tools/perf/builtin-diff.c

   1 /*
   2  * builtin-diff.c
   3  *
   4  * Builtin diff command: Analyze two perf.data input files, look up and read
   5  * DSOs and symbol information, sort them and produce a diff.
   6  */
   7 #include "builtin.h"
   8
   9 #include "util/debug.h"
  10 #include "util/event.h"
  11 #include "util/hist.h"
  12 #include "util/evsel.h"
  13 #include "util/evlist.h"
  14 #include "util/session.h"
  15 #include "util/tool.h"
  16 #include "util/sort.h"
  17 #include "util/symbol.h"
  18 #include "util/util.h"
  19
  20 #include <stdlib.h>
  21
  22 static char const *input_old = "perf.data.old",
  23                   *input_new = "perf.data";
  24 static char       diff__default_sort_order[] = "dso,symbol";
  25 static bool  force;
  26 static bool show_period;
  27 static bool show_formula;
  28 static bool show_baseline_only;
  29 static bool sort_compute;
  30
  31 static s64 compute_wdiff_w1;
  32 static s64 compute_wdiff_w2;
  33
  34 enum {
  35         COMPUTE_DELTA,
  36         COMPUTE_RATIO,
  37         COMPUTE_WEIGHTED_DIFF,
  38         COMPUTE_MAX,
  39 };
  40
  41 const char *compute_names[COMPUTE_MAX] = {
  42         [COMPUTE_DELTA] = "delta",
  43         [COMPUTE_RATIO] = "ratio",
  44         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
  45 };
  46
  47 static int compute;
  48
  49 static int setup_compute_opt_wdiff(char *opt)
  50 {
  51         char *w1_str = opt;
  52         char *w2_str;
  53
  54         int ret = -EINVAL;
  55
  56         if (!opt)
  57                 goto out;
  58
  59         w2_str = strchr(opt, ',');
  60         if (!w2_str)
  61                 goto out;
  62
  63         *w2_str++ = 0x0;
  64         if (!*w2_str)
  65                 goto out;
  66
  67         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
  68         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
  69
  70         if (!compute_wdiff_w1 || !compute_wdiff_w2)
  71                 goto out;
  72
  73         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
  74                   compute_wdiff_w1, compute_wdiff_w2);
  75
  76         ret = 0;
  77
  78  out:
  79         if (ret)
  80                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
  81
  82         return ret;
  83 }
  84
  85 static int setup_compute_opt(char *opt)
  86 {
  87         if (compute == COMPUTE_WEIGHTED_DIFF)
  88                 return setup_compute_opt_wdiff(opt);
  89
  90         if (opt) {
  91                 pr_err("Failed: extra option specified '%s'", opt);
  92                 return -EINVAL;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int setup_compute(const struct option *opt, const char *str,
  99                          int unset __maybe_unused)
 100 {
 101         int *cp = (int *) opt->value;
 102         char *cstr = (char *) str;
 103         char buf[50];
 104         unsigned i;
 105         char *option;
 106
 107         if (!str) {
 108                 *cp = COMPUTE_DELTA;
 109                 return 0;
 110         }
 111
 112         if (*str == '+') {
 113                 sort_compute = true;
 114                 cstr = (char *) ++str;
 115                 if (!*str)
 116                         return 0;
 117         }
 118
 119         option = strchr(str, ':');
 120         if (option) {
 121                 unsigned len = option++ - str;
 122
 123                 /*
 124                  * The str data are not writeable, so we need
 125                  * to use another buffer.
