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 #ifdef HAVE_SLANG_SUPPORT
50 bool use_tui;
51 #endif
52 bool use_stdio, use_stdio2;
53 #ifdef HAVE_GTK2_SUPPORT
54 bool use_gtk;
55 #endif
56 bool skip_missing;
57 bool has_br_stack;
58 bool group_set;
59 float min_percent;
60 const char *sym_hist_filter;
61 const char *cpu_list;
62 DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
63 };
64
65 /*
66 * Given one basic block:
67 *
68 * from to branch_i
69 * * ----> *
70 * |
71 * | block
72 * v
73 * * ----> *
74 * from to branch_i+1
75 *
76 * where the horizontal are the branches and the vertical is the executed
77 * block of instructions.
78 *
79 * We count, for each 'instruction', the number of blocks that covered it as
80 * well as count the ratio each branch is taken.
81 *
82 * We can do this without knowing the actual instruction stream by keeping
83 * track of the address ranges. We break down ranges such that there is no
84 * overlap and iterate from the start until the end.
85 *
86 * @acme: once we parse the objdump output _before_ processing the samples,
87 * we can easily fold the branch.cycles IPC bits in.
88 */
process_basic_block(struct addr_map_symbol * start,struct addr_map_symbol * end,struct branch_flags * flags)89 static void process_basic_block(struct addr_map_symbol *start,
90 struct addr_map_symbol *end,
91 struct branch_flags *flags)
92 {
93 struct symbol *sym = start->ms.sym;
94 struct annotation *notes = sym ? symbol__annotation(sym) : NULL;
95 struct block_range_iter iter;
96 struct block_range *entry;
97
98 /*
99 * Sanity; NULL isn't executable and the CPU cannot execute backwards
100 */
101 if (!start->addr || start->addr > end->addr)
102 return;
103
104 iter = block_range__create(start->addr, end->addr);
105 if (!block_range_iter__valid(&iter))
106 return;
107
108 /*
109 * First block in range is a branch target.
110 */
111 entry = block_range_iter(&iter);
112 assert(entry->is_target);
113 entry->entry++;
114
115 do {
116 entry = block_range_iter(&iter);
117
118 entry->coverage++;
119 entry->sym = sym;
120
121 if (notes)
122 notes->max_coverage = max(notes->max_coverage, entry->coverage);
123
124 } while (block_range_iter__next(&iter));
125
126 /*
127 * Last block in rage is a branch.
128 */
129 entry = block_range_iter(&iter);
130 assert(entry->is_branch);
131 entry->taken++;
132 if (flags->predicted)
133 entry->pred++;
134 }
135
process_branch_stack(struct branch_stack * bs,struct addr_location * al,struct perf_sample * sample)136 static void process_branch_stack(struct branch_stack *bs, struct addr_location *al,
137 struct perf_sample *sample)
138 {
139 struct addr_map_symbol *prev = NULL;
140 struct branch_info *bi;
141 int i;
142
143 if (!bs || !bs->nr)
144 return;
145
146 bi = sample__resolve_bstack(sample, al);
147 if (!bi)
148 return;
149
150 for (i = bs->nr - 1; i >= 0; i--) {
151 /*
152 * XXX filter against symbol
153 */
154 if (prev)
155 process_basic_block(prev, &bi[i].from, &bi[i].flags);
156 prev = &bi[i].to;
157 }
158
159 free(bi);
160 }
161
hist_iter__branch_callback(struct hist_entry_iter * iter,struct addr_location * al __maybe_unused,bool single __maybe_unused,void * arg __maybe_unused)162 static int hist_iter__branch_callback(struct hist_entry_iter *iter,
163 struct addr_location *al __maybe_unused,
164 bool single __maybe_unused,
165 void *arg __maybe_unused)
166 {
167 struct hist_entry *he = iter->he;
168 struct branch_info *bi;
169 struct perf_sample *sample = iter->sample;
170 struct evsel *evsel = iter->evsel;
171 int err;
172
173 bi = he->branch_info;
174 err = addr_map_symbol__inc_samples(&bi->from, sample, evsel);
175
176 if (err)
177 goto out;
178
179 err = addr_map_symbol__inc_samples(&bi->to, sample, evsel);
180
181 out:
182 return err;
183 }
184
process_branch_callback(struct evsel * evsel,struct perf_sample * sample,struct addr_location * al __maybe_unused,struct perf_annotate * ann,struct machine * machine)185 static int process_branch_callback(struct evsel *evsel,
186 struct perf_sample *sample,
