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13#include <inttypes.h>
14#include <stdlib.h>
15#include <stdio.h>
16#include <stdbool.h>
17#include <errno.h>
18#include <math.h>
19#include <linux/string.h>
20#include <linux/zalloc.h>
21
22#include "asm/bug.h"
23
24#include "debug.h"
25#include "dso.h"
26#include "event.h"
27#include "hist.h"
28#include "sort.h"
29#include "machine.h"
30#include "map.h"
31#include "callchain.h"
32#include "branch.h"
33#include "symbol.h"
34#include "../perf.h"
35
36#define CALLCHAIN_PARAM_DEFAULT \
37 .mode = CHAIN_GRAPH_ABS, \
38 .min_percent = 0.5, \
39 .order = ORDER_CALLEE, \
40 .key = CCKEY_FUNCTION, \
41 .value = CCVAL_PERCENT, \
42
43struct callchain_param callchain_param = {
44 CALLCHAIN_PARAM_DEFAULT
45};
46
47
48
49
50
51
52
53
54bool dwarf_callchain_users;
55
56struct callchain_param callchain_param_default = {
57 CALLCHAIN_PARAM_DEFAULT
58};
59
60__thread struct callchain_cursor callchain_cursor;
61
62int parse_callchain_record_opt(const char *arg, struct callchain_param *param)
63{
64 return parse_callchain_record(arg, param);
65}
66
67static int parse_callchain_mode(const char *value)
68{
69 if (!strncmp(value, "graph", strlen(value))) {
70 callchain_param.mode = CHAIN_GRAPH_ABS;
71 return 0;
72 }
73 if (!strncmp(value, "flat", strlen(value))) {
74 callchain_param.mode = CHAIN_FLAT;
75 return 0;
76 }
77 if (!strncmp(value, "fractal", strlen(value))) {
78 callchain_param.mode = CHAIN_GRAPH_REL;
79 return 0;
80 }
81 if (!strncmp(value, "folded", strlen(value))) {
82 callchain_param.mode = CHAIN_FOLDED;
83 return 0;
84 }
85 return -1;
86}
87
88static int parse_callchain_order(const char *value)
89{
90 if (!strncmp(value, "caller", strlen(value))) {
91 callchain_param.order = ORDER_CALLER;
92 callchain_param.order_set = true;
93 return 0;
94 }
95 if (!strncmp(value, "callee", strlen(value))) {
96 callchain_param.order = ORDER_CALLEE;
97 callchain_param.order_set = true;
98 return 0;
99 }
100 return -1;
101}
102
103static int parse_callchain_sort_key(const char *value)
104{
105 if (!strncmp(value, "function", strlen(value))) {
106 callchain_param.key = CCKEY_FUNCTION;
107 return 0;
108 }
109 if (!strncmp(value, "address", strlen(value))) {
110 callchain_param.key = CCKEY_ADDRESS;
111 return 0;
112 }
113 if (!strncmp(value, "srcline", strlen(value))) {
114 callchain_param.key = CCKEY_SRCLINE;
115 return 0;
116 }
117 if (!strncmp(value, "branch", strlen(value))) {
118 callchain_param.branch_callstack = 1;
119 return 0;
120 }
121 return -1;
122}
123
124static int parse_callchain_value(const char *value)
125{
126 if (!strncmp(value, "percent", strlen(value))) {
127 callchain_param.value = CCVAL_PERCENT;
128 return 0;
129 }
130 if (!strncmp(value, "period", strlen(value))) {
131 callchain_param.value = CCVAL_PERIOD;
132 return 0;
133 }
134 if (!strncmp(value, "count", strlen(value))) {
135 callchain_param.value = CCVAL_COUNT;
136 return 0;
137 }
138 return -1;
139}
140
141static int get_stack_size(const char *str, unsigned long *_size)
142{
143 char *endptr;
144 unsigned long size;
145 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
146
147 size = strtoul(str, &endptr, 0);
148
149 do {
150 if (*endptr)
151 break;
152
153 size = round_up(size, sizeof(u64));
154 if (!size || size > max_size)
155 break;
156
157 *_size = size;
158 return 0;
159
160 } while (0);
161
162 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
163 max_size, str);
164 return -1;
165}
166
167static int
168__parse_callchain_report_opt(const char *arg, bool allow_record_opt)
169{
170 char *tok;
171 char *endptr, *saveptr = NULL;
172 bool minpcnt_set = false;
173 bool record_opt_set = false;
174 bool try_stack_size = false;
175
176 callchain_param.enabled = true;
177 symbol_conf.use_callchain = true;
178
179 if (!arg)
180 return 0;
181
182 while ((tok = strtok_r((char *)arg, ",", &saveptr)) != NULL) {
183 if (!strncmp(tok, "none", strlen(tok))) {
184 callchain_param.mode = CHAIN_NONE;
185 callchain_param.enabled = false;
186 symbol_conf.use_callchain = false;
187 return 0;
188 }
189
190 if (!parse_callchain_mode(tok) ||
191 !parse_callchain_order(tok) ||
192 !parse_callchain_sort_key(tok) ||
193 !parse_callchain_value(tok)) {
194
195 try_stack_size = false;
196 goto next;
197 } else if (allow_record_opt && !record_opt_set) {
198 if (parse_callchain_record(tok, &callchain_param))
199 goto try_numbers;
200
201
202 if (callchain_param.record_mode == CALLCHAIN_DWARF)
203 try_stack_size = true;
204
205 record_opt_set = true;
206 goto next;
207 }
208
209try_numbers:
210 if (try_stack_size) {
211 unsigned long size = 0;
212
213 if (get_stack_size(tok, &size) < 0)
214 return -1;
215 callchain_param.dump_size = size;
216 try_stack_size = false;
217 } else if (!minpcnt_set) {
218
219 callchain_param.min_percent = strtod(tok, &endptr);
220 if (tok == endptr)
221 return -1;
222 minpcnt_set = true;
223 } else {
224
225 callchain_param.print_limit = strtoul(tok, &endptr, 0);
226 if (tok == endptr)
227 return -1;
228 }
229next:
230 arg = NULL;
231 }
232
233 if (callchain_register_param(&callchain_param) < 0) {
234 pr_err("Can't register callchain params\n");
235 return -1;
236 }
237 return 0;
238}
239
240int parse_callchain_report_opt(const char *arg)
241{
242 return __parse_callchain_report_opt(arg, false);
243}
244
245int parse_callchain_top_opt(const char *arg)
246{
247 return __parse_callchain_report_opt(arg, true);
248}
249
