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 int64_t
 549 hist_entry__cmp_nop(struct hist_entry *left __maybe_unused,
 550                     struct hist_entry *right __maybe_unused)
 551 {
 552         return 0;
 553 }
 554
 555 static int64_t
 556 hist_entry__cmp_baseline(struct hist_entry *left, struct hist_entry *right)
 557 {
 558         if (sort_compute)
 559                 return 0;
 560
 561         if (left->stat.period == right->stat.period)
 562                 return 0;
 563         return left->stat.period > right->stat.period ? 1 : -1;
 564 }
 565
 566 static int64_t
 567 hist_entry__cmp_delta(struct hist_entry *left, struct hist_entry *right)
 568 {
 569         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA);
 570 }
 571
 572 static int64_t
 573 hist_entry__cmp_ratio(struct hist_entry *left, struct hist_entry *right)
 574 {
 575         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO);
 576 }
 577
 578 static int64_t
 579 hist_entry__cmp_wdiff(struct hist_entry *left, struct hist_entry *right)
 580 {
 581         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF);
 582 }
 583
 584 static void insert_hist_entry_by_compute(struct rb_root *root,
 585                                          struct hist_entry *he,
 586                                          int c)
 587 {
 588         struct rb_node **p = &root->rb_node;
 589         struct rb_node *parent = NULL;
 590         struct hist_entry *iter;
 591
 592         while (*p != NULL) {
 593                 parent = *p;
 594                 iter = rb_entry(parent, struct hist_entry, rb_node);
 595                 if (hist_entry__cmp_compute(he, iter, c) < 0)
 596                         p = &(*p)->rb_left;
 597                 else
 598                         p = &(*p)->rb_right;
 599         }
 600
 601         rb_link_node(&he->rb_node, parent, p);
 602         rb_insert_color(&he->rb_node, root);
 603 }
 604
 605 static void hists__compute_resort(struct hists *hists)
 606 {
 607         struct rb_root *root;
 608         struct rb_node *next;
 609
 610         if (sort__need_collapse)
 611                 root = &hists->entries_collapsed;
 612         else
 613                 root = hists->entries_in;
 614
 615         hists->entries = RB_ROOT;
 616         next = rb_first(root);
 617
 618         hists__reset_stats(hists);
 619         hists__reset_col_len(hists);
 620
 621         while (next != NULL) {
 622                 struct hist_entry *he;
 623
 624                 he = rb_entry(next, struct hist_entry, rb_node_in);
 625                 next = rb_next(&he->rb_node_in);
 626
 627                 insert_hist_entry_by_compute(&hists->entries, he, compute);
 628                 hists__inc_stats(hists, he);
 629
 630                 if (!he->filtered)
 631                         hists__calc_col_len(hists, he);
 632         }
 633 }
 634
 635 static void hists__process(struct hists *hists)
 636 {
 637         if (show_baseline_only)
 638                 hists__baseline_only(hists);
 639
 640         if (sort_compute) {
 641                 hists__precompute(hists);
 642                 hists__compute_resort(hists);
 643         } else {
 644                 hists__output_resort(hists, NULL);
 645         }
 646
 647         hists__fprintf(hists, true, 0, 0, 0, stdout);
 648 }
 649
 650 static void data__fprintf(void)
 651 {
 652         struct data__file *d;
 653         int i;
 654
 655         fprintf(stdout, "# Data files:\n");
 656
 657         data__for_each_file(i, d)
 658                 fprintf(stdout, "#  [%d] %s %s\n",
 659                         d->idx, d->file.path,
 660                         !d->idx ? "(Baseline)" : "");
 661
 662         fprintf(stdout, "#\n");
 663 }
 664
 665 static void data_process(void)
 666 {
 667         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 668         struct perf_evsel *evsel_base;
 669         bool first = true;
 670
 671         evlist__for_each(evlist_base, evsel_base) {
 672                 struct hists *hists_base = evsel__hists(evsel_base);
 673                 struct data__file *d;
 674                 int i;
 675
 676                 data__for_each_file_new(i, d) {
 677                         struct perf_evlist *evlist = d->session->evlist;
 678                         struct perf_evsel *evsel;
 679                         struct hists *hists;
 680
 681                         evsel = evsel_match(evsel_base, evlist);
 682                         if (!evsel)
 683                                 continue;
 684
 685                         hists = evsel__hists(evsel);
 686                         d->hists = hists;
 687
 688                         hists__match(hists_base, hists);
 689
 690                         if (!show_baseline_only)
