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,
 315                             struct perf_sample *sample)
 316 {
 317         if (__hists__add_entry(hists, al, NULL, NULL, NULL,
 318                                sample, 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         int ret = -1;
 332
 333         if (machine__resolve(machine, &al, sample) < 0) {
 334                 pr_warning("problem processing %d event, skipping it.\n",
 335                            event->header.type);
 336                 return -1;
 337         }
 338
 339         if (hists__add_entry(hists, &al, sample)) {
 340                 pr_warning("problem incrementing symbol period, skipping event\n");
 341                 goto out_put;
 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         ret = 0;
 354 out_put:
 355         addr_location__put(&al);
 356         return ret;
 357 }
 358
 359 static struct perf_tool tool = {
 360         .sample = diff__process_sample_event,
 361         .mmap   = perf_event__process_mmap,
 362         .mmap2  = perf_event__process_mmap2,
 363         .comm   = perf_event__process_comm,
 364         .exit   = perf_event__process_exit,
 365         .fork   = perf_event__process_fork,
 366         .lost   = perf_event__process_lost,
 367         .ordered_events = true,
 368         .ordering_requires_timestamps = true,
 369 };
 370
 371 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 372                                       struct perf_evlist *evlist)
 373 {
 374         struct perf_evsel *e;
 375
 376         evlist__for_each(evlist, e) {
 377                 if (perf_evsel__match2(evsel, e))
 378                         return e;
 379         }
 380
 381         return NULL;
 382 }
 383
 384 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 385 {
 386         struct perf_evsel *evsel;
 387
 388         evlist__for_each(evlist, evsel) {
 389                 struct hists *hists = evsel__hists(evsel);
 390
 391                 hists__collapse_resort(hists, NULL);
 392         }
 393 }
 394
 395 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 396 {
 397         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 398         void *ptr = dfmt - dfmt->idx;
 399         struct data__file *d = container_of(ptr, struct data__file, fmt);
 400
 401         return d;
 402 }
 403
 404 static struct hist_entry*
 405 get_pair_data(struct hist_entry *he, struct data__file *d)
 406 {
 407         if (hist_entry__has_pairs(he)) {
 408                 struct hist_entry *pair;
 409
 410                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 411                         if (pair->hists == d->hists)
 412                                 return pair;
 413         }
 414
 415         return NULL;
 416 }
 417
 418 static struct hist_entry*
 419 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 420 {
 421         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 422
 423         return get_pair_data(he, d);
 424 }
 425
 426 static void hists__baseline_only(struct hists *hists)
 427 {
 428         struct rb_root *root;
 429         struct rb_node *next;
 430
 431         if (hists__has(hists, need_collapse))
 432                 root = &hists->entries_collapsed;
 433         else
 434                 root = hists->entries_in;
 435
 436         next = rb_first(root);
 437         while (next != NULL) {
 438                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 439
 440                 next = rb_next(&he->rb_node_in);
 441                 if (!hist_entry__next_pair(he)) {
 442                         rb_erase(&he->rb_node_in, root);
 443                         hist_entry__delete(he);
 444                 }
 445         }
 446 }
 447
 448 static void hists__precompute(struct hists *hists)
 449 {
 450         struct rb_root *root;
 451         struct rb_node *next;
 452
 453         if (hists__has(hists, need_collapse))
 454                 root = &hists->entries_collapsed;
 455         else
 456                 root = hists->entries_in;
 457
 458         next = rb_first(root);
