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         .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_entry(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_entry(evlist, evsel) {
 389                 struct hists *hists = evsel__hists(evsel);
 390
 391                 hists__collapse_resort(hists, NULL);
 392         }
 393 }
 394
 395 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 396 {
 397         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 398         void *ptr = dfmt - dfmt->idx;
 399         struct data__file *d = container_of(ptr, struct data__file, fmt);
 400
 401         return d;
 402 }
 403
 404 static struct hist_entry*
 405 get_pair_data(struct hist_entry *he, struct data__file *d)
 406 {
 407         if (hist_entry__has_pairs(he)) {
 408                 struct hist_entry *pair;
 409
 410                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 411                         if (pair->hists == d->hists)
 412                                 return pair;
 413         }
 414
 415         return NULL;
 416 }
 417
 418 static struct hist_entry*
 419 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 420 {
 421         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 422
 423         return get_pair_data(he, d);
 424 }
 425
 426 static void hists__baseline_only(struct hists *hists)
 427 {
 428         struct rb_root *root;
 429         struct rb_node *next;
 430
 431         if (hists__has(hists, need_collapse))
 432                 root = &hists->entries_collapsed;
 433         else
 434                 root = hists->entries_in;
 435
 436         next = rb_first(root);
 437         while (next != NULL) {
 438                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 439
 440                 next = rb_next(&he->rb_node_in);
 441                 if (!hist_entry__next_pair(he)) {
 442                         rb_erase(&he->rb_node_in, root);
 443                         hist_entry__delete(he);
 444                 }
 445         }
 446 }
 447
 448 static void hists__precompute(struct hists *hists)
 449 {
 450         struct rb_root *root;
 451         struct rb_node *next;
 452
 453         if (hists__has(hists, need_collapse))
 454                 root = &hists->entries_collapsed;
 455         else
 456                 root = hists->entries_in;
 457
 458         next = rb_first(root);
 459         while (next != NULL) {
 460                 struct hist_entry *he, *pair;
 461                 struct data__file *d;
 462                 int i;
 463
 464                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 465                 next = rb_next(&he->rb_node_in);
 466
 467                 data__for_each_file_new(i, d) {
 468                         pair = get_pair_data(he, d);
 469                         if (!pair)
 470                                 continue;
 471
 472                         switch (compute) {
 473                         case COMPUTE_DELTA:
 474                         case COMPUTE_DELTA_ABS:
 475                                 compute_delta(he, pair);
 476                                 break;
 477                         case COMPUTE_RATIO:
 478                                 compute_ratio(he, pair);
 479                                 break;
 480                         case COMPUTE_WEIGHTED_DIFF:
 481                                 compute_wdiff(he, pair);
 482                                 break;
 483                         default:
 484                                 BUG_ON(1);
 485                         }
 486                 }
 487         }
 488 }
 489
 490 static int64_t cmp_doubles(double l, double r)
 491 {
 492         if (l > r)
 493                 return -1;
 494         else if (l < r)
 495                 return 1;
 496         else
 497                 return 0;
 498 }
 499
 500 static int64_t
 501 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 502                         int c)
 503 {
 504         switch (c) {
 505         case COMPUTE_DELTA:
 506         {
 507                 double l = left->diff.period_ratio_delta;
 508                 double r = right->diff.period_ratio_delta;
 509
 510                 return cmp_doubles(l, r);
 511         }
 512         case COMPUTE_DELTA_ABS:
 513         {
 514                 double l = fabs(left->diff.period_ratio_delta);
 515                 double r = fabs(right->diff.period_ratio_delta);
 516
 517                 return cmp_doubles(l, r);
 518         }
 519         case COMPUTE_RATIO:
 520         {
 521                 double l = left->diff.period_ratio;
 522                 double r = right->diff.period_ratio;
 523
 524                 return cmp_doubles(l, r);
 525         }
 526         case COMPUTE_WEIGHTED_DIFF:
 527         {
 528                 s64 l = left->diff.wdiff;
 529                 s64 r = right->diff.wdiff;
 530
 531                 return r - l;
 532         }
 533         default:
 534                 BUG_ON(1);
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int64_t
 541 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 542                         int c, int sort_idx)
 543 {
 544         bool pairs_left  = hist_entry__has_pairs(left);
 545         bool pairs_right = hist_entry__has_pairs(right);
 546         struct hist_entry *p_right, *p_left;
 547
 548         if (!pairs_left && !pairs_right)
 549                 return 0;
 550
 551         if (!pairs_left || !pairs_right)
 552                 return pairs_left ? -1 : 1;
 553
 554         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 555         p_right = get_pair_data(right, &data__files[sort_idx]);
 556
 557         if (!p_left && !p_right)
 558                 return 0;
 559
 560         if (!p_left || !p_right)
 561                 return p_left ? -1 : 1;
 562
 563         /*
 564          * We have 2 entries of same kind, let's
 565          * make the data comparison.
