perf python: Add missing perf_event__parse_sample 'swapped' parm
[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 static struct perf_top top = {
66         .count_filter           = 5,
67         .delay_secs             = 2,
68         .display_weighted       = -1,
69         .target_pid             = -1,
70         .target_tid             = -1,
71         .active_symbols         = LIST_HEAD_INIT(top.active_symbols),
72         .active_symbols_lock    = PTHREAD_MUTEX_INITIALIZER,
73         .active_symbols_cond    = PTHREAD_COND_INITIALIZER,
74         .freq                   = 1000, /* 1 KHz */
75 };
76
77 static bool                     system_wide                     =  false;
78
79 static bool                     use_tui, use_stdio;
80
81 static int                      default_interval                =      0;
82
83 static bool                     kptr_restrict_warned;
84 static bool                     vmlinux_warned;
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, struct map *map,
195                               int counter, u64 ip)
196 {
197         struct annotation *notes;
198         struct symbol *sym;
199
200         if (syme != top.sym_filter_entry)
201                 return;
202
203         sym = sym_entry__symbol(syme);
204         notes = symbol__annotation(sym);
205
206         if (pthread_mutex_trylock(&notes->lock))
207                 return;
208
209         ip = map->map_ip(map, ip);
210         symbol__inc_addr_samples(sym, map, counter, ip);
211
212         pthread_mutex_unlock(&notes->lock);
213 }
214
215 static void show_details(struct sym_entry *syme)
216 {
217         struct annotation *notes;
218         struct symbol *symbol;
219         int more;
220
221         if (!syme)
222                 return;
223
224         symbol = sym_entry__symbol(syme);
225         notes = symbol__annotation(symbol);
226
227         pthread_mutex_lock(&notes->lock);
228
229         if (notes->src == NULL)
230                 goto out_unlock;
231
232         printf("Showing %s for %s\n", event_name(top.sym_evsel), symbol->name);
233         printf("  Events  Pcnt (>=%d%%)\n", sym_pcnt_filter);
234
235         more = symbol__annotate_printf(symbol, syme->map, top.sym_evsel->idx,
236                                        0, sym_pcnt_filter, top.print_entries, 4);
237         if (top.zero)
238                 symbol__annotate_zero_histogram(symbol, top.sym_evsel->idx);
239         else
240                 symbol__annotate_decay_histogram(symbol, top.sym_evsel->idx);
241         if (more != 0)
242                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
243 out_unlock:
244         pthread_mutex_unlock(&notes->lock);
245 }
246
247 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
248
249 static void __list_insert_active_sym(struct sym_entry *syme)
250 {
251         list_add(&syme->node, &top.active_symbols);
252 }
253
254 static void print_sym_table(struct perf_session *session)
255 {
256         char bf[160];
257         int printed = 0;
258         struct rb_node *nd;
259         struct sym_entry *syme;
260         struct rb_root tmp = RB_ROOT;
261         const int win_width = winsize.ws_col - 1;
262         int sym_width, dso_width, dso_short_width;
263         float sum_ksamples = perf_top__decay_samples(&top, &tmp);
264
265         puts(CONSOLE_CLEAR);
266
267         perf_top__header_snprintf(&top, bf, sizeof(bf));
268         printf("%s\n", bf);
269
270         perf_top__reset_sample_counters(&top);
271
272         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
273
274         if (session->hists.stats.total_lost != 0) {
275                 color_fprintf(stdout, PERF_COLOR_RED, "WARNING:");
276                 printf(" LOST %" PRIu64 " events, Check IO/CPU overload\n",
277                        session->hists.stats.total_lost);
278         }
279
280         if (top.sym_filter_entry) {
281                 show_details(top.sym_filter_entry);
282                 return;
283         }
284
285         perf_top__find_widths(&top, &tmp, &dso_width, &dso_short_width,
286                               &sym_width);
287
288         if (sym_width + dso_width > winsize.ws_col - 29) {
289                 dso_width = dso_short_width;
290                 if (sym_width + dso_width > winsize.ws_col - 29)
291                         sym_width = winsize.ws_col - dso_width - 29;
292         }
293         putchar('\n');
294         if (top.evlist->nr_entries == 1)
295                 printf("             samples  pcnt");
296         else
