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 <linux/err.h>
  29 #include <linux/zalloc.h>
  30 #include <subcmd/pager.h>
  31 #include <subcmd/parse-options.h>
  32
  33 #include <errno.h>
  34 #include <inttypes.h>
  35 #include <stdlib.h>
  36 #include <math.h>
  37
  38 struct perf_diff {
  39         struct perf_tool                 tool;
  40         const char                      *time_str;
  41         struct perf_time_interval       *ptime_range;
  42         int                              range_size;
  43         int                              range_num;
  44         bool                             has_br_stack;
  45 };
  46
  47 /* Diff command specific HPP columns. */
  48 enum {
  49         PERF_HPP_DIFF__BASELINE,
  50         PERF_HPP_DIFF__PERIOD,
  51         PERF_HPP_DIFF__PERIOD_BASELINE,
  52         PERF_HPP_DIFF__DELTA,
  53         PERF_HPP_DIFF__RATIO,
  54         PERF_HPP_DIFF__WEIGHTED_DIFF,
  55         PERF_HPP_DIFF__FORMULA,
  56         PERF_HPP_DIFF__DELTA_ABS,
  57         PERF_HPP_DIFF__CYCLES,
  58         PERF_HPP_DIFF__CYCLES_HIST,
  59
  60         PERF_HPP_DIFF__MAX_INDEX
  61 };
  62
  63 struct diff_hpp_fmt {
  64         struct perf_hpp_fmt      fmt;
  65         int                      idx;
  66         char                    *header;
  67         int                      header_width;
  68 };
  69
  70 struct data__file {
  71         struct perf_session     *session;
  72         struct perf_data         data;
  73         int                      idx;
  74         struct hists            *hists;
  75         struct diff_hpp_fmt      fmt[PERF_HPP_DIFF__MAX_INDEX];
  76 };
  77
  78 static struct data__file *data__files;
  79 static int data__files_cnt;
  80
  81 #define data__for_each_file_start(i, d, s)      \
  82         for (i = s, d = &data__files[s];        \
  83              i < data__files_cnt;               \
  84              i++, d = &data__files[i])
  85
  86 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
  87 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
  88
  89 static bool force;
  90 static bool show_period;
  91 static bool show_formula;
  92 static bool show_baseline_only;
  93 static bool cycles_hist;
  94 static unsigned int sort_compute = 1;
  95
  96 static s64 compute_wdiff_w1;
  97 static s64 compute_wdiff_w2;
  98
  99 static const char               *cpu_list;
 100 static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 101
 102 enum {
 103         COMPUTE_DELTA,
 104         COMPUTE_RATIO,
 105         COMPUTE_WEIGHTED_DIFF,
 106         COMPUTE_DELTA_ABS,
 107         COMPUTE_CYCLES,
 108         COMPUTE_MAX,
 109 };
 110
 111 const char *compute_names[COMPUTE_MAX] = {
 112         [COMPUTE_DELTA] = "delta",
 113         [COMPUTE_DELTA_ABS] = "delta-abs",
 114         [COMPUTE_RATIO] = "ratio",
 115         [COMPUTE_WEIGHTED_DIFF] = "wdiff",
 116         [COMPUTE_CYCLES] = "cycles",
 117 };
 118
 119 static int compute = COMPUTE_DELTA_ABS;
 120
 121 static int compute_2_hpp[COMPUTE_MAX] = {
 122         [COMPUTE_DELTA]         = PERF_HPP_DIFF__DELTA,
 123         [COMPUTE_DELTA_ABS]     = PERF_HPP_DIFF__DELTA_ABS,
 124         [COMPUTE_RATIO]         = PERF_HPP_DIFF__RATIO,
 125         [COMPUTE_WEIGHTED_DIFF] = PERF_HPP_DIFF__WEIGHTED_DIFF,
 126         [COMPUTE_CYCLES]        = PERF_HPP_DIFF__CYCLES,
 127 };
 128
 129 #define MAX_COL_WIDTH 70
 130
 131 static struct header_column {
 132         const char *name;
 133         int width;
 134 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
 135         [PERF_HPP_DIFF__BASELINE] = {
 136                 .name  = "Baseline",
 137         },
 138         [PERF_HPP_DIFF__PERIOD] = {
 139                 .name  = "Period",
 140                 .width = 14,
 141         },
 142         [PERF_HPP_DIFF__PERIOD_BASELINE] = {
 143                 .name  = "Base period",
 144                 .width = 14,
 145         },
 146         [PERF_HPP_DIFF__DELTA] = {
 147                 .name  = "Delta",
 148                 .width = 7,
 149         },
 150         [PERF_HPP_DIFF__DELTA_ABS] = {
 151                 .name  = "Delta Abs",
 152                 .width = 7,
 153         },
 154         [PERF_HPP_DIFF__RATIO] = {
 155                 .name  = "Ratio",
 156                 .width = 14,
 157         },
 158         [PERF_HPP_DIFF__WEIGHTED_DIFF] = {
 159                 .name  = "Weighted diff",
 160                 .width = 14,
 161         },
 162         [PERF_HPP_DIFF__FORMULA] = {
 163                 .name  = "Formula",
 164                 .width = MAX_COL_WIDTH,
 165         },
 166         [PERF_HPP_DIFF__CYCLES] = {
 167                 .name  = "[Program Block Range] Cycles Diff",
 168                 .width = 70,
 169         },
 170         [PERF_HPP_DIFF__CYCLES_HIST] = {
 171                 .name  = "stddev/Hist",
 172                 .width = NUM_SPARKS + 9,
 173         }
 174 };
 175
 176 static int setup_compute_opt_wdiff(char *opt)
 177 {
 178         char *w1_str = opt;
 179         char *w2_str;
 180
 181         int ret = -EINVAL;
 182
 183         if (!opt)
 184                 goto out;
 185
 186         w2_str = strchr(opt, ',');
 187         if (!w2_str)
 188                 goto out;
 189
 190         *w2_str++ = 0x0;
 191         if (!*w2_str)
 192                 goto out;
 193
 194         compute_wdiff_w1 = strtol(w1_str, NULL, 10);
 195         compute_wdiff_w2 = strtol(w2_str, NULL, 10);
 196
 197         if (!compute_wdiff_w1 || !compute_wdiff_w2)
 198                 goto out;
 199
 200         pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
 201                   compute_wdiff_w1, compute_wdiff_w2);
 202
 203         ret = 0;
 204
 205  out:
 206         if (ret)
 207                 pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
 208
 209         return ret;
 210 }
 211
 212 static int setup_compute_opt(char *opt)
 213 {
 214         if (compute == COMPUTE_WEIGHTED_DIFF)
 215                 return setup_compute_opt_wdiff(opt);
 216
 217         if (opt) {
 218                 pr_err("Failed: extra option specified '%s'", opt);
 219                 return -EINVAL;
 220         }
 221
 222         return 0;
 223 }
 224
 225 static int setup_compute(const struct option *opt, const char *str,
 226                          int unset __maybe_unused)
 227 {
 228         int *cp = (int *) opt->value;
 229         char *cstr = (char *) str;
 230         char buf[50];
 231         unsigned i;
 232         char *option;
 233
 234         if (!str) {
 235                 *cp = COMPUTE_DELTA;
 236                 return 0;
 237         }
 238
 239         option = strchr(str, ':');
 240         if (option) {
 241                 unsigned len = option++ - str;
 242
 243                 /*
 244                  * The str data are not writeable, so we need
 245                  * to use another buffer.
