tools/perf/builtin-diff.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * builtin-diff.c
   4  *
   5  * Builtin diff command: Analyze two perf.data input files, look up and read
   6  * DSOs and symbol information, sort them and produce a diff.
   7  */
   8 #include "builtin.h"
   9 #include "perf.h"
  10
  11 #include "util/debug.h"
  12 #include "util/event.h"
  13 #include "util/hist.h"
  14 #include "util/evsel.h"
  15 #include "util/evlist.h"
  16 #include "util/session.h"
  17 #include "util/tool.h"
  18 #include "util/sort.h"
  19 #include "util/srcline.h"
  20 #include "util/symbol.h"
  21 #include "util/data.h"
  22 #include "util/config.h"
  23 #include "util/time-utils.h"
  24 #include "util/annotate.h"
  25 #include "util/map.h"
  26 #include "util/spark.h"
  27 #include "util/block-info.h"
  28 #include "util/stream.h"
  29 #include <linux/err.h>
  30 #include <linux/zalloc.h>
  31 #include <subcmd/pager.h>
  32 #include <subcmd/parse-options.h>
  33
  34 #include <errno.h>
  35 #include <inttypes.h>
  36 #include <stdlib.h>
  37 #include <math.h>
  38
  39 struct perf_diff {
  40         struct perf_tool                 tool;
  41         const char                      *time_str;
  42         struct perf_time_interval       *ptime_range;
  43         int                              range_size;
  44         int                              range_num;
  45         bool                             has_br_stack;
  46         bool                             stream;
  47 };
  48
  49 /* Diff command specific HPP columns. */
  50 enum {
  51         PERF_HPP_DIFF__BASELINE,
  52         PERF_HPP_DIFF__PERIOD,
  53         PERF_HPP_DIFF__PERIOD_BASELINE,
  54         PERF_HPP_DIFF__DELTA,
  55         PERF_HPP_DIFF__RATIO,
  56         PERF_HPP_DIFF__WEIGHTED_DIFF,
  57         PERF_HPP_DIFF__FORMULA,
  58         PERF_HPP_DIFF__DELTA_ABS,
  59         PERF_HPP_DIFF__CYCLES,
  60         PERF_HPP_DIFF__CYCLES_HIST,
  61
  62         PERF_HPP_DIFF__MAX_INDEX
  63 };
  64
  65 struct diff_hpp_fmt {
  66         struct perf_hpp_fmt      fmt;
  67         int                      idx;
  68         char                    *header;
  69         int                      header_width;
  70 };
  71
  72 struct data__file {
  73         struct perf_session     *session;
  74         struct perf_data         data;
  75         int                      idx;
  76         struct hists            *hists;
  77         struct evlist_streams   *evlist_streams;
  78         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
  79 };
  80
  81 static struct data__file *data__files;
  82 static int data__files_cnt;
  83
  84 #define data__for_each_file_start(i, d, s)      \
  85         for (i = s, d = &data__files[s];        \
  86              i < data__files_cnt;               \
  87              i++, d = &data__files[i])
  88
  89 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  90 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  91
  92 static bool force;
  93 static bool show_period;
  94 static bool show_formula;
  95 static bool show_baseline_only;
  96 static bool cycles_hist;
  97 static unsigned int sort_compute = 1;
  98
  99 static s64 compute_wdiff_w1;
 100 static s64 compute_wdiff_w2;
 101
 102 static const char               *cpu_list;
 103 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 104
 105 enum {
 106         COMPUTE_DELTA,
 107         COMPUTE_RATIO,
 108         COMPUTE_WEIGHTED_DIFF,
 109         COMPUTE_DELTA_ABS,
 110         COMPUTE_CYCLES,
 111         COMPUTE_MAX,
 112         COMPUTE_STREAM, /* After COMPUTE_MAX to avoid use current compute arrays */
 113 };
 114
 115 const char *compute_names[COMPUTE_MAX] = {
 116         [COMPUTE_DELTA] = "delta",
 117         [COMPUTE_DELTA_ABS] = "delta-abs",
 118         [COMPUTE_RATIO] = "ratio",
 119         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
 120         [COMPUTE_CYCLES] = "cycles",
 121 };
 122
 123 static int compute = COMPUTE_DELTA_ABS;
 124
 125 static int compute_2_hpp[COMPUTE_MAX] = {
 126         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
 127         [COMPUTE_DELTA_ABS]     = PERF_HPP_DIFF__DELTA_ABS,
 128         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
 129         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
 130         [COMPUTE_CYCLES]        = PERF_HPP_DIFF__CYCLES,
 131 };
 132
 133 #define MAX_COL_WIDTH 70
 134
 135 static struct header_column {
 136         const char *name;
 137         int width;
 138 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
 139         [PERF_HPP_DIFF__BASELINE] = {
 140                 .name  = "Baseline",
 141         },
 142         [PERF_HPP_DIFF__PERIOD] = {
 143                 .name  = "Period",
 144                 .width = 14,
 145         },
 146         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 147                 .name  = "Base period",
 148                 .width = 14,
 149         },
 150         [PERF_HPP_DIFF__DELTA] = {
 151                 .name  = "Delta",
 152                 .width = 7,
 153         },
 154         [PERF_HPP_DIFF__DELTA_ABS] = {
 155                 .name  = "Delta Abs",
 156                 .width = 7,
 157         },
 158         [PERF_HPP_DIFF__RATIO] = {
 159                 .name  = "Ratio",
 160                 .width = 14,
 161         },
 162         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 163                 .name  = "Weighted diff",
 164                 .width = 14,
 165         },
 166         [PERF_HPP_DIFF__FORMULA] = {
 167                 .name  = "Formula",
 168                 .width = MAX_COL_WIDTH,
 169         },
 170         [PERF_HPP_DIFF__CYCLES] = {
 171                 .name  = "[Program Block Range] Cycles Diff",
 172                 .width = 70,
 173         },
 174         [PERF_HPP_DIFF__CYCLES_HIST] = {
 175                 .name  = "stddev/Hist",
 176                 .width = NUM_SPARKS + 9,
 177         }
 178 };
 179
 180 static int setup_compute_opt_wdiff(char *opt)
 181 {
 182         char *w1_str = opt;
 183         char *w2_str;
 184
 185         int ret = -EINVAL;
 186
 187         if (!opt)
 188                 goto out;
 189
 190         w2_str = strchr(opt, ',');
 191         if (!w2_str)
 192                 goto out;
 193
 194         *w2_str++ = 0x0;
 195         if (!*w2_str)
 196                 goto out;
 197
 198         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 199         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 200
 201         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 202                 goto out;
 203
 204         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 205                   compute_wdiff_w1, compute_wdiff_w2);
 206
 207         ret = 0;
 208
 209  out:
 210         if (ret)
 211                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 212
 213         return ret;
 214 }
 215
 216 static int setup_compute_opt(char *opt)
 217 {
 218         if (compute == COMPUTE_WEIGHTED_DIFF)
 219                 return setup_compute_opt_wdiff(opt);
 220
 221         if (opt) {
 222                 pr_err("Failed: extra option specified '%s'", opt);
 223                 return -EINVAL;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static int setup_compute(const struct option *opt, const char *str,
 230                          int unset __maybe_unused)
 231 {
 232         int *cp = (int *) opt->value;
 233         char *cstr = (char *) str;
 234         char buf[50];
 235         unsigned i;
 236         char *option;
 237
 238         if (!str) {
 239                 *cp = COMPUTE_DELTA;
 240                 return 0;
 241         }
 242
 243         option = strchr(str, ':');
 244         if (option) {
 245                 unsigned len = option++ - str;
 246
 247                 /*
 248                  * The str data are not writeable, so we need
 249                  * to use another buffer.
