Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[~shefty/rdma-dev.git] / tools / perf / builtin-top.c
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/session.h"
30 #include "util/symbol.h"
31 #include "util/thread.h"
32 #include "util/thread_map.h"
33 #include "util/top.h"
34 #include "util/util.h"
35 #include <linux/rbtree.h>
36 #include "util/parse-options.h"
37 #include "util/parse-events.h"
38 #include "util/cpumap.h"
39 #include "util/xyarray.h"
40 #include "util/sort.h"
41
42 #include "util/debug.h"
43
44 #include <assert.h>
45 #include <fcntl.h>
46
47 #include <stdio.h>
48 #include <termios.h>
49 #include <unistd.h>
50 #include <inttypes.h>
51
52 #include <errno.h>
53 #include <time.h>
54 #include <sched.h>
55
56 #include <sys/syscall.h>
57 #include <sys/ioctl.h>
58 #include <sys/poll.h>
59 #include <sys/prctl.h>
60 #include <sys/wait.h>
61 #include <sys/uio.h>
62 #include <sys/mman.h>
63
64 #include <linux/unistd.h>
65 #include <linux/types.h>
66
67 static struct perf_top top = {
68         .count_filter           = 5,
69         .delay_secs             = 2,
70         .target_pid             = -1,
71         .target_tid             = -1,
72         .freq                   = 1000, /* 1 KHz */
73 };
74
75 static bool                     system_wide                     =  false;
76
77 static bool                     use_tui, use_stdio;
78
79 static bool                     sort_has_symbols;
80
81 static bool                     dont_use_callchains;
82 static char                     callchain_default_opt[]         = "fractal,0.5,callee";
83
84
85 static int                      default_interval                =      0;
86
87 static bool                     kptr_restrict_warned;
88 static bool                     vmlinux_warned;
89 static bool                     inherit                         =  false;
90 static int                      realtime_prio                   =      0;
91 static bool                     group                           =  false;
92 static unsigned int             mmap_pages                      =    128;
93
94 static bool                     dump_symtab                     =  false;
95
96 static struct winsize           winsize;
97
98 static const char               *sym_filter                     =   NULL;
99 static int                      sym_pcnt_filter                 =      5;
100
101 /*
102  * Source functions
103  */
104
105 void get_term_dimensions(struct winsize *ws)
106 {
107         char *s = getenv("LINES");
108
109         if (s != NULL) {
110                 ws->ws_row = atoi(s);
111                 s = getenv("COLUMNS");
112                 if (s != NULL) {
113                         ws->ws_col = atoi(s);
114                         if (ws->ws_row && ws->ws_col)
115                                 return;
116                 }
117         }
118 #ifdef TIOCGWINSZ
119         if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
120             ws->ws_row && ws->ws_col)
121                 return;
122 #endif
123         ws->ws_row = 25;
124         ws->ws_col = 80;
125 }
126
127 static void update_print_entries(struct winsize *ws)
128 {
129         top.print_entries = ws->ws_row;
130
131         if (top.print_entries > 9)
132                 top.print_entries -= 9;
133 }
134
135 static void sig_winch_handler(int sig __used)
136 {
137         get_term_dimensions(&winsize);
138         update_print_entries(&winsize);
139 }
140
141 static int parse_source(struct hist_entry *he)
142 {
143         struct symbol *sym;
144         struct annotation *notes;
145         struct map *map;
146         int err = -1;
147
148         if (!he || !he->ms.sym)
149                 return -1;
150
151         sym = he->ms.sym;
152         map = he->ms.map;
153
154         /*
155          * We can't annotate with just /proc/kallsyms
156          */
157         if (map->dso->symtab_type == SYMTAB__KALLSYMS) {
158                 pr_err("Can't annotate %s: No vmlinux file was found in the "
159                        "path\n", sym->name);
160                 sleep(1);
161                 return -1;
162         }
163
164         notes = symbol__annotation(sym);
165         if (notes->src != NULL) {
166                 pthread_mutex_lock(&notes->lock);
167                 goto out_assign;
168         }
169
170         pthread_mutex_lock(&notes->lock);
171
172         if (symbol__alloc_hist(sym, top.evlist->nr_entries) < 0) {
173                 pthread_mutex_unlock(&notes->lock);
174                 pr_err("Not enough memory for annotating '%s' symbol!\n",
175                        sym->name);
176                 sleep(1);
177                 return err;
178         }
179
180         err = symbol__annotate(sym, map, 0);
181         if (err == 0) {
182 out_assign:
183                 top.sym_filter_entry = he;
184         }
185
186         pthread_mutex_unlock(&notes->lock);
187         return err;
188 }
189
190 static void __zero_source_counters(struct hist_entry *he)
191 {
192         struct symbol *sym = he->ms.sym;
193         symbol__annotate_zero_histograms(sym);
194 }
195
196 static void record_precise_ip(struct hist_entry *he, int counter, u64 ip)
197 {
198         struct annotation *notes;
199         struct symbol *sym;
200
201         if (he == NULL || he->ms.sym == NULL ||
202             (he != top.sym_filter_entry && use_browser != 1))
203                 return;
204
205         sym = he->ms.sym;