297                 printf("   weight    samples  pcnt");
298
299         if (verbose)
300                 printf("         RIP       ");
301         printf(" %-*.*s DSO\n", sym_width, sym_width, "function");
302         printf("   %s    _______ _____",
303                top.evlist->nr_entries == 1 ? "      " : "______");
304         if (verbose)
305                 printf(" ________________");
306         printf(" %-*.*s", sym_width, sym_width, graph_line);
307         printf(" %-*.*s", dso_width, dso_width, graph_line);
308         puts("\n");
309
310         for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
311                 struct symbol *sym;
312                 double pcnt;
313
314                 syme = rb_entry(nd, struct sym_entry, rb_node);
315                 sym = sym_entry__symbol(syme);
316                 if (++printed > top.print_entries ||
317                     (int)syme->snap_count < top.count_filter)
318                         continue;
319
320                 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
321                                          sum_ksamples));
322
323                 if (top.evlist->nr_entries == 1 || !top.display_weighted)
324                         printf("%20.2f ", syme->weight);
325                 else
326                         printf("%9.1f %10ld ", syme->weight, syme->snap_count);
327
328                 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
329                 if (verbose)
330                         printf(" %016" PRIx64, sym->start);
331                 printf(" %-*.*s", sym_width, sym_width, sym->name);
332                 printf(" %-*.*s\n", dso_width, dso_width,
333                        dso_width >= syme->map->dso->long_name_len ?
334                                         syme->map->dso->long_name :
335                                         syme->map->dso->short_name);
336         }
337 }
338
339 static void prompt_integer(int *target, const char *msg)
340 {
341         char *buf = malloc(0), *p;
342         size_t dummy = 0;
343         int tmp;
344
345         fprintf(stdout, "\n%s: ", msg);
346         if (getline(&buf, &dummy, stdin) < 0)
347                 return;
348
349         p = strchr(buf, '\n');
350         if (p)
351                 *p = 0;
352
353         p = buf;
354         while(*p) {
355                 if (!isdigit(*p))
356                         goto out_free;
357                 p++;
358         }
359         tmp = strtoul(buf, NULL, 10);
360         *target = tmp;
361 out_free:
362         free(buf);
363 }
364
365 static void prompt_percent(int *target, const char *msg)
366 {
367         int tmp = 0;
368
369         prompt_integer(&tmp, msg);
370         if (tmp >= 0 && tmp <= 100)
371                 *target = tmp;
372 }
373
374 static void prompt_symbol(struct sym_entry **target, const char *msg)
375 {
376         char *buf = malloc(0), *p;
377         struct sym_entry *syme = *target, *n, *found = NULL;
378         size_t dummy = 0;
379
380         /* zero counters of active symbol */
381         if (syme) {
382                 __zero_source_counters(syme);
383                 *target = NULL;
384         }
385
386         fprintf(stdout, "\n%s: ", msg);
387         if (getline(&buf, &dummy, stdin) < 0)
388                 goto out_free;
389
390         p = strchr(buf, '\n');
391         if (p)
392                 *p = 0;
393
394         pthread_mutex_lock(&top.active_symbols_lock);
395         syme = list_entry(top.active_symbols.next, struct sym_entry, node);
396         pthread_mutex_unlock(&top.active_symbols_lock);
397
398         list_for_each_entry_safe_from(syme, n, &top.active_symbols, node) {
399                 struct symbol *sym = sym_entry__symbol(syme);
400
401                 if (!strcmp(buf, sym->name)) {
402                         found = syme;
403                         break;
404                 }
405         }
406
407         if (!found) {
408                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
409                 sleep(1);
410                 return;
411         } else
412                 parse_source(found);
413
414 out_free:
415         free(buf);
416 }
417
418 static void print_mapped_keys(void)
419 {
420         char *name = NULL;
421
422         if (top.sym_filter_entry) {
423                 struct symbol *sym = sym_entry__symbol(top.sym_filter_entry);
424                 name = sym->name;
425         }
426
427         fprintf(stdout, "\nMapped keys:\n");