 250                  */
 251
 252                 /* No option value is longer. */
 253                 if (len >= sizeof(buf))
 254                         return -EINVAL;
 255
 256                 strncpy(buf, str, len);
 257                 buf[len] = 0x0;
 258                 cstr = buf;
 259         }
 260
 261         for (i = 0; i < COMPUTE_MAX; i++)
 262                 if (!strcmp(cstr, compute_names[i])) {
 263                         *cp = i;
 264                         return setup_compute_opt(option);
 265                 }
 266
 267         pr_err("Failed: '%s' is not computation method "
 268                "(use 'delta','ratio' or 'wdiff')\n", str);
 269         return -EINVAL;
 270 }
 271
 272 static double period_percent(struct hist_entry *he, u64 period)
 273 {
 274         u64 total = hists__total_period(he->hists);
 275
 276         return (period * 100.0) / total;
 277 }
 278
 279 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 280 {
 281         double old_percent = period_percent(he, he->stat.period);
 282         double new_percent = period_percent(pair, pair->stat.period);
 283
 284         pair->diff.period_ratio_delta = new_percent - old_percent;
 285         pair->diff.computed = true;
 286         return pair->diff.period_ratio_delta;
 287 }
 288
 289 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 290 {
 291         double old_period = he->stat.period ?: 1;
 292         double new_period = pair->stat.period;
 293
 294         pair->diff.computed = true;
 295         pair->diff.period_ratio = new_period / old_period;
 296         return pair->diff.period_ratio;
 297 }
 298
 299 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 300 {
 301         u64 old_period = he->stat.period;
 302         u64 new_period = pair->stat.period;
 303
 304         pair->diff.computed = true;
 305         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 306                            old_period * compute_wdiff_w1;
 307
 308         return pair->diff.wdiff;
 309 }
 310
 311 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 312                          char *buf, size_t size)
 313 {
 314         u64 he_total = he->hists->stats.total_period;
 315         u64 pair_total = pair->hists->stats.total_period;
 316
 317         if (symbol_conf.filter_relative) {
 318                 he_total = he->hists->stats.total_non_filtered_period;
 319                 pair_total = pair->hists->stats.total_non_filtered_period;
 320         }
 321         return scnprintf(buf, size,
 322                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 323                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 324                          pair->stat.period, pair_total,
 325                          he->stat.period, he_total);
 326 }
 327
 328 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 329                          char *buf, size_t size)
 330 {
 331         double old_period = he->stat.period;
 332         double new_period = pair->stat.period;
 333
 334         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 335 }
 336
 337 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 338                          char *buf, size_t size)
 339 {
 340         u64 old_period = he->stat.period;
 341         u64 new_period = pair->stat.period;
 342
 343         return scnprintf(buf, size,
 344                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 345                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 346 }
 347
 348 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 349                            char *buf, size_t size)
 350 {
 351         switch (compute) {
 352         case COMPUTE_DELTA:
 353         case COMPUTE_DELTA_ABS:
 354                 return formula_delta(he, pair, buf, size);
 355         case COMPUTE_RATIO:
 356                 return formula_ratio(he, pair, buf, size);
 357         case COMPUTE_WEIGHTED_DIFF:
 358                 return formula_wdiff(he, pair, buf, size);
 359         default:
 360                 BUG_ON(1);
 361         }
 362
 363         return -1;
 364 }
 365
 366 static void *block_hist_zalloc(size_t size)
 367 {
 368         struct block_hist *bh;
 369
 370         bh = zalloc(size + sizeof(*bh));
 371         if (!bh)
 372                 return NULL;
 373
 374         return &bh->he;
 375 }
 376
 377 static void block_hist_free(void *he)
 378 {
 379         struct block_hist *bh;
 380
 381         bh = container_of(he, struct block_hist, he);
 382         hists__delete_entries(&bh->block_hists);
 383         free(bh);
 384 }
 385
 386 struct hist_entry_ops block_hist_ops = {
 387         .new    = block_hist_zalloc,
 388         .free   = block_hist_free,
 389 };
 390
 391 static int diff__process_sample_event(struct perf_tool *tool,
 392                                       union perf_event *event,
 393                                       struct perf_sample *sample,
 394                                       struct evsel *evsel,
 395                                       struct machine *machine)
 396 {
 397         struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
 398         struct addr_location al;
 399         struct hists *hists = evsel__hists(evsel);
 400         struct hist_entry_iter iter = {
 401                 .evsel  = evsel,
 402                 .sample = sample,
 403                 .ops    = &hist_iter_normal,
 404         };
 405         int ret = -1;
 406
 407         if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
 408                                           sample->time)) {
 409                 return 0;
 410         }
 411
 412         if (machine__resolve(machine, &al, sample) < 0) {
 413                 pr_warning("problem processing %d event, skipping it.\n",
 414                            event->header.type);
 415                 return -1;
 416         }
 417
 418         if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
 419                 ret = 0;
 420                 goto out_put;
 421         }
 422
 423         switch (compute) {
 424         case COMPUTE_CYCLES:
 425                 if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
 426                                           NULL, NULL, sample, true)) {
 427                         pr_warning("problem incrementing symbol period, "
 428                                    "skipping event\n");
 429                         goto out_put;
 430                 }
 431
 432                 hist__account_cycles(sample->branch_stack, &al, sample, false,
 433                                      NULL);
 434                 break;
 435
 436         case COMPUTE_STREAM:
 437                 if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,
 438                                          NULL)) {
 439                         pr_debug("problem adding hist entry, skipping event\n");
 440                         goto out_put;
 441                 }
 442                 break;
 443
 444         default:
 445                 if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
 446                                       true)) {
 447                         pr_warning("problem incrementing symbol period, "
 448                                    "skipping event\n");
 449                         goto out_put;
 450                 }
 451         }
 452
 453         /*
 454          * The total_period is updated here before going to the output
 455          * tree since normally only the baseline hists will call
 456          * hists__output_resort() and precompute needs the total
 457          * period in order to sort entries by percentage delta.