206         notes = symbol__annotation(sym);
207
208         if (pthread_mutex_trylock(&notes->lock))
209                 return;
210
211         if (notes->src == NULL &&
212             symbol__alloc_hist(sym, top.evlist->nr_entries) < 0) {
213                 pthread_mutex_unlock(&notes->lock);
214                 pr_err("Not enough memory for annotating '%s' symbol!\n",
215                        sym->name);
216                 sleep(1);
217                 return;
218         }
219
220         ip = he->ms.map->map_ip(he->ms.map, ip);
221         symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
222
223         pthread_mutex_unlock(&notes->lock);
224 }
225
226 static void show_details(struct hist_entry *he)
227 {
228         struct annotation *notes;
229         struct symbol *symbol;
230         int more;
231
232         if (!he)
233                 return;
234
235         symbol = he->ms.sym;
236         notes = symbol__annotation(symbol);
237
238         pthread_mutex_lock(&notes->lock);
239
240         if (notes->src == NULL)
241                 goto out_unlock;
242
243         printf("Showing %s for %s\n", event_name(top.sym_evsel), symbol->name);
244         printf("  Events  Pcnt (>=%d%%)\n", sym_pcnt_filter);
245
246         more = symbol__annotate_printf(symbol, he->ms.map, top.sym_evsel->idx,
247                                        0, sym_pcnt_filter, top.print_entries, 4);
248         if (top.zero)
249                 symbol__annotate_zero_histogram(symbol, top.sym_evsel->idx);
250         else
251                 symbol__annotate_decay_histogram(symbol, top.sym_evsel->idx);
252         if (more != 0)
253                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
254 out_unlock:
255         pthread_mutex_unlock(&notes->lock);
256 }
257
258 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
259
260 static struct hist_entry *
261         perf_session__add_hist_entry(struct perf_session *session,
262                                      struct addr_location *al,
263                                      struct perf_sample *sample,
264                                      struct perf_evsel *evsel)
265 {
266         struct hist_entry *he;
267
268         he = __hists__add_entry(&evsel->hists, al, NULL, sample->period);
269         if (he == NULL)
270                 return NULL;
271
272         session->hists.stats.total_period += sample->period;
273         hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
274         return he;
275 }
276
277 static void print_sym_table(void)
278 {
279         char bf[160];
280         int printed = 0;
281         const int win_width = winsize.ws_col - 1;
282
283         puts(CONSOLE_CLEAR);
284
285         perf_top__header_snprintf(&top, bf, sizeof(bf));
286         printf("%s\n", bf);
287
288         perf_top__reset_sample_counters(&top);
289
290         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
291
292         if (top.total_lost_warned != top.session->hists.stats.total_lost) {
293                 top.total_lost_warned = top.session->hists.stats.total_lost;
294                 color_fprintf(stdout, PERF_COLOR_RED, "WARNING:");
295                 printf(" LOST %" PRIu64 " events, Check IO/CPU overload\n",
296                        top.total_lost_warned);
297                 ++printed;
298         }
299
300         if (top.sym_filter_entry) {
301                 show_details(top.sym_filter_entry);
302                 return;
303         }
304
305         hists__collapse_resort_threaded(&top.sym_evsel->hists);
306         hists__output_resort_threaded(&top.sym_evsel->hists);
307         hists__decay_entries_threaded(&top.sym_evsel->hists,
308                                       top.hide_user_symbols,
309                                       top.hide_kernel_symbols);
310         hists__output_recalc_col_len(&top.sym_evsel->hists, winsize.ws_row - 3);
311         putchar('\n');
312         hists__fprintf(&top.sym_evsel->hists, NULL, false, false,
313                        winsize.ws_row - 4 - printed, win_width, stdout);
314 }
315
316 static void prompt_integer(int *target, const char *msg)
317 {
318         char *buf = malloc(0), *p;
319         size_t dummy = 0;
320         int tmp;
321
322         fprintf(stdout, "\n%s: ", msg);
323         if (getline(&buf, &dummy, stdin) < 0)
324                 return;
325
326         p = strchr(buf, '\n');
327         if (p)
328                 *p = 0;
329
330         p = buf;
331         while(*p) {
332                 if (!isdigit(*p))
333                         goto out_free;
334                 p++;
335         }
336         tmp = strtoul(buf, NULL, 10);
337         *target = tmp;
338 out_free:
339         free(buf);
340 }
341
342 static void prompt_percent(int *target, const char *msg)
343 {
344         int tmp = 0;
345
346         prompt_integer(&tmp, msg);
347         if (tmp >= 0 && tmp <= 100)
348                 *target = tmp;
349 }
350
351 static void prompt_symbol(struct hist_entry **target, const char *msg)
352 {
353         char *buf = malloc(0), *p;
354         struct hist_entry *syme = *target, *n, *found = NULL;
355         struct rb_node *next;
356         size_t dummy = 0;
357
358         /* zero counters of active symbol */
359         if (syme) {
360                 __zero_source_counters(syme);
361                 *target = NULL;
362         }
363
364         fprintf(stdout, "\n%s: ", msg);