428         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top.delay_secs);
429         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top.print_entries);
430
431         if (top.evlist->nr_entries > 1)
432                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", event_name(top.sym_evsel));
433
434         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top.count_filter);
435
436         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
437         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
438         fprintf(stdout, "\t[S]     stop annotation.\n");
439
440         if (top.evlist->nr_entries > 1)
441                 fprintf(stdout, "\t[w]     toggle display weighted/count[E]r. \t(%d)\n", top.display_weighted ? 1 : 0);
442
443         fprintf(stdout,
444                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
445                 top.hide_kernel_symbols ? "yes" : "no");
446         fprintf(stdout,
447                 "\t[U]     hide user symbols.               \t(%s)\n",
448                 top.hide_user_symbols ? "yes" : "no");
449         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top.zero ? 1 : 0);
450         fprintf(stdout, "\t[qQ]    quit.\n");
451 }
452
453 static int key_mapped(int c)
454 {
455         switch (c) {
456                 case 'd':
457                 case 'e':
458                 case 'f':
459                 case 'z':
460                 case 'q':
461                 case 'Q':
462                 case 'K':
463                 case 'U':
464                 case 'F':
465                 case 's':
466                 case 'S':
467                         return 1;
468                 case 'E':
469                 case 'w':
470                         return top.evlist->nr_entries > 1 ? 1 : 0;
471                 default:
472                         break;
473         }
474
475         return 0;
476 }
477
478 static void handle_keypress(struct perf_session *session, int c)
479 {
480         if (!key_mapped(c)) {
481                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
482                 struct termios tc, save;
483
484                 print_mapped_keys();
485                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
486                 fflush(stdout);
487
488                 tcgetattr(0, &save);
489                 tc = save;
490                 tc.c_lflag &= ~(ICANON | ECHO);
491                 tc.c_cc[VMIN] = 0;
492                 tc.c_cc[VTIME] = 0;
493                 tcsetattr(0, TCSANOW, &tc);
494
495                 poll(&stdin_poll, 1, -1);
496                 c = getc(stdin);
497
498                 tcsetattr(0, TCSAFLUSH, &save);
499                 if (!key_mapped(c))
500                         return;
501         }
502
503         switch (c) {
504                 case 'd':
505                         prompt_integer(&top.delay_secs, "Enter display delay");
506                         if (top.delay_secs < 1)
507                                 top.delay_secs = 1;
508                         break;
509                 case 'e':
510                         prompt_integer(&top.print_entries, "Enter display entries (lines)");
511                         if (top.print_entries == 0) {
512                                 sig_winch_handler(SIGWINCH);
513                                 signal(SIGWINCH, sig_winch_handler);
514                         } else
515                                 signal(SIGWINCH, SIG_DFL);
516                         break;
517                 case 'E':
518                         if (top.evlist->nr_entries > 1) {
519                                 /* Select 0 as the default event: */
520                                 int counter = 0;
521
522                                 fprintf(stderr, "\nAvailable events:");
523
524                                 list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
525                                         fprintf(stderr, "\n\t%d %s", top.sym_evsel->idx, event_name(top.sym_evsel));
526
527                                 prompt_integer(&counter, "Enter details event counter");
528
529                                 if (counter >= top.evlist->nr_entries) {
530                                         top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
531                                         fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(top.sym_evsel));
532                                         sleep(1);
533                                         break;
534                                 }
