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 #include "util/config.h"
  21
  22 #include <stdlib.h>
  23 #include <math.h>
  24
  25 /* Diff command specific HPP columns. */
  26 enum {
  27         PERF_HPP_DIFF__BASELINE,
  28         PERF_HPP_DIFF__PERIOD,
  29         PERF_HPP_DIFF__PERIOD_BASELINE,
  30         PERF_HPP_DIFF__DELTA,
  31         PERF_HPP_DIFF__RATIO,
  32         PERF_HPP_DIFF__WEIGHTED_DIFF,
  33         PERF_HPP_DIFF__FORMULA,
  34         PERF_HPP_DIFF__DELTA_ABS,
  35
  36         PERF_HPP_DIFF__MAX_INDEX
  37 };
  38
  39 struct diff_hpp_fmt {
  40         struct perf_hpp_fmt      fmt;
  41         int                      idx;
  42         char                    *header;
  43         int                      header_width;
  44 };
  45
  46 struct data__file {
  47         struct perf_session     *session;
  48         struct perf_data_file   file;
  49         int                      idx;
  50         struct hists            *hists;
  51         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
  52 };
  53
  54 static struct data__file *data__files;
  55 static int data__files_cnt;
  56
  57 #define data__for_each_file_start(i, d, s)      \
  58         for (i = s, d = &data__files[s];        \
  59              i < data__files_cnt;               \
  60              i++, d = &data__files[i])
  61
  62 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  63 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  64
  65 static bool force;
  66 static bool show_period;
  67 static bool show_formula;
  68 static bool show_baseline_only;
  69 static unsigned int sort_compute = 1;
  70
  71 static s64 compute_wdiff_w1;
  72 static s64 compute_wdiff_w2;
  73
  74 enum {
  75         COMPUTE_DELTA,
  76         COMPUTE_RATIO,
  77         COMPUTE_WEIGHTED_DIFF,
  78         COMPUTE_DELTA_ABS,
  79         COMPUTE_MAX,
  80 };
  81
  82 const char *compute_names[COMPUTE_MAX] = {
  83         [COMPUTE_DELTA] = "delta",
  84         [COMPUTE_DELTA_ABS] = "delta-abs",
  85         [COMPUTE_RATIO] = "ratio",
  86         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
  87 };
  88
  89 static int compute = COMPUTE_DELTA_ABS;
  90
  91 static int compute_2_hpp[COMPUTE_MAX] = {
  92         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
  93         [COMPUTE_DELTA_ABS]     = PERF_HPP_DIFF__DELTA_ABS,
  94         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
  95         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
  96 };
  97
  98 #define MAX_COL_WIDTH 70
  99
 100 static struct header_column {
 101         const char *name;
 102         int width;
 103 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
 104         [PERF_HPP_DIFF__BASELINE] = {
 105                 .name  = "Baseline",
 106         },
 107         [PERF_HPP_DIFF__PERIOD] = {
 108                 .name  = "Period",
 109                 .width = 14,
 110         },
 111         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 112                 .name  = "Base period",
 113                 .width = 14,
 114         },
 115         [PERF_HPP_DIFF__DELTA] = {
 116                 .name  = "Delta",
 117                 .width = 7,
 118         },
 119         [PERF_HPP_DIFF__DELTA_ABS] = {
 120                 .name  = "Delta Abs",
 121                 .width = 7,
 122         },
 123         [PERF_HPP_DIFF__RATIO] = {
 124                 .name  = "Ratio",
 125                 .width = 14,
 126         },
 127         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 128                 .name  = "Weighted diff",
 129                 .width = 14,
 130         },
 131         [PERF_HPP_DIFF__FORMULA] = {
 132                 .name  = "Formula",
 133                 .width = MAX_COL_WIDTH,
 134         }
 135 };
 136
 137 static int setup_compute_opt_wdiff(char *opt)
 138 {
 139         char *w1_str = opt;
 140         char *w2_str;
 141
 142         int ret = -EINVAL;
 143
 144         if (!opt)
 145                 goto out;
 146
 147         w2_str = strchr(opt, ',');
 148         if (!w2_str)
 149                 goto out;
 150
 151         *w2_str++ = 0x0;
 152         if (!*w2_str)
 153                 goto out;
 154
 155         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 156         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 157
 158         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 159                 goto out;
 160
 161         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 162                   compute_wdiff_w1, compute_wdiff_w2);
 163
 164         ret = 0;
 165
 166  out:
 167         if (ret)
 168                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 169
 170         return ret;
 171 }
 172
 173 static int setup_compute_opt(char *opt)
 174 {
 175         if (compute == COMPUTE_WEIGHTED_DIFF)
 176                 return setup_compute_opt_wdiff(opt);
 177
 178         if (opt) {
 179                 pr_err("Failed: extra option specified '%s'", opt);
 180                 return -EINVAL;
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int setup_compute(const struct option *opt, const char *str,
 187                          int unset __maybe_unused)
 188 {
 189         int *cp = (int *) opt->value;
 190         char *cstr = (char *) str;
 191         char buf[50];
 192         unsigned i;
 193         char *option;
 194
 195         if (!str) {
 196                 *cp = COMPUTE_DELTA;
 197                 return 0;
 198         }
 199
 200         option = strchr(str, ':');
 201         if (option) {
 202                 unsigned len = option++ - str;
 203
 204                 /*
 205                  * The str data are not writeable, so we need
 206                  * to use another buffer.
