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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 <sys/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/unistd.h>
 70 #include <linux/types.h>
 71 
 72 static volatile int done;
 73 
 74 #define HEADER_LINE_NR  5
 75 
 76 static void perf_top__update_print_entries(struct perf_top *top)
 77 {
 78         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
 79 }
 80 
 81 static void perf_top__sig_winch(int sig __maybe_unused,
 82                                 siginfo_t *info __maybe_unused, void *arg)
 83 {
 84         struct perf_top *top = arg;
 85 
 86         get_term_dimensions(&top->winsize);
 87         perf_top__update_print_entries(top);
 88 }
 89 
 90 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 91 {
 92         struct symbol *sym;
 93         struct annotation *notes;
 94         struct map *map;
 95         int err = -1;
 96 
 97         if (!he || !he->ms.sym)
 98                 return -1;
 99 
100         sym = he->ms.sym;
101         map = he->ms.map;
102 
103         /*
104          * We can't annotate with just /proc/kallsyms
105          */
106         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
107             !dso__is_kcore(map->dso)) {
108                 pr_err("Can't annotate %s: No vmlinux file was found in the "
109                        "path\n", sym->name);
110                 sleep(1);
111                 return -1;
112         }
113 
114         notes = symbol__annotation(sym);
115         if (notes->src != NULL) {
116                 pthread_mutex_lock(&notes->lock);
117                 goto out_assign;
118         }
119 
120         pthread_mutex_lock(&notes->lock);
121 
122         if (symbol__alloc_hist(sym) < 0) {
123                 pthread_mutex_unlock(&notes->lock);
124                 pr_err("Not enough memory for annotating '%s' symbol!\n",
125                        sym->name);
126                 sleep(1);
127                 return err;
128         }
129 
130         err = symbol__annotate(sym, map, 0);
131         if (err == 0) {
132 out_assign:
133                 top->sym_filter_entry = he;
134         }
135 
136         pthread_mutex_unlock(&notes->lock);
137         return err;
138 }
139 
140 static void __zero_source_counters(struct hist_entry *he)
141 {
142         struct symbol *sym = he->ms.sym;
143         symbol__annotate_zero_histograms(sym);
144 }
145 
146 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
147 {
148         struct utsname uts;
149         int err = uname(&uts);
150 
151         ui__warning("Out of bounds address found:\n\n"
152                     "Addr:   %" PRIx64 "\n"
153                     "DSO:    %s %c\n"
154                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
155                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
156                     "Arch:   %s\n"
157                     "Kernel: %s\n"
158                     "Tools:  %s\n\n"
159                     "Not all samples will be on the annotation output.\n\n"
160                     "Please report to linux-kernel@vger.kernel.org\n",
161                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
162                     map->start, map->end, sym->start, sym->end,
163                     sym->binding == STB_GLOBAL ? 'g' :
164                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
165                     err ? "[unknown]" : uts.machine,
166                     err ? "[unknown]" : uts.release, perf_version_string);
167         if (use_browser <= 0)
168                 sleep(5);
169         
170         map->erange_warned = true;
171 }
172 
173 static void perf_top__record_precise_ip(struct perf_top *top,
174                                         struct hist_entry *he,
175                                         int counter, u64 ip)
176 {
177         struct annotation *notes;
178         struct symbol *sym;
179         int err;
180 
181         if (he == NULL || he->ms.sym == NULL ||
182             ((top->sym_filter_entry == NULL ||
183               top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
184                 return;
185 
186         sym = he->ms.sym;
187         notes = symbol__annotation(sym);
188 
189         if (pthread_mutex_trylock(&notes->lock))
190                 return;
191 
192         if (notes->src == NULL && symbol__alloc_hist(sym) < 0) {
193                 pthread_mutex_unlock(&notes->lock);
194                 pr_err("Not enough memory for annotating '%s' symbol!\n",
195                        sym->name);
196                 sleep(1);
197                 return;
198         }
199 
200         ip = he->ms.map->map_ip(he->ms.map, ip);
201         err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
202 
203         pthread_mutex_unlock(&notes->lock);
204 
205         if (err == -ERANGE && !he->ms.map->erange_warned)
206                 ui__warn_map_erange(he->ms.map, sym, ip);
207 }
208 
209 static void perf_top__show_details(struct perf_top *top)
210 {
211         struct hist_entry *he = top->sym_filter_entry;
212         struct annotation *notes;
213         struct symbol *symbol;
214         int more;
215 
216         if (!he)
217                 return;
218 
219         symbol = he->ms.sym;
220         notes = symbol__annotation(symbol);
221 
222         pthread_mutex_lock(&notes->lock);
223 
224         if (notes->src == NULL)
225                 goto out_unlock;
226 