535                                 list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
536                                         if (top.sym_evsel->idx == counter)
537                                                 break;
538                         } else
539                                 top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
540                         break;
541                 case 'f':
542                         prompt_integer(&top.count_filter, "Enter display event count filter");
543                         break;
544                 case 'F':
545                         prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
546                         break;
547                 case 'K':
548                         top.hide_kernel_symbols = !top.hide_kernel_symbols;
549                         break;
550                 case 'q':
551                 case 'Q':
552                         printf("exiting.\n");
553                         if (dump_symtab)
554                                 perf_session__fprintf_dsos(session, stderr);
555                         exit(0);
556                 case 's':
557                         prompt_symbol(&top.sym_filter_entry, "Enter details symbol");
558                         break;
559                 case 'S':
560                         if (!top.sym_filter_entry)
561                                 break;
562                         else {
563                                 struct sym_entry *syme = top.sym_filter_entry;
564
565                                 top.sym_filter_entry = NULL;
566                                 __zero_source_counters(syme);
567                         }
568                         break;
569                 case 'U':
570                         top.hide_user_symbols = !top.hide_user_symbols;
571                         break;
572                 case 'w':
573                         top.display_weighted = ~top.display_weighted;
574                         break;
575                 case 'z':
576                         top.zero = !top.zero;
577                         break;
578                 default:
579                         break;
580         }
581 }
582
583 static void *display_thread_tui(void *arg __used)
584 {
585         int err = 0;
586         pthread_mutex_lock(&top.active_symbols_lock);
587         while (list_empty(&top.active_symbols)) {
588                 err = pthread_cond_wait(&top.active_symbols_cond,
589                                         &top.active_symbols_lock);
590                 if (err)
591                         break;
592         }
593         pthread_mutex_unlock(&top.active_symbols_lock);
594         if (!err)
595                 perf_top__tui_browser(&top);
596         exit_browser(0);
597         exit(0);
598         return NULL;
599 }
600
601 static void *display_thread(void *arg __used)
602 {
603         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
604         struct termios tc, save;
605         int delay_msecs, c;
606         struct perf_session *session = (struct perf_session *) arg;
607
608         tcgetattr(0, &save);
609         tc = save;
610         tc.c_lflag &= ~(ICANON | ECHO);
611         tc.c_cc[VMIN] = 0;
612         tc.c_cc[VTIME] = 0;
613
614 repeat:
615         delay_msecs = top.delay_secs * 1000;
616         tcsetattr(0, TCSANOW, &tc);
617         /* trash return*/
618         getc(stdin);
619
620         do {
621                 print_sym_table(session);
622         } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
623
624         c = getc(stdin);
625         tcsetattr(0, TCSAFLUSH, &save);
626
627         handle_keypress(session, c);
628         goto repeat;
629
630         return NULL;
631 }
632
633 /* Tag samples to be skipped. */
634 static const char *skip_symbols[] = {
635         "default_idle",
636         "native_safe_halt",
637         "cpu_idle",
638         "enter_idle",
639         "exit_idle",
640         "mwait_idle",
641         "mwait_idle_with_hints",
642         "poll_idle",
643         "ppc64_runlatch_off",
644         "pseries_dedicated_idle_sleep",
645         NULL
646 };
647
648 static int symbol_filter(struct map *map, struct symbol *sym)
649 {
650         struct sym_entry *syme;
651         const char *name = sym->name;
652         int i;
653
654         /*
655          * ppc64 uses function descriptors and appends a '.' to the
656          * start of every instruction address. Remove it.
657          */
658         if (name[0] == '.')
