kernel/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         int ret = -1;
 332
 333         if (perf_event__preprocess_sample(event, 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->period,
 340                              sample->weight, sample->transaction)) {
 341                 pr_warning("problem incrementing symbol period, skipping event\n");
 342                 goto out_put;
 343         }
 344
 345         /*
 346          * The total_period is updated here before going to the output
 347          * tree since normally only the baseline hists will call
 348          * hists__output_resort() and precompute needs the total
 349          * period in order to sort entries by percentage delta.
 350          */
 351         hists->stats.total_period += sample->period;
 352         if (!al.filtered)
 353                 hists->stats.total_non_filtered_period += sample->period;
 354         ret = 0;
 355 out_put:
 356         addr_location__put(&al);
 357         return ret;
 358 }
 359
 360 static struct perf_tool tool = {
 361         .sample = diff__process_sample_event,
 362         .mmap   = perf_event__process_mmap,
 363         .mmap2  = perf_event__process_mmap2,
 364         .comm   = perf_event__process_comm,
 365         .exit   = perf_event__process_exit,
 366         .fork   = perf_event__process_fork,
 367         .lost   = perf_event__process_lost,
 368         .ordered_events = true,
 369         .ordering_requires_timestamps = true,
 370 };
 371
 372 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 373                                       struct perf_evlist *evlist)
 374 {
 375         struct perf_evsel *e;
 376
 377         evlist__for_each(evlist, e) {
 378                 if (perf_evsel__match2(evsel, e))
 379                         return e;
 380         }
 381
 382         return NULL;
 383 }
 384
 385 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 386 {
 387         struct perf_evsel *evsel;
 388
 389         evlist__for_each(evlist, evsel) {
 390                 struct hists *hists = evsel__hists(evsel);
 391
 392                 hists__collapse_resort(hists, NULL);
 393         }
 394 }
 395
 396 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 397 {
 398         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 399         void *ptr = dfmt - dfmt->idx;
 400         struct data__file *d = container_of(ptr, struct data__file, fmt);
 401
 402         return d;
 403 }
 404
 405 static struct hist_entry*
 406 get_pair_data(struct hist_entry *he, struct data__file *d)
 407 {
 408         if (hist_entry__has_pairs(he)) {
 409                 struct hist_entry *pair;
 410
 411                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 412                         if (pair->hists == d->hists)
 413                                 return pair;
 414         }
 415
 416         return NULL;
 417 }
 418
 419 static struct hist_entry*
 420 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 421 {
 422         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 423
 424         return get_pair_data(he, d);
 425 }
 426
 427 static void hists__baseline_only(struct hists *hists)
 428 {
 429         struct rb_root *root;
 430         struct rb_node *next;
 431
 432         if (sort__need_collapse)
 433                 root = &hists->entries_collapsed;
 434         else
 435                 root = hists->entries_in;
 436
 437         next = rb_first(root);
 438         while (next != NULL) {
 439                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 440
 441                 next = rb_next(&he->rb_node_in);
 442                 if (!hist_entry__next_pair(he)) {
 443                         rb_erase(&he->rb_node_in, root);
 444                         hist_entry__delete(he);
 445                 }
 446         }
 447 }
 448
 449 static void hists__precompute(struct hists *hists)
 450 {
 451         struct rb_root *root;
 452         struct rb_node *next;
 453
 454         if (sort__need_collapse)
 455                 root = &hists->entries_collapsed;
 456         else
 457                 root = hists->entries_in;