 459         while (next != NULL) {
 460                 struct hist_entry *he, *pair;
 461                 struct data__file *d;
 462                 int i;
 463
 464                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 465                 next = rb_next(&he->rb_node_in);
 466
 467                 data__for_each_file_new(i, d) {
 468                         pair = get_pair_data(he, d);
 469                         if (!pair)
 470                                 continue;
 471
 472                         switch (compute) {
 473                         case COMPUTE_DELTA:
 474                                 compute_delta(he, pair);
 475                                 break;
 476                         case COMPUTE_RATIO:
 477                                 compute_ratio(he, pair);
 478                                 break;
 479                         case COMPUTE_WEIGHTED_DIFF:
 480                                 compute_wdiff(he, pair);
 481                                 break;
 482                         default:
 483                                 BUG_ON(1);
 484                         }
 485                 }
 486         }
 487 }
 488
 489 static int64_t cmp_doubles(double l, double r)
 490 {
 491         if (l > r)
 492                 return -1;
 493         else if (l < r)
 494                 return 1;
 495         else
 496                 return 0;
 497 }
 498
 499 static int64_t
 500 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 501                         int c)
 502 {
 503         switch (c) {
 504         case COMPUTE_DELTA:
 505         {
 506                 double l = left->diff.period_ratio_delta;
 507                 double r = right->diff.period_ratio_delta;
 508
 509                 return cmp_doubles(l, r);
 510         }
 511         case COMPUTE_RATIO:
 512         {
 513                 double l = left->diff.period_ratio;
 514                 double r = right->diff.period_ratio;
 515
 516                 return cmp_doubles(l, r);
 517         }
 518         case COMPUTE_WEIGHTED_DIFF:
 519         {
 520                 s64 l = left->diff.wdiff;
 521                 s64 r = right->diff.wdiff;
 522
 523                 return r - l;
 524         }
 525         default:
 526                 BUG_ON(1);
 527         }
 528
 529         return 0;
 530 }
 531
 532 static int64_t
 533 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 534                         int c, int sort_idx)
 535 {
 536         bool pairs_left  = hist_entry__has_pairs(left);
 537         bool pairs_right = hist_entry__has_pairs(right);
 538         struct hist_entry *p_right, *p_left;
 539
 540         if (!pairs_left && !pairs_right)
 541                 return 0;
 542
 543         if (!pairs_left || !pairs_right)
 544                 return pairs_left ? -1 : 1;
 545
 546         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 547         p_right = get_pair_data(right, &data__files[sort_idx]);
 548
 549         if (!p_left && !p_right)
 550                 return 0;
 551
 552         if (!p_left || !p_right)
 553                 return p_left ? -1 : 1;
 554
 555         /*
 556          * We have 2 entries of same kind, let's
 557          * make the data comparison.
 558          */
 559         return __hist_entry__cmp_compute(p_left, p_right, c);
 560 }
 561
 562 static int64_t
 563 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 564                             int c, int sort_idx)
 565 {
 566         struct hist_entry *p_right, *p_left;
 567
 568         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 569         p_right = get_pair_data(right, &data__files[sort_idx]);
 570
 571         if (!p_left && !p_right)
 572                 return 0;
 573
 574         if (!p_left || !p_right)
 575                 return p_left ? -1 : 1;
 576
 577         if (c != COMPUTE_DELTA) {
 578                 /*
 579                  * The delta can be computed without the baseline, but
 580                  * others are not.  Put those entries which have no
 581                  * values below.