659                 name++;
660
661         if (!strcmp(name, "_text") ||
662             !strcmp(name, "_etext") ||
663             !strcmp(name, "_sinittext") ||
664             !strncmp("init_module", name, 11) ||
665             !strncmp("cleanup_module", name, 14) ||
666             strstr(name, "_text_start") ||
667             strstr(name, "_text_end"))
668                 return 1;
669
670         syme = symbol__priv(sym);
671         syme->map = map;
672         symbol__annotate_init(map, sym);
673
674         if (!top.sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
675                 /* schedule initial sym_filter_entry setup */
676                 sym_filter_entry_sched = syme;
677                 sym_filter = NULL;
678         }
679
680         for (i = 0; skip_symbols[i]; i++) {
681                 if (!strcmp(skip_symbols[i], name)) {
682                         sym->ignore = true;
683                         break;
684                 }
685         }
686
687         return 0;
688 }
689
690 static void perf_event__process_sample(const union perf_event *event,
691                                        struct perf_sample *sample,
692                                        struct perf_session *session)
693 {
694         u64 ip = event->ip.ip;
695         struct sym_entry *syme;
696         struct addr_location al;
697         struct machine *machine;
698         u8 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
699
700         ++top.samples;
701
702         switch (origin) {
703         case PERF_RECORD_MISC_USER:
704                 ++top.us_samples;
705                 if (top.hide_user_symbols)
706                         return;
707                 machine = perf_session__find_host_machine(session);
708                 break;
709         case PERF_RECORD_MISC_KERNEL:
710                 ++top.kernel_samples;
711                 if (top.hide_kernel_symbols)
712                         return;
713                 machine = perf_session__find_host_machine(session);
714                 break;
715         case PERF_RECORD_MISC_GUEST_KERNEL:
716                 ++top.guest_kernel_samples;
717                 machine = perf_session__find_machine(session, event->ip.pid);
718                 break;
719         case PERF_RECORD_MISC_GUEST_USER:
720                 ++top.guest_us_samples;
721                 /*
722                  * TODO: we don't process guest user from host side
723                  * except simple counting.
724                  */
725                 return;
726         default:
727                 return;
728         }
729
730         if (!machine && perf_guest) {
731                 pr_err("Can't find guest [%d]'s kernel information\n",
732                         event->ip.pid);
733                 return;
734         }
735
736         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
737                 top.exact_samples++;
738
739         if (perf_event__preprocess_sample(event, session, &al, sample,
740                                           symbol_filter) < 0 ||
741             al.filtered)
742                 return;
743
744         if (!kptr_restrict_warned &&
745             symbol_conf.kptr_restrict &&
746             al.cpumode == PERF_RECORD_MISC_KERNEL) {
747                 ui__warning(
748 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
749 "Check /proc/sys/kernel/kptr_restrict.\n\n"
750 "Kernel%s samples will not be resolved.\n",
751                           !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
752                           " modules" : "");
753                 if (use_browser <= 0)
754                         sleep(5);
755                 kptr_restrict_warned = true;
756         }
757
758         if (al.sym == NULL) {
759                 const char *msg = "Kernel samples will not be resolved.\n";
760                 /*
761                  * As we do lazy loading of symtabs we only will know if the
762                  * specified vmlinux file is invalid when we actually have a
763                  * hit in kernel space and then try to load it. So if we get
764                  * here and there are _no_ symbols in the DSO backing the
765                  * kernel map, bail out.
