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 #include "util/data.h"
  20
  21 #include <stdlib.h>
  22 #include <math.h>
  23
  24 /* Diff command specific HPP columns. */
  25 enum {
  26         PERF_HPP_DIFF__BASELINE,
  27         PERF_HPP_DIFF__PERIOD,
  28         PERF_HPP_DIFF__PERIOD_BASELINE,
  29         PERF_HPP_DIFF__DELTA,
  30         PERF_HPP_DIFF__RATIO,
  31         PERF_HPP_DIFF__WEIGHTED_DIFF,
  32         PERF_HPP_DIFF__FORMULA,
  33
  34         PERF_HPP_DIFF__MAX_INDEX
  35 };
  36
  37 struct diff_hpp_fmt {
  38         struct perf_hpp_fmt      fmt;
  39         int                      idx;
  40         char                    *header;
  41         int                      header_width;
  42 };
  43
  44 struct data__file {
  45         struct perf_session     *session;
  46         struct perf_data_file   file;
  47         int                      idx;
  48         struct hists            *hists;
  49         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
  50 };
  51
  52 static struct data__file *data__files;
  53 static int data__files_cnt;
  54
  55 #define data__for_each_file_start(i, d, s)      \
  56         for (i = s, d = &data__files[s];        \
  57              i < data__files_cnt;               \
  58              i++, d = &data__files[i])
  59
  60 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  61 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  62
  63 static bool force;
  64 static bool show_period;
  65 static bool show_formula;
  66 static bool show_baseline_only;
  67 static unsigned int sort_compute;
  68
  69 static s64 compute_wdiff_w1;
  70 static s64 compute_wdiff_w2;
  71
  72 enum {
  73         COMPUTE_DELTA,
  74         COMPUTE_RATIO,
  75         COMPUTE_WEIGHTED_DIFF,
  76         COMPUTE_MAX,
  77 };
  78
  79 const char *compute_names[COMPUTE_MAX] = {
  80         [COMPUTE_DELTA] = "delta",
  81         [COMPUTE_RATIO] = "ratio",
  82         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
  83 };
  84
  85 static int compute;
  86
  87 static int compute_2_hpp[COMPUTE_MAX] = {
  88         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
  89         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
  90         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
  91 };
  92
  93 #define MAX_COL_WIDTH 70
  94
  95 static struct header_column {
  96         const char *name;
  97         int width;
  98 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
  99         [PERF_HPP_DIFF__BASELINE] = {
 100                 .name  = "Baseline",
 101         },
 102         [PERF_HPP_DIFF__PERIOD] = {
 103                 .name  = "Period",
 104                 .width = 14,
 105         },
 106         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 107                 .name  = "Base period",
 108                 .width = 14,
 109         },
 110         [PERF_HPP_DIFF__DELTA] = {
 111                 .name  = "Delta",
 112                 .width = 7,
 113         },
 114         [PERF_HPP_DIFF__RATIO] = {
 115                 .name  = "Ratio",
 116                 .width = 14,
 117         },
 118         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 119                 .name  = "Weighted diff",
 120                 .width = 14,
 121         },
 122         [PERF_HPP_DIFF__FORMULA] = {
 123                 .name  = "Formula",
 124                 .width = MAX_COL_WIDTH,
 125         }
 126 };
 127
 128 static int setup_compute_opt_wdiff(char *opt)
 129 {
 130         char *w1_str = opt;
 131         char *w2_str;
 132
 133         int ret = -EINVAL;
 134
 135         if (!opt)
 136                 goto out;
 137
 138         w2_str = strchr(opt, ',');
 139         if (!w2_str)
 140                 goto out;
 141
 142         *w2_str++ = 0x0;
 143         if (!*w2_str)
 144                 goto out;
 145
 146         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 147         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 148
 149         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 150                 goto out;
 151
 152         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 153                   compute_wdiff_w1, compute_wdiff_w2);
 154
 155         ret = 0;
 156
 157  out:
 158         if (ret)
 159                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 160
 161         return ret;
 162 }
 163
 164 static int setup_compute_opt(char *opt)
 165 {
 166         if (compute == COMPUTE_WEIGHTED_DIFF)
 167                 return setup_compute_opt_wdiff(opt);
 168
 169         if (opt) {
 170                 pr_err("Failed: extra option specified '%s'", opt);
 171                 return -EINVAL;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int setup_compute(const struct option *opt, const char *str,
 178                          int unset __maybe_unused)
 179 {
 180         int *cp = (int *) opt->value;
 181         char *cstr = (char *) str;
 182         char buf[50];
 183         unsigned i;
 184         char *option;
 185
 186         if (!str) {
 187                 *cp = COMPUTE_DELTA;
 188                 return 0;
 189         }
 190
 191         option = strchr(str, ':');
 192         if (option) {
 193                 unsigned len = option++ - str;
 194
 195                 /*
 196                  * The str data are not writeable, so we need
 197                  * to use another buffer.
