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 (sort__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 (sort__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 }
 671
 672 static void data__fprintf(void)
 673 {
 674         struct data__file *d;
 675         int i;
 676
 677         fprintf(stdout, "# Data files:\n");
 678
 679         data__for_each_file(i, d)
 680                 fprintf(stdout, "#  [%d] %s %s\n",
 681                         d->idx, d->file.path,
 682                         !d->idx ? "(Baseline)" : "");
 683
 684         fprintf(stdout, "#\n");
 685 }
 686
 687 static void data_process(void)
 688 {
 689         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 690         struct perf_evsel *evsel_base;
 691         bool first = true;
 692
 693         evlist__for_each(evlist_base, evsel_base) {
 694                 struct hists *hists_base = evsel__hists(evsel_base);
 695                 struct data__file *d;
 696                 int i;
 697
 698                 data__for_each_file_new(i, d) {
 699                         struct perf_evlist *evlist = d->session->evlist;
 700                         struct perf_evsel *evsel;
 701                         struct hists *hists;
 702
 703                         evsel = evsel_match(evsel_base, evlist);
 704                         if (!evsel)
 705                                 continue;
 706
 707                         hists = evsel__hists(evsel);
 708                         d->hists = hists;
 709
 710                         hists__match(hists_base, hists);
 711
 712                         if (!show_baseline_only)
 713                                 hists__link(hists_base, hists);
 714                 }
 715
 716                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 717                         perf_evsel__name(evsel_base));
 718
 719                 first = false;
 720
 721                 if (verbose || data__files_cnt > 2)
 722                         data__fprintf();
 723
 724                 /* Don't sort callchain for perf diff */
 725                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 726
 727                 hists__process(hists_base);
 728         }
 729 }
 730
 731 static void data__free(struct data__file *d)
 732 {
 733         int col;
 734
 735         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 736                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 737
 738                 zfree(&fmt->header);
 739         }
 740 }
 741
 742 static int __cmd_diff(void)
 743 {
 744         struct data__file *d;
 745         int ret = -EINVAL, i;
 746
 747         data__for_each_file(i, d) {
 748                 d->session = perf_session__new(&d->file, false, &tool);
 749                 if (!d->session) {
 750                         pr_err("Failed to open %s\n", d->file.path);
 751                         ret = -1;
 752                         goto out_delete;
 753                 }
 754
 755                 ret = perf_session__process_events(d->session);
 756                 if (ret) {
 757                         pr_err("Failed to process %s\n", d->file.path);
 758                         goto out_delete;
 759                 }
 760
 761                 perf_evlist__collapse_resort(d->session->evlist);
 762         }
 763
 764         data_process();
 765
 766  out_delete:
 767         data__for_each_file(i, d) {
 768                 if (d->session)
 769                         perf_session__delete(d->session);
 770
 771                 data__free(d);
 772         }
 773
 774         free(data__files);
 775         return ret;
 776 }
 777
 778 static const char * const diff_usage[] = {
 779         "perf diff [<options>] [old_file] [new_file]",
 780         NULL,
 781 };
 782
 783 static const struct option options[] = {
 784         OPT_INCR('v', "verbose", &verbose,
 785                     "be more verbose (show symbol address, etc)"),
 786         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 787                     "Show only items with match in baseline"),
 788         OPT_CALLBACK('c', "compute", &compute,
 789                      "delta,ratio,wdiff:w1,w2 (default delta)",
 790                      "Entries differential computation selection",
 791                      setup_compute),
 792         OPT_BOOLEAN('p', "period", &show_period,
 793                     "Show period values."),
 794         OPT_BOOLEAN('F', "formula", &show_formula,
 795                     "Show formula."),
 796         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 797                     "dump raw trace in ASCII"),
 798         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 799         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
 800                    "file", "kallsyms pathname"),
 801         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 802                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 803         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 804                    "only consider symbols in these dsos"),
 805         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 806                    "only consider symbols in these comms"),
 807         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 808                    "only consider these symbols"),
 809         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 810                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 811                    " Please refer the man page for the complete list."),
 812         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
 813                    "separator for columns, no spaces will be added between "
 814                    "columns '.' is reserved."),
 815         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 816                     "Look for files with symbols relative to this directory"),
 817         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 818         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 819                      "How to display percentage of filtered entries", parse_filter_percentage),
 820         OPT_END()
 821 };
 822
 823 static double baseline_percent(struct hist_entry *he)
 824 {
 825         u64 total = hists__total_period(he->hists);
 826
 827         return 100.0 * he->stat.period / total;
 828 }
 829