766                  *
767                  * We may never get here, for instance, if we use -K/
768                  * --hide-kernel-symbols, even if the user specifies an
769                  * invalid --vmlinux ;-)
770                  */
771                 if (!kptr_restrict_warned && !vmlinux_warned &&
772                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
773                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
774                         if (symbol_conf.vmlinux_name) {
775                                 ui__warning("The %s file can't be used.\n%s",
776                                             symbol_conf.vmlinux_name, msg);
777                         } else {
778                                 ui__warning("A vmlinux file was not found.\n%s",
779                                             msg);
780                         }
781
782                         if (use_browser <= 0)
783                                 sleep(5);
784                         vmlinux_warned = true;
785                 }
786
787                 return;
788         }
789
790         /* let's see, whether we need to install initial sym_filter_entry */
791         if (sym_filter_entry_sched) {
792                 top.sym_filter_entry = sym_filter_entry_sched;
793                 sym_filter_entry_sched = NULL;
794                 if (parse_source(top.sym_filter_entry) < 0) {
795                         struct symbol *sym = sym_entry__symbol(top.sym_filter_entry);
796
797                         pr_err("Can't annotate %s", sym->name);
798                         if (top.sym_filter_entry->map->dso->symtab_type == SYMTAB__KALLSYMS) {
799                                 pr_err(": No vmlinux file was found in the path:\n");
800                                 machine__fprintf_vmlinux_path(machine, stderr);
801                         } else
802                                 pr_err(".\n");
803                         exit(1);
804                 }
805         }
806
807         syme = symbol__priv(al.sym);
808         if (!al.sym->ignore) {
809                 struct perf_evsel *evsel;
810
811                 evsel = perf_evlist__id2evsel(top.evlist, sample->id);
812                 assert(evsel != NULL);
813                 syme->count[evsel->idx]++;
814                 record_precise_ip(syme, al.map, evsel->idx, ip);
815                 pthread_mutex_lock(&top.active_symbols_lock);
816                 if (list_empty(&syme->node) || !syme->node.next) {
817                         static bool first = true;
818                         __list_insert_active_sym(syme);
819                         if (first) {
820                                 pthread_cond_broadcast(&top.active_symbols_cond);
821                                 first = false;
822                         }
823                 }
824                 pthread_mutex_unlock(&top.active_symbols_lock);
825         }
826 }
827
828 static void perf_session__mmap_read_idx(struct perf_session *self, int idx)
829 {
830         struct perf_sample sample;
831         union perf_event *event;
832         int ret;
833
834         while ((event = perf_evlist__mmap_read(top.evlist, idx)) != NULL) {
835                 ret = perf_session__parse_sample(self, event, &sample);
836                 if (ret) {
837                         pr_err("Can't parse sample, err = %d\n", ret);
838                         continue;
839                 }
840
841                 if (event->header.type == PERF_RECORD_SAMPLE)
842                         perf_event__process_sample(event, &sample, self);
843                 else
844                         perf_event__process(event, &sample, self);
845         }
846 }
847
848 static void perf_session__mmap_read(struct perf_session *self)
849 {
850         int i;
851
852         for (i = 0; i < top.evlist->nr_mmaps; i++)
853                 perf_session__mmap_read_idx(self, i);
854 }
855
856 static void start_counters(struct perf_evlist *evlist)
857 {
858         struct perf_evsel *counter;
859
860         list_for_each_entry(counter, &evlist->entries, node) {
861                 struct perf_event_attr *attr = &counter->attr;
862
863                 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
864
865                 if (top.freq) {
866                         attr->sample_type |= PERF_SAMPLE_PERIOD;
867                         attr->freq        = 1;
868                         attr->sample_freq = top.freq;
869                 }
870
871                 if (evlist->nr_entries > 1) {
872                         attr->sample_type |= PERF_SAMPLE_ID;
873                         attr->read_format |= PERF_FORMAT_ID;
874                 }
875
876                 attr->mmap = 1;
877                 attr->inherit = inherit;
878 try_again:
879                 if (perf_evsel__open(counter, top.evlist->cpus,
880                                      top.evlist->threads, group) < 0) {
881                         int err = errno;
882
883                         if (err == EPERM || err == EACCES) {
884                                 ui__warning_paranoid();
885                                 goto out_err;
886                         }
887                         /*
888                          * If it's cycles then fall back to hrtimer
889                          * based cpu-clock-tick sw counter, which
890                          * is always available even if no PMU support:
891                          */
892                         if (attr->type == PERF_TYPE_HARDWARE &&
893                             attr->config == PERF_COUNT_HW_CPU_CYCLES) {
894                                 if (verbose)
895                                         ui__warning("Cycles event not supported,\n"
896                                                     "trying to fall back to cpu-clock-ticks\n");
897
898                                 attr->type = PERF_TYPE_SOFTWARE;
899                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
900                                 goto try_again;
901                         }
902
903                         if (err == ENOENT) {
904                                 ui__warning("The %s event is not supported.\n",
905                                             event_name(counter));
