perf symbols: Rename dso->origin to dso->symtab_type
[linux-2.6.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  *
9  * Improvements and fixes by:
10  *
11  *   Arjan van de Ven <arjan@linux.intel.com>
12  *   Yanmin Zhang <yanmin.zhang@intel.com>
13  *   Wu Fengguang <fengguang.wu@intel.com>
14  *   Mike Galbraith <efault@gmx.de>
15  *   Paul Mackerras <paulus@samba.org>
16  *
17  * Released under the GPL v2. (and only v2, not any later version)
18  */
19 #include "builtin.h"
20
21 #include "perf.h"
22
23 #include "util/annotate.h"
24 #include "util/cache.h"
25 #include "util/color.h"
26 #include "util/evlist.h"
27 #include "util/evsel.h"
28 #include "util/session.h"
29 #include "util/symbol.h"
30 #include "util/thread.h"
31 #include "util/thread_map.h"
32 #include "util/top.h"
33 #include "util/util.h"
34 #include <linux/rbtree.h>
35 #include "util/parse-options.h"
36 #include "util/parse-events.h"
37 #include "util/cpumap.h"
38 #include "util/xyarray.h"
39
40 #include "util/debug.h"
41
42 #include <assert.h>
43 #include <fcntl.h>
44
45 #include <stdio.h>
46 #include <termios.h>
47 #include <unistd.h>
48 #include <inttypes.h>
49
50 #include <errno.h>
51 #include <time.h>
52 #include <sched.h>
53
54 #include <sys/syscall.h>
55 #include <sys/ioctl.h>
56 #include <sys/poll.h>
57 #include <sys/prctl.h>
58 #include <sys/wait.h>
59 #include <sys/uio.h>
60 #include <sys/mman.h>
61
62 #include <linux/unistd.h>
63 #include <linux/types.h>
64
65 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
66
67 static struct perf_top top = {
68         .count_filter           = 5,
69         .delay_secs             = 2,
70         .display_weighted       = -1,
71         .target_pid             = -1,
72         .target_tid             = -1,
73         .active_symbols         = LIST_HEAD_INIT(top.active_symbols),
74         .active_symbols_lock    = PTHREAD_MUTEX_INITIALIZER,
75         .active_symbols_cond    = PTHREAD_COND_INITIALIZER,
76         .freq                   = 1000, /* 1 KHz */
77 };
78
79 static bool                     system_wide                     =  false;
80
81 static bool                     use_tui, use_stdio;
82
83 static int                      default_interval                =      0;
84
85 static bool                     inherit                         =  false;
86 static int                      realtime_prio                   =      0;
87 static bool                     group                           =  false;
88 static unsigned int             page_size;
89 static unsigned int             mmap_pages                      =    128;
90
91 static bool                     dump_symtab                     =  false;
92
93 static struct winsize           winsize;
94
95 static const char               *sym_filter                     =   NULL;
96 struct sym_entry                *sym_filter_entry_sched         =   NULL;
97 static int                      sym_pcnt_filter                 =      5;
98
99 /*
100  * Source functions
101  */
102
103 void get_term_dimensions(struct winsize *ws)
104 {
105         char *s = getenv("LINES");
106
107         if (s != NULL) {
108                 ws->ws_row = atoi(s);
109                 s = getenv("COLUMNS");
110                 if (s != NULL) {
111                         ws->ws_col = atoi(s);
112                         if (ws->ws_row && ws->ws_col)
113                                 return;
114                 }
115         }
116 #ifdef TIOCGWINSZ
117         if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
118             ws->ws_row && ws->ws_col)
119                 return;
120 #endif
121         ws->ws_row = 25;
122         ws->ws_col = 80;
123 }
124
125 static void update_print_entries(struct winsize *ws)
126 {
127         top.print_entries = ws->ws_row;
128
129         if (top.print_entries > 9)
130                 top.print_entries -= 9;
131 }
132
133 static void sig_winch_handler(int sig __used)
134 {
135         get_term_dimensions(&winsize);
136         update_print_entries(&winsize);
137 }
138
139 static int parse_source(struct sym_entry *syme)
140 {
141         struct symbol *sym;
142         struct annotation *notes;
143         struct map *map;
144         int err = -1;
145
146         if (!syme)
147                 return -1;
148
149         sym = sym_entry__symbol(syme);
150         map = syme->map;
151
152         /*
153          * We can't annotate with just /proc/kallsyms
154          */
155         if (map->dso->symtab_type == SYMTAB__KALLSYMS) {
156                 pr_err("Can't annotate %s: No vmlinux file was found in the "
157                        "path\n", sym->name);
158                 sleep(1);
159                 return -1;
160         }
161
162         notes = symbol__annotation(sym);
163         if (notes->src != NULL) {
164                 pthread_mutex_lock(&notes->lock);
165                 goto out_assign;
166         }
167
168         pthread_mutex_lock(&notes->lock);
169
170         if (symbol__alloc_hist(sym, top.evlist->nr_entries) < 0) {
171                 pthread_mutex_unlock(&notes->lock);
