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
  10#include "util/debug.h"
  11#include "util/event.h"
  12#include "util/hist.h"
  13#include "util/evsel.h"
  14#include "util/evlist.h"
  15#include "util/session.h"
  16#include "util/tool.h"
  17#include "util/sort.h"
  18#include "util/srcline.h"
  19#include "util/symbol.h"
  20#include "util/data.h"
  21#include "util/config.h"
  22#include "util/time-utils.h"
  23#include "util/annotate.h"
  24#include "util/map.h"
  25#include "util/spark.h"
  26#include "util/block-info.h"
  27#include "util/stream.h"
  28#include "util/util.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	addr_location__init(&al);
 413	if (machine__resolve(machine, &al, sample) < 0) {
 414		pr_warning("problem processing %d event, skipping it.\n",
 415			   event->header.type);
 416		ret = -1;
 417		goto out;
 418	}
 419
 420	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
 421		ret = 0;
 422		goto out;
 423	}
 424
 425	switch (compute) {
 426	case COMPUTE_CYCLES:
 
 
 
 
 
 
 427		if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
 428					  NULL, NULL, NULL, sample, true)) {
 429			pr_warning("problem incrementing symbol period, "
 430				   "skipping event\n");
 431			goto out;
 432		}
 433
 434		hist__account_cycles(sample->branch_stack, &al, sample, false,
 435				     NULL);
 436		break;
 437
 438	case COMPUTE_STREAM:
 439		if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,
 440					 NULL)) {
 441			pr_debug("problem adding hist entry, skipping event\n");
 442			goto out;
 443		}
 444		break;
 445
 446	default:
 447		if (!hists__add_entry(hists, &al, NULL, NULL, NULL, NULL, sample,
 448				      true)) {
 449			pr_warning("problem incrementing symbol period, "
 450				   "skipping event\n");
 451			goto out;
 452		}
 453	}
 454
 455	/*
 456	 * The total_period is updated here before going to the output
 457	 * tree since normally only the baseline hists will call
 458	 * hists__output_resort() and precompute needs the total
 459	 * period in order to sort entries by percentage delta.
 460	 */
 461	hists->stats.total_period += sample->period;
 462	if (!al.filtered)
 463		hists->stats.total_non_filtered_period += sample->period;
 464	ret = 0;
 465out:
 466	addr_location__exit(&al);
 467	return ret;
 468}
 469
 470static struct perf_diff pdiff = {
 471	.tool = {
 472		.sample	= diff__process_sample_event,
 473		.mmap	= perf_event__process_mmap,
 474		.mmap2	= perf_event__process_mmap2,
 475		.comm	= perf_event__process_comm,
 476		.exit	= perf_event__process_exit,
 477		.fork	= perf_event__process_fork,
 478		.lost	= perf_event__process_lost,
 479		.namespaces = perf_event__process_namespaces,
 480		.cgroup = perf_event__process_cgroup,
 481		.ordered_events = true,
 482		.ordering_requires_timestamps = true,
 483	},
 484};
 485
 486static struct evsel *evsel_match(struct evsel *evsel,
 487				      struct evlist *evlist)
 488{
 489	struct evsel *e;
 490
 491	evlist__for_each_entry(evlist, e) {
 492		if (evsel__match2(evsel, e))
 493			return e;
 494	}
 495
 496	return NULL;
 497}
 498
 499static void evlist__collapse_resort(struct evlist *evlist)
 500{
 501	struct evsel *evsel;
 502
 503	evlist__for_each_entry(evlist, evsel) {
 504		struct hists *hists = evsel__hists(evsel);
 505
 506		hists__collapse_resort(hists, NULL);
 507	}
 508}
 509
 510static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt)
 511{
 512	struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);
 513	void *ptr = dfmt - dfmt->idx;
 514	struct data__file *d = container_of(ptr, struct data__file, fmt);
 515
 516	return d;
 517}
 518
 519static struct hist_entry*
 520get_pair_data(struct hist_entry *he, struct data__file *d)
 521{
 522	if (hist_entry__has_pairs(he)) {
 523		struct hist_entry *pair;
 524
 525		list_for_each_entry(pair, &he->pairs.head, pairs.node)
 526			if (pair->hists == d->hists)
 527				return pair;
 528	}
 529
 530	return NULL;
 531}
 532
 533static struct hist_entry*
 534get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
 535{
 536	struct data__file *d = fmt_to_data_file(&dfmt->fmt);
 537
 538	return get_pair_data(he, d);
 539}
 540
 541static void hists__baseline_only(struct hists *hists)
 542{
 543	struct rb_root_cached *root;
 544	struct rb_node *next;
 545
 546	if (hists__has(hists, need_collapse))
 547		root = &hists->entries_collapsed;
 548	else
 549		root = hists->entries_in;
 550
 551	next = rb_first_cached(root);
 552	while (next != NULL) {
 553		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 554
 555		next = rb_next(&he->rb_node_in);
 556		if (!hist_entry__next_pair(he)) {
 557			rb_erase_cached(&he->rb_node_in, root);
 558			hist_entry__delete(he);
 559		}
 560	}
 561}
 562
 563static int64_t block_cycles_diff_cmp(struct hist_entry *left,
 564				     struct hist_entry *right)
 565{
 566	bool pairs_left  = hist_entry__has_pairs(left);
 567	bool pairs_right = hist_entry__has_pairs(right);
 568	s64 l, r;
 569
 570	if (!pairs_left && !pairs_right)
 571		return 0;
 572
 573	l = llabs(left->diff.cycles);
 574	r = llabs(right->diff.cycles);
 575	return r - l;
 576}
 577
 578static int64_t block_sort(struct perf_hpp_fmt *fmt __maybe_unused,
 579			  struct hist_entry *left, struct hist_entry *right)
 580{
 581	return block_cycles_diff_cmp(right, left);
 582}
 583
 584static void init_block_hist(struct block_hist *bh)
 585{
 586	__hists__init(&bh->block_hists, &bh->block_list);
 587	perf_hpp_list__init(&bh->block_list);
 588
 589	INIT_LIST_HEAD(&bh->block_fmt.list);
 590	INIT_LIST_HEAD(&bh->block_fmt.sort_list);
 591	bh->block_fmt.cmp = block_info__cmp;
 592	bh->block_fmt.sort = block_sort;
 593	perf_hpp_list__register_sort_field(&bh->block_list,
 594					   &bh->block_fmt);
 595	bh->valid = true;
 596}
 597