 198                  */
 199
 200                 /* No option value is longer. */
 201                 if (len >= sizeof(buf))
 202                         return -EINVAL;
 203
 204                 strncpy(buf, str, len);
 205                 buf[len] = 0x0;
 206                 cstr = buf;
 207         }
 208
 209         for (i = 0; i < COMPUTE_MAX; i++)
 210                 if (!strcmp(cstr, compute_names[i])) {
 211                         *cp = i;
 212                         return setup_compute_opt(option);
 213                 }
 214
 215         pr_err("Failed: '%s' is not computation method "
 216                "(use 'delta','ratio' or 'wdiff')\n", str);
 217         return -EINVAL;
 218 }
 219
 220 static double period_percent(struct hist_entry *he, u64 period)
 221 {
 222         u64 total = hists__total_period(he->hists);
 223
 224         return (period * 100.0) / total;
 225 }
 226
 227 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 228 {
 229         double old_percent = period_percent(he, he->stat.period);
 230         double new_percent = period_percent(pair, pair->stat.period);
 231
 232         pair->diff.period_ratio_delta = new_percent - old_percent;
 233         pair->diff.computed = true;
 234         return pair->diff.period_ratio_delta;
 235 }
 236
 237 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 238 {
 239         double old_period = he->stat.period ?: 1;
 240         double new_period = pair->stat.period;
 241
 242         pair->diff.computed = true;
 243         pair->diff.period_ratio = new_period / old_period;
 244         return pair->diff.period_ratio;
 245 }
 246
 247 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 248 {
 249         u64 old_period = he->stat.period;
 250         u64 new_period = pair->stat.period;
 251
 252         pair->diff.computed = true;
 253         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 254                            old_period * compute_wdiff_w1;
 255
 256         return pair->diff.wdiff;
 257 }
 258
 259 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 260                          char *buf, size_t size)
 261 {
 262         u64 he_total = he->hists->stats.total_period;
 263         u64 pair_total = pair->hists->stats.total_period;
 264
 265         if (symbol_conf.filter_relative) {
 266                 he_total = he->hists->stats.total_non_filtered_period;
 267                 pair_total = pair->hists->stats.total_non_filtered_period;
 268         }
 269         return scnprintf(buf, size,
 270                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 271                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 272                          pair->stat.period, pair_total,
 273                          he->stat.period, he_total);
 274 }
 275
 276 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 277                          char *buf, size_t size)
 278 {
 279         double old_period = he->stat.period;
 280         double new_period = pair->stat.period;
 281
 282         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 283 }
 284
 285 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 286                          char *buf, size_t size)
 287 {
 288         u64 old_period = he->stat.period;
 289         u64 new_period = pair->stat.period;
 290
 291         return scnprintf(buf, size,
 292                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 293                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 294 }
 295
 296 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 297                            char *buf, size_t size)
 298 {
 299         switch (compute) {
 300         case COMPUTE_DELTA:
 301                 return formula_delta(he, pair, buf, size);
 302         case COMPUTE_RATIO:
 303                 return formula_ratio(he, pair, buf, size);
 304         case COMPUTE_WEIGHTED_DIFF:
 305                 return formula_wdiff(he, pair, buf, size);
 306         default:
 307                 BUG_ON(1);
 308         }
 309
 310         return -1;
 311 }
 312
 313 static int hists__add_entry(struct hists *hists,
 314                             struct addr_location *al, u64 period,
 315                             u64 weight, u64 transaction)
 316 {
 317         if (__hists__add_entry(hists, al, NULL, NULL, NULL, period, weight,
 318                                transaction, true) != NULL)
 319                 return 0;
 320         return -ENOMEM;
 321 }
 322
 323 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
 324                                       union perf_event *event,
 325                                       struct perf_sample *sample,
 326                                       struct perf_evsel *evsel,
 327                                       struct machine *machine)
 328 {
 329         struct addr_location al;
 330         struct hists *hists = evsel__hists(evsel);
 331
 332         if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
 333                 pr_warning("problem processing %d event, skipping it.\n",
 334                            event->header.type);
 335                 return -1;
 336         }
 337
 338         if (hists__add_entry(hists, &al, sample->period,
 339                              sample->weight, sample->transaction)) {
 340                 pr_warning("problem incrementing symbol period, skipping event\n");
 341                 return -1;
 342         }
 343
 344         /*
 345          * The total_period is updated here before going to the output
 346          * tree since normally only the baseline hists will call
 347          * hists__output_resort() and precompute needs the total
 348          * period in order to sort entries by percentage delta.