 246                  */
 247
 248                 /* No option value is longer. */
 249                 if (len >= sizeof(buf))
 250                         return -EINVAL;
 251
 252                 strncpy(buf, str, len);
 253                 buf[len] = 0x0;
 254                 cstr = buf;
 255         }
 256
 257         for (i = 0; i < COMPUTE_MAX; i++)
 258                 if (!strcmp(cstr, compute_names[i])) {
 259                         *cp = i;
 260                         return setup_compute_opt(option);
 261                 }
 262
 263         pr_err("Failed: '%s' is not computation method "
 264                "(use 'delta','ratio' or 'wdiff')\n", str);
 265         return -EINVAL;
 266 }
 267
 268 static double period_percent(struct hist_entry *he, u64 period)
 269 {
 270         u64 total = hists__total_period(he->hists);
 271
 272         return (period * 100.0) / total;
 273 }
 274
 275 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
 276 {
 277         double old_percent = period_percent(he, he->stat.period);
 278         double new_percent = period_percent(pair, pair->stat.period);
 279
 280         pair->diff.period_ratio_delta = new_percent - old_percent;
 281         pair->diff.computed = true;
 282         return pair->diff.period_ratio_delta;
 283 }
 284
 285 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 286 {
 287         double old_period = he->stat.period ?: 1;
 288         double new_period = pair->stat.period;
 289
 290         pair->diff.computed = true;
 291         pair->diff.period_ratio = new_period / old_period;
 292         return pair->diff.period_ratio;
 293 }
 294
 295 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 296 {
 297         u64 old_period = he->stat.period;
 298         u64 new_period = pair->stat.period;
 299
 300         pair->diff.computed = true;
 301         pair->diff.wdiff = new_period * compute_wdiff_w2 -
 302                            old_period * compute_wdiff_w1;
 303
 304         return pair->diff.wdiff;
 305 }
 306
 307 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
 308                          char *buf, size_t size)
 309 {
 310         u64 he_total = he->hists->stats.total_period;
 311         u64 pair_total = pair->hists->stats.total_period;
 312
 313         if (symbol_conf.filter_relative) {
 314                 he_total = he->hists->stats.total_non_filtered_period;
 315                 pair_total = pair->hists->stats.total_non_filtered_period;
 316         }
 317         return scnprintf(buf, size,
 318                          "(%" PRIu64 " * 100 / %" PRIu64 ") - "
 319                          "(%" PRIu64 " * 100 / %" PRIu64 ")",
 320                          pair->stat.period, pair_total,
 321                          he->stat.period, he_total);
 322 }
 323
 324 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
 325                          char *buf, size_t size)
 326 {
 327         double old_period = he->stat.period;
 328         double new_period = pair->stat.period;
 329
 330         return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 331 }
 332
 333 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
 334                          char *buf, size_t size)
 335 {
 336         u64 old_period = he->stat.period;
 337         u64 new_period = pair->stat.period;
 338
 339         return scnprintf(buf, size,
 340                   "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
 341                   new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 342 }
 343
 344 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
 345                            char *buf, size_t size)
 346 {
 347         switch (compute) {
 348         case COMPUTE_DELTA:
 349         case COMPUTE_DELTA_ABS:
 350                 return formula_delta(he, pair, buf, size);
 351         case COMPUTE_RATIO:
 352                 return formula_ratio(he, pair, buf, size);
 353         case COMPUTE_WEIGHTED_DIFF:
 354                 return formula_wdiff(he, pair, buf, size);
 355         default:
 356                 BUG_ON(1);
 357         }
 358
 359         return -1;
 360 }
 361
 362 static void *block_hist_zalloc(size_t size)
 363 {
 364         struct block_hist *bh;
 365
 366         bh = zalloc(size + sizeof(*bh));
 367         if (!bh)
 368                 return NULL;
 369
 370         return &bh->he;
 371 }
 372
 373 static void block_hist_free(void *he)
 374 {
 375         struct block_hist *bh;
 376
 377         bh = container_of(he, struct block_hist, he);
 378         hists__delete_entries(&bh->block_hists);
 379         free(bh);
 380 }
 381
 382 struct hist_entry_ops block_hist_ops = {
 383         .new    = block_hist_zalloc,
 384         .free   = block_hist_free,
 385 };
 386
 387 static int diff__process_sample_event(struct perf_tool *tool,
 388                                       union perf_event *event,
 389                                       struct perf_sample *sample,
 390                                       struct evsel *evsel,
 391                                       struct machine *machine)
 392 {
 393         struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
 394         struct addr_location al;
 395         struct hists *hists = evsel__hists(evsel);
 396         int ret = -1;
 397
 398         if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
 399                                           sample->time)) {
 400                 return 0;
 401         }
 402
 403         if (machine__resolve(machine, &al, sample) < 0) {
 404                 pr_warning("problem processing %d event, skipping it.\n",
 405                            event->header.type);
 406                 return -1;
 407         }
 408
 409         if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
 410                 ret = 0;
 411                 goto out_put;
 412         }
 413
 414         if (compute != COMPUTE_CYCLES) {
 415                 if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
 416                                       true)) {
 417                         pr_warning("problem incrementing symbol period, "
 418                                    "skipping event\n");
 419                         goto out_put;
 420                 }
 421         } else {
 422                 if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
 423                                           NULL, NULL, sample, true)) {
 424                         pr_warning("problem incrementing symbol period, "
 425                                    "skipping event\n");
 426                         goto out_put;
 427                 }
 428
 429                 hist__account_cycles(sample->branch_stack, &al, sample, false,
 430                                      NULL);
 431         }
 432
 433         /*
 434          * The total_period is updated here before going to the output
 435          * tree since normally only the baseline hists will call
 436          * hists__output_resort() and precompute needs the total
 437          * period in order to sort entries by percentage delta.
