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 diff__process_sample_event(struct perf_tool *tool __maybe_unused,
 314                                       union perf_event *event,
 315                                       struct perf_sample *sample,
 316                                       struct perf_evsel *evsel,
 317                                       struct machine *machine)
 318 {
 319         struct addr_location al;
 320         struct hists *hists = evsel__hists(evsel);
 321         int ret = -1;
 322
 323         if (machine__resolve(machine, &al, sample) < 0) {
 324                 pr_warning("problem processing %d event, skipping it.\n",
 325                            event->header.type);
 326                 return -1;
 327         }
 328
 329         if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample, true)) {
 330                 pr_warning("problem incrementing symbol period, skipping event\n");
 331                 goto out_put;
 332         }
 333
 334         /*
 335          * The total_period is updated here before going to the output
 336          * tree since normally only the baseline hists will call
 337          * hists__output_resort() and precompute needs the total
 338          * period in order to sort entries by percentage delta.
 339          */
 340         hists->stats.total_period += sample->period;
 341         if (!al.filtered)
 342                 hists->stats.total_non_filtered_period += sample->period;
 343         ret = 0;
 344 out_put:
 345         addr_location__put(&al);
 346         return ret;
 347 }
 348
 349 static struct perf_tool tool = {
 350         .sample = diff__process_sample_event,
 351         .mmap   = perf_event__process_mmap,
 352         .mmap2  = perf_event__process_mmap2,
 353         .comm   = perf_event__process_comm,
 354         .exit   = perf_event__process_exit,
 355         .fork   = perf_event__process_fork,
 356         .lost   = perf_event__process_lost,
 357         .ordered_events = true,
 358         .ordering_requires_timestamps = true,
 359 };
 360
 361 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 362                                       struct perf_evlist *evlist)
 363 {
 364         struct perf_evsel *e;
 365
 366         evlist__for_each_entry(evlist, e) {
 367                 if (perf_evsel__match2(evsel, e))
 368                         return e;
 369         }
 370
 371         return NULL;
 372 }
 373
 374 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 375 {
 376         struct perf_evsel *evsel;
 377
 378         evlist__for_each_entry(evlist, evsel) {
 379                 struct hists *hists = evsel__hists(evsel);
 380
 381                 hists__collapse_resort(hists, NULL);
 382         }
 383 }
 384
 385 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 386 {
 387         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 388         void *ptr = dfmt - dfmt->idx;
 389         struct data__file *d = container_of(ptr, struct data__file, fmt);
 390
 391         return d;
 392 }
 393
 394 static struct hist_entry*
 395 get_pair_data(struct hist_entry *he, struct data__file *d)
 396 {
 397         if (hist_entry__has_pairs(he)) {
 398                 struct hist_entry *pair;
 399
 400                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 401                         if (pair->hists == d->hists)
 402                                 return pair;
 403         }
 404
 405         return NULL;
 406 }
 407
 408 static struct hist_entry*
 409 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 410 {
 411         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 412
 413         return get_pair_data(he, d);
 414 }
 415
 416 static void hists__baseline_only(struct hists *hists)
 417 {
 418         struct rb_root *root;
 419         struct rb_node *next;
 420
 421         if (hists__has(hists, need_collapse))
 422                 root = &hists->entries_collapsed;
 423         else
 424                 root = hists->entries_in;
 425
 426         next = rb_first(root);
 427         while (next != NULL) {
 428                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 429
 430                 next = rb_next(&he->rb_node_in);
 431                 if (!hist_entry__next_pair(he)) {
 432                         rb_erase(&he->rb_node_in, root);
 433                         hist_entry__delete(he);
 434                 }
 435         }
 436 }