 458          */
 459         hists->stats.total_period += sample->period;
 460         if (!al.filtered)
 461                 hists->stats.total_non_filtered_period += sample->period;
 462         ret = 0;
 463 out_put:
 464         addr_location__put(&al);
 465         return ret;
 466 }
 467
 468 static struct perf_diff pdiff = {
 469         .tool = {
 470                 .sample = diff__process_sample_event,
 471                 .mmap   = perf_event__process_mmap,
 472                 .mmap2  = perf_event__process_mmap2,
 473                 .comm   = perf_event__process_comm,
 474                 .exit   = perf_event__process_exit,
 475                 .fork   = perf_event__process_fork,
 476                 .lost   = perf_event__process_lost,
 477                 .namespaces = perf_event__process_namespaces,
 478                 .cgroup = perf_event__process_cgroup,
 479                 .ordered_events = true,
 480                 .ordering_requires_timestamps = true,
 481         },
 482 };
 483
 484 static struct evsel *evsel_match(struct evsel *evsel,
 485                                       struct evlist *evlist)
 486 {
 487         struct evsel *e;
 488
 489         evlist__for_each_entry(evlist, e) {
 490                 if (evsel__match2(evsel, e))
 491                         return e;
 492         }
 493
 494         return NULL;
 495 }
 496
 497 static void evlist__collapse_resort(struct evlist *evlist)
 498 {
 499         struct evsel *evsel;
 500
 501         evlist__for_each_entry(evlist, evsel) {
 502                 struct hists *hists = evsel__hists(evsel);
 503
 504                 hists__collapse_resort(hists, NULL);
 505         }
 506 }
 507
 508 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 509 {
 510         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 511         void *ptr = dfmt - dfmt->idx;
 512         struct data__file *d = container_of(ptr, struct data__file, fmt);
 513
 514         return d;
 515 }
 516
 517 static struct hist_entry*
 518 get_pair_data(struct hist_entry *he, struct data__file *d)
 519 {
 520         if (hist_entry__has_pairs(he)) {
 521                 struct hist_entry *pair;
 522
 523                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 524                         if (pair->hists == d->hists)
 525                                 return pair;
 526         }
 527
 528         return NULL;
 529 }
 530
 531 static struct hist_entry*
 532 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 533 {
 534         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 535
 536         return get_pair_data(he, d);
 537 }
 538
 539 static void hists__baseline_only(struct hists *hists)
 540 {
 541         struct rb_root_cached *root;
 542         struct rb_node *next;
 543
 544         if (hists__has(hists, need_collapse))
 545                 root = &hists->entries_collapsed;
 546         else
 547                 root = hists->entries_in;
 548
 549         next = rb_first_cached(root);
 550         while (next != NULL) {
 551                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 552
 553                 next = rb_next(&he->rb_node_in);
 554                 if (!hist_entry__next_pair(he)) {
 555                         rb_erase_cached(&he->rb_node_in, root);
 556                         hist_entry__delete(he);
 557                 }
 558         }
 559 }
 560
 561 static int64_t block_cycles_diff_cmp(struct hist_entry *left,
 562                                      struct hist_entry *right)
 563 {
 564         bool pairs_left  = hist_entry__has_pairs(left);
 565         bool pairs_right = hist_entry__has_pairs(right);
 566         s64 l, r;
 567
 568         if (!pairs_left && !pairs_right)
 569                 return 0;
 570
 571         l = llabs(left->diff.cycles);
 572         r = llabs(right->diff.cycles);
 573         return r - l;
 574 }
 575
 576 static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
 577                           struct hist_entry *left, struct hist_entry *right)
 578 {
 579         return block_cycles_diff_cmp(right, left);
 580 }
 581
 582 static void init_block_hist(struct block_hist *bh)
 583 {
 584         __hists__init(&bh->block_hists, &bh->block_list);
 585         perf_hpp_list__init(&bh->block_list);
 586
 587         INIT_LIST_HEAD(&bh->block_fmt.list);
 588         INIT_LIST_HEAD(&bh->block_fmt.sort_list);
 589         bh->block_fmt.cmp = block_info__cmp;
 590         bh->block_fmt.sort = block_sort;
 591         perf_hpp_list__register_sort_field(&bh->block_list,
 592                                            &bh->block_fmt);
 593         bh->valid = true;
 594 }
 595
 596 static struct hist_entry *get_block_pair(struct hist_entry *he,
 597                                          struct hists *hists_pair)
 598 {
 599         struct rb_root_cached *root = hists_pair->entries_in;
 600         struct rb_node *next = rb_first_cached(root);
 601         int64_t cmp;
 602
 603         while (next != NULL) {
 604                 struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
 605                                                       rb_node_in);
 606
 607                 next = rb_next(&he_pair->rb_node_in);
 608
 609                 cmp = __block_info__cmp(he_pair, he);
 610                 if (!cmp)
 611                         return he_pair;
 612         }
 613
 614         return NULL;
 615 }
 616
 617 static void init_spark_values(unsigned long *svals, int num)
 618 {
 619         for (int i = 0; i < num; i++)
 620                 svals[i] = 0;
 621 }
 622
 623 static void update_spark_value(unsigned long *svals, int num,
 624                                struct stats *stats, u64 val)
 625 {
 626         int n = stats->n;
 627
 628         if (n < num)
 629                 svals[n] = val;
 630 }
 631
 632 static void compute_cycles_diff(struct hist_entry *he,
 633                                 struct hist_entry *pair)
 634 {
 635         pair->diff.computed = true;
 636         if (pair->block_info->num && he->block_info->num) {
 637                 pair->diff.cycles =
 638                         pair->block_info->cycles_aggr / pair->block_info->num_aggr -
 639                         he->block_info->cycles_aggr / he->block_info->num_aggr;
 640
 641                 if (!cycles_hist)
 642                         return;
 643
 644                 init_stats(&pair->diff.stats);
 645                 init_spark_values(pair->diff.svals, NUM_SPARKS);
 646
 647                 for (int i = 0; i < pair->block_info->num; i++) {
 648                         u64 val;
 649
 650                         if (i >= he->block_info->num || i >= NUM_SPARKS)
 651                                 break;
 652
 653                         val = llabs(pair->block_info->cycles_spark[i] -
 654                                      he->block_info->cycles_spark[i]);
 655
 656                         update_spark_value(pair->diff.svals, NUM_SPARKS,
 657                                            &pair->diff.stats, val);
 658                         update_stats(&pair->diff.stats, val);
 659                 }
 660         }
 661 }
 662
 663 static void block_hists_match(struct hists *hists_base,
 664                               struct hists *hists_pair)
 665 {
 666         struct rb_root_cached *root = hists_base->entries_in;
 667         struct rb_node *next = rb_first_cached(root);
 668
 669         while (next != NULL) {
 670                 struct hist_entry *he = rb_entry(next, struct hist_entry,
 671                                                  rb_node_in);
 672                 struct hist_entry *pair = get_block_pair(he, hists_pair);
 673
 674                 next = rb_next(&he->rb_node_in);
 675
 676                 if (pair) {
 677                         hist_entry__add_pair(pair, he);
 678                         compute_cycles_diff(he, pair);
 679                 }
 680         }
 681 }
 682
 683 static void hists__precompute(struct hists *hists)
 684 {
 685         struct rb_root_cached *root;
 686         struct rb_node *next;
 687
 688         if (hists__has(hists, need_collapse))
 689                 root = &hists->entries_collapsed;
 690         else
 691                 root = hists->entries_in;
 692
 693         next = rb_first_cached(root);
 694         while (next != NULL) {
 695                 struct block_hist *bh, *pair_bh;
 696                 struct hist_entry *he, *pair;
 697                 struct data__file *d;
 698                 int i;
 699
 700                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 701                 next = rb_next(&he->rb_node_in);
 702
 703                 if (compute == COMPUTE_CYCLES) {
 704                         bh = container_of(he, struct block_hist, he);
 705                         init_block_hist(bh);
 706                         block_info__process_sym(he, bh, NULL, 0);
 707                 }
 708
 709                 data__for_each_file_new(i, d) {
 710                         pair = get_pair_data(he, d);
 711                         if (!pair)
 712                                 continue;
 713
 714                         switch (compute) {
 715                         case COMPUTE_DELTA:
 716                         case COMPUTE_DELTA_ABS:
 717                                 compute_delta(he, pair);
 718                                 break;
 719                         case COMPUTE_RATIO:
 720                                 compute_ratio(he, pair);
 721                                 break;
 722                         case COMPUTE_WEIGHTED_DIFF:
 723                                 compute_wdiff(he, pair);
 724                                 break;
 725                         case COMPUTE_CYCLES:
 726                                 pair_bh = container_of(pair, struct block_hist,
 727                                                        he);
 728                                 init_block_hist(pair_bh);
 729                                 block_info__process_sym(pair, pair_bh, NULL, 0);
 730
 731                                 bh = container_of(he, struct block_hist, he);
 732
 733                                 if (bh->valid && pair_bh->valid) {
 734                                         block_hists_match(&bh->block_hists,
 735                                                           &pair_bh->block_hists);
 736                                         hists__output_resort(&pair_bh->block_hists,
 737                                                              NULL);
 738                                 }
 739                                 break;
 740                         default:
 741                                 BUG_ON(1);
 742                         }
 743                 }
 744         }
 745 }
 746
 747 static int64_t cmp_doubles(double l, double r)
 748 {
 749         if (l > r)
 750                 return -1;
 751         else if (l < r)
 752                 return 1;
 753         else
 754                 return 0;
 755 }
 756
 757 static int64_t
 758 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 759                         int c)
 760 {
 761         switch (c) {
 762         case COMPUTE_DELTA:
 763         {
 764                 double l = left->diff.period_ratio_delta;
 765                 double r = right->diff.period_ratio_delta;
 766
 767                 return cmp_doubles(l, r);
 768         }
 769         case COMPUTE_DELTA_ABS:
 770         {
 771                 double l = fabs(left->diff.period_ratio_delta);
 772                 double r = fabs(right->diff.period_ratio_delta);
 773
 774                 return cmp_doubles(l, r);
 775         }
 776         case COMPUTE_RATIO:
 777         {
 778                 double l = left->diff.period_ratio;
 779                 double r = right->diff.period_ratio;
 780
 781                 return cmp_doubles(l, r);
 782         }
 783         case COMPUTE_WEIGHTED_DIFF:
 784         {
 785                 s64 l = left->diff.wdiff;
 786                 s64 r = right->diff.wdiff;
 787
 788                 return r - l;
 789         }
 790         default:
 791                 BUG_ON(1);
 792         }
 793
 794         return 0;
 795 }
 796
 797 static int64_t
 798 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 799                         int c, int sort_idx)
 800 {
 801         bool pairs_left  = hist_entry__has_pairs(left);
 802         bool pairs_right = hist_entry__has_pairs(right);
 803         struct hist_entry *p_right, *p_left;
 804
 805         if (!pairs_left && !pairs_right)
 806                 return 0;
 807
 808         if (!pairs_left || !pairs_right)
 809                 return pairs_left ? -1 : 1;
 810
 811         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 812         p_right = get_pair_data(right, &data__files[sort_idx]);
 813
 814         if (!p_left && !p_right)
 815                 return 0;
 816
 817         if (!p_left || !p_right)
 818                 return p_left ? -1 : 1;
 819
 820         /*
 821          * We have 2 entries of same kind, let's
 822          * make the data comparison.
 823          */
 824         return __hist_entry__cmp_compute(p_left, p_right, c);
 825 }
 826
 827 static int64_t
 828 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 829                             int c, int sort_idx)
 830 {
 831         struct hist_entry *p_right, *p_left;
 832
 833         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 834         p_right = get_pair_data(right, &data__files[sort_idx]);
 835
 836         if (!p_left && !p_right)
 837                 return 0;
 838
 839         if (!p_left || !p_right)
 840                 return p_left ? -1 : 1;
 841
 842         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 843                 /*
 844                  * The delta can be computed without the baseline, but
 845                  * others are not.  Put those entries which have no
 846                  * values below.
 847                  */
 848                 if (left->dummy && right->dummy)
 849                         return 0;
 850
 851                 if (left->dummy || right->dummy)
 852                         return left->dummy ? 1 : -1;
 853         }
 854
 855         return __hist_entry__cmp_compute(p_left, p_right, c);
 856 }
 857
 858 static int64_t
 859 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 860                     struct hist_entry *left __maybe_unused,
 861                     struct hist_entry *right __maybe_unused)
 862 {
 863         return 0;
 864 }
 865
 866 static int64_t
 867 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 868                          struct hist_entry *left, struct hist_entry *right)
 869 {
 870         if (left->stat.period == right->stat.period)
 871                 return 0;
 872         return left->stat.period > right->stat.period ? 1 : -1;
 873 }
 874
 875 static int64_t
 876 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 877                       struct hist_entry *left, struct hist_entry *right)
 878 {
 879         struct data__file *d = fmt_to_data_file(fmt);
 880
 881         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 882 }
 883
 884 static int64_t
 885 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
 886                       struct hist_entry *left, struct hist_entry *right)
 887 {
 888         struct data__file *d = fmt_to_data_file(fmt);
 889
 890         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
 891 }
 892
 893 static int64_t
 894 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 895                       struct hist_entry *left, struct hist_entry *right)
 896 {
 897         struct data__file *d = fmt_to_data_file(fmt);
 898
 899         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 900 }
 901
 902 static int64_t
 903 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 904                       struct hist_entry *left, struct hist_entry *right)
 905 {
 906         struct data__file *d = fmt_to_data_file(fmt);
 907
 908         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 909 }
 910
 911 static int64_t
 912 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 913                           struct hist_entry *left, struct hist_entry *right)
 914 {
 915         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 916                                            sort_compute);
 917 }
 918
 919 static int64_t
 920 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 921                               struct hist_entry *left, struct hist_entry *right)
 922 {
 923         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 924                                            sort_compute);
 925 }
 926
 927 static int64_t
 928 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 929                           struct hist_entry *left, struct hist_entry *right)
 930 {
 931         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 932                                            sort_compute);
 933 }
 934
 935 static int64_t
 936 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 937                           struct hist_entry *left, struct hist_entry *right)
 938 {
 939         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 940                                            sort_compute);
 941 }
 942
 943 static void hists__process(struct hists *hists)
 944 {
 945         if (show_baseline_only)
 946                 hists__baseline_only(hists);
 947
 948         hists__precompute(hists);
 949         hists__output_resort(hists, NULL);
 950
 951         if (compute == COMPUTE_CYCLES)
 952                 symbol_conf.report_block = true;
 953
 954         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 955                        !symbol_conf.use_callchain);
 956 }
 957
 958 static void data__fprintf(void)
 959 {
 960         struct data__file *d;
 961         int i;
 962
 963         fprintf(stdout, "# Data files:\n");
 964
 965         data__for_each_file(i, d)
 966                 fprintf(stdout, "#  [%d] %s %s\n",
 967                         d->idx, d->data.path,
 968                         !d->idx ? "(Baseline)" : "");
 969
 970         fprintf(stdout, "#\n");
 971 }
 972
 973 static void data_process(void)
 974 {
 975         struct evlist *evlist_base = data__files[0].session->evlist;
 976         struct evsel *evsel_base;
 977         bool first = true;
 978
 979         evlist__for_each_entry(evlist_base, evsel_base) {
 980                 struct hists *hists_base = evsel__hists(evsel_base);
 981                 struct data__file *d;
 982                 int i;
 983
 984                 data__for_each_file_new(i, d) {
 985                         struct evlist *evlist = d->session->evlist;
 986                         struct evsel *evsel;
 987                         struct hists *hists;
 988
 989                         evsel = evsel_match(evsel_base, evlist);
 990                         if (!evsel)
 991                                 continue;
 992
 993                         hists = evsel__hists(evsel);
 994                         d->hists = hists;
 995
 996                         hists__match(hists_base, hists);
 997
 998                         if (!show_baseline_only)
 999                                 hists__link(hists_base, hists);
1000                 }
1001
1002                 if (!quiet) {
1003                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
1004                                 evsel__name(evsel_base));
1005                 }
1006
1007                 first = false;
1008
1009                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
1010                         data__fprintf();
1011
1012                 /* Don't sort callchain for perf diff */
1013                 evsel__reset_sample_bit(evsel_base, CALLCHAIN);
1014
1015                 hists__process(hists_base);
1016         }
1017 }
1018
1019 static int process_base_stream(struct data__file *data_base,
1020                                struct data__file *data_pair,
1021                                const char *title __maybe_unused)
1022 {
1023         struct evlist *evlist_base = data_base->session->evlist;
1024         struct evlist *evlist_pair = data_pair->session->evlist;
1025         struct evsel *evsel_base, *evsel_pair;
1026         struct evsel_streams *es_base, *es_pair;
1027
1028         evlist__for_each_entry(evlist_base, evsel_base) {
1029                 evsel_pair = evsel_match(evsel_base, evlist_pair);
1030                 if (!evsel_pair)
1031                         continue;
1032
1033                 es_base = evsel_streams__entry(data_base->evlist_streams,
1034                                                evsel_base->idx);
1035                 if (!es_base)
1036                         return -1;
1037
1038                 es_pair = evsel_streams__entry(data_pair->evlist_streams,
1039                                                evsel_pair->idx);
1040                 if (!es_pair)
1041                         return -1;
1042
1043                 evsel_streams__match(es_base, es_pair);
1044                 evsel_streams__report(es_base, es_pair);
1045         }
1046
1047         return 0;
1048 }
1049
1050 static void stream_process(void)
1051 {
1052         /*
1053          * Stream comparison only supports two data files.