227         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
228         printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
229 
230         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel,
231                                        0, top->sym_pcnt_filter, top->print_entries, 4);
232         if (top->zero)
233                 symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
234         else
235                 symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
236         if (more != 0)
237                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
238 out_unlock:
239         pthread_mutex_unlock(&notes->lock);
240 }
241 
242 static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
243                                                      struct addr_location *al,
244                                                      struct perf_sample *sample)
245 {
246         struct hist_entry *he;
247 
248         pthread_mutex_lock(&evsel->hists.lock);
249         he = __hists__add_entry(&evsel->hists, al, NULL, NULL, NULL,
250                                 sample->period, sample->weight,
251                                 sample->transaction);
252         pthread_mutex_unlock(&evsel->hists.lock);
253         if (he == NULL)
254                 return NULL;
255 
256         hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
257         return he;
258 }
259 
260 static void perf_top__print_sym_table(struct perf_top *top)
261 {
262         char bf[160];
263         int printed = 0;
264         const int win_width = top->winsize.ws_col - 1;
265 
266         puts(CONSOLE_CLEAR);
267 
268         perf_top__header_snprintf(top, bf, sizeof(bf));
269         printf("%s\n", bf);
270 
271         perf_top__reset_sample_counters(top);
272 
273         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
274 
275         if (top->sym_evsel->hists.stats.nr_lost_warned !=
276             top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
277                 top->sym_evsel->hists.stats.nr_lost_warned =
278                         top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
279                 color_fprintf(stdout, PERF_COLOR_RED,
280                               "WARNING: LOST %d chunks, Check IO/CPU overload",
281                               top->sym_evsel->hists.stats.nr_lost_warned);
282                 ++printed;
283         }
284 
285         if (top->sym_filter_entry) {
286                 perf_top__show_details(top);
287                 return;
288         }
289 
290         hists__collapse_resort(&top->sym_evsel->hists, NULL);
291         hists__output_resort(&top->sym_evsel->hists);
292         hists__decay_entries(&top->sym_evsel->hists,
293                              top->hide_user_symbols,
294                              top->hide_kernel_symbols);
295         hists__output_recalc_col_len(&top->sym_evsel->hists,
296                                      top->print_entries - printed);
297         putchar('\n');
298         hists__fprintf(&top->sym_evsel->hists, false,
299                        top->print_entries - printed, win_width,
300                        top->min_percent, stdout);
301 }
302 
303 static void prompt_integer(int *target, const char *msg)
304 {
305         char *buf = malloc(0), *p;
306         size_t dummy = 0;
307         int tmp;
308 
309         fprintf(stdout, "\n%s: ", msg);
310         if (getline(&buf, &dummy, stdin) < 0)
311                 return;
312 
313         p = strchr(buf, '\n');
314         if (p)
315                 *p = 0;
316 
317         p = buf;
318         while(*p) {
319                 if (!isdigit(*p))
320                         goto out_free;
321                 p++;
322         }
323         tmp = strtoul(buf, NULL, 10);
324         *target = tmp;
325 out_free:
326         free(buf);
327 }
328 
329 static void prompt_percent(int *target, const char *msg)
330 {
331         int tmp = 0;
332 
333         prompt_integer(&tmp, msg);
334         if (tmp >= 0 && tmp <= 100)
335                 *target = tmp;
336 }
337 
338 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
339 {
340         char *buf = malloc(0), *p;
341         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
342         struct rb_node *next;
343         size_t dummy = 0;
344 
345         /* zero counters of active symbol */
346         if (syme) {
347                 __zero_source_counters(syme);
348                 top->sym_filter_entry = NULL;
349         }
350 
351         fprintf(stdout, "\n%s: ", msg);
352         if (getline(&buf, &dummy, stdin) < 0)
353                 goto out_free;
354 
355         p = strchr(buf, '\n');
356         if (p)
357                 *p = 0;
358 
359         next = rb_first(&top->sym_evsel->hists.entries);
360         while (next) {
361                 n = rb_entry(next, struct hist_entry, rb_node);
362                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
363                         found = n;
364                         break;
365                 }
366                 next = rb_next(&n->rb_node);
367         }
368 
369         if (!found) {
370                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
371                 sleep(1);
372         } else
373                 perf_top__parse_source(top, found);
374 
375 out_free:
376         free(buf);
377 }
378 
379 static void perf_top__print_mapped_keys(struct perf_top *top)
380 {