 830 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 831                                struct perf_hpp *hpp, struct hist_entry *he)
 832 {
 833         struct diff_hpp_fmt *dfmt =
 834                 container_of(fmt, struct diff_hpp_fmt, fmt);
 835         double percent = baseline_percent(he);
 836         char pfmt[20] = " ";
 837
 838         if (!he->dummy) {
 839                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 840                 return percent_color_snprintf(hpp->buf, hpp->size,
 841                                               pfmt, percent);
 842         } else
 843                 return scnprintf(hpp->buf, hpp->size, "%*s",
 844                                  dfmt->header_width, pfmt);
 845 }
 846
 847 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 848 {
 849         double percent = baseline_percent(he);
 850         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 851         int ret = 0;
 852
 853         if (!he->dummy)
 854                 ret = scnprintf(buf, size, fmt, percent);
 855
 856         return ret;
 857 }
 858
 859 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 860                                 struct perf_hpp *hpp, struct hist_entry *he,
 861                                 int comparison_method)
 862 {
 863         struct diff_hpp_fmt *dfmt =
 864                 container_of(fmt, struct diff_hpp_fmt, fmt);
 865         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 866         double diff;
 867         s64 wdiff;
 868         char pfmt[20] = " ";
 869
 870         if (!pair)
 871                 goto no_print;
 872
 873         switch (comparison_method) {
 874         case COMPUTE_DELTA:
 875                 if (pair->diff.computed)
 876                         diff = pair->diff.period_ratio_delta;
 877                 else
 878                         diff = compute_delta(he, pair);
 879
 880                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 881                 return percent_color_snprintf(hpp->buf, hpp->size,
 882                                         pfmt, diff);
 883         case COMPUTE_RATIO:
 884                 if (he->dummy)
 885                         goto dummy_print;
 886                 if (pair->diff.computed)
 887                         diff = pair->diff.period_ratio;
 888                 else
 889                         diff = compute_ratio(he, pair);
 890
 891                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 892                 return value_color_snprintf(hpp->buf, hpp->size,
 893                                         pfmt, diff);
 894         case COMPUTE_WEIGHTED_DIFF:
 895                 if (he->dummy)
 896                         goto dummy_print;
 897                 if (pair->diff.computed)
 898                         wdiff = pair->diff.wdiff;
 899                 else
 900                         wdiff = compute_wdiff(he, pair);
 901
 902                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 903                 return color_snprintf(hpp->buf, hpp->size,
 904                                 get_percent_color(wdiff),
 905                                 pfmt, wdiff);
 906         default:
 907                 BUG_ON(1);
 908         }
 909 dummy_print:
 910         return scnprintf(hpp->buf, hpp->size, "%*s",
 911                         dfmt->header_width, "N/A");
 912 no_print:
 913         return scnprintf(hpp->buf, hpp->size, "%*s",
 914                         dfmt->header_width, pfmt);
 915 }
 916
 917 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 918                         struct perf_hpp *hpp, struct hist_entry *he)
 919 {
 920         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 921 }
 922
 923 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 924                         struct perf_hpp *hpp, struct hist_entry *he)
 925 {
 926         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 927 }
 928
 929 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 930                         struct perf_hpp *hpp, struct hist_entry *he)
 931 {
 932         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 933 }
 934
 935 static void
 936 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 937 {
 938         switch (idx) {
 939         case PERF_HPP_DIFF__PERIOD_BASELINE:
 940                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 941                 break;
 942
 943         default:
 944                 break;
 945         }
 946 }
 947
 948 static void
 949 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 950                 int idx, char *buf, size_t size)
 951 {
 952         double diff;
 953         double ratio;
 954         s64 wdiff;
 955
 956         switch (idx) {
 957         case PERF_HPP_DIFF__DELTA:
 958                 if (pair->diff.computed)
 959                         diff = pair->diff.period_ratio_delta;
 960                 else
 961                         diff = compute_delta(he, pair);
 962
 963                 scnprintf(buf, size, "%+4.2F%%", diff);
 964                 break;
 965
 966         case PERF_HPP_DIFF__RATIO:
 967                 /* No point for ratio number if we are dummy.. */
 968                 if (he->dummy) {
 969                         scnprintf(buf, size, "N/A");
 970                         break;
 971                 }
 972
 973                 if (pair->diff.computed)
 974                         ratio = pair->diff.period_ratio;
 975                 else
 976                         ratio = compute_ratio(he, pair);
 977
 978                 if (ratio > 0.0)
 979                         scnprintf(buf, size, "%14.6F", ratio);
 980                 break;
 981
 982         case PERF_HPP_DIFF__WEIGHTED_DIFF:
 983                 /* No point for wdiff number if we are dummy.. */
 984                 if (he->dummy) {
 985                         scnprintf(buf, size, "N/A");
 986                         break;
 987                 }
 988
 989                 if (pair->diff.computed)
 990                         wdiff = pair->diff.wdiff;
 991                 else
 992                         wdiff = compute_wdiff(he, pair);
 993
 994                 if (wdiff != 0)
 995                         scnprintf(buf, size, "%14ld", wdiff);
 996                 break;
 997
 998         case PERF_HPP_DIFF__FORMULA:
 999                 formula_fprintf(he, pair, buf, size);
1000                 break;
1001
1002         case PERF_HPP_DIFF__PERIOD:
1003                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1004                 break;
1005
1006         default:
1007                 BUG_ON(1);
1008         };
1009 }
1010
1011 static void
1012 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1013                     char *buf, size_t size)
1014 {
1015         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1016         int idx = dfmt->idx;
1017
1018         /* baseline is special */
1019         if (idx == PERF_HPP_DIFF__BASELINE)
1020                 hpp__entry_baseline(he, buf, size);
1021         else {
1022                 if (pair)
1023                         hpp__entry_pair(he, pair, idx, buf, size);
1024                 else
1025                         hpp__entry_unpair(he, idx, buf, size);
1026         }
1027 }
1028
1029 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1030                              struct hist_entry *he)
1031 {
1032         struct diff_hpp_fmt *dfmt =
1033                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1034         char buf[MAX_COL_WIDTH] = " ";
1035
1036         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1037
1038         if (symbol_conf.field_sep)
1039                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1040         else
1041                 return scnprintf(hpp->buf, hpp->size, "%*s",
1042                                  dfmt->header_width, buf);
1043 }
1044
1045 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1046                        struct perf_evsel *evsel __maybe_unused)
1047 {
1048         struct diff_hpp_fmt *dfmt =
1049                 container_of(fmt, struct diff_hpp_fmt, fmt);
1050
1051         BUG_ON(!dfmt->header);
1052         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1053 }
1054
1055 static int hpp__width(struct perf_hpp_fmt *fmt,
1056                       struct perf_hpp *hpp __maybe_unused,
1057                       struct perf_evsel *evsel __maybe_unused)
1058 {
1059         struct diff_hpp_fmt *dfmt =
1060                 container_of(fmt, struct diff_hpp_fmt, fmt);
1061
1062         BUG_ON(dfmt->header_width <= 0);
1063         return dfmt->header_width;
1064 }
1065
1066 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1067 {
1068 #define MAX_HEADER_NAME 100
1069         char buf_indent[MAX_HEADER_NAME];
1070         char buf[MAX_HEADER_NAME];
1071         const char *header = NULL;
1072         int width = 0;
1073
1074         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1075         header = columns[dfmt->idx].name;
1076         width  = columns[dfmt->idx].width;
1077
1078         /* Only our defined HPP fmts should appear here. */
1079         BUG_ON(!header);
1080
1081         if (data__files_cnt > 2)
1082                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1083
1084 #define NAME (data__files_cnt > 2 ? buf : header)
1085         dfmt->header_width = width;
1086         width = (int) strlen(NAME);
1087         if (dfmt->header_width < width)
1088                 dfmt->header_width = width;
1089
1090         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1091                   dfmt->header_width, NAME);
1092
1093         dfmt->header = strdup(buf_indent);
1094 #undef MAX_HEADER_NAME
1095 #undef NAME
1096 }
1097
1098 static void data__hpp_register(struct data__file *d, int idx)
1099 {
1100         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1101         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1102
1103         dfmt->idx = idx;
1104
1105         fmt->header = hpp__header;
1106         fmt->width  = hpp__width;
1107         fmt->entry  = hpp__entry_global;
1108         fmt->cmp    = hist_entry__cmp_nop;
1109         fmt->collapse = hist_entry__cmp_nop;
1110
1111         /* TODO more colors */
1112         switch (idx) {
1113         case PERF_HPP_DIFF__BASELINE:
1114                 fmt->color = hpp__color_baseline;
1115                 fmt->sort  = hist_entry__cmp_baseline;
1116                 break;
1117         case PERF_HPP_DIFF__DELTA:
1118                 fmt->color = hpp__color_delta;
1119                 fmt->sort  = hist_entry__cmp_delta;
1120                 break;
1121         case PERF_HPP_DIFF__RATIO:
1122                 fmt->color = hpp__color_ratio;
1123                 fmt->sort  = hist_entry__cmp_ratio;
1124                 break;
1125         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1126                 fmt->color = hpp__color_wdiff;
1127                 fmt->sort  = hist_entry__cmp_wdiff;
1128                 break;
1129         default:
1130                 fmt->sort  = hist_entry__cmp_nop;
1131                 break;
1132         }
1133
1134         init_header(d, dfmt);
1135         perf_hpp__column_register(fmt);
1136         perf_hpp__register_sort_field(fmt);
1137 }
1138
1139 static int ui_init(void)
1140 {
1141         struct data__file *d;
1142         struct perf_hpp_fmt *fmt;
1143         int i;
1144
1145         data__for_each_file(i, d) {
1146
1147                 /*
1148                  * Baseline or compute realted columns:
1149                  *
1150                  *   PERF_HPP_DIFF__BASELINE
1151                  *   PERF_HPP_DIFF__DELTA
1152                  *   PERF_HPP_DIFF__RATIO
1153                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1154                  */
1155                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1156                                           PERF_HPP_DIFF__BASELINE);
1157
1158                 /*
1159                  * And the rest:
1160                  *
1161                  * PERF_HPP_DIFF__FORMULA
1162                  * PERF_HPP_DIFF__PERIOD
1163                  * PERF_HPP_DIFF__PERIOD_BASELINE
1164                  */
1165                 if (show_formula && i)
1166                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1167
1168                 if (show_period)
1169                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1170                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1171         }
1172
1173         if (!sort_compute)
1174                 return 0;
1175
1176         /*
1177          * Prepend an fmt to sort on columns at 'sort_compute' first.