 582                  */
 583                 if (left->dummy && right->dummy)
 584                         return 0;
 585
 586                 if (left->dummy || right->dummy)
 587                         return left->dummy ? 1 : -1;
 588         }
 589
 590         return __hist_entry__cmp_compute(p_left, p_right, c);
 591 }
 592
 593 static int64_t
 594 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 595                     struct hist_entry *left __maybe_unused,
 596                     struct hist_entry *right __maybe_unused)
 597 {
 598         return 0;
 599 }
 600
 601 static int64_t
 602 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 603                          struct hist_entry *left, struct hist_entry *right)
 604 {
 605         if (left->stat.period == right->stat.period)
 606                 return 0;
 607         return left->stat.period > right->stat.period ? 1 : -1;
 608 }
 609
 610 static int64_t
 611 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 612                       struct hist_entry *left, struct hist_entry *right)
 613 {
 614         struct data__file *d = fmt_to_data_file(fmt);
 615
 616         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 617 }
 618
 619 static int64_t
 620 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 621                       struct hist_entry *left, struct hist_entry *right)
 622 {
 623         struct data__file *d = fmt_to_data_file(fmt);
 624
 625         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 626 }
 627
 628 static int64_t
 629 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 630                       struct hist_entry *left, struct hist_entry *right)
 631 {
 632         struct data__file *d = fmt_to_data_file(fmt);
 633
 634         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 635 }
 636
 637 static int64_t
 638 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 639                           struct hist_entry *left, struct hist_entry *right)
 640 {
 641         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 642                                            sort_compute);
 643 }
 644
 645 static int64_t
 646 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 647                           struct hist_entry *left, struct hist_entry *right)
 648 {
 649         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 650                                            sort_compute);
 651 }
 652
 653 static int64_t
 654 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 655                           struct hist_entry *left, struct hist_entry *right)
 656 {
 657         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 658                                            sort_compute);
 659 }
 660
 661 static void hists__process(struct hists *hists)
 662 {
 663         if (show_baseline_only)
 664                 hists__baseline_only(hists);
 665
 666         hists__precompute(hists);
 667         hists__output_resort(hists, NULL);
 668
 669         hists__fprintf(hists, true, 0, 0, 0, stdout,
 670                        symbol_conf.use_callchain);
 671 }
 672
 673 static void data__fprintf(void)
 674 {
 675         struct data__file *d;
 676         int i;
 677
 678         fprintf(stdout, "# Data files:\n");
 679
 680         data__for_each_file(i, d)
 681                 fprintf(stdout, "#  [%d] %s %s\n",
 682                         d->idx, d->file.path,
 683                         !d->idx ? "(Baseline)" : "");
 684
 685         fprintf(stdout, "#\n");
 686 }
 687
 688 static void data_process(void)
 689 {
 690         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 691         struct perf_evsel *evsel_base;
 692         bool first = true;
 693
 694         evlist__for_each(evlist_base, evsel_base) {
 695                 struct hists *hists_base = evsel__hists(evsel_base);
 696                 struct data__file *d;
 697                 int i;
 698
 699                 data__for_each_file_new(i, d) {
 700                         struct perf_evlist *evlist = d->session->evlist;
 701                         struct perf_evsel *evsel;
 702                         struct hists *hists;
 703
 704                         evsel = evsel_match(evsel_base, evlist);
 705                         if (!evsel)
 706                                 continue;
 707
 708                         hists = evsel__hists(evsel);
 709                         d->hists = hists;
 710
 711                         hists__match(hists_base, hists);
 712
 713                         if (!show_baseline_only)
 714                                 hists__link(hists_base, hists);
 715                 }
 716
 717                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 718                         perf_evsel__name(evsel_base));
 719
 720                 first = false;
 721
 722                 if (verbose || data__files_cnt > 2)
 723                         data__fprintf();
 724
 725                 /* Don't sort callchain for perf diff */
 726                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 727
 728                 hists__process(hists_base);
 729         }
 730 }
 731
 732 static void data__free(struct data__file *d)
 733 {
 734         int col;
 735
 736         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 737                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 738
 739                 zfree(&fmt->header);
 740         }
 741 }
 742
 743 static int __cmd_diff(void)
 744 {
 745         struct data__file *d;