 126                  */
 127
 128                 /* No option value is longer. */
 129                 if (len >= sizeof(buf))
 130                         return -EINVAL;
 131
 132                 strncpy(buf, str, len);
 133                 buf[len] = 0x0;
 134                 cstr = buf;
 135         }
 136
 137         for (i = 0; i < COMPUTE_MAX; i++)
 138                 if (!strcmp(cstr, compute_names[i])) {
 139                         *cp = i;
 140                         return setup_compute_opt(option);
 141                 }
 142
 143         pr_err("Failed: '%s' is not computation method "
 144                "(use 'delta','ratio' or 'wdiff')\n", str);
 145         return -EINVAL;
 146 }
 147
 148 double perf_diff__period_percent(struct hist_entry *he, u64 period)
 149 {
 150         u64 total = he->hists->stats.total_period;
 151         return (period * 100.0) / total;
 152 }
 153
 154 double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair)
 155 {
 156         double new_percent = perf_diff__period_percent(he, he->stat.period);
 157         double old_percent = perf_diff__period_percent(pair, pair->stat.period);
 158
 159         he->diff.period_ratio_delta = new_percent - old_percent;
 160         he->diff.computed = true;
 161         return he->diff.period_ratio_delta;
 162 }
 163
 164 double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 165 {
 166         double new_period = he->stat.period;
 167         double old_period = pair->stat.period;
 168
 169         he->diff.computed = true;
 170         he->diff.period_ratio = new_period / old_period;
 171         return he->diff.period_ratio;
 172 }
 173
 174 s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 175 {
 176         u64 new_period = he->stat.period;
 177         u64 old_period = pair->stat.period;
 178
 179         he->diff.computed = true;
 180         he->diff.wdiff = new_period * compute_wdiff_w2 -
 181                          old_period * compute_wdiff_w1;
 182
 183         return he->diff.wdiff;
 184 }
 185
 186 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 187                          char *buf, size_t size)
 188 {
 189         return scnprintf(buf, size,
 190                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 191                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 192                           he->stat.period, he->hists->stats.total_period,
 193                           pair->stat.period, pair->hists->stats.total_period);
 194 }
 195
 196 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 197                          char *buf, size_t size)
 198 {
 199         double new_period = he->stat.period;
 200         double old_period = pair->stat.period;
 201
 202         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 203 }
 204
 205 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 206                          char *buf, size_t size)
 207 {
 208         u64 new_period = he->stat.period;
 209         u64 old_period = pair->stat.period;
 210
 211         return scnprintf(buf, size,
 212                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 213                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 214 }
 215
 216 int perf_diff__formula(struct hist_entry *he, struct hist_entry *pair,
 217                        char *buf, size_t size)
 218 {
 219         switch (compute) {
 220         case COMPUTE_DELTA:
 221                 return formula_delta(he, pair, buf, size);
 222         case COMPUTE_RATIO:
 223                 return formula_ratio(he, pair, buf, size);
 224         case COMPUTE_WEIGHTED_DIFF:
 225                 return formula_wdiff(he, pair, buf, size);
 226         default:
 227                 BUG_ON(1);
 228         }
 229
 230         return -1;
 231 }
 232
 233 static int hists__add_entry(struct hists *self,
 234                             struct addr_location *al, u64 period,
 235                             u64 weight)
 236 {
 237         if (__hists__add_entry(self, al, NULL, period, weight) != NULL)
 238                 return 0;
 239         return -ENOMEM;
 240 }
 241
 242 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
 243                                       union perf_event *event,
 244                                       struct perf_sample *sample,
 245                                       struct perf_evsel *evsel,
 246                                       struct machine *machine)
 247 {
 248         struct addr_location al;
 249
 250         if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
 251                 pr_warning("problem processing %d event, skipping it.\n",
 252                            event->header.type);
 253                 return -1;
 254         }
 255
 256         if (al.filtered)
 257                 return 0;
 258
 259         if (hists__add_entry(&evsel->hists, &al, sample->period, sample->weight)) {
 260                 pr_warning("problem incrementing symbol period, skipping event\n");
 261                 return -1;
 262         }
 263
 264         evsel->hists.stats.total_period += sample->period;
 265         return 0;
 266 }
 267
 268 static struct perf_tool tool = {
 269         .sample = diff__process_sample_event,
 270         .mmap   = perf_event__process_mmap,
 271         .comm   = perf_event__process_comm,
 272         .exit   = perf_event__process_exit,
 273         .fork   = perf_event__process_fork,
 274         .lost   = perf_event__process_lost,
 275         .ordered_samples = true,
 276         .ordering_requires_timestamps = true,
 277 };
 278
 279 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 280                                       struct perf_evlist *evlist)
 281 {
 282         struct perf_evsel *e;
 283
 284         list_for_each_entry(e, &evlist->entries, node)
 285                 if (perf_evsel__match2(evsel, e))