 458
 459         next = rb_first(root);
 460         while (next != NULL) {
 461                 struct hist_entry *he, *pair;
 462                 struct data__file *d;
 463                 int i;
 464
 465                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 466                 next = rb_next(&he->rb_node_in);
 467
 468                 data__for_each_file_new(i, d) {
 469                         pair = get_pair_data(he, d);
 470                         if (!pair)
 471                                 continue;
 472
 473                         switch (compute) {
 474                         case COMPUTE_DELTA:
 475                                 compute_delta(he, pair);
 476                                 break;
 477                         case COMPUTE_RATIO:
 478                                 compute_ratio(he, pair);
 479                                 break;
 480                         case COMPUTE_WEIGHTED_DIFF:
 481                                 compute_wdiff(he, pair);
 482                                 break;
 483                         default:
 484                                 BUG_ON(1);
 485                         }
 486                 }
 487         }
 488 }
 489
 490 static int64_t cmp_doubles(double l, double r)
 491 {
 492         if (l > r)
 493                 return -1;
 494         else if (l < r)
 495                 return 1;
 496         else
 497                 return 0;
 498 }
 499
 500 static int64_t
 501 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 502                         int c)
 503 {
 504         switch (c) {
 505         case COMPUTE_DELTA:
 506         {
 507                 double l = left->diff.period_ratio_delta;
 508                 double r = right->diff.period_ratio_delta;
 509
 510                 return cmp_doubles(l, r);
 511         }
 512         case COMPUTE_RATIO:
 513         {
 514                 double l = left->diff.period_ratio;
 515                 double r = right->diff.period_ratio;
 516
 517                 return cmp_doubles(l, r);
 518         }
 519         case COMPUTE_WEIGHTED_DIFF:
 520         {
 521                 s64 l = left->diff.wdiff;
 522                 s64 r = right->diff.wdiff;
 523
 524                 return r - l;
 525         }
 526         default:
 527                 BUG_ON(1);
 528         }
 529
 530         return 0;
 531 }
 532
 533 static int64_t
 534 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 535                         int c, int sort_idx)
 536 {
 537         bool pairs_left  = hist_entry__has_pairs(left);
 538         bool pairs_right = hist_entry__has_pairs(right);
 539         struct hist_entry *p_right, *p_left;
 540
 541         if (!pairs_left && !pairs_right)
 542                 return 0;
 543
 544         if (!pairs_left || !pairs_right)
 545                 return pairs_left ? -1 : 1;
 546
 547         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 548         p_right = get_pair_data(right, &data__files[sort_idx]);
 549
 550         if (!p_left && !p_right)
 551                 return 0;
 552
 553         if (!p_left || !p_right)
 554                 return p_left ? -1 : 1;
 555
 556         /*
 557          * We have 2 entries of same kind, let's
 558          * make the data comparison.
 559          */
 560         return __hist_entry__cmp_compute(p_left, p_right, c);
 561 }
 562
 563 static int64_t
 564 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 565                             int c, int sort_idx)
 566 {
 567         struct hist_entry *p_right, *p_left;
 568
 569         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 570         p_right = get_pair_data(right, &data__files[sort_idx]);
 571
 572         if (!p_left && !p_right)
 573                 return 0;
 574
 575         if (!p_left || !p_right)
 576                 return p_left ? -1 : 1;
 577
 578         if (c != COMPUTE_DELTA) {
 579                 /*
 580                  * The delta can be computed without the baseline, but
 581                  * others are not.  Put those entries which have no
 582                  * values below.
