linux/tools/perf/builtin-diff.c
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   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
  39struct 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. */
  50enum {
  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
  65struct diff_hpp_fmt {
  66        struct perf_hpp_fmt      fmt;
  67        int                      idx;
  68        char                    *header;
  69        int                      header_width;
  70};
  71
  72struct 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
  81static struct data__file *data__files;
  82static 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
  92static bool force;
  93static bool show_period;
  94static bool show_formula;
  95static bool show_baseline_only;
  96static bool cycles_hist;
  97static unsigned int sort_compute = 1;
  98
  99static s64 compute_wdiff_w1;
 100static s64 compute_wdiff_w2;
 101
 102static const char               *cpu_list;
 103static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 104
 105enum {
 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
 115const 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
 123static int compute = COMPUTE_DELTA_ABS;
 124
 125static 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
 135static 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
 180static 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
 216static 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
 229static 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
 272static 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
 279static 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
 289static 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
 299static 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
 311static 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
 328static 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
 337static 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
 348static 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
 366static 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
 377static 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
 386struct hist_entry_ops block_hist_ops = {
 387        .new    = block_hist_zalloc,
 388        .free   = block_hist_free,
 389};
 390
 391static 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;
 463out_put:
 464        addr_location__put(&al);
 465        return ret;
 466}
 467
 468static 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
 484static 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
 497static 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
 508static 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
 517static struct hist_entry*
 518get_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
 531static struct hist_entry*
 532get_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
 539static 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
 561static 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
 576static 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
 582static 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
 596static 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
 617static void init_spark_values(unsigned long *svals, int num)
 618{
 619        for (int i = 0; i < num; i++)
 620                svals[i] = 0;
 621}
 622
 623static 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
 632static 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
 663static 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
 683static 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
 747static 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
 757static 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
 797static int64_t
 798hist_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
 827static int64_t
 828hist_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
 858static int64_t
 859hist_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
 866static int64_t
 867hist_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
 875static int64_t
 876hist_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
 884static int64_t
 885hist_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
 893static int64_t
 894hist_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
 902static int64_t
 903hist_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
 911static int64_t
 912hist_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
 919static int64_t
 920hist_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
 927static int64_t
 928hist_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
 935static int64_t
 936hist_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
 943static 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
 958static 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
 973static 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
1019static 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
1050static 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
1061static 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
1075static 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
1089static 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
1128static 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
1139static 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
1152static 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
1177static 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                if (!IS_ERR(d->session))
1240                        perf_session__delete(d->session);
1241                data__free(d);
1242        }
1243
1244        free(data__files);
1245
1246        if (pdiff.ptime_range)
1247                zfree(&pdiff.ptime_range);
1248
1249        if (abstime_ostr)
1250                free(abstime_ostr);
1251
1252        return ret;
1253}
1254
1255static const char * const diff_usage[] = {
1256        "perf diff [<options>] [old_file] [new_file]",
1257        NULL,
1258};
1259