1054          * perf.data.old and perf.data. data__files[0] is perf.data.old,
1055          * data__files[1] is perf.data.
1056          */
1057         process_base_stream(&data__files[0], &data__files[1],
1058                             "# Output based on old perf data:\n#\n");
1059 }
1060
1061 static void data__free(struct data__file *d)
1062 {
1063         int col;
1064
1065         if (d->evlist_streams)
1066                 evlist_streams__delete(d->evlist_streams);
1067
1068         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1069                 struct diff_hpp_fmt *fmt = &d->fmt[col];
1070
1071                 zfree(&fmt->header);
1072         }
1073 }
1074
1075 static int abstime_str_dup(char **pstr)
1076 {
1077         char *str = NULL;
1078
1079         if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1080                 str = strdup(pdiff.time_str);
1081                 if (!str)
1082                         return -ENOMEM;
1083         }
1084
1085         *pstr = str;
1086         return 0;
1087 }
1088
1089 static int parse_absolute_time(struct data__file *d, char **pstr)
1090 {
1091         char *p = *pstr;
1092         int ret;
1093
1094         /*
1095          * Absolute timestamp for one file has the format: a.b,c.d
1096          * For multiple files, the format is: a.b,c.d:a.b,c.d
1097          */
1098         p = strchr(*pstr, ':');
1099         if (p) {
1100                 if (p == *pstr) {
1101                         pr_err("Invalid time string\n");
1102                         return -EINVAL;
1103                 }
1104
1105                 *p = 0;
1106                 p++;
1107                 if (*p == 0) {
1108                         pr_err("Invalid time string\n");
1109                         return -EINVAL;
1110                 }
1111         }
1112
1113         ret = perf_time__parse_for_ranges(*pstr, d->session,
1114                                           &pdiff.ptime_range,
1115                                           &pdiff.range_size,
1116                                           &pdiff.range_num);
1117         if (ret < 0)
1118                 return ret;
1119
1120         if (!p || *p == 0)
1121                 *pstr = NULL;
1122         else
1123                 *pstr = p;
1124
1125         return ret;
1126 }
1127
1128 static int parse_percent_time(struct data__file *d)
1129 {
1130         int ret;
1131
1132         ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1133                                           &pdiff.ptime_range,
1134                                           &pdiff.range_size,
1135                                           &pdiff.range_num);
1136         return ret;
1137 }
1138
1139 static int parse_time_str(struct data__file *d, char *abstime_ostr,
1140                            char **pabstime_tmp)
1141 {
1142         int ret = 0;
1143
1144         if (abstime_ostr)
1145                 ret = parse_absolute_time(d, pabstime_tmp);
1146         else if (pdiff.time_str)
1147                 ret = parse_percent_time(d);
1148
1149         return ret;
1150 }
1151
1152 static int check_file_brstack(void)
1153 {
1154         struct data__file *d;
1155         bool has_br_stack;
1156         int i;
1157
1158         data__for_each_file(i, d) {
1159                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1160                 if (IS_ERR(d->session)) {
1161                         pr_err("Failed to open %s\n", d->data.path);
1162                         return PTR_ERR(d->session);
1163                 }
1164
1165                 has_br_stack = perf_header__has_feat(&d->session->header,
1166                                                      HEADER_BRANCH_STACK);
1167                 perf_session__delete(d->session);
1168                 if (!has_br_stack)
1169                         return 0;
1170         }
1171
1172         /* Set only all files having branch stacks */
1173         pdiff.has_br_stack = true;
1174         return 0;
1175 }
1176
1177 static int __cmd_diff(void)
1178 {
1179         struct data__file *d;
1180         int ret, i;
1181         char *abstime_ostr, *abstime_tmp;
1182
1183         ret = abstime_str_dup(&abstime_ostr);
1184         if (ret)
1185                 return ret;
1186
1187         abstime_tmp = abstime_ostr;
1188         ret = -EINVAL;
1189
1190         data__for_each_file(i, d) {
1191                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1192                 if (IS_ERR(d->session)) {
1193                         ret = PTR_ERR(d->session);
1194                         pr_err("Failed to open %s\n", d->data.path);
1195                         goto out_delete;
1196                 }
1197
1198                 if (pdiff.time_str) {
1199                         ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1200                         if (ret < 0)
1201                                 goto out_delete;
1202                 }
1203
1204                 if (cpu_list) {
1205                         ret = perf_session__cpu_bitmap(d->session, cpu_list,
1206                                                        cpu_bitmap);
1207                         if (ret < 0)
1208                                 goto out_delete;
1209                 }
1210
1211                 ret = perf_session__process_events(d->session);
1212                 if (ret) {
1213                         pr_err("Failed to process %s\n", d->data.path);
1214                         goto out_delete;
1215                 }
1216
1217                 evlist__collapse_resort(d->session->evlist);
1218
1219                 if (pdiff.ptime_range)
1220                         zfree(&pdiff.ptime_range);
1221
1222                 if (compute == COMPUTE_STREAM) {
1223                         d->evlist_streams = evlist__create_streams(
1224                                                 d->session->evlist, 5);
1225                         if (!d->evlist_streams) {
1226                                 ret = -ENOMEM;
1227                                 goto out_delete;
1228                         }
1229                 }
1230         }
1231
1232         if (compute == COMPUTE_STREAM)
1233                 stream_process();
1234         else
1235                 data_process();
1236
1237  out_delete:
1238         data__for_each_file(i, d) {
1239                 perf_session__delete(d->session);
1240                 data__free(d);
1241         }
1242
1243         free(data__files);
1244
1245         if (pdiff.ptime_range)
1246                 zfree(&pdiff.ptime_range);
1247
1248         if (abstime_ostr)
1249                 free(abstime_ostr);
1250
1251         return ret;
1252 }
1253
1254 static const char * const diff_usage[] = {
1255         "perf diff [<options>] [old_file] [new_file]",
1256         NULL,
1257 };
1258
1259 static const struct option options[] = {
1260         OPT_INCR('v', "verbose", &verbose,
1261                     "be more verbose (show symbol address, etc)"),
1262         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1263         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1264                     "Show only items with match in baseline"),
1265         OPT_CALLBACK('c', "compute", &compute,
1266                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1267                      "Entries differential computation selection",
1268                      setup_compute),
1269         OPT_BOOLEAN('p', "period", &show_period,
1270                     "Show period values."),
1271         OPT_BOOLEAN('F', "formula", &show_formula,
1272                     "Show formula."),
1273         OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1274                     "Show cycles histogram and standard deviation "
1275                     "- WARNING: use only with -c cycles."),
1276         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1277                     "dump raw trace in ASCII"),
1278         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1279         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1280                    "file", "kallsyms pathname"),
1281         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1282                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
1283         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1284                    "only consider symbols in these dsos"),
1285         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1286                    "only consider symbols in these comms"),
1287         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1288                    "only consider these symbols"),
1289         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1290                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1291                    " Please refer the man page for the complete list."),
1292         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1293                    "separator for columns, no spaces will be added between "
1294                    "columns '.' is reserved."),
1295         OPT_CALLBACK(0, "symfs", NULL, "directory",
1296                      "Look for files with symbols relative to this directory",
1297                      symbol__config_symfs),
1298         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1299         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1300                      "How to display percentage of filtered entries", parse_filter_percentage),
1301         OPT_STRING(0, "time", &pdiff.time_str, "str",
