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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/cache.h"
 26 #include "util/color.h"
 27 #include "util/evlist.h"
 28 #include "util/evsel.h"
 29 #include "util/machine.h"
 30 #include "util/session.h"
 31 #include "util/symbol.h"
 32 #include "util/thread.h"
 33 #include "util/thread_map.h"
 34 #include "util/top.h"
 35 #include "util/util.h"
 36 #include <linux/rbtree.h>
 37 #include "util/parse-options.h"
 38 #include "util/parse-events.h"
 39 #include "util/cpumap.h"
 40 #include "util/xyarray.h"
 41 #include "util/sort.h"
 42 #include "util/intlist.h"
 43 
 44 #include "util/debug.h"
 45 
 46 #include <assert.h>
 47 #include <elf.h>
 48 #include <fcntl.h>
 49 
 50 #include <stdio.h>
 51 #include <termios.h>
 52 #include <unistd.h>
 53 #include <inttypes.h>
 54 
 55 #include <errno.h>
 56 #include <time.h>
 57 #include <sched.h>
 58 
 59 #include <sys/syscall.h>
 60 #include <sys/ioctl.h>
 61 #include <sys/poll.h>
 62 #include <sys/prctl.h>
 63 #include <sys/wait.h>
 64 #include <sys/uio.h>
 65 #include <sys/utsname.h>
 66 #include <sys/mman.h>
 67 
 68 #include <linux/unistd.h>
 69 #include <linux/types.h>
 70 
 71 static volatile int done;
 72 
 73 static void perf_top__update_print_entries(struct perf_top *top)
 74 {
 75         if (top->print_entries > 9)
 76                 top->print_entries -= 9;
 77 }
 78 
 79 static void perf_top__sig_winch(int sig __maybe_unused,
 80                                 siginfo_t *info __maybe_unused, void *arg)
 81 {
 82         struct perf_top *top = arg;
 83 
 84         get_term_dimensions(&top->winsize);
 85         if (!top->print_entries
 86             || (top->print_entries+4) > top->winsize.ws_row) {
 87                 top->print_entries = top->winsize.ws_row;
 88         } else {
 89                 top->print_entries += 4;
 90                 top->winsize.ws_row = top->print_entries;
 91         }
 92         perf_top__update_print_entries(top);
 93 }
 94 
 95 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 96 {
 97         struct symbol *sym;
 98         struct annotation *notes;
 99         struct map *map;
100         int err = -1;
101 
102         if (!he || !he->ms.sym)
103                 return -1;
104 
105         sym = he->ms.sym;
106         map = he->ms.map;
107 
108         /*
109          * We can't annotate with just /proc/kallsyms
110          */
111         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
112                 pr_err("Can't annotate %s: No vmlinux file was found in the "
113                        "path\n", sym->name);
114                 sleep(1);
115                 return -1;
116         }
117 
118         notes = symbol__annotation(sym);
119         if (notes->src != NULL) {
120                 pthread_mutex_lock(&notes->lock);
121                 goto out_assign;
122         }
123 
124         pthread_mutex_lock(&notes->lock);
125 
126         if (symbol__alloc_hist(sym) < 0) {
127                 pthread_mutex_unlock(&notes->lock);
128                 pr_err("Not enough memory for annotating '%s' symbol!\n",
129                        sym->name);
130                 sleep(1);
131                 return err;
132         }
133 
134         err = symbol__annotate(sym, map, 0);
135         if (err == 0) {
136 out_assign:
137                 top->sym_filter_entry = he;
138         }
139 
140         pthread_mutex_unlock(&notes->lock);
141         return err;
142 }
143 
144 static void __zero_source_counters(struct hist_entry *he)
145 {
146         struct symbol *sym = he->ms.sym;
147         symbol__annotate_zero_histograms(sym);
148 }
149 
150 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
151 {
152         struct utsname uts;
153         int err = uname(&uts);
154 
155         ui__warning("Out of bounds address found:\n\n"
156                     "Addr:   %" PRIx64 "\n"
157                     "DSO:    %s %c\n"
158                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
159                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
160                     "Arch:   %s\n"
161                     "Kernel: %s\n"
162                     "Tools:  %s\n\n"
163                     "Not all samples will be on the annotation output.\n\n"
164                     "Please report to linux-kernel@vger.kernel.org\n",
165                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
166                     map->start, map->end, sym->start, sym->end,
167                     sym->binding == STB_GLOBAL ? 'g' :
168                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
169                     err ? "[unknown]" : uts.machine,
170                     err ? "[unknown]" : uts.release, perf_version_string);
171         if (use_browser <= 0)
172                 sleep(5);
173         
174         map->erange_warned = true;
175 }
176 
177 static void perf_top__record_precise_ip(struct perf_top *top,
178                                         struct hist_entry *he,
179                                         int counter, u64 ip)
180 {
181         struct annotation *notes;
182         struct symbol *sym;
183         int err;
184 
185         if (he == NULL || he->ms.sym == NULL ||
186             ((top->sym_filter_entry == NULL ||
187               top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
188                 return;
189 
190         sym = he->ms.sym;
191         notes = symbol__annotation(sym);
192 
193         if (pthread_mutex_trylock(&notes->lock))
194                 return;
195 
196         if (notes->src == NULL && symbol__alloc_hist(sym) < 0) {
197                 pthread_mutex_unlock(&notes->lock);
198                 pr_err("Not enough memory for annotating '%s' symbol!\n",