187 struct addr_location *al __maybe_unused,
188 struct perf_annotate *ann,
189 struct machine *machine)
190 {
191 struct hist_entry_iter iter = {
192 .evsel = evsel,
193 .sample = sample,
194 .add_entry_cb = hist_iter__branch_callback,
195 .hide_unresolved = symbol_conf.hide_unresolved,
196 .ops = &hist_iter_branch,
197 };
198
199 struct addr_location a;
200
201 if (machine__resolve(machine, &a, sample) < 0)
202 return -1;
203
204 if (a.sym == NULL)
205 return 0;
206
207 if (a.map != NULL)
208 a.map->dso->hit = 1;
209
210 hist__account_cycles(sample->branch_stack, al, sample, false, NULL);
211
212 return hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
213 }
214
has_annotation(struct perf_annotate * ann)215 static bool has_annotation(struct perf_annotate *ann)
216 {
217 return ui__has_annotation() || ann->use_stdio2;
218 }
219
evsel__add_sample(struct evsel * evsel,struct perf_sample * sample,struct addr_location * al,struct perf_annotate * ann,struct machine * machine)220 static int evsel__add_sample(struct evsel *evsel, struct perf_sample *sample,
221 struct addr_location *al, struct perf_annotate *ann,
222 struct machine *machine)
223 {
224 struct hists *hists = evsel__hists(evsel);
225 struct hist_entry *he;
226 int ret;
227
228 if ((!ann->has_br_stack || !has_annotation(ann)) &&
229 ann->sym_hist_filter != NULL &&
230 (al->sym == NULL ||
231 strcmp(ann->sym_hist_filter, al->sym->name) != 0)) {
232 /* We're only interested in a symbol named sym_hist_filter */
233 /*
234 * FIXME: why isn't this done in the symbol_filter when loading
235 * the DSO?
236 */
237 if (al->sym != NULL) {
238 rb_erase_cached(&al->sym->rb_node,
239 &al->map->dso->symbols);
240 symbol__delete(al->sym);
241 dso__reset_find_symbol_cache(al->map->dso);
242 }
243 return 0;
244 }
245
246 /*
247 * XXX filtered samples can still have branch entries pointing into our
248 * symbol and are missed.
249 */
250 process_branch_stack(sample->branch_stack, al, sample);
251
252 if (ann->has_br_stack && has_annotation(ann))
253 return process_branch_callback(evsel, sample, al, ann, machine);
254
255 he = hists__add_entry(hists, al, NULL, NULL, NULL, sample, true);
256 if (he == NULL)
257 return -ENOMEM;
258
259 ret = hist_entry__inc_addr_samples(he, sample, evsel, al->addr);
260 hists__inc_nr_samples(hists, true);
261 return ret;
262 }
263
process_sample_event(struct perf_tool * tool,union perf_event * event,struct perf_sample * sample,struct evsel * evsel,struct machine * machine)264 static int process_sample_event(struct perf_tool *tool,
265 union perf_event *event,
266 struct perf_sample *sample,
267 struct evsel *evsel,
268 struct machine *machine)
269 {
270 struct perf_annotate *ann = container_of(tool, struct perf_annotate, tool);
271 struct addr_location al;
272 int ret = 0;
273
274 if (machine__resolve(machine, &al, sample) < 0) {
275 pr_warning("problem processing %d event, skipping it.\n",
276 event->header.type);
277 return -1;
278 }
279
280 if (ann->cpu_list && !test_bit(sample->cpu, ann->cpu_bitmap))
281 goto out_put;
282
283 if (!al.filtered &&
284 evsel__add_sample(evsel, sample, &al, ann, machine)) {
285 pr_warning("problem incrementing symbol count, "
286 "skipping event\n");
287 ret = -1;
288 }
289 out_put:
290 addr_location__put(&al);
291 return ret;
292 }
293
process_feature_event(struct perf_session * session,union perf_event * event)294 static int process_feature_event(struct perf_session *session,
295 union perf_event *event)
296 {
297 if (event->feat.feat_id < HEADER_LAST_FEATURE)
298 return perf_event__process_feature(session, event);
299 return 0;
300 }
301
hist_entry__tty_annotate(struct hist_entry * he,struct evsel * evsel,struct perf_annotate * ann)302 static int hist_entry__tty_annotate(struct hist_entry *he,
303 struct evsel *evsel,
304 struct perf_annotate *ann)
305 {
306 if (!ann->use_stdio2)
307 return symbol__tty_annotate(&he->ms, evsel, &ann->opts);
308
309 return symbol__tty_annotate2(&he->ms, evsel, &ann->opts);
310 }
311