172                 pr_err("Not enough memory for annotating '%s' symbol!\n",
173                        sym->name);
174                 sleep(1);
175                 return err;
176         }
177
178         err = symbol__annotate(sym, syme->map, 0);
179         if (err == 0) {
180 out_assign:
181                 top.sym_filter_entry = syme;
182         }
183
184         pthread_mutex_unlock(&notes->lock);
185         return err;
186 }
187
188 static void __zero_source_counters(struct sym_entry *syme)
189 {
190         struct symbol *sym = sym_entry__symbol(syme);
191         symbol__annotate_zero_histograms(sym);
192 }
193
194 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
195 {
196         struct annotation *notes;
197         struct symbol *sym;
198
199         if (syme != top.sym_filter_entry)
200                 return;
201
202         sym = sym_entry__symbol(syme);
203         notes = symbol__annotation(sym);
204
205         if (pthread_mutex_trylock(&notes->lock))
206                 return;
207
208         ip = syme->map->map_ip(syme->map, ip);
209         symbol__inc_addr_samples(sym, syme->map, counter, ip);
210
211         pthread_mutex_unlock(&notes->lock);
212 }
213
214 static void show_details(struct sym_entry *syme)
215 {
216         struct annotation *notes;
217         struct symbol *symbol;
218         int more;
219
220         if (!syme)
221                 return;
222
223         symbol = sym_entry__symbol(syme);
224         notes = symbol__annotation(symbol);
225
226         pthread_mutex_lock(&notes->lock);
227
228         if (notes->src == NULL)
229                 goto out_unlock;
230
231         printf("Showing %s for %s\n", event_name(top.sym_evsel), symbol->name);
232         printf("  Events  Pcnt (>=%d%%)\n", sym_pcnt_filter);
233
234         more = symbol__annotate_printf(symbol, syme->map, top.sym_evsel->idx,
235                                        0, sym_pcnt_filter, top.print_entries, 4);
236         if (top.zero)
237                 symbol__annotate_zero_histogram(symbol, top.sym_evsel->idx);
238         else
239                 symbol__annotate_decay_histogram(symbol, top.sym_evsel->idx);
240         if (more != 0)
241                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
242 out_unlock:
243         pthread_mutex_unlock(&notes->lock);
244 }
245
246 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
247
248 static void __list_insert_active_sym(struct sym_entry *syme)
249 {
250         list_add(&syme->node, &top.active_symbols);
251 }
252
253 static void print_sym_table(struct perf_session *session)
254 {
255         char bf[160];
256         int printed = 0;
257         struct rb_node *nd;
258         struct sym_entry *syme;
259         struct rb_root tmp = RB_ROOT;
260         const int win_width = winsize.ws_col - 1;
261         int sym_width, dso_width, dso_short_width;
262         float sum_ksamples = perf_top__decay_samples(&top, &tmp);
263
264         puts(CONSOLE_CLEAR);
265
266         perf_top__header_snprintf(&top, bf, sizeof(bf));
267         printf("%s\n", bf);
268
269         perf_top__reset_sample_counters(&top);
270
271         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
272
273         if (session->hists.stats.total_lost != 0) {
274                 color_fprintf(stdout, PERF_COLOR_RED, "WARNING:");
275                 printf(" LOST %" PRIu64 " events, Check IO/CPU overload\n",
276                        session->hists.stats.total_lost);
277         }
278
279         if (top.sym_filter_entry) {
280                 show_details(top.sym_filter_entry);
281                 return;
282         }
283
284         perf_top__find_widths(&top, &tmp, &dso_width, &dso_short_width,
285                               &sym_width);
286
287         if (sym_width + dso_width > winsize.ws_col - 29) {
288                 dso_width = dso_short_width;
289                 if (sym_width + dso_width > winsize.ws_col - 29)
290                         sym_width = winsize.ws_col - dso_width - 29;
291         }
292         putchar('\n');
293         if (top.evlist->nr_entries == 1)
294                 printf("             samples  pcnt");
295         else
296                 printf("   weight    samples  pcnt");
297
298         if (verbose)
299                 printf("         RIP       ");
300         printf(" %-*.*s DSO\n", sym_width, sym_width, "function");
301         printf("   %s    _______ _____",
302                top.evlist->nr_entries == 1 ? "      " : "______");
303         if (verbose)
304                 printf(" ________________");
305         printf(" %-*.*s", sym_width, sym_width, graph_line);
306         printf(" %-*.*s", dso_width, dso_width, graph_line);
307         puts("\n");
308
309         for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
310                 struct symbol *sym;
311                 double pcnt;
312
313                 syme = rb_entry(nd, struct sym_entry, rb_node);
314                 sym = sym_entry__symbol(syme);