 437
 438 static void hists__precompute(struct hists *hists)
 439 {
 440         struct rb_root *root;
 441         struct rb_node *next;
 442
 443         if (hists__has(hists, need_collapse))
 444                 root = &hists->entries_collapsed;
 445         else
 446                 root = hists->entries_in;
 447
 448         next = rb_first(root);
 449         while (next != NULL) {
 450                 struct hist_entry *he, *pair;
 451                 struct data__file *d;
 452                 int i;
 453
 454                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 455                 next = rb_next(&he->rb_node_in);
 456
 457                 data__for_each_file_new(i, d) {
 458                         pair = get_pair_data(he, d);
 459                         if (!pair)
 460                                 continue;
 461
 462                         switch (compute) {
 463                         case COMPUTE_DELTA:
 464                                 compute_delta(he, pair);
 465                                 break;
 466                         case COMPUTE_RATIO:
 467                                 compute_ratio(he, pair);
 468                                 break;
 469                         case COMPUTE_WEIGHTED_DIFF:
 470                                 compute_wdiff(he, pair);
 471                                 break;
 472                         default:
 473                                 BUG_ON(1);
 474                         }
 475                 }
 476         }
 477 }
 478
 479 static int64_t cmp_doubles(double l, double r)
 480 {
 481         if (l > r)
 482                 return -1;
 483         else if (l < r)
 484                 return 1;
 485         else
 486                 return 0;
 487 }
 488
 489 static int64_t
 490 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 491                         int c)
 492 {
 493         switch (c) {
 494         case COMPUTE_DELTA:
 495         {
 496                 double l = left->diff.period_ratio_delta;
 497                 double r = right->diff.period_ratio_delta;
 498
 499                 return cmp_doubles(l, r);
 500         }
 501         case COMPUTE_RATIO:
 502         {
 503                 double l = left->diff.period_ratio;
 504                 double r = right->diff.period_ratio;
 505
 506                 return cmp_doubles(l, r);
 507         }
 508         case COMPUTE_WEIGHTED_DIFF:
 509         {
 510                 s64 l = left->diff.wdiff;
 511                 s64 r = right->diff.wdiff;
 512
 513                 return r - l;
 514         }
 515         default:
 516                 BUG_ON(1);
 517         }
 518
 519         return 0;
 520 }
 521
 522 static int64_t
 523 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 524                         int c, int sort_idx)
 525 {
 526         bool pairs_left  = hist_entry__has_pairs(left);
 527         bool pairs_right = hist_entry__has_pairs(right);
 528         struct hist_entry *p_right, *p_left;
 529
 530         if (!pairs_left && !pairs_right)
 531                 return 0;
 532
 533         if (!pairs_left || !pairs_right)
 534                 return pairs_left ? -1 : 1;
 535
 536         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 537         p_right = get_pair_data(right, &data__files[sort_idx]);
 538
 539         if (!p_left && !p_right)
 540                 return 0;
 541
 542         if (!p_left || !p_right)
 543                 return p_left ? -1 : 1;
 544
 545         /*
 546          * We have 2 entries of same kind, let's
 547          * make the data comparison.
 548          */
 549         return __hist_entry__cmp_compute(p_left, p_right, c);
 550 }
 551
 552 static int64_t
 553 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 554                             int c, int sort_idx)
 555 {
 556         struct hist_entry *p_right, *p_left;
 557
 558         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 559         p_right = get_pair_data(right, &data__files[sort_idx]);
 560
 561         if (!p_left && !p_right)
 562                 return 0;
 563
 564         if (!p_left || !p_right)
 565                 return p_left ? -1 : 1;
 566
 567         if (c != COMPUTE_DELTA) {
 568                 /*
 569                  * The delta can be computed without the baseline, but
 570                  * others are not.  Put those entries which have no
 571                  * values below.