hists__find_annotations(struct hists * hists,struct evsel * evsel,struct perf_annotate * ann)312 static void hists__find_annotations(struct hists *hists,
313 struct evsel *evsel,
314 struct perf_annotate *ann)
315 {
316 struct rb_node *nd = rb_first_cached(&hists->entries), *next;
317 int key = K_RIGHT;
318
319 while (nd) {
320 struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
321 struct annotation *notes;
322
323 if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
324 goto find_next;
325
326 if (ann->sym_hist_filter &&
327 (strcmp(he->ms.sym->name, ann->sym_hist_filter) != 0))
328 goto find_next;
329
330 if (ann->min_percent) {
331 float percent = 0;
332 u64 total = hists__total_period(hists);
333
334 if (total)
335 percent = 100.0 * he->stat.period / total;
336
337 if (percent < ann->min_percent)
338 goto find_next;
339 }
340
341 notes = symbol__annotation(he->ms.sym);
342 if (notes->src == NULL) {
343 find_next:
344 if (key == K_LEFT)
345 nd = rb_prev(nd);
346 else
347 nd = rb_next(nd);
348 continue;
349 }
350
351 if (use_browser == 2) {
352 int ret;
353 int (*annotate)(struct hist_entry *he,
354 struct evsel *evsel,
355 struct hist_browser_timer *hbt);
356
357 annotate = dlsym(perf_gtk_handle,
358 "hist_entry__gtk_annotate");
359 if (annotate == NULL) {
360 ui__error("GTK browser not found!\n");
361 return;
362 }
363
364 ret = annotate(he, evsel, NULL);
365 if (!ret || !ann->skip_missing)
366 return;
367
368 /* skip missing symbols */
369 nd = rb_next(nd);
370 } else if (use_browser == 1) {
371 key = hist_entry__tui_annotate(he, evsel, NULL, &ann->opts);
372
373 switch (key) {
374 case -1:
375 if (!ann->skip_missing)
376 return;
377 /* fall through */
378 case K_RIGHT:
379 next = rb_next(nd);
380 break;
381 case K_LEFT:
382 next = rb_prev(nd);
383 break;
384 default:
385 return;
386 }
387
388 if (next != NULL)
389 nd = next;
390 } else {
391 hist_entry__tty_annotate(he, evsel, ann);
392 nd = rb_next(nd);
393 }
394 }
395 }
396
__cmd_annotate(struct perf_annotate * ann)397 static int __cmd_annotate(struct perf_annotate *ann)
398 {
399 int ret;
400 struct perf_session *session = ann->session;
401 struct evsel *pos;
402 u64 total_nr_samples;
403
404 if (ann->cpu_list) {
405 ret = perf_session__cpu_bitmap(session, ann->cpu_list,
406 ann->cpu_bitmap);
407 if (ret)
408 goto out;
409 }
410
411 if (!ann->opts.objdump_path) {
412 ret = perf_env__lookup_objdump(&session->header.env,
413 &ann->opts.objdump_path);
414 if (ret)
415 goto out;
416 }
417
418 ret = perf_session__process_events(session);
419 if (ret)
420 goto out;
421
422 if (dump_trace) {
423 perf_session__fprintf_nr_events(session, stdout, false);
424 evlist__fprintf_nr_events(session->evlist, stdout, false);
425 goto out;
426 }
427
428 if (verbose > 3)
429 perf_session__fprintf(session, stdout);
430
431 if (verbose > 2)
432 perf_session__fprintf_dsos(session, stdout);
433
434 total_nr_samples = 0;
435 evlist__for_each_entry(session->evlist, pos) {
436 struct hists *hists = evsel__hists(pos);
437 u32 nr_samples = hists->stats.nr_samples;
438
439 if (nr_samples > 0) {
440 total_nr_samples += nr_samples;
441 hists__collapse_resort(hists, NULL);
442 /* Don't sort callchain */
443 evsel__reset_sample_bit(pos, CALLCHAIN);
444 evsel__output_resort(pos, NULL);
445
446 if (symbol_conf.event_group && !evsel__is_group_leader(pos))
447 continue;
448
449 hists__find_annotations(hists, pos, ann);
450 }
451 }
452
453 if (total_nr_samples == 0) {
454 ui__error("The %s data has no samples!\n", session->data->path);
455 goto out;
456 }
457
458 if (use_browser == 2) {
459 void (*show_annotations)(void);
460
461 show_annotations = dlsym(perf_gtk_handle,
462 "perf_gtk__show_annotations");
463 if (show_annotations == NULL) {
464 ui__error("GTK browser not found!\n");
465 goto out;
466 }
467 show_annotations();
468 }
469
470 out:
471 return ret;
472 }
473
parse_percent_limit(const struct option * opt,const char * str,int unset __maybe_unused)474 static int parse_percent_limit(const struct option *opt, const char *str,
475 int unset __maybe_unused)
476 {
