tools/perf/util/callchain.c

   1 /*
   2  * Copyright (C) 2009-2011, Frederic Weisbecker <fweisbec@gmail.com>
   3  *
   4  * Handle the callchains from the stream in an ad-hoc radix tree and then
   5  * sort them in an rbtree.
   6  *
   7  * Using a radix for code path provides a fast retrieval and factorizes
   8  * memory use. Also that lets us use the paths in a hierarchical graph view.
   9  *
  10  */
  11
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <stdbool.h>
  15 #include <errno.h>
  16 #include <math.h>
  17
  18 #include "asm/bug.h"
  19
  20 #include "hist.h"
  21 #include "util.h"
  22 #include "sort.h"
  23 #include "machine.h"
  24 #include "callchain.h"
  25
  26 __thread struct callchain_cursor callchain_cursor;
  27
  28 int parse_callchain_record_opt(const char *arg, struct callchain_param *param)
  29 {
  30         return parse_callchain_record(arg, param);
  31 }
  32
  33 static int parse_callchain_mode(const char *value)
  34 {
  35         if (!strncmp(value, "graph", strlen(value))) {
  36                 callchain_param.mode = CHAIN_GRAPH_ABS;
  37                 return 0;
  38         }
  39         if (!strncmp(value, "flat", strlen(value))) {
  40                 callchain_param.mode = CHAIN_FLAT;
  41                 return 0;
  42         }
  43         if (!strncmp(value, "fractal", strlen(value))) {
  44                 callchain_param.mode = CHAIN_GRAPH_REL;
  45                 return 0;
  46         }
  47         if (!strncmp(value, "folded", strlen(value))) {
  48                 callchain_param.mode = CHAIN_FOLDED;
  49                 return 0;
  50         }
  51         return -1;
  52 }
  53
  54 static int parse_callchain_order(const char *value)
  55 {
  56         if (!strncmp(value, "caller", strlen(value))) {
  57                 callchain_param.order = ORDER_CALLER;
  58                 callchain_param.order_set = true;
  59                 return 0;
  60         }
  61         if (!strncmp(value, "callee", strlen(value))) {
  62                 callchain_param.order = ORDER_CALLEE;
  63                 callchain_param.order_set = true;
  64                 return 0;
  65         }
  66         return -1;
  67 }
  68
  69 static int parse_callchain_sort_key(const char *value)
  70 {
  71         if (!strncmp(value, "function", strlen(value))) {
  72                 callchain_param.key = CCKEY_FUNCTION;
  73                 return 0;
  74         }
  75         if (!strncmp(value, "address", strlen(value))) {
  76                 callchain_param.key = CCKEY_ADDRESS;
  77                 return 0;
  78         }
  79         if (!strncmp(value, "branch", strlen(value))) {
  80                 callchain_param.branch_callstack = 1;
  81                 return 0;
  82         }
  83         return -1;
  84 }
  85
  86 static int parse_callchain_value(const char *value)
  87 {
  88         if (!strncmp(value, "percent", strlen(value))) {
  89                 callchain_param.value = CCVAL_PERCENT;
  90                 return 0;
  91         }
  92         if (!strncmp(value, "period", strlen(value))) {
  93                 callchain_param.value = CCVAL_PERIOD;
  94                 return 0;
  95         }
  96         if (!strncmp(value, "count", strlen(value))) {
  97                 callchain_param.value = CCVAL_COUNT;
  98                 return 0;
  99         }
 100         return -1;
 101 }
 102
 103 static int
 104 __parse_callchain_report_opt(const char *arg, bool allow_record_opt)
 105 {
 106         char *tok;
 107         char *endptr;
 108         bool minpcnt_set = false;
 109         bool record_opt_set = false;
 110         bool try_stack_size = false;
 111
 112         callchain_param.enabled = true;
 113         symbol_conf.use_callchain = true;
 114
 115         if (!arg)
 116                 return 0;
 117
 118         while ((tok = strtok((char *)arg, ",")) != NULL) {
 119                 if (!strncmp(tok, "none", strlen(tok))) {
 120                         callchain_param.mode = CHAIN_NONE;
 121                         callchain_param.enabled = false;
 122                         symbol_conf.use_callchain = false;
 123                         return 0;
 124                 }
 125
 126                 if (!parse_callchain_mode(tok) ||
 127                     !parse_callchain_order(tok) ||
 128                     !parse_callchain_sort_key(tok) ||
 129                     !parse_callchain_value(tok)) {
 130                         /* parsing ok - move on to the next */