1302                    "Time span (time percent or absolute timestamp)"),
1303         OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1304         OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1305                    "only consider symbols in these pids"),
1306         OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1307                    "only consider symbols in these tids"),
1308         OPT_BOOLEAN(0, "stream", &pdiff.stream,
1309                     "Enable hot streams comparison."),
1310         OPT_END()
1311 };
1312
1313 static double baseline_percent(struct hist_entry *he)
1314 {
1315         u64 total = hists__total_period(he->hists);
1316
1317         return 100.0 * he->stat.period / total;
1318 }
1319
1320 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1321                                struct perf_hpp *hpp, struct hist_entry *he)
1322 {
1323         struct diff_hpp_fmt *dfmt =
1324                 container_of(fmt, struct diff_hpp_fmt, fmt);
1325         double percent = baseline_percent(he);
1326         char pfmt[20] = " ";
1327
1328         if (!he->dummy) {
1329                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1330                 return percent_color_snprintf(hpp->buf, hpp->size,
1331                                               pfmt, percent);
1332         } else
1333                 return scnprintf(hpp->buf, hpp->size, "%*s",
1334                                  dfmt->header_width, pfmt);
1335 }
1336
1337 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1338 {
1339         double percent = baseline_percent(he);
1340         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1341         int ret = 0;
1342
1343         if (!he->dummy)
1344                 ret = scnprintf(buf, size, fmt, percent);
1345
1346         return ret;
1347 }
1348
1349 static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1350                          struct perf_hpp *hpp, int width)
1351 {
1352         struct block_hist *bh = container_of(he, struct block_hist, he);
1353         struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1354         struct hist_entry *block_he;
1355         struct block_info *bi;
1356         char buf[128];
1357         char *start_line, *end_line;
1358
1359         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1360         if (!block_he) {
1361                 hpp->skip = true;
1362                 return 0;
1363         }
1364
1365         /*
1366          * Avoid printing the warning "addr2line_init failed for ..."
1367          */
1368         symbol_conf.disable_add2line_warn = true;
1369
1370         bi = block_he->block_info;
1371
1372         start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1373                                   he->ms.sym);
1374
1375         end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1376                                 he->ms.sym);
1377
1378         if ((strncmp(start_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0) &&
1379             (strncmp(end_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)) {
1380                 scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1381                           start_line, end_line, block_he->diff.cycles);
1382         } else {
1383                 scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1384                           bi->start, bi->end, block_he->diff.cycles);
1385         }
1386
1387         free_srcline(start_line);
1388         free_srcline(end_line);
1389
1390         return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1391 }
1392
1393 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1394                                 struct perf_hpp *hpp, struct hist_entry *he,
1395                                 int comparison_method)
1396 {
1397         struct diff_hpp_fmt *dfmt =
1398                 container_of(fmt, struct diff_hpp_fmt, fmt);
1399         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1400         double diff;
1401         s64 wdiff;
1402         char pfmt[20] = " ";
1403
1404         if (!pair) {
1405                 if (comparison_method == COMPUTE_CYCLES) {
1406                         struct block_hist *bh;
1407
1408                         bh = container_of(he, struct block_hist, he);
1409                         if (bh->block_idx)
1410                                 hpp->skip = true;
1411                 }
1412
1413                 goto no_print;
1414         }
1415
1416         switch (comparison_method) {
1417         case COMPUTE_DELTA:
1418                 if (pair->diff.computed)
1419                         diff = pair->diff.period_ratio_delta;
1420                 else
1421                         diff = compute_delta(he, pair);
1422
1423                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1424                 return percent_color_snprintf(hpp->buf, hpp->size,
1425                                         pfmt, diff);
1426         case COMPUTE_RATIO:
1427                 if (he->dummy)
1428                         goto dummy_print;
1429                 if (pair->diff.computed)
1430                         diff = pair->diff.period_ratio;
1431                 else
1432                         diff = compute_ratio(he, pair);
1433
1434                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1435                 return value_color_snprintf(hpp->buf, hpp->size,
1436                                         pfmt, diff);
1437         case COMPUTE_WEIGHTED_DIFF:
1438                 if (he->dummy)
1439                         goto dummy_print;
1440                 if (pair->diff.computed)
1441                         wdiff = pair->diff.wdiff;
1442                 else
1443                         wdiff = compute_wdiff(he, pair);
1444
1445                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1446                 return color_snprintf(hpp->buf, hpp->size,
1447                                 get_percent_color(wdiff),
1448                                 pfmt, wdiff);
1449         case COMPUTE_CYCLES:
1450                 return cycles_printf(he, pair, hpp, dfmt->header_width);
1451         default:
1452                 BUG_ON(1);
1453         }
1454 dummy_print:
1455         return scnprintf(hpp->buf, hpp->size, "%*s",
1456                         dfmt->header_width, "N/A");
1457 no_print:
1458         return scnprintf(hpp->buf, hpp->size, "%*s",
1459                         dfmt->header_width, pfmt);
1460 }
1461
1462 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1463                         struct perf_hpp *hpp, struct hist_entry *he)
1464 {
1465         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1466 }
1467
1468 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1469                         struct perf_hpp *hpp, struct hist_entry *he)
1470 {
1471         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1472 }
1473
1474 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1475                         struct perf_hpp *hpp, struct hist_entry *he)
1476 {
1477         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1478 }
1479
1480 static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1481                              struct perf_hpp *hpp, struct hist_entry *he)
1482 {
1483         return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1484 }
1485
1486 static int all_zero(unsigned long *vals, int len)
1487 {
1488         int i;
1489
1490         for (i = 0; i < len; i++)
1491                 if (vals[i] != 0)
1492                         return 0;
1493         return 1;
1494 }
1495
1496 static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1497 {
1498         int printed;
1499
1500         if (n <= 1)
1501                 return 0;
1502
1503         if (n > NUM_SPARKS)
1504                 n = NUM_SPARKS;
1505         if (all_zero(svals, n))
1506                 return 0;
1507
1508         printed = print_spark(bf, size, svals, n);
1509         printed += scnprintf(bf + printed, size - printed, " ");
1510         return printed;
1511 }
1512
1513 static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1514                             struct perf_hpp *hpp, struct hist_entry *he)
1515 {
1516         struct diff_hpp_fmt *dfmt =
1517                 container_of(fmt, struct diff_hpp_fmt, fmt);
1518         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1519         struct block_hist *bh = container_of(he, struct block_hist, he);
1520         struct block_hist *bh_pair;
1521         struct hist_entry *block_he;
1522         char spark[32], buf[128];
1523         double r;
1524         int ret, pad;
1525
1526         if (!pair) {
1527                 if (bh->block_idx)
1528                         hpp->skip = true;
1529
1530                 goto no_print;
1531         }
1532
1533         bh_pair = container_of(pair, struct block_hist, he);
1534
1535         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1536         if (!block_he) {
1537                 hpp->skip = true;
1538                 goto no_print;
1539         }
1540
1541         ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1542                                  block_he->diff.stats.n);
1543
1544         r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1545                              avg_stats(&block_he->diff.stats));
1546
1547         if (ret) {
1548                 /*
1549                  * Padding spaces if number of sparks less than NUM_SPARKS
1550                  * otherwise the output is not aligned.