906                                 goto out_err;
907                         }
908
909                         ui__warning("The sys_perf_event_open() syscall "
910                                     "returned with %d (%s).  /bin/dmesg "
911                                     "may provide additional information.\n"
912                                     "No CONFIG_PERF_EVENTS=y kernel support "
913                                     "configured?\n", err, strerror(err));
914                         goto out_err;
915                 }
916         }
917
918         if (perf_evlist__mmap(evlist, mmap_pages, false) < 0) {
919                 ui__warning("Failed to mmap with %d (%s)\n",
920                             errno, strerror(errno));
921                 goto out_err;
922         }
923
924         return;
925
926 out_err:
927         exit_browser(0);
928         exit(0);
929 }
930
931 static int __cmd_top(void)
932 {
933         pthread_t thread;
934         int ret __used;
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         struct perf_session *session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
940         if (session == NULL)
941                 return -ENOMEM;
942
943         if (top.target_tid != -1)
944                 perf_event__synthesize_thread_map(top.evlist->threads,
945                                                   perf_event__process, session);
946         else
947                 perf_event__synthesize_threads(perf_event__process, session);
948
949         start_counters(top.evlist);
950         session->evlist = top.evlist;
951         perf_session__update_sample_type(session);
952
953         /* Wait for a minimal set of events before starting the snapshot */
954         poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
955
956         perf_session__mmap_read(session);
957
958         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
959                                                              display_thread), session)) {
960                 printf("Could not create display thread.\n");
961                 exit(-1);
962         }
963
964         if (realtime_prio) {
965                 struct sched_param param;
966
967                 param.sched_priority = realtime_prio;
968                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
969                         printf("Could not set realtime priority.\n");
970                         exit(-1);
971                 }
972         }
973
974         while (1) {
975                 u64 hits = top.samples;
976
977                 perf_session__mmap_read(session);
978
979                 if (hits == top.samples)
980                         ret = poll(top.evlist->pollfd, top.evlist->nr_fds, 100);
981         }
982
983         return 0;
984 }
985
986 static const char * const top_usage[] = {
987         "perf top [<options>]",
988         NULL
989 };
990
991 static const struct option options[] = {
992         OPT_CALLBACK('e', "event", &top.evlist, "event",
993                      "event selector. use 'perf list' to list available events",
994                      parse_events_option),
995         OPT_INTEGER('c', "count", &default_interval,
996                     "event period to sample"),
997         OPT_INTEGER('p', "pid", &top.target_pid,
998                     "profile events on existing process id"),
999         OPT_INTEGER('t', "tid", &top.target_tid,
1000                     "profile events on existing thread id"),
1001         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1002                             "system-wide collection from all CPUs"),
1003         OPT_STRING('C', "cpu", &top.cpu_list, "cpu",
1004                     "list of cpus to monitor"),
1005         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1006                    "file", "vmlinux pathname"),
1007         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1008                     "hide kernel symbols"),
1009         OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
1010         OPT_INTEGER('r', "realtime", &realtime_prio,
1011                     "collect data with this RT SCHED_FIFO priority"),
1012         OPT_INTEGER('d', "delay", &top.delay_secs,
1013                     "number of seconds to delay between refreshes"),
1014         OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1015                             "dump the symbol table used for profiling"),
1016         OPT_INTEGER('f', "count-filter", &top.count_filter,
1017                     "only display functions with more events than this"),
1018         OPT_BOOLEAN('g', "group", &group,
1019                             "put the counters into a counter group"),
1020         OPT_BOOLEAN('i', "inherit", &inherit,
1021                     "child tasks inherit counters"),
1022         OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1023                     "symbol to annotate"),
1024         OPT_BOOLEAN('z', "zero", &top.zero,
1025                     "zero history across updates"),
1026         OPT_INTEGER('F', "freq", &top.freq,
1027                     "profile at this frequency"),
1028         OPT_INTEGER('E', "entries", &top.print_entries,
1029                     "display this many functions"),
1030         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1031                     "hide user symbols"),
1032         OPT_BOOLEAN(0, "tui", &use_tui, "Use the TUI interface"),
1033         OPT_BOOLEAN(0, "stdio", &use_stdio, "Use the stdio interface"),
1034         OPT_INCR('v', "verbose", &verbose,
1035                     "be more verbose (show counter open errors, etc)"),
1036         OPT_END()
1037 };
1038
1039 int cmd_top(int argc, const char **argv, const char *prefix __used)
1040 {
1041         struct perf_evsel *pos;
1042         int status = -ENOMEM;
1043
1044         top.evlist = perf_evlist__new(NULL, NULL);
1045         if (top.evlist == NULL)
1046                 return -ENOMEM;
1047
1048         page_size = sysconf(_SC_PAGE_SIZE);
1049
1050         argc = parse_options(argc, argv, options, top_usage, 0);
1051         if (argc)
1052                 usage_with_options(top_usage, options);
1053
1054         /*
1055          * XXX For now start disabled, only using TUI if explicitely asked for.
