1493                      parse_branch_stack),
1494         OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1495                     "Show raw trace event output (do not use print fmt or plugins)"),
1496         OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
1497                     "Show entries in a hierarchy"),
1498         OPT_BOOLEAN(0, "overwrite", &top.record_opts.overwrite,
1499                     "Use a backward ring buffer, default: no"),
1500         OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
1501         OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
1502                         "number of thread to run event synthesize"),
1503         OPT_END()
1504         };
1505         struct perf_evlist *sb_evlist = NULL;
1506         const char * const top_usage[] = {
1507                 "perf top [<options>]",
1508                 NULL
1509         };
1510         int status = hists__init();
1511 
1512         if (status < 0)
1513                 return status;
1514 
1515         top.annotation_opts.min_pcnt = 5;
1516         top.annotation_opts.context  = 4;
1517 
1518         top.evlist = perf_evlist__new();
1519         if (top.evlist == NULL)
1520                 return -ENOMEM;
1521 
1522         status = perf_config(perf_top_config, &top);
1523         if (status)
1524                 return status;
1525 
1526         argc = parse_options(argc, argv, options, top_usage, 0);
1527         if (argc)
1528                 usage_with_options(top_usage, options);
1529 
1530         if (!top.evlist->nr_entries &&
1531             perf_evlist__add_default(top.evlist) < 0) {
1532                 pr_err("Not enough memory for event selector list\n");
1533                 goto out_delete_evlist;
1534         }
1535 
1536         if (symbol_conf.report_hierarchy) {
1537                 /* disable incompatible options */
1538                 symbol_conf.event_group = false;
1539                 symbol_conf.cumulate_callchain = false;
1540 
1541                 if (field_order) {
1542                         pr_err("Error: --hierarchy and --fields options cannot be used together\n");
1543                         parse_options_usage(top_usage, options, "fields", 0);
1544                         parse_options_usage(NULL, options, "hierarchy", 0);
1545                         goto out_delete_evlist;
1546                 }
1547         }
1548 
1549         if (opts->branch_stack && callchain_param.enabled)
1550                 symbol_conf.show_branchflag_count = true;
1551 
1552         sort__mode = SORT_MODE__TOP;
1553         /* display thread wants entries to be collapsed in a different tree */
1554         perf_hpp_list.need_collapse = 1;
1555 
1556         if (top.use_stdio)
1557                 use_browser = 0;
1558         else if (top.use_tui)
1559                 use_browser = 1;
1560 
1561         setup_browser(false);
1562 
1563         if (setup_sorting(top.evlist) < 0) {
1564                 if (sort_order)
1565                         parse_options_usage(top_usage, options, "s", 1);
1566                 if (field_order)
1567                         parse_options_usage(sort_order ? NULL : top_usage,
1568                                             options, "fields", 0);
1569                 goto out_delete_evlist;
1570         }
1571 
1572         status = target__validate(target);
1573         if (status) {
1574                 target__strerror(target, status, errbuf, BUFSIZ);
1575                 ui__warning("%s\n", errbuf);
1576         }
1577 
1578         status = target__parse_uid(target);
1579         if (status) {
1580                 int saved_errno = errno;
1581 
1582                 target__strerror(target, status, errbuf, BUFSIZ);
1583                 ui__error("%s\n", errbuf);
1584 
1585                 status = -saved_errno;
1586                 goto out_delete_evlist;
1587         }
1588 
1589         if (target__none(target))
1590                 target->system_wide = true;
1591 
1592         if (perf_evlist__create_maps(top.evlist, target) < 0) {
1593                 ui__error("Couldn't create thread/CPU maps: %s\n",
1594                           errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
1595                 goto out_delete_evlist;
1596         }
1597 
1598         if (top.delay_secs < 1)
1599                 top.delay_secs = 1;
1600 
1601         if (record_opts__config(opts)) {
1602                 status = -EINVAL;
1603                 goto out_delete_evlist;
1604         }
1605 
1606         top.sym_evsel = perf_evlist__first(top.evlist);
1607 
1608         if (!callchain_param.enabled) {
1609                 symbol_conf.cumulate_callchain = false;
1610                 perf_hpp__cancel_cumulate();
1611         }
1612 
1613         if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1614                 callchain_param.order = ORDER_CALLER;
1615 
1616         status = symbol__annotation_init();
1617         if (status < 0)
1618                 goto out_delete_evlist;
1619 
1620         annotation_config__init();
1621 
1622         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1623         status = symbol__init(NULL);
1624         if (status < 0)
1625                 goto out_delete_evlist;
1626 
1627         sort__setup_elide(stdout);
1628 
1629         get_term_dimensions(&top.winsize);
1630         if (top.print_entries == 0) {
1631                 perf_top__update_print_entries(&top);
1632                 signal(SIGWINCH, winch_sig);
1633         }
1634 
1635         top.session = perf_session__new(NULL, false, NULL);
1636         if (top.session == NULL) {
1637                 status = -1;
1638                 goto out_delete_evlist;
1639         }
1640 
1641         if (!top.record_opts.no_bpf_event)
1642                 bpf_event__add_sb_event(&sb_evlist, &perf_env);
1643 
1644         if (perf_evlist__start_sb_thread(sb_evlist, target)) {
1645                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1646                 opts->no_bpf_event = true;
1647         }
1648 
1649         status = __cmd_top(&top);
1650 
1651         if (!opts->no_bpf_event)
1652                 perf_evlist__stop_sb_thread(sb_evlist);
1653 
1654 out_delete_evlist:
1655         perf_evlist__delete(top.evlist);
1656         perf_session__delete(top.session);
1657 
1658         return status;
1659 }
1660 

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