 598static struct hist_entry *get_block_pair(struct hist_entry *he,
 599					 struct hists *hists_pair)
 600{
 601	struct rb_root_cached *root = hists_pair->entries_in;
 602	struct rb_node *next = rb_first_cached(root);
 603	int64_t cmp;
 604
 605	while (next != NULL) {
 606		struct hist_entry *he_pair = rb_entry(next, struct hist_entry,
 607						      rb_node_in);
 608
 609		next = rb_next(&he_pair->rb_node_in);
 610
 611		cmp = __block_info__cmp(he_pair, he);
 612		if (!cmp)
 613			return he_pair;
 614	}
 615
 616	return NULL;
 617}
 618
 619static void init_spark_values(unsigned long *svals, int num)
 620{
 621	for (int i = 0; i < num; i++)
 622		svals[i] = 0;
 623}
 624
 625static void update_spark_value(unsigned long *svals, int num,
 626			       struct stats *stats, u64 val)
 627{
 628	int n = stats->n;
 629
 630	if (n < num)
 631		svals[n] = val;
 632}
 633
 634static void compute_cycles_diff(struct hist_entry *he,
 635				struct hist_entry *pair)
 636{
 637	pair->diff.computed = true;
 638	if (pair->block_info->num && he->block_info->num) {
 639		pair->diff.cycles =
 640			pair->block_info->cycles_aggr / pair->block_info->num_aggr -
 641			he->block_info->cycles_aggr / he->block_info->num_aggr;
 642
 643		if (!cycles_hist)
 644			return;
 645
 646		init_stats(&pair->diff.stats);
 647		init_spark_values(pair->diff.svals, NUM_SPARKS);
 648
 649		for (int i = 0; i < pair->block_info->num; i++) {
 650			u64 val;
 651
 652			if (i >= he->block_info->num || i >= NUM_SPARKS)
 653				break;
 654
 655			val = llabs(pair->block_info->cycles_spark[i] -
 656				     he->block_info->cycles_spark[i]);
 657
 658			update_spark_value(pair->diff.svals, NUM_SPARKS,
 659					   &pair->diff.stats, val);
 660			update_stats(&pair->diff.stats, val);
 661		}
 662	}
 663}
 664
 665static void block_hists_match(struct hists *hists_base,
 666			      struct hists *hists_pair)
 667{
 668	struct rb_root_cached *root = hists_base->entries_in;
 669	struct rb_node *next = rb_first_cached(root);
 670
 671	while (next != NULL) {
 672		struct hist_entry *he = rb_entry(next, struct hist_entry,
 673						 rb_node_in);
 674		struct hist_entry *pair = get_block_pair(he, hists_pair);
 675
 676		next = rb_next(&he->rb_node_in);
 677
 678		if (pair) {
 679			hist_entry__add_pair(pair, he);
 680			compute_cycles_diff(he, pair);
 681		}
 682	}
 683}
 684
 685static void hists__precompute(struct hists *hists)
 686{
 687	struct rb_root_cached *root;
 688	struct rb_node *next;
 689
 690	if (hists__has(hists, need_collapse))
 691		root = &hists->entries_collapsed;
 692	else
 693		root = hists->entries_in;
 694
 695	next = rb_first_cached(root);
 696	while (next != NULL) {
 697		struct block_hist *bh, *pair_bh;
 698		struct hist_entry *he, *pair;
 699		struct data__file *d;
 700		int i;
 701
 702		he   = rb_entry(next, struct hist_entry, rb_node_in);
 703		next = rb_next(&he->rb_node_in);
 704
 705		if (compute == COMPUTE_CYCLES) {
 706			bh = container_of(he, struct block_hist, he);
 707			init_block_hist(bh);
 708			block_info__process_sym(he, bh, NULL, 0);
 709		}
 710
 711		data__for_each_file_new(i, d) {
 712			pair = get_pair_data(he, d);
 713			if (!pair)
 714				continue;
 715
 716			switch (compute) {
 717			case COMPUTE_DELTA:
 718			case COMPUTE_DELTA_ABS:
 719				compute_delta(he, pair);
 720				break;
 721			case COMPUTE_RATIO:
 722				compute_ratio(he, pair);
 723				break;
 724			case COMPUTE_WEIGHTED_DIFF:
 725				compute_wdiff(he, pair);
 726				break;
 727			case COMPUTE_CYCLES:
 728				pair_bh = container_of(pair, struct block_hist,
 729						       he);
 730				init_block_hist(pair_bh);
 731				block_info__process_sym(pair, pair_bh, NULL, 0);
 732
 733				bh = container_of(he, struct block_hist, he);
 734
 735				if (bh->valid && pair_bh->valid) {
 736					block_hists_match(&bh->block_hists,
 737							  &pair_bh->block_hists);
 738					hists__output_resort(&pair_bh->block_hists,
 739							     NULL);
 740				}
 741				break;
 742			default:
 743				BUG_ON(1);
 744			}
 745		}
 746	}
 747}
 748
 749static int64_t cmp_doubles(double l, double r)
 750{
 751	if (l > r)
 752		return -1;
 753	else if (l < r)
 754		return 1;
 755	else
 756		return 0;
 757}
 758
 759static int64_t
 760__hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 761			int c)
 762{
 763	switch (c) {
 764	case COMPUTE_DELTA:
 765	{
 766		double l = left->diff.period_ratio_delta;
 767		double r = right->diff.period_ratio_delta;
 768
 769		return cmp_doubles(l, r);
 770	}
 771	case COMPUTE_DELTA_ABS:
 772	{
 773		double l = fabs(left->diff.period_ratio_delta);
 774		double r = fabs(right->diff.period_ratio_delta);
 775
 776		return cmp_doubles(l, r);
 777	}
 778	case COMPUTE_RATIO:
 779	{
 780		double l = left->diff.period_ratio;
 781		double r = right->diff.period_ratio;
 782
 783		return cmp_doubles(l, r);
 784	}
 785	case COMPUTE_WEIGHTED_DIFF:
 786	{
 787		s64 l = left->diff.wdiff;
 788		s64 r = right->diff.wdiff;
 789
 790		return r - l;
 791	}
 792	default:
 793		BUG_ON(1);
 794	}
 795
 796	return 0;
 797}
 798
 799static int64_t
 800hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
 801			int c, int sort_idx)
 802{
 803	bool pairs_left  = hist_entry__has_pairs(left);
 804	bool pairs_right = hist_entry__has_pairs(right);
 805	struct hist_entry *p_right, *p_left;
 806
 807	if (!pairs_left && !pairs_right)
 808		return 0;
 809
 810	if (!pairs_left || !pairs_right)
 811		return pairs_left ? -1 : 1;
 812
 813	p_left  = get_pair_data(left,  &data__files[sort_idx]);
 814	p_right = get_pair_data(right, &data__files[sort_idx]);
 815
 816	if (!p_left && !p_right)
 817		return 0;
 818
 819	if (!p_left || !p_right)
 820		return p_left ? -1 : 1;
 821
 822	/*
 823	 * We have 2 entries of same kind, let's
 824	 * make the data comparison.
