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Linux/tools/perf/builtin-annotate.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * builtin-annotate.c
  4  *
  5  * Builtin annotate command: Analyze the perf.data input file,
  6  * look up and read DSOs and symbol information and display
  7  * a histogram of results, along various sorting keys.
  8  */
  9 #include "builtin.h"
 10 
 11 #include "util/color.h"
 12 #include <linux/list.h>
 13 #include "util/cache.h"
 14 #include <linux/rbtree.h>
 15 #include <linux/zalloc.h>
 16 #include "util/symbol.h"
 17 
 18 #include "perf.h"
 19 #include "util/debug.h"
 20 
 21 #include "util/evlist.h"
 22 #include "util/evsel.h"
 23 #include "util/annotate.h"
 24 #include "util/event.h"
 25 #include <subcmd/parse-options.h>
 26 #include "util/parse-events.h"
 27 #include "util/sort.h"
 28 #include "util/hist.h"
 29 #include "util/dso.h"
 30 #include "util/machine.h"
 31 #include "util/map.h"
 32 #include "util/session.h"
 33 #include "util/tool.h"
 34 #include "util/data.h"
 35 #include "arch/common.h"
 36 #include "util/block-range.h"
 37 #include "util/map_symbol.h"
 38 #include "util/branch.h"
 39 
 40 #include <dlfcn.h>
 41 #include <errno.h>
 42 #include <linux/bitmap.h>
 43 #include <linux/err.h>
 44 
 45 struct perf_annotate {
 46         struct perf_tool tool;
 47         struct perf_session *session;
 48         struct annotation_options opts;
 49         bool       use_tui, use_stdio, use_stdio2, use_gtk;
 50         bool       skip_missing;
 51         bool       has_br_stack;
 52         bool       group_set;
 53         const char *sym_hist_filter;
 54         const char *cpu_list;
 55         DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 56 };
 57 
 58 /*
 59  * Given one basic block:
 60  *
 61  *      from    to              branch_i
 62  *      * ----> *
 63  *              |
 64  *              | block
 65  *              v
 66  *              * ----> *
 67  *              from    to      branch_i+1
 68  *
 69  * where the horizontal are the branches and the vertical is the executed
 70  * block of instructions.
 71  *
 72  * We count, for each 'instruction', the number of blocks that covered it as
 73  * well as count the ratio each branch is taken.
 74  *
 75  * We can do this without knowing the actual instruction stream by keeping
 76  * track of the address ranges. We break down ranges such that there is no
 77  * overlap and iterate from the start until the end.
 78  *
 79  * @acme: once we parse the objdump output _before_ processing the samples,
 80  * we can easily fold the branch.cycles IPC bits in.
 81  */
 82 static void process_basic_block(struct addr_map_symbol *start,
 83                                 struct addr_map_symbol *end,
 84                                 struct branch_flags *flags)
 85 {
 86         struct symbol *sym = start->ms.sym;
 87         struct annotation *notes = sym ? symbol__annotation(sym) : NULL;
 88         struct block_range_iter iter;
 89         struct block_range *entry;
 90 
 91         /*
 92          * Sanity; NULL isn't executable and the CPU cannot execute backwards
 93          */
 94         if (!start->addr || start->addr > end->addr)
 95                 return;
 96 
 97         iter = block_range__create(start->addr, end->addr);
 98         if (!block_range_iter__valid(&iter))
 99                 return;
100 
101         /*
102          * First block in range is a branch target.
103          */
104         entry = block_range_iter(&iter);
105         assert(entry->is_target);
106         entry->entry++;
107 
108         do {
109                 entry = block_range_iter(&iter);
110 
111                 entry->coverage++;
112                 entry->sym = sym;
113 
114                 if (notes)
115                         notes->max_coverage = max(notes->max_coverage, entry->coverage);
116 
117         } while (block_range_iter__next(&iter));
118 
119         /*
120          * Last block in rage is a branch.