 572                  */
 573                 if (left->dummy && right->dummy)
 574                         return 0;
 575
 576                 if (left->dummy || right->dummy)
 577                         return left->dummy ? 1 : -1;
 578         }
 579
 580         return __hist_entry__cmp_compute(p_left, p_right, c);
 581 }
 582
 583 static int64_t
 584 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 585                     struct hist_entry *left __maybe_unused,
 586                     struct hist_entry *right __maybe_unused)
 587 {
 588         return 0;
 589 }
 590
 591 static int64_t
 592 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 593                          struct hist_entry *left, struct hist_entry *right)
 594 {
 595         if (left->stat.period == right->stat.period)
 596                 return 0;
 597         return left->stat.period > right->stat.period ? 1 : -1;
 598 }
 599
 600 static int64_t
 601 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 602                       struct hist_entry *left, struct hist_entry *right)
 603 {
 604         struct data__file *d = fmt_to_data_file(fmt);
 605
 606         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 607 }
 608
 609 static int64_t
 610 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 611                       struct hist_entry *left, struct hist_entry *right)
 612 {
 613         struct data__file *d = fmt_to_data_file(fmt);
 614
 615         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 616 }
 617
 618 static int64_t
 619 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 620                       struct hist_entry *left, struct hist_entry *right)
 621 {
 622         struct data__file *d = fmt_to_data_file(fmt);
 623
 624         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 625 }
 626
 627 static int64_t
 628 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 629                           struct hist_entry *left, struct hist_entry *right)
 630 {
 631         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 632                                            sort_compute);
 633 }
 634
 635 static int64_t
 636 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 637                           struct hist_entry *left, struct hist_entry *right)
 638 {
 639         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 640                                            sort_compute);
 641 }
 642
 643 static int64_t
 644 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 645                           struct hist_entry *left, struct hist_entry *right)
 646 {
 647         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 648                                            sort_compute);
 649 }
 650
 651 static void hists__process(struct hists *hists)
 652 {
 653         if (show_baseline_only)
 654                 hists__baseline_only(hists);
 655
 656         hists__precompute(hists);
 657         hists__output_resort(hists, NULL);
 658
 659         hists__fprintf(hists, true, 0, 0, 0, stdout,
 660                        symbol_conf.use_callchain);
 661 }
 662
 663 static void data__fprintf(void)
 664 {
 665         struct data__file *d;
 666         int i;
 667
 668         fprintf(stdout, "# Data files:\n");
 669
 670         data__for_each_file(i, d)
 671                 fprintf(stdout, "#  [%d] %s %s\n",
 672                         d->idx, d->file.path,
 673                         !d->idx ? "(Baseline)" : "");
 674
 675         fprintf(stdout, "#\n");
 676 }
 677
 678 static void data_process(void)
 679 {
 680         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 681         struct perf_evsel *evsel_base;
 682         bool first = true;
 683
 684         evlist__for_each_entry(evlist_base, evsel_base) {
 685                 struct hists *hists_base = evsel__hists(evsel_base);
 686                 struct data__file *d;
 687                 int i;
 688
 689                 data__for_each_file_new(i, d) {
 690                         struct perf_evlist *evlist = d->session->evlist;
 691                         struct perf_evsel *evsel;
 692                         struct hists *hists;
 693
 694                         evsel = evsel_match(evsel_base, evlist);
 695                         if (!evsel)
 696                                 continue;
 697
 698                         hists = evsel__hists(evsel);
 699                         d->hists = hists;
 700
 701                         hists__match(hists_base, hists);
 702
 703                         if (!show_baseline_only)
 704                                 hists__link(hists_base, hists);
 705                 }
 706
 707                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 708                         perf_evsel__name(evsel_base));
 709
 710                 first = false;
 711
 712                 if (verbose || data__files_cnt > 2)
 713                         data__fprintf();
 714
 715                 /* Don't sort callchain for perf diff */
 716                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 717
 718                 hists__process(hists_base);
 719         }
 720 }
 721
 722 static void data__free(struct data__file *d)
 723 {
 724         int col;
 725
 726         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 727                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 728
 729                 zfree(&fmt->header);
 730         }
 731 }
 732
 733 static int __cmd_diff(void)
 734 {
 735         struct data__file *d;