 583                  */
 584                 if (left->dummy && right->dummy)
 585                         return 0;
 586
 587                 if (left->dummy || right->dummy)
 588                         return left->dummy ? 1 : -1;
 589         }
 590
 591         return __hist_entry__cmp_compute(p_left, p_right, c);
 592 }
 593
 594 static int64_t
 595 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 596                     struct hist_entry *left __maybe_unused,
 597                     struct hist_entry *right __maybe_unused)
 598 {
 599         return 0;
 600 }
 601
 602 static int64_t
 603 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 604                          struct hist_entry *left, struct hist_entry *right)
 605 {
 606         if (left->stat.period == right->stat.period)
 607                 return 0;
 608         return left->stat.period > right->stat.period ? 1 : -1;
 609 }
 610
 611 static int64_t
 612 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 613                       struct hist_entry *left, struct hist_entry *right)
 614 {
 615         struct data__file *d = fmt_to_data_file(fmt);
 616
 617         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 618 }
 619
 620 static int64_t
 621 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 622                       struct hist_entry *left, struct hist_entry *right)
 623 {
 624         struct data__file *d = fmt_to_data_file(fmt);
 625
 626         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 627 }
 628
 629 static int64_t
 630 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 631                       struct hist_entry *left, struct hist_entry *right)
 632 {
 633         struct data__file *d = fmt_to_data_file(fmt);
 634
 635         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 636 }
 637
 638 static int64_t
 639 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 640                           struct hist_entry *left, struct hist_entry *right)
 641 {
 642         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 643                                            sort_compute);
 644 }
 645
 646 static int64_t
 647 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 648                           struct hist_entry *left, struct hist_entry *right)
 649 {
 650         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 651                                            sort_compute);
 652 }
 653
 654 static int64_t
 655 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 656                           struct hist_entry *left, struct hist_entry *right)
 657 {
 658         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 659                                            sort_compute);
 660 }
 661
 662 static void hists__process(struct hists *hists)
 663 {
 664         if (show_baseline_only)
 665                 hists__baseline_only(hists);
 666
 667         hists__precompute(hists);
 668         hists__output_resort(hists, NULL);
 669
 670         hists__fprintf(hists, true, 0, 0, 0, stdout);
 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_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 817                     "Look for files with symbols relative to this directory"),
 818         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 819         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 820                      "How to display percentage of filtered entries", parse_filter_percentage),
 821         OPT_END()
 822 };
 823
 824 static double baseline_percent(struct hist_entry *he)
 825 {
 826         u64 total = hists__total_period(he->hists);
 827
 828         return 100.0 * he->stat.period / total;
 829 }
 830
 831 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 832                                struct perf_hpp *hpp, struct hist_entry *he)
 833 {
 834         struct diff_hpp_fmt *dfmt =
 835                 container_of(fmt, struct diff_hpp_fmt, fmt);
 836         double percent = baseline_percent(he);
 837         char pfmt[20] = " ";
 838
 839         if (!he->dummy) {
 840                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 841                 return percent_color_snprintf(hpp->buf, hpp->size,
 842                                               pfmt, percent);
 843         } else
 844                 return scnprintf(hpp->buf, hpp->size, "%*s",
 845                                  dfmt->header_width, pfmt);
 846 }
 847
 848 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 849 {
 850         double percent = baseline_percent(he);
 851         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 852         int ret = 0;
 853
 854         if (!he->dummy)
 855                 ret = scnprintf(buf, size, fmt, percent);
 856
 857         return ret;
 858 }
 859
 860 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 861                                 struct perf_hpp *hpp, struct hist_entry *he,
 862                                 int comparison_method)
 863 {
 864         struct diff_hpp_fmt *dfmt =
 865                 container_of(fmt, struct diff_hpp_fmt, fmt);
 866         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 867         double diff;
 868         s64 wdiff;
 869         char pfmt[20] = " ";
 870
 871         if (!pair)
 872                 goto no_print;
 873
 874         switch (comparison_method) {
 875         case COMPUTE_DELTA:
 876                 if (pair->diff.computed)
 877                         diff = pair->diff.period_ratio_delta;