1056          * Change that when handle_keys equivalent gets written, live annotation
1057          * done, etc.
1058          */
1059         use_browser = 0;
1060
1061         if (use_stdio)
1062                 use_browser = 0;
1063         else if (use_tui)
1064                 use_browser = 1;
1065
1066         setup_browser(false);
1067
1068         /* CPU and PID are mutually exclusive */
1069         if (top.target_tid > 0 && top.cpu_list) {
1070                 printf("WARNING: PID switch overriding CPU\n");
1071                 sleep(1);
1072                 top.cpu_list = NULL;
1073         }
1074
1075         if (top.target_pid != -1)
1076                 top.target_tid = top.target_pid;
1077
1078         if (perf_evlist__create_maps(top.evlist, top.target_pid,
1079                                      top.target_tid, top.cpu_list) < 0)
1080                 usage_with_options(top_usage, options);
1081
1082         if (!top.evlist->nr_entries &&
1083             perf_evlist__add_default(top.evlist) < 0) {
1084                 pr_err("Not enough memory for event selector list\n");
1085                 return -ENOMEM;
1086         }
1087
1088         if (top.delay_secs < 1)
1089                 top.delay_secs = 1;
1090
1091         /*
1092          * User specified count overrides default frequency.
1093          */
1094         if (default_interval)
1095                 top.freq = 0;
1096         else if (top.freq) {
1097                 default_interval = top.freq;
1098         } else {
1099                 fprintf(stderr, "frequency and count are zero, aborting\n");
1100                 exit(EXIT_FAILURE);
1101         }
1102
1103         list_for_each_entry(pos, &top.evlist->entries, node) {
1104                 if (perf_evsel__alloc_fd(pos, top.evlist->cpus->nr,
1105                                          top.evlist->threads->nr) < 0)
1106                         goto out_free_fd;
1107                 /*
1108                  * Fill in the ones not specifically initialized via -c:
1109                  */
1110                 if (pos->attr.sample_period)
1111                         continue;
1112
1113                 pos->attr.sample_period = default_interval;
1114         }
1115
1116         if (perf_evlist__alloc_pollfd(top.evlist) < 0 ||
1117             perf_evlist__alloc_mmap(top.evlist) < 0)
1118                 goto out_free_fd;
1119
1120         top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
1121
1122         symbol_conf.priv_size = (sizeof(struct sym_entry) + sizeof(struct annotation) +
1123                                  (top.evlist->nr_entries + 1) * sizeof(unsigned long));
1124
1125         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1126         if (symbol__init() < 0)
1127                 return -1;
1128
1129         get_term_dimensions(&winsize);
1130         if (top.print_entries == 0) {
1131                 update_print_entries(&winsize);
1132                 signal(SIGWINCH, sig_winch_handler);
1133         }
1134
1135         status = __cmd_top();
1136 out_free_fd:
1137         perf_evlist__delete(top.evlist);
1138
1139         return status;
1140 }