381         char *name = NULL;
382 
383         if (top->sym_filter_entry) {
384                 struct symbol *sym = top->sym_filter_entry->ms.sym;
385                 name = sym->name;
386         }
387 
388         fprintf(stdout, "\nMapped keys:\n");
389         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
390         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
391 
392         if (top->evlist->nr_entries > 1)
393                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
394 
395         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
396 
397         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
398         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
399         fprintf(stdout, "\t[S]     stop annotation.\n");
400 
401         fprintf(stdout,
402                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
403                 top->hide_kernel_symbols ? "yes" : "no");
404         fprintf(stdout,
405                 "\t[U]     hide user symbols.               \t(%s)\n",
406                 top->hide_user_symbols ? "yes" : "no");
407         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
408         fprintf(stdout, "\t[qQ]    quit.\n");
409 }
410 
411 static int perf_top__key_mapped(struct perf_top *top, int c)
412 {
413         switch (c) {
414                 case 'd':
415                 case 'e':
416                 case 'f':
417                 case 'z':
418                 case 'q':
419                 case 'Q':
420                 case 'K':
421                 case 'U':
422                 case 'F':
423                 case 's':
424                 case 'S':
425                         return 1;
426                 case 'E':
427                         return top->evlist->nr_entries > 1 ? 1 : 0;
428                 default:
429                         break;
430         }
431 
432         return 0;
433 }
434 
435 static bool perf_top__handle_keypress(struct perf_top *top, int c)
436 {
437         bool ret = true;
438 
439         if (!perf_top__key_mapped(top, c)) {
440                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
441                 struct termios tc, save;
442 
443                 perf_top__print_mapped_keys(top);
444                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
445                 fflush(stdout);
446 
447                 tcgetattr(0, &save);
448                 tc = save;
449                 tc.c_lflag &= ~(ICANON | ECHO);
450                 tc.c_cc[VMIN] = 0;
451                 tc.c_cc[VTIME] = 0;
452                 tcsetattr(0, TCSANOW, &tc);
453 
454                 poll(&stdin_poll, 1, -1);
455                 c = getc(stdin);
456 
457                 tcsetattr(0, TCSAFLUSH, &save);
458                 if (!perf_top__key_mapped(top, c))
459                         return ret;
460         }
461 
462         switch (c) {
463                 case 'd':
464                         prompt_integer(&top->delay_secs, "Enter display delay");
465                         if (top->delay_secs < 1)
466                                 top->delay_secs = 1;
467                         break;
468                 case 'e':
469                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
470                         if (top->print_entries == 0) {
471                                 struct sigaction act = {
472                                         .sa_sigaction = perf_top__sig_winch,
473                                         .sa_flags     = SA_SIGINFO,
474                                 };
475                                 perf_top__sig_winch(SIGWINCH, NULL, top);
476                                 sigaction(SIGWINCH, &act, NULL);
477                         } else {
478                                 signal(SIGWINCH, SIG_DFL);
479                         }
480                         break;
481                 case 'E':
482                         if (top->evlist->nr_entries > 1) {
483                                 /* Select 0 as the default event: */
484                                 int counter = 0;
485 
486                                 fprintf(stderr, "\nAvailable events:");
487 
488                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
489                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
490 
491                                 prompt_integer(&counter, "Enter details event counter");
492 
493                                 if (counter >= top->evlist->nr_entries) {
494                                         top->sym_evsel = perf_evlist__first(top->evlist);
495                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
496                                         sleep(1);
497                                         break;
498                                 }
499                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
500                                         if (top->sym_evsel->idx == counter)
501                                                 break;
502                         } else
503                                 top->sym_evsel = perf_evlist__first(top->evlist);
504                         break;
505                 case 'f':
506                         prompt_integer(&top->count_filter, "Enter display event count filter");
507                         break;
508                 case 'F':
509                         prompt_percent(&top->sym_pcnt_filter,