 131                         try_stack_size = false;
 132                         goto next;
 133                 } else if (allow_record_opt && !record_opt_set) {
 134                         if (parse_callchain_record(tok, &callchain_param))
 135                                 goto try_numbers;
 136
 137                         /* assume that number followed by 'dwarf' is stack size */
 138                         if (callchain_param.record_mode == CALLCHAIN_DWARF)
 139                                 try_stack_size = true;
 140
 141                         record_opt_set = true;
 142                         goto next;
 143                 }
 144
 145 try_numbers:
 146                 if (try_stack_size) {
 147                         unsigned long size = 0;
 148
 149                         if (get_stack_size(tok, &size) < 0)
 150                                 return -1;
 151                         callchain_param.dump_size = size;
 152                         try_stack_size = false;
 153                 } else if (!minpcnt_set) {
 154                         /* try to get the min percent */
 155                         callchain_param.min_percent = strtod(tok, &endptr);
 156                         if (tok == endptr)
 157                                 return -1;
 158                         minpcnt_set = true;
 159                 } else {
 160                         /* try print limit at last */
 161                         callchain_param.print_limit = strtoul(tok, &endptr, 0);
 162                         if (tok == endptr)
 163                                 return -1;
 164                 }
 165 next:
 166                 arg = NULL;
 167         }
 168
 169         if (callchain_register_param(&callchain_param) < 0) {
 170                 pr_err("Can't register callchain params\n");
 171                 return -1;
 172         }
 173         return 0;
 174 }
 175
 176 int parse_callchain_report_opt(const char *arg)
 177 {
 178         return __parse_callchain_report_opt(arg, false);
 179 }
 180
 181 int parse_callchain_top_opt(const char *arg)
 182 {
 183         return __parse_callchain_report_opt(arg, true);
 184 }
 185
 186 int perf_callchain_config(const char *var, const char *value)
 187 {
 188         char *endptr;
 189
 190         if (prefixcmp(var, "call-graph."))
 191                 return 0;
 192         var += sizeof("call-graph.") - 1;
 193
 194         if (!strcmp(var, "record-mode"))
 195                 return parse_callchain_record_opt(value, &callchain_param);
 196         if (!strcmp(var, "dump-size")) {
 197                 unsigned long size = 0;
 198                 int ret;
 199
 200                 ret = get_stack_size(value, &size);
 201                 callchain_param.dump_size = size;
 202
 203                 return ret;
 204         }
 205         if (!strcmp(var, "print-type"))
 206                 return parse_callchain_mode(value);
 207         if (!strcmp(var, "order"))
 208                 return parse_callchain_order(value);
 209         if (!strcmp(var, "sort-key"))
 210                 return parse_callchain_sort_key(value);
 211         if (!strcmp(var, "threshold")) {
 212                 callchain_param.min_percent = strtod(value, &endptr);
 213                 if (value == endptr)
 214                         return -1;
 215         }
 216         if (!strcmp(var, "print-limit")) {
 217                 callchain_param.print_limit = strtod(value, &endptr);
 218                 if (value == endptr)
 219                         return -1;
 220         }
 221
 222         return 0;
 223 }
 224
 225 static void
 226 rb_insert_callchain(struct rb_root *root, struct callchain_node *chain,
 227                     enum chain_mode mode)
 228 {
 229         struct rb_node **p = &root->rb_node;
 230         struct rb_node *parent = NULL;
 231         struct callchain_node *rnode;
 232         u64 chain_cumul = callchain_cumul_hits(chain);
 233
 234         while (*p) {
 235                 u64 rnode_cumul;
 236
 237                 parent = *p;
 238                 rnode = rb_entry(parent, struct callchain_node, rb_node);
 239                 rnode_cumul = callchain_cumul_hits(rnode);
 240
 241                 switch (mode) {
 242                 case CHAIN_FLAT:
 243                 case CHAIN_FOLDED:
 244                         if (rnode->hit < chain->hit)
 245                                 p = &(*p)->rb_left;
 246                         else