315                 if (++printed > top.print_entries ||
316                     (int)syme->snap_count < top.count_filter)
317                         continue;
318
319                 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
320                                          sum_ksamples));
321
322                 if (top.evlist->nr_entries == 1 || !top.display_weighted)
323                         printf("%20.2f ", syme->weight);
324                 else
325                         printf("%9.1f %10ld ", syme->weight, syme->snap_count);
326
327                 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
328                 if (verbose)
329                         printf(" %016" PRIx64, sym->start);
330                 printf(" %-*.*s", sym_width, sym_width, sym->name);
331                 printf(" %-*.*s\n", dso_width, dso_width,
332                        dso_width >= syme->map->dso->long_name_len ?
333                                         syme->map->dso->long_name :
334                                         syme->map->dso->short_name);
335         }
336 }
337
338 static void prompt_integer(int *target, const char *msg)
339 {
340         char *buf = malloc(0), *p;
341         size_t dummy = 0;
342         int tmp;
343
344         fprintf(stdout, "\n%s: ", msg);
345         if (getline(&buf, &dummy, stdin) < 0)
346                 return;
347
348         p = strchr(buf, '\n');
349         if (p)
350                 *p = 0;
351
352         p = buf;
353         while(*p) {
354                 if (!isdigit(*p))
355                         goto out_free;
356                 p++;
357         }
358         tmp = strtoul(buf, NULL, 10);
359         *target = tmp;
360 out_free:
361         free(buf);
362 }
363
364 static void prompt_percent(int *target, const char *msg)
365 {
366         int tmp = 0;
367
368         prompt_integer(&tmp, msg);
369         if (tmp >= 0 && tmp <= 100)
370                 *target = tmp;
371 }
372
373 static void prompt_symbol(struct sym_entry **target, const char *msg)
374 {
375         char *buf = malloc(0), *p;
376         struct sym_entry *syme = *target, *n, *found = NULL;
377         size_t dummy = 0;
378
379         /* zero counters of active symbol */
380         if (syme) {
381                 __zero_source_counters(syme);
382                 *target = NULL;
383         }
384
385         fprintf(stdout, "\n%s: ", msg);
386         if (getline(&buf, &dummy, stdin) < 0)
387                 goto out_free;
388
389         p = strchr(buf, '\n');
390         if (p)
391                 *p = 0;
392
393         pthread_mutex_lock(&top.active_symbols_lock);
394         syme = list_entry(top.active_symbols.next, struct sym_entry, node);
395         pthread_mutex_unlock(&top.active_symbols_lock);
396
397         list_for_each_entry_safe_from(syme, n, &top.active_symbols, node) {
398                 struct symbol *sym = sym_entry__symbol(syme);
399
400                 if (!strcmp(buf, sym->name)) {
401                         found = syme;
402                         break;
403                 }
404         }
405
406         if (!found) {
407                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
408                 sleep(1);
409                 return;
410         } else
411                 parse_source(found);
412
413 out_free:
414         free(buf);
415 }
416
417 static void print_mapped_keys(void)
418 {
419         char *name = NULL;
420
421         if (top.sym_filter_entry) {
422                 struct symbol *sym = sym_entry__symbol(top.sym_filter_entry);
423                 name = sym->name;
424         }
425
426         fprintf(stdout, "\nMapped keys:\n");
427         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top.delay_secs);
428         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top.print_entries);
429
430         if (top.evlist->nr_entries > 1)
431                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", event_name(top.sym_evsel));
432
433         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top.count_filter);
434
435         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
436         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
437         fprintf(stdout, "\t[S]     stop annotation.\n");
438
439         if (top.evlist->nr_entries > 1)
440                 fprintf(stdout, "\t[w]     toggle display weighted/count[E]r. \t(%d)\n", top.display_weighted ? 1 : 0);
441
442         fprintf(stdout,
443                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
444                 top.hide_kernel_symbols ? "yes" : "no");
445         fprintf(stdout,
446                 "\t[U]     hide user symbols.               \t(%s)\n",
447                 top.hide_user_symbols ? "yes" : "no");
448         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top.zero ? 1 : 0);
449         fprintf(stdout, "\t[qQ]    quit.\n");
450 }
451
452 static int key_mapped(int c)
453 {
454         switch (c) {
455                 case 'd':
456                 case 'e':
457                 case 'f':
