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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 #include "arch/common.h"
 44 
 45 #include "util/debug.h"
 46 
 47 #include <assert.h>
 48 #include <elf.h>
 49 #include <fcntl.h>
 50 
 51 #include <stdio.h>
 52 #include <termios.h>
 53 #include <unistd.h>
 54 #include <inttypes.h>
 55 
 56 #include <errno.h>
 57 #include <time.h>
 58 #include <sched.h>
 59 
 60 #include <sys/syscall.h>
 61 #include <sys/ioctl.h>
 62 #include <poll.h>
 63 #include <sys/prctl.h>
 64 #include <sys/wait.h>
 65 #include <sys/uio.h>
 66 #include <sys/utsname.h>
 67 #include <sys/mman.h>
 68 
 69 #include <linux/types.h>
 70 
 71 static volatile int done;
 72 
 73 #define HEADER_LINE_NR  5
 74 
 75 static void perf_top__update_print_entries(struct perf_top *top)
 76 {
 77         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
 78 }
 79 
 80 static void perf_top__sig_winch(int sig __maybe_unused,
 81                                 siginfo_t *info __maybe_unused, void *arg)
 82 {
 83         struct perf_top *top = arg;
 84 
 85         get_term_dimensions(&top->winsize);
 86         perf_top__update_print_entries(top);
 87 }
 88 
 89 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 90 {
 91         struct symbol *sym;
 92         struct annotation *notes;
 93         struct map *map;
 94         int err = -1;
 95 
 96         if (!he || !he->ms.sym)
 97                 return -1;
 98 
 99         sym = he->ms.sym;
100         map = he->ms.map;
101 
102         /*
103          * We can't annotate with just /proc/kallsyms
104          */
105         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
106             !dso__is_kcore(map->dso)) {
107                 pr_err("Can't annotate %s: No vmlinux file was found in the "
108                        "path\n", sym->name);
109                 sleep(1);
110                 return -1;
111         }
112 
113         notes = symbol__annotation(sym);
114         if (notes->src != NULL) {
115                 pthread_mutex_lock(&notes->lock);
116                 goto out_assign;
117         }
118 
119         pthread_mutex_lock(&notes->lock);
120 
121         if (symbol__alloc_hist(sym) < 0) {
122                 pthread_mutex_unlock(&notes->lock);
123                 pr_err("Not enough memory for annotating '%s' symbol!\n",
124                        sym->name);
125                 sleep(1);
126                 return err;
127         }
128 
129         err = symbol__annotate(sym, map, 0);
130         if (err == 0) {
131 out_assign:
132                 top->sym_filter_entry = he;
133         }
134 
135         pthread_mutex_unlock(&notes->lock);
136         return err;
137 }
138 
139 static void __zero_source_counters(struct hist_entry *he)
140 {
141         struct symbol *sym = he->ms.sym;
142         symbol__annotate_zero_histograms(sym);
143 }
144 
145 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
146 {
147         struct utsname uts;
148         int err = uname(&uts);
149 
150         ui__warning("Out of bounds address found:\n\n"
151                     "Addr:   %" PRIx64 "\n"
152                     "DSO:    %s %c\n"
153                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
154                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
155                     "Arch:   %s\n"
156                     "Kernel: %s\n"
157                     "Tools:  %s\n\n"
158                     "Not all samples will be on the annotation output.\n\n"
159                     "Please report to linux-kernel@vger.kernel.org\n",
160                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
161                     map->start, map->end, sym->start, sym->end,
162                     sym->binding == STB_GLOBAL ? 'g' :
163                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
164                     err ? "[unknown]" : uts.machine,
165                     err ? "[unknown]" : uts.release, perf_version_string);
166         if (use_browser <= 0)
167                 sleep(5);
168         
169         map->erange_warned = true;
170 }
171 
172 static void perf_top__record_precise_ip(struct perf_top *top,
173                                         struct hist_entry *he,
174                                         int counter, u64 ip)
175 {
176         struct annotation *notes;
177         struct symbol *sym;
178         int err = 0;
179 
180         if (he == NULL || he->ms.sym == NULL ||
181             ((top->sym_filter_entry == NULL ||
182               top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
183                 return;
184 
185         sym = he->ms.sym;
186         notes = symbol__annotation(sym);
187 
188         if (pthread_mutex_trylock(&notes->lock))
189                 return;
190 
191         ip = he->ms.map->map_ip(he->ms.map, ip);
192 
193         if (ui__has_annotation())
194                 err = hist_entry__inc_addr_samples(he, counter, ip);
195 
196         pthread_mutex_unlock(&notes->lock);
197 
198         /*
199          * This function is now called with he->hists->lock held.
200          * Release it before going to sleep.