 438          */
 439         hists->stats.total_period += sample->period;
 440         if (!al.filtered)
 441                 hists->stats.total_non_filtered_period += sample->period;
 442         ret = 0;
 443 out_put:
 444         addr_location__put(&al);
 445         return ret;
 446 }
 447
 448 static struct perf_diff pdiff = {
 449         .tool = {
 450                 .sample = diff__process_sample_event,
 451                 .mmap   = perf_event__process_mmap,
 452                 .mmap2  = perf_event__process_mmap2,
 453                 .comm   = perf_event__process_comm,
 454                 .exit   = perf_event__process_exit,
 455                 .fork   = perf_event__process_fork,
 456                 .lost   = perf_event__process_lost,
 457                 .namespaces = perf_event__process_namespaces,
 458                 .ordered_events = true,
 459                 .ordering_requires_timestamps = true,
 460         },
 461 };
 462
 463 static struct evsel *evsel_match(struct evsel *evsel,
 464                                       struct evlist *evlist)
 465 {
 466         struct evsel *e;
 467
 468         evlist__for_each_entry(evlist, e) {
 469                 if (perf_evsel__match2(evsel, e))
 470                         return e;
 471         }
 472
 473         return NULL;
 474 }
 475
 476 static void perf_evlist__collapse_resort(struct evlist *evlist)
 477 {
 478         struct evsel *evsel;
 479
 480         evlist__for_each_entry(evlist, evsel) {
 481                 struct hists *hists = evsel__hists(evsel);
 482
 483                 hists__collapse_resort(hists, NULL);
 484         }
 485 }
 486
 487 static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 488 {
 489         struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 490         void *ptr = dfmt - dfmt->idx;
 491         struct data__file *d = container_of(ptr, struct data__file, fmt);
 492
 493         return d;
 494 }
 495
 496 static struct hist_entry*
 497 get_pair_data(struct hist_entry *he, struct data__file *d)
 498 {
 499         if (hist_entry__has_pairs(he)) {
 500                 struct hist_entry *pair;
 501
 502                 list_for_each_entry(pair, &he->pairs.head, pairs.node)
 503                         if (pair->hists == d->hists)
 504                                 return pair;
 505         }
 506
 507         return NULL;
 508 }
 509
 510 static struct hist_entry*
 511 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 512 {
 513         struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 514
 515         return get_pair_data(he, d);
 516 }
 517
 518 static void hists__baseline_only(struct hists *hists)
 519 {
 520         struct rb_root_cached *root;
 521         struct rb_node *next;
 522
 523         if (hists__has(hists, need_collapse))
 524                 root = &hists->entries_collapsed;
 525         else
 526                 root = hists->entries_in;
 527
 528         next = rb_first_cached(root);
 529         while (next != NULL) {
 530                 struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 531
 532                 next = rb_next(&he->rb_node_in);
 533                 if (!hist_entry__next_pair(he)) {
 534                         rb_erase_cached(&he->rb_node_in, root);
 535                         hist_entry__delete(he);
 536                 }
 537         }
 538 }
 539
 540 static int64_t block_cycles_diff_cmp(struct hist_entry *left,
 541                                      struct hist_entry *right)
 542 {
 543         bool pairs_left  = hist_entry__has_pairs(left);
 544         bool pairs_right = hist_entry__has_pairs(right);
 545         s64 l, r;
 546
 547         if (!pairs_left && !pairs_right)
 548                 return 0;
 549
 550         l = llabs(left->diff.cycles);
 551         r = llabs(right->diff.cycles);
 552         return r - l;
 553 }
 554
 555 static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
 556                           struct hist_entry *left, struct hist_entry *right)
 557 {
 558         return block_cycles_diff_cmp(right, left);
 559 }
 560
 561 static void init_block_hist(struct block_hist *bh)
 562 {
 563         __hists__init(&bh->block_hists, &bh->block_list);
 564         perf_hpp_list__init(&bh->block_list);
 565
 566         INIT_LIST_HEAD(&bh->block_fmt.list);
 567         INIT_LIST_HEAD(&bh->block_fmt.sort_list);
 568         bh->block_fmt.cmp = block_info__cmp;
 569         bh->block_fmt.sort = block_sort;
 570         perf_hpp_list__register_sort_field(&bh->block_list,
 571                                            &bh->block_fmt);
 572         bh->valid = true;
 573 }
 574
 575 static int block_pair_cmp(struct hist_entry *a, struct hist_entry *b)
 576 {
 577         struct block_info *bi_a = a->block_info;
 578         struct block_info *bi_b = b->block_info;
 579         int cmp;
 580
 581         if (!bi_a->sym || !bi_b->sym)
 582                 return -1;
 583
 584         cmp = strcmp(bi_a->sym->name, bi_b->sym->name);
 585
 586         if ((!cmp) && (bi_a->start == bi_b->start) && (bi_a->end == bi_b->end))
 587                 return 0;
 588
 589         return -1;
 590 }
 591
 592 static struct hist_entry *get_block_pair(struct hist_entry *he,
 593                                          struct hists *hists_pair)
 594 {
 595         struct rb_root_cached *root = hists_pair->entries_in;
 596         struct rb_node *next = rb_first_cached(root);
 597         int cmp;
 598
 599         while (next != NULL) {
 600                 struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
 601                                                       rb_node_in);
 602
 603                 next = rb_next(&he_pair->rb_node_in);
 604
 605                 cmp = block_pair_cmp(he_pair, he);
 606                 if (!cmp)
 607                         return he_pair;
 608         }
 609
 610         return NULL;
 611 }
 612
 613 static void init_spark_values(unsigned long *svals, int num)
 614 {
 615         for (int i = 0; i < num; i++)
 616                 svals[i] = 0;
 617 }
 618
 619 static void update_spark_value(unsigned long *svals, int num,
 620                                struct stats *stats, u64 val)
 621 {
 622         int n = stats->n;
 623
 624         if (n < num)
 625                 svals[n] = val;
 626 }
 627
 628 static void compute_cycles_diff(struct hist_entry *he,
 629                                 struct hist_entry *pair)
 630 {
 631         pair->diff.computed = true;
 632         if (pair->block_info->num && he->block_info->num) {
 633                 pair->diff.cycles =
 634                         pair->block_info->cycles_aggr / pair->block_info->num_aggr -
 635                         he->block_info->cycles_aggr / he->block_info->num_aggr;
 636
 637                 if (!cycles_hist)
 638                         return;
 639
 640                 init_stats(&pair->diff.stats);
 641                 init_spark_values(pair->diff.svals, NUM_SPARKS);
 642
 643                 for (int i = 0; i < pair->block_info->num; i++) {
 644                         u64 val;
 645
 646                         if (i >= he->block_info->num || i >= NUM_SPARKS)
 647                                 break;
 648
 649                         val = llabs(pair->block_info->cycles_spark[i] -
 650                                      he->block_info->cycles_spark[i]);
 651
 652                         update_spark_value(pair->diff.svals, NUM_SPARKS,
 653                                            &pair->diff.stats, val);
 654                         update_stats(&pair->diff.stats, val);
 655                 }
 656         }
 657 }
 658
 659 static void block_hists_match(struct hists *hists_base,
 660                               struct hists *hists_pair)
 661 {
 662         struct rb_root_cached *root = hists_base->entries_in;
 663         struct rb_node *next = rb_first_cached(root);
 664
 665         while (next != NULL) {
 666                 struct hist_entry *he = rb_entry(next, struct hist_entry,
 667                                                  rb_node_in);
 668                 struct hist_entry *pair = get_block_pair(he, hists_pair);
 669
 670                 next = rb_next(&he->rb_node_in);
 671
 672                 if (pair) {
 673                         hist_entry__add_pair(pair, he);
 674                         compute_cycles_diff(he, pair);
 675                 }
 676         }
 677 }
 678
 679 static void hists__precompute(struct hists *hists)
 680 {
 681         struct rb_root_cached *root;
 682         struct rb_node *next;
 683
 684         if (hists__has(hists, need_collapse))
 685                 root = &hists->entries_collapsed;
 686         else
 687                 root = hists->entries_in;
 688
 689         next = rb_first_cached(root);
 690         while (next != NULL) {
 691                 struct block_hist *bh, *pair_bh;
 692                 struct hist_entry *he, *pair;
 693                 struct data__file *d;
 694                 int i;
 695
 696                 he   = rb_entry(next, struct hist_entry, rb_node_in);
 697                 next = rb_next(&he->rb_node_in);
 698
 699                 if (compute == COMPUTE_CYCLES) {
 700                         bh = container_of(he, struct block_hist, he);
 701                         init_block_hist(bh);
 702                         block_info__process_sym(he, bh, NULL, 0);
 703                 }
 704
 705                 data__for_each_file_new(i, d) {
 706                         pair = get_pair_data(he, d);
 707                         if (!pair)
 708                                 continue;
 709
 710                         switch (compute) {
 711                         case COMPUTE_DELTA:
 712                         case COMPUTE_DELTA_ABS:
 713                                 compute_delta(he, pair);
 714                                 break;
 715                         case COMPUTE_RATIO:
 716                                 compute_ratio(he, pair);
 717                                 break;
 718                         case COMPUTE_WEIGHTED_DIFF:
 719                                 compute_wdiff(he, pair);
 720                                 break;
 721                         case COMPUTE_CYCLES:
 722                                 pair_bh = container_of(pair, struct block_hist,
 723                                                        he);
 724                                 init_block_hist(pair_bh);
 725                                 block_info__process_sym(pair, pair_bh, NULL, 0);