365         if (getline(&buf, &dummy, stdin) < 0)
366                 goto out_free;
367
368         p = strchr(buf, '\n');
369         if (p)
370                 *p = 0;
371
372         next = rb_first(&top.sym_evsel->hists.entries);
373         while (next) {
374                 n = rb_entry(next, struct hist_entry, rb_node);
375                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
376                         found = n;
377                         break;
378                 }
379                 next = rb_next(&n->rb_node);
380         }
381
382         if (!found) {
383                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
384                 sleep(1);
385                 return;
386         } else
387                 parse_source(found);
388
389 out_free:
390         free(buf);
391 }
392
393 static void print_mapped_keys(void)
394 {
395         char *name = NULL;
396
397         if (top.sym_filter_entry) {
398                 struct symbol *sym = top.sym_filter_entry->ms.sym;
399                 name = sym->name;
400         }
401
402         fprintf(stdout, "\nMapped keys:\n");
403         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top.delay_secs);
404         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top.print_entries);
405
406         if (top.evlist->nr_entries > 1)
407                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", event_name(top.sym_evsel));
408
409         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top.count_filter);
410
411         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
412         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
413         fprintf(stdout, "\t[S]     stop annotation.\n");
414
415         fprintf(stdout,
416                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
417                 top.hide_kernel_symbols ? "yes" : "no");
418         fprintf(stdout,
419                 "\t[U]     hide user symbols.               \t(%s)\n",
420                 top.hide_user_symbols ? "yes" : "no");
421         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top.zero ? 1 : 0);
422         fprintf(stdout, "\t[qQ]    quit.\n");
423 }
424
425 static int key_mapped(int c)
426 {
427         switch (c) {
428                 case 'd':
429                 case 'e':
430                 case 'f':
431                 case 'z':
432                 case 'q':
433                 case 'Q':
434                 case 'K':
435                 case 'U':
436                 case 'F':
437                 case 's':
438                 case 'S':
439                         return 1;
440                 case 'E':
441                         return top.evlist->nr_entries > 1 ? 1 : 0;
442                 default:
443                         break;
444         }
445
446         return 0;
447 }
448
449 static void handle_keypress(int c)
450 {
451         if (!key_mapped(c)) {
452                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
453                 struct termios tc, save;
454
455                 print_mapped_keys();
456                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
457                 fflush(stdout);
458
459                 tcgetattr(0, &save);
460                 tc = save;
461                 tc.c_lflag &= ~(ICANON | ECHO);
462                 tc.c_cc[VMIN] = 0;
463                 tc.c_cc[VTIME] = 0;
464                 tcsetattr(0, TCSANOW, &tc);
465
466                 poll(&stdin_poll, 1, -1);
467                 c = getc(stdin);
468
469                 tcsetattr(0, TCSAFLUSH, &save);
470                 if (!key_mapped(c))
471                         return;
472         }
473
474         switch (c) {
475                 case 'd':
476                         prompt_integer(&top.delay_secs, "Enter display delay");
477                         if (top.delay_secs < 1)
478                                 top.delay_secs = 1;
479                         break;
480                 case 'e':
481                         prompt_integer(&top.print_entries, "Enter display entries (lines)");
482                         if (top.print_entries == 0) {
483                                 sig_winch_handler(SIGWINCH);
484                                 signal(SIGWINCH, sig_winch_handler);
485                         } else
486                                 signal(SIGWINCH, SIG_DFL);
487                         break;
488                 case 'E':
489                         if (top.evlist->nr_entries > 1) {
490                                 /* Select 0 as the default event: */
491                                 int counter = 0;
492
493                                 fprintf(stderr, "\nAvailable events:");
494
495                                 list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
496                                         fprintf(stderr, "\n\t%d %s", top.sym_evsel->idx, event_name(top.sym_evsel));
497
498                                 prompt_integer(&counter, "Enter details event counter");
499
500                                 if (counter >= top.evlist->nr_entries) {
501                                         top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
502                                         fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(top.sym_evsel));
503                                         sleep(1);
504                                         break;