 825	 */
 826	return __hist_entry__cmp_compute(p_left, p_right, c);
 827}
 828
 829static int64_t
 830hist_entry__cmp_compute_idx(struct hist_entry *left, struct hist_entry *right,
 831			    int c, int sort_idx)
 832{
 833	struct hist_entry *p_right, *p_left;
 834
 835	p_left  = get_pair_data(left,  &data__files[sort_idx]);
 836	p_right = get_pair_data(right, &data__files[sort_idx]);
 837
 838	if (!p_left && !p_right)
 839		return 0;
 840
 841	if (!p_left || !p_right)
 842		return p_left ? -1 : 1;
 843
 844	if (c != COMPUTE_DELTA && c != COMPUTE_DELTA_ABS) {
 845		/*
 846		 * The delta can be computed without the baseline, but
 847		 * others are not.  Put those entries which have no
 848		 * values below.
 849		 */
 850		if (left->dummy && right->dummy)
 851			return 0;
 852
 853		if (left->dummy || right->dummy)
 854			return left->dummy ? 1 : -1;
 855	}
 856
 857	return __hist_entry__cmp_compute(p_left, p_right, c);
 858}
 859
 860static int64_t
 861hist_entry__cmp_nop(struct perf_hpp_fmt *fmt __maybe_unused,
 862		    struct hist_entry *left __maybe_unused,
 863		    struct hist_entry *right __maybe_unused)
 864{
 865	return 0;
 866}
 867
 868static int64_t
 869hist_entry__cmp_baseline(struct perf_hpp_fmt *fmt __maybe_unused,
 870			 struct hist_entry *left, struct hist_entry *right)
 871{
 872	if (left->stat.period == right->stat.period)
 873		return 0;
 874	return left->stat.period > right->stat.period ? 1 : -1;
 875}
 876
 877static int64_t
 878hist_entry__cmp_delta(struct perf_hpp_fmt *fmt,
 879		      struct hist_entry *left, struct hist_entry *right)
 880{
 881	struct data__file *d = fmt_to_data_file(fmt);
 882
 883	return hist_entry__cmp_compute(right, left, COMPUTE_DELTA, d->idx);
 884}
 885
 886static int64_t
 887hist_entry__cmp_delta_abs(struct perf_hpp_fmt *fmt,
 888		      struct hist_entry *left, struct hist_entry *right)
 889{
 890	struct data__file *d = fmt_to_data_file(fmt);
 891
 892	return hist_entry__cmp_compute(right, left, COMPUTE_DELTA_ABS, d->idx);
 893}
 894
 895static int64_t
 896hist_entry__cmp_ratio(struct perf_hpp_fmt *fmt,
 897		      struct hist_entry *left, struct hist_entry *right)
 898{
 899	struct data__file *d = fmt_to_data_file(fmt);
 900
 901	return hist_entry__cmp_compute(right, left, COMPUTE_RATIO, d->idx);
 902}
 903
 904static int64_t
 905hist_entry__cmp_wdiff(struct perf_hpp_fmt *fmt,
 906		      struct hist_entry *left, struct hist_entry *right)
 907{
 908	struct data__file *d = fmt_to_data_file(fmt);
 909
 910	return hist_entry__cmp_compute(right, left, COMPUTE_WEIGHTED_DIFF, d->idx);
 911}
 912
 913static int64_t
 914hist_entry__cmp_delta_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 915			  struct hist_entry *left, struct hist_entry *right)
 916{
 917	return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA,
 918					   sort_compute);
 919}
 920
 921static int64_t
 922hist_entry__cmp_delta_abs_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 923			      struct hist_entry *left, struct hist_entry *right)
 924{
 925	return hist_entry__cmp_compute_idx(right, left, COMPUTE_DELTA_ABS,
 926					   sort_compute);
 927}
 928
 929static int64_t
 930hist_entry__cmp_ratio_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 931			  struct hist_entry *left, struct hist_entry *right)
 932{
 933	return hist_entry__cmp_compute_idx(right, left, COMPUTE_RATIO,
 934					   sort_compute);
 935}
 936
 937static int64_t
 938hist_entry__cmp_wdiff_idx(struct perf_hpp_fmt *fmt __maybe_unused,
 939			  struct hist_entry *left, struct hist_entry *right)
 940{
 941	return hist_entry__cmp_compute_idx(right, left, COMPUTE_WEIGHTED_DIFF,
 942					   sort_compute);
 943}
 944
 945static void hists__process(struct hists *hists)
 946{
 947	if (show_baseline_only)
 948		hists__baseline_only(hists);
 949
 950	hists__precompute(hists);
 951	hists__output_resort(hists, NULL);
 952
 953	if (compute == COMPUTE_CYCLES)
 954		symbol_conf.report_block = true;
 955
 956	hists__fprintf(hists, !quiet, 0, 0, 0, stdout,
 957		       !symbol_conf.use_callchain);
 958}
 959
 960static void data__fprintf(void)
 961{
 962	struct data__file *d;
 963	int i;
 964
 965	fprintf(stdout, "# Data files:\n");
 966
 967	data__for_each_file(i, d)
 968		fprintf(stdout, "#  [%d] %s %s\n",
 969			d->idx, d->data.path,
 970			!d->idx ? "(Baseline)" : "");
 971
 972	fprintf(stdout, "#\n");
 973}
 974
 975static void data_process(void)
 976{
 977	struct evlist *evlist_base = data__files[0].session->evlist;
 978	struct evsel *evsel_base;
 979	bool first = true;
 980
 981	evlist__for_each_entry(evlist_base, evsel_base) {
 982		struct hists *hists_base = evsel__hists(evsel_base);
 983		struct data__file *d;
 984		int i;
 985
 986		data__for_each_file_new(i, d) {
 987			struct evlist *evlist = d->session->evlist;
 988			struct evsel *evsel;
 989			struct hists *hists;
 990
 991			evsel = evsel_match(evsel_base, evlist);
 992			if (!evsel)
 993				continue;
 994
 995			hists = evsel__hists(evsel);
 996			d->hists = hists;
 997
 998			hists__match(hists_base, hists);
 999
1000			if (!show_baseline_only)
1001				hists__link(hists_base, hists);
1002		}
1003
1004		if (!quiet) {
1005			fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
1006				evsel__name(evsel_base));
1007		}
1008
1009		first = false;
1010
1011		if (verbose > 0 || ((data__files_cnt > 2) && !quiet))
1012			data__fprintf();
1013
1014		/* Don't sort callchain for perf diff */
1015		evsel__reset_sample_bit(evsel_base, CALLCHAIN);
1016
1017		hists__process(hists_base);
1018	}
1019}
1020
1021static int process_base_stream(struct data__file *data_base,
1022			       struct data__file *data_pair,
1023			       const char *title __maybe_unused)
1024{
1025	struct evlist *evlist_base = data_base->session->evlist;
1026	struct evlist *evlist_pair = data_pair->session->evlist;
1027	struct evsel *evsel_base, *evsel_pair;
1028	struct evsel_streams *es_base, *es_pair;
1029
1030	evlist__for_each_entry(evlist_base, evsel_base) {
1031		evsel_pair = evsel_match(evsel_base, evlist_pair);
1032		if (!evsel_pair)
1033			continue;
1034
1035		es_base = evsel_streams__entry(data_base->evlist_streams,
1036					       evsel_base->core.idx);
1037		if (!es_base)
1038			return -1;
1039
1040		es_pair = evsel_streams__entry(data_pair->evlist_streams,
1041					       evsel_pair->core.idx);
1042		if (!es_pair)
1043			return -1;
1044
1045		evsel_streams__match(es_base, es_pair);
1046		evsel_streams__report(es_base, es_pair);
1047	}
1048
1049	return 0;
1050}
1051
1052static void stream_process(void)
1053{
1054	/*
1055	 * Stream comparison only supports two data files.