121          */
122         entry = block_range_iter(&iter);
123         assert(entry->is_branch);
124         entry->taken++;
125         if (flags->predicted)
126                 entry->pred++;
127 }
128 
129 static void process_branch_stack(struct branch_stack *bs, struct addr_location *al,
130                                  struct perf_sample *sample)
131 {
132         struct addr_map_symbol *prev = NULL;
133         struct branch_info *bi;
134         int i;
135 
136         if (!bs || !bs->nr)
137                 return;
138 
139         bi = sample__resolve_bstack(sample, al);
140         if (!bi)
141                 return;
142 
143         for (i = bs->nr - 1; i >= 0; i--) {
144                 /*
145                  * XXX filter against symbol
146                  */
147                 if (prev)
148                         process_basic_block(prev, &bi[i].from, &bi[i].flags);
149                 prev = &bi[i].to;
150         }
151 
152         free(bi);
153 }
154 
155 static int hist_iter__branch_callback(struct hist_entry_iter *iter,
156                                       struct addr_location *al __maybe_unused,
157                                       bool single __maybe_unused,
158                                       void *arg __maybe_unused)
159 {
160         struct hist_entry *he = iter->he;
161         struct branch_info *bi;
162         struct perf_sample *sample = iter->sample;
163         struct evsel *evsel = iter->evsel;
164         int err;
165 
166         bi = he->branch_info;
167         err = addr_map_symbol__inc_samples(&bi->from, sample, evsel);
168 
169         if (err)
170                 goto out;
171 
172         err = addr_map_symbol__inc_samples(&bi->to, sample, evsel);
173 
174 out:
175         return err;
176 }
177 
178 static int process_branch_callback(struct evsel *evsel,
179                                    struct perf_sample *sample,
180                                    struct addr_location *al __maybe_unused,
181                                    struct perf_annotate *ann,
182                                    struct machine *machine)
183 {
184         struct hist_entry_iter iter = {
185                 .evsel          = evsel,
186                 .sample         = sample,
187                 .add_entry_cb   = hist_iter__branch_callback,
188                 .hide_unresolved        = symbol_conf.hide_unresolved,
189                 .ops            = &hist_iter_branch,
190         };
191 
192         struct addr_location a;
193         int ret;
194 
195         if (machine__resolve(machine, &a, sample) < 0)
196                 return -1;
197 
198         if (a.sym == NULL)
199                 return 0;
200 
201         if (a.map != NULL)
202                 a.map->dso->hit = 1;
203 
204         hist__account_cycles(sample->branch_stack, al, sample, false, NULL);
205 
206         ret = hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
207         return ret;
208 }
209 
210 static bool has_annotation(struct perf_annotate *ann)
211 {
212         return ui__has_annotation() || ann->use_stdio2;
213 }
214 
215 static int perf_evsel__add_sample(struct evsel *evsel,
216                                   struct perf_sample *sample,
217                                   struct addr_location *al,
218                                   struct perf_annotate *ann,
219                                   struct machine *machine)
220 {
221         struct hists *hists = evsel__hists(evsel);
222         struct hist_entry *he;
223         int ret;
224 
225         if ((!ann->has_br_stack || !has_annotation(ann)) &&
226             ann->sym_hist_filter != NULL &&
227             (al->sym == NULL ||
228              strcmp(ann->sym_hist_filter, al->sym->name) != 0)) {
229                 /* We're only interested in a symbol named sym_hist_filter */
230                 /*
231                  * FIXME: why isn't this done in the symbol_filter when loading
232                  * the DSO?
233                  */
234                 if (al->sym != NULL) {
235                         rb_erase_cached(&al->sym->rb_node,
236                                  &al->map->dso->symbols);
237                         symbol__delete(al->sym);
238                         dso__reset_find_symbol_cache(al->map->dso);
239                 }
240                 return 0;
241         }
242 
243         /*
244          * XXX filtered samples can still have branch entires pointing into our
245          * symbol and are missed.