199                        sym->name);
200                 sleep(1);
201                 return;
202         }
203 
204         ip = he->ms.map->map_ip(he->ms.map, ip);
205         err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
206 
207         pthread_mutex_unlock(&notes->lock);
208 
209         if (err == -ERANGE && !he->ms.map->erange_warned)
210                 ui__warn_map_erange(he->ms.map, sym, ip);
211 }
212 
213 static void perf_top__show_details(struct perf_top *top)
214 {
215         struct hist_entry *he = top->sym_filter_entry;
216         struct annotation *notes;
217         struct symbol *symbol;
218         int more;
219 
220         if (!he)
221                 return;
222 
223         symbol = he->ms.sym;
224         notes = symbol__annotation(symbol);
225 
226         pthread_mutex_lock(&notes->lock);
227 
228         if (notes->src == NULL)
229                 goto out_unlock;
230 
231         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
232         printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
233 
234         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel,
235                                        0, top->sym_pcnt_filter, top->print_entries, 4);
236         if (top->zero)
237                 symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
238         else
239                 symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
240         if (more != 0)
241                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
242 out_unlock:
243         pthread_mutex_unlock(&notes->lock);
244 }
245 
246 static const char               CONSOLE_CLEAR[] = "";
247 
248 static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
249                                                      struct addr_location *al,
250                                                      struct perf_sample *sample)
251 {
252         struct hist_entry *he;
253 
254         he = __hists__add_entry(&evsel->hists, al, NULL, sample->period,
255                                 sample->weight);
256         if (he == NULL)
257                 return NULL;
258 
259         hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
260         return he;
261 }
262 
263 static void perf_top__print_sym_table(struct perf_top *top)
264 {
265         char bf[160];
266         int printed = 0;
267         const int win_width = top->winsize.ws_col - 1;
268 
269         puts(CONSOLE_CLEAR);
270 
271         perf_top__header_snprintf(top, bf, sizeof(bf));
272         printf("%s\n", bf);
273 
274         perf_top__reset_sample_counters(top);
275 
276         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
277 
278         if (top->sym_evsel->hists.stats.nr_lost_warned !=
279             top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
280                 top->sym_evsel->hists.stats.nr_lost_warned =
281                         top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
282                 color_fprintf(stdout, PERF_COLOR_RED,
283                               "WARNING: LOST %d chunks, Check IO/CPU overload",
284                               top->sym_evsel->hists.stats.nr_lost_warned);
285                 ++printed;
286         }
287 
288         if (top->sym_filter_entry) {
289                 perf_top__show_details(top);
290                 return;
291         }
292 
293         hists__collapse_resort_threaded(&top->sym_evsel->hists);
294         hists__output_resort_threaded(&top->sym_evsel->hists);
295         hists__decay_entries_threaded(&top->sym_evsel->hists,
296                                       top->hide_user_symbols,
297                                       top->hide_kernel_symbols);
298         hists__output_recalc_col_len(&top->sym_evsel->hists,
299                                      top->winsize.ws_row - 3);
300         putchar('\n');
301         hists__fprintf(&top->sym_evsel->hists, false,
302                        top->winsize.ws_row - 4 - printed, win_width, stdout);
303 }
304 
305 static void prompt_integer(int *target, const char *msg)
306 {
307         char *buf = malloc(0), *p;
308         size_t dummy = 0;
309         int tmp;
310 
311         fprintf(stdout, "\n%s: ", msg);
312         if (getline(&buf, &dummy, stdin) < 0)
313                 return;
314 
315         p = strchr(buf, '\n');
316         if (p)
317                 *p = 0;
318 
319         p = buf;
320         while(*p) {
321                 if (!isdigit(*p))
322                         goto out_free;
323                 p++;
324         }
325         tmp = strtoul(buf, NULL, 10);
326         *target = tmp;
327 out_free:
328         free(buf);
329 }
330 
331 static void prompt_percent(int *target, const char *msg)
332 {
333         int tmp = 0;
334 
335         prompt_integer(&tmp, msg);
336         if (tmp >= 0 && tmp <= 100)
337                 *target = tmp;
338 }
339 
340 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
341 {
342         char *buf = malloc(0), *p;
343         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
344         struct rb_node *next;
345         size_t dummy = 0;
346 
347         /* zero counters of active symbol */
348         if (syme) {
349                 __zero_source_counters(syme);
350                 top->sym_filter_entry = NULL;
351         }
352 
353         fprintf(stdout, "\n%s: ", msg);
354         if (getline(&buf, &dummy, stdin) < 0)
355                 goto out_free;
356 
357         p = strchr(buf, '\n');
358         if (p)
359                 *p = 0;
360 
361         next = rb_first(&top->sym_evsel->hists.entries);
362         while (next) {
363                 n = rb_entry(next, struct hist_entry, rb_node);
364                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