 349          */
 350         hists->stats.total_period += sample->period;
 351         if (!al.filtered)
 352                 hists->stats.total_non_filtered_period += sample->period;
 353
 354         return 0;
 355 }
 356
 357 static struct perf_tool tool = {
 358         .sample = diff__process_sample_event,
 359         .mmap   = perf_event__process_mmap,
 360         .mmap2  = perf_event__process_mmap2,
 361         .comm   = perf_event__process_comm,
 362         .exit   = perf_event__process_exit,
 363         .fork   = perf_event__process_fork,
 364         .lost   = perf_event__process_lost,
 365         .ordered_events = true,
 366         .ordering_requires_timestamps = true,
 367 };
 368
 369 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 370                                       struct perf_evlist *evlist)
 371 {
 372         struct perf_evsel *e;
 373
 374         evlist__for_each(evlist, e) {
 375                 if (perf_evsel__match2(evsel, e))
 376                         return e;
 377         }
 378
 379         return NULL;
 380 }
 381
 382 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 383 {
 384         struct perf_evsel *evsel;
 385
 386         evlist__for_each(evlist, evsel) {
 387                 struct hists *hists = evsel__hists(evsel);
 388
 389                 hists__collapse_resort(hists, NULL);
 390         }
 391 }
 392
 393 static struct hist_entry*
 394 get_pair_data(struct hist_entry *he, struct data__file *d)
 395 {
 396         if (hist_entry__has_pairs(he)) {
 397                 struct hist_entry *pair;
 398
 399                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 400                         if (pair->hists == d->hists)
 401                                 return pair;
 402         }
 403
 404         return NULL;
 405 }
 406
 407 static struct hist_entry*
 408 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 409 {
 410         void *ptr = dfmt - dfmt->idx;
 411         struct data__file *d = container_of(ptr, struct data__file, fmt);
 412
 413         return get_pair_data(he, d);
 414 }
 415
 416 static void hists__baseline_only(struct hists *hists)
 417 {
 418         struct rb_root *root;
 419         struct rb_node *next;
 420
 421         if (sort__need_collapse)
 422                 root = &hists->entries_collapsed;
 423         else
 424                 root = hists->entries_in;
 425
 426         next = rb_first(root);
 427         while (next != NULL) {
 428                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 429
 430                 next = rb_next(&he->rb_node_in);
 431                 if (!hist_entry__next_pair(he)) {
 432                         rb_erase(&he->rb_node_in, root);
 433                         hist_entry__free(he);
 434                 }
 435         }
 436 }
 437
 438 static void hists__precompute(struct hists *hists)
 439 {
 440         struct rb_root *root;
 441         struct rb_node *next;
 442
 443         if (sort__need_collapse)
 444                 root = &hists->entries_collapsed;
 445         else
 446                 root = hists->entries_in;
 447
 448         next = rb_first(root);
 449         while (next != NULL) {
 450                 struct hist_entry *he, *pair;
 451
 452                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 453                 next = rb_next(&he->rb_node_in);
 454
 455                 pair = get_pair_data(he, &data__files[sort_compute]);
 456                 if (!pair)
 457                         continue;
 458
 459                 switch (compute) {
 460                 case COMPUTE_DELTA:
 461                         compute_delta(he, pair);
 462                         break;
 463                 case COMPUTE_RATIO:
 464                         compute_ratio(he, pair);
 465                         break;
 466                 case COMPUTE_WEIGHTED_DIFF:
 467                         compute_wdiff(he, pair);
 468                         break;
 469                 default:
 470                         BUG_ON(1);
 471                 }
 472         }
 473 }
 474
 475 static int64_t cmp_doubles(double l, double r)
 476 {
 477         if (l > r)
 478                 return -1;
 479         else if (l < r)
 480                 return 1;
 481         else
 482                 return 0;
 483 }
 484
 485 static int64_t
 486 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 487                         int c)
 488 {
 489         switch (c) {
 490         case COMPUTE_DELTA:
 491         {
 492                 double l = left->diff.period_ratio_delta;
 493                 double r = right->diff.period_ratio_delta;
 494
 495                 return cmp_doubles(l, r);
 496         }
 497         case COMPUTE_RATIO:
 498         {