 207                  */
 208
 209                 /* No option value is longer. */
 210                 if (len >= sizeof(buf))
 211                         return -EINVAL;
 212
 213                 strncpy(buf, str, len);
 214                 buf[len] = 0x0;
 215                 cstr = buf;
 216         }
 217
 218         for (i = 0; i < COMPUTE_MAX; i++)
 219                 if (!strcmp(cstr, compute_names[i])) {
 220                         *cp = i;
 221                         return setup_compute_opt(option);
 222                 }
 223
 224         pr_err("Failed: '%s' is not computation method "
 225                "(use 'delta','ratio' or 'wdiff')\n", str);
 226         return -EINVAL;
 227 }
 228
 229 static double period_percent(struct hist_entry *he, u64 period)
 230 {
 231         u64 total = hists__total_period(he->hists);
 232
 233         return (period * 100.0) / total;
 234 }
 235
 236 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 237 {
 238         double old_percent = period_percent(he, he->stat.period);
 239         double new_percent = period_percent(pair, pair->stat.period);
 240
 241         pair->diff.period_ratio_delta = new_percent - old_percent;
 242         pair->diff.computed = true;
 243         return pair->diff.period_ratio_delta;
 244 }
 245
 246 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 247 {
 248         double old_period = he->stat.period ?: 1;
 249         double new_period = pair->stat.period;
 250
 251         pair->diff.computed = true;
 252         pair->diff.period_ratio = new_period / old_period;
 253         return pair->diff.period_ratio;
 254 }
 255
 256 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 257 {
 258         u64 old_period = he->stat.period;
 259         u64 new_period = pair->stat.period;
 260
 261         pair->diff.computed = true;
 262         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 263                            old_period * compute_wdiff_w1;
 264
 265         return pair->diff.wdiff;
 266 }
 267
 268 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 269                          char *buf, size_t size)
 270 {
 271         u64 he_total = he->hists->stats.total_period;
 272         u64 pair_total = pair->hists->stats.total_period;
 273
 274         if (symbol_conf.filter_relative) {
 275                 he_total = he->hists->stats.total_non_filtered_period;
 276                 pair_total = pair->hists->stats.total_non_filtered_period;
 277         }
 278         return scnprintf(buf, size,
 279                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 280                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 281                          pair->stat.period, pair_total,
 282                          he->stat.period, he_total);
 283 }
 284
 285 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 286                          char *buf, size_t size)
 287 {
 288         double old_period = he->stat.period;
 289         double new_period = pair->stat.period;
 290
 291         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 292 }
 293
 294 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 295                          char *buf, size_t size)
 296 {
 297         u64 old_period = he->stat.period;
 298         u64 new_period = pair->stat.period;
 299
 300         return scnprintf(buf, size,
 301                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 302                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 303 }
 304
 305 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 306                            char *buf, size_t size)
 307 {
 308         switch (compute) {
 309         case COMPUTE_DELTA:
 310         case COMPUTE_DELTA_ABS:
 311                 return formula_delta(he, pair, buf, size);
 312         case COMPUTE_RATIO:
 313                 return formula_ratio(he, pair, buf, size);
 314         case COMPUTE_WEIGHTED_DIFF:
 315                 return formula_wdiff(he, pair, buf, size);
 316         default:
 317                 BUG_ON(1);
 318         }
 319
 320         return -1;
 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, NULL, NULL, NULL, sample, true)) {