1260static const struct option options[] = {
1261        OPT_INCR('v', "verbose", &verbose,
1262                    "be more verbose (show symbol address, etc)"),
1263        OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
1264        OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1265                    "Show only items with match in baseline"),
1266        OPT_CALLBACK('c', "compute", &compute,
1267                     "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1268                     "Entries differential computation selection",
1269                     setup_compute),
1270        OPT_BOOLEAN('p', "period", &show_period,
1271                    "Show period values."),
1272        OPT_BOOLEAN('F', "formula", &show_formula,
1273                    "Show formula."),
1274        OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1275                    "Show cycles histogram and standard deviation "
1276                    "- WARNING: use only with -c cycles."),
1277        OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1278                    "dump raw trace in ASCII"),
1279        OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1280        OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1281                   "file", "kallsyms pathname"),
1282        OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1283                    "load module symbols - WARNING: use only with -k and LIVE kernel"),
1284        OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1285                   "only consider symbols in these dsos"),
1286        OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1287                   "only consider symbols in these comms"),
1288        OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1289                   "only consider these symbols"),
1290        OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1291                   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1292                   " Please refer the man page for the complete list."),
1293        OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1294                   "separator for columns, no spaces will be added between "
1295                   "columns '.' is reserved."),
1296        OPT_CALLBACK(0, "symfs", NULL, "directory",
1297                     "Look for files with symbols relative to this directory",
1298                     symbol__config_symfs),
1299        OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1300        OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1301                     "How to display percentage of filtered entries", parse_filter_percentage),
1302        OPT_STRING(0, "time", &pdiff.time_str, "str",
1303                   "Time span (time percent or absolute timestamp)"),
1304        OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1305        OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1306                   "only consider symbols in these pids"),
1307        OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1308                   "only consider symbols in these tids"),
1309        OPT_BOOLEAN(0, "stream", &pdiff.stream,
1310                    "Enable hot streams comparison."),
1311        OPT_END()
1312};
1313
1314static double baseline_percent(struct hist_entry *he)
1315{
1316        u64 total = hists__total_period(he->hists);
1317
1318        return 100.0 * he->stat.period / total;
1319}
1320
1321static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1322                               struct perf_hpp *hpp, struct hist_entry *he)
1323{
1324        struct diff_hpp_fmt *dfmt =
1325                container_of(fmt, struct diff_hpp_fmt, fmt);
1326        double percent = baseline_percent(he);
1327        char pfmt[20] = " ";
1328
1329        if (!he->dummy) {
1330                scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1331                return percent_color_snprintf(hpp->buf, hpp->size,
1332                                              pfmt, percent);
1333        } else
1334                return scnprintf(hpp->buf, hpp->size, "%*s",
1335                                 dfmt->header_width, pfmt);
1336}
1337
1338static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1339{
1340        double percent = baseline_percent(he);
1341        const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1342        int ret = 0;
1343
1344        if (!he->dummy)
1345                ret = scnprintf(buf, size, fmt, percent);
1346
1347        return ret;
1348}
1349
1350static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1351                         struct perf_hpp *hpp, int width)
1352{
1353        struct block_hist *bh = container_of(he, struct block_hist, he);
1354        struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1355        struct hist_entry *block_he;
1356        struct block_info *bi;
1357        char buf[128];
1358        char *start_line, *end_line;
1359
1360        block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1361        if (!block_he) {
1362                hpp->skip = true;
1363                return 0;
1364        }
1365
1366        /*
1367         * Avoid printing the warning "addr2line_init failed for ..."
1368         */
1369        symbol_conf.disable_add2line_warn = true;
1370
1371        bi = block_he->block_info;
1372
1373        start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1374                                  he->ms.sym);
1375
1376        end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1377                                he->ms.sym);
1378
1379        if ((strncmp(start_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0) &&
1380            (strncmp(end_line, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)) {
1381                scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1382                          start_line, end_line, block_he->diff.cycles);
1383        } else {
1384                scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1385                          bi->start, bi->end, block_he->diff.cycles);