 726
 727                                 bh = container_of(he, struct block_hist, he);
 728
 729                                 if (bh->valid && pair_bh->valid) {
 730                                         block_hists_match(&bh->block_hists,
 731                                                           &pair_bh->block_hists);
 732                                         hists__output_resort(&pair_bh->block_hists,
 733                                                              NULL);
 734                                 }
 735                                 break;
 736                         default:
 737                                 BUG_ON(1);
 738                         }
 739                 }
 740         }
 741 }
 742
 743 static int64_t cmp_doubles(double l, double r)
 744 {
 745         if (l > r)
 746                 return -1;
 747         else if (l < r)
 748                 return 1;
 749         else
 750                 return 0;
 751 }
 752
 753 static int64_t
 754 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 755                         int c)
 756 {
 757         switch (c) {
 758         case COMPUTE_DELTA:
 759         {
 760                 double l = left->diff.period_ratio_delta;
 761                 double r = right->diff.period_ratio_delta;
 762
 763                 return cmp_doubles(l, r);
 764         }
 765         case COMPUTE_DELTA_ABS:
 766         {
 767                 double l = fabs(left->diff.period_ratio_delta);
 768                 double r = fabs(right->diff.period_ratio_delta);
 769
 770                 return cmp_doubles(l, r);
 771         }
 772         case COMPUTE_RATIO:
 773         {
 774                 double l = left->diff.period_ratio;
 775                 double r = right->diff.period_ratio;
 776
 777                 return cmp_doubles(l, r);
 778         }
 779         case COMPUTE_WEIGHTED_DIFF:
 780         {
 781                 s64 l = left->diff.wdiff;
 782                 s64 r = right->diff.wdiff;
 783
 784                 return r - l;
 785         }
 786         default:
 787                 BUG_ON(1);
 788         }
 789
 790         return 0;
 791 }
 792
 793 static int64_t
 794 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 795                         int c, int sort_idx)
 796 {
 797         bool pairs_left  = hist_entry__has_pairs(left);
 798         bool pairs_right = hist_entry__has_pairs(right);
 799         struct hist_entry *p_right, *p_left;
 800
 801         if (!pairs_left && !pairs_right)
 802                 return 0;
 803
 804         if (!pairs_left || !pairs_right)
 805                 return pairs_left ? -1 : 1;
 806
 807         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 808         p_right = get_pair_data(right, &data__files[sort_idx]);
 809
 810         if (!p_left && !p_right)
 811                 return 0;
 812
 813         if (!p_left || !p_right)
 814                 return p_left ? -1 : 1;
 815
 816         /*
 817          * We have 2 entries of same kind, let's
 818          * make the data comparison.
 819          */
 820         return __hist_entry__cmp_compute(p_left, p_right, c);
 821 }
 822
 823 static int64_t
 824 hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 825                             int c, int sort_idx)
 826 {
 827         struct hist_entry *p_right, *p_left;
 828
 829         p_left  = get_pair_data(left,  &data__files[sort_idx]);
 830         p_right = get_pair_data(right, &data__files[sort_idx]);
 831
 832         if (!p_left && !p_right)
 833                 return 0;
 834
 835         if (!p_left || !p_right)
 836                 return p_left ? -1 : 1;
 837
 838         if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 839                 /*
 840                  * The delta can be computed without the baseline, but
 841                  * others are not.  Put those entries which have no
 842                  * values below.
 843                  */
 844                 if (left->dummy && right->dummy)
 845                         return 0;
 846
 847                 if (left->dummy || right->dummy)
 848                         return left->dummy ? 1 : -1;
 849         }
 850
 851         return __hist_entry__cmp_compute(p_left, p_right, c);
 852 }
 853
 854 static int64_t
 855 hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 856                     struct hist_entry *left __maybe_unused,
 857                     struct hist_entry *right __maybe_unused)
 858 {
 859         return 0;
 860 }
 861
 862 static int64_t
 863 hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 864                          struct hist_entry *left, struct hist_entry *right)
 865 {
 866         if (left->stat.period == right->stat.period)
 867                 return 0;
 868         return left->stat.period > right->stat.period ? 1 : -1;
 869 }
 870
 871 static int64_t
 872 hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 873                       struct hist_entry *left, struct hist_entry *right)
 874 {
 875         struct data__file *d = fmt_to_data_file(fmt);
 876
 877         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 878 }
 879
 880 static int64_t
 881 hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
 882                       struct hist_entry *left, struct hist_entry *right)
 883 {
 884         struct data__file *d = fmt_to_data_file(fmt);
 885
 886         return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
 887 }
 888
 889 static int64_t
 890 hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 891                       struct hist_entry *left, struct hist_entry *right)
 892 {
 893         struct data__file *d = fmt_to_data_file(fmt);
 894
 895         return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 896 }
 897
 898 static int64_t
 899 hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 900                       struct hist_entry *left, struct hist_entry *right)
 901 {
 902         struct data__file *d = fmt_to_data_file(fmt);
 903
 904         return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 905 }
 906
 907 static int64_t
 908 hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 909                           struct hist_entry *left, struct hist_entry *right)
 910 {
 911         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 912                                            sort_compute);
 913 }
 914
 915 static int64_t
 916 hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 917                               struct hist_entry *left, struct hist_entry *right)
 918 {
 919         return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 920                                            sort_compute);
 921 }
 922
 923 static int64_t
 924 hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 925                           struct hist_entry *left, struct hist_entry *right)
 926 {
 927         return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 928                                            sort_compute);
 929 }
 930
 931 static int64_t
 932 hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 933                           struct hist_entry *left, struct hist_entry *right)
 934 {
 935         return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 936                                            sort_compute);
 937 }
 938
 939 static void hists__process(struct hists *hists)
 940 {
 941         if (show_baseline_only)
 942                 hists__baseline_only(hists);
 943
 944         hists__precompute(hists);
 945         hists__output_resort(hists, NULL);
 946
 947         if (compute == COMPUTE_CYCLES)
 948                 symbol_conf.report_block = true;
 949
 950         hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 951                        !symbol_conf.use_callchain);
 952 }
 953
 954 static void data__fprintf(void)
 955 {
 956         struct data__file *d;
 957         int i;
 958
 959         fprintf(stdout, "# Data files:\n");
 960
 961         data__for_each_file(i, d)
 962                 fprintf(stdout, "#  [%d] %s %s\n",
 963                         d->idx, d->data.path,
 964                         !d->idx ? "(Baseline)" : "");
 965
 966         fprintf(stdout, "#\n");
 967 }
 968
 969 static void data_process(void)
 970 {
 971         struct evlist *evlist_base = data__files[0].session->evlist;
 972         struct evsel *evsel_base;
 973         bool first = true;
 974
 975         evlist__for_each_entry(evlist_base, evsel_base) {
 976                 struct hists *hists_base = evsel__hists(evsel_base);
 977                 struct data__file *d;
 978                 int i;
 979
 980                 data__for_each_file_new(i, d) {
 981                         struct evlist *evlist = d->session->evlist;
 982                         struct evsel *evsel;
 983                         struct hists *hists;
 984
 985                         evsel = evsel_match(evsel_base, evlist);
 986                         if (!evsel)
 987                                 continue;
 988
 989                         hists = evsel__hists(evsel);
 990                         d->hists = hists;
 991
 992                         hists__match(hists_base, hists);
 993
 994                         if (!show_baseline_only)
 995                                 hists__link(hists_base, hists);
 996                 }
 997
 998                 if (!quiet) {
 999                         fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
1000                                 perf_evsel__name(evsel_base));
1001                 }
1002
1003                 first = false;
1004
1005                 if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
1006                         data__fprintf();
1007
1008                 /* Don't sort callchain for perf diff */
1009                 perf_evsel__reset_sample_bit(evsel_base, CALLCHAIN);
1010
1011                 hists__process(hists_base);
1012         }
1013 }
1014
1015 static void data__free(struct data__file *d)
1016 {
1017         int col;
1018
1019         for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1020                 struct diff_hpp_fmt *fmt = &d->fmt[col];
1021
1022                 zfree(&fmt->header);
1023         }
1024 }
1025
1026 static int abstime_str_dup(char **pstr)
1027 {
1028         char *str = NULL;
1029
1030         if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1031                 str = strdup(pdiff.time_str);
1032                 if (!str)