 746         int ret = -EINVAL, i;
 747
 748         data__for_each_file(i, d) {
 749                 d->session = perf_session__new(&d->file, false, &tool);
 750                 if (!d->session) {
 751                         pr_err("Failed to open %s\n", d->file.path);
 752                         ret = -1;
 753                         goto out_delete;
 754                 }
 755
 756                 ret = perf_session__process_events(d->session);
 757                 if (ret) {
 758                         pr_err("Failed to process %s\n", d->file.path);
 759                         goto out_delete;
 760                 }
 761
 762                 perf_evlist__collapse_resort(d->session->evlist);
 763         }
 764
 765         data_process();
 766
 767  out_delete:
 768         data__for_each_file(i, d) {
 769                 if (d->session)
 770                         perf_session__delete(d->session);
 771
 772                 data__free(d);
 773         }
 774
 775         free(data__files);
 776         return ret;
 777 }
 778
 779 static const char * const diff_usage[] = {
 780         "perf diff [<options>] [old_file] [new_file]",
 781         NULL,
 782 };
 783
 784 static const struct option options[] = {
 785         OPT_INCR('v', "verbose", &verbose,
 786                     "be more verbose (show symbol address, etc)"),
 787         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 788                     "Show only items with match in baseline"),
 789         OPT_CALLBACK('c', "compute", &compute,
 790                      "delta,ratio,wdiff:w1,w2 (default delta)",
 791                      "Entries differential computation selection",
 792                      setup_compute),
 793         OPT_BOOLEAN('p', "period", &show_period,
 794                     "Show period values."),
 795         OPT_BOOLEAN('F', "formula", &show_formula,
 796                     "Show formula."),
 797         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 798                     "dump raw trace in ASCII"),
 799         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 800         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
 801                    "file", "kallsyms pathname"),
 802         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 803                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 804         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 805                    "only consider symbols in these dsos"),
 806         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 807                    "only consider symbols in these comms"),
 808         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 809                    "only consider these symbols"),
 810         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 811                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 812                    " Please refer the man page for the complete list."),
 813         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
 814                    "separator for columns, no spaces will be added between "
 815                    "columns '.' is reserved."),
 816         OPT_CALLBACK(0, "symfs", NULL, "directory",
 817                      "Look for files with symbols relative to this directory",
 818                      symbol__config_symfs),
 819         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 820         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 821                      "How to display percentage of filtered entries", parse_filter_percentage),
 822         OPT_END()
 823 };
 824
 825 static double baseline_percent(struct hist_entry *he)
 826 {
 827         u64 total = hists__total_period(he->hists);
 828
 829         return 100.0 * he->stat.period / total;
 830 }
 831
 832 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 833                                struct perf_hpp *hpp, struct hist_entry *he)
 834 {
 835         struct diff_hpp_fmt *dfmt =
 836                 container_of(fmt, struct diff_hpp_fmt, fmt);
 837         double percent = baseline_percent(he);
 838         char pfmt[20] = " ";
 839
 840         if (!he->dummy) {
 841                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 842                 return percent_color_snprintf(hpp->buf, hpp->size,
 843                                               pfmt, percent);
 844         } else
 845                 return scnprintf(hpp->buf, hpp->size, "%*s",
 846                                  dfmt->header_width, pfmt);
 847 }
 848
 849 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 850 {
 851         double percent = baseline_percent(he);
 852         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 853         int ret = 0;
 854
 855         if (!he->dummy)
 856                 ret = scnprintf(buf, size, fmt, percent);
 857
 858         return ret;
 859 }
 860
 861 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 862                                 struct perf_hpp *hpp, struct hist_entry *he,
 863                                 int comparison_method)
 864 {
 865         struct diff_hpp_fmt *dfmt =
 866                 container_of(fmt, struct diff_hpp_fmt, fmt);
 867         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 868         double diff;
 869         s64 wdiff;
 870         char pfmt[20] = " ";
 871
 872         if (!pair)
 873                 goto no_print;
 874
 875         switch (comparison_method) {
 876         case COMPUTE_DELTA:
 877                 if (pair->diff.computed)
 878                         diff = pair->diff.period_ratio_delta;
 879                 else
 880                         diff = compute_delta(he, pair);
 881
 882                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 883                 return percent_color_snprintf(hpp->buf, hpp->size,
 884                                         pfmt, diff);
 885         case COMPUTE_RATIO:
 886                 if (he->dummy)
 887                         goto dummy_print;
 888                 if (pair->diff.computed)
 889                         diff = pair->diff.period_ratio;
 890                 else
 891                         diff = compute_ratio(he, pair);
 892
 893                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 894                 return value_color_snprintf(hpp->buf, hpp->size,
 895                                         pfmt, diff);
 896         case COMPUTE_WEIGHTED_DIFF:
 897                 if (he->dummy)
 898                         goto dummy_print;
 899                 if (pair->diff.computed)
 900                         wdiff = pair->diff.wdiff;
 901                 else
 902                         wdiff = compute_wdiff(he, pair);
 903
 904                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 905                 return color_snprintf(hpp->buf, hpp->size,
 906                                 get_percent_color(wdiff),
 907                                 pfmt, wdiff);
 908         default:
 909                 BUG_ON(1);
 910         }
 911 dummy_print:
 912         return scnprintf(hpp->buf, hpp->size, "%*s",
 913                         dfmt->header_width, "N/A");
 914 no_print:
 915         return scnprintf(hpp->buf, hpp->size, "%*s",
 916                         dfmt->header_width, pfmt);
 917 }
 918
 919 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 920                         struct perf_hpp *hpp, struct hist_entry *he)
 921 {
 922         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 923 }
 924
 925 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 926                         struct perf_hpp *hpp, struct hist_entry *he)
 927 {
 928         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 929 }
 930
 931 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 932                         struct perf_hpp *hpp, struct hist_entry *he)
 933 {
 934         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 935 }
 936
 937 static void
 938 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 939 {
 940         switch (idx) {
 941         case PERF_HPP_DIFF__PERIOD_BASELINE:
 942                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 943                 break;
 944
 945         default:
 946                 break;
 947         }
 948 }
 949
 950 static void
 951 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 952                 int idx, char *buf, size_t size)
 953 {
 954         double diff;
 955         double ratio;
 956         s64 wdiff;
 957
 958         switch (idx) {
 959         case PERF_HPP_DIFF__DELTA:
 960                 if (pair->diff.computed)
 961                         diff = pair->diff.period_ratio_delta;
 962                 else
 963                         diff = compute_delta(he, pair);
 964
 965                 scnprintf(buf, size, "%+4.2F%%", diff);
 966                 break;
 967
 968         case PERF_HPP_DIFF__RATIO:
 969                 /* No point for ratio number if we are dummy.. */
 970                 if (he->dummy) {
 971                         scnprintf(buf, size, "N/A");
 972                         break;
 973                 }
 974
 975                 if (pair->diff.computed)
 976                         ratio = pair->diff.period_ratio;
 977                 else
 978                         ratio = compute_ratio(he, pair);
 979
 980                 if (ratio > 0.0)
 981                         scnprintf(buf, size, "%14.6F", ratio);
 982                 break;
 983
 984         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 985                 /* No point for wdiff number if we are dummy.. */
 986                 if (he->dummy) {
 987                         scnprintf(buf, size, "N/A");
 988                         break;
 989                 }
 990
 991                 if (pair->diff.computed)
 992                         wdiff = pair->diff.wdiff;
 993                 else
 994                         wdiff = compute_wdiff(he, pair);
 995
 996                 if (wdiff != 0)
 997                         scnprintf(buf, size, "%14ld", wdiff);
 998                 break;
 999
1000         case PERF_HPP_DIFF__FORMULA:
1001                 formula_fprintf(he, pair, buf, size);
1002                 break;
1003
1004         case PERF_HPP_DIFF__PERIOD:
1005                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1006                 break;
1007
1008         default:
1009                 BUG_ON(1);
1010         };
1011 }
1012
1013 static void
1014 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1015                     char *buf, size_t size)
1016 {
1017         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1018         int idx = dfmt->idx;
1019
1020         /* baseline is special */
1021         if (idx == PERF_HPP_DIFF__BASELINE)
1022                 hpp__entry_baseline(he, buf, size);
1023         else {
1024                 if (pair)
1025                         hpp__entry_pair(he, pair, idx, buf, size);
1026                 else