250int parse_callchain_record(const char *arg, struct callchain_param *param)
251{
252 char *tok, *name, *saveptr = NULL;
253 char *buf;
254 int ret = -1;
255
256
257 buf = malloc(strlen(arg) + 1);
258 if (!buf)
259 return -ENOMEM;
260
261 strcpy(buf, arg);
262
263 tok = strtok_r((char *)buf, ",", &saveptr);
264 name = tok ? : (char *)buf;
265
266 do {
267
268 if (!strncmp(name, "fp", sizeof("fp"))) {
269 if (!strtok_r(NULL, ",", &saveptr)) {
270 param->record_mode = CALLCHAIN_FP;
271 ret = 0;
272 } else
273 pr_err("callchain: No more arguments "
274 "needed for --call-graph fp\n");
275 break;
276
277
278 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
279 const unsigned long default_stack_dump_size = 8192;
280
281 ret = 0;
282 param->record_mode = CALLCHAIN_DWARF;
283 param->dump_size = default_stack_dump_size;
284 dwarf_callchain_users = true;
285
286 tok = strtok_r(NULL, ",", &saveptr);
287 if (tok) {
288 unsigned long size = 0;
289
290 ret = get_stack_size(tok, &size);
291 param->dump_size = size;
292 }
293 } else if (!strncmp(name, "lbr", sizeof("lbr"))) {
294 if (!strtok_r(NULL, ",", &saveptr)) {
295 param->record_mode = CALLCHAIN_LBR;
296 ret = 0;
297 } else
298 pr_err("callchain: No more arguments "
299 "needed for --call-graph lbr\n");
300 break;
301 } else {
302 pr_err("callchain: Unknown --call-graph option "
303 "value: %s\n", arg);
304 break;
305 }
306
307 } while (0);
308
309 free(buf);
310 return ret;
311}
312
313int perf_callchain_config(const char *var, const char *value)
314{
315 char *endptr;
316
317 if (!strstarts(var, "call-graph."))
318 return 0;
319 var += sizeof("call-graph.") - 1;
320
321 if (!strcmp(var, "record-mode"))
322 return parse_callchain_record_opt(value, &callchain_param);
323 if (!strcmp(var, "dump-size")) {
324 unsigned long size = 0;
325 int ret;
326
327 ret = get_stack_size(value, &size);
328 callchain_param.dump_size = size;
329
330 return ret;
331 }
332 if (!strcmp(var, "print-type")){
333 int ret;
334 ret = parse_callchain_mode(value);
335 if (ret == -1)
336 pr_err("Invalid callchain mode: %s\n", value);
337 return ret;
338 }
339 if (!strcmp(var, "order")){
340 int ret;
341 ret = parse_callchain_order(value);
342 if (ret == -1)
343 pr_err("Invalid callchain order: %s\n", value);
344 return ret;
345 }
346 if (!strcmp(var, "sort-key")){
347 int ret;
348 ret = parse_callchain_sort_key(value);
349 if (ret == -1)
350 pr_err("Invalid callchain sort key: %s\n", value);
351 return ret;
352 }
353 if (!strcmp(var, "threshold")) {
354 callchain_param.min_percent = strtod(value, &endptr);
355 if (value == endptr) {
356 pr_err("Invalid callchain threshold: %s\n", value);
357 return -1;
358 }
359 }
360 if (!strcmp(var, "print-limit")) {
361 callchain_param.print_limit = strtod(value, &endptr);
362 if (value == endptr) {
363 pr_err("Invalid callchain print limit: %s\n", value);
364 return -1;
365 }
366 }
367
368 return 0;
369}
370
371static void
372rb_insert_callchain(struct rb_root *root, struct callchain_node *chain,
373 enum chain_mode mode)
374{
375 struct rb_node **p = &root->rb_node;
376 struct rb_node *parent = NULL;
377 struct callchain_node *rnode;
378 u64 chain_cumul = callchain_cumul_hits(chain);
379
380 while (*p) {
381 u64 rnode_cumul;
382
383 parent = *p;
384 rnode = rb_entry(parent, struct callchain_node, rb_node);
385 rnode_cumul = callchain_cumul_hits(rnode);
386
387 switch (mode) {
388 case CHAIN_FLAT:
389 case CHAIN_FOLDED:
390 if (rnode->hit < chain->hit)
391 p = &(*p)->rb_left;
392 else
393 p = &(*p)->rb_right;
394 break;
395 case CHAIN_GRAPH_ABS:
396 case CHAIN_GRAPH_REL:
397 if (rnode_cumul < chain_cumul)
398 p = &(*p)->rb_left;
399 else
400 p = &(*p)->rb_right;
401 break;
402 case CHAIN_NONE:
403 default:
404 break;
405 }
406 }
407
408 rb_link_node(&chain->rb_node, parent, p);
409 rb_insert_color(&chain->rb_node, root);
410}
411
412static void
413__sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node,
414 u64 min_hit)
415{
416 struct rb_node *n;
417 struct callchain_node *child;
418
419 n = rb_first(&node->rb_root_in);
420 while (n) {
421 child = rb_entry(n, struct callchain_node, rb_node_in);
422 n = rb_next(n);
423
424 __sort_chain_flat(rb_root, child, min_hit);
425 }
426
427 if (node->hit && node->hit >= min_hit)
428 rb_insert_callchain(rb_root, node, CHAIN_FLAT);
429}
430
431
432
433
434
435static void
436sort_chain_flat(struct rb_root *rb_root, struct callchain_root *root,
437 u64 min_hit, struct callchain_param *param __maybe_unused)
438{
439 *rb_root = RB_ROOT;
440 __sort_chain_flat(rb_root, &root->node, min_hit);
441}
442
443static void __sort_chain_graph_abs(struct callchain_node *node,
444 u64 min_hit)
445{
446 struct rb_node *n;
447 struct callchain_node *child;
448
449 node->rb_root = RB_ROOT;
450 n = rb_first(&node->rb_root_in);
451
452 while (n) {
453 child = rb_entry(n, struct callchain_node, rb_node_in);
454 n = rb_next(n);
455
456 __sort_chain_graph_abs(child, min_hit);
457 if (callchain_cumul_hits(child) >= min_hit)
458 rb_insert_callchain(&node->rb_root, child,
459 CHAIN_GRAPH_ABS);
460 }
461}
462
463static void
464sort_chain_graph_abs(struct rb_root *rb_root, struct callchain_root *chain_root,
465 u64 min_hit, struct callchain_param *param __maybe_unused)
466{
467 __sort_chain_graph_abs(&chain_root->node, min_hit);
468 rb_root->rb_node = chain_root->node.rb_root.rb_node;
469}
470
471static void __sort_chain_graph_rel(struct callchain_node *node,
472 double min_percent)
473{
474 struct rb_node *n;
475 struct callchain_node *child;