365                         found = n;
366                         break;
367                 }
368                 next = rb_next(&n->rb_node);
369         }
370 
371         if (!found) {
372                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
373                 sleep(1);
374         } else
375                 perf_top__parse_source(top, found);
376 
377 out_free:
378         free(buf);
379 }
380 
381 static void perf_top__print_mapped_keys(struct perf_top *top)
382 {
383         char *name = NULL;
384 
385         if (top->sym_filter_entry) {
386                 struct symbol *sym = top->sym_filter_entry->ms.sym;
387                 name = sym->name;
388         }
389 
390         fprintf(stdout, "\nMapped keys:\n");
391         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
392         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
393 
394         if (top->evlist->nr_entries > 1)
395                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
396 
397         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
398 
399         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
400         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
401         fprintf(stdout, "\t[S]     stop annotation.\n");
402 
403         fprintf(stdout,
404                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
405                 top->hide_kernel_symbols ? "yes" : "no");
406         fprintf(stdout,
407                 "\t[U]     hide user symbols.               \t(%s)\n",
408                 top->hide_user_symbols ? "yes" : "no");
409         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
410         fprintf(stdout, "\t[qQ]    quit.\n");
411 }
412 
413 static int perf_top__key_mapped(struct perf_top *top, int c)
414 {
415         switch (c) {
416                 case 'd':
417                 case 'e':
418                 case 'f':
419                 case 'z':
420                 case 'q':
421                 case 'Q':
422                 case 'K':
423                 case 'U':
424                 case 'F':
425                 case 's':
426                 case 'S':
427                         return 1;
428                 case 'E':
429                         return top->evlist->nr_entries > 1 ? 1 : 0;
430                 default:
431                         break;
432         }
433 
434         return 0;
435 }
436 
437 static bool perf_top__handle_keypress(struct perf_top *top, int c)
438 {
439         bool ret = true;
440 
441         if (!perf_top__key_mapped(top, c)) {
442                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
443                 struct termios tc, save;
444 
445                 perf_top__print_mapped_keys(top);
446                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
447                 fflush(stdout);
448 
449                 tcgetattr(0, &save);
450                 tc = save;
451                 tc.c_lflag &= ~(ICANON | ECHO);
452                 tc.c_cc[VMIN] = 0;
453                 tc.c_cc[VTIME] = 0;
454                 tcsetattr(0, TCSANOW, &tc);
455 
456                 poll(&stdin_poll, 1, -1);
457                 c = getc(stdin);
458 
459                 tcsetattr(0, TCSAFLUSH, &save);
460                 if (!perf_top__key_mapped(top, c))
461                         return ret;
462         }
463 
464         switch (c) {
465                 case 'd':
466                         prompt_integer(&top->delay_secs, "Enter display delay");
467                         if (top->delay_secs < 1)
468                                 top->delay_secs = 1;
469                         break;
470                 case 'e':
471                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
472                         if (top->print_entries == 0) {
473                                 struct sigaction act = {
474                                         .sa_sigaction = perf_top__sig_winch,
475                                         .sa_flags     = SA_SIGINFO,
476                                 };
477                                 perf_top__sig_winch(SIGWINCH, NULL, top);
478                                 sigaction(SIGWINCH, &act, NULL);
479                         } else {
480                                 perf_top__sig_winch(SIGWINCH, NULL, top);
481                                 signal(SIGWINCH, SIG_DFL);
482                         }
483                         break;
484                 case 'E':
485                         if (top->evlist->nr_entries > 1) {
486                                 /* Select 0 as the default event: */
487                                 int counter = 0;
488 
489                                 fprintf(stderr, "\nAvailable events:");
490 
491                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
492                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
493 
494                                 prompt_integer(&counter, "Enter details event counter");
495 
496                                 if (counter >= top->evlist->nr_entries) {
497                                         top->sym_evsel = perf_evlist__first(top->evlist);
498                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
499                                         sleep(1);
500                                         break;
501                                 }
502                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
503                                         if (top->sym_evsel->idx == counter)
504                                                 break;
505                         } else
506                                 top->sym_evsel = perf_evlist__first(top->evlist);