1027                         hpp__entry_unpair(he, idx, buf, size);
1028         }
1029 }
1030
1031 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1032                              struct hist_entry *he)
1033 {
1034         struct diff_hpp_fmt *dfmt =
1035                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1036         char buf[MAX_COL_WIDTH] = " ";
1037
1038         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1039
1040         if (symbol_conf.field_sep)
1041                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1042         else
1043                 return scnprintf(hpp->buf, hpp->size, "%*s",
1044                                  dfmt->header_width, buf);
1045 }
1046
1047 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1048                        struct hists *hists __maybe_unused)
1049 {
1050         struct diff_hpp_fmt *dfmt =
1051                 container_of(fmt, struct diff_hpp_fmt, fmt);
1052
1053         BUG_ON(!dfmt->header);
1054         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1055 }
1056
1057 static int hpp__width(struct perf_hpp_fmt *fmt,
1058                       struct perf_hpp *hpp __maybe_unused,
1059                       struct perf_evsel *evsel __maybe_unused)
1060 {
1061         struct diff_hpp_fmt *dfmt =
1062                 container_of(fmt, struct diff_hpp_fmt, fmt);
1063
1064         BUG_ON(dfmt->header_width <= 0);
1065         return dfmt->header_width;
1066 }
1067
1068 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1069 {
1070 #define MAX_HEADER_NAME 100
1071         char buf_indent[MAX_HEADER_NAME];
1072         char buf[MAX_HEADER_NAME];
1073         const char *header = NULL;
1074         int width = 0;
1075
1076         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1077         header = columns[dfmt->idx].name;
1078         width  = columns[dfmt->idx].width;
1079
1080         /* Only our defined HPP fmts should appear here. */
1081         BUG_ON(!header);
1082
1083         if (data__files_cnt > 2)
1084                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1085
1086 #define NAME (data__files_cnt > 2 ? buf : header)
1087         dfmt->header_width = width;
1088         width = (int) strlen(NAME);
1089         if (dfmt->header_width < width)
1090                 dfmt->header_width = width;
1091
1092         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1093                   dfmt->header_width, NAME);
1094
1095         dfmt->header = strdup(buf_indent);
1096 #undef MAX_HEADER_NAME
1097 #undef NAME
1098 }
1099
1100 static void data__hpp_register(struct data__file *d, int idx)
1101 {
1102         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1103         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1104
1105         dfmt->idx = idx;
1106
1107         fmt->header = hpp__header;
1108         fmt->width  = hpp__width;
1109         fmt->entry  = hpp__entry_global;
1110         fmt->cmp    = hist_entry__cmp_nop;
1111         fmt->collapse = hist_entry__cmp_nop;
1112
1113         /* TODO more colors */
1114         switch (idx) {
1115         case PERF_HPP_DIFF__BASELINE:
1116                 fmt->color = hpp__color_baseline;
1117                 fmt->sort  = hist_entry__cmp_baseline;
1118                 break;
1119         case PERF_HPP_DIFF__DELTA:
1120                 fmt->color = hpp__color_delta;
1121                 fmt->sort  = hist_entry__cmp_delta;
1122                 break;
1123         case PERF_HPP_DIFF__RATIO:
1124                 fmt->color = hpp__color_ratio;
1125                 fmt->sort  = hist_entry__cmp_ratio;
1126                 break;
1127         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1128                 fmt->color = hpp__color_wdiff;
1129                 fmt->sort  = hist_entry__cmp_wdiff;
1130                 break;
1131         default:
1132                 fmt->sort  = hist_entry__cmp_nop;
1133                 break;
1134         }
1135
1136         init_header(d, dfmt);
1137         perf_hpp__column_register(fmt);
1138         perf_hpp__register_sort_field(fmt);
1139 }
1140
1141 static int ui_init(void)
1142 {
1143         struct data__file *d;
1144         struct perf_hpp_fmt *fmt;
1145         int i;
1146
1147         data__for_each_file(i, d) {
1148
1149                 /*
1150                  * Baseline or compute realted columns:
1151                  *
1152                  *   PERF_HPP_DIFF__BASELINE
1153                  *   PERF_HPP_DIFF__DELTA
1154                  *   PERF_HPP_DIFF__RATIO
1155                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1156                  */
1157                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1158                                           PERF_HPP_DIFF__BASELINE);
1159
1160                 /*
1161                  * And the rest:
1162                  *
1163                  * PERF_HPP_DIFF__FORMULA
1164                  * PERF_HPP_DIFF__PERIOD
1165                  * PERF_HPP_DIFF__PERIOD_BASELINE
1166                  */
1167                 if (show_formula && i)
1168                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1169
1170                 if (show_period)
1171                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1172                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1173         }
1174
1175         if (!sort_compute)
1176                 return 0;
1177
1178         /*
1179          * Prepend an fmt to sort on columns at 'sort_compute' first.