 499                 double l = left->diff.period_ratio;
 500                 double r = right->diff.period_ratio;
 501
 502                 return cmp_doubles(l, r);
 503         }
 504         case COMPUTE_WEIGHTED_DIFF:
 505         {
 506                 s64 l = left->diff.wdiff;
 507                 s64 r = right->diff.wdiff;
 508
 509                 return r - l;
 510         }
 511         default:
 512                 BUG_ON(1);
 513         }
 514
 515         return 0;
 516 }
 517
 518 static int64_t
 519 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 520                         int c)
 521 {
 522         bool pairs_left  = hist_entry__has_pairs(left);
 523         bool pairs_right = hist_entry__has_pairs(right);
 524         struct hist_entry *p_right, *p_left;
 525
 526         if (!pairs_left && !pairs_right)
 527                 return 0;
 528
 529         if (!pairs_left || !pairs_right)
 530                 return pairs_left ? -1 : 1;
 531
 532         p_left  = get_pair_data(left,  &data__files[sort_compute]);
 533         p_right = get_pair_data(right, &data__files[sort_compute]);
 534
 535         if (!p_left && !p_right)
 536                 return 0;
 537
 538         if (!p_left || !p_right)
 539                 return p_left ? -1 : 1;
 540
 541         /*
 542          * We have 2 entries of same kind, let's
 543          * make the data comparison.
 544          */
 545         return __hist_entry__cmp_compute(p_left, p_right, c);
 546 }
 547
 548 static void insert_hist_entry_by_compute(struct rb_root *root,
 549                                          struct hist_entry *he,
 550                                          int c)
 551 {
 552         struct rb_node **p = &root->rb_node;
 553         struct rb_node *parent = NULL;
 554         struct hist_entry *iter;
 555
 556         while (*p != NULL) {
 557                 parent = *p;
 558                 iter = rb_entry(parent, struct hist_entry, rb_node);
 559                 if (hist_entry__cmp_compute(he, iter, c) < 0)
 560                         p = &(*p)->rb_left;
 561                 else
 562                         p = &(*p)->rb_right;
 563         }
 564
 565         rb_link_node(&he->rb_node, parent, p);
 566         rb_insert_color(&he->rb_node, root);
 567 }
 568
 569 static void hists__compute_resort(struct hists *hists)
 570 {
 571         struct rb_root *root;
 572         struct rb_node *next;
 573
 574         if (sort__need_collapse)
 575                 root = &hists->entries_collapsed;
 576         else
 577                 root = hists->entries_in;
 578
 579         hists->entries = RB_ROOT;
 580         next = rb_first(root);
 581
 582         hists__reset_stats(hists);
 583         hists__reset_col_len(hists);
 584
 585         while (next != NULL) {
 586                 struct hist_entry *he;
 587
 588                 he = rb_entry(next, struct hist_entry, rb_node_in);
 589                 next = rb_next(&he->rb_node_in);
 590
 591                 insert_hist_entry_by_compute(&hists->entries, he, compute);
 592                 hists__inc_stats(hists, he);
 593
 594                 if (!he->filtered)
 595                         hists__calc_col_len(hists, he);
 596         }
 597 }
 598
 599 static void hists__process(struct hists *hists)
 600 {
 601         if (show_baseline_only)
 602                 hists__baseline_only(hists);
 603
 604         if (sort_compute) {
 605                 hists__precompute(hists);
 606                 hists__compute_resort(hists);
 607         } else {
 608                 hists__output_resort(hists, NULL);
 609         }
 610
 611         hists__fprintf(hists, true, 0, 0, 0, stdout);
 612 }
 613
 614 static void data__fprintf(void)
 615 {
 616         struct data__file *d;
 617         int i;
 618
 619         fprintf(stdout, "# Data files:\n");
 620
 621         data__for_each_file(i, d)
 622                 fprintf(stdout, "#  [%d] %s %s\n",
 623                         d->idx, d->file.path,
 624                         !d->idx ? "(Baseline)" : "");
 625
 626         fprintf(stdout, "#\n");
 627 }
 628
 629 static void data_process(void)
 630 {
 631         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 632         struct perf_evsel *evsel_base;
 633         bool first = true;
 634
 635         evlist__for_each(evlist_base, evsel_base) {
 636                 struct hists *hists_base = evsel__hists(evsel_base);
 637                 struct data__file *d;
 638                 int i;
 639
 640                 data__for_each_file_new(i, d) {
 641                         struct perf_evlist *evlist = d->session->evlist;
 642                         struct perf_evsel *evsel;
 643                         struct hists *hists;
 644