 247                                 p = &(*p)->rb_right;
 248                         break;
 249                 case CHAIN_GRAPH_ABS: /* Falldown */
 250                 case CHAIN_GRAPH_REL:
 251                         if (rnode_cumul < chain_cumul)
 252                                 p = &(*p)->rb_left;
 253                         else
 254                                 p = &(*p)->rb_right;
 255                         break;
 256                 case CHAIN_NONE:
 257                 default:
 258                         break;
 259                 }
 260         }
 261
 262         rb_link_node(&chain->rb_node, parent, p);
 263         rb_insert_color(&chain->rb_node, root);
 264 }
 265
 266 static void
 267 __sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node,
 268                   u64 min_hit)
 269 {
 270         struct rb_node *n;
 271         struct callchain_node *child;
 272
 273         n = rb_first(&node->rb_root_in);
 274         while (n) {
 275                 child = rb_entry(n, struct callchain_node, rb_node_in);
 276                 n = rb_next(n);
 277
 278                 __sort_chain_flat(rb_root, child, min_hit);
 279         }
 280
 281         if (node->hit && node->hit >= min_hit)
 282                 rb_insert_callchain(rb_root, node, CHAIN_FLAT);
 283 }
 284
 285 /*
 286  * Once we get every callchains from the stream, we can now
 287  * sort them by hit
 288  */
 289 static void
 290 sort_chain_flat(struct rb_root *rb_root, struct callchain_root *root,
 291                 u64 min_hit, struct callchain_param *param __maybe_unused)
 292 {
 293         *rb_root = RB_ROOT;
 294         __sort_chain_flat(rb_root, &root->node, min_hit);
 295 }
 296
 297 static void __sort_chain_graph_abs(struct callchain_node *node,
 298                                    u64 min_hit)
 299 {
 300         struct rb_node *n;
 301         struct callchain_node *child;
 302
 303         node->rb_root = RB_ROOT;
 304         n = rb_first(&node->rb_root_in);
 305
 306         while (n) {
 307                 child = rb_entry(n, struct callchain_node, rb_node_in);
 308                 n = rb_next(n);
 309
 310                 __sort_chain_graph_abs(child, min_hit);
 311                 if (callchain_cumul_hits(child) >= min_hit)
 312                         rb_insert_callchain(&node->rb_root, child,
 313                                             CHAIN_GRAPH_ABS);
 314         }
 315 }
 316
 317 static void
 318 sort_chain_graph_abs(struct rb_root *rb_root, struct callchain_root *chain_root,
 319                      u64 min_hit, struct callchain_param *param __maybe_unused)
 320 {
 321         __sort_chain_graph_abs(&chain_root->node, min_hit);
 322         rb_root->rb_node = chain_root->node.rb_root.rb_node;
 323 }
 324
 325 static void __sort_chain_graph_rel(struct callchain_node *node,
 326                                    double min_percent)
 327 {
 328         struct rb_node *n;
 329         struct callchain_node *child;
 330         u64 min_hit;
 331
 332         node->rb_root = RB_ROOT;
 333         min_hit = ceil(node->children_hit * min_percent);
 334
 335         n = rb_first(&node->rb_root_in);
 336         while (n) {
 337                 child = rb_entry(n, struct callchain_node, rb_node_in);
 338                 n = rb_next(n);
 339
 340                 __sort_chain_graph_rel(child, min_percent);
 341                 if (callchain_cumul_hits(child) >= min_hit)
 342                         rb_insert_callchain(&node->rb_root, child,
 343                                             CHAIN_GRAPH_REL);
 344         }
 345 }
 346
 347 static void
 348 sort_chain_graph_rel(struct rb_root *rb_root, struct callchain_root *chain_root,
 349                      u64 min_hit __maybe_unused, struct callchain_param *param)
 350 {
 351         __sort_chain_graph_rel(&chain_root->node, param->min_percent / 100.0);
 352         rb_root->rb_node = chain_root->node.rb_root.rb_node;
 353 }
 354
 355 int callchain_register_param(struct callchain_param *param)
 356 {
 357         switch (param->mode) {
 358         case CHAIN_GRAPH_ABS:
 359                 param->sort = sort_chain_graph_abs;
 360                 break;
 361         case CHAIN_GRAPH_REL:
 362                 param->sort = sort_chain_graph_rel;
 363                 break;
 364         case CHAIN_FLAT:
 365         case CHAIN_FOLDED:
 366                 param->sort = sort_chain_flat;
 367                 break;
 368         case CHAIN_NONE:
 369         default:
 370                 return -1;