458                 case 'z':
459                 case 'q':
460                 case 'Q':
461                 case 'K':
462                 case 'U':
463                 case 'F':
464                 case 's':
465                 case 'S':
466                         return 1;
467                 case 'E':
468                 case 'w':
469                         return top.evlist->nr_entries > 1 ? 1 : 0;
470                 default:
471                         break;
472         }
473
474         return 0;
475 }
476
477 static void handle_keypress(struct perf_session *session, int c)
478 {
479         if (!key_mapped(c)) {
480                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
481                 struct termios tc, save;
482
483                 print_mapped_keys();
484                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
485                 fflush(stdout);
486
487                 tcgetattr(0, &save);
488                 tc = save;
489                 tc.c_lflag &= ~(ICANON | ECHO);
490                 tc.c_cc[VMIN] = 0;
491                 tc.c_cc[VTIME] = 0;
492                 tcsetattr(0, TCSANOW, &tc);
493
494                 poll(&stdin_poll, 1, -1);
495                 c = getc(stdin);
496
497                 tcsetattr(0, TCSAFLUSH, &save);
498                 if (!key_mapped(c))
499                         return;
500         }
501
502         switch (c) {
503                 case 'd':
504                         prompt_integer(&top.delay_secs, "Enter display delay");
505                         if (top.delay_secs < 1)
506                                 top.delay_secs = 1;
507                         break;
508                 case 'e':
509                         prompt_integer(&top.print_entries, "Enter display entries (lines)");
510                         if (top.print_entries == 0) {
511                                 sig_winch_handler(SIGWINCH);
512                                 signal(SIGWINCH, sig_winch_handler);
513                         } else
514                                 signal(SIGWINCH, SIG_DFL);
515                         break;
516                 case 'E':
517                         if (top.evlist->nr_entries > 1) {
518                                 int counter;
519                                 fprintf(stderr, "\nAvailable events:");
520
521                                 list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
522                                         fprintf(stderr, "\n\t%d %s", top.sym_evsel->idx, event_name(top.sym_evsel));
523
524                                 prompt_integer(&counter, "Enter details event counter");
525
526                                 if (counter >= top.evlist->nr_entries) {
527                                         top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
528                                         fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(top.sym_evsel));
529                                         sleep(1);
530                                         break;
531                                 }
532                                 list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
533                                         if (top.sym_evsel->idx == counter)
534                                                 break;
535                         } else
536                                 top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
537                         break;
538                 case 'f':
539                         prompt_integer(&top.count_filter, "Enter display event count filter");
540                         break;
541                 case 'F':
542                         prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
543                         break;
544                 case 'K':
545                         top.hide_kernel_symbols = !top.hide_kernel_symbols;
546                         break;
547                 case 'q':
548                 case 'Q':
549                         printf("exiting.\n");
550                         if (dump_symtab)
551                                 perf_session__fprintf_dsos(session, stderr);
552                         exit(0);
553                 case 's':
554                         prompt_symbol(&top.sym_filter_entry, "Enter details symbol");
555                         break;
556                 case 'S':
557                         if (!top.sym_filter_entry)
558                                 break;
559                         else {
560                                 struct sym_entry *syme = top.sym_filter_entry;
561
562                                 top.sym_filter_entry = NULL;
563                                 __zero_source_counters(syme);
564                         }
565                         break;
566                 case 'U':
567                         top.hide_user_symbols = !top.hide_user_symbols;
568                         break;
569                 case 'w':
570                         top.display_weighted = ~top.display_weighted;