510                                        "Enter details display event filter (percent)");
511                         break;
512                 case 'K':
513                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
514                         break;
515                 case 'q':
516                 case 'Q':
517                         printf("exiting.\n");
518                         if (top->dump_symtab)
519                                 perf_session__fprintf_dsos(top->session, stderr);
520                         ret = false;
521                         break;
522                 case 's':
523                         perf_top__prompt_symbol(top, "Enter details symbol");
524                         break;
525                 case 'S':
526                         if (!top->sym_filter_entry)
527                                 break;
528                         else {
529                                 struct hist_entry *syme = top->sym_filter_entry;
530 
531                                 top->sym_filter_entry = NULL;
532                                 __zero_source_counters(syme);
533                         }
534                         break;
535                 case 'U':
536                         top->hide_user_symbols = !top->hide_user_symbols;
537                         break;
538                 case 'z':
539                         top->zero = !top->zero;
540                         break;
541                 default:
542                         break;
543         }
544 
545         return ret;
546 }
547 
548 static void perf_top__sort_new_samples(void *arg)
549 {
550         struct perf_top *t = arg;
551         perf_top__reset_sample_counters(t);
552 
553         if (t->evlist->selected != NULL)
554                 t->sym_evsel = t->evlist->selected;
555 
556         hists__collapse_resort(&t->sym_evsel->hists, NULL);
557         hists__output_resort(&t->sym_evsel->hists);
558         hists__decay_entries(&t->sym_evsel->hists,
559                              t->hide_user_symbols,
560                              t->hide_kernel_symbols);
561 }
562 
563 static void *display_thread_tui(void *arg)
564 {
565         struct perf_evsel *pos;
566         struct perf_top *top = arg;
567         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
568         struct hist_browser_timer hbt = {
569                 .timer          = perf_top__sort_new_samples,
570                 .arg            = top,
571                 .refresh        = top->delay_secs,
572         };
573 
574         perf_top__sort_new_samples(top);
575 
576         /*
577          * Initialize the uid_filter_str, in the future the TUI will allow
578          * Zooming in/out UIDs. For now juse use whatever the user passed
579          * via --uid.
580          */
581         list_for_each_entry(pos, &top->evlist->entries, node)
582                 pos->hists.uid_filter_str = top->record_opts.target.uid_str;
583 
584         perf_evlist__tui_browse_hists(top->evlist, help, &hbt, top->min_percent,
585                                       &top->session->header.env);
586 
587         done = 1;
588         return NULL;
589 }
590 
591 static void *display_thread(void *arg)
592 {
593         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
594         struct termios tc, save;
595         struct perf_top *top = arg;
596         int delay_msecs, c;
597 
598         tcgetattr(0, &save);
599         tc = save;
600         tc.c_lflag &= ~(ICANON | ECHO);
601         tc.c_cc[VMIN] = 0;
602         tc.c_cc[VTIME] = 0;
603 
604         pthread__unblock_sigwinch();
605 repeat:
606         delay_msecs = top->delay_secs * 1000;
607         tcsetattr(0, TCSANOW, &tc);
608         /* trash return*/
609         getc(stdin);
610 
611         while (!done) {
612                 perf_top__print_sym_table(top);
613                 /*
614                  * Either timeout expired or we got an EINTR due to SIGWINCH,
615                  * refresh screen in both cases.
616                  */
617                 switch (poll(&stdin_poll, 1, delay_msecs)) {
618                 case 0:
619                         continue;
620                 case -1:
621                         if (errno == EINTR)
622                                 continue;
623                         /* Fall trhu */
624                 default:
625                         c = getc(stdin);
626                         tcsetattr(0, TCSAFLUSH, &save);
627 
628                         if (perf_top__handle_keypress(top, c))
629                                 goto repeat;
630                         done = 1;
631                 }
632         }
633 
634         return NULL;
635 }
636 
637 /* Tag samples to be skipped. */
638 static const char *skip_symbols[] = {
639         "intel_idle",
640         "default_idle",
641         "native_safe_halt",
642         "cpu_idle",
643         "enter_idle",
644         "exit_idle",
645         "mwait_idle",
646         "mwait_idle_with_hints",
647         "poll_idle",
648         "ppc64_runlatch_off",
649         "pseries_dedicated_idle_sleep",
650         NULL
651 };
652 
653 static int symbol_filter(struct map *map __maybe_unused, struct symbol *sym)
654 {
655         const char *name = sym->name;
656         int i;
657 
658         /*
659          * ppc64 uses function descriptors and appends a '.' to the
660          * start of every instruction address. Remove it.
661          */
662         if (name[0] == '.')