 566          */
 567         return __hist_entry__cmp_compute(p_left, p_right, c);
 568 }
 569
 570 static int64_t
 571 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 572                             int c, int sort_idx)
 573 {
 574         struct hist_entry *p_right, *p_left;
 575
 576         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 577         p_right = get_pair_data(right, &data__files[sort_idx]);
 578
 579         if (!p_left && !p_right)
 580                 return 0;
 581
 582         if (!p_left || !p_right)
 583                 return p_left ? -1 : 1;
 584
 585         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 586                 /*
 587                  * The delta can be computed without the baseline, but
 588                  * others are not.  Put those entries which have no
 589                  * values below.
 590                  */
 591                 if (left->dummy && right->dummy)
 592                         return 0;
 593
 594                 if (left->dummy || right->dummy)
 595                         return left->dummy ? 1 : -1;
 596         }
 597
 598         return __hist_entry__cmp_compute(p_left, p_right, c);
 599 }
 600
 601 static int64_t
 602 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 603                     struct hist_entry *left __maybe_unused,
 604                     struct hist_entry *right __maybe_unused)
 605 {
 606         return 0;
 607 }
 608
 609 static int64_t
 610 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 611                          struct hist_entry *left, struct hist_entry *right)
 612 {
 613         if (left->stat.period == right->stat.period)
 614                 return 0;
 615         return left->stat.period > right->stat.period ? 1 : -1;
 616 }
 617
 618 static int64_t
 619 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 620                       struct hist_entry *left, struct hist_entry *right)
 621 {
 622         struct data__file *d = fmt_to_data_file(fmt);
 623
 624         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 625 }
 626
 627 static int64_t
 628 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
 629                       struct hist_entry *left, struct hist_entry *right)
 630 {
 631         struct data__file *d = fmt_to_data_file(fmt);
 632
 633         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
 634 }
 635
 636 static int64_t
 637 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 638                       struct hist_entry *left, struct hist_entry *right)
 639 {
 640         struct data__file *d = fmt_to_data_file(fmt);
 641
 642         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 643 }
 644
 645 static int64_t
 646 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 647                       struct hist_entry *left, struct hist_entry *right)
 648 {
 649         struct data__file *d = fmt_to_data_file(fmt);
 650
 651         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 652 }
 653
 654 static int64_t
 655 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 656                           struct hist_entry *left, struct hist_entry *right)
 657 {
 658         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 659                                            sort_compute);
 660 }
 661
 662 static int64_t
 663 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 664                               struct hist_entry *left, struct hist_entry *right)
 665 {
 666         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 667                                            sort_compute);
 668 }
 669
 670 static int64_t
 671 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 672                           struct hist_entry *left, struct hist_entry *right)
 673 {
 674         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 675                                            sort_compute);
 676 }
 677
 678 static int64_t
 679 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 680                           struct hist_entry *left, struct hist_entry *right)
 681 {
 682         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 683                                            sort_compute);
 684 }
 685
 686 static void hists__process(struct hists *hists)
 687 {
 688         if (show_baseline_only)
 689                 hists__baseline_only(hists);
 690
 691         hists__precompute(hists);
 692         hists__output_resort(hists, NULL);
 693
 694         hists__fprintf(hists, true, 0, 0, 0, stdout,
 695                        symbol_conf.use_callchain);
 696 }
 697
 698 static void data__fprintf(void)
 699 {
 700         struct data__file *d;
 701         int i;
 702
 703         fprintf(stdout, "# Data files:\n");
 704
 705         data__for_each_file(i, d)
 706                 fprintf(stdout, "#  [%d] %s %s\n",