476 u64 min_hit;
477
478 node->rb_root = RB_ROOT;
479 min_hit = ceil(node->children_hit * min_percent);
480
481 n = rb_first(&node->rb_root_in);
482 while (n) {
483 child = rb_entry(n, struct callchain_node, rb_node_in);
484 n = rb_next(n);
485
486 __sort_chain_graph_rel(child, min_percent);
487 if (callchain_cumul_hits(child) >= min_hit)
488 rb_insert_callchain(&node->rb_root, child,
489 CHAIN_GRAPH_REL);
490 }
491}
492
493static void
494sort_chain_graph_rel(struct rb_root *rb_root, struct callchain_root *chain_root,
495 u64 min_hit __maybe_unused, struct callchain_param *param)
496{
497 __sort_chain_graph_rel(&chain_root->node, param->min_percent / 100.0);
498 rb_root->rb_node = chain_root->node.rb_root.rb_node;
499}
500
501int callchain_register_param(struct callchain_param *param)
502{
503 switch (param->mode) {
504 case CHAIN_GRAPH_ABS:
505 param->sort = sort_chain_graph_abs;
506 break;
507 case CHAIN_GRAPH_REL:
508 param->sort = sort_chain_graph_rel;
509 break;
510 case CHAIN_FLAT:
511 case CHAIN_FOLDED:
512 param->sort = sort_chain_flat;
513 break;
514 case CHAIN_NONE:
515 default:
516 return -1;
517 }
518 return 0;
519}
520
521
522
523
524
525static struct callchain_node *
526create_child(struct callchain_node *parent, bool inherit_children)
527{
528 struct callchain_node *new;
529
530 new = zalloc(sizeof(*new));
531 if (!new) {
532 perror("not enough memory to create child for code path tree");
533 return NULL;
534 }
535 new->parent = parent;
536 INIT_LIST_HEAD(&new->val);
537 INIT_LIST_HEAD(&new->parent_val);
538
539 if (inherit_children) {
540 struct rb_node *n;
541 struct callchain_node *child;
542
543 new->rb_root_in = parent->rb_root_in;
544 parent->rb_root_in = RB_ROOT;
545
546 n = rb_first(&new->rb_root_in);
547 while (n) {
548 child = rb_entry(n, struct callchain_node, rb_node_in);
549 child->parent = new;
550 n = rb_next(n);
551 }
552
553
554 rb_link_node(&new->rb_node_in, NULL, &parent->rb_root_in.rb_node);
555 rb_insert_color(&new->rb_node_in, &parent->rb_root_in);
556 }
557
558 return new;
559}
560
561
562
563
564
565static int
566fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
567{
568 struct callchain_cursor_node *cursor_node;
569
570 node->val_nr = cursor->nr - cursor->pos;
571 if (!node->val_nr)
572 pr_warning("Warning: empty node in callchain tree\n");
573
574 cursor_node = callchain_cursor_current(cursor);
575
576 while (cursor_node) {
577 struct callchain_list *call;
578
579 call = zalloc(sizeof(*call));
580 if (!call) {
581 perror("not enough memory for the code path tree");
582 return -1;
583 }
584 call->ip = cursor_node->ip;
585 call->ms = cursor_node->ms;
586 map__get(call->ms.map);
587 call->srcline = cursor_node->srcline;
588
589 if (cursor_node->branch) {
590 call->branch_count = 1;
591
592 if (cursor_node->branch_from) {
593
594
595
596
597 call->brtype_stat.branch_to = true;
598
599 if (cursor_node->branch_flags.predicted)
600 call->predicted_count = 1;
601
602 if (cursor_node->branch_flags.abort)
603 call->abort_count = 1;
604
605 branch_type_count(&call->brtype_stat,
606 &cursor_node->branch_flags,
607 cursor_node->branch_from,
608 cursor_node->ip);
609 } else {
610
611
612
613 call->brtype_stat.branch_to = false;
614 call->cycles_count =
615 cursor_node->branch_flags.cycles;
616 call->iter_count = cursor_node->nr_loop_iter;
617 call->iter_cycles = cursor_node->iter_cycles;
618 }
619 }
620
621 list_add_tail(&call->list, &node->val);
622
623 callchain_cursor_advance(cursor);
624 cursor_node = callchain_cursor_current(cursor);
625 }
626 return 0;
627}
628
629static struct callchain_node *
630add_child(struct callchain_node *parent,
631 struct callchain_cursor *cursor,
632 u64 period)
633{
634 struct callchain_node *new;
635
636 new = create_child(parent, false);
637 if (new == NULL)
638 return NULL;
639
640 if (fill_node(new, cursor) < 0) {
641 struct callchain_list *call, *tmp;
642
643 list_for_each_entry_safe(call, tmp, &new->val, list) {
644 list_del_init(&call->list);
645 map__zput(call->ms.map);
646 free(call);
647 }
648 free(new);
649 return NULL;
650 }
651
652 new->children_hit = 0;
653 new->hit = period;
654 new->children_count = 0;
655 new->count = 1;
656 return new;
657}
658
659enum match_result {
660 MATCH_ERROR = -1,
661 MATCH_EQ,
662 MATCH_LT,
663 MATCH_GT,
664};
665
666static enum match_result match_chain_strings(const char *left,
667 const char *right)
668{
669 enum match_result ret = MATCH_EQ;
670 int cmp;
671
672 if (left && right)
673 cmp = strcmp(left, right);
674 else if (!left && right)
675 cmp = 1;
676 else if (left && !right)
677 cmp = -1;
678 else
679 return MATCH_ERROR;
680
681 if (cmp != 0)
682 ret = cmp < 0 ? MATCH_LT : MATCH_GT;
683
684 return ret;
685}
686
687
688
689
690
691
692
693
694
695static enum match_result match_chain_dso_addresses(struct map *left_map, u64 left_ip,
696 struct map *right_map, u64 right_ip)
697{
698 struct dso *left_dso = left_map ? left_map->dso : NULL;
699 struct dso *right_dso = right_map ? right_map->dso : NULL;
700
701 if (left_dso != right_dso)
702 return left_dso < right_dso ? MATCH_LT : MATCH_GT;
703
704 if (left_ip != right_ip)
705 return left_ip < right_ip ? MATCH_LT : MATCH_GT;
706
707 return MATCH_EQ;
708}
709
710static enum match_result match_chain(struct callchain_cursor_node *node,
711 struct callchain_list *cnode)
712{
713 enum match_result match = MATCH_ERROR;
714
715 switch (callchain_param.key) {
716 case CCKEY_SRCLINE:
717 match = match_chain_strings(cnode->srcline, node->srcline);
718 if (match != MATCH_ERROR)
719 break;
720
721 __fallthrough;
722 case CCKEY_FUNCTION:
723 if (node->ms.sym && cnode->ms.sym) {
724
725
726
727
728
729
730 if (cnode->ms.sym->inlined || node->ms.sym->inlined) {
731 match = match_chain_strings(cnode->ms.sym->name,
732 node->ms.sym->name);
733 if (match != MATCH_ERROR)
734 break;
735 } else {
736 match = match_chain_dso_addresses(cnode->ms.map, cnode->ms.sym->start,
737 node->ms.map, node->ms.sym->start);
738 break;
739 }
740 }
741
742 __fallthrough;
743 case CCKEY_ADDRESS:
744 default:
745 match = match_chain_dso_addresses(cnode->ms.map, cnode->ip, node->ms.map, node->ip);
746 break;
747 }
748
749 if (match == MATCH_EQ && node->branch) {
750 cnode->branch_count++;
751
752 if (node->branch_from) {
753
754
755
756 cnode->brtype_stat.branch_to = true;
757
758 if (node->branch_flags.predicted)
759 cnode->predicted_count++;
760
761 if (node->branch_flags.abort)
762 cnode->abort_count++;
763
764 branch_type_count(&cnode->brtype_stat,
765 &node->branch_flags,
766 node->branch_from,
767 node->ip);
768 } else {
769
770
771
772 cnode->brtype_stat.branch_to = false;
773 cnode->cycles_count += node->branch_flags.cycles;
774 cnode->iter_count += node->nr_loop_iter;
775 cnode->iter_cycles += node->iter_cycles;
776 cnode->from_count++;
777 }
778 }
779
780 return match;
781}
782
783
784
785
786
787
788static int
789split_add_child(struct callchain_node *parent,
790 struct callchain_cursor *cursor,
791 struct callchain_list *to_split,
792 u64 idx_parents, u64 idx_local, u64 period)
793{
794 struct callchain_node *new;
795 struct list_head *old_tail;
796 unsigned int idx_total = idx_parents + idx_local;
797
798
799 new = create_child(parent, true);
800 if (new == NULL)
801 return -1;
802
803
804 old_tail = parent->val.prev;
805 list_del_range(&to_split->list, old_tail);
806 new->val.next = &to_split->list;
807 new->val.prev = old_tail;
808 to_split->list.prev = &new->val;
809 old_tail->next = &new->val;
810
811
812 new->hit = parent->hit;
813 new->children_hit = parent->children_hit;
814 parent->children_hit = callchain_cumul_hits(new);
815 new->val_nr = parent->val_nr - idx_local;
816 parent->val_nr = idx_local;
817 new->count = parent->count;
818 new->children_count = parent->children_count;
819 parent->children_count = callchain_cumul_counts(new);
820
821
822 if (idx_total < cursor->nr) {
823 struct callchain_node *first;
824 struct callchain_list *cnode;
825 struct callchain_cursor_node *node;
826 struct rb_node *p, **pp;
827
828 parent->hit = 0;
829 parent->children_hit += period;
830 parent->count = 0;
831 parent->children_count += 1;
832
833 node = callchain_cursor_current(cursor);
834 new = add_child(parent, cursor, period);
835 if (new == NULL)
836 return -1;
837
838
839
840
841
842 p = parent->rb_root_in.rb_node;
843 first = rb_entry(p, struct callchain_node, rb_node_in);
844 cnode = list_first_entry(&first->val, struct callchain_list,
845 list);
846
847 if (match_chain(node, cnode) == MATCH_LT)
848 pp = &p->rb_left;
849 else
850 pp = &p->rb_right;
851
852 rb_link_node(&new->rb_node_in, p, pp);
853 rb_insert_color(&new->rb_node_in, &parent->rb_root_in);
854 } else {
855 parent->hit = period;
856 parent->count = 1;
857 }
858 return 0;
859}
860
861static enum match_result
862append_chain(struct callchain_node *root,
863 struct callchain_cursor *cursor,
864 u64 period);
865
866static int
867append_chain_children(struct callchain_node *root,
868 struct callchain_cursor *cursor,
869 u64 period)
870{
871 struct callchain_node *rnode;
872 struct callchain_cursor_node *node;
873 struct rb_node **p = &root->rb_root_in.rb_node;
874 struct rb_node *parent = NULL;
875
876 node = callchain_cursor_current(cursor);
877 if (!node)
878 return -1;
879
880
881 while (*p) {
882 enum match_result ret;
883
884 parent = *p;
885 rnode = rb_entry(parent, struct callchain_node, rb_node_in);
886
887
888 ret = append_chain(rnode, cursor, period);
889 if (ret == MATCH_EQ)
890 goto inc_children_hit;
891 if (ret == MATCH_ERROR)
892 return -1;
893
894 if (ret == MATCH_LT)
895 p = &parent->rb_left;
896 else
897 p = &parent->rb_right;
898 }
899
900 rnode = add_child(root, cursor, period);
901 if (rnode == NULL)
902 return -1;
903
904 rb_link_node(&rnode->rb_node_in, parent, p);
905 rb_insert_color(&rnode->rb_node_in, &root->rb_root_in);
906
907inc_children_hit:
908 root->children_hit += period;
909 root->children_count++;
910 return 0;
911}
912
913static enum match_result
914append_chain(struct callchain_node *root,
915 struct callchain_cursor *cursor,
916 u64 period)
917{
918 struct callchain_list *cnode;
919 u64 start = cursor->pos;
920 bool found = false;
921 u64 matches;
922 enum match_result cmp = MATCH_ERROR;
923
924
925
926
927
928
929
930 list_for_each_entry(cnode, &root->val, list) {
931 struct callchain_cursor_node *node;
932
933 node = callchain_cursor_current(cursor);
934 if (!node)
935 break;
936
937 cmp = match_chain(node, cnode);
938 if (cmp != MATCH_EQ)
939 break;
940
941 found = true;
942
943 callchain_cursor_advance(cursor);
944 }
945
946
947 if (!found) {
948 WARN_ONCE(cmp == MATCH_ERROR, "Chain comparison error\n");
949 return cmp;
950 }
951
952 matches = cursor->pos - start;
953
954
955 if (matches < root->val_nr) {
956 if (split_add_child(root, cursor, cnode, start, matches,
957 period) < 0)
958 return MATCH_ERROR;
959
960 return MATCH_EQ;
961 }
962
963