 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         .namespaces = perf_event__process_namespaces,
 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_entry(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_entry(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 (hists__has(hists, 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 (hists__has(hists, 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                         case COMPUTE_DELTA_ABS:
 476                                 compute_delta(he, pair);
 477                                 break;
 478                         case COMPUTE_RATIO:
 479                                 compute_ratio(he, pair);
 480                                 break;
 481                         case COMPUTE_WEIGHTED_DIFF:
 482                                 compute_wdiff(he, pair);
 483                                 break;
 484                         default:
 485                                 BUG_ON(1);
 486                         }
 487                 }
 488         }
 489 }
 490
 491 static int64_t cmp_doubles(double l, double r)
 492 {
 493         if (l > r)
 494                 return -1;
 495         else if (l < r)
 496                 return 1;
 497         else
 498                 return 0;
 499 }
 500
 501 static int64_t
 502 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 503                         int c)
 504 {
 505         switch (c) {
 506         case COMPUTE_DELTA:
 507         {
 508                 double l = left->diff.period_ratio_delta;
 509                 double r = right->diff.period_ratio_delta;
 510
 511                 return cmp_doubles(l, r);
 512         }
 513         case COMPUTE_DELTA_ABS:
 514         {
 515                 double l = fabs(left->diff.period_ratio_delta);
 516                 double r = fabs(right->diff.period_ratio_delta);
 517
 518                 return cmp_doubles(l, r);
 519         }
 520         case COMPUTE_RATIO:
 521         {
 522                 double l = left->diff.period_ratio;
 523                 double r = right->diff.period_ratio;
 524
 525                 return cmp_doubles(l, r);
 526         }
 527         case COMPUTE_WEIGHTED_DIFF:
 528         {
 529                 s64 l = left->diff.wdiff;
 530                 s64 r = right->diff.wdiff;
 531
 532                 return r - l;
 533         }
 534         default:
 535                 BUG_ON(1);
 536         }
 537
 538         return 0;
 539 }
 540
 541 static int64_t
 542 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 543                         int c, int sort_idx)
 544 {
 545         bool pairs_left  = hist_entry__has_pairs(left);
 546         bool pairs_right = hist_entry__has_pairs(right);
 547         struct hist_entry *p_right, *p_left;
 548
 549         if (!pairs_left && !pairs_right)
 550                 return 0;
 551
 552         if (!pairs_left || !pairs_right)
 553                 return pairs_left ? -1 : 1;
 554
 555         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 556         p_right = get_pair_data(right, &data__files[sort_idx]);
 557
 558         if (!p_left && !p_right)
 559                 return 0;
 560
 561         if (!p_left || !p_right)
 562                 return p_left ? -1 : 1;
 563
 564         /*
 565          * We have 2 entries of same kind, let's
 566          * make the data comparison.
 567          */
 568         return __hist_entry__cmp_compute(p_left, p_right, c);
 569 }
 570
 571 static int64_t
 572 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 573                             int c, int sort_idx)
 574 {
 575         struct hist_entry *p_right, *p_left;
 576
 577         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 578         p_right = get_pair_data(right, &data__files[sort_idx]);
 579
 580         if (!p_left && !p_right)
 581                 return 0;
 582
 583         if (!p_left || !p_right)
 584                 return p_left ? -1 : 1;
 585
 586         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 587                 /*
 588                  * The delta can be computed without the baseline, but
 589                  * others are not.  Put those entries which have no
 590                  * values below.