571                         break;
572                 case 'z':
573                         top.zero = !top.zero;
574                         break;
575                 default:
576                         break;
577         }
578 }
579
580 static void *display_thread_tui(void *arg __used)
581 {
582         int err = 0;
583         pthread_mutex_lock(&top.active_symbols_lock);
584         while (list_empty(&top.active_symbols)) {
585                 err = pthread_cond_wait(&top.active_symbols_cond,
586                                         &top.active_symbols_lock);
587                 if (err)
588                         break;
589         }
590         pthread_mutex_unlock(&top.active_symbols_lock);
591         if (!err)
592                 perf_top__tui_browser(&top);
593         exit_browser(0);
594         exit(0);
595         return NULL;
596 }
597
598 static void *display_thread(void *arg __used)
599 {
600         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
601         struct termios tc, save;
602         int delay_msecs, c;
603         struct perf_session *session = (struct perf_session *) arg;
604
605         tcgetattr(0, &save);
606         tc = save;
607         tc.c_lflag &= ~(ICANON | ECHO);
608         tc.c_cc[VMIN] = 0;
609         tc.c_cc[VTIME] = 0;
610
611 repeat:
612         delay_msecs = top.delay_secs * 1000;
613         tcsetattr(0, TCSANOW, &tc);
614         /* trash return*/
615         getc(stdin);
616
617         do {
618                 print_sym_table(session);
619         } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
620
621         c = getc(stdin);
622         tcsetattr(0, TCSAFLUSH, &save);
623
624         handle_keypress(session, c);
625         goto repeat;
626
627         return NULL;
628 }
629
630 /* Tag samples to be skipped. */
631 static const char *skip_symbols[] = {
632         "default_idle",
633         "native_safe_halt",
634         "cpu_idle",
635         "enter_idle",
636         "exit_idle",
637         "mwait_idle",
638         "mwait_idle_with_hints",
639         "poll_idle",
640         "ppc64_runlatch_off",
641         "pseries_dedicated_idle_sleep",
642         NULL
643 };
644
645 static int symbol_filter(struct map *map, struct symbol *sym)
646 {
647         struct sym_entry *syme;
648         const char *name = sym->name;
649         int i;
650
651         /*
652          * ppc64 uses function descriptors and appends a '.' to the
653          * start of every instruction address. Remove it.
654          */
655         if (name[0] == '.')
656                 name++;
657
658         if (!strcmp(name, "_text") ||
659             !strcmp(name, "_etext") ||
660             !strcmp(name, "_sinittext") ||
661             !strncmp("init_module", name, 11) ||
662             !strncmp("cleanup_module", name, 14) ||
663             strstr(name, "_text_start") ||
664             strstr(name, "_text_end"))
665                 return 1;
666
667         syme = symbol__priv(sym);
668         syme->map = map;
669         symbol__annotate_init(map, sym);
670
671         if (!top.sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
672                 /* schedule initial sym_filter_entry setup */
673                 sym_filter_entry_sched = syme;
674                 sym_filter = NULL;
675         }
676
677         for (i = 0; skip_symbols[i]; i++) {
678                 if (!strcmp(skip_symbols[i], name)) {
679                         syme->skip = 1;
680                         break;
681                 }
682         }
683
684         return 0;
685 }
686
687 static void perf_event__process_sample(const union perf_event *event,
688                                        struct perf_sample *sample,
689                                        struct perf_session *session)
690 {
691         u64 ip = event->ip.ip;
692         struct sym_entry *syme;
693         struct addr_location al;
694         struct machine *machine;
695         u8 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
696
697         ++top.samples;
698
699         switch (origin) {
700         case PERF_RECORD_MISC_USER:
701                 ++top.us_samples;
702                 if (top.hide_user_symbols)
703                         return;
704                 machine = perf_session__find_host_machine(session);
705                 break;
706         case PERF_RECORD_MISC_KERNEL:
707                 ++top.kernel_samples;
708                 if (top.hide_kernel_symbols)
709                         return;
710                 machine = perf_session__find_host_machine(session);
711                 break;
712         case PERF_RECORD_MISC_GUEST_KERNEL:
713                 ++top.guest_kernel_samples;
714                 machine = perf_session__find_machine(session, event->ip.pid);
715                 break;
716         case PERF_RECORD_MISC_GUEST_USER:
717                 ++top.guest_us_samples;
718                 /*
719                  * TODO: we don't process guest user from host side
720                  * except simple counting.