 691                                 hists__link(hists_base, hists);
 692                 }
 693
 694                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 695                         perf_evsel__name(evsel_base));
 696
 697                 first = false;
 698
 699                 if (verbose || data__files_cnt > 2)
 700                         data__fprintf();
 701
 702                 hists__process(hists_base);
 703         }
 704 }
 705
 706 static void data__free(struct data__file *d)
 707 {
 708         int col;
 709
 710         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 711                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 712
 713                 zfree(&fmt->header);
 714         }
 715 }
 716
 717 static int __cmd_diff(void)
 718 {
 719         struct data__file *d;
 720         int ret = -EINVAL, i;
 721
 722         data__for_each_file(i, d) {
 723                 d->session = perf_session__new(&d->file, false, &tool);
 724                 if (!d->session) {
 725                         pr_err("Failed to open %s\n", d->file.path);
 726                         ret = -1;
 727                         goto out_delete;
 728                 }
 729
 730                 ret = perf_session__process_events(d->session, &tool);
 731                 if (ret) {
 732                         pr_err("Failed to process %s\n", d->file.path);
 733                         goto out_delete;
 734                 }
 735
 736                 perf_evlist__collapse_resort(d->session->evlist);
 737         }
 738
 739         data_process();
 740
 741  out_delete:
 742         data__for_each_file(i, d) {
 743                 if (d->session)
 744                         perf_session__delete(d->session);
 745
 746                 data__free(d);
 747         }
 748
 749         free(data__files);
 750         return ret;
 751 }
 752
 753 static const char * const diff_usage[] = {
 754         "perf diff [<options>] [old_file] [new_file]",
 755         NULL,
 756 };
 757
 758 static const struct option options[] = {
 759         OPT_INCR('v', "verbose", &verbose,
 760                     "be more verbose (show symbol address, etc)"),
 761         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 762                     "Show only items with match in baseline"),
 763         OPT_CALLBACK('c', "compute", &compute,
 764                      "delta,ratio,wdiff:w1,w2 (default delta)",
 765                      "Entries differential computation selection",
 766                      setup_compute),
 767         OPT_BOOLEAN('p', "period", &show_period,
 768                     "Show period values."),
 769         OPT_BOOLEAN('F', "formula", &show_formula,
 770                     "Show formula."),
 771         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 772                     "dump raw trace in ASCII"),
 773         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 774         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 775                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 776         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 777                    "only consider symbols in these dsos"),
 778         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 779                    "only consider symbols in these comms"),
 780         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 781                    "only consider these symbols"),
 782         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 783                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 784                    " Please refer the man page for the complete list."),
 785         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 786                    "separator for columns, no spaces will be added between "
 787                    "columns '.' is reserved."),
 788         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 789                     "Look for files with symbols relative to this directory"),
 790         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 791         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 792                      "How to display percentage of filtered entries", parse_filter_percentage),
 793         OPT_END()
 794 };
 795
 796 static double baseline_percent(struct hist_entry *he)
 797 {
 798         u64 total = hists__total_period(he->hists);
 799
 800         return 100.0 * he->stat.period / total;
 801 }
 802
 803 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 804                                struct perf_hpp *hpp, struct hist_entry *he)
 805 {
 806         struct diff_hpp_fmt *dfmt =
 807                 container_of(fmt, struct diff_hpp_fmt, fmt);
 808         double percent = baseline_percent(he);