 878                 else
 879                         diff = compute_delta(he, pair);
 880
 881                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 882                 return percent_color_snprintf(hpp->buf, hpp->size,
 883                                         pfmt, diff);
 884         case COMPUTE_RATIO:
 885                 if (he->dummy)
 886                         goto dummy_print;
 887                 if (pair->diff.computed)
 888                         diff = pair->diff.period_ratio;
 889                 else
 890                         diff = compute_ratio(he, pair);
 891
 892                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 893                 return value_color_snprintf(hpp->buf, hpp->size,
 894                                         pfmt, diff);
 895         case COMPUTE_WEIGHTED_DIFF:
 896                 if (he->dummy)
 897                         goto dummy_print;
 898                 if (pair->diff.computed)
 899                         wdiff = pair->diff.wdiff;
 900                 else
 901                         wdiff = compute_wdiff(he, pair);
 902
 903                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 904                 return color_snprintf(hpp->buf, hpp->size,
 905                                 get_percent_color(wdiff),
 906                                 pfmt, wdiff);
 907         default:
 908                 BUG_ON(1);
 909         }
 910 dummy_print:
 911         return scnprintf(hpp->buf, hpp->size, "%*s",
 912                         dfmt->header_width, "N/A");
 913 no_print:
 914         return scnprintf(hpp->buf, hpp->size, "%*s",
 915                         dfmt->header_width, pfmt);
 916 }
 917
 918 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 919                         struct perf_hpp *hpp, struct hist_entry *he)
 920 {
 921         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 922 }
 923
 924 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 925                         struct perf_hpp *hpp, struct hist_entry *he)
 926 {
 927         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 928 }
 929
 930 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 931                         struct perf_hpp *hpp, struct hist_entry *he)
 932 {
 933         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 934 }
 935
 936 static void
 937 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 938 {
 939         switch (idx) {
 940         case PERF_HPP_DIFF__PERIOD_BASELINE:
 941                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 942                 break;
 943
 944         default:
 945                 break;
 946         }
 947 }
 948
 949 static void
 950 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 951                 int idx, char *buf, size_t size)
 952 {
 953         double diff;
 954         double ratio;
 955         s64 wdiff;
 956
 957         switch (idx) {
 958         case PERF_HPP_DIFF__DELTA:
 959                 if (pair->diff.computed)
 960                         diff = pair->diff.period_ratio_delta;
 961                 else
 962                         diff = compute_delta(he, pair);
 963
 964                 scnprintf(buf, size, "%+4.2F%%", diff);
 965                 break;
 966
 967         case PERF_HPP_DIFF__RATIO:
 968                 /* No point for ratio number if we are dummy.. */
 969                 if (he->dummy) {
 970                         scnprintf(buf, size, "N/A");
 971                         break;
 972                 }
 973
 974                 if (pair->diff.computed)
 975                         ratio = pair->diff.period_ratio;
 976                 else
 977                         ratio = compute_ratio(he, pair);
 978
 979                 if (ratio > 0.0)
 980                         scnprintf(buf, size, "%14.6F", ratio);
 981                 break;
 982
 983         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 984                 /* No point for wdiff number if we are dummy.. */
 985                 if (he->dummy) {
 986                         scnprintf(buf, size, "N/A");
 987                         break;
 988                 }
 989
 990                 if (pair->diff.computed)
 991                         wdiff = pair->diff.wdiff;
 992                 else
 993                         wdiff = compute_wdiff(he, pair);
 994
 995                 if (wdiff != 0)
 996                         scnprintf(buf, size, "%14ld", wdiff);
 997                 break;
 998
 999         case PERF_HPP_DIFF__FORMULA:
1000                 formula_fprintf(he, pair, buf, size);
1001                 break;
1002
1003         case PERF_HPP_DIFF__PERIOD:
1004                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1005                 break;
1006
1007         default:
1008                 BUG_ON(1);
1009         };
1010 }
1011
1012 static void
1013 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1014                     char *buf, size_t size)
1015 {
1016         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1017         int idx = dfmt->idx;
1018
1019         /* baseline is special */
1020         if (idx == PERF_HPP_DIFF__BASELINE)
1021                 hpp__entry_baseline(he, buf, size);
1022         else {
1023                 if (pair)
1024                         hpp__entry_pair(he, pair, idx, buf, size);
1025                 else
1026                         hpp__entry_unpair(he, idx, buf, size);