505                                 }
506                                 list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
507                                         if (top.sym_evsel->idx == counter)
508                                                 break;
509                         } else
510                                 top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
511                         break;
512                 case 'f':
513                         prompt_integer(&top.count_filter, "Enter display event count filter");
514                         break;
515                 case 'F':
516                         prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
517                         break;
518                 case 'K':
519                         top.hide_kernel_symbols = !top.hide_kernel_symbols;
520                         break;
521                 case 'q':
522                 case 'Q':
523                         printf("exiting.\n");
524                         if (dump_symtab)
525                                 perf_session__fprintf_dsos(top.session, stderr);
526                         exit(0);
527                 case 's':
528                         prompt_symbol(&top.sym_filter_entry, "Enter details symbol");
529                         break;
530                 case 'S':
531                         if (!top.sym_filter_entry)
532                                 break;
533                         else {
534                                 struct hist_entry *syme = top.sym_filter_entry;
535
536                                 top.sym_filter_entry = NULL;
537                                 __zero_source_counters(syme);
538                         }
539                         break;
540                 case 'U':
541                         top.hide_user_symbols = !top.hide_user_symbols;
542                         break;
543                 case 'z':
544                         top.zero = !top.zero;
545                         break;
546                 default:
547                         break;
548         }
549 }
550
551 static void perf_top__sort_new_samples(void *arg)
552 {
553         struct perf_top *t = arg;
554         perf_top__reset_sample_counters(t);
555
556         if (t->evlist->selected != NULL)
557                 t->sym_evsel = t->evlist->selected;
558
559         hists__collapse_resort_threaded(&t->sym_evsel->hists);
560         hists__output_resort_threaded(&t->sym_evsel->hists);
561         hists__decay_entries_threaded(&t->sym_evsel->hists,
562                                       top.hide_user_symbols,
563                                       top.hide_kernel_symbols);
564         hists__output_recalc_col_len(&t->sym_evsel->hists, winsize.ws_row - 3);
565 }
566
567 static void *display_thread_tui(void *arg __used)
568 {
569         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
570
571         perf_top__sort_new_samples(&top);
572         perf_evlist__tui_browse_hists(top.evlist, help,
573                                       perf_top__sort_new_samples,
574                                       &top, top.delay_secs);
575
576         exit_browser(0);
577         exit(0);
578         return NULL;
579 }
580
581 static void *display_thread(void *arg __used)
582 {
583         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
584         struct termios tc, save;
585         int delay_msecs, c;
586
587         tcgetattr(0, &save);
588         tc = save;
589         tc.c_lflag &= ~(ICANON | ECHO);
590         tc.c_cc[VMIN] = 0;
591         tc.c_cc[VTIME] = 0;
592
593         pthread__unblock_sigwinch();
594 repeat:
595         delay_msecs = top.delay_secs * 1000;
596         tcsetattr(0, TCSANOW, &tc);
597         /* trash return*/
598         getc(stdin);
599
600         while (1) {
601                 print_sym_table();
602                 /*
603                  * Either timeout expired or we got an EINTR due to SIGWINCH,
604                  * refresh screen in both cases.
605                  */
606                 switch (poll(&stdin_poll, 1, delay_msecs)) {
607                 case 0:
608                         continue;
609                 case -1:
610                         if (errno == EINTR)
611                                 continue;
612                         /* Fall trhu */
613                 default:
614                         goto process_hotkey;
615                 }
616         }
617 process_hotkey:
618         c = getc(stdin);
619         tcsetattr(0, TCSAFLUSH, &save);
620
621         handle_keypress(c);
622         goto repeat;
623
624         return NULL;
625 }
626
627 /* Tag samples to be skipped. */
628 static const char *skip_symbols[] = {
629         "default_idle",
630         "native_safe_halt",
631         "cpu_idle",
632         "enter_idle",
633         "exit_idle",
634         "mwait_idle",
635         "mwait_idle_with_hints",
636         "poll_idle",
637         "ppc64_runlatch_off",
638         "pseries_dedicated_idle_sleep",
639         NULL
640 };
641
642 static int symbol_filter(struct map *map __used, struct symbol *sym)
643 {
644         const char *name = sym->name;
645         int i;
646
647         /*
648          * ppc64 uses function descriptors and appends a '.' to the
649          * start of every instruction address. Remove it.
650          */
651         if (name[0] == '.')