1056	 * perf.data.old and perf.data. data__files[0] is perf.data.old,
1057	 * data__files[1] is perf.data.
1058	 */
1059	process_base_stream(&data__files[0], &data__files[1],
1060			    "# Output based on old perf data:\n#\n");
1061}
1062
1063static void data__free(struct data__file *d)
1064{
1065	int col;
1066
1067	if (d->evlist_streams)
1068		evlist_streams__delete(d->evlist_streams);
1069
1070	for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
1071		struct diff_hpp_fmt *fmt = &d->fmt[col];
1072
1073		zfree(&fmt->header);
1074	}
1075}
1076
1077static int abstime_str_dup(char **pstr)
1078{
1079	char *str = NULL;
1080
1081	if (pdiff.time_str && strchr(pdiff.time_str, ':')) {
1082		str = strdup(pdiff.time_str);
1083		if (!str)
1084			return -ENOMEM;
1085	}
1086
1087	*pstr = str;
1088	return 0;
1089}
1090
1091static int parse_absolute_time(struct data__file *d, char **pstr)
1092{
1093	char *p = *pstr;
1094	int ret;
1095
1096	/*
1097	 * Absolute timestamp for one file has the format: a.b,c.d
1098	 * For multiple files, the format is: a.b,c.d:a.b,c.d
1099	 */
1100	p = strchr(*pstr, ':');
1101	if (p) {
1102		if (p == *pstr) {
1103			pr_err("Invalid time string\n");
1104			return -EINVAL;
1105		}
1106
1107		*p = 0;
1108		p++;
1109		if (*p == 0) {
1110			pr_err("Invalid time string\n");
1111			return -EINVAL;
1112		}
1113	}
1114
1115	ret = perf_time__parse_for_ranges(*pstr, d->session,
1116					  &pdiff.ptime_range,
1117					  &pdiff.range_size,
1118					  &pdiff.range_num);
1119	if (ret < 0)
1120		return ret;
1121
1122	if (!p || *p == 0)
1123		*pstr = NULL;
1124	else
1125		*pstr = p;
1126
1127	return ret;
1128}
1129
1130static int parse_percent_time(struct data__file *d)
1131{
1132	int ret;
1133
1134	ret = perf_time__parse_for_ranges(pdiff.time_str, d->session,
1135					  &pdiff.ptime_range,
1136					  &pdiff.range_size,
1137					  &pdiff.range_num);
1138	return ret;
1139}
1140
1141static int parse_time_str(struct data__file *d, char *abstime_ostr,
1142			   char **pabstime_tmp)
1143{
1144	int ret = 0;
1145
1146	if (abstime_ostr)
1147		ret = parse_absolute_time(d, pabstime_tmp);
1148	else if (pdiff.time_str)
1149		ret = parse_percent_time(d);
1150
1151	return ret;
1152}
1153
1154static int check_file_brstack(void)
1155{
1156	struct data__file *d;
1157	bool has_br_stack;
1158	int i;
1159
1160	data__for_each_file(i, d) {
1161		d->session = perf_session__new(&d->data, &pdiff.tool);
1162		if (IS_ERR(d->session)) {
1163			pr_err("Failed to open %s\n", d->data.path);
1164			return PTR_ERR(d->session);
1165		}
1166
1167		has_br_stack = perf_header__has_feat(&d->session->header,
1168						     HEADER_BRANCH_STACK);
1169		perf_session__delete(d->session);
1170		if (!has_br_stack)
1171			return 0;
1172	}
1173
1174	/* Set only all files having branch stacks */
1175	pdiff.has_br_stack = true;
1176	return 0;
1177}
1178
1179static int __cmd_diff(void)
1180{
1181	struct data__file *d;
1182	int ret, i;
1183	char *abstime_ostr, *abstime_tmp;
1184
1185	ret = abstime_str_dup(&abstime_ostr);
1186	if (ret)
1187		return ret;
1188
1189	abstime_tmp = abstime_ostr;
1190	ret = -EINVAL;
1191
1192	data__for_each_file(i, d) {
1193		d->session = perf_session__new(&d->data, &pdiff.tool);
1194		if (IS_ERR(d->session)) {
1195			ret = PTR_ERR(d->session);
1196			pr_err("Failed to open %s\n", d->data.path);
1197			goto out_delete;
1198		}
1199
1200		if (pdiff.time_str) {
1201			ret = parse_time_str(d, abstime_ostr, &abstime_tmp);
1202			if (ret < 0)
1203				goto out_delete;
1204		}
1205
1206		if (cpu_list) {
1207			ret = perf_session__cpu_bitmap(d->session, cpu_list,
1208						       cpu_bitmap);
1209			if (ret < 0)
1210				goto out_delete;
1211		}
1212
1213		ret = perf_session__process_events(d->session);
1214		if (ret) {
1215			pr_err("Failed to process %s\n", d->data.path);
1216			goto out_delete;
1217		}
1218
1219		evlist__collapse_resort(d->session->evlist);
1220
1221		if (pdiff.ptime_range)
1222			zfree(&pdiff.ptime_range);
1223
1224		if (compute == COMPUTE_STREAM) {
1225			d->evlist_streams = evlist__create_streams(
1226						d->session->evlist, 5);
1227			if (!d->evlist_streams) {
1228				ret = -ENOMEM;
1229				goto out_delete;
1230			}
1231		}
1232	}
1233
1234	if (compute == COMPUTE_STREAM)
1235		stream_process();
1236	else
1237		data_process();
1238
1239 out_delete:
1240	data__for_each_file(i, d) {
1241		if (!IS_ERR(d->session))
1242			perf_session__delete(d->session);
1243		data__free(d);
1244	}
1245
1246	free(data__files);
1247
1248	if (pdiff.ptime_range)
1249		zfree(&pdiff.ptime_range);
1250
1251	if (abstime_ostr)
1252		free(abstime_ostr);