 286                         return e;
 287
 288         return NULL;
 289 }
 290
 291 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 292 {
 293         struct perf_evsel *evsel;
 294
 295         list_for_each_entry(evsel, &evlist->entries, node) {
 296                 struct hists *hists = &evsel->hists;
 297
 298                 hists__collapse_resort(hists);
 299         }
 300 }
 301
 302 static void hists__baseline_only(struct hists *hists)
 303 {
 304         struct rb_root *root;
 305         struct rb_node *next;
 306
 307         if (sort__need_collapse)
 308                 root = &hists->entries_collapsed;
 309         else
 310                 root = hists->entries_in;
 311
 312         next = rb_first(root);
 313         while (next != NULL) {
 314                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 315
 316                 next = rb_next(&he->rb_node_in);
 317                 if (!hist_entry__next_pair(he)) {
 318                         rb_erase(&he->rb_node_in, root);
 319                         hist_entry__free(he);
 320                 }
 321         }
 322 }
 323
 324 static void hists__precompute(struct hists *hists)
 325 {
 326         struct rb_root *root;
 327         struct rb_node *next;
 328
 329         if (sort__need_collapse)
 330                 root = &hists->entries_collapsed;
 331         else
 332                 root = hists->entries_in;
 333
 334         next = rb_first(root);
 335         while (next != NULL) {
 336                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 337                 struct hist_entry *pair = hist_entry__next_pair(he);
 338
 339                 next = rb_next(&he->rb_node_in);
 340                 if (!pair)
 341                         continue;
 342
 343                 switch (compute) {
 344                 case COMPUTE_DELTA:
 345                         perf_diff__compute_delta(he, pair);
 346                         break;
 347                 case COMPUTE_RATIO:
 348                         perf_diff__compute_ratio(he, pair);
 349                         break;
 350                 case COMPUTE_WEIGHTED_DIFF:
 351                         perf_diff__compute_wdiff(he, pair);
 352                         break;
 353                 default:
 354                         BUG_ON(1);
 355                 }
 356         }
 357 }
 358
 359 static int64_t cmp_doubles(double l, double r)
 360 {
 361         if (l > r)
 362                 return -1;
 363         else if (l < r)
 364                 return 1;
 365         else
 366                 return 0;
 367 }
 368
 369 static int64_t
 370 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 371                         int c)
 372 {
 373         switch (c) {
 374         case COMPUTE_DELTA:
 375         {
 376                 double l = left->diff.period_ratio_delta;
 377                 double r = right->diff.period_ratio_delta;
 378
 379                 return cmp_doubles(l, r);
 380         }
 381         case COMPUTE_RATIO:
 382         {
 383                 double l = left->diff.period_ratio;
 384                 double r = right->diff.period_ratio;
 385
 386                 return cmp_doubles(l, r);
 387         }
 388         case COMPUTE_WEIGHTED_DIFF:
 389         {
 390                 s64 l = left->diff.wdiff;
 391                 s64 r = right->diff.wdiff;
 392
 393                 return r - l;
 394         }
 395         default:
 396                 BUG_ON(1);
 397         }
 398
 399         return 0;
 400 }
 401
 402 static void insert_hist_entry_by_compute(struct rb_root *root,
 403                                          struct hist_entry *he,
 404                                          int c)
 405 {
 406         struct rb_node **p = &root->rb_node;
 407         struct rb_node *parent = NULL;
 408         struct hist_entry *iter;
 409
 410         while (*p != NULL) {
 411                 parent = *p;
 412                 iter = rb_entry(parent, struct hist_entry, rb_node);
 413                 if (hist_entry__cmp_compute(he, iter, c) < 0)
 414                         p = &(*p)->rb_left;
 415                 else
 416                         p = &(*p)->rb_right;
 417         }
 418
 419         rb_link_node(&he->rb_node, parent, p);
 420         rb_insert_color(&he->rb_node, root);
 421 }
 422
 423 static void hists__compute_resort(struct hists *hists)
 424 {
 425         struct rb_root *root;
 426         struct rb_node *next;
 427
 428         if (sort__need_collapse)
 429                 root = &hists->entries_collapsed;
 430         else
 431                 root = hists->entries_in;
 432
 433         hists->entries = RB_ROOT;
 434         next = rb_first(root);
 435
 436         hists->nr_entries = 0;
 437         hists->stats.total_period = 0;
 438         hists__reset_col_len(hists);
 439
 440         while (next != NULL) {
 441                 struct hist_entry *he;
 442
 443                 he = rb_entry(next, struct hist_entry, rb_node_in);
 444                 next = rb_next(&he->rb_node_in);
 445
 446                 insert_hist_entry_by_compute(&hists->entries, he, compute);
 447                 hists__inc_nr_entries(hists, he);
 448         }
 449 }
 450
 451 static void hists__process(struct hists *old, struct hists *new)
 452 {
 453         hists__match(new, old);
 454
 455         if (show_baseline_only)
 456                 hists__baseline_only(new);
 457         else
 458                 hists__link(new, old);
 459
 460         if (sort_compute) {
 461                 hists__precompute(new);
 462                 hists__compute_resort(new);
 463         } else {
 464                 hists__output_resort(new);
 465         }
 466
 467         hists__fprintf(new, true, 0, 0, 0, stdout);
 468 }
 469
 470 static int __cmd_diff(void)
 471 {
 472         int ret, i;
 473 #define older (session[0])
 474 #define newer (session[1])