 736         int ret = -EINVAL, i;
 737
 738         data__for_each_file(i, d) {
 739                 d->session = perf_session__new(&d->file, false, &tool);
 740                 if (!d->session) {
 741                         pr_err("Failed to open %s\n", d->file.path);
 742                         ret = -1;
 743                         goto out_delete;
 744                 }
 745
 746                 ret = perf_session__process_events(d->session);
 747                 if (ret) {
 748                         pr_err("Failed to process %s\n", d->file.path);
 749                         goto out_delete;
 750                 }
 751
 752                 perf_evlist__collapse_resort(d->session->evlist);
 753         }
 754
 755         data_process();
 756
 757  out_delete:
 758         data__for_each_file(i, d) {
 759                 perf_session__delete(d->session);
 760                 data__free(d);
 761         }
 762
 763         free(data__files);
 764         return ret;
 765 }
 766
 767 static const char * const diff_usage[] = {
 768         "perf diff [<options>] [old_file] [new_file]",
 769         NULL,
 770 };
 771
 772 static const struct option options[] = {
 773         OPT_INCR('v', "verbose", &verbose,
 774                     "be more verbose (show symbol address, etc)"),
 775         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 776                     "Show only items with match in baseline"),
 777         OPT_CALLBACK('c', "compute", &compute,
 778                      "delta,ratio,wdiff:w1,w2 (default delta)",
 779                      "Entries differential computation selection",
 780                      setup_compute),
 781         OPT_BOOLEAN('p', "period", &show_period,
 782                     "Show period values."),
 783         OPT_BOOLEAN('F', "formula", &show_formula,
 784                     "Show formula."),
 785         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 786                     "dump raw trace in ASCII"),
 787         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 788         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
 789                    "file", "kallsyms pathname"),
 790         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 791                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 792         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 793                    "only consider symbols in these dsos"),
 794         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 795                    "only consider symbols in these comms"),
 796         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 797                    "only consider these symbols"),
 798         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 799                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 800                    " Please refer the man page for the complete list."),
 801         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
 802                    "separator for columns, no spaces will be added between "
 803                    "columns '.' is reserved."),
 804         OPT_CALLBACK(0, "symfs", NULL, "directory",
 805                      "Look for files with symbols relative to this directory",
 806                      symbol__config_symfs),
 807         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 808         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 809                      "How to display percentage of filtered entries", parse_filter_percentage),
 810         OPT_END()
 811 };
 812
 813 static double baseline_percent(struct hist_entry *he)
 814 {
 815         u64 total = hists__total_period(he->hists);
 816
 817         return 100.0 * he->stat.period / total;
 818 }
 819
 820 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 821                                struct perf_hpp *hpp, struct hist_entry *he)
 822 {
 823         struct diff_hpp_fmt *dfmt =
 824                 container_of(fmt, struct diff_hpp_fmt, fmt);
 825         double percent = baseline_percent(he);
 826         char pfmt[20] = " ";
 827
 828         if (!he->dummy) {
 829                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 830                 return percent_color_snprintf(hpp->buf, hpp->size,
 831                                               pfmt, percent);
 832         } else
 833                 return scnprintf(hpp->buf, hpp->size, "%*s",
 834                                  dfmt->header_width, pfmt);
 835 }
 836
 837 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 838 {
 839         double percent = baseline_percent(he);
 840         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 841         int ret = 0;
 842
 843         if (!he->dummy)
 844                 ret = scnprintf(buf, size, fmt, percent);
 845
 846         return ret;
 847 }
 848
 849 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 850                                 struct perf_hpp *hpp, struct hist_entry *he,
 851                                 int comparison_method)
 852 {
 853         struct diff_hpp_fmt *dfmt =
 854                 container_of(fmt, struct diff_hpp_fmt, fmt);
 855         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 856         double diff;
 857         s64 wdiff;
 858         char pfmt[20] = " ";
 859
 860         if (!pair)
 861                 goto no_print;
 862
 863         switch (comparison_method) {
 864         case COMPUTE_DELTA:
 865                 if (pair->diff.computed)
 866                         diff = pair->diff.period_ratio_delta;