 809         char pfmt[20] = " ";
 810
 811         if (!he->dummy) {
 812                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 813                 return percent_color_snprintf(hpp->buf, hpp->size,
 814                                               pfmt, percent);
 815         } else
 816                 return scnprintf(hpp->buf, hpp->size, "%*s",
 817                                  dfmt->header_width, pfmt);
 818 }
 819
 820 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 821 {
 822         double percent = baseline_percent(he);
 823         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 824         int ret = 0;
 825
 826         if (!he->dummy)
 827                 ret = scnprintf(buf, size, fmt, percent);
 828
 829         return ret;
 830 }
 831
 832 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 833                                 struct perf_hpp *hpp, struct hist_entry *he,
 834                                 int comparison_method)
 835 {
 836         struct diff_hpp_fmt *dfmt =
 837                 container_of(fmt, struct diff_hpp_fmt, fmt);
 838         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 839         double diff;
 840         s64 wdiff;
 841         char pfmt[20] = " ";
 842
 843         if (!pair)
 844                 goto dummy_print;
 845
 846         switch (comparison_method) {
 847         case COMPUTE_DELTA:
 848                 if (pair->diff.computed)
 849                         diff = pair->diff.period_ratio_delta;
 850                 else
 851                         diff = compute_delta(he, pair);
 852
 853                 if (fabs(diff) < 0.01)
 854                         goto dummy_print;
 855                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 856                 return percent_color_snprintf(hpp->buf, hpp->size,
 857                                         pfmt, diff);
 858         case COMPUTE_RATIO:
 859                 if (he->dummy)
 860                         goto dummy_print;
 861                 if (pair->diff.computed)
 862                         diff = pair->diff.period_ratio;
 863                 else
 864                         diff = compute_ratio(he, pair);
 865
 866                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 867                 return value_color_snprintf(hpp->buf, hpp->size,
 868                                         pfmt, diff);
 869         case COMPUTE_WEIGHTED_DIFF:
 870                 if (he->dummy)
 871                         goto dummy_print;
 872                 if (pair->diff.computed)
 873                         wdiff = pair->diff.wdiff;
 874                 else
 875                         wdiff = compute_wdiff(he, pair);
 876
 877                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 878                 return color_snprintf(hpp->buf, hpp->size,
 879                                 get_percent_color(wdiff),
 880                                 pfmt, wdiff);
 881         default:
 882                 BUG_ON(1);
 883         }
 884 dummy_print:
 885         return scnprintf(hpp->buf, hpp->size, "%*s",
 886                         dfmt->header_width, pfmt);
 887 }
 888
 889 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 890                         struct perf_hpp *hpp, struct hist_entry *he)
 891 {
 892         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 893 }
 894
 895 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 896                         struct perf_hpp *hpp, struct hist_entry *he)
 897 {
 898         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 899 }
 900
 901 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 902                         struct perf_hpp *hpp, struct hist_entry *he)
 903 {
 904         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 905 }
 906
 907 static void
 908 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 909 {
 910         switch (idx) {
 911         case PERF_HPP_DIFF__PERIOD_BASELINE:
 912                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 913                 break;
 914
 915         default:
 916                 break;
 917         }
 918 }
 919
 920 static void
 921 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 922                 int idx, char *buf, size_t size)
 923 {
 924         double diff;
 925         double ratio;
 926         s64 wdiff;
 927
 928         switch (idx) {
 929         case PERF_HPP_DIFF__DELTA:
 930                 if (pair->diff.computed)
 931                         diff = pair->diff.period_ratio_delta;
 932                 else
 933                         diff = compute_delta(he, pair);
 934
 935                 if (fabs(diff) >= 0.01)
 936                         scnprintf(buf, size, "%+4.2F%%", diff);