 645                         evsel = evsel_match(evsel_base, evlist);
 646                         if (!evsel)
 647                                 continue;
 648
 649                         hists = evsel__hists(evsel);
 650                         d->hists = hists;
 651
 652                         hists__match(hists_base, hists);
 653
 654                         if (!show_baseline_only)
 655                                 hists__link(hists_base, hists);
 656                 }
 657
 658                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 659                         perf_evsel__name(evsel_base));
 660
 661                 first = false;
 662
 663                 if (verbose || data__files_cnt > 2)
 664                         data__fprintf();
 665
 666                 hists__process(hists_base);
 667         }
 668 }
 669
 670 static void data__free(struct data__file *d)
 671 {
 672         int col;
 673
 674         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 675                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 676
 677                 zfree(&fmt->header);
 678         }
 679 }
 680
 681 static int __cmd_diff(void)
 682 {
 683         struct data__file *d;
 684         int ret = -EINVAL, i;
 685
 686         data__for_each_file(i, d) {
 687                 d->session = perf_session__new(&d->file, false, &tool);
 688                 if (!d->session) {
 689                         pr_err("Failed to open %s\n", d->file.path);
 690                         ret = -1;
 691                         goto out_delete;
 692                 }
 693
 694                 ret = perf_session__process_events(d->session, &tool);
 695                 if (ret) {
 696                         pr_err("Failed to process %s\n", d->file.path);
 697                         goto out_delete;
 698                 }
 699
 700                 perf_evlist__collapse_resort(d->session->evlist);
 701         }
 702
 703         data_process();
 704
 705  out_delete:
 706         data__for_each_file(i, d) {
 707                 if (d->session)
 708                         perf_session__delete(d->session);
 709
 710                 data__free(d);
 711         }
 712
 713         free(data__files);
 714         return ret;
 715 }
 716
 717 static const char * const diff_usage[] = {
 718         "perf diff [<options>] [old_file] [new_file]",
 719         NULL,
 720 };
 721
 722 static const struct option options[] = {
 723         OPT_INCR('v', "verbose", &verbose,
 724                     "be more verbose (show symbol address, etc)"),
 725         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 726                     "Show only items with match in baseline"),
 727         OPT_CALLBACK('c', "compute", &compute,
 728                      "delta,ratio,wdiff:w1,w2 (default delta)",
 729                      "Entries differential computation selection",
 730                      setup_compute),
 731         OPT_BOOLEAN('p', "period", &show_period,
 732                     "Show period values."),
 733         OPT_BOOLEAN('F', "formula", &show_formula,
 734                     "Show formula."),
 735         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 736                     "dump raw trace in ASCII"),
 737         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 738         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 739                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 740         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 741                    "only consider symbols in these dsos"),
 742         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 743                    "only consider symbols in these comms"),
 744         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 745                    "only consider these symbols"),
 746         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 747                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 748                    " Please refer the man page for the complete list."),
 749         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 750                    "separator for columns, no spaces will be added between "
 751                    "columns '.' is reserved."),
 752         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 753                     "Look for files with symbols relative to this directory"),
 754         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 755         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 756                      "How to display percentage of filtered entries", parse_filter_percentage),
 757         OPT_END()
 758 };
 759
 760 static double baseline_percent(struct hist_entry *he)
 761 {
 762         u64 total = hists__total_period(he->hists);