 867                 else
 868                         diff = compute_delta(he, pair);
 869
 870                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 871                 return percent_color_snprintf(hpp->buf, hpp->size,
 872                                         pfmt, diff);
 873         case COMPUTE_RATIO:
 874                 if (he->dummy)
 875                         goto dummy_print;
 876                 if (pair->diff.computed)
 877                         diff = pair->diff.period_ratio;
 878                 else
 879                         diff = compute_ratio(he, pair);
 880
 881                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 882                 return value_color_snprintf(hpp->buf, hpp->size,
 883                                         pfmt, diff);
 884         case COMPUTE_WEIGHTED_DIFF:
 885                 if (he->dummy)
 886                         goto dummy_print;
 887                 if (pair->diff.computed)
 888                         wdiff = pair->diff.wdiff;
 889                 else
 890                         wdiff = compute_wdiff(he, pair);
 891
 892                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 893                 return color_snprintf(hpp->buf, hpp->size,
 894                                 get_percent_color(wdiff),
 895                                 pfmt, wdiff);
 896         default:
 897                 BUG_ON(1);
 898         }
 899 dummy_print:
 900         return scnprintf(hpp->buf, hpp->size, "%*s",
 901                         dfmt->header_width, "N/A");
 902 no_print:
 903         return scnprintf(hpp->buf, hpp->size, "%*s",
 904                         dfmt->header_width, pfmt);
 905 }
 906
 907 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 908                         struct perf_hpp *hpp, struct hist_entry *he)
 909 {
 910         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 911 }
 912
 913 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 914                         struct perf_hpp *hpp, struct hist_entry *he)
 915 {
 916         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 917 }
 918
 919 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 920                         struct perf_hpp *hpp, struct hist_entry *he)
 921 {
 922         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 923 }
 924
 925 static void
 926 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 927 {
 928         switch (idx) {
 929         case PERF_HPP_DIFF__PERIOD_BASELINE:
 930                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 931                 break;
 932
 933         default:
 934                 break;
 935         }
 936 }
 937
 938 static void
 939 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 940                 int idx, char *buf, size_t size)
 941 {
 942         double diff;
 943         double ratio;
 944         s64 wdiff;
 945
 946         switch (idx) {
 947         case PERF_HPP_DIFF__DELTA:
 948                 if (pair->diff.computed)
 949                         diff = pair->diff.period_ratio_delta;
 950                 else
 951                         diff = compute_delta(he, pair);
 952
 953                 scnprintf(buf, size, "%+4.2F%%", diff);
 954                 break;
 955
 956         case PERF_HPP_DIFF__RATIO:
 957                 /* No point for ratio number if we are dummy.. */
 958                 if (he->dummy) {
 959                         scnprintf(buf, size, "N/A");
 960                         break;
 961                 }
 962
 963                 if (pair->diff.computed)
 964                         ratio = pair->diff.period_ratio;
 965                 else
 966                         ratio = compute_ratio(he, pair);
 967
 968                 if (ratio > 0.0)
 969                         scnprintf(buf, size, "%14.6F", ratio);
 970                 break;
 971
 972         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 973                 /* No point for wdiff number if we are dummy.. */
 974                 if (he->dummy) {
 975                         scnprintf(buf, size, "N/A");
 976                         break;
 977                 }
 978
 979                 if (pair->diff.computed)
 980                         wdiff = pair->diff.wdiff;
 981                 else
 982                         wdiff = compute_wdiff(he, pair);
 983
 984                 if (wdiff != 0)
 985                         scnprintf(buf, size, "%14ld", wdiff);
 986                 break;
 987
 988         case PERF_HPP_DIFF__FORMULA:
 989                 formula_fprintf(he, pair, buf, size);
 990                 break;
 991
 992         case PERF_HPP_DIFF__PERIOD:
 993                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
 994                 break;
 995
 996         default:
 997                 BUG_ON(1);
 998         };
 999 }
1000
1001 static void
1002 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1003                     char *buf, size_t size)
1004 {
1005         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1006         int idx = dfmt->idx;
1007
1008         /* baseline is special */
1009         if (idx == PERF_HPP_DIFF__BASELINE)
1010                 hpp__entry_baseline(he, buf, size);
1011         else {
1012                 if (pair)
1013                         hpp__entry_pair(he, pair, idx, buf, size);
1014                 else
1015                         hpp__entry_unpair(he, idx, buf, size);
1016         }
1017 }
1018