1178          * This fmt is added only to the sort list but not to the
1179          * output fields list.
1180          *
1181          * Note that this column (data) can be compared twice - one
1182          * for this 'sort_compute' fmt and another for the normal
1183          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1184          * will be sorted out by first try or baseline and comparing
1185          * is not a costly operation.
1186          */
1187         fmt = zalloc(sizeof(*fmt));
1188         if (fmt == NULL) {
1189                 pr_err("Memory allocation failed\n");
1190                 return -1;
1191         }
1192
1193         fmt->cmp      = hist_entry__cmp_nop;
1194         fmt->collapse = hist_entry__cmp_nop;
1195
1196         switch (compute) {
1197         case COMPUTE_DELTA:
1198                 fmt->sort = hist_entry__cmp_delta_idx;
1199                 break;
1200         case COMPUTE_RATIO:
1201                 fmt->sort = hist_entry__cmp_ratio_idx;
1202                 break;
1203         case COMPUTE_WEIGHTED_DIFF:
1204                 fmt->sort = hist_entry__cmp_wdiff_idx;
1205                 break;
1206         default:
1207                 BUG_ON(1);
1208         }
1209
1210         perf_hpp__register_sort_field(fmt);
1211         return 0;
1212 }
1213
1214 static int data_init(int argc, const char **argv)
1215 {
1216         struct data__file *d;
1217         static const char *defaults[] = {
1218                 "perf.data.old",
1219                 "perf.data",
1220         };
1221         bool use_default = true;
1222         int i;
1223
1224         data__files_cnt = 2;
1225
1226         if (argc) {
1227                 if (argc == 1)
1228                         defaults[1] = argv[0];
1229                 else {
1230                         data__files_cnt = argc;
1231                         use_default = false;
1232                 }
1233         } else if (perf_guest) {
1234                 defaults[0] = "perf.data.host";
1235                 defaults[1] = "perf.data.guest";
1236         }
1237
1238         if (sort_compute >= (unsigned int) data__files_cnt) {
1239                 pr_err("Order option out of limit.\n");
1240                 return -EINVAL;
1241         }
1242
1243         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1244         if (!data__files)
1245                 return -ENOMEM;
1246
1247         data__for_each_file(i, d) {
1248                 struct perf_data_file *file = &d->file;
1249
1250                 file->path  = use_default ? defaults[i] : argv[i];
1251                 file->mode  = PERF_DATA_MODE_READ,
1252                 file->force = force,
1253
1254                 d->idx  = i;
1255         }
1256
1257         return 0;
1258 }
1259
1260 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1261 {
1262         int ret = hists__init();
1263
1264         if (ret < 0)
1265                 return ret;
1266
1267         argc = parse_options(argc, argv, options, diff_usage, 0);
1268
1269         if (symbol__init(NULL) < 0)
1270                 return -1;
1271
1272         if (data_init(argc, argv) < 0)
1273                 return -1;
1274
1275         if (ui_init() < 0)
1276                 return -1;
1277
1278         sort__mode = SORT_MODE__DIFF;
1279
1280         if (setup_sorting(NULL) < 0)
1281                 usage_with_options(diff_usage, options);
1282
1283         setup_pager();
1284
1285         sort__setup_elide(NULL);
1286
1287         return __cmd_diff();
1288 }