 371         }
 372         return 0;
 373 }
 374
 375 /*
 376  * Create a child for a parent. If inherit_children, then the new child
 377  * will become the new parent of it's parent children
 378  */
 379 static struct callchain_node *
 380 create_child(struct callchain_node *parent, bool inherit_children)
 381 {
 382         struct callchain_node *new;
 383
 384         new = zalloc(sizeof(*new));
 385         if (!new) {
 386                 perror("not enough memory to create child for code path tree");
 387                 return NULL;
 388         }
 389         new->parent = parent;
 390         INIT_LIST_HEAD(&new->val);
 391         INIT_LIST_HEAD(&new->parent_val);
 392
 393         if (inherit_children) {
 394                 struct rb_node *n;
 395                 struct callchain_node *child;
 396
 397                 new->rb_root_in = parent->rb_root_in;
 398                 parent->rb_root_in = RB_ROOT;
 399
 400                 n = rb_first(&new->rb_root_in);
 401                 while (n) {
 402                         child = rb_entry(n, struct callchain_node, rb_node_in);
 403                         child->parent = new;
 404                         n = rb_next(n);
 405                 }
 406
 407                 /* make it the first child */
 408                 rb_link_node(&new->rb_node_in, NULL, &parent->rb_root_in.rb_node);
 409                 rb_insert_color(&new->rb_node_in, &parent->rb_root_in);
 410         }
 411
 412         return new;
 413 }
 414
 415
 416 /*
 417  * Fill the node with callchain values
 418  */
 419 static int
 420 fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
 421 {
 422         struct callchain_cursor_node *cursor_node;
 423
 424         node->val_nr = cursor->nr - cursor->pos;
 425         if (!node->val_nr)
 426                 pr_warning("Warning: empty node in callchain tree\n");
 427
 428         cursor_node = callchain_cursor_current(cursor);
 429
 430         while (cursor_node) {
 431                 struct callchain_list *call;
 432
 433                 call = zalloc(sizeof(*call));
 434                 if (!call) {
 435                         perror("not enough memory for the code path tree");
 436                         return -1;
 437                 }
 438                 call->ip = cursor_node->ip;
 439                 call->ms.sym = cursor_node->sym;
 440                 call->ms.map = cursor_node->map;
 441                 list_add_tail(&call->list, &node->val);
 442
 443                 callchain_cursor_advance(cursor);
 444                 cursor_node = callchain_cursor_current(cursor);
 445         }
 446         return 0;
 447 }
 448
 449 static struct callchain_node *
 450 add_child(struct callchain_node *parent,
 451           struct callchain_cursor *cursor,
 452           u64 period)
 453 {
 454         struct callchain_node *new;
 455
 456         new = create_child(parent, false);
 457         if (new == NULL)
 458                 return NULL;
 459
 460         if (fill_node(new, cursor) < 0) {
 461                 struct callchain_list *call, *tmp;
 462
 463                 list_for_each_entry_safe(call, tmp, &new->val, list) {
 464                         list_del(&call->list);
 465                         free(call);
 466                 }
 467                 free(new);
 468                 return NULL;
 469         }
 470
 471         new->children_hit = 0;
 472         new->hit = period;
 473         new->children_count = 0;
 474         new->count = 1;
 475         return new;
 476 }
 477
 478 enum match_result {
 479         MATCH_ERROR  = -1,
 480         MATCH_EQ,
 481         MATCH_LT,
 482         MATCH_GT,
 483 };
 484
 485 static enum match_result match_chain(struct callchain_cursor_node *node,
 486                                      struct callchain_list *cnode)
 487 {
 488         struct symbol *sym = node->sym;
 489         u64 left, right;
 490
 491         if (cnode->ms.sym && sym &&
 492             callchain_param.key == CCKEY_FUNCTION) {
 493                 left = cnode->ms.sym->start;
 494                 right = sym->start;
 495         } else {
 496                 left = cnode->ip;
 497                 right = node->ip;
 498         }
 499
 500         if (left == right)
 501                 return MATCH_EQ;
 502
 503         return left > right ? MATCH_GT : MATCH_LT;
 504 }
 505
 506 /*
 507  * Split the parent in two parts (a new child is created) and
 508  * give a part of its callchain to the created child.