507                         break;
508                 case 'f':
509                         prompt_integer(&top->count_filter, "Enter display event count filter");
510                         break;
511                 case 'F':
512                         prompt_percent(&top->sym_pcnt_filter,
513                                        "Enter details display event filter (percent)");
514                         break;
515                 case 'K':
516                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
517                         break;
518                 case 'q':
519                 case 'Q':
520                         printf("exiting.\n");
521                         if (top->dump_symtab)
522                                 perf_session__fprintf_dsos(top->session, stderr);
523                         ret = false;
524                         break;
525                 case 's':
526                         perf_top__prompt_symbol(top, "Enter details symbol");
527                         break;
528                 case 'S':
529                         if (!top->sym_filter_entry)
530                                 break;
531                         else {
532                                 struct hist_entry *syme = top->sym_filter_entry;
533 
534                                 top->sym_filter_entry = NULL;
535                                 __zero_source_counters(syme);
536                         }
537                         break;
538                 case 'U':
539                         top->hide_user_symbols = !top->hide_user_symbols;
540                         break;
541                 case 'z':
542                         top->zero = !top->zero;
543                         break;
544                 default:
545                         break;
546         }
547 
548         return ret;
549 }
550 
551 static void perf_top__sort_new_samples(void *arg)
552 {
553         struct perf_top *t = arg;
554         perf_top__reset_sample_counters(t);
555 
556         if (t->evlist->selected != NULL)
557                 t->sym_evsel = t->evlist->selected;
558 
559         hists__collapse_resort_threaded(&t->sym_evsel->hists);
560         hists__output_resort_threaded(&t->sym_evsel->hists);
561         hists__decay_entries_threaded(&t->sym_evsel->hists,
562                                       t->hide_user_symbols,
563                                       t->hide_kernel_symbols);
564 }
565 
566 static void *display_thread_tui(void *arg)
567 {
568         struct perf_evsel *pos;
569         struct perf_top *top = arg;
570         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
571         struct hist_browser_timer hbt = {
572                 .timer          = perf_top__sort_new_samples,
573                 .arg            = top,
574                 .refresh        = top->delay_secs,
575         };
576 
577         perf_top__sort_new_samples(top);
578 
579         /*
580          * Initialize the uid_filter_str, in the future the TUI will allow
581          * Zooming in/out UIDs. For now juse use whatever the user passed
582          * via --uid.
583          */
584         list_for_each_entry(pos, &top->evlist->entries, node)
585                 pos->hists.uid_filter_str = top->record_opts.target.uid_str;
586 
587         perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
588                                       &top->session->header.env);
589 
590         done = 1;
591         return NULL;
592 }
593 
594 static void *display_thread(void *arg)
595 {
596         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
597         struct termios tc, save;
598         struct perf_top *top = arg;
599         int delay_msecs, c;
600 
601         tcgetattr(0, &save);
602         tc = save;
603         tc.c_lflag &= ~(ICANON | ECHO);
604         tc.c_cc[VMIN] = 0;
605         tc.c_cc[VTIME] = 0;
606 
607         pthread__unblock_sigwinch();
608 repeat:
609         delay_msecs = top->delay_secs * 1000;
610         tcsetattr(0, TCSANOW, &tc);
611         /* trash return*/
612         getc(stdin);
613 
614         while (!done) {
615                 perf_top__print_sym_table(top);
616                 /*
617                  * Either timeout expired or we got an EINTR due to SIGWINCH,
618                  * refresh screen in both cases.
619                  */
620                 switch (poll(&stdin_poll, 1, delay_msecs)) {
621                 case 0:
622                         continue;
623                 case -1:
624                         if (errno == EINTR)
625                                 continue;
626                         /* Fall trhu */
627                 default:
628                         c = getc(stdin);
629                         tcsetattr(0, TCSAFLUSH, &save);
630 
631                         if (perf_top__handle_keypress(top, c))
632                                 goto repeat;
633                         done = 1;
634                 }
635         }
636 
637         return NULL;
638 }
639 
640 /* Tag samples to be skipped. */
641 static const char *skip_symbols[] = {
642         "intel_idle",
643         "default_idle",
644         "native_safe_halt",
645         "cpu_idle",
646         "enter_idle",
647         "exit_idle",
648         "mwait_idle",
649         "mwait_idle_with_hints",
650         "poll_idle",
651         "ppc64_runlatch_off",
652         "pseries_dedicated_idle_sleep",
653         NULL
654 };
655 
656 static int symbol_filter(struct map *map __maybe_unused, struct symbol *sym)
657 {
658         const char *name = sym->name;
659         int i;
660 
661         /*
662          * ppc64 uses function descriptors and appends a '.' to the
663          * start of every instruction address. Remove it.