201          */
202         pthread_mutex_unlock(&he->hists->lock);
203 
204         if (err == -ERANGE && !he->ms.map->erange_warned)
205                 ui__warn_map_erange(he->ms.map, sym, ip);
206         else if (err == -ENOMEM) {
207                 pr_err("Not enough memory for annotating '%s' symbol!\n",
208                        sym->name);
209                 sleep(1);
210         }
211 
212         pthread_mutex_lock(&he->hists->lock);
213 }
214 
215 static void perf_top__show_details(struct perf_top *top)
216 {
217         struct hist_entry *he = top->sym_filter_entry;
218         struct annotation *notes;
219         struct symbol *symbol;
220         int more;
221 
222         if (!he)
223                 return;
224 
225         symbol = he->ms.sym;
226         notes = symbol__annotation(symbol);
227 
228         pthread_mutex_lock(&notes->lock);
229 
230         if (notes->src == NULL)
231                 goto out_unlock;
232 
233         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
234         printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
235 
236         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel,
237                                        0, top->sym_pcnt_filter, top->print_entries, 4);
238         if (top->zero)
239                 symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
240         else
241                 symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
242         if (more != 0)
243                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
244 out_unlock:
245         pthread_mutex_unlock(&notes->lock);
246 }
247 
248 static void perf_top__print_sym_table(struct perf_top *top)
249 {
250         char bf[160];
251         int printed = 0;
252         const int win_width = top->winsize.ws_col - 1;
253         struct hists *hists = evsel__hists(top->sym_evsel);
254 
255         puts(CONSOLE_CLEAR);
256 
257         perf_top__header_snprintf(top, bf, sizeof(bf));
258         printf("%s\n", bf);
259 
260         perf_top__reset_sample_counters(top);
261 
262         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
263 
264         if (hists->stats.nr_lost_warned !=
265             hists->stats.nr_events[PERF_RECORD_LOST]) {
266                 hists->stats.nr_lost_warned =
267                               hists->stats.nr_events[PERF_RECORD_LOST];
268                 color_fprintf(stdout, PERF_COLOR_RED,
269                               "WARNING: LOST %d chunks, Check IO/CPU overload",
270                               hists->stats.nr_lost_warned);
271                 ++printed;
272         }
273 
274         if (top->sym_filter_entry) {
275                 perf_top__show_details(top);
276                 return;
277         }
278 
279         if (top->zero) {
280                 hists__delete_entries(hists);
281         } else {
282                 hists__decay_entries(hists, top->hide_user_symbols,
283                                      top->hide_kernel_symbols);
284         }
285 
286         hists__collapse_resort(hists, NULL);
287         hists__output_resort(hists, NULL);
288 
289         hists__output_recalc_col_len(hists, top->print_entries - printed);
290         putchar('\n');
291         hists__fprintf(hists, false, top->print_entries - printed, win_width,
292                        top->min_percent, stdout);
293 }
294 
295 static void prompt_integer(int *target, const char *msg)
296 {
297         char *buf = malloc(0), *p;
298         size_t dummy = 0;
299         int tmp;
300 
301         fprintf(stdout, "\n%s: ", msg);
302         if (getline(&buf, &dummy, stdin) < 0)
303                 return;
304 
305         p = strchr(buf, '\n');
306         if (p)
307                 *p = 0;
308 
309         p = buf;
310         while(*p) {
311                 if (!isdigit(*p))
312                         goto out_free;
313                 p++;
314         }
315         tmp = strtoul(buf, NULL, 10);
316         *target = tmp;
317 out_free:
318         free(buf);
319 }
320 
321 static void prompt_percent(int *target, const char *msg)
322 {
323         int tmp = 0;
324 
325         prompt_integer(&tmp, msg);
326         if (tmp >= 0 && tmp <= 100)
327                 *target = tmp;
328 }
329 
330 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
331 {
332         char *buf = malloc(0), *p;
333         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
334         struct hists *hists = evsel__hists(top->sym_evsel);
335         struct rb_node *next;
336         size_t dummy = 0;
337 
338         /* zero counters of active symbol */
339         if (syme) {
340                 __zero_source_counters(syme);
341                 top->sym_filter_entry = NULL;
342         }
343 
344         fprintf(stdout, "\n%s: ", msg);
345         if (getline(&buf, &dummy, stdin) < 0)
346                 goto out_free;
347 
348         p = strchr(buf, '\n');
349         if (p)
350                 *p = 0;
351 
352         next = rb_first(&hists->entries);
353         while (next) {
354                 n = rb_entry(next, struct hist_entry, rb_node);
355                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
356                         found = n;
357                         break;
358                 }
359                 next = rb_next(&n->rb_node);
360         }
361 
362         if (!found) {
363                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
364                 sleep(1);
365         } else
366                 perf_top__parse_source(top, found);
367 
368 out_free:
369         free(buf);
370 }
371 
372 static void perf_top__print_mapped_keys(struct perf_top *top)
373 {
374         char *name = NULL;
375 
376         if (top->sym_filter_entry) {
377                 struct symbol *sym = top->sym_filter_entry->ms.sym;
378                 name = sym->name;
379         }
380 
381         fprintf(stdout, "\nMapped keys:\n");
382         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
383         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
384 
385         if (top->evlist->nr_entries > 1)
386                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
387 
388         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
389 
390         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
391         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
392         fprintf(stdout, "\t[S]     stop annotation.\n");
393 
394         fprintf(stdout,
395                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
396                 top->hide_kernel_symbols ? "yes" : "no");
397         fprintf(stdout,
398                 "\t[U]     hide user symbols.               \t(%s)\n",
399                 top->hide_user_symbols ? "yes" : "no");
400         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
401         fprintf(stdout, "\t[qQ]    quit.\n");
402 }
403 