 509  * Then create another child to host the given callchain of new branch
 510  */
 511 static int
 512 split_add_child(struct callchain_node *parent,
 513                 struct callchain_cursor *cursor,
 514                 struct callchain_list *to_split,
 515                 u64 idx_parents, u64 idx_local, u64 period)
 516 {
 517         struct callchain_node *new;
 518         struct list_head *old_tail;
 519         unsigned int idx_total = idx_parents + idx_local;
 520
 521         /* split */
 522         new = create_child(parent, true);
 523         if (new == NULL)
 524                 return -1;
 525
 526         /* split the callchain and move a part to the new child */
 527         old_tail = parent->val.prev;
 528         list_del_range(&to_split->list, old_tail);
 529         new->val.next = &to_split->list;
 530         new->val.prev = old_tail;
 531         to_split->list.prev = &new->val;
 532         old_tail->next = &new->val;
 533
 534         /* split the hits */
 535         new->hit = parent->hit;
 536         new->children_hit = parent->children_hit;
 537         parent->children_hit = callchain_cumul_hits(new);
 538         new->val_nr = parent->val_nr - idx_local;
 539         parent->val_nr = idx_local;
 540         new->count = parent->count;
 541         new->children_count = parent->children_count;
 542         parent->children_count = callchain_cumul_counts(new);
 543
 544         /* create a new child for the new branch if any */
 545         if (idx_total < cursor->nr) {
 546                 struct callchain_node *first;
 547                 struct callchain_list *cnode;
 548                 struct callchain_cursor_node *node;
 549                 struct rb_node *p, **pp;
 550
 551                 parent->hit = 0;
 552                 parent->children_hit += period;
 553                 parent->count = 0;
 554                 parent->children_count += 1;
 555
 556                 node = callchain_cursor_current(cursor);
 557                 new = add_child(parent, cursor, period);
 558                 if (new == NULL)
 559                         return -1;
 560
 561                 /*
 562                  * This is second child since we moved parent's children
 563                  * to new (first) child above.
 564                  */
 565                 p = parent->rb_root_in.rb_node;
 566                 first = rb_entry(p, struct callchain_node, rb_node_in);
 567                 cnode = list_first_entry(&first->val, struct callchain_list,
 568                                          list);
 569
 570                 if (match_chain(node, cnode) == MATCH_LT)
 571                         pp = &p->rb_left;
 572                 else
 573                         pp = &p->rb_right;
 574
 575                 rb_link_node(&new->rb_node_in, p, pp);
 576                 rb_insert_color(&new->rb_node_in, &parent->rb_root_in);
 577         } else {
 578                 parent->hit = period;
 579                 parent->count = 1;
 580         }
 581         return 0;
 582 }
 583
 584 static enum match_result
 585 append_chain(struct callchain_node *root,
 586              struct callchain_cursor *cursor,
 587              u64 period);
 588
 589 static int
 590 append_chain_children(struct callchain_node *root,
 591                       struct callchain_cursor *cursor,
 592                       u64 period)
 593 {
 594         struct callchain_node *rnode;
 595         struct callchain_cursor_node *node;
 596         struct rb_node **p = &root->rb_root_in.rb_node;
 597         struct rb_node *parent = NULL;
 598
 599         node = callchain_cursor_current(cursor);
 600         if (!node)
 601                 return -1;
 602
 603         /* lookup in childrens */
 604         while (*p) {
 605                 enum match_result ret;
 606
 607                 parent = *p;
 608                 rnode = rb_entry(parent, struct callchain_node, rb_node_in);
 609
 610                 /* If at least first entry matches, rely to children */
 611                 ret = append_chain(rnode, cursor, period);
 612                 if (ret == MATCH_EQ)
 613                         goto inc_children_hit;
 614                 if (ret == MATCH_ERROR)
 615                         return -1;
 616
 617                 if (ret == MATCH_LT)
 618                         p = &parent->rb_left;
 619                 else
 620                         p = &parent->rb_right;
 621         }
 622         /* nothing in children, add to the current node */
 623         rnode = add_child(root, cursor, period);
 624         if (rnode == NULL)
 625                 return -1;
 626
 627         rb_link_node(&rnode->rb_node_in, parent, p);
 628         rb_insert_color(&rnode->rb_node_in, &root->rb_root_in);
 629
 630 inc_children_hit:
 631         root->children_hit += period;
 632         root->children_count++;
 633         return 0;
 634 }
 635
 636 static enum match_result
 637 append_chain(struct callchain_node *root,
 638              struct callchain_cursor *cursor,
 639              u64 period)
 640 {
 641         struct callchain_list *cnode;
 642         u64 start = cursor->pos;
 643         bool found = false;
 644         u64 matches;
 645         enum match_result cmp = MATCH_ERROR;
 646
 647         /*
 648          * Lookup in the current node
 649          * If we have a symbol, then compare the start to match
 650          * anywhere inside a function, unless function
 651          * mode is disabled.