1386        }
1387
1388        free_srcline(start_line);
1389        free_srcline(end_line);
1390
1391        return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1392}
1393
1394static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1395                                struct perf_hpp *hpp, struct hist_entry *he,
1396                                int comparison_method)
1397{
1398        struct diff_hpp_fmt *dfmt =
1399                container_of(fmt, struct diff_hpp_fmt, fmt);
1400        struct hist_entry *pair = get_pair_fmt(he, dfmt);
1401        double diff;
1402        s64 wdiff;
1403        char pfmt[20] = " ";
1404
1405        if (!pair) {
1406                if (comparison_method == COMPUTE_CYCLES) {
1407                        struct block_hist *bh;
1408
1409                        bh = container_of(he, struct block_hist, he);
1410                        if (bh->block_idx)
1411                                hpp->skip = true;
1412                }
1413
1414                goto no_print;
1415        }
1416
1417        switch (comparison_method) {
1418        case COMPUTE_DELTA:
1419                if (pair->diff.computed)
1420                        diff = pair->diff.period_ratio_delta;
1421                else
1422                        diff = compute_delta(he, pair);
1423
1424                scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1425                return percent_color_snprintf(hpp->buf, hpp->size,
1426                                        pfmt, diff);
1427        case COMPUTE_RATIO:
1428                if (he->dummy)
1429                        goto dummy_print;
1430                if (pair->diff.computed)
1431                        diff = pair->diff.period_ratio;
1432                else
1433                        diff = compute_ratio(he, pair);
1434
1435                scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1436                return value_color_snprintf(hpp->buf, hpp->size,
1437                                        pfmt, diff);
1438        case COMPUTE_WEIGHTED_DIFF:
1439                if (he->dummy)
1440                        goto dummy_print;
1441                if (pair->diff.computed)
1442                        wdiff = pair->diff.wdiff;
1443                else
1444                        wdiff = compute_wdiff(he, pair);
1445
1446                scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1447                return color_snprintf(hpp->buf, hpp->size,
1448                                get_percent_color(wdiff),
1449                                pfmt, wdiff);
1450        case COMPUTE_CYCLES:
1451                return cycles_printf(he, pair, hpp, dfmt->header_width);
1452        default:
1453                BUG_ON(1);
1454        }
1455dummy_print:
1456        return scnprintf(hpp->buf, hpp->size, "%*s",
1457                        dfmt->header_width, "N/A");
1458no_print:
1459        return scnprintf(hpp->buf, hpp->size, "%*s",
1460                        dfmt->header_width, pfmt);
1461}
1462
1463static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1464                        struct perf_hpp *hpp, struct hist_entry *he)
1465{
1466        return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1467}
1468
1469static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1470                        struct perf_hpp *hpp, struct hist_entry *he)
1471{
1472        return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1473}
1474
1475static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1476                        struct perf_hpp *hpp, struct hist_entry *he)
1477{
1478        return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1479}
1480
1481static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1482                             struct perf_hpp *hpp, struct hist_entry *he)
1483{
1484        return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1485}
1486
1487static int all_zero(unsigned long *vals, int len)
1488{
1489        int i;
1490
1491        for (i = 0; i < len; i++)
1492                if (vals[i] != 0)
1493                        return 0;
1494        return 1;
1495}
1496
1497static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1498{
1499        int printed;
1500
1501        if (n <= 1)
1502                return 0;
1503
1504        if (n > NUM_SPARKS)
1505                n = NUM_SPARKS;
1506        if (all_zero(svals, n))
1507                return 0;
1508
1509        printed = print_spark(bf, size, svals, n);
1510        printed += scnprintf(bf + printed, size - printed, " ");
1511        return printed;
1512}
1513
1514static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1515                            struct perf_hpp *hpp, struct hist_entry *he)
1516{
1517        struct diff_hpp_fmt *dfmt =
1518                container_of(fmt, struct diff_hpp_fmt, fmt);
1519        struct hist_entry *pair = get_pair_fmt(he, dfmt);
1520        struct block_hist *bh = container_of(he, struct block_hist, he);
1521        struct block_hist *bh_pair;
1522        struct hist_entry *block_he;
1523        char spark[32], buf[128];
1524        double r;
1525        int ret, pad;
1526
1527        if (!pair) {
1528                if (bh->block_idx)
1529                        hpp->skip = true;
1530
1531                goto no_print;
1532        }
1533
1534        bh_pair = container_of(pair, struct block_hist, he);
1535
1536        block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1537        if (!block_he) {
1538                hpp->skip = true;
1539                goto no_print;
1540        }
1541
1542        ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1543                                 block_he->diff.stats.n);
1544
1545        r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1546                             avg_stats(&block_he->diff.stats));
1547
1548        if (ret) {
1549                /*
1550                 * Padding spaces if number of sparks less than NUM_SPARKS
1551                 * otherwise the output is not aligned.