652                 name++;
653
654         if (!strcmp(name, "_text") ||
655             !strcmp(name, "_etext") ||
656             !strcmp(name, "_sinittext") ||
657             !strncmp("init_module", name, 11) ||
658             !strncmp("cleanup_module", name, 14) ||
659             strstr(name, "_text_start") ||
660             strstr(name, "_text_end"))
661                 return 1;
662
663         for (i = 0; skip_symbols[i]; i++) {
664                 if (!strcmp(skip_symbols[i], name)) {
665                         sym->ignore = true;
666                         break;
667                 }
668         }
669
670         return 0;
671 }
672
673 static void perf_event__process_sample(const union perf_event *event,
674                                        struct perf_sample *sample,
675                                        struct perf_session *session)
676 {
677         struct symbol *parent = NULL;
678         u64 ip = event->ip.ip;
679         struct addr_location al;
680         struct machine *machine;
681         int err;
682         u8 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
683
684         ++top.samples;
685
686         switch (origin) {
687         case PERF_RECORD_MISC_USER:
688                 ++top.us_samples;
689                 if (top.hide_user_symbols)
690                         return;
691                 machine = perf_session__find_host_machine(session);
692                 break;
693         case PERF_RECORD_MISC_KERNEL:
694                 ++top.kernel_samples;
695                 if (top.hide_kernel_symbols)
696                         return;
697                 machine = perf_session__find_host_machine(session);
698                 break;
699         case PERF_RECORD_MISC_GUEST_KERNEL:
700                 ++top.guest_kernel_samples;
701                 machine = perf_session__find_machine(session, event->ip.pid);
702                 break;
703         case PERF_RECORD_MISC_GUEST_USER:
704                 ++top.guest_us_samples;
705                 /*
706                  * TODO: we don't process guest user from host side
707                  * except simple counting.
708                  */
709                 return;
710         default:
711                 return;
712         }
713
714         if (!machine && perf_guest) {
715                 pr_err("Can't find guest [%d]'s kernel information\n",
716                         event->ip.pid);
717                 return;
718         }
719
720         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
721                 top.exact_samples++;
722
723         if (perf_event__preprocess_sample(event, session, &al, sample,
724                                           symbol_filter) < 0 ||
725             al.filtered)
726                 return;
727
728         if (!kptr_restrict_warned &&
729             symbol_conf.kptr_restrict &&
730             al.cpumode == PERF_RECORD_MISC_KERNEL) {
731                 ui__warning(
732 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
733 "Check /proc/sys/kernel/kptr_restrict.\n\n"
734 "Kernel%s samples will not be resolved.\n",
735                           !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
736                           " modules" : "");
737                 if (use_browser <= 0)
738                         sleep(5);
739                 kptr_restrict_warned = true;
740         }
741
742         if (al.sym == NULL) {
743                 const char *msg = "Kernel samples will not be resolved.\n";
744                 /*
745                  * As we do lazy loading of symtabs we only will know if the
746                  * specified vmlinux file is invalid when we actually have a
747                  * hit in kernel space and then try to load it. So if we get
748                  * here and there are _no_ symbols in the DSO backing the
749                  * kernel map, bail out.
750                  *
751                  * We may never get here, for instance, if we use -K/
752                  * --hide-kernel-symbols, even if the user specifies an
753                  * invalid --vmlinux ;-)
754                  */
755                 if (!kptr_restrict_warned && !vmlinux_warned &&
756                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
757                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
758                         if (symbol_conf.vmlinux_name) {
759                                 ui__warning("The %s file can't be used.\n%s",
760                                             symbol_conf.vmlinux_name, msg);
761                         } else {
762                                 ui__warning("A vmlinux file was not found.\n%s",
763                                             msg);
764                         }
765
766                         if (use_browser <= 0)
767                                 sleep(5);
768                         vmlinux_warned = true;
769                 }
770         }
771
772         if (al.sym == NULL || !al.sym->ignore) {
773                 struct perf_evsel *evsel;
774                 struct hist_entry *he;
775
776                 evsel = perf_evlist__id2evsel(top.evlist, sample->id);
777                 assert(evsel != NULL);
778
779                 if ((sort__has_parent || symbol_conf.use_callchain) &&
780                     sample->callchain) {
781                         err = perf_session__resolve_callchain(session, al.thread,
782                                                               sample->callchain, &parent);
783                         if (err)
784                                 return;
785                 }
786
787                 he = perf_session__add_hist_entry(session, &al, sample, evsel);
788                 if (he == NULL) {
789                         pr_err("Problem incrementing symbol period, skipping event\n");
790                         return;
791                 }
792
793                 if (symbol_conf.use_callchain) {
794                         err = callchain_append(he->callchain, &session->callchain_cursor,
795                                                sample->period);