404 static int perf_top__key_mapped(struct perf_top *top, int c)
405 {
406         switch (c) {
407                 case 'd':
408                 case 'e':
409                 case 'f':
410                 case 'z':
411                 case 'q':
412                 case 'Q':
413                 case 'K':
414                 case 'U':
415                 case 'F':
416                 case 's':
417                 case 'S':
418                         return 1;
419                 case 'E':
420                         return top->evlist->nr_entries > 1 ? 1 : 0;
421                 default:
422                         break;
423         }
424 
425         return 0;
426 }
427 
428 static bool perf_top__handle_keypress(struct perf_top *top, int c)
429 {
430         bool ret = true;
431 
432         if (!perf_top__key_mapped(top, c)) {
433                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
434                 struct termios save;
435 
436                 perf_top__print_mapped_keys(top);
437                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
438                 fflush(stdout);
439 
440                 set_term_quiet_input(&save);
441 
442                 poll(&stdin_poll, 1, -1);
443                 c = getc(stdin);
444 
445                 tcsetattr(0, TCSAFLUSH, &save);
446                 if (!perf_top__key_mapped(top, c))
447                         return ret;
448         }
449 
450         switch (c) {
451                 case 'd':
452                         prompt_integer(&top->delay_secs, "Enter display delay");
453                         if (top->delay_secs < 1)
454                                 top->delay_secs = 1;
455                         break;
456                 case 'e':
457                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
458                         if (top->print_entries == 0) {
459                                 struct sigaction act = {
460                                         .sa_sigaction = perf_top__sig_winch,
461                                         .sa_flags     = SA_SIGINFO,
462                                 };
463                                 perf_top__sig_winch(SIGWINCH, NULL, top);
464                                 sigaction(SIGWINCH, &act, NULL);
465                         } else {
466                                 signal(SIGWINCH, SIG_DFL);
467                         }
468                         break;
469                 case 'E':
470                         if (top->evlist->nr_entries > 1) {
471                                 /* Select 0 as the default event: */
472                                 int counter = 0;
473 
474                                 fprintf(stderr, "\nAvailable events:");
475 
476                                 evlist__for_each(top->evlist, top->sym_evsel)
477                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
478 
479                                 prompt_integer(&counter, "Enter details event counter");
480 
481                                 if (counter >= top->evlist->nr_entries) {
482                                         top->sym_evsel = perf_evlist__first(top->evlist);
483                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
484                                         sleep(1);
485                                         break;
486                                 }
487                                 evlist__for_each(top->evlist, top->sym_evsel)
488                                         if (top->sym_evsel->idx == counter)
489                                                 break;
490                         } else
491                                 top->sym_evsel = perf_evlist__first(top->evlist);
492                         break;
493                 case 'f':
494                         prompt_integer(&top->count_filter, "Enter display event count filter");
495                         break;
496                 case 'F':
497                         prompt_percent(&top->sym_pcnt_filter,
498                                        "Enter details display event filter (percent)");
499                         break;
500                 case 'K':
501                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
502                         break;
503                 case 'q':
504                 case 'Q':
505                         printf("exiting.\n");
506                         if (top->dump_symtab)
507                                 perf_session__fprintf_dsos(top->session, stderr);
508                         ret = false;
509                         break;
510                 case 's':
511                         perf_top__prompt_symbol(top, "Enter details symbol");
512                         break;
513                 case 'S':
514                         if (!top->sym_filter_entry)
515                                 break;
516                         else {
517                                 struct hist_entry *syme = top->sym_filter_entry;
518 
519                                 top->sym_filter_entry = NULL;
520                                 __zero_source_counters(syme);
521                         }
522                         break;
523                 case 'U':
524                         top->hide_user_symbols = !top->hide_user_symbols;
525                         break;
526                 case 'z':
527                         top->zero = !top->zero;
528                         break;
529                 default:
530                         break;
531         }
532 
533         return ret;
534 }
535 
536 static void perf_top__sort_new_samples(void *arg)
537 {
538         struct perf_top *t = arg;
539         struct hists *hists;
540 
541         perf_top__reset_sample_counters(t);
542 
543         if (t->evlist->selected != NULL)
544                 t->sym_evsel = t->evlist->selected;
545 
546         hists = evsel__hists(t->sym_evsel);
547 
548         if (t->zero) {
549                 hists__delete_entries(hists);
550         } else {
551                 hists__decay_entries(hists, t->hide_user_symbols,
552                                      t->hide_kernel_symbols);
553         }
554 
555         hists__collapse_resort(hists, NULL);
556         hists__output_resort(hists, NULL);
557 }
558 
559 static void *display_thread_tui(void *arg)
560 {
561         struct perf_evsel *pos;
562         struct perf_top *top = arg;
563         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
564         struct hist_browser_timer hbt = {
565                 .timer          = perf_top__sort_new_samples,
566                 .arg            = top,
567                 .refresh        = top->delay_secs,
568         };
569 
570         perf_top__sort_new_samples(top);
571 
572         /*
573          * Initialize the uid_filter_str, in the future the TUI will allow
574          * Zooming in/out UIDs. For now juse use whatever the user passed
575          * via --uid.