964 if (matches == root->val_nr && cursor->pos == cursor->nr) {
965 root->hit += period;
966 root->count++;
967 return MATCH_EQ;
968 }
969
970
971 if (append_chain_children(root, cursor, period) < 0)
972 return MATCH_ERROR;
973
974 return MATCH_EQ;
975}
976
977int callchain_append(struct callchain_root *root,
978 struct callchain_cursor *cursor,
979 u64 period)
980{
981 if (!cursor->nr)
982 return 0;
983
984 callchain_cursor_commit(cursor);
985
986 if (append_chain_children(&root->node, cursor, period) < 0)
987 return -1;
988
989 if (cursor->nr > root->max_depth)
990 root->max_depth = cursor->nr;
991
992 return 0;
993}
994
995static int
996merge_chain_branch(struct callchain_cursor *cursor,
997 struct callchain_node *dst, struct callchain_node *src)
998{
999 struct callchain_cursor_node **old_last = cursor->last;
1000 struct callchain_node *child;
1001 struct callchain_list *list, *next_list;
1002 struct rb_node *n;
1003 int old_pos = cursor->nr;
1004 int err = 0;
1005
1006 list_for_each_entry_safe(list, next_list, &src->val, list) {
1007 callchain_cursor_append(cursor, list->ip, &list->ms,
1008 false, NULL, 0, 0, 0, list->srcline);
1009 list_del_init(&list->list);
1010 map__zput(list->ms.map);
1011 free(list);
1012 }
1013
1014 if (src->hit) {
1015 callchain_cursor_commit(cursor);
1016 if (append_chain_children(dst, cursor, src->hit) < 0)
1017 return -1;
1018 }
1019
1020 n = rb_first(&src->rb_root_in);
1021 while (n) {
1022 child = container_of(n, struct callchain_node, rb_node_in);
1023 n = rb_next(n);
1024 rb_erase(&child->rb_node_in, &src->rb_root_in);
1025
1026 err = merge_chain_branch(cursor, dst, child);
1027 if (err)
1028 break;
1029
1030 free(child);
1031 }
1032
1033 cursor->nr = old_pos;
1034 cursor->last = old_last;
1035
1036 return err;
1037}
1038
1039int callchain_merge(struct callchain_cursor *cursor,
1040 struct callchain_root *dst, struct callchain_root *src)
1041{
1042 return merge_chain_branch(cursor, &dst->node, &src->node);
1043}
1044
1045int callchain_cursor_append(struct callchain_cursor *cursor,
1046 u64 ip, struct map_symbol *ms,
1047 bool branch, struct branch_flags *flags,
1048 int nr_loop_iter, u64 iter_cycles, u64 branch_from,
1049 const char *srcline)
1050{
1051 struct callchain_cursor_node *node = *cursor->last;
1052
1053 if (!node) {
1054 node = calloc(1, sizeof(*node));
1055 if (!node)
1056 return -ENOMEM;
1057
1058 *cursor->last = node;
1059 }
1060
1061 node->ip = ip;
1062 map__zput(node->ms.map);
1063 node->ms = *ms;
1064 map__get(node->ms.map);
1065 node->branch = branch;
1066 node->nr_loop_iter = nr_loop_iter;
1067 node->iter_cycles = iter_cycles;
1068 node->srcline = srcline;
1069
1070 if (flags)
1071 memcpy(&node->branch_flags, flags,
1072 sizeof(struct branch_flags));
1073
1074 node->branch_from = branch_from;
1075 cursor->nr++;
1076
1077 cursor->last = &node->next;
1078
1079 return 0;
1080}
1081
1082int sample__resolve_callchain(struct perf_sample *sample,
1083 struct callchain_cursor *cursor, struct symbol **parent,
1084 struct evsel *evsel, struct addr_location *al,
1085 int max_stack)
1086{
1087 if (sample->callchain == NULL && !symbol_conf.show_branchflag_count)
1088 return 0;
1089
1090 if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain ||
1091 perf_hpp_list.parent || symbol_conf.show_branchflag_count) {
1092 return thread__resolve_callchain(al->thread, cursor, evsel, sample,
1093 parent, al, max_stack);
1094 }
1095 return 0;
1096}
1097
1098int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample)
1099{
1100 if ((!symbol_conf.use_callchain || sample->callchain == NULL) &&
1101 !symbol_conf.show_branchflag_count)
1102 return 0;
1103 return callchain_append(he->callchain, &callchain_cursor, sample->period);
1104}
1105
1106int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node,
1107 bool hide_unresolved)
1108{
1109 al->maps = node->ms.maps;
1110 al->map = node->ms.map;
1111 al->sym = node->ms.sym;
1112 al->srcline = node->srcline;
1113 al->addr = node->ip;
1114
1115 if (al->sym == NULL) {
1116 if (hide_unresolved)
1117 return 0;
1118 if (al->map == NULL)
1119 goto out;
1120 }
1121
1122 if (al->maps == &al->maps->machine->kmaps) {
1123 if (machine__is_host(al->maps->machine)) {
1124 al->cpumode = PERF_RECORD_MISC_KERNEL;
1125 al->level = 'k';
1126 } else {
1127 al->cpumode = PERF_RECORD_MISC_GUEST_KERNEL;
1128 al->level = 'g';
1129 }
1130 } else {
1131 if (machine__is_host(al->maps->machine)) {
1132 al->cpumode = PERF_RECORD_MISC_USER;
1133 al->level = '.';
1134 } else if (perf_guest) {
1135 al->cpumode = PERF_RECORD_MISC_GUEST_USER;
1136 al->level = 'u';
1137 } else {
1138 al->cpumode = PERF_RECORD_MISC_HYPERVISOR;
1139 al->level = 'H';
1140 }
1141 }
1142
1143out:
1144 return 1;
1145}
1146
1147char *callchain_list__sym_name(struct callchain_list *cl,
1148 char *bf, size_t bfsize, bool show_dso)
1149{
1150 bool show_addr = callchain_param.key == CCKEY_ADDRESS;
1151 bool show_srcline = show_addr || callchain_param.key == CCKEY_SRCLINE;
1152 int printed;
1153
1154 if (cl->ms.sym) {
1155 const char *inlined = cl->ms.sym->inlined ? " (inlined)" : "";
1156
1157 if (show_srcline && cl->srcline)
1158 printed = scnprintf(bf, bfsize, "%s %s%s",
1159 cl->ms.sym->name, cl->srcline,
1160 inlined);
1161 else
1162 printed = scnprintf(bf, bfsize, "%s%s",
1163 cl->ms.sym->name, inlined);
1164 } else
1165 printed = scnprintf(bf, bfsize, "%#" PRIx64, cl->ip);
1166
1167 if (show_dso)
1168 scnprintf(bf + printed, bfsize - printed, " %s",
1169 cl->ms.map ?