663                 name++;
664 
665         if (!strcmp(name, "_text") ||
666             !strcmp(name, "_etext") ||
667             !strcmp(name, "_sinittext") ||
668             !strncmp("init_module", name, 11) ||
669             !strncmp("cleanup_module", name, 14) ||
670             strstr(name, "_text_start") ||
671             strstr(name, "_text_end"))
672                 return 1;
673 
674         for (i = 0; skip_symbols[i]; i++) {
675                 if (!strcmp(skip_symbols[i], name)) {
676                         sym->ignore = true;
677                         break;
678                 }
679         }
680 
681         return 0;
682 }
683 
684 static void perf_event__process_sample(struct perf_tool *tool,
685                                        const union perf_event *event,
686                                        struct perf_evsel *evsel,
687                                        struct perf_sample *sample,
688                                        struct machine *machine)
689 {
690         struct perf_top *top = container_of(tool, struct perf_top, tool);
691         struct symbol *parent = NULL;
692         u64 ip = sample->ip;
693         struct addr_location al;
694         int err;
695 
696         if (!machine && perf_guest) {
697                 static struct intlist *seen;
698 
699                 if (!seen)
700                         seen = intlist__new(NULL);
701 
702                 if (!intlist__has_entry(seen, sample->pid)) {
703                         pr_err("Can't find guest [%d]'s kernel information\n",
704                                 sample->pid);
705                         intlist__add(seen, sample->pid);
706                 }
707                 return;
708         }
709 
710         if (!machine) {
711                 pr_err("%u unprocessable samples recorded.\r",
712                        top->session->stats.nr_unprocessable_samples++);
713                 return;
714         }
715 
716         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
717                 top->exact_samples++;
718 
719         if (perf_event__preprocess_sample(event, machine, &al, sample) < 0 ||
720             al.filtered)
721                 return;
722 
723         if (!top->kptr_restrict_warned &&
724             symbol_conf.kptr_restrict &&
725             al.cpumode == PERF_RECORD_MISC_KERNEL) {
726                 ui__warning(
727 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
728 "Check /proc/sys/kernel/kptr_restrict.\n\n"
729 "Kernel%s samples will not be resolved.\n",
730                           !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
731                           " modules" : "");
732                 if (use_browser <= 0)
733                         sleep(5);
734                 top->kptr_restrict_warned = true;
735         }
736 
737         if (al.sym == NULL) {
738                 const char *msg = "Kernel samples will not be resolved.\n";
739                 /*
740                  * As we do lazy loading of symtabs we only will know if the
741                  * specified vmlinux file is invalid when we actually have a
742                  * hit in kernel space and then try to load it. So if we get
743                  * here and there are _no_ symbols in the DSO backing the
744                  * kernel map, bail out.
745                  *
746                  * We may never get here, for instance, if we use -K/
747                  * --hide-kernel-symbols, even if the user specifies an
748                  * invalid --vmlinux ;-)
749                  */
750                 if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
751                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
752                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
753                         if (symbol_conf.vmlinux_name) {
754                                 ui__warning("The %s file can't be used.\n%s",
755                                             symbol_conf.vmlinux_name, msg);
756                         } else {
757                                 ui__warning("A vmlinux file was not found.\n%s",
758                                             msg);
759                         }
760 
761                         if (use_browser <= 0)
762                                 sleep(5);
763                         top->vmlinux_warned = true;
764                 }
765         }
766 
767         if (al.sym == NULL || !al.sym->ignore) {
768                 struct hist_entry *he;
769 
770                 if ((sort__has_parent || symbol_conf.use_callchain) &&
771                     sample->callchain) {
772                         err = machine__resolve_callchain(machine, evsel,
773                                                          al.thread, sample,
774                                                          &parent, &al,
775                                                          top->max_stack);
776                         if (err)
777                                 return;
778                 }
779 
780                 he = perf_evsel__add_hist_entry(evsel, &al, sample);
781                 if (he == NULL) {
782                         pr_err("Problem incrementing symbol period, skipping event\n");
783                         return;
784                 }
785 
786                 if (symbol_conf.use_callchain) {
787                         err = callchain_append(he->callchain, &callchain_cursor,
788                                                sample->period);
789                         if (err)
790                                 return;
791                 }
792 
793                 if (sort__has_sym)
794                         perf_top__record_precise_ip(top, he, evsel->idx, ip);
795         }
796 
797         return;
798 }
799 
800 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
801 {
802         struct perf_sample sample;
803         struct perf_evsel *evsel;
804         struct perf_session *session = top->session;
805         union perf_event *event;
806         struct machine *machine;
807         u8 origin;
808         int ret;
809 
810         while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
811                 ret = perf_evlist__parse_sample(top->evlist, event, &sample);
812                 if (ret) {
813                         pr_err("Can't parse sample, err = %d\n", ret);
814                         goto next_event;
815                 }
816 
817                 evsel = perf_evlist__id2evsel(session->evlist, sample.id);
818                 assert(evsel != NULL);
819 
820                 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
821 
822                 if (event->header.type == PERF_RECORD_SAMPLE)
823                         ++top->samples;
824 
825                 switch (origin) {
826                 case PERF_RECORD_MISC_USER:
827                         ++top->us_samples;
828                         if (top->hide_user_symbols)
829                                 goto next_event;
830                         machine = &session->machines.host;
831                         break;
832                 case PERF_RECORD_MISC_KERNEL:
833                         ++top->kernel_samples;
834                         if (top->hide_kernel_symbols)
835                                 goto next_event;
836                         machine = &session->machines.host;
837                         break;
838                 case PERF_RECORD_MISC_GUEST_KERNEL:
839                         ++top->guest_kernel_samples;
840                         machine = perf_session__find_machine(session,
841                                                              sample.pid);
842                         break;
843                 case PERF_RECORD_MISC_GUEST_USER:
844                         ++top->guest_us_samples;
845                         /*
846                          * TODO: we don't process guest user from host side
847                          * except simple counting.
