xref: /openbmc/linux/tools/perf/builtin-diff.c (revision 6774def6)
1 /*
2  * builtin-diff.c
3  *
4  * Builtin diff command: Analyze two perf.data input files, look up and read
5  * DSOs and symbol information, sort them and produce a diff.
6  */
7 #include "builtin.h"
8 
9 #include "util/debug.h"
10 #include "util/event.h"
11 #include "util/hist.h"
12 #include "util/evsel.h"
13 #include "util/evlist.h"
14 #include "util/session.h"
15 #include "util/tool.h"
16 #include "util/sort.h"
17 #include "util/symbol.h"
18 #include "util/util.h"
19 #include "util/data.h"
20 
21 #include <stdlib.h>
22 #include <math.h>
23 
24 /* Diff command specific HPP columns. */
25 enum {
26 	PERF_HPP_DIFF__BASELINE,
27 	PERF_HPP_DIFF__PERIOD,
28 	PERF_HPP_DIFF__PERIOD_BASELINE,
29 	PERF_HPP_DIFF__DELTA,
30 	PERF_HPP_DIFF__RATIO,
31 	PERF_HPP_DIFF__WEIGHTED_DIFF,
32 	PERF_HPP_DIFF__FORMULA,
33 
34 	PERF_HPP_DIFF__MAX_INDEX
35 };
36 
37 struct diff_hpp_fmt {
38 	struct perf_hpp_fmt	 fmt;
39 	int			 idx;
40 	char			*header;
41 	int			 header_width;
42 };
43 
44 struct data__file {
45 	struct perf_session	*session;
46 	struct perf_data_file	file;
47 	int			 idx;
48 	struct hists		*hists;
49 	struct diff_hpp_fmt	 fmt[PERF_HPP_DIFF__MAX_INDEX];
50 };
51 
52 static struct data__file *data__files;
53 static int data__files_cnt;
54 
55 #define data__for_each_file_start(i, d, s)	\
56 	for (i = s, d = &data__files[s];	\
57 	     i < data__files_cnt;		\
58 	     i++, d = &data__files[i])
59 
60 #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)
61 #define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1)
62 
63 static bool force;
64 static bool show_period;
65 static bool show_formula;
66 static bool show_baseline_only;
67 static unsigned int sort_compute;
68 
69 static s64 compute_wdiff_w1;
70 static s64 compute_wdiff_w2;
71 
72 enum {
73 	COMPUTE_DELTA,
74 	COMPUTE_RATIO,
75 	COMPUTE_WEIGHTED_DIFF,
76 	COMPUTE_MAX,
77 };
78 
79 const char *compute_names[COMPUTE_MAX] = {
80 	[COMPUTE_DELTA] = "delta",
81 	[COMPUTE_RATIO] = "ratio",
82 	[COMPUTE_WEIGHTED_DIFF] = "wdiff",
83 };
84 
85 static int compute;
86 
87 static int compute_2_hpp[COMPUTE_MAX] = {
88 	[COMPUTE_DELTA]		= PERF_HPP_DIFF__DELTA,
89 	[COMPUTE_RATIO]		= PERF_HPP_DIFF__RATIO,
90 	[COMPUTE_WEIGHTED_DIFF]	= PERF_HPP_DIFF__WEIGHTED_DIFF,
91 };
92 
93 #define MAX_COL_WIDTH 70
94 
95 static struct header_column {
96 	const char *name;
97 	int width;
98 } columns[PERF_HPP_DIFF__MAX_INDEX] = {
99 	[PERF_HPP_DIFF__BASELINE] = {
100 		.name  = "Baseline",
101 	},
102 	[PERF_HPP_DIFF__PERIOD] = {
103 		.name  = "Period",
104 		.width = 14,
105 	},
106 	[PERF_HPP_DIFF__PERIOD_BASELINE] = {
107 		.name  = "Base period",
108 		.width = 14,
109 	},
110 	[PERF_HPP_DIFF__DELTA] = {
111 		.name  = "Delta",
112 		.width = 7,
113 	},
114 	[PERF_HPP_DIFF__RATIO] = {
115 		.name  = "Ratio",
116 		.width = 14,
117 	},
118 	[PERF_HPP_DIFF__WEIGHTED_DIFF] = {
119 		.name  = "Weighted diff",
120 		.width = 14,
121 	},
122 	[PERF_HPP_DIFF__FORMULA] = {
123 		.name  = "Formula",
124 		.width = MAX_COL_WIDTH,
125 	}
126 };
127 
128 static int setup_compute_opt_wdiff(char *opt)
129 {
130 	char *w1_str = opt;
131 	char *w2_str;
132 
133 	int ret = -EINVAL;
134 
135 	if (!opt)
136 		goto out;
137 
138 	w2_str = strchr(opt, ',');
139 	if (!w2_str)
140 		goto out;
141 
142 	*w2_str++ = 0x0;
143 	if (!*w2_str)
144 		goto out;
145 
146 	compute_wdiff_w1 = strtol(w1_str, NULL, 10);
147 	compute_wdiff_w2 = strtol(w2_str, NULL, 10);
148 
149 	if (!compute_wdiff_w1 || !compute_wdiff_w2)
150 		goto out;
151 
152 	pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
153 		  compute_wdiff_w1, compute_wdiff_w2);
154 
155 	ret = 0;
156 
157  out:
158 	if (ret)
159 		pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");
160 
161 	return ret;
162 }
163 