477 struct perf_annotate *ann = opt->value;
478 double pcnt = strtof(str, NULL);
479
480 ann->min_percent = pcnt;
481 return 0;
482 }
483
484 static const char * const annotate_usage[] = {
485 "perf annotate [<options>]",
486 NULL
487 };
488
cmd_annotate(int argc,const char ** argv)489 int cmd_annotate(int argc, const char **argv)
490 {
491 struct perf_annotate annotate = {
492 .tool = {
493 .sample = process_sample_event,
494 .mmap = perf_event__process_mmap,
495 .mmap2 = perf_event__process_mmap2,
496 .comm = perf_event__process_comm,
497 .exit = perf_event__process_exit,
498 .fork = perf_event__process_fork,
499 .namespaces = perf_event__process_namespaces,
500 .attr = perf_event__process_attr,
501 .build_id = perf_event__process_build_id,
502 .tracing_data = perf_event__process_tracing_data,
503 .id_index = perf_event__process_id_index,
504 .auxtrace_info = perf_event__process_auxtrace_info,
505 .auxtrace = perf_event__process_auxtrace,
506 .feature = process_feature_event,
507 .ordered_events = true,
508 .ordering_requires_timestamps = true,
509 },
510 .opts = annotation__default_options,
511 };
512 struct perf_data data = {
513 .mode = PERF_DATA_MODE_READ,
514 };
515 struct itrace_synth_opts itrace_synth_opts = {
516 .set = 0,
517 };
518 struct option options[] = {
519 OPT_STRING('i', "input", &input_name, "file",
520 "input file name"),
521 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
522 "only consider symbols in these dsos"),
523 OPT_STRING('s', "symbol", &annotate.sym_hist_filter, "symbol",
524 "symbol to annotate"),
525 OPT_BOOLEAN('f', "force", &data.force, "don't complain, do it"),
526 OPT_INCR('v', "verbose", &verbose,
527 "be more verbose (show symbol address, etc)"),
528 OPT_BOOLEAN('q', "quiet", &quiet, "do now show any warnings or messages"),
529 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
530 "dump raw trace in ASCII"),
531 #ifdef HAVE_GTK2_SUPPORT
532 OPT_BOOLEAN(0, "gtk", &annotate.use_gtk, "Use the GTK interface"),
533 #endif
534 #ifdef HAVE_SLANG_SUPPORT
535 OPT_BOOLEAN(0, "tui", &annotate.use_tui, "Use the TUI interface"),
536 #endif
537 OPT_BOOLEAN(0, "stdio", &annotate.use_stdio, "Use the stdio interface"),
538 OPT_BOOLEAN(0, "stdio2", &annotate.use_stdio2, "Use the stdio interface"),
539 OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
540 "don't load vmlinux even if found"),
541 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
542 "file", "vmlinux pathname"),
543 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
544 "load module symbols - WARNING: use only with -k and LIVE kernel"),
545 OPT_BOOLEAN('l', "print-line", &annotate.opts.print_lines,
546 "print matching source lines (may be slow)"),
547 OPT_BOOLEAN('P', "full-paths", &annotate.opts.full_path,
548 "Don't shorten the displayed pathnames"),
549 OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,
550 "Skip symbols that cannot be annotated"),
551 OPT_BOOLEAN_SET(0, "group", &symbol_conf.event_group,
552 &annotate.group_set,
553 "Show event group information together"),
554 OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),
555 OPT_CALLBACK(0, "symfs", NULL, "directory",
556 "Look for files with symbols relative to this directory",
557 symbol__config_symfs),
558 OPT_BOOLEAN(0, "source", &annotate.opts.annotate_src,
559 "Interleave source code with assembly code (default)"),
560 OPT_BOOLEAN(0, "asm-raw", &annotate.opts.show_asm_raw,
561 "Display raw encoding of assembly instructions (default)"),
562 OPT_STRING('M', "disassembler-style", &annotate.opts.disassembler_style, "disassembler style",
563 "Specify disassembler style (e.g. -M intel for intel syntax)"),
564 OPT_STRING(0, "prefix", &annotate.opts.prefix, "prefix",
565 "Add prefix to source file path names in programs (with --prefix-strip)"),
566 OPT_STRING(0, "prefix-strip", &annotate.opts.prefix_strip, "N",
567 "Strip first N entries of source file path name in programs (with --prefix)"),
568 OPT_STRING(0, "objdump", &annotate.opts.objdump_path, "path",
569 "objdump binary to use for disassembly and annotations"),