 591                  */
 592                 if (left->dummy && right->dummy)
 593                         return 0;
 594
 595                 if (left->dummy || right->dummy)
 596                         return left->dummy ? 1 : -1;
 597         }
 598
 599         return __hist_entry__cmp_compute(p_left, p_right, c);
 600 }
 601
 602 static int64_t
 603 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 604                     struct hist_entry *left __maybe_unused,
 605                     struct hist_entry *right __maybe_unused)
 606 {
 607         return 0;
 608 }
 609
 610 static int64_t
 611 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 612                          struct hist_entry *left, struct hist_entry *right)
 613 {
 614         if (left->stat.period == right->stat.period)
 615                 return 0;
 616         return left->stat.period > right->stat.period ? 1 : -1;
 617 }
 618
 619 static int64_t
 620 hist_entry__cmp_delta(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_DELTA, d->idx);
 626 }
 627
 628 static int64_t
 629 hist_entry__cmp_delta_abs(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_DELTA_ABS, d->idx);
 635 }
 636
 637 static int64_t
 638 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 639                       struct hist_entry *left, struct hist_entry *right)
 640 {
 641         struct data__file *d = fmt_to_data_file(fmt);
 642
 643         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 644 }
 645
 646 static int64_t
 647 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 648                       struct hist_entry *left, struct hist_entry *right)
 649 {
 650         struct data__file *d = fmt_to_data_file(fmt);
 651
 652         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 653 }
 654
 655 static int64_t
 656 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 657                           struct hist_entry *left, struct hist_entry *right)
 658 {
 659         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 660                                            sort_compute);
 661 }
 662
 663 static int64_t
 664 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 665                               struct hist_entry *left, struct hist_entry *right)
 666 {
 667         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 668                                            sort_compute);
 669 }
 670
 671 static int64_t
 672 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 673                           struct hist_entry *left, struct hist_entry *right)
 674 {
 675         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 676                                            sort_compute);
 677 }
 678
 679 static int64_t
 680 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 681                           struct hist_entry *left, struct hist_entry *right)
 682 {
 683         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 684                                            sort_compute);
 685 }
 686
 687 static void hists__process(struct hists *hists)
 688 {
 689         if (show_baseline_only)
 690                 hists__baseline_only(hists);
 691
 692         hists__precompute(hists);
 693         hists__output_resort(hists, NULL);
 694
 695         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 696                        symbol_conf.use_callchain);
 697 }
 698
 699 static void data__fprintf(void)
 700 {
 701         struct data__file *d;
 702         int i;
 703
 704         fprintf(stdout, "# Data files:\n");
 705
 706         data__for_each_file(i, d)
 707                 fprintf(stdout, "#  [%d] %s %s\n",
 708                         d->idx, d->file.path,
 709                         !d->idx ? "(Baseline)" : "");
 710
 711         fprintf(stdout, "#\n");
 712 }
 713
 714 static void data_process(void)
 715 {
 716         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 717         struct perf_evsel *evsel_base;
 718         bool first = true;
 719
 720         evlist__for_each_entry(evlist_base, evsel_base) {
 721                 struct hists *hists_base = evsel__hists(evsel_base);
 722                 struct data__file *d;
 723                 int i;
 724
 725                 data__for_each_file_new(i, d) {
 726                         struct perf_evlist *evlist = d->session->evlist;
 727                         struct perf_evsel *evsel;
 728                         struct hists *hists;
 729
 730                         evsel = evsel_match(evsel_base, evlist);
 731                         if (!evsel)
 732                                 continue;
 733
 734                         hists = evsel__hists(evsel);
 735                         d->hists = hists;
 736
 737                         hists__match(hists_base, hists);
 738
 739                         if (!show_baseline_only)
 740                                 hists__link(hists_base, hists);
 741                 }
 742
 743                 if (!quiet) {
 744                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 745                                 perf_evsel__name(evsel_base));
 746                 }
 747
 748                 first = false;
 749
 750                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
 751                         data__fprintf();
 752
 753                 /* Don't sort callchain for perf diff */
 754                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 755
 756                 hists__process(hists_base);
 757         }
 758 }
 759
 760 static void data__free(struct data__file *d)
 761 {
 762         int col;
 763
 764         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 765                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 766