576          */
577         evlist__for_each(top->evlist, pos) {
578                 struct hists *hists = evsel__hists(pos);
579                 hists->uid_filter_str = top->record_opts.target.uid_str;
580         }
581 
582         perf_evlist__tui_browse_hists(top->evlist, help, &hbt, top->min_percent,
583                                       &top->session->header.env);
584 
585         done = 1;
586         return NULL;
587 }
588 
589 static void display_sig(int sig __maybe_unused)
590 {
591         done = 1;
592 }
593 
594 static void display_setup_sig(void)
595 {
596         signal(SIGSEGV, display_sig);
597         signal(SIGFPE,  display_sig);
598         signal(SIGINT,  display_sig);
599         signal(SIGQUIT, display_sig);
600         signal(SIGTERM, display_sig);
601 }
602 
603 static void *display_thread(void *arg)
604 {
605         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
606         struct termios save;
607         struct perf_top *top = arg;
608         int delay_msecs, c;
609 
610         display_setup_sig();
611         pthread__unblock_sigwinch();
612 repeat:
613         delay_msecs = top->delay_secs * 1000;
614         set_term_quiet_input(&save);
615         /* trash return*/
616         getc(stdin);
617 
618         while (!done) {
619                 perf_top__print_sym_table(top);
620                 /*
621                  * Either timeout expired or we got an EINTR due to SIGWINCH,
622                  * refresh screen in both cases.
623                  */
624                 switch (poll(&stdin_poll, 1, delay_msecs)) {
625                 case 0:
626                         continue;
627                 case -1:
628                         if (errno == EINTR)
629                                 continue;
630                         /* Fall trhu */
631                 default:
632                         c = getc(stdin);
633                         tcsetattr(0, TCSAFLUSH, &save);
634 
635                         if (perf_top__handle_keypress(top, c))
636                                 goto repeat;
637                         done = 1;
638                 }
639         }
640 
641         tcsetattr(0, TCSAFLUSH, &save);
642         return NULL;
643 }
644 
645 static int symbol_filter(struct map *map, struct symbol *sym)
646 {
647         const char *name = sym->name;
648 
649         if (!map->dso->kernel)
650                 return 0;
651         /*
652          * ppc64 uses function descriptors and appends a '.' to the
653          * start of every instruction address. Remove it.
654          */
655         if (name[0] == '.')