1033                         return -ENOMEM;
1034         }
1035
1036         *pstr = str;
1037         return 0;
1038 }
1039
1040 static int parse_absolute_time(struct data__file *d, char **pstr)
1041 {
1042         char *p = *pstr;
1043         int ret;
1044
1045         /*
1046          * Absolute timestamp for one file has the format: a.b,c.d
1047          * For multiple files, the format is: a.b,c.d:a.b,c.d
1048          */
1049         p = strchr(*pstr, ':');
1050         if (p) {
1051                 if (p == *pstr) {
1052                         pr_err("Invalid time string\n");
1053                         return -EINVAL;
1054                 }
1055
1056                 *p = 0;
1057                 p++;
1058                 if (*p == 0) {
1059                         pr_err("Invalid time string\n");
1060                         return -EINVAL;
1061                 }
1062         }
1063
1064         ret = perf_time__parse_for_ranges(*pstr, d->session,
1065                                           &pdiff.ptime_range,
1066                                           &pdiff.range_size,
1067                                           &pdiff.range_num);
1068         if (ret < 0)
1069                 return ret;
1070
1071         if (!p || *p == 0)
1072                 *pstr = NULL;
1073         else
1074                 *pstr = p;
1075
1076         return ret;
1077 }
1078
1079 static int parse_percent_time(struct data__file *d)
1080 {
1081         int ret;
1082
1083         ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1084                                           &pdiff.ptime_range,
1085                                           &pdiff.range_size,
1086                                           &pdiff.range_num);
1087         return ret;
1088 }
1089
1090 static int parse_time_str(struct data__file *d, char *abstime_ostr,
1091                            char **pabstime_tmp)
1092 {
1093         int ret = 0;
1094
1095         if (abstime_ostr)
1096                 ret = parse_absolute_time(d, pabstime_tmp);
1097         else if (pdiff.time_str)
1098                 ret = parse_percent_time(d);
1099
1100         return ret;
1101 }
1102
1103 static int check_file_brstack(void)
1104 {
1105         struct data__file *d;
1106         bool has_br_stack;
1107         int i;
1108
1109         data__for_each_file(i, d) {
1110                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1111                 if (IS_ERR(d->session)) {
1112                         pr_err("Failed to open %s\n", d->data.path);
1113                         return PTR_ERR(d->session);
1114                 }
1115
1116                 has_br_stack = perf_header__has_feat(&d->session->header,
1117                                                      HEADER_BRANCH_STACK);
1118                 perf_session__delete(d->session);
1119                 if (!has_br_stack)
1120                         return 0;
1121         }
1122
1123         /* Set only all files having branch stacks */
1124         pdiff.has_br_stack = true;
1125         return 0;
1126 }
1127
1128 static int __cmd_diff(void)
1129 {
1130         struct data__file *d;
1131         int ret, i;
1132         char *abstime_ostr, *abstime_tmp;
1133
1134         ret = abstime_str_dup(&abstime_ostr);
1135         if (ret)
1136                 return ret;
1137
1138         abstime_tmp = abstime_ostr;
1139         ret = -EINVAL;
1140
1141         data__for_each_file(i, d) {
1142                 d->session = perf_session__new(&d->data, false, &pdiff.tool);
1143                 if (IS_ERR(d->session)) {
1144                         ret = PTR_ERR(d->session);
1145                         pr_err("Failed to open %s\n", d->data.path);
1146                         goto out_delete;
1147                 }
1148
1149                 if (pdiff.time_str) {
1150                         ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1151                         if (ret < 0)
1152                                 goto out_delete;
1153                 }
1154
1155                 if (cpu_list) {
1156                         ret = perf_session__cpu_bitmap(d->session, cpu_list,
1157                                                        cpu_bitmap);
1158                         if (ret < 0)
1159                                 goto out_delete;
1160                 }
1161
1162                 ret = perf_session__process_events(d->session);
1163                 if (ret) {
1164                         pr_err("Failed to process %s\n", d->data.path);
1165                         goto out_delete;
1166                 }
1167
1168                 perf_evlist__collapse_resort(d->session->evlist);
1169
1170                 if (pdiff.ptime_range)
1171                         zfree(&pdiff.ptime_range);
1172         }
1173
1174         data_process();
1175
1176  out_delete:
1177         data__for_each_file(i, d) {
1178                 perf_session__delete(d->session);
1179                 data__free(d);
1180         }
1181
1182         free(data__files);
1183
1184         if (pdiff.ptime_range)
1185                 zfree(&pdiff.ptime_range);
1186
1187         if (abstime_ostr)
1188                 free(abstime_ostr);
1189
1190         return ret;
1191 }
1192
1193 static const char * const diff_usage[] = {
1194         "perf diff [<options>] [old_file] [new_file]",
1195         NULL,
1196 };
1197
1198 static const struct option options[] = {
1199         OPT_INCR('v', "verbose", &verbose,
1200                     "be more verbose (show symbol address, etc)"),
1201         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1202         OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1203                     "Show only items with match in baseline"),
1204         OPT_CALLBACK('c', "compute", &compute,
1205                      "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1206                      "Entries differential computation selection",
1207                      setup_compute),
1208         OPT_BOOLEAN('p', "period", &show_period,
1209                     "Show period values."),
1210         OPT_BOOLEAN('F', "formula", &show_formula,
1211                     "Show formula."),
1212         OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1213                     "Show cycles histogram and standard deviation "
1214                     "- WARNING: use only with -c cycles."),
1215         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1216                     "dump raw trace in ASCII"),
1217         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1218         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1219                    "file", "kallsyms pathname"),
1220         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1221                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
1222         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1223                    "only consider symbols in these dsos"),
1224         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1225                    "only consider symbols in these comms"),
1226         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1227                    "only consider these symbols"),
1228         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1229                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1230                    " Please refer the man page for the complete list."),
1231         OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1232                    "separator for columns, no spaces will be added between "
1233                    "columns '.' is reserved."),
1234         OPT_CALLBACK(0, "symfs", NULL, "directory",
1235                      "Look for files with symbols relative to this directory",
1236                      symbol__config_symfs),
1237         OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1238         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1239                      "How to display percentage of filtered entries", parse_filter_percentage),
1240         OPT_STRING(0, "time", &pdiff.time_str, "str",
1241                    "Time span (time percent or absolute timestamp)"),
1242         OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1243         OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1244                    "only consider symbols in these pids"),
1245         OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1246                    "only consider symbols in these tids"),
1247         OPT_END()
1248 };
1249
1250 static double baseline_percent(struct hist_entry *he)
1251 {
1252         u64 total = hists__total_period(he->hists);
1253
1254         return 100.0 * he->stat.period / total;
1255 }
1256
1257 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1258                                struct perf_hpp *hpp, struct hist_entry *he)
1259 {
1260         struct diff_hpp_fmt *dfmt =
1261                 container_of(fmt, struct diff_hpp_fmt, fmt);
1262         double percent = baseline_percent(he);
1263         char pfmt[20] = " ";
1264
1265         if (!he->dummy) {
1266                 scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1267                 return percent_color_snprintf(hpp->buf, hpp->size,
1268                                               pfmt, percent);
1269         } else
1270                 return scnprintf(hpp->buf, hpp->size, "%*s",
1271                                  dfmt->header_width, pfmt);
1272 }
1273
1274 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1275 {
1276         double percent = baseline_percent(he);
1277         const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1278         int ret = 0;
1279
1280         if (!he->dummy)
1281                 ret = scnprintf(buf, size, fmt, percent);
1282
1283         return ret;
1284 }
1285
1286 static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1287                          struct perf_hpp *hpp, int width)
1288 {
1289         struct block_hist *bh = container_of(he, struct block_hist, he);
1290         struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1291         struct hist_entry *block_he;
1292         struct block_info *bi;
1293         char buf[128];
1294         char *start_line, *end_line;
1295
1296         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1297         if (!block_he) {
1298                 hpp->skip = true;
1299                 return 0;
1300         }
1301
1302         /*
1303          * Avoid printing the warning "addr2line_init failed for ..."