570 OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
571 "Enable symbol demangling"),
572 OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
573 "Enable kernel symbol demangling"),
574 OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
575 "Show event group information together"),
576 OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
577 "Show a column with the sum of periods"),
578 OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
579 "Show a column with the number of samples"),
580 OPT_CALLBACK_DEFAULT(0, "stdio-color", NULL, "mode",
581 "'always' (default), 'never' or 'auto' only applicable to --stdio mode",
582 stdio__config_color, "always"),
583 OPT_CALLBACK(0, "percent-type", &annotate.opts, "local-period",
584 "Set percent type local/global-period/hits",
585 annotate_parse_percent_type),
586 OPT_CALLBACK(0, "percent-limit", &annotate, "percent",
587 "Don't show entries under that percent", parse_percent_limit),
588 OPT_CALLBACK_OPTARG(0, "itrace", &itrace_synth_opts, NULL, "opts",
589 "Instruction Tracing options\n" ITRACE_HELP,
590 itrace_parse_synth_opts),
591
592 OPT_END()
593 };
594 int ret;
595
596 set_option_flag(options, 0, "show-total-period", PARSE_OPT_EXCLUSIVE);
597 set_option_flag(options, 0, "show-nr-samples", PARSE_OPT_EXCLUSIVE);
598
599
600 ret = hists__init();
601 if (ret < 0)
602 return ret;
603
604 annotation_config__init(&annotate.opts);
605
606 argc = parse_options(argc, argv, options, annotate_usage, 0);
607 if (argc) {
608 /*
609 * Special case: if there's an argument left then assume that
610 * it's a symbol filter:
611 */
612 if (argc > 1)
613 usage_with_options(annotate_usage, options);
614
615 annotate.sym_hist_filter = argv[0];
616 }
617
618 if (annotate_check_args(&annotate.opts) < 0)
619 return -EINVAL;
620
621 #ifdef HAVE_GTK2_SUPPORT
622 if (symbol_conf.show_nr_samples && annotate.use_gtk) {
623 pr_err("--show-nr-samples is not available in --gtk mode at this time\n");
624 return ret;
625 }
626 #endif
627
628 ret = symbol__validate_sym_arguments();
629 if (ret)
630 return ret;
631
632 if (quiet)
633 perf_quiet_option();
634
635 data.path = input_name;
636
637 annotate.session = perf_session__new(&data, &annotate.tool);
638 if (IS_ERR(annotate.session))
639 return PTR_ERR(annotate.session);
640
641 annotate.session->itrace_synth_opts = &itrace_synth_opts;
642
643 annotate.has_br_stack = perf_header__has_feat(&annotate.session->header,
644 HEADER_BRANCH_STACK);
645
646 if (annotate.group_set)
647 evlist__force_leader(annotate.session->evlist);
648
649 ret = symbol__annotation_init();
650 if (ret < 0)
651 goto out_delete;
652
653 symbol_conf.try_vmlinux_path = true;
654
655 ret = symbol__init(&annotate.session->header.env);
656 if (ret < 0)
657 goto out_delete;
658
659 if (annotate.use_stdio || annotate.use_stdio2)
660 use_browser = 0;
661 #ifdef HAVE_SLANG_SUPPORT
662 else if (annotate.use_tui)
663 use_browser = 1;
664 #endif
665 #ifdef HAVE_GTK2_SUPPORT
666 else if (annotate.use_gtk)
667 use_browser = 2;
668 #endif
669
670 setup_browser(true);
671
672 /*
673 * Events of different processes may correspond to the same
674 * symbol, we do not care about the processes in annotate,
675 * set sort order to avoid repeated output.
676 */
677 sort_order = "dso,symbol";
678
679 /*
680 * Set SORT_MODE__BRANCH so that annotate display IPC/Cycle
681 * if branch info is in perf data in TUI mode.
682 */
683 if ((use_browser == 1 || annotate.use_stdio2) && annotate.has_br_stack)
684 sort__mode = SORT_MODE__BRANCH;
685
686 if (setup_sorting(NULL) < 0)
687 usage_with_options(annotate_usage, options);
688
689 ret = __cmd_annotate(&annotate);
690
691 out_delete:
692 /*
693 * Speed up the exit process, for large files this can
694 * take quite a while.
695 *
696 * XXX Enable this when using valgrind or if we ever
697 * librarize this command.
698 *
699 * Also experiment with obstacks to see how much speed
700 * up we'll get here.
701 *
702 * perf_session__delete(session);
703 */
704 return ret;
705 }
706