656                 name++;
657 
658         if (!strcmp(name, "_text") ||
659             !strcmp(name, "_etext") ||
660             !strcmp(name, "_sinittext") ||
661             !strncmp("init_module", name, 11) ||
662             !strncmp("cleanup_module", name, 14) ||
663             strstr(name, "_text_start") ||
664             strstr(name, "_text_end"))
665                 return 1;
666 
667         if (symbol__is_idle(sym))
668                 sym->ignore = true;
669 
670         return 0;
671 }
672 
673 static int hist_iter__top_callback(struct hist_entry_iter *iter,
674                                    struct addr_location *al, bool single,
675                                    void *arg)
676 {
677         struct perf_top *top = arg;
678         struct hist_entry *he = iter->he;
679         struct perf_evsel *evsel = iter->evsel;
680 
681         if (sort__has_sym && single) {
682                 u64 ip = al->addr;
683 
684                 if (al->map)
685                         ip = al->map->unmap_ip(al->map, ip);
686 
687                 perf_top__record_precise_ip(top, he, evsel->idx, ip);
688         }
689 
690         return 0;
691 }
692 
693 static void perf_event__process_sample(struct perf_tool *tool,
694                                        const union perf_event *event,
695                                        struct perf_evsel *evsel,
696                                        struct perf_sample *sample,
697                                        struct machine *machine)
698 {
699         struct perf_top *top = container_of(tool, struct perf_top, tool);
700         struct addr_location al;
701         int err;
702 
703         if (!machine && perf_guest) {
704                 static struct intlist *seen;
705 
706                 if (!seen)
707                         seen = intlist__new(NULL);
708 
709                 if (!intlist__has_entry(seen, sample->pid)) {
710                         pr_err("Can't find guest [%d]'s kernel information\n",
711                                 sample->pid);
712                         intlist__add(seen, sample->pid);
713                 }
714                 return;
715         }
716 
717         if (!machine) {
718                 pr_err("%u unprocessable samples recorded.\r",
719                        top->session->stats.nr_unprocessable_samples++);
720                 return;
721         }
722 
723         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
724                 top->exact_samples++;
725 
726         if (perf_event__preprocess_sample(event, machine, &al, sample) < 0)
727                 return;
728 
729         if (!top->kptr_restrict_warned &&
730             symbol_conf.kptr_restrict &&
731             al.cpumode == PERF_RECORD_MISC_KERNEL) {
732                 ui__warning(
733 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
734 "Check /proc/sys/kernel/kptr_restrict.\n\n"
735 "Kernel%s samples will not be resolved.\n",
736                           !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
737                           " modules" : "");
738                 if (use_browser <= 0)
739                         sleep(5);
740                 top->kptr_restrict_warned = true;
741         }
742 
743         if (al.sym == NULL) {
744                 const char *msg = "Kernel samples will not be resolved.\n";
745                 /*
746                  * As we do lazy loading of symtabs we only will know if the
747                  * specified vmlinux file is invalid when we actually have a
748                  * hit in kernel space and then try to load it. So if we get
749                  * here and there are _no_ symbols in the DSO backing the
750                  * kernel map, bail out.
751                  *
752                  * We may never get here, for instance, if we use -K/
753                  * --hide-kernel-symbols, even if the user specifies an
754                  * invalid --vmlinux ;-)
755                  */
756                 if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
757                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
758                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
759                         if (symbol_conf.vmlinux_name) {
760                                 ui__warning("The %s file can't be used.\n%s",
761                                             symbol_conf.vmlinux_name, msg);
762                         } else {
763                                 ui__warning("A vmlinux file was not found.\n%s",
764                                             msg);
765                         }
766 
767                         if (use_browser <= 0)
768                                 sleep(5);
769                         top->vmlinux_warned = true;
770                 }
771         }
772 
773         if (al.sym == NULL || !al.sym->ignore) {
774                 struct hists *hists = evsel__hists(evsel);
775                 struct hist_entry_iter iter = {
776                         .add_entry_cb = hist_iter__top_callback,
777                 };
778 
779                 if (symbol_conf.cumulate_callchain)
780                         iter.ops = &hist_iter_cumulative;
781                 else
782                         iter.ops = &hist_iter_normal;
783 
784                 pthread_mutex_lock(&hists->lock);
785 
786                 err = hist_entry_iter__add(&iter, &al, evsel, sample,
787                                            top->max_stack, top);
788                 if (err < 0)
789                         pr_err("Problem incrementing symbol period, skipping event\n");
790 
791                 pthread_mutex_unlock(&hists->lock);
792         }
793 
794         return;
795 }
796 
797 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
798 {
799         struct perf_sample sample;
800         struct perf_evsel *evsel;
801         struct perf_session *session = top->session;
802         union perf_event *event;
803         struct machine *machine;
804         u8 origin;
805         int ret;
806 
807         while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
808                 ret = perf_evlist__parse_sample(top->evlist, event, &sample);
809                 if (ret) {
810                         pr_err("Can't parse sample, err = %d\n", ret);
811                         goto next_event;
812                 }
813 
814                 evsel = perf_evlist__id2evsel(session->evlist, sample.id);
815                 assert(evsel != NULL);
816 
817                 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
818 
819                 if (event->header.type == PERF_RECORD_SAMPLE)
820                         ++top->samples;
821 
822                 switch (origin) {
823                 case PERF_RECORD_MISC_USER:
824                         ++top->us_samples;
825                         if (top->hide_user_symbols)
826                                 goto next_event;
827                         machine = &session->machines.host;
828                         break;
829                 case PERF_RECORD_MISC_KERNEL:
830                         ++top->kernel_samples;
831                         if (top->hide_kernel_symbols)
832                                 goto next_event;
833                         machine = &session->machines.host;
834                         break;
835                 case PERF_RECORD_MISC_GUEST_KERNEL:
836                         ++top->guest_kernel_samples;
837                         machine = perf_session__find_machine(session,
838                                                              sample.pid);
839                         break;
840                 case PERF_RECORD_MISC_GUEST_USER:
841                         ++top->guest_us_samples;
842                         /*
843                          * TODO: we don't process guest user from host side
844                          * except simple counting.