 652          */
 653         list_for_each_entry(cnode, &root->val, list) {
 654                 struct callchain_cursor_node *node;
 655
 656                 node = callchain_cursor_current(cursor);
 657                 if (!node)
 658                         break;
 659
 660                 cmp = match_chain(node, cnode);
 661                 if (cmp != MATCH_EQ)
 662                         break;
 663
 664                 found = true;
 665
 666                 callchain_cursor_advance(cursor);
 667         }
 668
 669         /* matches not, relay no the parent */
 670         if (!found) {
 671                 WARN_ONCE(cmp == MATCH_ERROR, "Chain comparison error\n");
 672                 return cmp;
 673         }
 674
 675         matches = cursor->pos - start;
 676
 677         /* we match only a part of the node. Split it and add the new chain */
 678         if (matches < root->val_nr) {
 679                 if (split_add_child(root, cursor, cnode, start, matches,
 680                                     period) < 0)
 681                         return MATCH_ERROR;
 682
 683                 return MATCH_EQ;
 684         }
 685
 686         /* we match 100% of the path, increment the hit */
 687         if (matches == root->val_nr && cursor->pos == cursor->nr) {
 688                 root->hit += period;
 689                 root->count++;
 690                 return MATCH_EQ;
 691         }
 692
 693         /* We match the node and still have a part remaining */
 694         if (append_chain_children(root, cursor, period) < 0)
 695                 return MATCH_ERROR;
 696
 697         return MATCH_EQ;
 698 }
 699
 700 int callchain_append(struct callchain_root *root,
 701                      struct callchain_cursor *cursor,
 702                      u64 period)
 703 {
 704         if (!cursor->nr)
 705                 return 0;
 706
 707         callchain_cursor_commit(cursor);
 708
 709         if (append_chain_children(&root->node, cursor, period) < 0)
 710                 return -1;
 711
 712         if (cursor->nr > root->max_depth)
 713                 root->max_depth = cursor->nr;
 714
 715         return 0;
 716 }
 717
 718 static int
 719 merge_chain_branch(struct callchain_cursor *cursor,
 720                    struct callchain_node *dst, struct callchain_node *src)
 721 {
 722         struct callchain_cursor_node **old_last = cursor->last;
 723         struct callchain_node *child;
 724         struct callchain_list *list, *next_list;
 725         struct rb_node *n;
 726         int old_pos = cursor->nr;
 727         int err = 0;
 728
 729         list_for_each_entry_safe(list, next_list, &src->val, list) {
 730                 callchain_cursor_append(cursor, list->ip,
 731                                         list->ms.map, list->ms.sym,
 732                                         false, NULL, 0, 0);
 733                 list_del(&list->list);
 734                 free(list);
 735         }
 736
 737         if (src->hit) {
 738                 callchain_cursor_commit(cursor);
 739                 if (append_chain_children(dst, cursor, src->hit) < 0)
 740                         return -1;
 741         }
 742
 743         n = rb_first(&src->rb_root_in);
 744         while (n) {
 745                 child = container_of(n, struct callchain_node, rb_node_in);
 746                 n = rb_next(n);
 747                 rb_erase(&child->rb_node_in, &src->rb_root_in);
 748
 749                 err = merge_chain_branch(cursor, dst, child);
 750                 if (err)
 751                         break;
 752
 753                 free(child);
 754         }
 755
 756         cursor->nr = old_pos;
 757         cursor->last = old_last;
 758
 759         return err;
 760 }
 761
 762 int callchain_merge(struct callchain_cursor *cursor,
 763                     struct callchain_root *dst, struct callchain_root *src)
 764 {
 765         return merge_chain_branch(cursor, &dst->node, &src->node);
 766 }
 767
 768 int callchain_cursor_append(struct callchain_cursor *cursor,
 769                             u64 ip, struct map *map, struct symbol *sym,
 770                             bool branch, struct branch_flags *flags,
 771                             int nr_loop_iter, int samples)
 772 {
 773         struct callchain_cursor_node *node = *cursor->last;
 774
 775         if (!node) {
