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