1170 cl->ms.map->dso->short_name :
1171 "unknown");
1172
1173 return bf;
1174}
1175
1176char *callchain_node__scnprintf_value(struct callchain_node *node,
1177 char *bf, size_t bfsize, u64 total)
1178{
1179 double percent = 0.0;
1180 u64 period = callchain_cumul_hits(node);
1181 unsigned count = callchain_cumul_counts(node);
1182
1183 if (callchain_param.mode == CHAIN_FOLDED) {
1184 period = node->hit;
1185 count = node->count;
1186 }
1187
1188 switch (callchain_param.value) {
1189 case CCVAL_PERIOD:
1190 scnprintf(bf, bfsize, "%"PRIu64, period);
1191 break;
1192 case CCVAL_COUNT:
1193 scnprintf(bf, bfsize, "%u", count);
1194 break;
1195 case CCVAL_PERCENT:
1196 default:
1197 if (total)
1198 percent = period * 100.0 / total;
1199 scnprintf(bf, bfsize, "%.2f%%", percent);
1200 break;
1201 }
1202 return bf;
1203}
1204
1205int callchain_node__fprintf_value(struct callchain_node *node,
1206 FILE *fp, u64 total)
1207{
1208 double percent = 0.0;
1209 u64 period = callchain_cumul_hits(node);
1210 unsigned count = callchain_cumul_counts(node);
1211
1212 if (callchain_param.mode == CHAIN_FOLDED) {
1213 period = node->hit;
1214 count = node->count;
1215 }
1216
1217 switch (callchain_param.value) {
1218 case CCVAL_PERIOD:
1219 return fprintf(fp, "%"PRIu64, period);
1220 case CCVAL_COUNT:
1221 return fprintf(fp, "%u", count);
1222 case CCVAL_PERCENT:
1223 default:
1224 if (total)
1225 percent = period * 100.0 / total;
1226 return percent_color_fprintf(fp, "%.2f%%", percent);
1227 }
1228 return 0;
1229}
1230
1231static void callchain_counts_value(struct callchain_node *node,
1232 u64 *branch_count, u64 *predicted_count,
1233 u64 *abort_count, u64 *cycles_count)
1234{
1235 struct callchain_list *clist;
1236
1237 list_for_each_entry(clist, &node->val, list) {
1238 if (branch_count)
1239 *branch_count += clist->branch_count;
1240
1241 if (predicted_count)
1242 *predicted_count += clist->predicted_count;
1243
1244 if (abort_count)
1245 *abort_count += clist->abort_count;
1246
1247 if (cycles_count)
1248 *cycles_count += clist->cycles_count;
1249 }
1250}
1251
1252static int callchain_node_branch_counts_cumul(struct callchain_node *node,
1253 u64 *branch_count,
1254 u64 *predicted_count,
1255 u64 *abort_count,
1256 u64 *cycles_count)
1257{
1258 struct callchain_node *child;
1259 struct rb_node *n;
1260
1261 n = rb_first(&node->rb_root_in);
1262 while (n) {
1263 child = rb_entry(n, struct callchain_node, rb_node_in);
1264 n = rb_next(n);
1265
1266 callchain_node_branch_counts_cumul(child, branch_count,
1267 predicted_count,
1268 abort_count,
1269 cycles_count);
1270
1271 callchain_counts_value(child, branch_count,
1272 predicted_count, abort_count,
1273 cycles_count);
1274 }
1275
1276 return 0;
1277}
1278
1279int callchain_branch_counts(struct callchain_root *root,
1280 u64 *branch_count, u64 *predicted_count,
1281 u64 *abort_count, u64 *cycles_count)
1282{
1283 if (branch_count)
1284 *branch_count = 0;
1285
1286 if (predicted_count)
1287 *predicted_count = 0;
1288
1289 if (abort_count)
1290 *abort_count = 0;
1291
1292 if (cycles_count)
1293 *cycles_count = 0;
1294
1295 return callchain_node_branch_counts_cumul(&root->node,
1296 branch_count,
1297 predicted_count,
1298 abort_count,
1299 cycles_count);
1300}
1301
1302static int count_pri64_printf(int idx, const char *str, u64 value, char *bf, int bfsize)
1303{
1304 int printed;
1305
1306 printed = scnprintf(bf, bfsize, "%s%s:%" PRId64 "", (idx) ? " " : " (", str, value);
1307
1308 return printed;
1309}
1310
1311static int count_float_printf(int idx, const char *str, float value,
1312 char *bf, int bfsize, float threshold)
1313{
1314 int printed;
1315
1316 if (threshold != 0.0 && value < threshold)
1317 return 0;
1318
1319 printed = scnprintf(bf, bfsize, "%s%s:%.1f%%", (idx) ? " " : " (", str, value);
1320
1321 return printed;
1322}
1323
1324static int branch_to_str(char *bf, int bfsize,
1325 u64 branch_count, u64 predicted_count,
1326 u64 abort_count,
1327 struct branch_type_stat *brtype_stat)
1328{
1329 int printed, i = 0;
1330
1331 printed = branch_type_str(brtype_stat, bf, bfsize);
1332 if (printed)
1333 i++;
1334
1335 if (predicted_count < branch_count) {
1336 printed += count_float_printf(i++, "predicted",
1337 predicted_count * 100.0 / branch_count,
1338 bf + printed, bfsize - printed, 0.0);
1339 }
1340
1341 if (abort_count) {
1342 printed += count_float_printf(i++, "abort",
1343 abort_count * 100.0 / branch_count,
1344 bf + printed, bfsize - printed, 0.1);
1345 }
1346
1347 if (i)
1348 printed += scnprintf(bf + printed, bfsize - printed, ")");
1349
1350 return printed;
1351}
1352
1353static int branch_from_str(char *bf, int bfsize,
1354 u64 branch_count,