 763
 764         return 100.0 * he->stat.period / total;
 765 }
 766
 767 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 768                                struct perf_hpp *hpp, struct hist_entry *he)
 769 {
 770         struct diff_hpp_fmt *dfmt =
 771                 container_of(fmt, struct diff_hpp_fmt, fmt);
 772         double percent = baseline_percent(he);
 773         char pfmt[20] = " ";
 774
 775         if (!he->dummy) {
 776                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 777                 return percent_color_snprintf(hpp->buf, hpp->size,
 778                                               pfmt, percent);
 779         } else
 780                 return scnprintf(hpp->buf, hpp->size, "%*s",
 781                                  dfmt->header_width, pfmt);
 782 }
 783
 784 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 785 {
 786         double percent = baseline_percent(he);
 787         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 788         int ret = 0;
 789
 790         if (!he->dummy)
 791                 ret = scnprintf(buf, size, fmt, percent);
 792
 793         return ret;
 794 }
 795
 796 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 797                                 struct perf_hpp *hpp, struct hist_entry *he,
 798                                 int comparison_method)
 799 {
 800         struct diff_hpp_fmt *dfmt =
 801                 container_of(fmt, struct diff_hpp_fmt, fmt);
 802         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 803         double diff;
 804         s64 wdiff;
 805         char pfmt[20] = " ";
 806
 807         if (!pair)
 808                 goto dummy_print;
 809
 810         switch (comparison_method) {
 811         case COMPUTE_DELTA:
 812                 if (pair->diff.computed)
 813                         diff = pair->diff.period_ratio_delta;
 814                 else
 815                         diff = compute_delta(he, pair);
 816
 817                 if (fabs(diff) < 0.01)
 818                         goto dummy_print;
 819                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 820                 return percent_color_snprintf(hpp->buf, hpp->size,
 821                                         pfmt, diff);
 822         case COMPUTE_RATIO:
 823                 if (he->dummy)
 824                         goto dummy_print;
 825                 if (pair->diff.computed)
 826                         diff = pair->diff.period_ratio;
 827                 else
 828                         diff = compute_ratio(he, pair);
 829
 830                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 831                 return value_color_snprintf(hpp->buf, hpp->size,
 832                                         pfmt, diff);
 833         case COMPUTE_WEIGHTED_DIFF:
 834                 if (he->dummy)
 835                         goto dummy_print;
 836                 if (pair->diff.computed)
 837                         wdiff = pair->diff.wdiff;
 838                 else
 839                         wdiff = compute_wdiff(he, pair);
 840
 841                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 842                 return color_snprintf(hpp->buf, hpp->size,
 843                                 get_percent_color(wdiff),
 844                                 pfmt, wdiff);
 845         default:
 846                 BUG_ON(1);
 847         }
 848 dummy_print:
 849         return scnprintf(hpp->buf, hpp->size, "%*s",
 850                         dfmt->header_width, pfmt);
 851 }
 852
 853 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 854                         struct perf_hpp *hpp, struct hist_entry *he)
 855 {
 856         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 857 }
 858
 859 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 860                         struct perf_hpp *hpp, struct hist_entry *he)
 861 {
 862         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 863 }
 864
 865 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 866                         struct perf_hpp *hpp, struct hist_entry *he)
 867 {
 868         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 869 }
 870
 871 static void
 872 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 873 {
 874         switch (idx) {
 875         case PERF_HPP_DIFF__PERIOD_BASELINE:
 876                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 877                 break;
 878
 879         default:
 880                 break;
 881         }
 882 }
 883
 884 static void
 885 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 886                 int idx, char *buf, size_t size)
 887 {
 888         double diff;
 889         double ratio;