845                          */
846                         /* Fall thru */
847                 default:
848                         goto next_event;
849                 }
850 
851 
852                 if (event->header.type == PERF_RECORD_SAMPLE) {
853                         perf_event__process_sample(&top->tool, event, evsel,
854                                                    &sample, machine);
855                 } else if (event->header.type < PERF_RECORD_MAX) {
856                         hists__inc_nr_events(evsel__hists(evsel), event->header.type);
857                         machine__process_event(machine, event, &sample);
858                 } else
859                         ++session->stats.nr_unknown_events;
860 next_event:
861                 perf_evlist__mmap_consume(top->evlist, idx);
862         }
863 }
864 
865 static void perf_top__mmap_read(struct perf_top *top)
866 {
867         int i;
868 
869         for (i = 0; i < top->evlist->nr_mmaps; i++)
870                 perf_top__mmap_read_idx(top, i);
871 }
872 
873 static int perf_top__start_counters(struct perf_top *top)
874 {
875         char msg[512];
876         struct perf_evsel *counter;
877         struct perf_evlist *evlist = top->evlist;
878         struct record_opts *opts = &top->record_opts;
879 
880         perf_evlist__config(evlist, opts);
881 
882         evlist__for_each(evlist, counter) {
883 try_again:
884                 if (perf_evsel__open(counter, top->evlist->cpus,
885                                      top->evlist->threads) < 0) {
886                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
887                                 if (verbose)
888                                         ui__warning("%s\n", msg);
889                                 goto try_again;
890                         }
891 
892                         perf_evsel__open_strerror(counter, &opts->target,
893                                                   errno, msg, sizeof(msg));
894                         ui__error("%s\n", msg);
895                         goto out_err;
896                 }
897         }
898 
899         if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
900                 ui__error("Failed to mmap with %d (%s)\n",
901                             errno, strerror_r(errno, msg, sizeof(msg)));
902                 goto out_err;
903         }
904 
905         return 0;
906 
907 out_err:
908         return -1;
909 }
910 
911 static int perf_top__setup_sample_type(struct perf_top *top __maybe_unused)
912 {
913         if (!sort__has_sym) {
914                 if (symbol_conf.use_callchain) {
915                         ui__error("Selected -g but \"sym\" not present in --sort/-s.");
916                         return -EINVAL;
917                 }
918         } else if (callchain_param.mode != CHAIN_NONE) {
919                 if (callchain_register_param(&callchain_param) < 0) {
920                         ui__error("Can't register callchain params.\n");
921                         return -EINVAL;
922                 }
923         }
924 
925         return 0;
926 }
927 
928 static int __cmd_top(struct perf_top *top)
929 {
930         struct record_opts *opts = &top->record_opts;
931         pthread_t thread;
932         int ret;
933 
934         top->session = perf_session__new(NULL, false, NULL);
935         if (top->session == NULL)
936                 return -1;
937 
938         machines__set_symbol_filter(&top->session->machines, symbol_filter);
939 
940         if (!objdump_path) {
941                 ret = perf_session_env__lookup_objdump(&top->session->header.env);
942                 if (ret)
943                         goto out_delete;
944         }
945 
946         ret = perf_top__setup_sample_type(top);
947         if (ret)
948                 goto out_delete;
949 
950         machine__synthesize_threads(&top->session->machines.host, &opts->target,
951                                     top->evlist->threads, false);
952         ret = perf_top__start_counters(top);
953         if (ret)
954                 goto out_delete;
955 
956         top->session->evlist = top->evlist;
957         perf_session__set_id_hdr_size(top->session);
958 
959         /*
960          * When perf is starting the traced process, all the events (apart from
961          * group members) have enable_on_exec=1 set, so don't spoil it by
962          * prematurely enabling them.
963          *
964          * XXX 'top' still doesn't start workloads like record, trace, but should,
965          * so leave the check here.