848                          */
849                         /* Fall thru */
850                 default:
851                         goto next_event;
852                 }
853 
854 
855                 if (event->header.type == PERF_RECORD_SAMPLE) {
856                         perf_event__process_sample(&top->tool, event, evsel,
857                                                    &sample, machine);
858                 } else if (event->header.type < PERF_RECORD_MAX) {
859                         hists__inc_nr_events(&evsel->hists, event->header.type);
860                         machine__process_event(machine, event, &sample);
861                 } else
862                         ++session->stats.nr_unknown_events;
863 next_event:
864                 perf_evlist__mmap_consume(top->evlist, idx);
865         }
866 }
867 
868 static void perf_top__mmap_read(struct perf_top *top)
869 {
870         int i;
871 
872         for (i = 0; i < top->evlist->nr_mmaps; i++)
873                 perf_top__mmap_read_idx(top, i);
874 }
875 
876 static int perf_top__start_counters(struct perf_top *top)
877 {
878         char msg[512];
879         struct perf_evsel *counter;
880         struct perf_evlist *evlist = top->evlist;
881         struct perf_record_opts *opts = &top->record_opts;
882 
883         perf_evlist__config(evlist, opts);
884 
885         list_for_each_entry(counter, &evlist->entries, node) {
886 try_again:
887                 if (perf_evsel__open(counter, top->evlist->cpus,
888                                      top->evlist->threads) < 0) {
889                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
890                                 if (verbose)
891                                         ui__warning("%s\n", msg);
892                                 goto try_again;
893                         }
894 
895                         perf_evsel__open_strerror(counter, &opts->target,
896                                                   errno, msg, sizeof(msg));
897                         ui__error("%s\n", msg);
898                         goto out_err;
899                 }
900         }
901 
902         if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
903                 ui__error("Failed to mmap with %d (%s)\n",
904                             errno, strerror(errno));
905                 goto out_err;
906         }
907 
908         return 0;
909 
910 out_err:
911         return -1;
912 }
913 
914 static int perf_top__setup_sample_type(struct perf_top *top __maybe_unused)
915 {
916         if (!sort__has_sym) {
917                 if (symbol_conf.use_callchain) {
918                         ui__error("Selected -g but \"sym\" not present in --sort/-s.");
919                         return -EINVAL;
920                 }
921         } else if (callchain_param.mode != CHAIN_NONE) {
922                 if (callchain_register_param(&callchain_param) < 0) {
923                         ui__error("Can't register callchain params.\n");
924                         return -EINVAL;
925                 }
926         }
927 
928         return 0;
929 }
930 
931 static int __cmd_top(struct perf_top *top)
932 {
933         struct perf_record_opts *opts = &top->record_opts;
934         pthread_t thread;
935         int ret;
936 
937         top->session = perf_session__new(NULL, false, NULL);
938         if (top->session == NULL)
939                 return -ENOMEM;
940 
941         machines__set_symbol_filter(&top->session->machines, symbol_filter);
942 
943         if (!objdump_path) {
944                 ret = perf_session_env__lookup_objdump(&top->session->header.env);
945                 if (ret)
946                         goto out_delete;
947         }
948 
949         ret = perf_top__setup_sample_type(top);
950         if (ret)
951                 goto out_delete;
952 
953         machine__synthesize_threads(&top->session->machines.host, &opts->target,
954                                     top->evlist->threads, false);
955         ret = perf_top__start_counters(top);
956         if (ret)
957                 goto out_delete;
958 
959         top->session->evlist = top->evlist;
960         perf_session__set_id_hdr_size(top->session);
961 
962         /*
963          * When perf is starting the traced process, all the events (apart from
964          * group members) have enable_on_exec=1 set, so don't spoil it by
965          * prematurely enabling them.