 767                 zfree(&fmt->header);
 768         }
 769 }
 770
 771 static int __cmd_diff(void)
 772 {
 773         struct data__file *d;
 774         int ret = -EINVAL, i;
 775
 776         data__for_each_file(i, d) {
 777                 d->session = perf_session__new(&d->file, false, &tool);
 778                 if (!d->session) {
 779                         pr_err("Failed to open %s\n", d->file.path);
 780                         ret = -1;
 781                         goto out_delete;
 782                 }
 783
 784                 ret = perf_session__process_events(d->session);
 785                 if (ret) {
 786                         pr_err("Failed to process %s\n", d->file.path);
 787                         goto out_delete;
 788                 }
 789
 790                 perf_evlist__collapse_resort(d->session->evlist);
 791         }
 792
 793         data_process();
 794
 795  out_delete:
 796         data__for_each_file(i, d) {
 797                 perf_session__delete(d->session);
 798                 data__free(d);
 799         }
 800
 801         free(data__files);
 802         return ret;
 803 }
 804
 805 static const char * const diff_usage[] = {
 806         "perf diff [<options>] [old_file] [new_file]",
 807         NULL,
 808 };
 809
 810 static const struct option options[] = {
 811         OPT_INCR('v', "verbose", &verbose,
 812                     "be more verbose (show symbol address, etc)"),
 813         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 814         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 815                     "Show only items with match in baseline"),
 816         OPT_CALLBACK('c', "compute", &compute,
 817                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs)",
 818                      "Entries differential computation selection",
 819                      setup_compute),
 820         OPT_BOOLEAN('p', "period", &show_period,
 821                     "Show period values."),
 822         OPT_BOOLEAN('F', "formula", &show_formula,
 823                     "Show formula."),
 824         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 825                     "dump raw trace in ASCII"),
 826         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 827         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
 828                    "file", "kallsyms pathname"),
 829         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 830                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 831         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 832                    "only consider symbols in these dsos"),
 833         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 834                    "only consider symbols in these comms"),
 835         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 836                    "only consider these symbols"),
 837         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 838                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 839                    " Please refer the man page for the complete list."),
 840         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
 841                    "separator for columns, no spaces will be added between "
 842                    "columns '.' is reserved."),
 843         OPT_CALLBACK(0, "symfs", NULL, "directory",
 844                      "Look for files with symbols relative to this directory",
 845                      symbol__config_symfs),
 846         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 847         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 848                      "How to display percentage of filtered entries", parse_filter_percentage),
 849         OPT_END()
 850 };
 851
 852 static double baseline_percent(struct hist_entry *he)
 853 {
 854         u64 total = hists__total_period(he->hists);
 855
 856         return 100.0 * he->stat.period / total;
 857 }
 858
 859 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 860                                struct perf_hpp *hpp, struct hist_entry *he)
 861 {
 862         struct diff_hpp_fmt *dfmt =
 863                 container_of(fmt, struct diff_hpp_fmt, fmt);
 864         double percent = baseline_percent(he);
 865         char pfmt[20] = " ";
 866
 867         if (!he->dummy) {
 868                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 869                 return percent_color_snprintf(hpp->buf, hpp->size,
 870                                               pfmt, percent);
 871         } else
 872                 return scnprintf(hpp->buf, hpp->size, "%*s",
 873                                  dfmt->header_width, pfmt);
 874 }
 875
 876 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 877 {
 878         double percent = baseline_percent(he);
 879         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 880         int ret = 0;
 881
 882         if (!he->dummy)
 883                 ret = scnprintf(buf, size, fmt, percent);
 884
 885         return ret;
 886 }
 887
 888 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 889                                 struct perf_hpp *hpp, struct hist_entry *he,
 890                                 int comparison_method)
 891 {
 892         struct diff_hpp_fmt *dfmt =
 893                 container_of(fmt, struct diff_hpp_fmt, fmt);
 894         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 895         double diff;
 896         s64 wdiff;
 897         char pfmt[20] = " ";
 898
 899         if (!pair)
 900                 goto no_print;
 901
 902         switch (comparison_method) {
 903         case COMPUTE_DELTA:
 904                 if (pair->diff.computed)