1253
1254	return ret;
1255}
1256
1257static const char * const diff_usage[] = {
1258	"perf diff [<options>] [old_file] [new_file]",
1259	NULL,
1260};
1261
1262static const struct option options[] = {
1263	OPT_INCR('v', "verbose", &verbose,
1264		    "be more verbose (show symbol address, etc)"),
1265	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any warnings or messages"),
1266	OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
1267		    "Show only items with match in baseline"),
1268	OPT_CALLBACK('c', "compute", &compute,
1269		     "delta,delta-abs,ratio,wdiff:w1,w2 (default delta-abs),cycles",
1270		     "Entries differential computation selection",
1271		     setup_compute),
1272	OPT_BOOLEAN('p', "period", &show_period,
1273		    "Show period values."),
1274	OPT_BOOLEAN('F', "formula", &show_formula,
1275		    "Show formula."),
1276	OPT_BOOLEAN(0, "cycles-hist", &cycles_hist,
1277		    "Show cycles histogram and standard deviation "
1278		    "- WARNING: use only with -c cycles."),
1279	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1280		    "dump raw trace in ASCII"),
1281	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
1282	OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1283		   "file", "kallsyms pathname"),
1284	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
1285		    "load module symbols - WARNING: use only with -k and LIVE kernel"),
1286	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1287		   "only consider symbols in these dsos"),
1288	OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1289		   "only consider symbols in these comms"),
1290	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1291		   "only consider these symbols"),
1292	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1293		   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1294		   " Please refer the man page for the complete list."),
1295	OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
1296		   "separator for columns, no spaces will be added between "
1297		   "columns '.' is reserved."),
1298	OPT_CALLBACK(0, "symfs", NULL, "directory",
1299		     "Look for files with symbols relative to this directory",
1300		     symbol__config_symfs),
1301	OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
1302	OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1303		     "How to display percentage of filtered entries", parse_filter_percentage),
1304	OPT_STRING(0, "time", &pdiff.time_str, "str",
1305		   "Time span (time percent or absolute timestamp)"),
1306	OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
1307	OPT_STRING(0, "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
1308		   "only consider symbols in these pids"),
1309	OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
1310		   "only consider symbols in these tids"),
1311	OPT_BOOLEAN(0, "stream", &pdiff.stream,
1312		    "Enable hot streams comparison."),
1313	OPT_END()
1314};
1315
1316static double baseline_percent(struct hist_entry *he)
1317{
1318	u64 total = hists__total_period(he->hists);
1319
1320	return 100.0 * he->stat.period / total;
1321}
1322
1323static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
1324			       struct perf_hpp *hpp, struct hist_entry *he)
1325{
1326	struct diff_hpp_fmt *dfmt =
1327		container_of(fmt, struct diff_hpp_fmt, fmt);
1328	double percent = baseline_percent(he);
1329	char pfmt[20] = " ";
1330
1331	if (!he->dummy) {
1332		scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
1333		return percent_color_snprintf(hpp->buf, hpp->size,
1334					      pfmt, percent);
1335	} else
1336		return scnprintf(hpp->buf, hpp->size, "%*s",
1337				 dfmt->header_width, pfmt);
1338}
1339
1340static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
1341{
1342	double percent = baseline_percent(he);
1343	const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
1344	int ret = 0;
1345
1346	if (!he->dummy)
1347		ret = scnprintf(buf, size, fmt, percent);
1348
1349	return ret;
1350}
1351
1352static int cycles_printf(struct hist_entry *he, struct hist_entry *pair,
1353			 struct perf_hpp *hpp, int width)
1354{
1355	struct block_hist *bh = container_of(he, struct block_hist, he);
1356	struct block_hist *bh_pair = container_of(pair, struct block_hist, he);
1357	struct hist_entry *block_he;
1358	struct block_info *bi;
1359	char buf[128];
1360	char *start_line, *end_line;
1361
1362	block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1363	if (!block_he) {
1364		hpp->skip = true;
1365		return 0;
1366	}
1367
1368	/*
1369	 * Avoid printing the warning "addr2line_init failed for ..."