1304          */
1305         symbol_conf.disable_add2line_warn = true;
1306
1307         bi = block_he->block_info;
1308
1309         start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1310                                   he->ms.sym);
1311
1312         end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1313                                 he->ms.sym);
1314
1315         if ((start_line != SRCLINE_UNKNOWN) && (end_line != SRCLINE_UNKNOWN)) {
1316                 scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1317                           start_line, end_line, block_he->diff.cycles);
1318         } else {
1319                 scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1320                           bi->start, bi->end, block_he->diff.cycles);
1321         }
1322
1323         free_srcline(start_line);
1324         free_srcline(end_line);
1325
1326         return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1327 }
1328
1329 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1330                                 struct perf_hpp *hpp, struct hist_entry *he,
1331                                 int comparison_method)
1332 {
1333         struct diff_hpp_fmt *dfmt =
1334                 container_of(fmt, struct diff_hpp_fmt, fmt);
1335         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1336         double diff;
1337         s64 wdiff;
1338         char pfmt[20] = " ";
1339
1340         if (!pair) {
1341                 if (comparison_method == COMPUTE_CYCLES) {
1342                         struct block_hist *bh;
1343
1344                         bh = container_of(he, struct block_hist, he);
1345                         if (bh->block_idx)
1346                                 hpp->skip = true;
1347                 }
1348
1349                 goto no_print;
1350         }
1351
1352         switch (comparison_method) {
1353         case COMPUTE_DELTA:
1354                 if (pair->diff.computed)
1355                         diff = pair->diff.period_ratio_delta;
1356                 else
1357                         diff = compute_delta(he, pair);
1358
1359                 scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1360                 return percent_color_snprintf(hpp->buf, hpp->size,
1361                                         pfmt, diff);
1362         case COMPUTE_RATIO:
1363                 if (he->dummy)
1364                         goto dummy_print;
1365                 if (pair->diff.computed)
1366                         diff = pair->diff.period_ratio;
1367                 else
1368                         diff = compute_ratio(he, pair);
1369
1370                 scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1371                 return value_color_snprintf(hpp->buf, hpp->size,
1372                                         pfmt, diff);
1373         case COMPUTE_WEIGHTED_DIFF:
1374                 if (he->dummy)
1375                         goto dummy_print;
1376                 if (pair->diff.computed)
1377                         wdiff = pair->diff.wdiff;
1378                 else
1379                         wdiff = compute_wdiff(he, pair);
1380
1381                 scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1382                 return color_snprintf(hpp->buf, hpp->size,
1383                                 get_percent_color(wdiff),
1384                                 pfmt, wdiff);
1385         case COMPUTE_CYCLES:
1386                 return cycles_printf(he, pair, hpp, dfmt->header_width);
1387         default:
1388                 BUG_ON(1);
1389         }
1390 dummy_print:
1391         return scnprintf(hpp->buf, hpp->size, "%*s",
1392                         dfmt->header_width, "N/A");
1393 no_print:
1394         return scnprintf(hpp->buf, hpp->size, "%*s",
1395                         dfmt->header_width, pfmt);
1396 }
1397
1398 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1399                         struct perf_hpp *hpp, struct hist_entry *he)
1400 {
1401         return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1402 }
1403
1404 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1405                         struct perf_hpp *hpp, struct hist_entry *he)
1406 {
1407         return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1408 }
1409
1410 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1411                         struct perf_hpp *hpp, struct hist_entry *he)
1412 {
1413         return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1414 }
1415
1416 static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1417                              struct perf_hpp *hpp, struct hist_entry *he)
1418 {
1419         return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1420 }
1421
1422 static int all_zero(unsigned long *vals, int len)
1423 {
1424         int i;
1425
1426         for (i = 0; i < len; i++)
1427                 if (vals[i] != 0)
1428                         return 0;
1429         return 1;
1430 }
1431
1432 static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1433 {
1434         int printed;
1435
1436         if (n <= 1)
1437                 return 0;
1438
1439         if (n > NUM_SPARKS)
1440                 n = NUM_SPARKS;
1441         if (all_zero(svals, n))
1442                 return 0;
1443
1444         printed = print_spark(bf, size, svals, n);
1445         printed += scnprintf(bf + printed, size - printed, " ");
1446         return printed;
1447 }
1448
1449 static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1450                             struct perf_hpp *hpp, struct hist_entry *he)
1451 {
1452         struct diff_hpp_fmt *dfmt =
1453                 container_of(fmt, struct diff_hpp_fmt, fmt);
1454         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1455         struct block_hist *bh = container_of(he, struct block_hist, he);
1456         struct block_hist *bh_pair;
1457         struct hist_entry *block_he;
1458         char spark[32], buf[128];
1459         double r;
1460         int ret, pad;
1461
1462         if (!pair) {
1463                 if (bh->block_idx)
1464                         hpp->skip = true;
1465
1466                 goto no_print;
1467         }
1468
1469         bh_pair = container_of(pair, struct block_hist, he);
1470
1471         block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1472         if (!block_he) {
1473                 hpp->skip = true;
1474                 goto no_print;
1475         }
1476
1477         ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1478                                  block_he->diff.stats.n);
1479
1480         r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1481                              avg_stats(&block_he->diff.stats));
1482
1483         if (ret) {
1484                 /*
1485                  * Padding spaces if number of sparks less than NUM_SPARKS
1486                  * otherwise the output is not aligned.