 937                 break;
 938
 939         case PERF_HPP_DIFF__RATIO:
 940                 /* No point for ratio number if we are dummy.. */
 941                 if (he->dummy)
 942                         break;
 943
 944                 if (pair->diff.computed)
 945                         ratio = pair->diff.period_ratio;
 946                 else
 947                         ratio = compute_ratio(he, pair);
 948
 949                 if (ratio > 0.0)
 950                         scnprintf(buf, size, "%14.6F", ratio);
 951                 break;
 952
 953         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 954                 /* No point for wdiff number if we are dummy.. */
 955                 if (he->dummy)
 956                         break;
 957
 958                 if (pair->diff.computed)
 959                         wdiff = pair->diff.wdiff;
 960                 else
 961                         wdiff = compute_wdiff(he, pair);
 962
 963                 if (wdiff != 0)
 964                         scnprintf(buf, size, "%14ld", wdiff);
 965                 break;
 966
 967         case PERF_HPP_DIFF__FORMULA:
 968                 formula_fprintf(he, pair, buf, size);
 969                 break;
 970
 971         case PERF_HPP_DIFF__PERIOD:
 972                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
 973                 break;
 974
 975         default:
 976                 BUG_ON(1);
 977         };
 978 }
 979
 980 static void
 981 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
 982                     char *buf, size_t size)
 983 {
 984         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 985         int idx = dfmt->idx;
 986
 987         /* baseline is special */
 988         if (idx == PERF_HPP_DIFF__BASELINE)
 989                 hpp__entry_baseline(he, buf, size);
 990         else {
 991                 if (pair)
 992                         hpp__entry_pair(he, pair, idx, buf, size);
 993                 else
 994                         hpp__entry_unpair(he, idx, buf, size);
 995         }
 996 }
 997
 998 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
 999                              struct hist_entry *he)
1000 {
1001         struct diff_hpp_fmt *dfmt =
1002                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1003         char buf[MAX_COL_WIDTH] = " ";
1004
1005         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1006
1007         if (symbol_conf.field_sep)
1008                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1009         else
1010                 return scnprintf(hpp->buf, hpp->size, "%*s",
1011                                  dfmt->header_width, buf);
1012 }
1013
1014 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1015                        struct perf_evsel *evsel __maybe_unused)
1016 {
1017         struct diff_hpp_fmt *dfmt =
1018                 container_of(fmt, struct diff_hpp_fmt, fmt);
1019
1020         BUG_ON(!dfmt->header);
1021         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1022 }
1023
1024 static int hpp__width(struct perf_hpp_fmt *fmt,
1025                       struct perf_hpp *hpp __maybe_unused,
1026                       struct perf_evsel *evsel __maybe_unused)
1027 {
1028         struct diff_hpp_fmt *dfmt =
1029                 container_of(fmt, struct diff_hpp_fmt, fmt);
1030
1031         BUG_ON(dfmt->header_width <= 0);
1032         return dfmt->header_width;
1033 }
1034
1035 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1036 {
1037 #define MAX_HEADER_NAME 100
1038         char buf_indent[MAX_HEADER_NAME];
1039         char buf[MAX_HEADER_NAME];
1040         const char *header = NULL;
1041         int width = 0;
1042
1043         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1044         header = columns[dfmt->idx].name;
1045         width  = columns[dfmt->idx].width;
1046
1047         /* Only our defined HPP fmts should appear here. */
1048         BUG_ON(!header);
1049
1050         if (data__files_cnt > 2)
1051                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1052
1053 #define NAME (data__files_cnt > 2 ? buf : header)
1054         dfmt->header_width = width;
1055         width = (int) strlen(NAME);
1056         if (dfmt->header_width < width)
1057                 dfmt->header_width = width;
1058
1059         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1060                   dfmt->header_width, NAME);
1061
1062         dfmt->header = strdup(buf_indent);
1063 #undef MAX_HEADER_NAME
1064 #undef NAME
1065 }
1066
1067 static void data__hpp_register(struct data__file *d, int idx)
1068 {
1069         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1070         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1071