796                         if (err)
797                                 return;
798                 }
799
800                 if (sort_has_symbols)
801                         record_precise_ip(he, evsel->idx, ip);
802         }
803
804         return;
805 }
806
807 static void perf_session__mmap_read_idx(struct perf_session *self, int idx)
808 {
809         struct perf_sample sample;
810         union perf_event *event;
811         int ret;
812
813         while ((event = perf_evlist__mmap_read(top.evlist, idx)) != NULL) {
814                 ret = perf_session__parse_sample(self, event, &sample);
815                 if (ret) {
816                         pr_err("Can't parse sample, err = %d\n", ret);
817                         continue;
818                 }
819
820                 if (event->header.type == PERF_RECORD_SAMPLE)
821                         perf_event__process_sample(event, &sample, self);
822                 else
823                         perf_event__process(event, &sample, self);
824         }
825 }
826
827 static void perf_session__mmap_read(struct perf_session *self)
828 {
829         int i;
830
831         for (i = 0; i < top.evlist->nr_mmaps; i++)
832                 perf_session__mmap_read_idx(self, i);
833 }
834
835 static void start_counters(struct perf_evlist *evlist)
836 {
837         struct perf_evsel *counter;
838
839         list_for_each_entry(counter, &evlist->entries, node) {
840                 struct perf_event_attr *attr = &counter->attr;
841
842                 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
843
844                 if (top.freq) {
845                         attr->sample_type |= PERF_SAMPLE_PERIOD;
846                         attr->freq        = 1;
847                         attr->sample_freq = top.freq;
848                 }
849
850                 if (evlist->nr_entries > 1) {
851                         attr->sample_type |= PERF_SAMPLE_ID;
852                         attr->read_format |= PERF_FORMAT_ID;
853                 }
854
855                 if (symbol_conf.use_callchain)
856                         attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
857
858                 attr->mmap = 1;
859                 attr->comm = 1;
860                 attr->inherit = inherit;
861 try_again:
862                 if (perf_evsel__open(counter, top.evlist->cpus,
863                                      top.evlist->threads, group) < 0) {
864                         int err = errno;
865
866                         if (err == EPERM || err == EACCES) {
867                                 ui__warning_paranoid();
868                                 goto out_err;
869                         }
870                         /*
871                          * If it's cycles then fall back to hrtimer
872                          * based cpu-clock-tick sw counter, which
873                          * is always available even if no PMU support:
874                          */
875                         if (attr->type == PERF_TYPE_HARDWARE &&
876                             attr->config == PERF_COUNT_HW_CPU_CYCLES) {
877                                 if (verbose)
878                                         ui__warning("Cycles event not supported,\n"
879                                                     "trying to fall back to cpu-clock-ticks\n");
880
881                                 attr->type = PERF_TYPE_SOFTWARE;
882                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
883                                 goto try_again;
884                         }
885
886                         if (err == ENOENT) {
887                                 ui__warning("The %s event is not supported.\n",
888                                             event_name(counter));
889                                 goto out_err;
890                         }
891
892                         ui__warning("The sys_perf_event_open() syscall "
893                                     "returned with %d (%s).  /bin/dmesg "
894                                     "may provide additional information.\n"
895                                     "No CONFIG_PERF_EVENTS=y kernel support "
896                                     "configured?\n", err, strerror(err));
897                         goto out_err;
898                 }
899         }
900
901         if (perf_evlist__mmap(evlist, mmap_pages, false) < 0) {
902                 ui__warning("Failed to mmap with %d (%s)\n",
903                             errno, strerror(errno));
904                 goto out_err;
905         }
906
907         return;
908
909 out_err:
910         exit_browser(0);
911         exit(0);
912 }
913
914 static int setup_sample_type(void)
915 {
916         if (!sort_has_symbols) {
917                 if (symbol_conf.use_callchain) {
918                         ui__warning("Selected -g but \"sym\" not present in --sort/-s.");
919                         return -EINVAL;
920                 }
921         } else if (!dont_use_callchains && callchain_param.mode != CHAIN_NONE) {
922                 if (callchain_register_param(&callchain_param) < 0) {
923                         ui__warning("Can't register callchain params.\n");
924                         return -EINVAL;
925                 }
926         }
927
928         return 0;
929 }
930
931 static int __cmd_top(void)
932 {
933         pthread_t thread;
934         int ret;
935         /*
936          * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
937          * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
938          */
939         top.session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
940         if (top.session == NULL)
941                 return -ENOMEM;
942
943         ret = setup_sample_type();
944         if (ret)
945                 goto out_delete;
946
947         if (top.target_tid != -1)
948                 perf_event__synthesize_thread_map(top.evlist->threads,
949                                                   perf_event__process, top.session);
950         else
951                 perf_event__synthesize_threads(perf_event__process, top.session);