 776                 node = calloc(1, sizeof(*node));
 777                 if (!node)
 778                         return -ENOMEM;
 779
 780                 *cursor->last = node;
 781         }
 782
 783         node->ip = ip;
 784         node->map = map;
 785         node->sym = sym;
 786         node->branch = branch;
 787         node->nr_loop_iter = nr_loop_iter;
 788         node->samples = samples;
 789
 790         if (flags)
 791                 memcpy(&node->branch_flags, flags,
 792                         sizeof(struct branch_flags));
 793
 794         cursor->nr++;
 795
 796         cursor->last = &node->next;
 797
 798         return 0;
 799 }
 800
 801 int sample__resolve_callchain(struct perf_sample *sample,
 802                               struct callchain_cursor *cursor, struct symbol **parent,
 803                               struct perf_evsel *evsel, struct addr_location *al,
 804                               int max_stack)
 805 {
 806         if (sample->callchain == NULL)
 807                 return 0;
 808
 809         if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain ||
 810             perf_hpp_list.parent) {
 811                 return thread__resolve_callchain(al->thread, cursor, evsel, sample,
 812                                                  parent, al, max_stack);
 813         }
 814         return 0;
 815 }
 816
 817 int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample)
 818 {
 819         if (!symbol_conf.use_callchain || sample->callchain == NULL)
 820                 return 0;
 821         return callchain_append(he->callchain, &callchain_cursor, sample->period);
 822 }
 823
 824 int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node,
 825                         bool hide_unresolved)
 826 {
 827         al->map = node->map;
 828         al->sym = node->sym;
 829         if (node->map)
 830                 al->addr = node->map->map_ip(node->map, node->ip);
 831         else
 832                 al->addr = node->ip;
 833
 834         if (al->sym == NULL) {
 835                 if (hide_unresolved)
 836                         return 0;
 837                 if (al->map == NULL)
 838                         goto out;
 839         }
 840
 841         if (al->map->groups == &al->machine->kmaps) {
 842                 if (machine__is_host(al->machine)) {
 843                         al->cpumode = PERF_RECORD_MISC_KERNEL;
 844                         al->level = 'k';
 845                 } else {
 846                         al->cpumode = PERF_RECORD_MISC_GUEST_KERNEL;
 847                         al->level = 'g';
 848                 }
 849         } else {
 850                 if (machine__is_host(al->machine)) {
 851                         al->cpumode = PERF_RECORD_MISC_USER;
 852                         al->level = '.';
 853                 } else if (perf_guest) {
 854                         al->cpumode = PERF_RECORD_MISC_GUEST_USER;
 855                         al->level = 'u';
 856                 } else {
 857                         al->cpumode = PERF_RECORD_MISC_HYPERVISOR;
 858                         al->level = 'H';
 859                 }
 860         }
 861
 862 out:
 863         return 1;
 864 }
 865
 866 char *callchain_list__sym_name(struct callchain_list *cl,
 867                                char *bf, size_t bfsize, bool show_dso)
 868 {
 869         int printed;
 870
 871         if (cl->ms.sym) {
 872                 if (callchain_param.key == CCKEY_ADDRESS &&
 873                     cl->ms.map && !cl->srcline)
 874                         cl->srcline = get_srcline(cl->ms.map->dso,
 875                                                   map__rip_2objdump(cl->ms.map,
 876                                                                     cl->ip),
 877                                                   cl->ms.sym, false);
 878                 if (cl->srcline)
 879                         printed = scnprintf(bf, bfsize, "%s %s",
 880                                         cl->ms.sym->name, cl->srcline);
 881                 else
 882                         printed = scnprintf(bf, bfsize, "%s", cl->ms.sym->name);
 883         } else
 884                 printed = scnprintf(bf, bfsize, "%#" PRIx64, cl->ip);
 885
 886         if (show_dso)
 887                 scnprintf(bf + printed, bfsize - printed, " %s",
 888                           cl->ms.map ?