246          */
247         process_branch_stack(sample->branch_stack, al, sample);
248 
249         if (ann->has_br_stack && has_annotation(ann))
250                 return process_branch_callback(evsel, sample, al, ann, machine);
251 
252         he = hists__add_entry(hists, al, NULL, NULL, NULL, sample, true);
253         if (he == NULL)
254                 return -ENOMEM;
255 
256         ret = hist_entry__inc_addr_samples(he, sample, evsel, al->addr);
257         hists__inc_nr_samples(hists, true);
258         return ret;
259 }
260 
261 static int process_sample_event(struct perf_tool *tool,
262                                 union perf_event *event,
263                                 struct perf_sample *sample,
264                                 struct evsel *evsel,
265                                 struct machine *machine)
266 {
267         struct perf_annotate *ann = container_of(tool, struct perf_annotate, tool);
268         struct addr_location al;
269         int ret = 0;
270 
271         if (machine__resolve(machine, &al, sample) < 0) {
272                 pr_warning("problem processing %d event, skipping it.\n",
273                            event->header.type);
274                 return -1;
275         }
276 
277         if (ann->cpu_list && !test_bit(sample->cpu, ann->cpu_bitmap))
278                 goto out_put;
279 
280         if (!al.filtered &&
281             perf_evsel__add_sample(evsel, sample, &al, ann, machine)) {
282                 pr_warning("problem incrementing symbol count, "
283                            "skipping event\n");
284                 ret = -1;
285         }
286 out_put:
287         addr_location__put(&al);
288         return ret;
289 }
290 
291 static int process_feature_event(struct perf_session *session,
292                                  union perf_event *event)
293 {
294         if (event->feat.feat_id < HEADER_LAST_FEATURE)
295                 return perf_event__process_feature(session, event);
296         return 0;
297 }
298 
299 static int hist_entry__tty_annotate(struct hist_entry *he,
300                                     struct evsel *evsel,
301                                     struct perf_annotate *ann)
302 {
303         if (!ann->use_stdio2)
304                 return symbol__tty_annotate(&he->ms, evsel, &ann->opts);
305 
306         return symbol__tty_annotate2(&he->ms, evsel, &ann->opts);
307 }
308 
309 static void hists__find_annotations(struct hists *hists,
310                                     struct evsel *evsel,
311                                     struct perf_annotate *ann)
312 {
313         struct rb_node *nd = rb_first_cached(&hists->entries), *next;
314         int key = K_RIGHT;
315 
316         while (nd) {
317                 struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
318                 struct annotation *notes;
319 
320                 if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
321                         goto find_next;
322 
323                 if (ann->sym_hist_filter &&
324                     (strcmp(he->ms.sym->name, ann->sym_hist_filter) != 0))
325                         goto find_next;
326 
327                 notes = symbol__annotation(he->ms.sym);
328                 if (notes->src == NULL) {
329 find_next:
330                         if (key == K_LEFT)
331                                 nd = rb_prev(nd);
332                         else
333                                 nd = rb_next(nd);
334                         continue;
335                 }
336 
337                 if (use_browser == 2) {
338                         int ret;
339                         int (*annotate)(struct hist_entry *he,
340                                         struct evsel *evsel,
341                                         struct hist_browser_timer *hbt);
342 
343                         annotate = dlsym(perf_gtk_handle,
344                                          "hist_entry__gtk_annotate");
345                         if (annotate == NULL) {
346                                 ui__error("GTK browser not found!\n");
347                                 return;
348                         }
349 
350                         ret = annotate(he, evsel, NULL);
351                         if (!ret || !ann->skip_missing)
352                                 return;
353 
354                         /* skip missing symbols */
355                         nd = rb_next(nd);
356                 } else if (use_browser == 1) {
357                         key = hist_entry__tui_annotate(he, evsel, NULL, &ann->opts);
358 
359                         switch (key) {
360                         case -1:
361                                 if (!ann->skip_missing)
362                                         return;
363                                 /* fall through */
364                         case K_RIGHT:
365                                 next = rb_next(nd);
366                                 break;
367                         case K_LEFT:
368                                 next = rb_prev(nd);
369                                 break;
370                         default:
371                                 return;
372                         }
373 
374                         if (next != NULL)
375                                 nd = next;
376                 } else {
377                         hist_entry__tty_annotate(he, evsel, ann);
378                         nd = rb_next(nd);
379                         /*
380                          * Since we have a hist_entry per IP for the same
381                          * symbol, free he->ms.sym->src to signal we already
382                          * processed this symbol.