966          */
967         if (!target__none(&opts->target))
968                 perf_evlist__enable(top->evlist);
969 
970         /* Wait for a minimal set of events before starting the snapshot */
971         perf_evlist__poll(top->evlist, 100);
972 
973         perf_top__mmap_read(top);
974 
975         ret = -1;
976         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
977                                                             display_thread), top)) {
978                 ui__error("Could not create display thread.\n");
979                 goto out_delete;
980         }
981 
982         if (top->realtime_prio) {
983                 struct sched_param param;
984 
985                 param.sched_priority = top->realtime_prio;
986                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
987                         ui__error("Could not set realtime priority.\n");
988                         goto out_join;
989                 }
990         }
991 
992         while (!done) {
993                 u64 hits = top->samples;
994 
995                 perf_top__mmap_read(top);
996 
997                 if (hits == top->samples)
998                         ret = perf_evlist__poll(top->evlist, 100);
999         }
1000 
1001         ret = 0;
1002 out_join:
1003         pthread_join(thread, NULL);
1004 out_delete:
1005         perf_session__delete(top->session);
1006         top->session = NULL;
1007 
1008         return ret;
1009 }
1010 
1011 static int
1012 callchain_opt(const struct option *opt, const char *arg, int unset)
1013 {
1014         symbol_conf.use_callchain = true;
1015         return record_callchain_opt(opt, arg, unset);
1016 }
1017 
1018 static int
1019 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1020 {
1021         symbol_conf.use_callchain = true;
1022         return record_parse_callchain_opt(opt, arg, unset);
1023 }
1024 
1025 static int perf_top_config(const char *var, const char *value, void *cb)
1026 {
1027         if (!strcmp(var, "top.call-graph"))
1028                 var = "call-graph.record-mode"; /* fall-through */
1029         if (!strcmp(var, "top.children")) {
1030                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1031                 return 0;
1032         }
1033 
1034         return perf_default_config(var, value, cb);
1035 }
1036 
1037 static int
1038 parse_percent_limit(const struct option *opt, const char *arg,
1039                     int unset __maybe_unused)
1040 {
1041         struct perf_top *top = opt->value;
1042 
1043         top->min_percent = strtof(arg, NULL);
1044         return 0;
1045 }
1046 
1047 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
1048 {
1049         char errbuf[BUFSIZ];
1050         struct perf_top top = {
1051                 .count_filter        = 5,
1052                 .delay_secs          = 2,
1053                 .record_opts = {
1054                         .mmap_pages     = UINT_MAX,
1055                         .user_freq      = UINT_MAX,
1056                         .user_interval  = ULLONG_MAX,
1057                         .freq           = 4000, /* 4 KHz */
1058                         .target         = {
1059                                 .uses_mmap   = true,
1060                         },
1061                 },
1062                 .max_stack           = PERF_MAX_STACK_DEPTH,
1063                 .sym_pcnt_filter     = 5,
1064         };
1065         struct record_opts *opts = &top.record_opts;
1066         struct target *target = &opts->target;
1067         const struct option options[] = {
1068         OPT_CALLBACK('e', "event", &top.evlist, "event",
1069                      "event selector. use 'perf list' to list available events",
1070                      parse_events_option),
1071         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1072         OPT_STRING('p', "pid", &target->pid, "pid",
1073                     "profile events on existing process id"),
1074         OPT_STRING('t', "tid", &target->tid, "tid",
1075                     "profile events on existing thread id"),
1076         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1077                             "system-wide collection from all CPUs"),
1078         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1079                     "list of cpus to monitor"),
1080         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1081                    "file", "vmlinux pathname"),
1082         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1083                     "don't load vmlinux even if found"),
1084         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1085                     "hide kernel symbols"),
1086         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1087                      "number of mmap data pages",
1088                      perf_evlist__parse_mmap_pages),
1089         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1090                     "collect data with this RT SCHED_FIFO priority"),
1091         OPT_INTEGER('d', "delay", &top.delay_secs,
1092                     "number of seconds to delay between refreshes"),
1093         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1094                             "dump the symbol table used for profiling"),
1095         OPT_INTEGER('f', "count-filter", &top.count_filter,
1096                     "only display functions with more events than this"),
1097         OPT_BOOLEAN(0, "group", &opts->group,
1098                             "put the counters into a counter group"),
1099         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1100                     "child tasks do not inherit counters"),
1101         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1102                     "symbol to annotate"),
1103         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1104         OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
1105         OPT_INTEGER('E', "entries", &top.print_entries,
1106                     "display this many functions"),
1107         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1108                     "hide user symbols"),
1109         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1110         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1111         OPT_INCR('v', "verbose", &verbose,
1112                     "be more verbose (show counter open errors, etc)"),
1113         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1114                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1115                    " Please refer the man page for the complete list."),
1116         OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1117                    "output field(s): overhead, period, sample plus all of sort keys"),