1552                 */
1553                pad = NUM_SPARKS - ((ret - 1) / 3);
1554                scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1555                ret = scnprintf(hpp->buf, hpp->size, "%*s",
1556                                dfmt->header_width, buf);
1557
1558                if (pad) {
1559                        ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1560                                         "%-*s", pad, " ");
1561                }
1562
1563                return ret;
1564        }
1565
1566no_print:
1567        return scnprintf(hpp->buf, hpp->size, "%*s",
1568                        dfmt->header_width, " ");
1569}
1570
1571static void
1572hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1573{
1574        switch (idx) {
1575        case PERF_HPP_DIFF__PERIOD_BASELINE:
1576                scnprintf(buf, size, "%" PRIu64, he->stat.period);
1577                break;
1578
1579        default:
1580                break;
1581        }
1582}
1583
1584static void
1585hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1586                int idx, char *buf, size_t size)
1587{
1588        double diff;
1589        double ratio;
1590        s64 wdiff;
1591
1592        switch (idx) {
1593        case PERF_HPP_DIFF__DELTA:
1594        case PERF_HPP_DIFF__DELTA_ABS:
1595                if (pair->diff.computed)
1596                        diff = pair->diff.period_ratio_delta;
1597                else
1598                        diff = compute_delta(he, pair);
1599
1600                scnprintf(buf, size, "%+4.2F%%", diff);
1601                break;
1602
1603        case PERF_HPP_DIFF__RATIO:
1604                /* No point for ratio number if we are dummy.. */
1605                if (he->dummy) {
1606                        scnprintf(buf, size, "N/A");
1607                        break;
1608                }
1609
1610                if (pair->diff.computed)
1611                        ratio = pair->diff.period_ratio;
1612                else
1613                        ratio = compute_ratio(he, pair);
1614
1615                if (ratio > 0.0)
1616                        scnprintf(buf, size, "%14.6F", ratio);
1617                break;
1618
1619        case PERF_HPP_DIFF__WEIGHTED_DIFF:
1620                /* No point for wdiff number if we are dummy.. */
1621                if (he->dummy) {
1622                        scnprintf(buf, size, "N/A");
1623                        break;
1624                }
1625
1626                if (pair->diff.computed)
1627                        wdiff = pair->diff.wdiff;
1628                else
1629                        wdiff = compute_wdiff(he, pair);
1630
1631                if (wdiff != 0)
1632                        scnprintf(buf, size, "%14ld", wdiff);
1633                break;
1634
1635        case PERF_HPP_DIFF__FORMULA:
1636                formula_fprintf(he, pair, buf, size);
1637                break;
1638
1639        case PERF_HPP_DIFF__PERIOD:
1640                scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1641                break;
1642
1643        default:
1644                BUG_ON(1);
1645        }
1646}
1647
1648static void
1649__hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1650                    char *buf, size_t size)
1651{
1652        struct hist_entry *pair = get_pair_fmt(he, dfmt);
1653        int idx = dfmt->idx;
1654
1655        /* baseline is special */
1656        if (idx == PERF_HPP_DIFF__BASELINE)
1657                hpp__entry_baseline(he, buf, size);
1658        else {
1659                if (pair)
1660                        hpp__entry_pair(he, pair, idx, buf, size);
1661                else
1662                        hpp__entry_unpair(he, idx, buf, size);
1663        }
1664}
1665
1666static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1667                             struct hist_entry *he)
1668{
1669        struct diff_hpp_fmt *dfmt =
1670                container_of(_fmt, struct diff_hpp_fmt, fmt);