1370	 */
1371	symbol_conf.disable_add2line_warn = true;
1372
1373	bi = block_he->block_info;
1374
1375	start_line = map__srcline(he->ms.map, bi->sym->start + bi->start,
1376				  he->ms.sym);
1377
1378	end_line = map__srcline(he->ms.map, bi->sym->start + bi->end,
1379				he->ms.sym);
1380
1381	if (start_line != SRCLINE_UNKNOWN &&
1382	    end_line != SRCLINE_UNKNOWN) {
1383		scnprintf(buf, sizeof(buf), "[%s -> %s] %4ld",
1384			  start_line, end_line, block_he->diff.cycles);
1385	} else {
1386		scnprintf(buf, sizeof(buf), "[%7lx -> %7lx] %4ld",
1387			  bi->start, bi->end, block_he->diff.cycles);
1388	}
1389
1390	zfree_srcline(&start_line);
1391	zfree_srcline(&end_line);
1392
1393	return scnprintf(hpp->buf, hpp->size, "%*s", width, buf);
1394}
1395
1396static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
1397				struct perf_hpp *hpp, struct hist_entry *he,
1398				int comparison_method)
1399{
1400	struct diff_hpp_fmt *dfmt =
1401		container_of(fmt, struct diff_hpp_fmt, fmt);
1402	struct hist_entry *pair = get_pair_fmt(he, dfmt);
1403	double diff;
1404	s64 wdiff;
1405	char pfmt[20] = " ";
1406
1407	if (!pair) {
1408		if (comparison_method == COMPUTE_CYCLES) {
1409			struct block_hist *bh;
1410
1411			bh = container_of(he, struct block_hist, he);
1412			if (bh->block_idx)
1413				hpp->skip = true;
1414		}
1415
1416		goto no_print;
1417	}
1418
1419	switch (comparison_method) {
1420	case COMPUTE_DELTA:
1421		if (pair->diff.computed)
1422			diff = pair->diff.period_ratio_delta;
1423		else
1424			diff = compute_delta(he, pair);
1425
1426		scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
1427		return percent_color_snprintf(hpp->buf, hpp->size,
1428					pfmt, diff);
1429	case COMPUTE_RATIO:
1430		if (he->dummy)
1431			goto dummy_print;
1432		if (pair->diff.computed)
1433			diff = pair->diff.period_ratio;
1434		else
1435			diff = compute_ratio(he, pair);
1436
1437		scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
1438		return value_color_snprintf(hpp->buf, hpp->size,
1439					pfmt, diff);
1440	case COMPUTE_WEIGHTED_DIFF:
1441		if (he->dummy)
1442			goto dummy_print;
1443		if (pair->diff.computed)
1444			wdiff = pair->diff.wdiff;
1445		else
1446			wdiff = compute_wdiff(he, pair);
1447
1448		scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
1449		return color_snprintf(hpp->buf, hpp->size,
1450				get_percent_color(wdiff),
1451				pfmt, wdiff);
1452	case COMPUTE_CYCLES:
1453		return cycles_printf(he, pair, hpp, dfmt->header_width);
1454	default:
1455		BUG_ON(1);
1456	}
1457dummy_print:
1458	return scnprintf(hpp->buf, hpp->size, "%*s",
1459			dfmt->header_width, "N/A");
1460no_print:
1461	return scnprintf(hpp->buf, hpp->size, "%*s",
1462			dfmt->header_width, pfmt);
1463}
1464
1465static int hpp__color_delta(struct perf_hpp_fmt *fmt,
1466			struct perf_hpp *hpp, struct hist_entry *he)
1467{
1468	return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
1469}
1470
1471static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
1472			struct perf_hpp *hpp, struct hist_entry *he)
1473{
1474	return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
1475}
1476
1477static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
1478			struct perf_hpp *hpp, struct hist_entry *he)
1479{
1480	return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
1481}
1482
1483static int hpp__color_cycles(struct perf_hpp_fmt *fmt,
1484			     struct perf_hpp *hpp, struct hist_entry *he)
1485{
1486	return __hpp__color_compare(fmt, hpp, he, COMPUTE_CYCLES);
1487}
1488
1489static int all_zero(unsigned long *vals, int len)
1490{
1491	int i;
1492
1493	for (i = 0; i < len; i++)
1494		if (vals[i] != 0)
1495			return 0;
1496	return 1;
1497}
1498
1499static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
1500{
1501	int printed;
1502
1503	if (n <= 1)
1504		return 0;
1505
1506	if (n > NUM_SPARKS)
1507		n = NUM_SPARKS;
1508	if (all_zero(svals, n))
1509		return 0;
1510
1511	printed = print_spark(bf, size, svals, n);
1512	printed += scnprintf(bf + printed, size - printed, " ");
1513	return printed;
1514}
1515
1516static int hpp__color_cycles_hist(struct perf_hpp_fmt *fmt,
1517			    struct perf_hpp *hpp, struct hist_entry *he)
1518{
1519	struct diff_hpp_fmt *dfmt =
1520		container_of(fmt, struct diff_hpp_fmt, fmt);
1521	struct hist_entry *pair = get_pair_fmt(he, dfmt);
1522	struct block_hist *bh = container_of(he, struct block_hist, he);
1523	struct block_hist *bh_pair;
1524	struct hist_entry *block_he;
1525	char spark[32], buf[128];
1526	double r;
1527	int ret, pad;
1528
1529	if (!pair) {
1530		if (bh->block_idx)
1531			hpp->skip = true;
1532
1533		goto no_print;
1534	}
1535
1536	bh_pair = container_of(pair, struct block_hist, he);
1537
1538	block_he = hists__get_entry(&bh_pair->block_hists, bh->block_idx);
1539	if (!block_he) {
1540		hpp->skip = true;
1541		goto no_print;
1542	}
1543
1544	ret = print_cycles_spark(spark, sizeof(spark), block_he->diff.svals,
1545				 block_he->diff.stats.n);
1546
1547	r = rel_stddev_stats(stddev_stats(&block_he->diff.stats),
1548			     avg_stats(&block_he->diff.stats));
1549
1550	if (ret) {
1551		/*
1552		 * Padding spaces if number of sparks less than NUM_SPARKS
1553		 * otherwise the output is not aligned.
1554		 */
1555		pad = NUM_SPARKS - ((ret - 1) / 3);
1556		scnprintf(buf, sizeof(buf), "%s%5.1f%% %s", "\u00B1", r, spark);
1557		ret = scnprintf(hpp->buf, hpp->size, "%*s",
1558				dfmt->header_width, buf);
1559
1560		if (pad) {
1561			ret += scnprintf(hpp->buf + ret, hpp->size - ret,
1562					 "%-*s", pad, " ");
1563		}
1564
1565		return ret;
1566	}
1567
1568no_print:
1569	return scnprintf(hpp->buf, hpp->size, "%*s",
1570			dfmt->header_width, " ");
1571}
1572
1573static void
1574hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
1575{
1576	switch (idx) {
1577	case PERF_HPP_DIFF__PERIOD_BASELINE:
1578		scnprintf(buf, size, "%" PRIu64, he->stat.period);
1579		break;
1580
1581	default:
1582		break;
1583	}
1584}
1585
1586static void
1587hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
1588		int idx, char *buf, size_t size)
1589{
1590	double diff;
1591	double ratio;
1592	s64 wdiff;
1593
1594	switch (idx) {
1595	case PERF_HPP_DIFF__DELTA:
1596	case PERF_HPP_DIFF__DELTA_ABS:
1597		if (pair->diff.computed)
1598			diff = pair->diff.period_ratio_delta;
1599		else
1600			diff = compute_delta(he, pair);
1601