952
953         start_counters(top.evlist);
954         top.session->evlist = top.evlist;
955         perf_session__update_sample_type(top.session);
956
957         /* Wait for a minimal set of events before starting the snapshot */
958         poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
959
960         perf_session__mmap_read(top.session);
961
962         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
963                                                              display_thread), NULL)) {
964                 printf("Could not create display thread.\n");
965                 exit(-1);
966         }
967
968         if (realtime_prio) {
969                 struct sched_param param;
970
971                 param.sched_priority = realtime_prio;
972                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
973                         printf("Could not set realtime priority.\n");
974                         exit(-1);
975                 }
976         }
977
978         while (1) {
979                 u64 hits = top.samples;
980
981                 perf_session__mmap_read(top.session);
982
983                 if (hits == top.samples)
984                         ret = poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
985         }
986
987 out_delete:
988         perf_session__delete(top.session);
989         top.session = NULL;
990
991         return 0;
992 }
993
994 static int
995 parse_callchain_opt(const struct option *opt __used, const char *arg,
996                     int unset)
997 {
998         char *tok, *tok2;
999         char *endptr;
1000
1001         /*
1002          * --no-call-graph
1003          */
1004         if (unset) {
1005                 dont_use_callchains = true;
1006                 return 0;
1007         }
1008
1009         symbol_conf.use_callchain = true;
1010
1011         if (!arg)
1012                 return 0;
1013
1014         tok = strtok((char *)arg, ",");
1015         if (!tok)
1016                 return -1;
1017
1018         /* get the output mode */
1019         if (!strncmp(tok, "graph", strlen(arg)))
1020                 callchain_param.mode = CHAIN_GRAPH_ABS;
1021
1022         else if (!strncmp(tok, "flat", strlen(arg)))
1023                 callchain_param.mode = CHAIN_FLAT;
1024
1025         else if (!strncmp(tok, "fractal", strlen(arg)))
1026                 callchain_param.mode = CHAIN_GRAPH_REL;
1027
1028         else if (!strncmp(tok, "none", strlen(arg))) {
1029                 callchain_param.mode = CHAIN_NONE;
1030                 symbol_conf.use_callchain = false;
1031
1032                 return 0;
1033         }
1034
1035         else
1036                 return -1;
1037
1038         /* get the min percentage */
1039         tok = strtok(NULL, ",");
1040         if (!tok)
1041                 goto setup;
1042
1043         callchain_param.min_percent = strtod(tok, &endptr);
1044         if (tok == endptr)
1045                 return -1;
1046
1047         /* get the print limit */
1048         tok2 = strtok(NULL, ",");
1049         if (!tok2)
1050                 goto setup;
1051
1052         if (tok2[0] != 'c') {
1053                 callchain_param.print_limit = strtod(tok2, &endptr);
1054                 tok2 = strtok(NULL, ",");
1055                 if (!tok2)
1056                         goto setup;
1057         }
1058
1059         /* get the call chain order */
1060         if (!strcmp(tok2, "caller"))
1061                 callchain_param.order = ORDER_CALLER;
1062         else if (!strcmp(tok2, "callee"))
1063                 callchain_param.order = ORDER_CALLEE;
1064         else
1065                 return -1;
1066 setup:
1067         if (callchain_register_param(&callchain_param) < 0) {
1068                 fprintf(stderr, "Can't register callchain params\n");
1069                 return -1;
1070         }
1071         return 0;
1072 }
1073
1074 static const char * const top_usage[] = {
1075         "perf top [<options>]",
1076         NULL
1077 };
1078
1079 static const struct option options[] = {
1080         OPT_CALLBACK('e', "event", &top.evlist, "event",
1081                      "event selector. use 'perf list' to list available events",
1082                      parse_events_option),
1083         OPT_INTEGER('c', "count", &default_interval,
1084                     "event period to sample"),
1085         OPT_INTEGER('p', "pid", &top.target_pid,
1086                     "profile events on existing process id"),
1087         OPT_INTEGER('t', "tid", &top.target_tid,
1088                     "profile events on existing thread id"),
1089         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1090                             "system-wide collection from all CPUs"),
1091         OPT_STRING('C', "cpu", &top.cpu_list, "cpu",
1092                     "list of cpus to monitor"),
1093         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1094                    "file", "vmlinux pathname"),
1095         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1096                     "hide kernel symbols"),
1097         OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
1098         OPT_INTEGER('r', "realtime", &realtime_prio,
1099                     "collect data with this RT SCHED_FIFO priority"),
1100         OPT_INTEGER('d', "delay", &top.delay_secs,
1101                     "number of seconds to delay between refreshes"),
1102         OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1103                             "dump the symbol table used for profiling"),
1104         OPT_INTEGER('f', "count-filter", &top.count_filter,
1105                     "only display functions with more events than this"),
1106         OPT_BOOLEAN('g', "group", &group,
1107                             "put the counters into a counter group"),
1108         OPT_BOOLEAN('i', "inherit", &inherit,
1109                     "child tasks inherit counters"),
1110         OPT_STRING(0, "sym-annotate", &sym_filter, "symbol name",
1111                     "symbol to annotate"),
1112         OPT_BOOLEAN('z', "zero", &top.zero,
1113                     "zero history across updates"),