1487                  */
1488                 pad = NUM_SPARKS - ((ret - 1) / 3);
1489                 scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1490                 ret = scnprintf(hpp->buf, hpp->size, "%*s",
1491                                 dfmt->header_width, buf);
1492
1493                 if (pad) {
1494                         ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1495                                          "%-*s", pad, " ");
1496                 }
1497
1498                 return ret;
1499         }
1500
1501 no_print:
1502         return scnprintf(hpp->buf, hpp->size, "%*s",
1503                         dfmt->header_width, " ");
1504 }
1505
1506 static void
1507 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1508 {
1509         switch (idx) {
1510         case PERF_HPP_DIFF__PERIOD_BASELINE:
1511                 scnprintf(buf, size, "%" PRIu64, he->stat.period);
1512                 break;
1513
1514         default:
1515                 break;
1516         }
1517 }
1518
1519 static void
1520 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1521                 int idx, char *buf, size_t size)
1522 {
1523         double diff;
1524         double ratio;
1525         s64 wdiff;
1526
1527         switch (idx) {
1528         case PERF_HPP_DIFF__DELTA:
1529         case PERF_HPP_DIFF__DELTA_ABS:
1530                 if (pair->diff.computed)
1531                         diff = pair->diff.period_ratio_delta;
1532                 else
1533                         diff = compute_delta(he, pair);
1534
1535                 scnprintf(buf, size, "%+4.2F%%", diff);
1536                 break;
1537
1538         case PERF_HPP_DIFF__RATIO:
1539                 /* No point for ratio number if we are dummy.. */
1540                 if (he->dummy) {
1541                         scnprintf(buf, size, "N/A");
1542                         break;
1543                 }
1544
1545                 if (pair->diff.computed)
1546                         ratio = pair->diff.period_ratio;
1547                 else
1548                         ratio = compute_ratio(he, pair);
1549
1550                 if (ratio > 0.0)
1551                         scnprintf(buf, size, "%14.6F", ratio);
1552                 break;
1553
1554         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1555                 /* No point for wdiff number if we are dummy.. */
1556                 if (he->dummy) {
1557                         scnprintf(buf, size, "N/A");
1558                         break;
1559                 }
1560
1561                 if (pair->diff.computed)
1562                         wdiff = pair->diff.wdiff;
1563                 else
1564                         wdiff = compute_wdiff(he, pair);
1565
1566                 if (wdiff != 0)
1567                         scnprintf(buf, size, "%14ld", wdiff);
1568                 break;
1569
1570         case PERF_HPP_DIFF__FORMULA:
1571                 formula_fprintf(he, pair, buf, size);
1572                 break;
1573
1574         case PERF_HPP_DIFF__PERIOD:
1575                 scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1576                 break;
1577
1578         default:
1579                 BUG_ON(1);
1580         };
1581 }
1582
1583 static void
1584 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1585                     char *buf, size_t size)
1586 {
1587         struct hist_entry *pair = get_pair_fmt(he, dfmt);
1588         int idx = dfmt->idx;
1589
1590         /* baseline is special */
1591         if (idx == PERF_HPP_DIFF__BASELINE)
1592                 hpp__entry_baseline(he, buf, size);
1593         else {
1594                 if (pair)
1595                         hpp__entry_pair(he, pair, idx, buf, size);
1596                 else
1597                         hpp__entry_unpair(he, idx, buf, size);
1598         }
1599 }
1600
1601 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1602                              struct hist_entry *he)
1603 {
1604         struct diff_hpp_fmt *dfmt =
1605                 container_of(_fmt, struct diff_hpp_fmt, fmt);
1606         char buf[MAX_COL_WIDTH] = " ";
1607
1608         __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1609
1610         if (symbol_conf.field_sep)
1611                 return scnprintf(hpp->buf, hpp->size, "%s", buf);
1612         else
1613                 return scnprintf(hpp->buf, hpp->size, "%*s",
1614                                  dfmt->header_width, buf);
1615 }
1616
1617 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1618                        struct hists *hists __maybe_unused,
1619                        int line __maybe_unused,
1620                        int *span __maybe_unused)
1621 {
1622         struct diff_hpp_fmt *dfmt =
1623                 container_of(fmt, struct diff_hpp_fmt, fmt);
1624
1625         BUG_ON(!dfmt->header);
1626         return scnprintf(hpp->buf, hpp->size, dfmt->header);
1627 }
1628
1629 static int hpp__width(struct perf_hpp_fmt *fmt,
1630                       struct perf_hpp *hpp __maybe_unused,
1631                       struct hists *hists __maybe_unused)
1632 {
1633         struct diff_hpp_fmt *dfmt =
1634                 container_of(fmt, struct diff_hpp_fmt, fmt);
1635
1636         BUG_ON(dfmt->header_width <= 0);
1637         return dfmt->header_width;
1638 }
1639
1640 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1641 {
1642 #define MAX_HEADER_NAME 100
1643         char buf_indent[MAX_HEADER_NAME];
1644         char buf[MAX_HEADER_NAME];
1645         const char *header = NULL;
1646         int width = 0;
1647
1648         BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1649         header = columns[dfmt->idx].name;
1650         width  = columns[dfmt->idx].width;
1651
1652         /* Only our defined HPP fmts should appear here. */
1653         BUG_ON(!header);
1654
1655         if (data__files_cnt > 2)
1656                 scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1657
1658 #define NAME (data__files_cnt > 2 ? buf : header)
1659         dfmt->header_width = width;
1660         width = (int) strlen(NAME);
1661         if (dfmt->header_width < width)
1662                 dfmt->header_width = width;
1663
1664         scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1665                   dfmt->header_width, NAME);
1666
1667         dfmt->header = strdup(buf_indent);
1668 #undef MAX_HEADER_NAME
1669 #undef NAME
1670 }
1671
1672 static void data__hpp_register(struct data__file *d, int idx)
1673 {
1674         struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1675         struct perf_hpp_fmt *fmt = &dfmt->fmt;
1676
1677         dfmt->idx = idx;
1678
1679         fmt->header = hpp__header;
1680         fmt->width  = hpp__width;
1681         fmt->entry  = hpp__entry_global;
1682         fmt->cmp    = hist_entry__cmp_nop;
1683         fmt->collapse = hist_entry__cmp_nop;
1684
1685         /* TODO more colors */
1686         switch (idx) {
1687         case PERF_HPP_DIFF__BASELINE:
1688                 fmt->color = hpp__color_baseline;
1689                 fmt->sort  = hist_entry__cmp_baseline;
1690                 break;
1691         case PERF_HPP_DIFF__DELTA:
1692                 fmt->color = hpp__color_delta;
1693                 fmt->sort  = hist_entry__cmp_delta;
1694                 break;
1695         case PERF_HPP_DIFF__RATIO:
1696                 fmt->color = hpp__color_ratio;
1697                 fmt->sort  = hist_entry__cmp_ratio;
1698                 break;
1699         case PERF_HPP_DIFF__WEIGHTED_DIFF:
1700                 fmt->color = hpp__color_wdiff;
1701                 fmt->sort  = hist_entry__cmp_wdiff;
1702                 break;
1703         case PERF_HPP_DIFF__DELTA_ABS:
1704                 fmt->color = hpp__color_delta;
1705                 fmt->sort  = hist_entry__cmp_delta_abs;
1706                 break;
1707         case PERF_HPP_DIFF__CYCLES:
1708                 fmt->color = hpp__color_cycles;
1709                 fmt->sort  = hist_entry__cmp_nop;
1710                 break;
1711         case PERF_HPP_DIFF__CYCLES_HIST:
1712                 fmt->color = hpp__color_cycles_hist;
1713                 fmt->sort  = hist_entry__cmp_nop;
1714                 break;
1715         default:
1716                 fmt->sort  = hist_entry__cmp_nop;
1717                 break;
1718         }
1719
1720         init_header(d, dfmt);
1721         perf_hpp__column_register(fmt);
1722         perf_hpp__register_sort_field(fmt);
1723 }
1724
1725 static int ui_init(void)
1726 {
1727         struct data__file *d;
1728         struct perf_hpp_fmt *fmt;
1729         int i;
1730
1731         data__for_each_file(i, d) {
1732
1733                 /*
1734                  * Baseline or compute realted columns:
1735                  *
1736                  *   PERF_HPP_DIFF__BASELINE
1737                  *   PERF_HPP_DIFF__DELTA
1738                  *   PERF_HPP_DIFF__RATIO
1739                  *   PERF_HPP_DIFF__WEIGHTED_DIFF
1740                  *   PERF_HPP_DIFF__CYCLES
1741                  */
1742                 data__hpp_register(d, i ? compute_2_hpp[compute] :
1743                                           PERF_HPP_DIFF__BASELINE);
1744
1745                 if (cycles_hist && i)
1746                         data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1747
1748                 /*
1749                  * And the rest:
1750                  *
1751                  * PERF_HPP_DIFF__FORMULA
1752                  * PERF_HPP_DIFF__PERIOD
1753                  * PERF_HPP_DIFF__PERIOD_BASELINE
1754                  */
1755                 if (show_formula && i)
1756                         data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1757
1758                 if (show_period)
1759                         data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1760                                                   PERF_HPP_DIFF__PERIOD_BASELINE);
1761         }
1762
1763         if (!sort_compute)
1764                 return 0;
1765
1766         /*
1767          * Prepend an fmt to sort on columns at 'sort_compute' first.