1671        char buf[MAX_COL_WIDTH] = " ";
1672
1673        __hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1674
1675        if (symbol_conf.field_sep)
1676                return scnprintf(hpp->buf, hpp->size, "%s", buf);
1677        else
1678                return scnprintf(hpp->buf, hpp->size, "%*s",
1679                                 dfmt->header_width, buf);
1680}
1681
1682static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1683                       struct hists *hists __maybe_unused,
1684                       int line __maybe_unused,
1685                       int *span __maybe_unused)
1686{
1687        struct diff_hpp_fmt *dfmt =
1688                container_of(fmt, struct diff_hpp_fmt, fmt);
1689
1690        BUG_ON(!dfmt->header);
1691        return scnprintf(hpp->buf, hpp->size, dfmt->header);
1692}
1693
1694static int hpp__width(struct perf_hpp_fmt *fmt,
1695                      struct perf_hpp *hpp __maybe_unused,
1696                      struct hists *hists __maybe_unused)
1697{
1698        struct diff_hpp_fmt *dfmt =
1699                container_of(fmt, struct diff_hpp_fmt, fmt);
1700
1701        BUG_ON(dfmt->header_width <= 0);
1702        return dfmt->header_width;
1703}
1704
1705static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1706{
1707#define MAX_HEADER_NAME 100
1708        char buf_indent[MAX_HEADER_NAME];
1709        char buf[MAX_HEADER_NAME];
1710        const char *header = NULL;
1711        int width = 0;
1712
1713        BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1714        header = columns[dfmt->idx].name;
1715        width  = columns[dfmt->idx].width;
1716
1717        /* Only our defined HPP fmts should appear here. */
1718        BUG_ON(!header);
1719
1720        if (data__files_cnt > 2)
1721                scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1722
1723#define NAME (data__files_cnt > 2 ? buf : header)
1724        dfmt->header_width = width;
1725        width = (int) strlen(NAME);
1726        if (dfmt->header_width < width)
1727                dfmt->header_width = width;
1728
1729        scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1730                  dfmt->header_width, NAME);
1731
1732        dfmt->header = strdup(buf_indent);
1733#undef MAX_HEADER_NAME
1734#undef NAME
1735}
1736
1737static void data__hpp_register(struct data__file *d, int idx)
1738{
1739        struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1740        struct perf_hpp_fmt *fmt = &dfmt->fmt;
1741
1742        dfmt->idx = idx;
1743
1744        fmt->header = hpp__header;
1745        fmt->width  = hpp__width;
1746        fmt->entry  = hpp__entry_global;
1747        fmt->cmp    = hist_entry__cmp_nop;
1748        fmt->collapse = hist_entry__cmp_nop;
1749
1750        /* TODO more colors */
1751        switch (idx) {
1752        case PERF_HPP_DIFF__BASELINE:
1753                fmt->color = hpp__color_baseline;
1754                fmt->sort  = hist_entry__cmp_baseline;
1755                break;
1756        case PERF_HPP_DIFF__DELTA:
1757                fmt->color = hpp__color_delta;
1758                fmt->sort  = hist_entry__cmp_delta;
1759                break;
1760        case PERF_HPP_DIFF__RATIO:
1761                fmt->color = hpp__color_ratio;
1762                fmt->sort  = hist_entry__cmp_ratio;
1763                break;
1764        case PERF_HPP_DIFF__WEIGHTED_DIFF:
1765                fmt->color = hpp__color_wdiff;
1766                fmt->sort  = hist_entry__cmp_wdiff;
1767                break;
1768        case PERF_HPP_DIFF__DELTA_ABS:
1769                fmt->color = hpp__color_delta;
1770                fmt->sort  = hist_entry__cmp_delta_abs;
1771                break;
1772        case PERF_HPP_DIFF__CYCLES:
1773                fmt->color = hpp__color_cycles;
1774                fmt->sort  = hist_entry__cmp_nop;
1775                break;
1776        case PERF_HPP_DIFF__CYCLES_HIST:
1777                fmt->color = hpp__color_cycles_hist;
1778                fmt->sort  = hist_entry__cmp_nop;