1114         OPT_INTEGER('F', "freq", &top.freq,
1115                     "profile at this frequency"),
1116         OPT_INTEGER('E', "entries", &top.print_entries,
1117                     "display this many functions"),
1118         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1119                     "hide user symbols"),
1120         OPT_BOOLEAN(0, "tui", &use_tui, "Use the TUI interface"),
1121         OPT_BOOLEAN(0, "stdio", &use_stdio, "Use the stdio interface"),
1122         OPT_INCR('v', "verbose", &verbose,
1123                     "be more verbose (show counter open errors, etc)"),
1124         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1125                    "sort by key(s): pid, comm, dso, symbol, parent"),
1126         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1127                     "Show a column with the number of samples"),
1128         OPT_CALLBACK_DEFAULT('G', "call-graph", NULL, "output_type,min_percent, call_order",
1129                      "Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. "
1130                      "Default: fractal,0.5,callee", &parse_callchain_opt,
1131                      callchain_default_opt),
1132         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1133                     "Show a column with the sum of periods"),
1134         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1135                    "only consider symbols in these dsos"),
1136         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1137                    "only consider symbols in these comms"),
1138         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1139                    "only consider these symbols"),
1140         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1141                     "Interleave source code with assembly code (default)"),
1142         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1143                     "Display raw encoding of assembly instructions (default)"),
1144         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1145                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1146         OPT_END()
1147 };
1148
1149 int cmd_top(int argc, const char **argv, const char *prefix __used)
1150 {
1151         struct perf_evsel *pos;
1152         int status = -ENOMEM;
1153
1154         top.evlist = perf_evlist__new(NULL, NULL);
1155         if (top.evlist == NULL)
1156                 return -ENOMEM;
1157
1158         symbol_conf.exclude_other = false;
1159
1160         argc = parse_options(argc, argv, options, top_usage, 0);
1161         if (argc)
1162                 usage_with_options(top_usage, options);
1163
1164         if (sort_order == default_sort_order)
1165                 sort_order = "dso,symbol";
1166
1167         setup_sorting(top_usage, options);
1168
1169         if (use_stdio)
1170                 use_browser = 0;
1171         else if (use_tui)
1172                 use_browser = 1;
1173
1174         setup_browser(false);
1175
1176         /* CPU and PID are mutually exclusive */
1177         if (top.target_tid > 0 && top.cpu_list) {
1178                 printf("WARNING: PID switch overriding CPU\n");
1179                 sleep(1);
1180                 top.cpu_list = NULL;
1181         }
1182
1183         if (top.target_pid != -1)
1184                 top.target_tid = top.target_pid;
1185
1186         if (perf_evlist__create_maps(top.evlist, top.target_pid,
1187                                      top.target_tid, top.cpu_list) < 0)
1188                 usage_with_options(top_usage, options);
1189
1190         if (!top.evlist->nr_entries &&
1191             perf_evlist__add_default(top.evlist) < 0) {
1192                 pr_err("Not enough memory for event selector list\n");
1193                 return -ENOMEM;
1194         }
1195
1196         if (top.delay_secs < 1)
1197                 top.delay_secs = 1;
1198
1199         /*
1200          * User specified count overrides default frequency.
1201          */
1202         if (default_interval)
1203                 top.freq = 0;
1204         else if (top.freq) {
1205                 default_interval = top.freq;
1206         } else {
1207                 fprintf(stderr, "frequency and count are zero, aborting\n");
1208                 exit(EXIT_FAILURE);
1209         }
1210
1211         list_for_each_entry(pos, &top.evlist->entries, node) {
1212                 if (perf_evsel__alloc_fd(pos, top.evlist->cpus->nr,
1213                                          top.evlist->threads->nr) < 0)
1214                         goto out_free_fd;
1215                 /*
1216                  * Fill in the ones not specifically initialized via -c:
1217                  */
1218                 if (pos->attr.sample_period)
1219                         continue;
1220
1221                 pos->attr.sample_period = default_interval;
1222         }
1223
1224         if (perf_evlist__alloc_pollfd(top.evlist) < 0 ||
1225             perf_evlist__alloc_mmap(top.evlist) < 0)
1226                 goto out_free_fd;
1227
1228         top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
1229
1230         symbol_conf.priv_size = sizeof(struct annotation);
1231
1232         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1233         if (symbol__init() < 0)
1234                 return -1;
1235
1236         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
1237         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
1238         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
1239
1240         /*
1241          * Avoid annotation data structures overhead when symbols aren't on the
1242          * sort list.
1243          */
1244         sort_has_symbols = sort_sym.list.next != NULL;
1245
1246         get_term_dimensions(&winsize);
1247         if (top.print_entries == 0) {
1248                 update_print_entries(&winsize);
1249                 signal(SIGWINCH, sig_winch_handler);
1250         }
1251
1252         status = __cmd_top();
1253 out_free_fd:
1254         perf_evlist__delete(top.evlist);
1255
1256         return status;
1257 }