1602		scnprintf(buf, size, "%+4.2F%%", diff);
1603		break;
1604
1605	case PERF_HPP_DIFF__RATIO:
1606		/* No point for ratio number if we are dummy.. */
1607		if (he->dummy) {
1608			scnprintf(buf, size, "N/A");
1609			break;
1610		}
1611
1612		if (pair->diff.computed)
1613			ratio = pair->diff.period_ratio;
1614		else
1615			ratio = compute_ratio(he, pair);
1616
1617		if (ratio > 0.0)
1618			scnprintf(buf, size, "%14.6F", ratio);
1619		break;
1620
1621	case PERF_HPP_DIFF__WEIGHTED_DIFF:
1622		/* No point for wdiff number if we are dummy.. */
1623		if (he->dummy) {
1624			scnprintf(buf, size, "N/A");
1625			break;
1626		}
1627
1628		if (pair->diff.computed)
1629			wdiff = pair->diff.wdiff;
1630		else
1631			wdiff = compute_wdiff(he, pair);
1632
1633		if (wdiff != 0)
1634			scnprintf(buf, size, "%14ld", wdiff);
1635		break;
1636
1637	case PERF_HPP_DIFF__FORMULA:
1638		formula_fprintf(he, pair, buf, size);
1639		break;
1640
1641	case PERF_HPP_DIFF__PERIOD:
1642		scnprintf(buf, size, "%" PRIu64, pair->stat.period);
1643		break;
1644
1645	default:
1646		BUG_ON(1);
1647	}
1648}
1649
1650static void
1651__hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
1652		    char *buf, size_t size)
1653{
1654	struct hist_entry *pair = get_pair_fmt(he, dfmt);
1655	int idx = dfmt->idx;
1656
1657	/* baseline is special */
1658	if (idx == PERF_HPP_DIFF__BASELINE)
1659		hpp__entry_baseline(he, buf, size);
1660	else {
1661		if (pair)
1662			hpp__entry_pair(he, pair, idx, buf, size);
1663		else
1664			hpp__entry_unpair(he, idx, buf, size);
1665	}
1666}
1667
1668static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
1669			     struct hist_entry *he)
1670{
1671	struct diff_hpp_fmt *dfmt =
1672		container_of(_fmt, struct diff_hpp_fmt, fmt);
1673	char buf[MAX_COL_WIDTH] = " ";
1674
1675	__hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
1676
1677	if (symbol_conf.field_sep)
1678		return scnprintf(hpp->buf, hpp->size, "%s", buf);
1679	else
1680		return scnprintf(hpp->buf, hpp->size, "%*s",
1681				 dfmt->header_width, buf);
1682}
1683
1684static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
1685		       struct hists *hists __maybe_unused,
1686		       int line __maybe_unused,
1687		       int *span __maybe_unused)
1688{
1689	struct diff_hpp_fmt *dfmt =
1690		container_of(fmt, struct diff_hpp_fmt, fmt);
1691
1692	BUG_ON(!dfmt->header);
1693	return scnprintf(hpp->buf, hpp->size, dfmt->header);
1694}
1695
1696static int hpp__width(struct perf_hpp_fmt *fmt,
1697		      struct perf_hpp *hpp __maybe_unused,
1698		      struct hists *hists __maybe_unused)
1699{
1700	struct diff_hpp_fmt *dfmt =
1701		container_of(fmt, struct diff_hpp_fmt, fmt);
1702
1703	BUG_ON(dfmt->header_width <= 0);
1704	return dfmt->header_width;
1705}
1706
1707static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
1708{
1709#define MAX_HEADER_NAME 100
1710	char buf_indent[MAX_HEADER_NAME];
1711	char buf[MAX_HEADER_NAME];
1712	const char *header = NULL;
1713	int width = 0;
1714
1715	BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1716	header = columns[dfmt->idx].name;
1717	width  = columns[dfmt->idx].width;
1718
1719	/* Only our defined HPP fmts should appear here. */
1720	BUG_ON(!header);
1721
1722	if (data__files_cnt > 2)
1723		scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1724
1725#define NAME (data__files_cnt > 2 ? buf : header)
1726	dfmt->header_width = width;
1727	width = (int) strlen(NAME);
1728	if (dfmt->header_width < width)
1729		dfmt->header_width = width;
1730
1731	scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1732		  dfmt->header_width, NAME);
1733
1734	dfmt->header = strdup(buf_indent);
1735#undef MAX_HEADER_NAME
1736#undef NAME
1737}
1738
1739static void data__hpp_register(struct data__file *d, int idx)
1740{
1741	struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1742	struct perf_hpp_fmt *fmt = &dfmt->fmt;
1743
1744	dfmt->idx = idx;
1745
1746	fmt->header = hpp__header;
1747	fmt->width  = hpp__width;
1748	fmt->entry  = hpp__entry_global;
1749	fmt->cmp    = hist_entry__cmp_nop;
1750	fmt->collapse = hist_entry__cmp_nop;
1751
1752	/* TODO more colors */
1753	switch (idx) {
1754	case PERF_HPP_DIFF__BASELINE:
1755		fmt->color = hpp__color_baseline;
1756		fmt->sort  = hist_entry__cmp_baseline;
1757		break;
1758	case PERF_HPP_DIFF__DELTA:
1759		fmt->color = hpp__color_delta;
1760		fmt->sort  = hist_entry__cmp_delta;
1761		break;
1762	case PERF_HPP_DIFF__RATIO:
1763		fmt->color = hpp__color_ratio;
1764		fmt->sort  = hist_entry__cmp_ratio;
1765		break;
1766	case PERF_HPP_DIFF__WEIGHTED_DIFF:
1767		fmt->color = hpp__color_wdiff;
1768		fmt->sort  = hist_entry__cmp_wdiff;
1769		break;
1770	case PERF_HPP_DIFF__DELTA_ABS:
1771		fmt->color = hpp__color_delta;
1772		fmt->sort  = hist_entry__cmp_delta_abs;
1773		break;
1774	case PERF_HPP_DIFF__CYCLES:
1775		fmt->color = hpp__color_cycles;
1776		fmt->sort  = hist_entry__cmp_nop;
1777		break;
1778	case PERF_HPP_DIFF__CYCLES_HIST:
1779		fmt->color = hpp__color_cycles_hist;
1780		fmt->sort  = hist_entry__cmp_nop;
1781		break;
1782	default:
1783		fmt->sort  = hist_entry__cmp_nop;
1784		break;
1785	}
1786
1787	init_header(d, dfmt);
1788	perf_hpp__column_register(fmt);
1789	perf_hpp__register_sort_field(fmt);
1790}
1791
1792static int ui_init(void)
1793{
1794	struct data__file *d;
1795	struct perf_hpp_fmt *fmt;
1796	int i;
1797
1798	data__for_each_file(i, d) {
1799
1800		/*
1801		 * Baseline or compute related columns:
1802		 *
1803		 *   PERF_HPP_DIFF__BASELINE
1804		 *   PERF_HPP_DIFF__DELTA
1805		 *   PERF_HPP_DIFF__RATIO
1806		 *   PERF_HPP_DIFF__WEIGHTED_DIFF
1807		 *   PERF_HPP_DIFF__CYCLES
1808		 */
1809		data__hpp_register(d, i ? compute_2_hpp[compute] :
1810					  PERF_HPP_DIFF__BASELINE);
1811
1812		if (cycles_hist && i)
1813			data__hpp_register(d, PERF_HPP_DIFF__CYCLES_HIST);
1814
1815		/*
1816		 * And the rest:
1817		 *
1818		 * PERF_HPP_DIFF__FORMULA
1819		 * PERF_HPP_DIFF__PERIOD
1820		 * PERF_HPP_DIFF__PERIOD_BASELINE
1821		 */
1822		if (show_formula && i)
1823			data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1824
1825		if (show_period)
1826			data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1827						  PERF_HPP_DIFF__PERIOD_BASELINE);
1828	}
1829
1830	if (!sort_compute)
1831		return 0;
1832
1833	/*
1834	 * Prepend an fmt to sort on columns at 'sort_compute' first.