1779                break;
1780        default:
1781                fmt->sort  = hist_entry__cmp_nop;
1782                break;
1783        }
1784
1785        init_header(d, dfmt);
1786        perf_hpp__column_register(fmt);
1787        perf_hpp__register_sort_field(fmt);
1788}
1789
1790static int ui_init(void)
1791{
1792        struct data__file *d;
1793        struct perf_hpp_fmt *fmt;
1794        int i;
1795
1796        data__for_each_file(i, d) {
1797
1798                /*
1799                 * Baseline or compute realted columns:
1800                 *
1801                 *   PERF_HPP_DIFF__BASELINE
1802                 *   PERF_HPP_DIFF__DELTA
1803                 *   PERF_HPP_DIFF__RATIO
1804                 *   PERF_HPP_DIFF__WEIGHTED_DIFF
1805                 *   PERF_HPP_DIFF__CYCLES
1806                 */
1807                data__hpp_register(d, i ? compute_2_hpp[compute] :
1808                                          PERF_HPP_DIFF__BASELINE);
1809
1810                if (cycles_hist && i)
1811                        data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1812
1813                /*
1814                 * And the rest:
1815                 *
1816                 * PERF_HPP_DIFF__FORMULA
1817                 * PERF_HPP_DIFF__PERIOD
1818                 * PERF_HPP_DIFF__PERIOD_BASELINE
1819                 */
1820                if (show_formula && i)
1821                        data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1822
1823                if (show_period)
1824                        data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1825                                                  PERF_HPP_DIFF__PERIOD_BASELINE);
1826        }
1827
1828        if (!sort_compute)
1829                return 0;
1830
1831        /*
1832         * Prepend an fmt to sort on columns at 'sort_compute' first.
1833         * This fmt is added only to the sort list but not to the
1834         * output fields list.
1835         *
1836         * Note that this column (data) can be compared twice - one
1837         * for this 'sort_compute' fmt and another for the normal
1838         * diff_hpp_fmt.  But it shouldn't a problem as most entries
1839         * will be sorted out by first try or baseline and comparing
1840         * is not a costly operation.
1841         */
1842        fmt = zalloc(sizeof(*fmt));
1843        if (fmt == NULL) {
1844                pr_err("Memory allocation failed\n");
1845                return -1;
1846        }
1847
1848        fmt->cmp      = hist_entry__cmp_nop;
1849        fmt->collapse = hist_entry__cmp_nop;
1850
1851        switch (compute) {
1852        case COMPUTE_DELTA:
1853                fmt->sort = hist_entry__cmp_delta_idx;
1854                break;
1855        case COMPUTE_RATIO:
1856                fmt->sort = hist_entry__cmp_ratio_idx;
1857                break;
1858        case COMPUTE_WEIGHTED_DIFF:
1859                fmt->sort = hist_entry__cmp_wdiff_idx;
1860                break;
1861        case COMPUTE_DELTA_ABS:
1862                fmt->sort = hist_entry__cmp_delta_abs_idx;
1863                break;
1864        case COMPUTE_CYCLES:
1865                /*
1866                 * Should set since 'fmt->sort' is called without
1867                 * checking valid during sorting
1868                 */
1869                fmt->sort = hist_entry__cmp_nop;
1870                break;
1871        default:
1872                BUG_ON(1);
1873        }
1874
1875        perf_hpp__prepend_sort_field(fmt);
1876        return 0;
1877}
1878
1879static int data_init(int argc, const char **argv)
1880{
1881        struct data__file *d;
1882        static const char *defaults[] = {
1883                "perf.data.old",
1884                "perf.data",
1885        };
1886        bool use_default = true;
1887        int i;
1888
1889        data__files_cnt = 2;
1890
1891        if (argc) {
1892                if (argc == 1)
1893                        defaults[1] = argv[0];