 707                         d->idx, d->file.path,
 708                         !d->idx ? "(Baseline)" : "");
 709
 710         fprintf(stdout, "#\n");
 711 }
 712
 713 static void data_process(void)
 714 {
 715         struct perf_evlist *evlist_base = data__files[0].session->evlist;
 716         struct perf_evsel *evsel_base;
 717         bool first = true;
 718
 719         evlist__for_each_entry(evlist_base, evsel_base) {
 720                 struct hists *hists_base = evsel__hists(evsel_base);
 721                 struct data__file *d;
 722                 int i;
 723
 724                 data__for_each_file_new(i, d) {
 725                         struct perf_evlist *evlist = d->session->evlist;
 726                         struct perf_evsel *evsel;
 727                         struct hists *hists;
 728
 729                         evsel = evsel_match(evsel_base, evlist);
 730                         if (!evsel)
 731                                 continue;
 732
 733                         hists = evsel__hists(evsel);
 734                         d->hists = hists;
 735
 736                         hists__match(hists_base, hists);
 737
 738                         if (!show_baseline_only)
 739                                 hists__link(hists_base, hists);
 740                 }
 741
 742                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 743                         perf_evsel__name(evsel_base));
 744
 745                 first = false;
 746
 747                 if (verbose || data__files_cnt > 2)
 748                         data__fprintf();
 749
 750                 /* Don't sort callchain for perf diff */
 751                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
 752
 753                 hists__process(hists_base);
 754         }
 755 }
 756
 757 static void data__free(struct data__file *d)
 758 {
 759         int col;
 760
 761         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
 762                 struct diff_hpp_fmt *fmt = &d->fmt[col];
 763
 764                 zfree(&fmt->header);
 765         }
 766 }
 767
 768 static int __cmd_diff(void)
 769 {
 770         struct data__file *d;
 771         int ret = -EINVAL, i;
 772
 773         data__for_each_file(i, d) {
 774                 d->session = perf_session__new(&d->file, false, &tool);
 775                 if (!d->session) {
 776                         pr_err("Failed to open %s\n", d->file.path);
 777                         ret = -1;
 778                         goto out_delete;
 779                 }
 780
 781                 ret = perf_session__process_events(d->session);
 782                 if (ret) {
 783                         pr_err("Failed to process %s\n", d->file.path);
 784                         goto out_delete;
 785                 }
 786
 787                 perf_evlist__collapse_resort(d->session->evlist);
 788         }
 789
 790         data_process();
 791
 792  out_delete:
 793         data__for_each_file(i, d) {
 794                 perf_session__delete(d->session);
 795                 data__free(d);
 796         }
 797
 798         free(data__files);
 799         return ret;
 800 }
 801
 802 static const char * const diff_usage[] = {
 803         "perf diff [<options>] [old_file] [new_file]",
 804         NULL,
 805 };
 806
 807 static const struct option options[] = {
 808         OPT_INCR('v', "verbose", &verbose,
 809                     "be more verbose (show symbol address, etc)"),
 810         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
 811                     "Show only items with match in baseline"),
 812         OPT_CALLBACK('c', "compute", &compute,
 813                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs)",
 814                      "Entries differential computation selection",
 815                      setup_compute),
 816         OPT_BOOLEAN('p', "period", &show_period,
 817                     "Show period values."),
 818         OPT_BOOLEAN('F', "formula", &show_formula,
 819                     "Show formula."),
 820         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 821                     "dump raw trace in ASCII"),
 822         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 823         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
 824                    "file", "kallsyms pathname"),
 825         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 826                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 827         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 828                    "only consider symbols in these dsos"),
 829         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 830                    "only consider symbols in these comms"),
 831         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 832                    "only consider these symbols"),