1551                  */
1552                 pad = NUM_SPARKS - ((ret - 1) / 3);
1553                 scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1554                 ret = scnprintf(hpp->buf, hpp->size, "%*s",
1555                                 dfmt->header_width, buf);
1556
1557                 if (pad) {
1558                         ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1559                                          "%-*s", pad, " ");
1560                 }
1561
1562                 return ret;
1563         }
1564
1565 no_print:
1566         return scnprintf(hpp->buf, hpp->size, "%*s",
1567                         dfmt->header_width, " ");
1568 }
1569
1570 static void
1571 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1572 {
1573         switch (idx) {
1574         case PERF_HPP_DIFF__PERIOD_BASELINE:
1575                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
1576                 break;
1577
1578         default:
1579                 break;
1580         }
1581 }
1582
1583 static void
1584 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1585                 int idx, char *buf, size_t size)
1586 {
1587         double diff;
1588         double ratio;
1589         s64 wdiff;
1590
1591         switch (idx) {
1592         case PERF_HPP_DIFF__DELTA:
1593         case PERF_HPP_DIFF__DELTA_ABS:
1594                 if (pair->diff.computed)
1595                         diff = pair->diff.period_ratio_delta;
1596                 else
1597                         diff = compute_delta(he, pair);
1598
1599                 scnprintf(buf, size, "%+4.2F%%", diff);
1600                 break;
1601
1602         case PERF_HPP_DIFF__RATIO:
1603                 /* No point for ratio number if we are dummy.. */
1604                 if (he->dummy) {
1605                         scnprintf(buf, size, "N/A");
1606                         break;
1607                 }
1608
1609                 if (pair->diff.computed)
1610                         ratio = pair->diff.period_ratio;
1611                 else
1612                         ratio = compute_ratio(he, pair);
1613
1614                 if (ratio > 0.0)
1615                         scnprintf(buf, size, "%14.6F", ratio);
1616                 break;
1617
1618         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1619                 /* No point for wdiff number if we are dummy.. */
1620                 if (he->dummy) {
1621                         scnprintf(buf, size, "N/A");
1622                         break;
1623                 }
1624
1625                 if (pair->diff.computed)
1626                         wdiff = pair->diff.wdiff;
1627                 else
1628                         wdiff = compute_wdiff(he, pair);
1629
1630                 if (wdiff != 0)
1631                         scnprintf(buf, size, "%14ld", wdiff);
1632                 break;
1633
1634         case PERF_HPP_DIFF__FORMULA:
1635                 formula_fprintf(he, pair, buf, size);
1636                 break;
1637
1638         case PERF_HPP_DIFF__PERIOD:
1639                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1640                 break;
1641
1642         default:
1643                 BUG_ON(1);
1644         }
1645 }
1646
1647 static void
1648 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1649                     char *buf, size_t size)
1650 {
1651         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1652         int idx = dfmt->idx;
1653
1654         /* baseline is special */
1655         if (idx == PERF_HPP_DIFF__BASELINE)
1656                 hpp__entry_baseline(he, buf, size);
1657         else {
1658                 if (pair)
1659                         hpp__entry_pair(he, pair, idx, buf, size);
1660                 else
1661                         hpp__entry_unpair(he, idx, buf, size);
1662         }
1663 }
1664
1665 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1666                              struct hist_entry *he)
1667 {
1668         struct diff_hpp_fmt *dfmt =
1669                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1670         char buf[MAX_COL_WIDTH] = " ";
1671
1672         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1673
1674         if (symbol_conf.field_sep)
1675                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1676         else
1677                 return scnprintf(hpp->buf, hpp->size, "%*s",
1678                                  dfmt->header_width, buf);
1679 }
1680
1681 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1682                        struct hists *hists __maybe_unused,
1683                        int line __maybe_unused,
1684                        int *span __maybe_unused)
1685 {
1686         struct diff_hpp_fmt *dfmt =
1687                 container_of(fmt, struct diff_hpp_fmt, fmt);
1688
1689         BUG_ON(!dfmt->header);
1690         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1691 }
1692
1693 static int hpp__width(struct perf_hpp_fmt *fmt,
1694                       struct perf_hpp *hpp __maybe_unused,
1695                       struct hists *hists __maybe_unused)
1696 {
1697         struct diff_hpp_fmt *dfmt =
1698                 container_of(fmt, struct diff_hpp_fmt, fmt);
1699
1700         BUG_ON(dfmt->header_width <= 0);
1701         return dfmt->header_width;
1702 }
1703
1704 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1705 {
1706 #define MAX_HEADER_NAME 100
1707         char buf_indent[MAX_HEADER_NAME];
1708         char buf[MAX_HEADER_NAME];
1709         const char *header = NULL;
1710         int width = 0;
1711
1712         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1713         header = columns[dfmt->idx].name;
1714         width  = columns[dfmt->idx].width;
1715
1716         /* Only our defined HPP fmts should appear here. */
1717         BUG_ON(!header);
1718
1719         if (data__files_cnt > 2)
1720                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1721
1722 #define NAME (data__files_cnt > 2 ? buf : header)
1723         dfmt->header_width = width;
1724         width = (int) strlen(NAME);
1725         if (dfmt->header_width < width)
1726                 dfmt->header_width = width;
1727
1728         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1729                   dfmt->header_width, NAME);
1730
1731         dfmt->header = strdup(buf_indent);
1732 #undef MAX_HEADER_NAME
1733 #undef NAME
1734 }
1735
1736 static void data__hpp_register(struct data__file *d, int idx)
1737 {
1738         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1739         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1740
1741         dfmt->idx = idx;
1742
1743         fmt->header = hpp__header;
1744         fmt->width  = hpp__width;
1745         fmt->entry  = hpp__entry_global;
1746         fmt->cmp    = hist_entry__cmp_nop;
1747         fmt->collapse = hist_entry__cmp_nop;
1748
1749         /* TODO more colors */
1750         switch (idx) {
1751         case PERF_HPP_DIFF__BASELINE:
1752                 fmt->color = hpp__color_baseline;
1753                 fmt->sort  = hist_entry__cmp_baseline;
1754                 break;
1755         case PERF_HPP_DIFF__DELTA:
1756                 fmt->color = hpp__color_delta;
1757                 fmt->sort  = hist_entry__cmp_delta;
1758                 break;
1759         case PERF_HPP_DIFF__RATIO:
1760                 fmt->color = hpp__color_ratio;
1761                 fmt->sort  = hist_entry__cmp_ratio;
1762                 break;
1763         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1764                 fmt->color = hpp__color_wdiff;
1765                 fmt->sort  = hist_entry__cmp_wdiff;
1766                 break;
1767         case PERF_HPP_DIFF__DELTA_ABS:
1768                 fmt->color = hpp__color_delta;
1769                 fmt->sort  = hist_entry__cmp_delta_abs;
1770                 break;
1771         case PERF_HPP_DIFF__CYCLES:
1772                 fmt->color = hpp__color_cycles;
1773                 fmt->sort  = hist_entry__cmp_nop;
1774                 break;
1775         case PERF_HPP_DIFF__CYCLES_HIST:
1776                 fmt->color = hpp__color_cycles_hist;
1777                 fmt->sort  = hist_entry__cmp_nop;
1778                 break;
1779         default:
1780                 fmt->sort  = hist_entry__cmp_nop;
1781                 break;
1782         }
1783
1784         init_header(d, dfmt);
1785         perf_hpp__column_register(fmt);
1786         perf_hpp__register_sort_field(fmt);
1787 }
1788
1789 static int ui_init(void)
1790 {
1791         struct data__file *d;
1792         struct perf_hpp_fmt *fmt;
1793         int i;
1794
1795         data__for_each_file(i, d) {
1796
1797                 /*
1798                  * Baseline or compute realted columns:
1799                  *
1800                  *   PERF_HPP_DIFF__BASELINE
1801                  *   PERF_HPP_DIFF__DELTA
1802                  *   PERF_HPP_DIFF__RATIO
1803                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1804                  *   PERF_HPP_DIFF__CYCLES
1805                  */
1806                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1807                                           PERF_HPP_DIFF__BASELINE);
1808
1809                 if (cycles_hist && i)
1810                         data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1811
1812                 /*
1813                  * And the rest:
1814                  *
1815                  * PERF_HPP_DIFF__FORMULA
1816                  * PERF_HPP_DIFF__PERIOD
1817                  * PERF_HPP_DIFF__PERIOD_BASELINE
1818                  */
1819                 if (show_formula && i)
1820                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1821
1822                 if (show_period)
1823                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1824                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1825         }
1826
1827         if (!sort_compute)
1828                 return 0;
1829
1830         /*
1831          * Prepend an fmt to sort on columns at 'sort_compute' first.