664          */
665         if (name[0] == '.')
666                 name++;
667 
668         if (!strcmp(name, "_text") ||
669             !strcmp(name, "_etext") ||
670             !strcmp(name, "_sinittext") ||
671             !strncmp("init_module", name, 11) ||
672             !strncmp("cleanup_module", name, 14) ||
673             strstr(name, "_text_start") ||
674             strstr(name, "_text_end"))
675                 return 1;
676 
677         for (i = 0; skip_symbols[i]; i++) {
678                 if (!strcmp(skip_symbols[i], name)) {
679                         sym->ignore = true;
680                         break;
681                 }
682         }
683 
684         return 0;
685 }
686 
687 static void perf_event__process_sample(struct perf_tool *tool,
688                                        const union perf_event *event,
689                                        struct perf_evsel *evsel,
690                                        struct perf_sample *sample,
691                                        struct machine *machine)
692 {
693         struct perf_top *top = container_of(tool, struct perf_top, tool);
694         struct symbol *parent = NULL;
695         u64 ip = event->ip.ip;
696         struct addr_location al;
697         int err;
698 
699         if (!machine && perf_guest) {
700                 static struct intlist *seen;
701 
702                 if (!seen)
703                         seen = intlist__new(NULL);
704 
705                 if (!intlist__has_entry(seen, event->ip.pid)) {
706                         pr_err("Can't find guest [%d]'s kernel information\n",
707                                 event->ip.pid);
708                         intlist__add(seen, event->ip.pid);
709                 }
710                 return;
711         }
712 
713         if (!machine) {
714                 pr_err("%u unprocessable samples recorded.\r",
715                        top->session->stats.nr_unprocessable_samples++);
716                 return;
717         }
718 
719         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
720                 top->exact_samples++;
721 
722         if (perf_event__preprocess_sample(event, machine, &al, sample,
723                                           symbol_filter) < 0 ||
724             al.filtered)
725                 return;
726 
727         if (!top->kptr_restrict_warned &&
728             symbol_conf.kptr_restrict &&
729             al.cpumode == PERF_RECORD_MISC_KERNEL) {
730                 ui__warning(
731 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
732 "Check /proc/sys/kernel/kptr_restrict.\n\n"
733 "Kernel%s samples will not be resolved.\n",
734                           !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
735                           " modules" : "");
736                 if (use_browser <= 0)
737                         sleep(5);
738                 top->kptr_restrict_warned = true;
739         }
740 
741         if (al.sym == NULL) {
742                 const char *msg = "Kernel samples will not be resolved.\n";
743                 /*
744                  * As we do lazy loading of symtabs we only will know if the
745                  * specified vmlinux file is invalid when we actually have a
746                  * hit in kernel space and then try to load it. So if we get
747                  * here and there are _no_ symbols in the DSO backing the
748                  * kernel map, bail out.