1072         dfmt->idx = idx;
1073
1074         fmt->header = hpp__header;
1075         fmt->width  = hpp__width;
1076         fmt->entry  = hpp__entry_global;
1077         fmt->cmp    = hist_entry__cmp_nop;
1078         fmt->collapse = hist_entry__cmp_nop;
1079
1080         /* TODO more colors */
1081         switch (idx) {
1082         case PERF_HPP_DIFF__BASELINE:
1083                 fmt->color = hpp__color_baseline;
1084                 fmt->sort  = hist_entry__cmp_baseline;
1085                 break;
1086         case PERF_HPP_DIFF__DELTA:
1087                 fmt->color = hpp__color_delta;
1088                 fmt->sort  = hist_entry__cmp_delta;
1089                 break;
1090         case PERF_HPP_DIFF__RATIO:
1091                 fmt->color = hpp__color_ratio;
1092                 fmt->sort  = hist_entry__cmp_ratio;
1093                 break;
1094         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1095                 fmt->color = hpp__color_wdiff;
1096                 fmt->sort  = hist_entry__cmp_wdiff;
1097                 break;
1098         default:
1099                 fmt->sort  = hist_entry__cmp_nop;
1100                 break;
1101         }
1102
1103         init_header(d, dfmt);
1104         perf_hpp__column_register(fmt);
1105         perf_hpp__register_sort_field(fmt);
1106 }
1107
1108 static void ui_init(void)
1109 {
1110         struct data__file *d;
1111         int i;
1112
1113         data__for_each_file(i, d) {
1114
1115                 /*
1116                  * Baseline or compute realted columns:
1117                  *
1118                  *   PERF_HPP_DIFF__BASELINE
1119                  *   PERF_HPP_DIFF__DELTA
1120                  *   PERF_HPP_DIFF__RATIO
1121                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1122                  */
1123                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1124                                           PERF_HPP_DIFF__BASELINE);
1125
1126                 /*
1127                  * And the rest:
1128                  *
1129                  * PERF_HPP_DIFF__FORMULA
1130                  * PERF_HPP_DIFF__PERIOD
1131                  * PERF_HPP_DIFF__PERIOD_BASELINE
1132                  */
1133                 if (show_formula && i)
1134                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1135
1136                 if (show_period)
1137                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1138                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1139         }
1140 }
1141
1142 static int data_init(int argc, const char **argv)
1143 {
1144         struct data__file *d;
1145         static const char *defaults[] = {
1146                 "perf.data.old",
1147                 "perf.data",
1148         };
1149         bool use_default = true;
1150         int i;
1151
1152         data__files_cnt = 2;
1153
1154         if (argc) {
1155                 if (argc == 1)
1156                         defaults[1] = argv[0];
1157                 else {
1158                         data__files_cnt = argc;
1159                         use_default = false;
1160                 }
1161         } else if (perf_guest) {
1162                 defaults[0] = "perf.data.host";
1163                 defaults[1] = "perf.data.guest";
1164         }
1165
1166         if (sort_compute >= (unsigned int) data__files_cnt) {
1167                 pr_err("Order option out of limit.\n");
1168                 return -EINVAL;
1169         }
1170
1171         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1172         if (!data__files)
1173                 return -ENOMEM;
1174
1175         data__for_each_file(i, d) {
1176                 struct perf_data_file *file = &d->file;
1177
1178                 file->path  = use_default ? defaults[i] : argv[i];
1179                 file->mode  = PERF_DATA_MODE_READ,
1180                 file->force = force,
1181
1182                 d->idx  = i;
1183         }
1184
1185         return 0;
1186 }
1187
1188 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1189 {
1190         int ret = hists__init();
1191
1192         if (ret < 0)
1193                 return ret;
1194
1195         perf_config(perf_default_config, NULL);
1196
1197         argc = parse_options(argc, argv, options, diff_usage, 0);
1198
1199         if (symbol__init(NULL) < 0)
1200                 return -1;
1201
1202         if (data_init(argc, argv) < 0)
1203                 return -1;
1204
1205         ui_init();
1206
1207         sort__mode = SORT_MODE__DIFF;
1208
1209         if (setup_sorting() < 0)
1210                 usage_with_options(diff_usage, options);
1211
1212         setup_pager();
1213
1214         sort__setup_elide(NULL);
1215
1216         return __cmd_diff();
1217 }