1894                else {
1895                        data__files_cnt = argc;
1896                        use_default = false;
1897                }
1898        } else if (perf_guest) {
1899                defaults[0] = "perf.data.host";
1900                defaults[1] = "perf.data.guest";
1901        }
1902
1903        if (sort_compute >= (unsigned int) data__files_cnt) {
1904                pr_err("Order option out of limit.\n");
1905                return -EINVAL;
1906        }
1907
1908        data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1909        if (!data__files)
1910                return -ENOMEM;
1911
1912        data__for_each_file(i, d) {
1913                struct perf_data *data = &d->data;
1914
1915                data->path  = use_default ? defaults[i] : argv[i];
1916                data->mode  = PERF_DATA_MODE_READ,
1917                data->force = force,
1918
1919                d->idx  = i;
1920        }
1921
1922        return 0;
1923}
1924
1925static int diff__config(const char *var, const char *value,
1926                        void *cb __maybe_unused)
1927{
1928        if (!strcmp(var, "diff.order")) {
1929                int ret;
1930                if (perf_config_int(&ret, var, value) < 0)
1931                        return -1;
1932                sort_compute = ret;
1933                return 0;
1934        }
1935        if (!strcmp(var, "diff.compute")) {
1936                if (!strcmp(value, "delta")) {
1937                        compute = COMPUTE_DELTA;
1938                } else if (!strcmp(value, "delta-abs")) {
1939                        compute = COMPUTE_DELTA_ABS;
1940                } else if (!strcmp(value, "ratio")) {
1941                        compute = COMPUTE_RATIO;
1942                } else if (!strcmp(value, "wdiff")) {
1943                        compute = COMPUTE_WEIGHTED_DIFF;
1944                } else {
1945                        pr_err("Invalid compute method: %s\n", value);
1946                        return -1;
1947                }
1948        }
1949
1950        return 0;
1951}
1952
1953int cmd_diff(int argc, const char **argv)
1954{
1955        int ret = hists__init();
1956
1957        if (ret < 0)
1958                return ret;
1959
1960        perf_config(diff__config, NULL);
1961
1962        argc = parse_options(argc, argv, options, diff_usage, 0);
1963
1964        if (quiet)
1965                perf_quiet_option();
1966
1967        if (cycles_hist && (compute != COMPUTE_CYCLES))
1968                usage_with_options(diff_usage, options);
1969
1970        if (pdiff.stream)
1971                compute = COMPUTE_STREAM;
1972
1973        symbol__annotation_init();
1974
1975        if (symbol__init(NULL) < 0)
1976                return -1;
1977
1978        if (data_init(argc, argv) < 0)
1979                return -1;
1980
1981        if (check_file_brstack() < 0)
1982                return -1;
1983
1984        if ((compute == COMPUTE_CYCLES || compute == COMPUTE_STREAM)
1985            && !pdiff.has_br_stack) {
1986                return -1;
1987        }
1988
1989        if (compute == COMPUTE_STREAM) {
1990                symbol_conf.show_branchflag_count = true;
1991                symbol_conf.disable_add2line_warn = true;
1992                callchain_param.mode = CHAIN_FLAT;
1993                callchain_param.key = CCKEY_SRCLINE;
1994                callchain_param.branch_callstack = 1;
1995                symbol_conf.use_callchain = true;
1996                callchain_register_param(&callchain_param);
1997                sort_order = "srcline,symbol,dso";
1998        } else {
1999                if (ui_init() < 0)
2000                        return -1;
2001
2002                sort__mode = SORT_MODE__DIFF;
2003        }
2004
2005        if (setup_sorting(NULL) < 0)
2006                usage_with_options(diff_usage, options);
2007
2008        setup_pager();
2009
2010        sort__setup_elide(NULL);
2011
2012        return __cmd_diff();
2013}
2014