1768          * This fmt is added only to the sort list but not to the
1769          * output fields list.
1770          *
1771          * Note that this column (data) can be compared twice - one
1772          * for this 'sort_compute' fmt and another for the normal
1773          * diff_hpp_fmt.  But it shouldn't a problem as most entries
1774          * will be sorted out by first try or baseline and comparing
1775          * is not a costly operation.
1776          */
1777         fmt = zalloc(sizeof(*fmt));
1778         if (fmt == NULL) {
1779                 pr_err("Memory allocation failed\n");
1780                 return -1;
1781         }
1782
1783         fmt->cmp      = hist_entry__cmp_nop;
1784         fmt->collapse = hist_entry__cmp_nop;
1785
1786         switch (compute) {
1787         case COMPUTE_DELTA:
1788                 fmt->sort = hist_entry__cmp_delta_idx;
1789                 break;
1790         case COMPUTE_RATIO:
1791                 fmt->sort = hist_entry__cmp_ratio_idx;
1792                 break;
1793         case COMPUTE_WEIGHTED_DIFF:
1794                 fmt->sort = hist_entry__cmp_wdiff_idx;
1795                 break;
1796         case COMPUTE_DELTA_ABS:
1797                 fmt->sort = hist_entry__cmp_delta_abs_idx;
1798                 break;
1799         case COMPUTE_CYCLES:
1800                 /*
1801                  * Should set since 'fmt->sort' is called without
1802                  * checking valid during sorting
1803                  */
1804                 fmt->sort = hist_entry__cmp_nop;
1805                 break;
1806         default:
1807                 BUG_ON(1);
1808         }
1809
1810         perf_hpp__prepend_sort_field(fmt);
1811         return 0;
1812 }
1813
1814 static int data_init(int argc, const char **argv)
1815 {
1816         struct data__file *d;
1817         static const char *defaults[] = {
1818                 "perf.data.old",
1819                 "perf.data",
1820         };
1821         bool use_default = true;
1822         int i;
1823
1824         data__files_cnt = 2;
1825
1826         if (argc) {
1827                 if (argc == 1)
1828                         defaults[1] = argv[0];
1829                 else {
1830                         data__files_cnt = argc;
1831                         use_default = false;
1832                 }
1833         } else if (perf_guest) {
1834                 defaults[0] = "perf.data.host";
1835                 defaults[1] = "perf.data.guest";
1836         }
1837
1838         if (sort_compute >= (unsigned int) data__files_cnt) {
1839                 pr_err("Order option out of limit.\n");
1840                 return -EINVAL;
1841         }
1842
1843         data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1844         if (!data__files)
1845                 return -ENOMEM;
1846
1847         data__for_each_file(i, d) {
1848                 struct perf_data *data = &d->data;
1849
1850                 data->path  = use_default ? defaults[i] : argv[i];
1851                 data->mode  = PERF_DATA_MODE_READ,
1852                 data->force = force,
1853
1854                 d->idx  = i;
1855         }
1856
1857         return 0;
1858 }
1859
1860 static int diff__config(const char *var, const char *value,
1861                         void *cb __maybe_unused)
1862 {
1863         if (!strcmp(var, "diff.order")) {
1864                 int ret;
1865                 if (perf_config_int(&ret, var, value) < 0)
1866                         return -1;
1867                 sort_compute = ret;
1868                 return 0;
1869         }
1870         if (!strcmp(var, "diff.compute")) {
1871                 if (!strcmp(value, "delta")) {
1872                         compute = COMPUTE_DELTA;
1873                 } else if (!strcmp(value, "delta-abs")) {
1874                         compute = COMPUTE_DELTA_ABS;
1875                 } else if (!strcmp(value, "ratio")) {
1876                         compute = COMPUTE_RATIO;
1877                 } else if (!strcmp(value, "wdiff")) {
1878                         compute = COMPUTE_WEIGHTED_DIFF;
1879                 } else {
1880                         pr_err("Invalid compute method: %s\n", value);
1881                         return -1;
1882                 }
1883         }
1884
1885         return 0;
1886 }
1887
1888 int cmd_diff(int argc, const char **argv)
1889 {
1890         int ret = hists__init();
1891
1892         if (ret < 0)
1893                 return ret;
1894
1895         perf_config(diff__config, NULL);
1896
1897         argc = parse_options(argc, argv, options, diff_usage, 0);
1898
1899         if (quiet)
1900                 perf_quiet_option();
1901
1902         if (cycles_hist && (compute != COMPUTE_CYCLES))
1903                 usage_with_options(diff_usage, options);
1904
1905         symbol__annotation_init();
1906
1907         if (symbol__init(NULL) < 0)
1908                 return -1;
1909
1910         if (data_init(argc, argv) < 0)
1911                 return -1;
1912
1913         if (check_file_brstack() < 0)
1914                 return -1;
1915
1916         if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
1917                 return -1;
1918
1919         if (ui_init() < 0)
1920                 return -1;
1921
1922         sort__mode = SORT_MODE__DIFF;
1923
1924         if (setup_sorting(NULL) < 0)
1925                 usage_with_options(diff_usage, options);
1926
1927         setup_pager();
1928
1929         sort__setup_elide(NULL);
1930
1931         return __cmd_diff();
1932 }