966          *
967          * XXX 'top' still doesn't start workloads like record, trace, but should,
968          * so leave the check here.
969          */
970         if (!target__none(&opts->target))
971                 perf_evlist__enable(top->evlist);
972 
973         /* Wait for a minimal set of events before starting the snapshot */
974         poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
975 
976         perf_top__mmap_read(top);
977 
978         ret = -1;
979         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
980                                                             display_thread), top)) {
981                 ui__error("Could not create display thread.\n");
982                 goto out_delete;
983         }
984 
985         if (top->realtime_prio) {
986                 struct sched_param param;
987 
988                 param.sched_priority = top->realtime_prio;
989                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
990                         ui__error("Could not set realtime priority.\n");
991                         goto out_delete;
992                 }
993         }
994 
995         while (!done) {
996                 u64 hits = top->samples;
997 
998                 perf_top__mmap_read(top);
999 
1000                 if (hits == top->samples)
1001                         ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1002         }
1003 
1004         ret = 0;
1005 out_delete:
1006         perf_session__delete(top->session);
1007         top->session = NULL;
1008 
1009         return ret;
1010 }
1011 
1012 static int
1013 callchain_opt(const struct option *opt, const char *arg, int unset)
1014 {
1015         symbol_conf.use_callchain = true;
1016         return record_callchain_opt(opt, arg, unset);
1017 }
1018 
1019 static int
1020 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1021 {
1022         symbol_conf.use_callchain = true;
1023         return record_parse_callchain_opt(opt, arg, unset);
1024 }
1025 
1026 static int
1027 parse_percent_limit(const struct option *opt, const char *arg,
1028                     int unset __maybe_unused)
1029 {
1030         struct perf_top *top = opt->value;
1031 
1032         top->min_percent = strtof(arg, NULL);
1033         return 0;
1034 }
1035 
1036 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
1037 {
1038         int status = -1;
1039         char errbuf[BUFSIZ];
1040         struct perf_top top = {
1041                 .count_filter        = 5,
1042                 .delay_secs          = 2,
1043                 .record_opts = {
1044                         .mmap_pages     = UINT_MAX,
1045                         .user_freq      = UINT_MAX,
1046                         .user_interval  = ULLONG_MAX,
1047                         .freq           = 4000, /* 4 KHz */
1048                         .target         = {
1049                                 .uses_mmap   = true,
1050                         },
1051                 },
1052                 .max_stack           = PERF_MAX_STACK_DEPTH,
1053                 .sym_pcnt_filter     = 5,
1054         };
1055         struct perf_record_opts *opts = &top.record_opts;
1056         struct target *target = &opts->target;
1057         const struct option options[] = {
1058         OPT_CALLBACK('e', "event", &top.evlist, "event",
1059                      "event selector. use 'perf list' to list available events",
1060                      parse_events_option),
1061         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1062         OPT_STRING('p', "pid", &target->pid, "pid",
1063                     "profile events on existing process id"),
1064         OPT_STRING('t', "tid", &target->tid, "tid",
1065                     "profile events on existing thread id"),
1066         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1067                             "system-wide collection from all CPUs"),
1068         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1069                     "list of cpus to monitor"),
1070         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1071                    "file", "vmlinux pathname"),
1072         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1073                     "don't load vmlinux even if found"),
1074         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1075                     "hide kernel symbols"),
1076         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1077                      "number of mmap data pages",
1078                      perf_evlist__parse_mmap_pages),
1079         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1080                     "collect data with this RT SCHED_FIFO priority"),
1081         OPT_INTEGER('d', "delay", &top.delay_secs,
1082                     "number of seconds to delay between refreshes"),
1083         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1084                             "dump the symbol table used for profiling"),
1085         OPT_INTEGER('f', "count-filter", &top.count_filter,
1086                     "only display functions with more events than this"),
1087         OPT_BOOLEAN('g', "group", &opts->group,
1088                             "put the counters into a counter group"),
1089         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1090                     "child tasks do not inherit counters"),
1091         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1092                     "symbol to annotate"),
1093         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1094         OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
1095         OPT_INTEGER('E', "entries", &top.print_entries,
1096                     "display this many functions"),
1097         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1098                     "hide user symbols"),
1099         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1100         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1101         OPT_INCR('v', "verbose", &verbose,