 833         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 834                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 835                    " Please refer the man page for the complete list."),
 836         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
 837                    "separator for columns, no spaces will be added between "
 838                    "columns '.' is reserved."),
 839         OPT_CALLBACK(0, "symfs", NULL, "directory",
 840                      "Look for files with symbols relative to this directory",
 841                      symbol__config_symfs),
 842         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
 843         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
 844                      "How to display percentage of filtered entries", parse_filter_percentage),
 845         OPT_END()
 846 };
 847
 848 static double baseline_percent(struct hist_entry *he)
 849 {
 850         u64 total = hists__total_period(he->hists);
 851
 852         return 100.0 * he->stat.period / total;
 853 }
 854
 855 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
 856                                struct perf_hpp *hpp, struct hist_entry *he)
 857 {
 858         struct diff_hpp_fmt *dfmt =
 859                 container_of(fmt, struct diff_hpp_fmt, fmt);
 860         double percent = baseline_percent(he);
 861         char pfmt[20] = " ";
 862
 863         if (!he->dummy) {
 864                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
 865                 return percent_color_snprintf(hpp->buf, hpp->size,
 866                                               pfmt, percent);
 867         } else
 868                 return scnprintf(hpp->buf, hpp->size, "%*s",
 869                                  dfmt->header_width, pfmt);
 870 }
 871
 872 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
 873 {
 874         double percent = baseline_percent(he);
 875         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
 876         int ret = 0;
 877
 878         if (!he->dummy)
 879                 ret = scnprintf(buf, size, fmt, percent);
 880
 881         return ret;
 882 }
 883
 884 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
 885                                 struct perf_hpp *hpp, struct hist_entry *he,
 886                                 int comparison_method)
 887 {
 888         struct diff_hpp_fmt *dfmt =
 889                 container_of(fmt, struct diff_hpp_fmt, fmt);
 890         struct hist_entry *pair = get_pair_fmt(he, dfmt);
 891         double diff;
 892         s64 wdiff;
 893         char pfmt[20] = " ";
 894
 895         if (!pair)
 896                 goto no_print;
 897
 898         switch (comparison_method) {
 899         case COMPUTE_DELTA:
 900                 if (pair->diff.computed)
 901                         diff = pair->diff.period_ratio_delta;
 902                 else
 903                         diff = compute_delta(he, pair);
 904
 905                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
 906                 return percent_color_snprintf(hpp->buf, hpp->size,
 907                                         pfmt, diff);
 908         case COMPUTE_RATIO:
 909                 if (he->dummy)
 910                         goto dummy_print;
 911                 if (pair->diff.computed)
 912                         diff = pair->diff.period_ratio;
 913                 else
 914                         diff = compute_ratio(he, pair);
 915
 916                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
 917                 return value_color_snprintf(hpp->buf, hpp->size,
 918                                         pfmt, diff);
 919         case COMPUTE_WEIGHTED_DIFF:
 920                 if (he->dummy)
 921                         goto dummy_print;
 922                 if (pair->diff.computed)
 923                         wdiff = pair->diff.wdiff;
 924                 else
 925                         wdiff = compute_wdiff(he, pair);
 926
 927                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
 928                 return color_snprintf(hpp->buf, hpp->size,
 929                                 get_percent_color(wdiff),
 930                                 pfmt, wdiff);
 931         default:
 932                 BUG_ON(1);
 933         }
 934 dummy_print:
 935         return scnprintf(hpp->buf, hpp->size, "%*s",
 936                         dfmt->header_width, "N/A");
 937 no_print:
 938         return scnprintf(hpp->buf, hpp->size, "%*s",
 939                         dfmt->header_width, pfmt);
 940 }
 941
 942 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
 943                         struct perf_hpp *hpp, struct hist_entry *he)
 944 {
 945         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
 946 }
 947
 948 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