383                          */
384                         zfree(&notes->src->cycles_hist);
385                         zfree(&notes->src);
386                 }
387         }
388 }
389 
390 static int __cmd_annotate(struct perf_annotate *ann)
391 {
392         int ret;
393         struct perf_session *session = ann->session;
394         struct evsel *pos;
395         u64 total_nr_samples;
396 
397         if (ann->cpu_list) {
398                 ret = perf_session__cpu_bitmap(session, ann->cpu_list,
399                                                ann->cpu_bitmap);
400                 if (ret)
401                         goto out;
402         }
403 
404         if (!ann->opts.objdump_path) {
405                 ret = perf_env__lookup_objdump(&session->header.env,
406                                                &ann->opts.objdump_path);
407                 if (ret)
408                         goto out;
409         }
410 
411         ret = perf_session__process_events(session);
412         if (ret)
413                 goto out;
414 
415         if (dump_trace) {
416                 perf_session__fprintf_nr_events(session, stdout);
417                 perf_evlist__fprintf_nr_events(session->evlist, stdout);
418                 goto out;
419         }
420 
421         if (verbose > 3)
422                 perf_session__fprintf(session, stdout);
423 
424         if (verbose > 2)
425                 perf_session__fprintf_dsos(session, stdout);
426 
427         total_nr_samples = 0;
428         evlist__for_each_entry(session->evlist, pos) {
429                 struct hists *hists = evsel__hists(pos);
430                 u32 nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];
431 
432                 if (nr_samples > 0) {
433                         total_nr_samples += nr_samples;
434                         hists__collapse_resort(hists, NULL);
435                         /* Don't sort callchain */
436                         perf_evsel__reset_sample_bit(pos, CALLCHAIN);
437                         perf_evsel__output_resort(pos, NULL);
438 
439                         if (symbol_conf.event_group &&
440                             !perf_evsel__is_group_leader(pos))
441                                 continue;
442 
443                         hists__find_annotations(hists, pos, ann);
444                 }
445         }
446 
447         if (total_nr_samples == 0) {
448                 ui__error("The %s data has no samples!\n", session->data->path);
449                 goto out;
450         }
451 
452         if (use_browser == 2) {
453                 void (*show_annotations)(void);
454 
455                 show_annotations = dlsym(perf_gtk_handle,
456                                          "perf_gtk__show_annotations");
457                 if (show_annotations == NULL) {
458                         ui__error("GTK browser not found!\n");
459                         goto out;
460                 }
461                 show_annotations();
462         }
463 
464 out:
465         return ret;
466 }
467 
468 static const char * const annotate_usage[] = {
469         "perf annotate [<options>]",
470         NULL
471 };
472 
473 int cmd_annotate(int argc, const char **argv)
474 {
475         struct perf_annotate annotate = {
476                 .tool = {
477                         .sample = process_sample_event,
478                         .mmap   = perf_event__process_mmap,
479                         .mmap2  = perf_event__process_mmap2,
480                         .comm   = perf_event__process_comm,
481                         .exit   = perf_event__process_exit,
482                         .fork   = perf_event__process_fork,
483                         .namespaces = perf_event__process_namespaces,
484                         .attr   = perf_event__process_attr,
485                         .build_id = perf_event__process_build_id,
486                         .tracing_data   = perf_event__process_tracing_data,
487                         .feature        = process_feature_event,
488                         .ordered_events = true,
489                         .ordering_requires_timestamps = true,
490                 },
491                 .opts = annotation__default_options,
492         };
493         struct perf_data data = {
494                 .mode  = PERF_DATA_MODE_READ,
495         };
496         struct option options[] = {
497         OPT_STRING('i', "input", &input_name, "file",
498                     "input file name"),
499         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
500                    "only consider symbols in these dsos"),
501         OPT_STRING('s', "symbol", &annotate.sym_hist_filter, "symbol",
502                     "symbol to annotate"),
503         OPT_BOOLEAN('f', "force", &data.force, "don't complain, do it"),
504         OPT_INCR('v', "verbose", &verbose,
505                     "be more verbose (show symbol address, etc)"),
506         OPT_BOOLEAN('q', "quiet", &quiet, "do now show any message"),
507         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
508                     "dump raw trace in ASCII"),
509         OPT_BOOLEAN(0, "gtk", &annotate.use_gtk, "Use the GTK interface"),
510         OPT_BOOLEAN(0, "tui", &annotate.use_tui, "Use the TUI interface"),
511         OPT_BOOLEAN(0, "stdio", &annotate.use_stdio, "Use the stdio interface"),
512         OPT_BOOLEAN(0, "stdio2", &annotate.use_stdio2, "Use the stdio interface"),
513         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
514                     "don't load vmlinux even if found"),
515         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
516                    "file", "vmlinux pathname"),