1027         }
1028 }
1029
1030 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1031                              struct hist_entry *he)
1032 {
1033         struct diff_hpp_fmt *dfmt =
1034                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1035         char buf[MAX_COL_WIDTH] = " ";
1036
1037         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1038
1039         if (symbol_conf.field_sep)
1040                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1041         else
1042                 return scnprintf(hpp->buf, hpp->size, "%*s",
1043                                  dfmt->header_width, buf);
1044 }
1045
1046 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1047                        struct perf_evsel *evsel __maybe_unused)
1048 {
1049         struct diff_hpp_fmt *dfmt =
1050                 container_of(fmt, struct diff_hpp_fmt, fmt);
1051
1052         BUG_ON(!dfmt->header);
1053         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1054 }
1055
1056 static int hpp__width(struct perf_hpp_fmt *fmt,
1057                       struct perf_hpp *hpp __maybe_unused,
1058                       struct perf_evsel *evsel __maybe_unused)
1059 {
1060         struct diff_hpp_fmt *dfmt =
1061                 container_of(fmt, struct diff_hpp_fmt, fmt);
1062
1063         BUG_ON(dfmt->header_width <= 0);
1064         return dfmt->header_width;
1065 }
1066
1067 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1068 {
1069 #define MAX_HEADER_NAME 100
1070         char buf_indent[MAX_HEADER_NAME];
1071         char buf[MAX_HEADER_NAME];
1072         const char *header = NULL;
1073         int width = 0;
1074
1075         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1076         header = columns[dfmt->idx].name;
1077         width  = columns[dfmt->idx].width;
1078
1079         /* Only our defined HPP fmts should appear here. */
1080         BUG_ON(!header);
1081
1082         if (data__files_cnt > 2)
1083                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1084
1085 #define NAME (data__files_cnt > 2 ? buf : header)
1086         dfmt->header_width = width;
1087         width = (int) strlen(NAME);
1088         if (dfmt->header_width < width)
1089                 dfmt->header_width = width;
1090
1091         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1092                   dfmt->header_width, NAME);
1093
1094         dfmt->header = strdup(buf_indent);
1095 #undef MAX_HEADER_NAME
1096 #undef NAME
1097 }
1098
1099 static void data__hpp_register(struct data__file *d, int idx)
1100 {
1101         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1102         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1103
1104         dfmt->idx = idx;
1105
1106         fmt->header = hpp__header;
1107         fmt->width  = hpp__width;
1108         fmt->entry  = hpp__entry_global;
1109         fmt->cmp    = hist_entry__cmp_nop;
1110         fmt->collapse = hist_entry__cmp_nop;
1111
1112         /* TODO more colors */
1113         switch (idx) {
1114         case PERF_HPP_DIFF__BASELINE:
1115                 fmt->color = hpp__color_baseline;
1116                 fmt->sort  = hist_entry__cmp_baseline;
1117                 break;
1118         case PERF_HPP_DIFF__DELTA:
1119                 fmt->color = hpp__color_delta;
1120                 fmt->sort  = hist_entry__cmp_delta;
1121                 break;
1122         case PERF_HPP_DIFF__RATIO:
1123                 fmt->color = hpp__color_ratio;
1124                 fmt->sort  = hist_entry__cmp_ratio;
1125                 break;
1126         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1127                 fmt->color = hpp__color_wdiff;
1128                 fmt->sort  = hist_entry__cmp_wdiff;
1129                 break;
1130         default:
1131                 fmt->sort  = hist_entry__cmp_nop;
1132                 break;
1133         }
1134
1135         init_header(d, dfmt);
1136         perf_hpp__column_register(fmt);
1137         perf_hpp__register_sort_field(fmt);
1138 }
1139
1140 static int ui_init(void)
1141 {
1142         struct data__file *d;
1143         struct perf_hpp_fmt *fmt;
1144         int i;
1145
1146         data__for_each_file(i, d) {
1147
1148                 /*
1149                  * Baseline or compute realted columns:
1150                  *
1151                  *   PERF_HPP_DIFF__BASELINE
1152                  *   PERF_HPP_DIFF__DELTA
1153                  *   PERF_HPP_DIFF__RATIO
1154                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1155                  */
1156                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1157                                           PERF_HPP_DIFF__BASELINE);
1158
1159                 /*
1160                  * And the rest:
1161                  *
1162                  * PERF_HPP_DIFF__FORMULA
1163                  * PERF_HPP_DIFF__PERIOD
1164                  * PERF_HPP_DIFF__PERIOD_BASELINE
1165                  */
1166                 if (show_formula && i)
1167                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1168
1169                 if (show_period)
1170                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1171                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1172         }
1173
1174         if (!sort_compute)
1175                 return 0;
1176
1177         /*
1178          * Prepend an fmt to sort on columns at 'sort_compute' first.