 889                           cl->ms.map->dso->short_name :
 890                           "unknown");
 891
 892         return bf;
 893 }
 894
 895 char *callchain_node__scnprintf_value(struct callchain_node *node,
 896                                       char *bf, size_t bfsize, u64 total)
 897 {
 898         double percent = 0.0;
 899         u64 period = callchain_cumul_hits(node);
 900         unsigned count = callchain_cumul_counts(node);
 901
 902         if (callchain_param.mode == CHAIN_FOLDED) {
 903                 period = node->hit;
 904                 count = node->count;
 905         }
 906
 907         switch (callchain_param.value) {
 908         case CCVAL_PERIOD:
 909                 scnprintf(bf, bfsize, "%"PRIu64, period);
 910                 break;
 911         case CCVAL_COUNT:
 912                 scnprintf(bf, bfsize, "%u", count);
 913                 break;
 914         case CCVAL_PERCENT:
 915         default:
 916                 if (total)
 917                         percent = period * 100.0 / total;
 918                 scnprintf(bf, bfsize, "%.2f%%", percent);
 919                 break;
 920         }
 921         return bf;
 922 }
 923
 924 int callchain_node__fprintf_value(struct callchain_node *node,
 925                                  FILE *fp, u64 total)
 926 {
 927         double percent = 0.0;
 928         u64 period = callchain_cumul_hits(node);
 929         unsigned count = callchain_cumul_counts(node);
 930
 931         if (callchain_param.mode == CHAIN_FOLDED) {
 932                 period = node->hit;
 933                 count = node->count;
 934         }
 935
 936         switch (callchain_param.value) {
 937         case CCVAL_PERIOD:
 938                 return fprintf(fp, "%"PRIu64, period);
 939         case CCVAL_COUNT:
 940                 return fprintf(fp, "%u", count);
 941         case CCVAL_PERCENT:
 942         default:
 943                 if (total)
 944                         percent = period * 100.0 / total;
 945                 return percent_color_fprintf(fp, "%.2f%%", percent);
 946         }
 947         return 0;
 948 }
 949
 950 static void free_callchain_node(struct callchain_node *node)
 951 {
 952         struct callchain_list *list, *tmp;
 953         struct callchain_node *child;
 954         struct rb_node *n;
 955
 956         list_for_each_entry_safe(list, tmp, &node->parent_val, list) {
 957                 list_del(&list->list);
 958                 free(list);
 959         }
 960
 961         list_for_each_entry_safe(list, tmp, &node->val, list) {
 962                 list_del(&list->list);
 963                 free(list);
 964         }
 965
 966         n = rb_first(&node->rb_root_in);
 967         while (n) {
 968                 child = container_of(n, struct callchain_node, rb_node_in);
 969                 n = rb_next(n);
 970                 rb_erase(&child->rb_node_in, &node->rb_root_in);
 971
 972                 free_callchain_node(child);
 973                 free(child);
 974         }
 975 }
 976
 977 void free_callchain(struct callchain_root *root)
 978 {
 979         if (!symbol_conf.use_callchain)
 980                 return;
 981
 982         free_callchain_node(&root->node);
 983 }
 984
 985 static u64 decay_callchain_node(struct callchain_node *node)
 986 {
 987         struct callchain_node *child;
 988         struct rb_node *n;
 989         u64 child_hits = 0;
 990
 991         n = rb_first(&node->rb_root_in);
 992         while (n) {
 993                 child = container_of(n, struct callchain_node, rb_node_in);
 994
 995                 child_hits += decay_callchain_node(child);
 996                 n = rb_next(n);
 997         }
 998
 999         node->hit = (node->hit * 7) / 8;
1000         node->children_hit = child_hits;
1001
1002         return node->hit;
1003 }
1004
1005 void decay_callchain(struct callchain_root *root)
1006 {
1007         if (!symbol_conf.use_callchain)
1008                 return;
1009
1010         decay_callchain_node(&root->node);
1011 }
1012
1013 int callchain_node__make_parent_list(struct callchain_node *node)
1014 {
1015         struct callchain_node *parent = node->parent;
1016         struct callchain_list *chain, *new;
1017         LIST_HEAD(head);
1018
1019         while (parent) {
1020                 list_for_each_entry_reverse(chain, &parent->val, list) {
1021                         new = malloc(sizeof(*new));
1022                         if (new == NULL)
1023                                 goto out;
1024                         *new = *chain;
1025                         new->has_children = false;
1026                         list_add_tail(&new->list, &head);
1027                 }
1028                 parent = parent->parent;
1029         }
1030
1031         list_for_each_entry_safe_reverse(chain, new, &head, list)
1032                 list_move_tail(&chain->list, &node->parent_val);
1033
1034         if (!list_empty(&node->parent_val)) {
1035                 chain = list_first_entry(&node->parent_val, struct callchain_list, list);
1036                 chain->has_children = rb_prev(&node->rb_node) || rb_next(&node->rb_node);
1037
1038                 chain = list_first_entry(&node->val, struct callchain_list, list);
1039                 chain->has_children = false;
1040         }
1041         return 0;
1042
1043 out:
1044         list_for_each_entry_safe(chain, new, &head, list) {
1045                 list_del(&chain->list);
1046                 free(chain);
1047         }
1048         return -ENOMEM;
1049 }