 949                         struct perf_hpp *hpp, struct hist_entry *he)
 950 {
 951         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
 952 }
 953
 954 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
 955                         struct perf_hpp *hpp, struct hist_entry *he)
 956 {
 957         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
 958 }
 959
 960 static void
 961 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
 962 {
 963         switch (idx) {
 964         case PERF_HPP_DIFF__PERIOD_BASELINE:
 965                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
 966                 break;
 967
 968         default:
 969                 break;
 970         }
 971 }
 972
 973 static void
 974 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
 975                 int idx, char *buf, size_t size)
 976 {
 977         double diff;
 978         double ratio;
 979         s64 wdiff;
 980
 981         switch (idx) {
 982         case PERF_HPP_DIFF__DELTA:
 983         case PERF_HPP_DIFF__DELTA_ABS:
 984                 if (pair->diff.computed)
 985                         diff = pair->diff.period_ratio_delta;
 986                 else
 987                         diff = compute_delta(he, pair);
 988
 989                 scnprintf(buf, size, "%+4.2F%%", diff);
 990                 break;
 991
 992         case PERF_HPP_DIFF__RATIO:
 993                 /* No point for ratio number if we are dummy.. */
 994                 if (he->dummy) {
 995                         scnprintf(buf, size, "N/A");
 996                         break;
 997                 }
 998
 999                 if (pair->diff.computed)
1000                         ratio = pair->diff.period_ratio;
1001                 else
1002                         ratio = compute_ratio(he, pair);
1003
1004                 if (ratio > 0.0)
1005                         scnprintf(buf, size, "%14.6F", ratio);
1006                 break;
1007
1008         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1009                 /* No point for wdiff number if we are dummy.. */
1010                 if (he->dummy) {
1011                         scnprintf(buf, size, "N/A");
1012                         break;
1013                 }
1014
1015                 if (pair->diff.computed)
1016                         wdiff = pair->diff.wdiff;
1017                 else
1018                         wdiff = compute_wdiff(he, pair);
1019
1020                 if (wdiff != 0)
1021                         scnprintf(buf, size, "%14ld", wdiff);
1022                 break;
1023
1024         case PERF_HPP_DIFF__FORMULA:
1025                 formula_fprintf(he, pair, buf, size);
1026                 break;
1027
1028         case PERF_HPP_DIFF__PERIOD:
1029                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1030                 break;
1031
1032         default:
1033                 BUG_ON(1);
1034         };
1035 }
1036
1037 static void
1038 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1039                     char *buf, size_t size)
1040 {
1041         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1042         int idx = dfmt->idx;
1043
1044         /* baseline is special */
1045         if (idx == PERF_HPP_DIFF__BASELINE)
1046                 hpp__entry_baseline(he, buf, size);
1047         else {
1048                 if (pair)
1049                         hpp__entry_pair(he, pair, idx, buf, size);
1050                 else
1051                         hpp__entry_unpair(he, idx, buf, size);
1052         }
1053 }
1054
1055 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1056                              struct hist_entry *he)
1057 {
1058         struct diff_hpp_fmt *dfmt =
1059                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1060         char buf[MAX_COL_WIDTH] = " ";
1061
1062         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1063
1064         if (symbol_conf.field_sep)
1065                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1066         else
1067                 return scnprintf(hpp->buf, hpp->size, "%*s",
1068                                  dfmt->header_width, buf);
1069 }
1070
1071 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1072                        struct hists *hists __maybe_unused,
1073                        int line __maybe_unused,
1074                        int *span __maybe_unused)
1075 {
1076         struct diff_hpp_fmt *dfmt =
1077                 container_of(fmt, struct diff_hpp_fmt, fmt);
1078
1079         BUG_ON(!dfmt->header);
1080         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1081 }
1082
1083 static int hpp__width(struct perf_hpp_fmt *fmt,
1084                       struct perf_hpp *hpp __maybe_unused,
1085                       struct hists *hists __maybe_unused)
1086 {
1087         struct diff_hpp_fmt *dfmt =