1019 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1020                              struct hist_entry *he)
1021 {
1022         struct diff_hpp_fmt *dfmt =
1023                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1024         char buf[MAX_COL_WIDTH] = " ";
1025
1026         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1027
1028         if (symbol_conf.field_sep)
1029                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1030         else
1031                 return scnprintf(hpp->buf, hpp->size, "%*s",
1032                                  dfmt->header_width, buf);
1033 }
1034
1035 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1036                        struct hists *hists __maybe_unused,
1037                        int line __maybe_unused,
1038                        int *span __maybe_unused)
1039 {
1040         struct diff_hpp_fmt *dfmt =
1041                 container_of(fmt, struct diff_hpp_fmt, fmt);
1042
1043         BUG_ON(!dfmt->header);
1044         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1045 }
1046
1047 static int hpp__width(struct perf_hpp_fmt *fmt,
1048                       struct perf_hpp *hpp __maybe_unused,
1049                       struct hists *hists __maybe_unused)
1050 {
1051         struct diff_hpp_fmt *dfmt =
1052                 container_of(fmt, struct diff_hpp_fmt, fmt);
1053
1054         BUG_ON(dfmt->header_width <= 0);
1055         return dfmt->header_width;
1056 }
1057
1058 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1059 {
1060 #define MAX_HEADER_NAME 100
1061         char buf_indent[MAX_HEADER_NAME];
1062         char buf[MAX_HEADER_NAME];
1063         const char *header = NULL;
1064         int width = 0;
1065
1066         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1067         header = columns[dfmt->idx].name;
1068         width  = columns[dfmt->idx].width;
1069
1070         /* Only our defined HPP fmts should appear here. */
1071         BUG_ON(!header);
1072
1073         if (data__files_cnt > 2)
1074                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1075
1076 #define NAME (data__files_cnt > 2 ? buf : header)
1077         dfmt->header_width = width;
1078         width = (int) strlen(NAME);
1079         if (dfmt->header_width < width)
1080                 dfmt->header_width = width;
1081
1082         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1083                   dfmt->header_width, NAME);
1084
1085         dfmt->header = strdup(buf_indent);
1086 #undef MAX_HEADER_NAME
1087 #undef NAME
1088 }
1089
1090 static void data__hpp_register(struct data__file *d, int idx)
1091 {
1092         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1093         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1094
1095         dfmt->idx = idx;
1096
1097         fmt->header = hpp__header;
1098         fmt->width  = hpp__width;
1099         fmt->entry  = hpp__entry_global;
1100         fmt->cmp    = hist_entry__cmp_nop;
1101         fmt->collapse = hist_entry__cmp_nop;
1102
1103         /* TODO more colors */
1104         switch (idx) {
1105         case PERF_HPP_DIFF__BASELINE:
1106                 fmt->color = hpp__color_baseline;
1107                 fmt->sort  = hist_entry__cmp_baseline;
1108                 break;
1109         case PERF_HPP_DIFF__DELTA:
1110                 fmt->color = hpp__color_delta;
1111                 fmt->sort  = hist_entry__cmp_delta;
1112                 break;
1113         case PERF_HPP_DIFF__RATIO:
1114                 fmt->color = hpp__color_ratio;
1115                 fmt->sort  = hist_entry__cmp_ratio;
1116                 break;
1117         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1118                 fmt->color = hpp__color_wdiff;
1119                 fmt->sort  = hist_entry__cmp_wdiff;
1120                 break;
1121         default:
1122                 fmt->sort  = hist_entry__cmp_nop;
1123                 break;
1124         }
1125
1126         init_header(d, dfmt);
1127         perf_hpp__column_register(fmt);
1128         perf_hpp__register_sort_field(fmt);
1129 }
1130
1131 static int ui_init(void)
1132 {
1133         struct data__file *d;
1134         struct perf_hpp_fmt *fmt;
1135         int i;
1136
1137         data__for_each_file(i, d) {
1138
1139                 /*
1140                  * Baseline or compute realted columns:
1141                  *
1142                  *   PERF_HPP_DIFF__BASELINE
1143                  *   PERF_HPP_DIFF__DELTA
1144                  *   PERF_HPP_DIFF__RATIO
1145                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1146                  */
1147                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1148                                           PERF_HPP_DIFF__BASELINE);
1149
1150                 /*
1151                  * And the rest:
1152                  *
1153                  * PERF_HPP_DIFF__FORMULA
1154                  * PERF_HPP_DIFF__PERIOD
1155                  * PERF_HPP_DIFF__PERIOD_BASELINE
1156                  */
1157                 if (show_formula && i)
1158                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1159
1160                 if (show_period)
1161                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1162                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1163         }
1164
1165         if (!sort_compute)
1166                 return 0;
1167
1168         /*
1169          * Prepend an fmt to sort on columns at 'sort_compute' first.