1118         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1119                     "Show a column with the number of samples"),
1120         OPT_CALLBACK_NOOPT('g', NULL, &top.record_opts,
1121                            NULL, "enables call-graph recording",
1122                            &callchain_opt),
1123         OPT_CALLBACK(0, "call-graph", &top.record_opts,
1124                      "mode[,dump_size]", record_callchain_help,
1125                      &parse_callchain_opt),
1126         OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1127                     "Accumulate callchains of children and show total overhead as well"),
1128         OPT_INTEGER(0, "max-stack", &top.max_stack,
1129                     "Set the maximum stack depth when parsing the callchain. "
1130                     "Default: " __stringify(PERF_MAX_STACK_DEPTH)),
1131         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1132                    "ignore callees of these functions in call graphs",
1133                    report_parse_ignore_callees_opt),
1134         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1135                     "Show a column with the sum of periods"),
1136         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1137                    "only consider symbols in these dsos"),
1138         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1139                    "only consider symbols in these comms"),
1140         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1141                    "only consider these symbols"),
1142         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1143                     "Interleave source code with assembly code (default)"),
1144         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1145                     "Display raw encoding of assembly instructions (default)"),
1146         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1147                     "Enable kernel symbol demangling"),
1148         OPT_STRING(0, "objdump", &objdump_path, "path",
1149                     "objdump binary to use for disassembly and annotations"),
1150         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1151                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1152         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1153         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1154                      "Don't show entries under that percent", parse_percent_limit),
1155         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1156                      "How to display percentage of filtered entries", parse_filter_percentage),
1157         OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1158                    "width[,width...]",
1159                    "don't try to adjust column width, use these fixed values"),
1160         OPT_END()
1161         };
1162         const char * const top_usage[] = {
1163                 "perf top [<options>]",
1164                 NULL
1165         };
1166         int status = hists__init();
1167 
1168         if (status < 0)
1169                 return status;
1170 
1171         top.evlist = perf_evlist__new();
1172         if (top.evlist == NULL)
1173                 return -ENOMEM;
1174 
1175         perf_config(perf_top_config, &top);
1176 
1177         argc = parse_options(argc, argv, options, top_usage, 0);
1178         if (argc)
1179                 usage_with_options(top_usage, options);
1180 
1181         sort__mode = SORT_MODE__TOP;
1182         /* display thread wants entries to be collapsed in a different tree */
1183         sort__need_collapse = 1;
1184 
1185         if (setup_sorting() < 0) {
1186                 if (sort_order)
1187                         parse_options_usage(top_usage, options, "s", 1);
1188                 if (field_order)
1189                         parse_options_usage(sort_order ? NULL : top_usage,
1190                                             options, "fields", 0);
1191                 goto out_delete_evlist;
1192         }
1193 
1194         if (top.use_stdio)
1195                 use_browser = 0;
1196         else if (top.use_tui)
1197                 use_browser = 1;
1198 
1199         setup_browser(false);
1200 
1201         status = target__validate(target);
1202         if (status) {
1203                 target__strerror(target, status, errbuf, BUFSIZ);
1204                 ui__warning("%s\n", errbuf);
1205         }
1206 
1207         status = target__parse_uid(target);
1208         if (status) {
1209                 int saved_errno = errno;
1210 
1211                 target__strerror(target, status, errbuf, BUFSIZ);
1212                 ui__error("%s\n", errbuf);
1213 
1214                 status = -saved_errno;
1215                 goto out_delete_evlist;
1216         }
1217 
1218         if (target__none(target))
1219                 target->system_wide = true;
1220 
1221         if (perf_evlist__create_maps(top.evlist, target) < 0)
1222                 usage_with_options(top_usage, options);
1223 
1224         if (!top.evlist->nr_entries &&
1225             perf_evlist__add_default(top.evlist) < 0) {
1226                 ui__error("Not enough memory for event selector list\n");
1227                 goto out_delete_evlist;
1228         }
1229 
1230         symbol_conf.nr_events = top.evlist->nr_entries;
1231 
1232         if (top.delay_secs < 1)
1233                 top.delay_secs = 1;
1234 
1235         if (record_opts__config(opts)) {
1236                 status = -EINVAL;
1237                 goto out_delete_evlist;
1238         }
1239 
1240         top.sym_evsel = perf_evlist__first(top.evlist);
1241 
1242         if (!symbol_conf.use_callchain) {
1243                 symbol_conf.cumulate_callchain = false;
1244                 perf_hpp__cancel_cumulate();
1245         }
1246 
1247         symbol_conf.priv_size = sizeof(struct annotation);
1248 
1249         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1250         if (symbol__init(NULL) < 0)
1251                 return -1;
1252 
1253         sort__setup_elide(stdout);
1254 
1255         get_term_dimensions(&top.winsize);
1256         if (top.print_entries == 0) {
1257                 struct sigaction act = {
1258                         .sa_sigaction = perf_top__sig_winch,
1259                         .sa_flags     = SA_SIGINFO,
1260                 };
1261                 perf_top__update_print_entries(&top);
1262                 sigaction(SIGWINCH, &act, NULL);
1263         }
1264 
1265         status = __cmd_top(&top);
1266 
1267 out_delete_evlist:
1268         perf_evlist__delete(top.evlist);
1269 
1270         return status;
1271 }
1272 

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