1088                 container_of(fmt, struct diff_hpp_fmt, fmt);
1089
1090         BUG_ON(dfmt->header_width <= 0);
1091         return dfmt->header_width;
1092 }
1093
1094 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1095 {
1096 #define MAX_HEADER_NAME 100
1097         char buf_indent[MAX_HEADER_NAME];
1098         char buf[MAX_HEADER_NAME];
1099         const char *header = NULL;
1100         int width = 0;
1101
1102         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1103         header = columns[dfmt->idx].name;
1104         width  = columns[dfmt->idx].width;
1105
1106         /* Only our defined HPP fmts should appear here. */
1107         BUG_ON(!header);
1108
1109         if (data__files_cnt > 2)
1110                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1111
1112 #define NAME (data__files_cnt > 2 ? buf : header)
1113         dfmt->header_width = width;
1114         width = (int) strlen(NAME);
1115         if (dfmt->header_width < width)
1116                 dfmt->header_width = width;
1117
1118         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1119                   dfmt->header_width, NAME);
1120
1121         dfmt->header = strdup(buf_indent);
1122 #undef MAX_HEADER_NAME
1123 #undef NAME
1124 }
1125
1126 static void data__hpp_register(struct data__file *d, int idx)
1127 {
1128         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1129         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1130
1131         dfmt->idx = idx;
1132
1133         fmt->header = hpp__header;
1134         fmt->width  = hpp__width;
1135         fmt->entry  = hpp__entry_global;
1136         fmt->cmp    = hist_entry__cmp_nop;
1137         fmt->collapse = hist_entry__cmp_nop;
1138
1139         /* TODO more colors */
1140         switch (idx) {
1141         case PERF_HPP_DIFF__BASELINE:
1142                 fmt->color = hpp__color_baseline;
1143                 fmt->sort  = hist_entry__cmp_baseline;
1144                 break;
1145         case PERF_HPP_DIFF__DELTA:
1146                 fmt->color = hpp__color_delta;
1147                 fmt->sort  = hist_entry__cmp_delta;
1148                 break;
1149         case PERF_HPP_DIFF__RATIO:
1150                 fmt->color = hpp__color_ratio;
1151                 fmt->sort  = hist_entry__cmp_ratio;
1152                 break;
1153         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1154                 fmt->color = hpp__color_wdiff;
1155                 fmt->sort  = hist_entry__cmp_wdiff;
1156                 break;
1157         case PERF_HPP_DIFF__DELTA_ABS:
1158                 fmt->color = hpp__color_delta;
1159                 fmt->sort  = hist_entry__cmp_delta_abs;
1160                 break;
1161         default:
1162                 fmt->sort  = hist_entry__cmp_nop;
1163                 break;
1164         }
1165
1166         init_header(d, dfmt);
1167         perf_hpp__column_register(fmt);
1168         perf_hpp__register_sort_field(fmt);
1169 }
1170
1171 static int ui_init(void)
1172 {
1173         struct data__file *d;
1174         struct perf_hpp_fmt *fmt;
1175         int i;
1176
1177         data__for_each_file(i, d) {
1178
1179                 /*
1180                  * Baseline or compute realted columns:
1181                  *
1182                  *   PERF_HPP_DIFF__BASELINE
1183                  *   PERF_HPP_DIFF__DELTA
1184                  *   PERF_HPP_DIFF__RATIO
1185                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1186                  */
1187                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1188                                           PERF_HPP_DIFF__BASELINE);
1189
1190                 /*
1191                  * And the rest:
1192                  *
1193                  * PERF_HPP_DIFF__FORMULA
1194                  * PERF_HPP_DIFF__PERIOD
1195                  * PERF_HPP_DIFF__PERIOD_BASELINE
1196                  */
1197                 if (show_formula && i)
1198                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1199
1200                 if (show_period)
1201                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1202                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1203         }
1204
1205         if (!sort_compute)
1206                 return 0;
1207
1208         /*
1209          * Prepend an fmt to sort on columns at 'sort_compute' first.
1210          * This fmt is added only to the sort list but not to the
1211          * output fields list.
1212          *
1213          * Note that this column (data) can be compared twice - one
1214          * for this 'sort_compute' fmt and another for the normal
1215          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1216          * will be sorted out by first try or baseline and comparing
1217          * is not a costly operation.