1180          * This fmt is added only to the sort list but not to the
1181          * output fields list.
1182          *
1183          * Note that this column (data) can be compared twice - one
1184          * for this 'sort_compute' fmt and another for the normal
1185          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1186          * will be sorted out by first try or baseline and comparing
1187          * is not a costly operation.
1188          */
1189         fmt = zalloc(sizeof(*fmt));
1190         if (fmt == NULL) {
1191                 pr_err("Memory allocation failed\n");
1192                 return -1;
1193         }
1194
1195         fmt->cmp      = hist_entry__cmp_nop;
1196         fmt->collapse = hist_entry__cmp_nop;
1197
1198         switch (compute) {
1199         case COMPUTE_DELTA:
1200                 fmt->sort = hist_entry__cmp_delta_idx;
1201                 break;
1202         case COMPUTE_RATIO:
1203                 fmt->sort = hist_entry__cmp_ratio_idx;
1204                 break;
1205         case COMPUTE_WEIGHTED_DIFF:
1206                 fmt->sort = hist_entry__cmp_wdiff_idx;
1207                 break;
1208         default:
1209                 BUG_ON(1);
1210         }
1211
1212         perf_hpp__register_sort_field(fmt);
1213         return 0;
1214 }
1215
1216 static int data_init(int argc, const char **argv)
1217 {
1218         struct data__file *d;
1219         static const char *defaults[] = {
1220                 "perf.data.old",
1221                 "perf.data",
1222         };
1223         bool use_default = true;
1224         int i;
1225
1226         data__files_cnt = 2;
1227
1228         if (argc) {
1229                 if (argc == 1)
1230                         defaults[1] = argv[0];
1231                 else {
1232                         data__files_cnt = argc;
1233                         use_default = false;
1234                 }
1235         } else if (perf_guest) {
1236                 defaults[0] = "perf.data.host";
1237                 defaults[1] = "perf.data.guest";
1238         }
1239
1240         if (sort_compute >= (unsigned int) data__files_cnt) {
1241                 pr_err("Order option out of limit.\n");
1242                 return -EINVAL;
1243         }
1244
1245         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1246         if (!data__files)
1247                 return -ENOMEM;
1248
1249         data__for_each_file(i, d) {
1250                 struct perf_data_file *file = &d->file;
1251
1252                 file->path  = use_default ? defaults[i] : argv[i];
1253                 file->mode  = PERF_DATA_MODE_READ,
1254                 file->force = force,
1255
1256                 d->idx  = i;
1257         }
1258
1259         return 0;
1260 }
1261
1262 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1263 {
1264         int ret = hists__init();
1265
1266         if (ret < 0)
1267                 return ret;
1268
1269         argc = parse_options(argc, argv, options, diff_usage, 0);
1270
1271         if (symbol__init(NULL) < 0)
1272                 return -1;
1273
1274         if (data_init(argc, argv) < 0)
1275                 return -1;
1276
1277         if (ui_init() < 0)
1278                 return -1;
1279
1280         sort__mode = SORT_MODE__DIFF;
1281
1282         if (setup_sorting(NULL) < 0)
1283                 usage_with_options(diff_usage, options);
1284
1285         setup_pager();
1286
1287         sort__setup_elide(NULL);
1288
1289         return __cmd_diff();
1290 }