1179          * This fmt is added only to the sort list but not to the
1180          * output fields list.
1181          *
1182          * Note that this column (data) can be compared twice - one
1183          * for this 'sort_compute' fmt and another for the normal
1184          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1185          * will be sorted out by first try or baseline and comparing
1186          * is not a costly operation.
1187          */
1188         fmt = zalloc(sizeof(*fmt));
1189         if (fmt == NULL) {
1190                 pr_err("Memory allocation failed\n");
1191                 return -1;
1192         }
1193
1194         fmt->cmp      = hist_entry__cmp_nop;
1195         fmt->collapse = hist_entry__cmp_nop;
1196
1197         switch (compute) {
1198         case COMPUTE_DELTA:
1199                 fmt->sort = hist_entry__cmp_delta_idx;
1200                 break;
1201         case COMPUTE_RATIO:
1202                 fmt->sort = hist_entry__cmp_ratio_idx;
1203                 break;
1204         case COMPUTE_WEIGHTED_DIFF:
1205                 fmt->sort = hist_entry__cmp_wdiff_idx;
1206                 break;
1207         default:
1208                 BUG_ON(1);
1209         }
1210
1211         list_add(&fmt->sort_list, &perf_hpp__sort_list);
1212         return 0;
1213 }
1214
1215 static int data_init(int argc, const char **argv)
1216 {
1217         struct data__file *d;
1218         static const char *defaults[] = {
1219                 "perf.data.old",
1220                 "perf.data",
1221         };
1222         bool use_default = true;
1223         int i;
1224
1225         data__files_cnt = 2;
1226
1227         if (argc) {
1228                 if (argc == 1)
1229                         defaults[1] = argv[0];
1230                 else {
1231                         data__files_cnt = argc;
1232                         use_default = false;
1233                 }
1234         } else if (perf_guest) {
1235                 defaults[0] = "perf.data.host";
1236                 defaults[1] = "perf.data.guest";
1237         }
1238
1239         if (sort_compute >= (unsigned int) data__files_cnt) {
1240                 pr_err("Order option out of limit.\n");
1241                 return -EINVAL;
1242         }
1243
1244         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1245         if (!data__files)
1246                 return -ENOMEM;
1247
1248         data__for_each_file(i, d) {
1249                 struct perf_data_file *file = &d->file;
1250
1251                 file->path  = use_default ? defaults[i] : argv[i];
1252                 file->mode  = PERF_DATA_MODE_READ,
1253                 file->force = force,
1254
1255                 d->idx  = i;
1256         }
1257
1258         return 0;
1259 }
1260
1261 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1262 {
1263         int ret = hists__init();
1264
1265         if (ret < 0)
1266                 return ret;
1267
1268         perf_config(perf_default_config, NULL);
1269
1270         argc = parse_options(argc, argv, options, diff_usage, 0);
1271
1272         if (symbol__init(NULL) < 0)
1273                 return -1;
1274
1275         if (data_init(argc, argv) < 0)
1276                 return -1;
1277
1278         if (ui_init() < 0)
1279                 return -1;
1280
1281         sort__mode = SORT_MODE__DIFF;
1282
1283         if (setup_sorting() < 0)
1284                 usage_with_options(diff_usage, options);
1285
1286         setup_pager();
1287
1288         sort__setup_elide(NULL);
1289
1290         return __cmd_diff();
1291 }