1355 u64 cycles_count, u64 iter_count,
1356 u64 iter_cycles, u64 from_count)
1357{
1358 int printed = 0, i = 0;
1359 u64 cycles, v = 0;
1360
1361 cycles = cycles_count / branch_count;
1362 if (cycles) {
1363 printed += count_pri64_printf(i++, "cycles",
1364 cycles,
1365 bf + printed, bfsize - printed);
1366 }
1367
1368 if (iter_count && from_count) {
1369 v = iter_count / from_count;
1370 if (v) {
1371 printed += count_pri64_printf(i++, "iter",
1372 v, bf + printed, bfsize - printed);
1373
1374 printed += count_pri64_printf(i++, "avg_cycles",
1375 iter_cycles / iter_count,
1376 bf + printed, bfsize - printed);
1377 }
1378 }
1379
1380 if (i)
1381 printed += scnprintf(bf + printed, bfsize - printed, ")");
1382
1383 return printed;
1384}
1385
1386static int counts_str_build(char *bf, int bfsize,
1387 u64 branch_count, u64 predicted_count,
1388 u64 abort_count, u64 cycles_count,
1389 u64 iter_count, u64 iter_cycles,
1390 u64 from_count,
1391 struct branch_type_stat *brtype_stat)
1392{
1393 int printed;
1394
1395 if (branch_count == 0)
1396 return scnprintf(bf, bfsize, " (calltrace)");
1397
1398 if (brtype_stat->branch_to) {
1399 printed = branch_to_str(bf, bfsize, branch_count,
1400 predicted_count, abort_count, brtype_stat);
1401 } else {
1402 printed = branch_from_str(bf, bfsize, branch_count,
1403 cycles_count, iter_count, iter_cycles,
1404 from_count);
1405 }
1406
1407 if (!printed)
1408 bf[0] = 0;
1409
1410 return printed;
1411}
1412
1413static int callchain_counts_printf(FILE *fp, char *bf, int bfsize,
1414 u64 branch_count, u64 predicted_count,
1415 u64 abort_count, u64 cycles_count,
1416 u64 iter_count, u64 iter_cycles,
1417 u64 from_count,
1418 struct branch_type_stat *brtype_stat)
1419{
1420 char str[256];
1421
1422 counts_str_build(str, sizeof(str), branch_count,
1423 predicted_count, abort_count, cycles_count,
1424 iter_count, iter_cycles, from_count, brtype_stat);
1425
1426 if (fp)
1427 return fprintf(fp, "%s", str);
1428
1429 return scnprintf(bf, bfsize, "%s", str);
1430}
1431
1432int callchain_list_counts__printf_value(struct callchain_list *clist,
1433 FILE *fp, char *bf, int bfsize)
1434{
1435 u64 branch_count, predicted_count;
1436 u64 abort_count, cycles_count;
1437 u64 iter_count, iter_cycles;
1438 u64 from_count;
1439
1440 branch_count = clist->branch_count;
1441 predicted_count = clist->predicted_count;
1442 abort_count = clist->abort_count;
1443 cycles_count = clist->cycles_count;
1444 iter_count = clist->iter_count;
1445 iter_cycles = clist->iter_cycles;
1446 from_count = clist->from_count;
1447
1448 return callchain_counts_printf(fp, bf, bfsize, branch_count,
1449 predicted_count, abort_count,
1450 cycles_count, iter_count, iter_cycles,
1451 from_count, &clist->brtype_stat);
1452}
1453
1454static void free_callchain_node(struct callchain_node *node)
1455{
1456 struct callchain_list *list, *tmp;
1457 struct callchain_node *child;
1458 struct rb_node *n;
1459
1460 list_for_each_entry_safe(list, tmp, &node->parent_val, list) {
1461 list_del_init(&list->list);
1462 map__zput(list->ms.map);
1463 free(list);
1464 }
1465
1466 list_for_each_entry_safe(list, tmp, &node->val, list) {
1467 list_del_init(&list->list);
1468 map__zput(list->ms.map);
1469 free(list);
1470 }
1471
1472 n = rb_first(&node->rb_root_in);
1473 while (n) {
1474 child = container_of(n, struct callchain_node, rb_node_in);
1475 n = rb_next(n);
1476 rb_erase(&child->rb_node_in, &node->rb_root_in);
1477
1478 free_callchain_node(child);
1479 free(child);
1480 }
1481}
1482
1483void free_callchain(struct callchain_root *root)
1484{
1485 if (!symbol_conf.use_callchain)
1486 return;
1487
1488 free_callchain_node(&root->node);
1489}
1490
1491static u64 decay_callchain_node(struct callchain_node *node)
1492{
1493 struct callchain_node *child;
1494 struct rb_node *n;
1495 u64 child_hits = 0;
1496
1497 n = rb_first(&node->rb_root_in);
1498 while (n) {
1499 child = container_of(n, struct callchain_node, rb_node_in);
1500
1501 child_hits += decay_callchain_node(child);
1502 n = rb_next(n);
1503 }
1504
1505 node->hit = (node->hit * 7) / 8;
1506 node->children_hit = child_hits;
1507
1508 return node->hit;
1509}
1510
1511void decay_callchain(struct callchain_root *root)
1512{
1513 if (!symbol_conf.use_callchain)
1514 return;
1515
1516 decay_callchain_node(&root->node);
1517}
1518
1519int callchain_node__make_parent_list(struct callchain_node *node)
1520{
1521 struct callchain_node *parent = node->parent;
1522 struct callchain_list *chain, *new;
1523 LIST_HEAD(head);
1524
1525 while (parent) {
1526 list_for_each_entry_reverse(chain, &parent->val, list) {
1527 new = malloc(sizeof(*new));
1528 if (new == NULL)
1529 goto out;
1530 *new = *chain;