749                  *
750                  * We may never get here, for instance, if we use -K/
751                  * --hide-kernel-symbols, even if the user specifies an
752                  * invalid --vmlinux ;-)
753                  */
754                 if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
755                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
756                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
757                         if (symbol_conf.vmlinux_name) {
758                                 ui__warning("The %s file can't be used.\n%s",
759                                             symbol_conf.vmlinux_name, msg);
760                         } else {
761                                 ui__warning("A vmlinux file was not found.\n%s",
762                                             msg);
763                         }
764 
765                         if (use_browser <= 0)
766                                 sleep(5);
767                         top->vmlinux_warned = true;
768                 }
769         }
770 
771         if (al.sym == NULL || !al.sym->ignore) {
772                 struct hist_entry *he;
773 
774                 if ((sort__has_parent || symbol_conf.use_callchain) &&
775                     sample->callchain) {
776                         err = machine__resolve_callchain(machine, evsel,
777                                                          al.thread, sample,
778                                                          &parent);
779 
780                         if (err)
781                                 return;
782                 }
783 
784                 he = perf_evsel__add_hist_entry(evsel, &al, sample);
785                 if (he == NULL) {
786                         pr_err("Problem incrementing symbol period, skipping event\n");
787                         return;
788                 }
789 
790                 if (symbol_conf.use_callchain) {
791                         err = callchain_append(he->callchain, &callchain_cursor,
792                                                sample->period);
793                         if (err)
794                                 return;
795                 }
796 
797                 if (top->sort_has_symbols)
798                         perf_top__record_precise_ip(top, he, evsel->idx, ip);
799         }
800 
801         return;
802 }
803 
804 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
805 {
806         struct perf_sample sample;
807         struct perf_evsel *evsel;
808         struct perf_session *session = top->session;
809         union perf_event *event;
810         struct machine *machine;
811         u8 origin;
812         int ret;
813 
814         while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
815                 ret = perf_evlist__parse_sample(top->evlist, event, &sample);
816                 if (ret) {
817                         pr_err("Can't parse sample, err = %d\n", ret);
818                         continue;
819                 }
820 
821                 evsel = perf_evlist__id2evsel(session->evlist, sample.id);
822                 assert(evsel != NULL);
823 
824                 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
825 
826                 if (event->header.type == PERF_RECORD_SAMPLE)
827                         ++top->samples;
828 
829                 switch (origin) {
830                 case PERF_RECORD_MISC_USER:
831                         ++top->us_samples;
832                         if (top->hide_user_symbols)
833                                 continue;
834                         machine = &session->machines.host;
835                         break;
836                 case PERF_RECORD_MISC_KERNEL:
837                         ++top->kernel_samples;
838                         if (top->hide_kernel_symbols)
839                                 continue;
840                         machine = &session->machines.host;
841                         break;
842                 case PERF_RECORD_MISC_GUEST_KERNEL:
843                         ++top->guest_kernel_samples;
844                         machine = perf_session__find_machine(session, event->ip.pid);
845                         break;
846                 case PERF_RECORD_MISC_GUEST_USER:
847                         ++top->guest_us_samples;
848                         /*
849                          * TODO: we don't process guest user from host side
850                          * except simple counting.
851                          */
852                         /* Fall thru */
853                 default:
854                         continue;
855                 }
856 
857 
858                 if (event->header.type == PERF_RECORD_SAMPLE) {
859                         perf_event__process_sample(&top->tool, event, evsel,
860                                                    &sample, machine);
861                 } else if (event->header.type < PERF_RECORD_MAX) {
862                         hists__inc_nr_events(&evsel->hists, event->header.type);
863                         machine__process_event(machine, event);
864                 } else
865                         ++session->stats.nr_unknown_events;
866         }
867 }
868 
869 static void perf_top__mmap_read(struct perf_top *top)
870 {
871         int i;
872 
873         for (i = 0; i < top->evlist->nr_mmaps; i++)
874                 perf_top__mmap_read_idx(top, i);
875 }
876 
877 static int perf_top__start_counters(struct perf_top *top)
878 {
879         char msg[512];
880         struct perf_evsel *counter;
881         struct perf_evlist *evlist = top->evlist;
882         struct perf_record_opts *opts = &top->record_opts;
883 
884         perf_evlist__config(evlist, opts);
885 
886         list_for_each_entry(counter, &evlist->entries, node) {
887 try_again:
888                 if (perf_evsel__open(counter, top->evlist->cpus,
889                                      top->evlist->threads) < 0) {
890                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
891                                 if (verbose)
892                                         ui__warning("%s\n", msg);
893                                 goto try_again;
894                         }
895 
896                         perf_evsel__open_strerror(counter, &opts->target,
897                                                   errno, msg, sizeof(msg));
898                         ui__error("%s\n", msg);
899                         goto out_err;
900                 }
901         }
902 
903         if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
904                 ui__error("Failed to mmap with %d (%s)\n",
905                             errno, strerror(errno));
906                 goto out_err;
907         }
908 
909         return 0;
910 
911 out_err:
912         return -1;
913 }
914 
915 static int perf_top__setup_sample_type(struct perf_top *top)
916 {
917         if (!top->sort_has_symbols) {
918                 if (symbol_conf.use_callchain) {
919                         ui__error("Selected -g but \"sym\" not present in --sort/-s.");
920                         return -EINVAL;
921                 }
922         } else if (callchain_param.mode != CHAIN_NONE) {
923                 if (callchain_register_param(&callchain_param) < 0) {
924                         ui__error("Can't register callchain params.\n");
925                         return -EINVAL;
926                 }
927         }
928 
929         return 0;
930 }
931 
932 static int __cmd_top(struct perf_top *top)
933 {
934         struct perf_record_opts *opts = &top->record_opts;
935         pthread_t thread;
936         int ret;
937         /*
938          * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
939          * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
940          */
941         top->session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
942         if (top->session == NULL)
943                 return -ENOMEM;
944 
945         ret = perf_top__setup_sample_type(top);
946         if (ret)
947                 goto out_delete;
948 
949         if (perf_target__has_task(&opts->target))
950                 perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
951                                                   perf_event__process,
952                                                   &top->session->machines.host);
953         else
954                 perf_event__synthesize_threads(&top->tool, perf_event__process,
955                                                &top->session->machines.host);
956 
957         ret = perf_top__start_counters(top);
958         if (ret)
959                 goto out_delete;
960 
961         top->session->evlist = top->evlist;
962         perf_session__set_id_hdr_size(top->session);
963 
964         /*
965          * When perf is starting the traced process, all the events (apart from
966          * group members) have enable_on_exec=1 set, so don't spoil it by
967          * prematurely enabling them.