1102                     "be more verbose (show counter open errors, etc)"),
1103         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1104                    "sort by key(s): pid, comm, dso, symbol, parent, weight, local_weight,"
1105                    " abort, in_tx, transaction"),
1106         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1107                     "Show a column with the number of samples"),
1108         OPT_CALLBACK_NOOPT('G', NULL, &top.record_opts,
1109                            NULL, "enables call-graph recording",
1110                            &callchain_opt),
1111         OPT_CALLBACK(0, "call-graph", &top.record_opts,
1112                      "mode[,dump_size]", record_callchain_help,
1113                      &parse_callchain_opt),
1114         OPT_INTEGER(0, "max-stack", &top.max_stack,
1115                     "Set the maximum stack depth when parsing the callchain. "
1116                     "Default: " __stringify(PERF_MAX_STACK_DEPTH)),
1117         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1118                    "ignore callees of these functions in call graphs",
1119                    report_parse_ignore_callees_opt),
1120         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1121                     "Show a column with the sum of periods"),
1122         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1123                    "only consider symbols in these dsos"),
1124         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1125                    "only consider symbols in these comms"),
1126         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1127                    "only consider these symbols"),
1128         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1129                     "Interleave source code with assembly code (default)"),
1130         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1131                     "Display raw encoding of assembly instructions (default)"),
1132         OPT_STRING(0, "objdump", &objdump_path, "path",
1133                     "objdump binary to use for disassembly and annotations"),
1134         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1135                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1136         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1137         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1138                      "Don't show entries under that percent", parse_percent_limit),
1139         OPT_END()
1140         };
1141         const char * const top_usage[] = {
1142                 "perf top [<options>]",
1143                 NULL
1144         };
1145 
1146         top.evlist = perf_evlist__new();
1147         if (top.evlist == NULL)
1148                 return -ENOMEM;
1149 
1150         argc = parse_options(argc, argv, options, top_usage, 0);
1151         if (argc)
1152                 usage_with_options(top_usage, options);
1153 
1154         if (sort_order == default_sort_order)
1155                 sort_order = "dso,symbol";
1156 
1157         if (setup_sorting() < 0) {
1158                 parse_options_usage(top_usage, options, "s", 1);
1159                 goto out_delete_evlist;
1160         }
1161 
1162         /* display thread wants entries to be collapsed in a different tree */
1163         sort__need_collapse = 1;
1164 
1165         if (top.use_stdio)
1166                 use_browser = 0;
1167         else if (top.use_tui)
1168                 use_browser = 1;
1169 
1170         setup_browser(false);
1171 
1172         status = target__validate(target);
1173         if (status) {
1174                 target__strerror(target, status, errbuf, BUFSIZ);
1175                 ui__warning("%s\n", errbuf);
1176         }
1177 
1178         status = target__parse_uid(target);
1179         if (status) {
1180                 int saved_errno = errno;
1181 
1182                 target__strerror(target, status, errbuf, BUFSIZ);
1183                 ui__error("%s\n", errbuf);
1184 
1185                 status = -saved_errno;
1186                 goto out_delete_evlist;
1187         }
1188 
1189         if (target__none(target))
1190                 target->system_wide = true;
1191 
1192         if (perf_evlist__create_maps(top.evlist, target) < 0)
1193                 usage_with_options(top_usage, options);
1194 
1195         if (!top.evlist->nr_entries &&
1196             perf_evlist__add_default(top.evlist) < 0) {
1197                 ui__error("Not enough memory for event selector list\n");
1198                 goto out_delete_maps;
1199         }
1200 
1201         symbol_conf.nr_events = top.evlist->nr_entries;
1202 
1203         if (top.delay_secs < 1)
1204                 top.delay_secs = 1;
1205 
1206         if (perf_record_opts__config(opts)) {
1207                 status = -EINVAL;
1208                 goto out_delete_maps;
1209         }
1210 
1211         top.sym_evsel = perf_evlist__first(top.evlist);
1212 
1213         symbol_conf.priv_size = sizeof(struct annotation);
1214 
1215         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1216         if (symbol__init() < 0)
1217                 return -1;
1218 
1219         sort__setup_elide(stdout);
1220 
1221         get_term_dimensions(&top.winsize);
1222         if (top.print_entries == 0) {
1223                 struct sigaction act = {
1224                         .sa_sigaction = perf_top__sig_winch,
1225                         .sa_flags     = SA_SIGINFO,
1226                 };
1227                 perf_top__update_print_entries(&top);
1228                 sigaction(SIGWINCH, &act, NULL);
1229         }
1230 
1231         status = __cmd_top(&top);
1232 
1233 out_delete_maps:
1234         perf_evlist__delete_maps(top.evlist);
1235 out_delete_evlist:
1236         perf_evlist__delete(top.evlist);
1237 
1238         return status;
1239 }
1240 

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