721                  */
722                 return;
723         default:
724                 return;
725         }
726
727         if (!machine && perf_guest) {
728                 pr_err("Can't find guest [%d]'s kernel information\n",
729                         event->ip.pid);
730                 return;
731         }
732
733         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
734                 top.exact_samples++;
735
736         if (perf_event__preprocess_sample(event, session, &al, sample,
737                                           symbol_filter) < 0 ||
738             al.filtered)
739                 return;
740
741         if (al.sym == NULL) {
742                 /*
743                  * As we do lazy loading of symtabs we only will know if the
744                  * specified vmlinux file is invalid when we actually have a
745                  * hit in kernel space and then try to load it. So if we get
746                  * here and there are _no_ symbols in the DSO backing the
747                  * kernel map, bail out.
748                  *
749                  * We may never get here, for instance, if we use -K/
750                  * --hide-kernel-symbols, even if the user specifies an
751                  * invalid --vmlinux ;-)
752                  */
753                 if (al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
754                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
755                         ui__warning("The %s file can't be used\n",
756                                     symbol_conf.vmlinux_name);
757                         exit_browser(0);
758                         exit(1);
759                 }
760
761                 return;
762         }
763
764         /* let's see, whether we need to install initial sym_filter_entry */
765         if (sym_filter_entry_sched) {
766                 top.sym_filter_entry = sym_filter_entry_sched;
767                 sym_filter_entry_sched = NULL;
768                 if (parse_source(top.sym_filter_entry) < 0) {
769                         struct symbol *sym = sym_entry__symbol(top.sym_filter_entry);
770
771                         pr_err("Can't annotate %s", sym->name);
772                         if (top.sym_filter_entry->map->dso->symtab_type == SYMTAB__KALLSYMS) {
773                                 pr_err(": No vmlinux file was found in the path:\n");
774                                 machine__fprintf_vmlinux_path(machine, stderr);
775                         } else
776                                 pr_err(".\n");
777                         exit(1);
778                 }
779         }
780
781         syme = symbol__priv(al.sym);
782         if (!syme->skip) {
783                 struct perf_evsel *evsel;
784
785                 evsel = perf_evlist__id2evsel(top.evlist, sample->id);
786                 assert(evsel != NULL);
787                 syme->count[evsel->idx]++;
788                 record_precise_ip(syme, evsel->idx, ip);
789                 pthread_mutex_lock(&top.active_symbols_lock);
790                 if (list_empty(&syme->node) || !syme->node.next) {
791                         static bool first = true;
792                         __list_insert_active_sym(syme);
793                         if (first) {
794                                 pthread_cond_broadcast(&top.active_symbols_cond);
795                                 first = false;
796                         }
797                 }
798                 pthread_mutex_unlock(&top.active_symbols_lock);
799         }
800 }
801
802 static void perf_session__mmap_read_cpu(struct perf_session *self, int cpu)
803 {
804         struct perf_sample sample;
805         union perf_event *event;
806
807         while ((event = perf_evlist__read_on_cpu(top.evlist, cpu)) != NULL) {
808                 perf_session__parse_sample(self, event, &sample);
809
810                 if (event->header.type == PERF_RECORD_SAMPLE)
811                         perf_event__process_sample(event, &sample, self);
812                 else
813                         perf_event__process(event, &sample, self);
814         }
815 }
816
817 static void perf_session__mmap_read(struct perf_session *self)
818 {
819         int i;
820
821         for (i = 0; i < top.evlist->cpus->nr; i++)
822                 perf_session__mmap_read_cpu(self, i);
823 }
824
825 static void start_counters(struct perf_evlist *evlist)
826 {
827         struct perf_evsel *counter;
828
829         list_for_each_entry(counter, &evlist->entries, node) {
830                 struct perf_event_attr *attr = &counter->attr;
831
832                 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
833
834                 if (top.freq) {
835                         attr->sample_type |= PERF_SAMPLE_PERIOD;
836                         attr->freq        = 1;
837                         attr->sample_freq = top.freq;
838                 }
839
840                 if (evlist->nr_entries > 1) {
841                         attr->sample_type |= PERF_SAMPLE_ID;
842                         attr->read_format |= PERF_FORMAT_ID;
843                 }
844
845                 attr->mmap = 1;
846 try_again:
847                 if (perf_evsel__open(counter, top.evlist->cpus,
848                                      top.evlist->threads, group, inherit) < 0) {
849                         int err = errno;
850
851                         if (err == EPERM || err == EACCES)
852                                 die("Permission error - are you root?\n"
853                                         "\t Consider tweaking"
854                                         " /proc/sys/kernel/perf_event_paranoid.\n");
855                         /*
856                          * If it's cycles then fall back to hrtimer
857                          * based cpu-clock-tick sw counter, which
858                          * is always available even if no PMU support:
859                          */
860                         if (attr->type == PERF_TYPE_HARDWARE &&
861                             attr->config == PERF_COUNT_HW_CPU_CYCLES) {
862
863                                 if (verbose)
864                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
865
866                                 attr->type = PERF_TYPE_SOFTWARE;
867                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
868                                 goto try_again;
869                         }
870                         printf("\n");
871                         error("sys_perf_event_open() syscall returned with %d "
872                               "(%s).  /bin/dmesg may provide additional information.\n",
873                               err, strerror(err));
874                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
875                         exit(-1);
876                 }
877         }
878
879         if (perf_evlist__mmap(evlist, mmap_pages, false) < 0)
880                 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
881 }
882
883 static int __cmd_top(void)
884 {
885         pthread_t thread;
886         int ret __used;
887         /*
888          * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
889          * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
890          */
891         struct perf_session *session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
892         if (session == NULL)
893                 return -ENOMEM;
894
895         if (top.target_tid != -1)
896                 perf_event__synthesize_thread_map(top.evlist->threads,
897                                                   perf_event__process, session);
898         else
899                 perf_event__synthesize_threads(perf_event__process, session);
900
901         start_counters(top.evlist);
902         session->evlist = top.evlist;
903         perf_session__update_sample_type(session);
904
905         /* Wait for a minimal set of events before starting the snapshot */
906         poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
907
908         perf_session__mmap_read(session);
909
910         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
911                                                              display_thread), session)) {
912                 printf("Could not create display thread.\n");
913                 exit(-1);
914         }
915
916         if (realtime_prio) {
917                 struct sched_param param;
918
919                 param.sched_priority = realtime_prio;
920                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
921                         printf("Could not set realtime priority.\n");
922                         exit(-1);
923                 }
924         }
925
926         while (1) {
927                 u64 hits = top.samples;
928
929                 perf_session__mmap_read(session);
930
931                 if (hits == top.samples)
932                         ret = poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
933         }
934
935         return 0;
936 }
937
938 static const char * const top_usage[] = {
939         "perf top [<options>]",
940         NULL
941 };
942
943 static const struct option options[] = {
944         OPT_CALLBACK('e', "event", &top.evlist, "event",
945                      "event selector. use 'perf list' to list available events",
946                      parse_events),
947         OPT_INTEGER('c', "count", &default_interval,
948                     "event period to sample"),
949         OPT_INTEGER('p', "pid", &top.target_pid,
950                     "profile events on existing process id"),
951         OPT_INTEGER('t', "tid", &top.target_tid,
952                     "profile events on existing thread id"),
953         OPT_BOOLEAN('a', "all-cpus", &system_wide,
954                             "system-wide collection from all CPUs"),
955         OPT_STRING('C', "cpu", &top.cpu_list, "cpu",
956                     "list of cpus to monitor"),
957         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
958                    "file", "vmlinux pathname"),
959         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
960                     "hide kernel symbols"),
961         OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
962         OPT_INTEGER('r', "realtime", &realtime_prio,
963                     "collect data with this RT SCHED_FIFO priority"),