1170          * This fmt is added only to the sort list but not to the
1171          * output fields list.
1172          *
1173          * Note that this column (data) can be compared twice - one
1174          * for this 'sort_compute' fmt and another for the normal
1175          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1176          * will be sorted out by first try or baseline and comparing
1177          * is not a costly operation.
1178          */
1179         fmt = zalloc(sizeof(*fmt));
1180         if (fmt == NULL) {
1181                 pr_err("Memory allocation failed\n");
1182                 return -1;
1183         }
1184
1185         fmt->cmp      = hist_entry__cmp_nop;
1186         fmt->collapse = hist_entry__cmp_nop;
1187
1188         switch (compute) {
1189         case COMPUTE_DELTA:
1190                 fmt->sort = hist_entry__cmp_delta_idx;
1191                 break;
1192         case COMPUTE_RATIO:
1193                 fmt->sort = hist_entry__cmp_ratio_idx;
1194                 break;
1195         case COMPUTE_WEIGHTED_DIFF:
1196                 fmt->sort = hist_entry__cmp_wdiff_idx;
1197                 break;
1198         default:
1199                 BUG_ON(1);
1200         }
1201
1202         perf_hpp__prepend_sort_field(fmt);
1203         return 0;
1204 }
1205
1206 static int data_init(int argc, const char **argv)
1207 {
1208         struct data__file *d;
1209         static const char *defaults[] = {
1210                 "perf.data.old",
1211                 "perf.data",
1212         };
1213         bool use_default = true;
1214         int i;
1215
1216         data__files_cnt = 2;
1217
1218         if (argc) {
1219                 if (argc == 1)
1220                         defaults[1] = argv[0];
1221                 else {
1222                         data__files_cnt = argc;
1223                         use_default = false;
1224                 }
1225         } else if (perf_guest) {
1226                 defaults[0] = "perf.data.host";
1227                 defaults[1] = "perf.data.guest";
1228         }
1229
1230         if (sort_compute >= (unsigned int) data__files_cnt) {
1231                 pr_err("Order option out of limit.\n");
1232                 return -EINVAL;
1233         }
1234
1235         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1236         if (!data__files)
1237                 return -ENOMEM;
1238
1239         data__for_each_file(i, d) {
1240                 struct perf_data_file *file = &d->file;
1241
1242                 file->path  = use_default ? defaults[i] : argv[i];
1243                 file->mode  = PERF_DATA_MODE_READ,
1244                 file->force = force,
1245
1246                 d->idx  = i;
1247         }
1248
1249         return 0;
1250 }
1251
1252 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1253 {
1254         int ret = hists__init();
1255
1256         if (ret < 0)
1257                 return ret;
1258
1259         argc = parse_options(argc, argv, options, diff_usage, 0);
1260
1261         if (symbol__init(NULL) < 0)
1262                 return -1;
1263
1264         if (data_init(argc, argv) < 0)
1265                 return -1;
1266
1267         if (ui_init() < 0)
1268                 return -1;
1269
1270         sort__mode = SORT_MODE__DIFF;
1271
1272         if (setup_sorting(NULL) < 0)
1273                 usage_with_options(diff_usage, options);
1274
1275         setup_pager();
1276
1277         sort__setup_elide(NULL);
1278
1279         return __cmd_diff();
1280 }