1832          * This fmt is added only to the sort list but not to the
1833          * output fields list.
1834          *
1835          * Note that this column (data) can be compared twice - one
1836          * for this 'sort_compute' fmt and another for the normal
1837          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1838          * will be sorted out by first try or baseline and comparing
1839          * is not a costly operation.
1840          */
1841         fmt = zalloc(sizeof(*fmt));
1842         if (fmt == NULL) {
1843                 pr_err("Memory allocation failed\n");
1844                 return -1;
1845         }
1846
1847         fmt->cmp      = hist_entry__cmp_nop;
1848         fmt->collapse = hist_entry__cmp_nop;
1849
1850         switch (compute) {
1851         case COMPUTE_DELTA:
1852                 fmt->sort = hist_entry__cmp_delta_idx;
1853                 break;
1854         case COMPUTE_RATIO:
1855                 fmt->sort = hist_entry__cmp_ratio_idx;
1856                 break;
1857         case COMPUTE_WEIGHTED_DIFF:
1858                 fmt->sort = hist_entry__cmp_wdiff_idx;
1859                 break;
1860         case COMPUTE_DELTA_ABS:
1861                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1862                 break;
1863         case COMPUTE_CYCLES:
1864                 /*
1865                  * Should set since 'fmt->sort' is called without
1866                  * checking valid during sorting
1867                  */
1868                 fmt->sort = hist_entry__cmp_nop;
1869                 break;
1870         default:
1871                 BUG_ON(1);
1872         }
1873
1874         perf_hpp__prepend_sort_field(fmt);
1875         return 0;
1876 }
1877
1878 static int data_init(int argc, const char **argv)
1879 {
1880         struct data__file *d;
1881         static const char *defaults[] = {
1882                 "perf.data.old",
1883                 "perf.data",
1884         };
1885         bool use_default = true;
1886         int i;
1887
1888         data__files_cnt = 2;
1889
1890         if (argc) {
1891                 if (argc == 1)
1892                         defaults[1] = argv[0];
1893                 else {
1894                         data__files_cnt = argc;
1895                         use_default = false;
1896                 }
1897         } else if (perf_guest) {
1898                 defaults[0] = "perf.data.host";
1899                 defaults[1] = "perf.data.guest";
1900         }
1901
1902         if (sort_compute >= (unsigned int) data__files_cnt) {
1903                 pr_err("Order option out of limit.\n");
1904                 return -EINVAL;
1905         }
1906
1907         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1908         if (!data__files)
1909                 return -ENOMEM;
1910
1911         data__for_each_file(i, d) {
1912                 struct perf_data *data = &d->data;
1913
1914                 data->path  = use_default ? defaults[i] : argv[i];
1915                 data->mode  = PERF_DATA_MODE_READ,
1916                 data->force = force,
1917
1918                 d->idx  = i;
1919         }
1920
1921         return 0;
1922 }
1923
1924 static int diff__config(const char *var, const char *value,
1925                         void *cb __maybe_unused)
1926 {
1927         if (!strcmp(var, "diff.order")) {
1928                 int ret;
1929                 if (perf_config_int(&ret, var, value) < 0)
1930                         return -1;
1931                 sort_compute = ret;
1932                 return 0;
1933         }
1934         if (!strcmp(var, "diff.compute")) {
1935                 if (!strcmp(value, "delta")) {
1936                         compute = COMPUTE_DELTA;
1937                 } else if (!strcmp(value, "delta-abs")) {
1938                         compute = COMPUTE_DELTA_ABS;
1939                 } else if (!strcmp(value, "ratio")) {
1940                         compute = COMPUTE_RATIO;
1941                 } else if (!strcmp(value, "wdiff")) {
1942                         compute = COMPUTE_WEIGHTED_DIFF;
1943                 } else {
1944                         pr_err("Invalid compute method: %s\n", value);
1945                         return -1;
1946                 }
1947         }
1948
1949         return 0;
1950 }
1951
1952 int cmd_diff(int argc, const char **argv)
1953 {
1954         int ret = hists__init();
1955
1956         if (ret < 0)
1957                 return ret;
1958
1959         perf_config(diff__config, NULL);
1960
1961         argc = parse_options(argc, argv, options, diff_usage, 0);
1962
1963         if (quiet)
1964                 perf_quiet_option();
1965
1966         if (cycles_hist && (compute != COMPUTE_CYCLES))
1967                 usage_with_options(diff_usage, options);
1968
1969         if (pdiff.stream)
1970                 compute = COMPUTE_STREAM;
1971
1972         symbol__annotation_init();
1973
1974         if (symbol__init(NULL) < 0)
1975                 return -1;
1976
1977         if (data_init(argc, argv) < 0)
1978                 return -1;
1979
1980         if (check_file_brstack() < 0)
1981                 return -1;
1982
1983         if ((compute == COMPUTE_CYCLES || compute == COMPUTE_STREAM)
1984             && !pdiff.has_br_stack) {
1985                 return -1;
1986         }
1987
1988         if (compute == COMPUTE_STREAM) {
1989                 symbol_conf.show_branchflag_count = true;
1990                 symbol_conf.disable_add2line_warn = true;
1991                 callchain_param.mode = CHAIN_FLAT;
1992                 callchain_param.key = CCKEY_SRCLINE;
1993                 callchain_param.branch_callstack = 1;
1994                 symbol_conf.use_callchain = true;
1995                 callchain_register_param(&callchain_param);
1996                 sort_order = "srcline,symbol,dso";
1997         } else {
1998                 if (ui_init() < 0)
1999                         return -1;
2000
2001                 sort__mode = SORT_MODE__DIFF;
2002         }
2003
2004         if (setup_sorting(NULL) < 0)
2005                 usage_with_options(diff_usage, options);
2006
2007         setup_pager();
2008
2009         sort__setup_elide(NULL);
2010
2011         return __cmd_diff();
2012 }