 905                         diff = pair->diff.period_ratio_delta;
 906                 else
 907                         diff = compute_delta(he, pair);
 908
 909                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 910                 return percent_color_snprintf(hpp->buf, hpp->size,
 911                                         pfmt, diff);
 912         case COMPUTE_RATIO:
 913                 if (he->dummy)
 914                         goto dummy_print;
 915                 if (pair->diff.computed)
 916                         diff = pair->diff.period_ratio;
 917                 else
 918                         diff = compute_ratio(he, pair);
 919
 920                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 921                 return value_color_snprintf(hpp->buf, hpp->size,
 922                                         pfmt, diff);
 923         case COMPUTE_WEIGHTED_DIFF:
 924                 if (he->dummy)
 925                         goto dummy_print;
 926                 if (pair->diff.computed)
 927                         wdiff = pair->diff.wdiff;
 928                 else
 929                         wdiff = compute_wdiff(he, pair);
 930
 931                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 932                 return color_snprintf(hpp->buf, hpp->size,
 933                                 get_percent_color(wdiff),
 934                                 pfmt, wdiff);
 935         default:
 936                 BUG_ON(1);
 937         }
 938 dummy_print:
 939         return scnprintf(hpp->buf, hpp->size, "%*s",
 940                         dfmt->header_width, "N/A");
 941 no_print:
 942         return scnprintf(hpp->buf, hpp->size, "%*s",
 943                         dfmt->header_width, pfmt);
 944 }
 945
 946 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 947                         struct perf_hpp *hpp, struct hist_entry *he)
 948 {
 949         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 950 }
 951
 952 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 953                         struct perf_hpp *hpp, struct hist_entry *he)
 954 {
 955         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 956 }
 957
 958 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 959                         struct perf_hpp *hpp, struct hist_entry *he)
 960 {
 961         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 962 }
 963
 964 static void
 965 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 966 {
 967         switch (idx) {
 968         case PERF_HPP_DIFF__PERIOD_BASELINE:
 969                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 970                 break;
 971
 972         default:
 973                 break;
 974         }
 975 }
 976
 977 static void
 978 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 979                 int idx, char *buf, size_t size)
 980 {
 981         double diff;
 982         double ratio;
 983         s64 wdiff;
 984
 985         switch (idx) {
 986         case PERF_HPP_DIFF__DELTA:
 987         case PERF_HPP_DIFF__DELTA_ABS:
 988                 if (pair->diff.computed)
 989                         diff = pair->diff.period_ratio_delta;
 990                 else
 991                         diff = compute_delta(he, pair);
 992
 993                 scnprintf(buf, size, "%+4.2F%%", diff);
 994                 break;
 995
 996         case PERF_HPP_DIFF__RATIO:
 997                 /* No point for ratio number if we are dummy.. */
 998                 if (he->dummy) {
 999                         scnprintf(buf, size, "N/A");
1000                         break;
1001                 }
1002
1003                 if (pair->diff.computed)
1004                         ratio = pair->diff.period_ratio;
1005                 else
1006                         ratio = compute_ratio(he, pair);
1007
1008                 if (ratio > 0.0)
1009                         scnprintf(buf, size, "%14.6F", ratio);
1010                 break;
1011
1012         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1013                 /* No point for wdiff number if we are dummy.. */
1014                 if (he->dummy) {
1015                         scnprintf(buf, size, "N/A");
1016                         break;
1017                 }
1018
1019                 if (pair->diff.computed)
1020                         wdiff = pair->diff.wdiff;
1021                 else
1022                         wdiff = compute_wdiff(he, pair);
1023
1024                 if (wdiff != 0)
1025                         scnprintf(buf, size, "%14ld", wdiff);
1026                 break;
1027
1028         case PERF_HPP_DIFF__FORMULA:
1029                 formula_fprintf(he, pair, buf, size);
1030                 break;
1031
1032         case PERF_HPP_DIFF__PERIOD:
1033                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1034                 break;
1035
1036         default:
1037                 BUG_ON(1);
1038         };
1039 }
1040
1041 static void
1042 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1043                     char *buf, size_t size)
1044 {
1045         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1046         int idx = dfmt->idx;
1047
1048         /* baseline is special */
1049         if (idx == PERF_HPP_DIFF__BASELINE)
1050                 hpp__entry_baseline(he, buf, size);
1051         else {
1052                 if (pair)
1053                         hpp__entry_pair(he, pair, idx, buf, size);
1054                 else
1055                         hpp__entry_unpair(he, idx, buf, size);
1056         }
1057 }
1058
1059 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1060                              struct hist_entry *he)