968          *
969          * XXX 'top' still doesn't start workloads like record, trace, but should,
970          * so leave the check here.
971          */
972         if (!perf_target__none(&opts->target))
973                 perf_evlist__enable(top->evlist);
974 
975         /* Wait for a minimal set of events before starting the snapshot */
976         poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
977 
978         perf_top__mmap_read(top);
979 
980         ret = -1;
981         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
982                                                             display_thread), top)) {
983                 ui__error("Could not create display thread.\n");
984                 goto out_delete;
985         }
986 
987         if (top->realtime_prio) {
988                 struct sched_param param;
989 
990                 param.sched_priority = top->realtime_prio;
991                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
992                         ui__error("Could not set realtime priority.\n");
993                         goto out_delete;
994                 }
995         }
996 
997         while (!done) {
998                 u64 hits = top->samples;
999 
1000                 perf_top__mmap_read(top);
1001 
1002                 if (hits == top->samples)
1003                         ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1004         }
1005 
1006         ret = 0;
1007 out_delete:
1008         perf_session__delete(top->session);
1009         top->session = NULL;
1010 
1011         return ret;
1012 }
1013 
1014 static int
1015 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1016 {
1017         /*
1018          * --no-call-graph
1019          */
1020         if (unset)
1021                 return 0;
1022 
1023         symbol_conf.use_callchain = true;
1024 
1025         return record_parse_callchain_opt(opt, arg, unset);
1026 }
1027 
1028 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
1029 {
1030         int status;
1031         char errbuf[BUFSIZ];
1032         struct perf_top top = {
1033                 .count_filter        = 5,
1034                 .delay_secs          = 2,
1035                 .record_opts = {
1036                         .mmap_pages     = UINT_MAX,
1037                         .user_freq      = UINT_MAX,
1038                         .user_interval  = ULLONG_MAX,
1039                         .freq           = 4000, /* 4 KHz */
1040                         .target              = {
1041                                 .uses_mmap   = true,
1042                         },
1043                 },
1044                 .sym_pcnt_filter     = 5,
1045         };
1046         struct perf_record_opts *opts = &top.record_opts;
1047         struct perf_target *target = &opts->target;
1048         const struct option options[] = {
1049         OPT_CALLBACK('e', "event", &top.evlist, "event",
1050                      "event selector. use 'perf list' to list available events",
1051                      parse_events_option),
1052         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1053         OPT_STRING('p', "pid", &target->pid, "pid",
1054                     "profile events on existing process id"),
1055         OPT_STRING('t', "tid", &target->tid, "tid",
1056                     "profile events on existing thread id"),
1057         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1058                             "system-wide collection from all CPUs"),
1059         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1060                     "list of cpus to monitor"),
1061         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1062                    "file", "vmlinux pathname"),
1063         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1064                     "hide kernel symbols"),
1065         OPT_UINTEGER('m', "mmap-pages", &opts->mmap_pages,
1066                      "number of mmap data pages"),
1067         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1068                     "collect data with this RT SCHED_FIFO priority"),
1069         OPT_INTEGER('d', "delay", &top.delay_secs,
1070                     "number of seconds to delay between refreshes"),
1071         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1072                             "dump the symbol table used for profiling"),
1073         OPT_INTEGER('f', "count-filter", &top.count_filter,
1074                     "only display functions with more events than this"),
1075         OPT_BOOLEAN('g', "group", &opts->group,
1076                             "put the counters into a counter group"),
1077         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1078                     "child tasks do not inherit counters"),
1079         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1080                     "symbol to annotate"),
1081         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1082         OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
1083         OPT_INTEGER('E', "entries", &top.print_entries,
1084                     "display this many functions"),
1085         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1086                     "hide user symbols"),
1087         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1088         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1089         OPT_INCR('v', "verbose", &verbose,
1090                     "be more verbose (show counter open errors, etc)"),
1091         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1092                    "sort by key(s): pid, comm, dso, symbol, parent, weight, local_weight"),