1531 new->has_children = false;
1532 map__get(new->ms.map);
1533 list_add_tail(&new->list, &head);
1534 }
1535 parent = parent->parent;
1536 }
1537
1538 list_for_each_entry_safe_reverse(chain, new, &head, list)
1539 list_move_tail(&chain->list, &node->parent_val);
1540
1541 if (!list_empty(&node->parent_val)) {
1542 chain = list_first_entry(&node->parent_val, struct callchain_list, list);
1543 chain->has_children = rb_prev(&node->rb_node) || rb_next(&node->rb_node);
1544
1545 chain = list_first_entry(&node->val, struct callchain_list, list);
1546 chain->has_children = false;
1547 }
1548 return 0;
1549
1550out:
1551 list_for_each_entry_safe(chain, new, &head, list) {
1552 list_del_init(&chain->list);
1553 map__zput(chain->ms.map);
1554 free(chain);
1555 }
1556 return -ENOMEM;
1557}
1558
1559int callchain_cursor__copy(struct callchain_cursor *dst,
1560 struct callchain_cursor *src)
1561{
1562 int rc = 0;
1563
1564 callchain_cursor_reset(dst);
1565 callchain_cursor_commit(src);
1566
1567 while (true) {
1568 struct callchain_cursor_node *node;
1569
1570 node = callchain_cursor_current(src);
1571 if (node == NULL)
1572 break;
1573
1574 rc = callchain_cursor_append(dst, node->ip, &node->ms,
1575 node->branch, &node->branch_flags,
1576 node->nr_loop_iter,
1577 node->iter_cycles,
1578 node->branch_from, node->srcline);
1579 if (rc)
1580 break;
1581
1582 callchain_cursor_advance(src);
1583 }
1584
1585 return rc;
1586}
1587
1588
1589
1590
1591
1592void callchain_cursor_reset(struct callchain_cursor *cursor)
1593{
1594 struct callchain_cursor_node *node;
1595
1596 cursor->nr = 0;
1597 cursor->last = &cursor->first;
1598
1599 for (node = cursor->first; node != NULL; node = node->next)
1600 map__zput(node->ms.map);
1601}
1602
1603void callchain_param_setup(u64 sample_type)
1604{
1605 if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain) {
1606 if ((sample_type & PERF_SAMPLE_REGS_USER) &&
1607 (sample_type & PERF_SAMPLE_STACK_USER)) {
1608 callchain_param.record_mode = CALLCHAIN_DWARF;
1609 dwarf_callchain_users = true;
1610 } else if (sample_type & PERF_SAMPLE_BRANCH_STACK)
1611 callchain_param.record_mode = CALLCHAIN_LBR;
1612 else
1613 callchain_param.record_mode = CALLCHAIN_FP;
1614 }
1615}
1616
1617static bool chain_match(struct callchain_list *base_chain,
1618 struct callchain_list *pair_chain)
1619{
1620 enum match_result match;
1621
1622 match = match_chain_strings(base_chain->srcline,
1623 pair_chain->srcline);
1624 if (match != MATCH_ERROR)
1625 return match == MATCH_EQ;
1626
1627 match = match_chain_dso_addresses(base_chain->ms.map,
1628 base_chain->ip,
1629 pair_chain->ms.map,
1630 pair_chain->ip);
1631
1632 return match == MATCH_EQ;
1633}
1634
1635bool callchain_cnode_matched(struct callchain_node *base_cnode,
1636 struct callchain_node *pair_cnode)
1637{
1638 struct callchain_list *base_chain, *pair_chain;
1639 bool match = false;
1640
1641 pair_chain = list_first_entry(&pair_cnode->val,
1642 struct callchain_list,
1643 list);
1644
1645 list_for_each_entry(base_chain, &base_cnode->val, list) {
1646 if (&pair_chain->list == &pair_cnode->val)
1647 return false;
1648
1649 if (!base_chain->srcline || !pair_chain->srcline) {
1650 pair_chain = list_next_entry(pair_chain, list);
1651 continue;
1652 }
1653
1654 match = chain_match(base_chain, pair_chain);
1655 if (!match)
1656 return false;
1657
1658 pair_chain = list_next_entry(pair_chain, list);
1659 }
1660
1661
1662
1663
1664
1665 if (pair_chain && (&pair_chain->list != &pair_cnode->val))
1666 return false;
1667
1668 return match;
1669}
1670
1671static u64 count_callchain_hits(struct hist_entry *he)
1672{
1673 struct rb_root *root = &he->sorted_chain;
1674 struct rb_node *rb_node = rb_first(root);
1675 struct callchain_node *node;
1676 u64 chain_hits = 0;
1677
1678 while (rb_node) {
1679 node = rb_entry(rb_node, struct callchain_node, rb_node);
1680 chain_hits += node->hit;
1681 rb_node = rb_next(rb_node);
1682 }
1683
1684 return chain_hits;
1685}
1686
1687u64 callchain_total_hits(struct hists *hists)
1688{
1689 struct rb_node *next = rb_first_cached(&hists->entries);
1690 u64 chain_hits = 0;
1691
1692 while (next) {
1693 struct hist_entry *he = rb_entry(next, struct hist_entry,
1694 rb_node);
1695
1696 chain_hits += count_callchain_hits(he);
1697 next = rb_next(&he->rb_node);
1698 }
1699
1700 return chain_hits;
1701}
1702
1703s64 callchain_avg_cycles(struct callchain_node *cnode)
1704{
1705 struct callchain_list *chain;
1706 s64 cycles = 0;
1707
1708 list_for_each_entry(chain, &cnode->val, list) {
1709 if (chain->srcline && chain->branch_count)
1710 cycles += chain->cycles_count / chain->branch_count;
1711 }
1712
1713 return cycles;
1714}
1715