1218          */
1219         fmt = zalloc(sizeof(*fmt));
1220         if (fmt == NULL) {
1221                 pr_err("Memory allocation failed\n");
1222                 return -1;
1223         }
1224
1225         fmt->cmp      = hist_entry__cmp_nop;
1226         fmt->collapse = hist_entry__cmp_nop;
1227
1228         switch (compute) {
1229         case COMPUTE_DELTA:
1230                 fmt->sort = hist_entry__cmp_delta_idx;
1231                 break;
1232         case COMPUTE_RATIO:
1233                 fmt->sort = hist_entry__cmp_ratio_idx;
1234                 break;
1235         case COMPUTE_WEIGHTED_DIFF:
1236                 fmt->sort = hist_entry__cmp_wdiff_idx;
1237                 break;
1238         case COMPUTE_DELTA_ABS:
1239                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1240                 break;
1241         default:
1242                 BUG_ON(1);
1243         }
1244
1245         perf_hpp__prepend_sort_field(fmt);
1246         return 0;
1247 }
1248
1249 static int data_init(int argc, const char **argv)
1250 {
1251         struct data__file *d;
1252         static const char *defaults[] = {
1253                 "perf.data.old",
1254                 "perf.data",
1255         };
1256         bool use_default = true;
1257         int i;
1258
1259         data__files_cnt = 2;
1260
1261         if (argc) {
1262                 if (argc == 1)
1263                         defaults[1] = argv[0];
1264                 else {
1265                         data__files_cnt = argc;
1266                         use_default = false;
1267                 }
1268         } else if (perf_guest) {
1269                 defaults[0] = "perf.data.host";
1270                 defaults[1] = "perf.data.guest";
1271         }
1272
1273         if (sort_compute >= (unsigned int) data__files_cnt) {
1274                 pr_err("Order option out of limit.\n");
1275                 return -EINVAL;
1276         }
1277
1278         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1279         if (!data__files)
1280                 return -ENOMEM;
1281
1282         data__for_each_file(i, d) {
1283                 struct perf_data_file *file = &d->file;
1284
1285                 file->path  = use_default ? defaults[i] : argv[i];
1286                 file->mode  = PERF_DATA_MODE_READ,
1287                 file->force = force,
1288
1289                 d->idx  = i;
1290         }
1291
1292         return 0;
1293 }
1294
1295 static int diff__config(const char *var, const char *value,
1296                         void *cb __maybe_unused)
1297 {
1298         if (!strcmp(var, "diff.order")) {
1299                 sort_compute = perf_config_int(var, value);
1300                 return 0;
1301         }
1302         if (!strcmp(var, "diff.compute")) {
1303                 if (!strcmp(value, "delta")) {
1304                         compute = COMPUTE_DELTA;
1305                 } else if (!strcmp(value, "delta-abs")) {
1306                         compute = COMPUTE_DELTA_ABS;
1307                 } else if (!strcmp(value, "ratio")) {
1308                         compute = COMPUTE_RATIO;
1309                 } else if (!strcmp(value, "wdiff")) {
1310                         compute = COMPUTE_WEIGHTED_DIFF;
1311                 } else {
1312                         pr_err("Invalid compute method: %s\n", value);
1313                         return -1;
1314                 }
1315         }
1316
1317         return 0;
1318 }
1319
1320 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1321 {
1322         int ret = hists__init();
1323
1324         if (ret < 0)
1325                 return ret;
1326
1327         perf_config(diff__config, NULL);
1328
1329         argc = parse_options(argc, argv, options, diff_usage, 0);
1330
1331         if (symbol__init(NULL) < 0)
1332                 return -1;
1333
1334         if (data_init(argc, argv) < 0)
1335                 return -1;
1336
1337         if (ui_init() < 0)
1338                 return -1;
1339
1340         sort__mode = SORT_MODE__DIFF;
1341
1342         if (setup_sorting(NULL) < 0)
1343                 usage_with_options(diff_usage, options);
1344
1345         setup_pager();
1346
1347         sort__setup_elide(NULL);
1348
1349         return __cmd_diff();
1350 }