517         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
518                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
519         OPT_BOOLEAN('l', "print-line", &annotate.opts.print_lines,
520                     "print matching source lines (may be slow)"),
521         OPT_BOOLEAN('P', "full-paths", &annotate.opts.full_path,
522                     "Don't shorten the displayed pathnames"),
523         OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,
524                     "Skip symbols that cannot be annotated"),
525         OPT_BOOLEAN_SET(0, "group", &symbol_conf.event_group,
526                         &annotate.group_set,
527                         "Show event group information together"),
528         OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),
529         OPT_CALLBACK(0, "symfs", NULL, "directory",
530                      "Look for files with symbols relative to this directory",
531                      symbol__config_symfs),
532         OPT_BOOLEAN(0, "source", &annotate.opts.annotate_src,
533                     "Interleave source code with assembly code (default)"),
534         OPT_BOOLEAN(0, "asm-raw", &annotate.opts.show_asm_raw,
535                     "Display raw encoding of assembly instructions (default)"),
536         OPT_STRING('M', "disassembler-style", &annotate.opts.disassembler_style, "disassembler style",
537                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
538         OPT_STRING(0, "objdump", &annotate.opts.objdump_path, "path",
539                    "objdump binary to use for disassembly and annotations"),
540         OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
541                     "Show event group information together"),
542         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
543                     "Show a column with the sum of periods"),
544         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
545                     "Show a column with the number of samples"),
546         OPT_CALLBACK_DEFAULT(0, "stdio-color", NULL, "mode",
547                              "'always' (default), 'never' or 'auto' only applicable to --stdio mode",
548                              stdio__config_color, "always"),
549         OPT_CALLBACK(0, "percent-type", &annotate.opts, "local-period",
550                      "Set percent type local/global-period/hits",
551                      annotate_parse_percent_type),
552 
553         OPT_END()
554         };
555         int ret;
556 
557         set_option_flag(options, 0, "show-total-period", PARSE_OPT_EXCLUSIVE);
558         set_option_flag(options, 0, "show-nr-samples", PARSE_OPT_EXCLUSIVE);
559 
560 
561         ret = hists__init();
562         if (ret < 0)
563                 return ret;
564 
565         argc = parse_options(argc, argv, options, annotate_usage, 0);
566         if (argc) {
567                 /*
568                  * Special case: if there's an argument left then assume that
569                  * it's a symbol filter:
570                  */
571                 if (argc > 1)
572                         usage_with_options(annotate_usage, options);
573 
574                 annotate.sym_hist_filter = argv[0];
575         }
576 
577         if (symbol_conf.show_nr_samples && annotate.use_gtk) {
578                 pr_err("--show-nr-samples is not available in --gtk mode at this time\n");
579                 return ret;
580         }
581 
582         if (quiet)
583                 perf_quiet_option();
584 
585         data.path = input_name;
586 
587         annotate.session = perf_session__new(&data, false, &annotate.tool);
588         if (IS_ERR(annotate.session))
589                 return PTR_ERR(annotate.session);
590 
591         annotate.has_br_stack = perf_header__has_feat(&annotate.session->header,
592                                                       HEADER_BRANCH_STACK);
593 
594         if (annotate.group_set)
595                 perf_evlist__force_leader(annotate.session->evlist);
596 
597         ret = symbol__annotation_init();
598         if (ret < 0)
599                 goto out_delete;
600 
601         annotation_config__init();
602 
603         symbol_conf.try_vmlinux_path = true;
604 
605         ret = symbol__init(&annotate.session->header.env);
606         if (ret < 0)
607                 goto out_delete;
608 
609         if (annotate.use_stdio || annotate.use_stdio2)
610                 use_browser = 0;
611         else if (annotate.use_tui)
612                 use_browser = 1;
613         else if (annotate.use_gtk)
614                 use_browser = 2;
615 
616         setup_browser(true);
617 
618         if ((use_browser == 1 || annotate.use_stdio2) && annotate.has_br_stack) {
619                 sort__mode = SORT_MODE__BRANCH;
620                 if (setup_sorting(annotate.session->evlist) < 0)
621                         usage_with_options(annotate_usage, options);
622         } else {
623                 if (setup_sorting(NULL) < 0)
624                         usage_with_options(annotate_usage, options);
625         }
626 
627         ret = __cmd_annotate(&annotate);
628 
629 out_delete:
630         /*
631          * Speed up the exit process, for large files this can
632          * take quite a while.
633          *
634          * XXX Enable this when using valgrind or if we ever
635          * librarize this command.
636          *
637          * Also experiment with obstacks to see how much speed
638          * up we'll get here.
639          *
640          * perf_session__delete(session);
641          */
642         return ret;
643 }
644 

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