 890         s64 wdiff;
 891
 892         switch (idx) {
 893         case PERF_HPP_DIFF__DELTA:
 894                 if (pair->diff.computed)
 895                         diff = pair->diff.period_ratio_delta;
 896                 else
 897                         diff = compute_delta(he, pair);
 898
 899                 if (fabs(diff) >= 0.01)
 900                         scnprintf(buf, size, "%+4.2F%%", diff);
 901                 break;
 902
 903         case PERF_HPP_DIFF__RATIO:
 904                 /* No point for ratio number if we are dummy.. */
 905                 if (he->dummy)
 906                         break;
 907
 908                 if (pair->diff.computed)
 909                         ratio = pair->diff.period_ratio;
 910                 else
 911                         ratio = compute_ratio(he, pair);
 912
 913                 if (ratio > 0.0)
 914                         scnprintf(buf, size, "%14.6F", ratio);
 915                 break;
 916
 917         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 918                 /* No point for wdiff number if we are dummy.. */
 919                 if (he->dummy)
 920                         break;
 921
 922                 if (pair->diff.computed)
 923                         wdiff = pair->diff.wdiff;
 924                 else
 925                         wdiff = compute_wdiff(he, pair);
 926
 927                 if (wdiff != 0)
 928                         scnprintf(buf, size, "%14ld", wdiff);
 929                 break;
 930
 931         case PERF_HPP_DIFF__FORMULA:
 932                 formula_fprintf(he, pair, buf, size);
 933                 break;
 934
 935         case PERF_HPP_DIFF__PERIOD:
 936                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
 937                 break;
 938
 939         default:
 940                 BUG_ON(1);
 941         };
 942 }
 943
 944 static void
 945 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
 946                     char *buf, size_t size)
 947 {
 948         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 949         int idx = dfmt->idx;
 950
 951         /* baseline is special */
 952         if (idx == PERF_HPP_DIFF__BASELINE)
 953                 hpp__entry_baseline(he, buf, size);
 954         else {
 955                 if (pair)
 956                         hpp__entry_pair(he, pair, idx, buf, size);
 957                 else
 958                         hpp__entry_unpair(he, idx, buf, size);
 959         }
 960 }
 961
 962 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
 963                              struct hist_entry *he)
 964 {
 965         struct diff_hpp_fmt *dfmt =
 966                 container_of(_fmt, struct diff_hpp_fmt, fmt);
 967         char buf[MAX_COL_WIDTH] = " ";
 968
 969         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
 970
 971         if (symbol_conf.field_sep)
 972                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
 973         else
 974                 return scnprintf(hpp->buf, hpp->size, "%*s",
 975                                  dfmt->header_width, buf);
 976 }
 977
 978 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 979                        struct perf_evsel *evsel __maybe_unused)
 980 {
 981         struct diff_hpp_fmt *dfmt =
 982                 container_of(fmt, struct diff_hpp_fmt, fmt);
 983
 984         BUG_ON(!dfmt->header);
 985         return scnprintf(hpp->buf, hpp->size, dfmt->header);
 986 }
 987
 988 static int hpp__width(struct perf_hpp_fmt *fmt,
 989                       struct perf_hpp *hpp __maybe_unused,
 990                       struct perf_evsel *evsel __maybe_unused)
 991 {
 992         struct diff_hpp_fmt *dfmt =
 993                 container_of(fmt, struct diff_hpp_fmt, fmt);
 994
 995         BUG_ON(dfmt->header_width <= 0);
 996         return dfmt->header_width;
 997 }
 998
 999 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1000 {
1001 #define MAX_HEADER_NAME 100
1002         char buf_indent[MAX_HEADER_NAME];
1003         char buf[MAX_HEADER_NAME];
1004         const char *header = NULL;
1005         int width = 0;
1006
1007         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1008         header = columns[dfmt->idx].name;
1009         width  = columns[dfmt->idx].width;
1010
1011         /* Only our defined HPP fmts should appear here. */
1012         BUG_ON(!header);
1013
1014         if (data__files_cnt > 2)
1015                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1016
1017 #define NAME (data__files_cnt > 2 ? buf : header)
1018         dfmt->header_width = width;
1019         width = (int) strlen(NAME);
1020         if (dfmt->header_width < width)
1021                 dfmt->header_width = width;
1022