1093         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1094                     "Show a column with the number of samples"),
1095         OPT_CALLBACK_DEFAULT('G', "call-graph", &top.record_opts,
1096                              "mode[,dump_size]", record_callchain_help,
1097                              &parse_callchain_opt, "fp"),
1098         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1099                     "Show a column with the sum of periods"),
1100         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1101                    "only consider symbols in these dsos"),
1102         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1103                    "only consider symbols in these comms"),
1104         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1105                    "only consider these symbols"),
1106         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1107                     "Interleave source code with assembly code (default)"),
1108         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1109                     "Display raw encoding of assembly instructions (default)"),
1110         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1111                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1112         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1113         OPT_END()
1114         };
1115         const char * const top_usage[] = {
1116                 "perf top [<options>]",
1117                 NULL
1118         };
1119 
1120         top.evlist = perf_evlist__new();
1121         if (top.evlist == NULL)
1122                 return -ENOMEM;
1123 
1124         symbol_conf.exclude_other = false;
1125 
1126         argc = parse_options(argc, argv, options, top_usage, 0);
1127         if (argc)
1128                 usage_with_options(top_usage, options);
1129 
1130         if (sort_order == default_sort_order)
1131                 sort_order = "dso,symbol";
1132 
1133         if (setup_sorting() < 0)
1134                 usage_with_options(top_usage, options);
1135 
1136         if (top.use_stdio)
1137                 use_browser = 0;
1138         else if (top.use_tui)
1139                 use_browser = 1;
1140 
1141         setup_browser(false);
1142 
1143         status = perf_target__validate(target);
1144         if (status) {
1145                 perf_target__strerror(target, status, errbuf, BUFSIZ);
1146                 ui__warning("%s", errbuf);
1147         }
1148 
1149         status = perf_target__parse_uid(target);
1150         if (status) {
1151                 int saved_errno = errno;
1152 
1153                 perf_target__strerror(target, status, errbuf, BUFSIZ);
1154                 ui__error("%s", errbuf);
1155 
1156                 status = -saved_errno;
1157                 goto out_delete_evlist;
1158         }
1159 
1160         if (perf_target__none(target))
1161                 target->system_wide = true;
1162 
1163         if (perf_evlist__create_maps(top.evlist, target) < 0)
1164                 usage_with_options(top_usage, options);
1165 
1166         if (!top.evlist->nr_entries &&
1167             perf_evlist__add_default(top.evlist) < 0) {
1168                 ui__error("Not enough memory for event selector list\n");
1169                 goto out_delete_maps;
1170         }
1171 
1172         symbol_conf.nr_events = top.evlist->nr_entries;
1173 
1174         if (top.delay_secs < 1)
1175                 top.delay_secs = 1;
1176 
1177         if (opts->user_interval != ULLONG_MAX)
1178                 opts->default_interval = opts->user_interval;
1179         if (opts->user_freq != UINT_MAX)
1180                 opts->freq = opts->user_freq;
1181 
1182         /*
1183          * User specified count overrides default frequency.
1184          */
1185         if (opts->default_interval)
1186                 opts->freq = 0;
1187         else if (opts->freq) {
1188                 opts->default_interval = opts->freq;
1189         } else {
1190                 ui__error("frequency and count are zero, aborting\n");
1191                 status = -EINVAL;
1192                 goto out_delete_maps;
1193         }
1194 
1195         top.sym_evsel = perf_evlist__first(top.evlist);
1196 
1197         symbol_conf.priv_size = sizeof(struct annotation);
1198 
1199         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1200         if (symbol__init() < 0)
1201                 return -1;
1202 
1203         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
1204         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
1205         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
1206 
1207         /*
1208          * Avoid annotation data structures overhead when symbols aren't on the
1209          * sort list.
1210          */
1211         top.sort_has_symbols = sort_sym.list.next != NULL;
1212 
1213         get_term_dimensions(&top.winsize);
1214         if (top.print_entries == 0) {
1215                 struct sigaction act = {
1216                         .sa_sigaction = perf_top__sig_winch,
1217                         .sa_flags     = SA_SIGINFO,
1218                 };
1219                 perf_top__update_print_entries(&top);
1220                 sigaction(SIGWINCH, &act, NULL);
1221         }
1222 
1223         status = __cmd_top(&top);
1224 
1225 out_delete_maps:
1226         perf_evlist__delete_maps(top.evlist);
1227 out_delete_evlist:
1228         perf_evlist__delete(top.evlist);
1229 
1230         return status;
1231 }
1232 

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