1061 {
1062         struct diff_hpp_fmt *dfmt =
1063                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1064         char buf[MAX_COL_WIDTH] = " ";
1065
1066         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1067
1068         if (symbol_conf.field_sep)
1069                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1070         else
1071                 return scnprintf(hpp->buf, hpp->size, "%*s",
1072                                  dfmt->header_width, buf);
1073 }
1074
1075 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1076                        struct hists *hists __maybe_unused,
1077                        int line __maybe_unused,
1078                        int *span __maybe_unused)
1079 {
1080         struct diff_hpp_fmt *dfmt =
1081                 container_of(fmt, struct diff_hpp_fmt, fmt);
1082
1083         BUG_ON(!dfmt->header);
1084         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1085 }
1086
1087 static int hpp__width(struct perf_hpp_fmt *fmt,
1088                       struct perf_hpp *hpp __maybe_unused,
1089                       struct hists *hists __maybe_unused)
1090 {
1091         struct diff_hpp_fmt *dfmt =
1092                 container_of(fmt, struct diff_hpp_fmt, fmt);
1093
1094         BUG_ON(dfmt->header_width <= 0);
1095         return dfmt->header_width;
1096 }
1097
1098 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1099 {
1100 #define MAX_HEADER_NAME 100
1101         char buf_indent[MAX_HEADER_NAME];
1102         char buf[MAX_HEADER_NAME];
1103         const char *header = NULL;
1104         int width = 0;
1105
1106         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1107         header = columns[dfmt->idx].name;
1108         width  = columns[dfmt->idx].width;
1109
1110         /* Only our defined HPP fmts should appear here. */
1111         BUG_ON(!header);
1112
1113         if (data__files_cnt > 2)
1114                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1115
1116 #define NAME (data__files_cnt > 2 ? buf : header)
1117         dfmt->header_width = width;
1118         width = (int) strlen(NAME);
1119         if (dfmt->header_width < width)
1120                 dfmt->header_width = width;
1121
1122         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1123                   dfmt->header_width, NAME);
1124
1125         dfmt->header = strdup(buf_indent);
1126 #undef MAX_HEADER_NAME
1127 #undef NAME
1128 }
1129
1130 static void data__hpp_register(struct data__file *d, int idx)
1131 {
1132         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1133         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1134
1135         dfmt->idx = idx;
1136
1137         fmt->header = hpp__header;
1138         fmt->width  = hpp__width;
1139         fmt->entry  = hpp__entry_global;
1140         fmt->cmp    = hist_entry__cmp_nop;
1141         fmt->collapse = hist_entry__cmp_nop;
1142
1143         /* TODO more colors */
1144         switch (idx) {
1145         case PERF_HPP_DIFF__BASELINE:
1146                 fmt->color = hpp__color_baseline;
1147                 fmt->sort  = hist_entry__cmp_baseline;
1148                 break;
1149         case PERF_HPP_DIFF__DELTA:
1150                 fmt->color = hpp__color_delta;
1151                 fmt->sort  = hist_entry__cmp_delta;
1152                 break;
1153         case PERF_HPP_DIFF__RATIO:
1154                 fmt->color = hpp__color_ratio;
1155                 fmt->sort  = hist_entry__cmp_ratio;
1156                 break;
1157         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1158                 fmt->color = hpp__color_wdiff;
1159                 fmt->sort  = hist_entry__cmp_wdiff;
1160                 break;
1161         case PERF_HPP_DIFF__DELTA_ABS:
1162                 fmt->color = hpp__color_delta;
1163                 fmt->sort  = hist_entry__cmp_delta_abs;
1164                 break;
1165         default:
1166                 fmt->sort  = hist_entry__cmp_nop;
1167                 break;
1168         }
1169
1170         init_header(d, dfmt);
1171         perf_hpp__column_register(fmt);
1172         perf_hpp__register_sort_field(fmt);
1173 }
1174
1175 static int ui_init(void)
1176 {
1177         struct data__file *d;
1178         struct perf_hpp_fmt *fmt;
1179         int i;
1180
1181         data__for_each_file(i, d) {
1182
1183                 /*
1184                  * Baseline or compute realted columns:
1185                  *
1186                  *   PERF_HPP_DIFF__BASELINE
1187                  *   PERF_HPP_DIFF__DELTA
1188                  *   PERF_HPP_DIFF__RATIO
1189                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1190                  */
1191                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1192                                           PERF_HPP_DIFF__BASELINE);
1193
1194                 /*
1195                  * And the rest:
1196                  *
1197                  * PERF_HPP_DIFF__FORMULA
1198                  * PERF_HPP_DIFF__PERIOD
1199                  * PERF_HPP_DIFF__PERIOD_BASELINE
1200                  */
1201                 if (show_formula && i)
1202                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1203
1204                 if (show_period)
1205                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1206                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1207         }
1208
1209         if (!sort_compute)
1210                 return 0;
1211
1212         /*
1213          * Prepend an fmt to sort on columns at 'sort_compute' first.
1214          * This fmt is added only to the sort list but not to the
1215          * output fields list.