1023         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1024                   dfmt->header_width, NAME);
1025
1026         dfmt->header = strdup(buf_indent);
1027 #undef MAX_HEADER_NAME
1028 #undef NAME
1029 }
1030
1031 static void data__hpp_register(struct data__file *d, int idx)
1032 {
1033         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1034         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1035
1036         dfmt->idx = idx;
1037
1038         fmt->header = hpp__header;
1039         fmt->width  = hpp__width;
1040         fmt->entry  = hpp__entry_global;
1041
1042         /* TODO more colors */
1043         switch (idx) {
1044         case PERF_HPP_DIFF__BASELINE:
1045                 fmt->color = hpp__color_baseline;
1046                 break;
1047         case PERF_HPP_DIFF__DELTA:
1048                 fmt->color = hpp__color_delta;
1049                 break;
1050         case PERF_HPP_DIFF__RATIO:
1051                 fmt->color = hpp__color_ratio;
1052                 break;
1053         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1054                 fmt->color = hpp__color_wdiff;
1055                 break;
1056         default:
1057                 break;
1058         }
1059
1060         init_header(d, dfmt);
1061         perf_hpp__column_register(fmt);
1062 }
1063
1064 static void ui_init(void)
1065 {
1066         struct data__file *d;
1067         int i;
1068
1069         data__for_each_file(i, d) {
1070
1071                 /*
1072                  * Baseline or compute realted columns:
1073                  *
1074                  *   PERF_HPP_DIFF__BASELINE
1075                  *   PERF_HPP_DIFF__DELTA
1076                  *   PERF_HPP_DIFF__RATIO
1077                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1078                  */
1079                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1080                                           PERF_HPP_DIFF__BASELINE);
1081
1082                 /*
1083                  * And the rest:
1084                  *
1085                  * PERF_HPP_DIFF__FORMULA
1086                  * PERF_HPP_DIFF__PERIOD
1087                  * PERF_HPP_DIFF__PERIOD_BASELINE
1088                  */
1089                 if (show_formula && i)
1090                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1091
1092                 if (show_period)
1093                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1094                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1095         }
1096 }
1097
1098 static int data_init(int argc, const char **argv)
1099 {
1100         struct data__file *d;
1101         static const char *defaults[] = {
1102                 "perf.data.old",
1103                 "perf.data",
1104         };
1105         bool use_default = true;
1106         int i;
1107
1108         data__files_cnt = 2;
1109
1110         if (argc) {
1111                 if (argc == 1)
1112                         defaults[1] = argv[0];
1113                 else {
1114                         data__files_cnt = argc;
1115                         use_default = false;
1116                 }
1117         } else if (perf_guest) {
1118                 defaults[0] = "perf.data.host";
1119                 defaults[1] = "perf.data.guest";
1120         }
1121
1122         if (sort_compute >= (unsigned int) data__files_cnt) {
1123                 pr_err("Order option out of limit.\n");
1124                 return -EINVAL;
1125         }
1126
1127         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1128         if (!data__files)
1129                 return -ENOMEM;
1130
1131         data__for_each_file(i, d) {
1132                 struct perf_data_file *file = &d->file;
1133
1134                 file->path  = use_default ? defaults[i] : argv[i];
1135                 file->mode  = PERF_DATA_MODE_READ,
1136                 file->force = force,
1137
1138                 d->idx  = i;
1139         }
1140
1141         return 0;
1142 }
1143
1144 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1145 {
1146         int ret = hists__init();
1147
1148         if (ret < 0)
1149                 return ret;
1150
1151         perf_config(perf_default_config, NULL);
1152
1153         argc = parse_options(argc, argv, options, diff_usage, 0);
1154
1155         if (symbol__init(NULL) < 0)
1156                 return -1;
1157
1158         if (data_init(argc, argv) < 0)
1159                 return -1;
1160
1161         ui_init();
1162
1163         sort__mode = SORT_MODE__DIFF;
1164
1165         if (setup_sorting() < 0)
1166                 usage_with_options(diff_usage, options);
1167
1168         setup_pager();
1169
1170         sort__setup_elide(NULL);
1171
1172         return __cmd_diff();
1173 }