1835	 * This fmt is added only to the sort list but not to the
1836	 * output fields list.
1837	 *
1838	 * Note that this column (data) can be compared twice - one
1839	 * for this 'sort_compute' fmt and another for the normal
1840	 * diff_hpp_fmt.  But it shouldn't a problem as most entries
1841	 * will be sorted out by first try or baseline and comparing
1842	 * is not a costly operation.
1843	 */
1844	fmt = zalloc(sizeof(*fmt));
1845	if (fmt == NULL) {
1846		pr_err("Memory allocation failed\n");
1847		return -1;
1848	}
1849
1850	fmt->cmp      = hist_entry__cmp_nop;
1851	fmt->collapse = hist_entry__cmp_nop;
1852
1853	switch (compute) {
1854	case COMPUTE_DELTA:
1855		fmt->sort = hist_entry__cmp_delta_idx;
1856		break;
1857	case COMPUTE_RATIO:
1858		fmt->sort = hist_entry__cmp_ratio_idx;
1859		break;
1860	case COMPUTE_WEIGHTED_DIFF:
1861		fmt->sort = hist_entry__cmp_wdiff_idx;
1862		break;
1863	case COMPUTE_DELTA_ABS:
1864		fmt->sort = hist_entry__cmp_delta_abs_idx;
1865		break;
1866	case COMPUTE_CYCLES:
1867		/*
1868		 * Should set since 'fmt->sort' is called without
1869		 * checking valid during sorting
1870		 */
1871		fmt->sort = hist_entry__cmp_nop;
1872		break;
1873	default:
1874		BUG_ON(1);
1875	}
1876
1877	perf_hpp__prepend_sort_field(fmt);
1878	return 0;
1879}
1880
1881static int data_init(int argc, const char **argv)
1882{
1883	struct data__file *d;
1884	static const char *defaults[] = {
1885		"perf.data.old",
1886		"perf.data",
1887	};
1888	bool use_default = true;
1889	int i;
1890
1891	data__files_cnt = 2;
1892
1893	if (argc) {
1894		if (argc == 1)
1895			defaults[1] = argv[0];
1896		else {
1897			data__files_cnt = argc;
1898			use_default = false;
1899		}
1900	} else if (perf_guest) {
1901		defaults[0] = "perf.data.host";
1902		defaults[1] = "perf.data.guest";
1903	}
1904
1905	if (sort_compute >= (unsigned int) data__files_cnt) {
1906		pr_err("Order option out of limit.\n");
1907		return -EINVAL;
1908	}
1909
1910	data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1911	if (!data__files)
1912		return -ENOMEM;
1913
1914	data__for_each_file(i, d) {
1915		struct perf_data *data = &d->data;
1916
1917		data->path  = use_default ? defaults[i] : argv[i];
1918		data->mode  = PERF_DATA_MODE_READ;
1919		data->force = force;
1920
1921		d->idx  = i;
1922	}
1923
1924	return 0;
1925}
1926
1927static int diff__config(const char *var, const char *value,
1928			void *cb __maybe_unused)
1929{
1930	if (!strcmp(var, "diff.order")) {
1931		int ret;
1932		if (perf_config_int(&ret, var, value) < 0)
1933			return -1;
1934		sort_compute = ret;
1935		return 0;
1936	}
1937	if (!strcmp(var, "diff.compute")) {
1938		if (!strcmp(value, "delta")) {
1939			compute = COMPUTE_DELTA;
1940		} else if (!strcmp(value, "delta-abs")) {
1941			compute = COMPUTE_DELTA_ABS;
1942		} else if (!strcmp(value, "ratio")) {
1943			compute = COMPUTE_RATIO;
1944		} else if (!strcmp(value, "wdiff")) {
1945			compute = COMPUTE_WEIGHTED_DIFF;
1946		} else {
1947			pr_err("Invalid compute method: %s\n", value);
1948			return -1;
1949		}
1950	}
1951
1952	return 0;
1953}
1954
1955int cmd_diff(int argc, const char **argv)
1956{
1957	int ret = hists__init();
1958
1959	if (ret < 0)
1960		return ret;
1961
1962	perf_config(diff__config, NULL);
1963
1964	argc = parse_options(argc, argv, options, diff_usage, 0);
1965
1966	if (quiet)
1967		perf_quiet_option();
1968
1969	if (cycles_hist && (compute != COMPUTE_CYCLES))
1970		usage_with_options(diff_usage, options);
1971
1972	if (pdiff.stream)
1973		compute = COMPUTE_STREAM;
1974
1975	symbol__annotation_init();
1976
1977	if (symbol__init(NULL) < 0)
1978		return -1;
1979
1980	if (data_init(argc, argv) < 0)
1981		return -1;
1982
1983	if (check_file_brstack() < 0)
1984		return -1;
1985
1986	if ((compute == COMPUTE_CYCLES || compute == COMPUTE_STREAM)
1987	    && !pdiff.has_br_stack) {
1988		return -1;
1989	}
1990
1991	if (compute == COMPUTE_STREAM) {
1992		symbol_conf.show_branchflag_count = true;
1993		symbol_conf.disable_add2line_warn = true;
1994		callchain_param.mode = CHAIN_FLAT;
1995		callchain_param.key = CCKEY_SRCLINE;
1996		callchain_param.branch_callstack = 1;
1997		symbol_conf.use_callchain = true;
1998		callchain_register_param(&callchain_param);
1999		sort_order = "srcline,symbol,dso";
2000	} else {
2001		if (ui_init() < 0)
2002			return -1;
2003
2004		sort__mode = SORT_MODE__DIFF;
2005	}
2006
2007	if (setup_sorting(NULL) < 0)
2008		usage_with_options(diff_usage, options);
2009
2010	setup_pager();
2011
2012	sort__setup_elide(NULL);
2013
2014	return __cmd_diff();
2015}