964         OPT_INTEGER('d', "delay", &top.delay_secs,
965                     "number of seconds to delay between refreshes"),
966         OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
967                             "dump the symbol table used for profiling"),
968         OPT_INTEGER('f', "count-filter", &top.count_filter,
969                     "only display functions with more events than this"),
970         OPT_BOOLEAN('g', "group", &group,
971                             "put the counters into a counter group"),
972         OPT_BOOLEAN('i', "inherit", &inherit,
973                     "child tasks inherit counters"),
974         OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
975                     "symbol to annotate"),
976         OPT_BOOLEAN('z', "zero", &top.zero,
977                     "zero history across updates"),
978         OPT_INTEGER('F', "freq", &top.freq,
979                     "profile at this frequency"),
980         OPT_INTEGER('E', "entries", &top.print_entries,
981                     "display this many functions"),
982         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
983                     "hide user symbols"),
984         OPT_BOOLEAN(0, "tui", &use_tui, "Use the TUI interface"),
985         OPT_BOOLEAN(0, "stdio", &use_stdio, "Use the stdio interface"),
986         OPT_INCR('v', "verbose", &verbose,
987                     "be more verbose (show counter open errors, etc)"),
988         OPT_END()
989 };
990
991 int cmd_top(int argc, const char **argv, const char *prefix __used)
992 {
993         struct perf_evsel *pos;
994         int status = -ENOMEM;
995
996         top.evlist = perf_evlist__new(NULL, NULL);
997         if (top.evlist == NULL)
998                 return -ENOMEM;
999
1000         page_size = sysconf(_SC_PAGE_SIZE);
1001
1002         argc = parse_options(argc, argv, options, top_usage, 0);
1003         if (argc)
1004                 usage_with_options(top_usage, options);
1005
1006         /*
1007          * XXX For now start disabled, only using TUI if explicitely asked for.
1008          * Change that when handle_keys equivalent gets written, live annotation
1009          * done, etc.
1010          */
1011         use_browser = 0;
1012
1013         if (use_stdio)
1014                 use_browser = 0;
1015         else if (use_tui)
1016                 use_browser = 1;
1017
1018         setup_browser(false);
1019
1020         /* CPU and PID are mutually exclusive */
1021         if (top.target_tid > 0 && top.cpu_list) {
1022                 printf("WARNING: PID switch overriding CPU\n");
1023                 sleep(1);
1024                 top.cpu_list = NULL;
1025         }
1026
1027         if (top.target_pid != -1)
1028                 top.target_tid = top.target_pid;
1029
1030         if (perf_evlist__create_maps(top.evlist, top.target_pid,
1031                                      top.target_tid, top.cpu_list) < 0)
1032                 usage_with_options(top_usage, options);
1033
1034         if (!top.evlist->nr_entries &&
1035             perf_evlist__add_default(top.evlist) < 0) {
1036                 pr_err("Not enough memory for event selector list\n");
1037                 return -ENOMEM;
1038         }
1039
1040         if (top.delay_secs < 1)
1041                 top.delay_secs = 1;
1042
1043         /*
1044          * User specified count overrides default frequency.
1045          */
1046         if (default_interval)
1047                 top.freq = 0;
1048         else if (top.freq) {
1049                 default_interval = top.freq;
1050         } else {
1051                 fprintf(stderr, "frequency and count are zero, aborting\n");
1052                 exit(EXIT_FAILURE);
1053         }
1054
1055         list_for_each_entry(pos, &top.evlist->entries, node) {
1056                 if (perf_evsel__alloc_fd(pos, top.evlist->cpus->nr,
1057                                          top.evlist->threads->nr) < 0)
1058                         goto out_free_fd;
1059                 /*
1060                  * Fill in the ones not specifically initialized via -c:
1061                  */
1062                 if (pos->attr.sample_period)
1063                         continue;
1064
1065                 pos->attr.sample_period = default_interval;
1066         }
1067
1068         if (perf_evlist__alloc_pollfd(top.evlist) < 0 ||
1069             perf_evlist__alloc_mmap(top.evlist) < 0)
1070                 goto out_free_fd;
1071
1072         top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
1073
1074         symbol_conf.priv_size = (sizeof(struct sym_entry) + sizeof(struct annotation) +
1075                                  (top.evlist->nr_entries + 1) * sizeof(unsigned long));
1076
1077         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1078         if (symbol__init() < 0)
1079                 return -1;
1080
1081         get_term_dimensions(&winsize);
1082         if (top.print_entries == 0) {
1083                 update_print_entries(&winsize);
1084                 signal(SIGWINCH, sig_winch_handler);
1085         }
1086
1087         status = __cmd_top();
1088 out_free_fd:
1089         perf_evlist__delete(top.evlist);
1090
1091         return status;
1092 }