1216          *
1217          * Note that this column (data) can be compared twice - one
1218          * for this 'sort_compute' fmt and another for the normal
1219          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1220          * will be sorted out by first try or baseline and comparing
1221          * is not a costly operation.
1222          */
1223         fmt = zalloc(sizeof(*fmt));
1224         if (fmt == NULL) {
1225                 pr_err("Memory allocation failed\n");
1226                 return -1;
1227         }
1228
1229         fmt->cmp      = hist_entry__cmp_nop;
1230         fmt->collapse = hist_entry__cmp_nop;
1231
1232         switch (compute) {
1233         case COMPUTE_DELTA:
1234                 fmt->sort = hist_entry__cmp_delta_idx;
1235                 break;
1236         case COMPUTE_RATIO:
1237                 fmt->sort = hist_entry__cmp_ratio_idx;
1238                 break;
1239         case COMPUTE_WEIGHTED_DIFF:
1240                 fmt->sort = hist_entry__cmp_wdiff_idx;
1241                 break;
1242         case COMPUTE_DELTA_ABS:
1243                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1244                 break;
1245         default:
1246                 BUG_ON(1);
1247         }
1248
1249         perf_hpp__prepend_sort_field(fmt);
1250         return 0;
1251 }
1252
1253 static int data_init(int argc, const char **argv)
1254 {
1255         struct data__file *d;
1256         static const char *defaults[] = {
1257                 "perf.data.old",
1258                 "perf.data",
1259         };
1260         bool use_default = true;
1261         int i;
1262
1263         data__files_cnt = 2;
1264
1265         if (argc) {
1266                 if (argc == 1)
1267                         defaults[1] = argv[0];
1268                 else {
1269                         data__files_cnt = argc;
1270                         use_default = false;
1271                 }
1272         } else if (perf_guest) {
1273                 defaults[0] = "perf.data.host";
1274                 defaults[1] = "perf.data.guest";
1275         }
1276
1277         if (sort_compute >= (unsigned int) data__files_cnt) {
1278                 pr_err("Order option out of limit.\n");
1279                 return -EINVAL;
1280         }
1281
1282         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1283         if (!data__files)
1284                 return -ENOMEM;
1285
1286         data__for_each_file(i, d) {
1287                 struct perf_data_file *file = &d->file;
1288
1289                 file->path  = use_default ? defaults[i] : argv[i];
1290                 file->mode  = PERF_DATA_MODE_READ,
1291                 file->force = force,
1292
1293                 d->idx  = i;
1294         }
1295
1296         return 0;
1297 }
1298
1299 static int diff__config(const char *var, const char *value,
1300                         void *cb __maybe_unused)
1301 {
1302         if (!strcmp(var, "diff.order")) {
1303                 sort_compute = perf_config_int(var, value);
1304                 return 0;
1305         }
1306         if (!strcmp(var, "diff.compute")) {
1307                 if (!strcmp(value, "delta")) {
1308                         compute = COMPUTE_DELTA;
1309                 } else if (!strcmp(value, "delta-abs")) {
1310                         compute = COMPUTE_DELTA_ABS;
1311                 } else if (!strcmp(value, "ratio")) {
1312                         compute = COMPUTE_RATIO;
1313                 } else if (!strcmp(value, "wdiff")) {
1314                         compute = COMPUTE_WEIGHTED_DIFF;
1315                 } else {
1316                         pr_err("Invalid compute method: %s\n", value);
1317                         return -1;
1318                 }
1319         }
1320
1321         return 0;
1322 }
1323
1324 int cmd_diff(int argc, const char **argv)
1325 {
1326         int ret = hists__init();
1327
1328         if (ret < 0)
1329                 return ret;
1330
1331         perf_config(diff__config, NULL);
1332
1333         argc = parse_options(argc, argv, options, diff_usage, 0);
1334
1335         if (quiet)
1336                 perf_quiet_option();
1337
1338         if (symbol__init(NULL) < 0)
1339                 return -1;
1340
1341         if (data_init(argc, argv) < 0)
1342                 return -1;
1343
1344         if (ui_init() < 0)
1345                 return -1;
1346
1347         sort__mode = SORT_MODE__DIFF;
1348
1349         if (setup_sorting(NULL) < 0)
1350                 usage_with_options(diff_usage, options);
1351
1352         setup_pager();
1353
1354         sort__setup_elide(NULL);
1355
1356         return __cmd_diff();
1357 }