 475         struct perf_session *session[2];
 476         struct perf_evlist *evlist_new, *evlist_old;
 477         struct perf_evsel *evsel;
 478         bool first = true;
 479
 480         older = perf_session__new(input_old, O_RDONLY, force, false,
 481                                   &tool);
 482         newer = perf_session__new(input_new, O_RDONLY, force, false,
 483                                   &tool);
 484         if (session[0] == NULL || session[1] == NULL)
 485                 return -ENOMEM;
 486
 487         for (i = 0; i < 2; ++i) {
 488                 ret = perf_session__process_events(session[i], &tool);
 489                 if (ret)
 490                         goto out_delete;
 491         }
 492
 493         evlist_old = older->evlist;
 494         evlist_new = newer->evlist;
 495
 496         perf_evlist__collapse_resort(evlist_old);
 497         perf_evlist__collapse_resort(evlist_new);
 498
 499         list_for_each_entry(evsel, &evlist_new->entries, node) {
 500                 struct perf_evsel *evsel_old;
 501
 502                 evsel_old = evsel_match(evsel, evlist_old);
 503                 if (!evsel_old)
 504                         continue;
 505
 506                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 507                         perf_evsel__name(evsel));
 508
 509                 first = false;
 510
 511                 hists__process(&evsel_old->hists, &evsel->hists);
 512         }
 513
 514 out_delete:
 515         for (i = 0; i < 2; ++i)
 516                 perf_session__delete(session[i]);
 517         return ret;
 518 #undef older
 519 #undef newer
 520 }
 521
 522 static const char * const diff_usage[] = {
 523         "perf diff [<options>] [old_file] [new_file]",
 524         NULL,
 525 };
 526
 527 static const struct option options[] = {
 528         OPT_INCR('v', "verbose", &verbose,
 529                     "be more verbose (show symbol address, etc)"),
 530         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 531                     "Show only items with match in baseline"),
 532         OPT_CALLBACK('c', "compute", &compute,
 533                      "delta,ratio,wdiff:w1,w2 (default delta)",
 534                      "Entries differential computation selection",
 535                      setup_compute),
 536         OPT_BOOLEAN('p', "period", &show_period,
 537                     "Show period values."),
 538         OPT_BOOLEAN('F', "formula", &show_formula,
 539                     "Show formula."),
 540         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 541                     "dump raw trace in ASCII"),
 542         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 543         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 544                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 545         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 546                    "only consider symbols in these dsos"),
 547         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 548                    "only consider symbols in these comms"),
 549         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 550                    "only consider these symbols"),
 551         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 552                    "sort by key(s): pid, comm, dso, symbol, parent"),
 553         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 554                    "separator for columns, no spaces will be added between "
 555                    "columns '.' is reserved."),
 556         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 557                     "Look for files with symbols relative to this directory"),
 558         OPT_END()
 559 };
 560
 561 static void ui_init(void)
 562 {
 563         /*
 564          * Display baseline/delta/ratio
 565          * formula/periods columns.
 566          */
 567         perf_hpp__column_enable(PERF_HPP__BASELINE);
 568
 569         switch (compute) {
 570         case COMPUTE_DELTA:
 571                 perf_hpp__column_enable(PERF_HPP__DELTA);
 572                 break;
 573         case COMPUTE_RATIO:
 574                 perf_hpp__column_enable(PERF_HPP__RATIO);
 575                 break;
 576         case COMPUTE_WEIGHTED_DIFF:
 577                 perf_hpp__column_enable(PERF_HPP__WEIGHTED_DIFF);
 578                 break;
 579         default:
 580                 BUG_ON(1);
 581         };
 582
 583         if (show_formula)
 584                 perf_hpp__column_enable(PERF_HPP__FORMULA);
 585
 586         if (show_period) {
 587                 perf_hpp__column_enable(PERF_HPP__PERIOD);
 588                 perf_hpp__column_enable(PERF_HPP__PERIOD_BASELINE);
 589         }
 590 }
 591
 592 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
 593 {
 594         sort_order = diff__default_sort_order;
 595         argc = parse_options(argc, argv, options, diff_usage, 0);
 596         if (argc) {
 597                 if (argc > 2)
 598                         usage_with_options(diff_usage, options);
 599                 if (argc == 2) {
 600                         input_old = argv[0];
 601                         input_new = argv[1];
 602                 } else
 603                         input_new = argv[0];
 604         } else if (symbol_conf.default_guest_vmlinux_name ||
 605                    symbol_conf.default_guest_kallsyms) {
 606                 input_old = "perf.data.host";
 607                 input_new = "perf.data.guest";
 608         }
 609
 610         symbol_conf.exclude_other = false;
 611         if (symbol__init() < 0)
 612                 return -1;
 613
 614         ui_init();
 615
 616         if (setup_sorting() < 0)
 617                 usage_with_options(diff_usage, options);
 618
 619         setup_pager();
 620
 621         sort__setup_elide(NULL);
 622
 623         return __cmd_diff();
 624 }