164 static int setup_compute_opt(char *opt)
165 {
166 	if (compute == COMPUTE_WEIGHTED_DIFF)
167 		return setup_compute_opt_wdiff(opt);
168 
169 	if (opt) {
170 		pr_err("Failed: extra option specified '%s'", opt);
171 		return -EINVAL;
172 	}
173 
174 	return 0;
175 }
176 
177 static int setup_compute(const struct option *opt, const char *str,
178 			 int unset __maybe_unused)
179 {
180 	int *cp = (int *) opt->value;
181 	char *cstr = (char *) str;
182 	char buf[50];
183 	unsigned i;
184 	char *option;
185 
186 	if (!str) {
187 		*cp = COMPUTE_DELTA;
188 		return 0;
189 	}
190 
191 	option = strchr(str, ':');
192 	if (option) {
193 		unsigned len = option++ - str;
194 
195 		/*
196 		 * The str data are not writeable, so we need
197 		 * to use another buffer.
198 		 */
199 
200 		/* No option value is longer. */
201 		if (len >= sizeof(buf))
202 			return -EINVAL;
203 
204 		strncpy(buf, str, len);
205 		buf[len] = 0x0;
206 		cstr = buf;
207 	}
208 
209 	for (i = 0; i < COMPUTE_MAX; i++)
210 		if (!strcmp(cstr, compute_names[i])) {
211 			*cp = i;
212 			return setup_compute_opt(option);
213 		}
214 
215 	pr_err("Failed: '%s' is not computation method "
216 	       "(use 'delta','ratio' or 'wdiff')\n", str);
217 	return -EINVAL;
218 }
219 
220 static double period_percent(struct hist_entry *he, u64 period)
221 {
222 	u64 total = hists__total_period(he->hists);
223 
224 	return (period * 100.0) / total;
225 }
226 
227 static double compute_delta(struct hist_entry *he, struct hist_entry *pair)
228 {
229 	double old_percent = period_percent(he, he->stat.period);
230 	double new_percent = period_percent(pair, pair->stat.period);
231 
232 	pair->diff.period_ratio_delta = new_percent - old_percent;
233 	pair->diff.computed = true;
234 	return pair->diff.period_ratio_delta;
235 }
236 
237 static double compute_ratio(struct hist_entry *he, struct hist_entry *pair)
238 {
239 	double old_period = he->stat.period ?: 1;
240 	double new_period = pair->stat.period;
241 
242 	pair->diff.computed = true;
243 	pair->diff.period_ratio = new_period / old_period;
244 	return pair->diff.period_ratio;
245 }
246 
247 static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
248 {
249 	u64 old_period = he->stat.period;
250 	u64 new_period = pair->stat.period;
251 
252 	pair->diff.computed = true;
253 	pair->diff.wdiff = new_period * compute_wdiff_w2 -
254 			   old_period * compute_wdiff_w1;
255 
256 	return pair->diff.wdiff;
257 }
258 
259 static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
260 			 char *buf, size_t size)
261 {
262 	u64 he_total = he->hists->stats.total_period;
263 	u64 pair_total = pair->hists->stats.total_period;
264 
265 	if (symbol_conf.filter_relative) {
266 		he_total = he->hists->stats.total_non_filtered_period;
267 		pair_total = pair->hists->stats.total_non_filtered_period;
268 	}
269 	return scnprintf(buf, size,
270 			 "(%" PRIu64 " * 100 / %" PRIu64 ") - "
271 			 "(%" PRIu64 " * 100 / %" PRIu64 ")",
272 			 pair->stat.period, pair_total,
273 			 he->stat.period, he_total);
274 }
275 
276 static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
277 			 char *buf, size_t size)
278 {
279 	double old_period = he->stat.period;
280 	double new_period = pair->stat.period;
281 
282 	return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
283 }
284 
285 static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
286 			 char *buf, size_t size)
287 {
288 	u64 old_period = he->stat.period;
289 	u64 new_period = pair->stat.period;
290 
291 	return scnprintf(buf, size,
292 		  "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
293 		  new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
294 }
295 
296 static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,
297 			   char *buf, size_t size)
298 {
299 	switch (compute) {
300 	case COMPUTE_DELTA:
301 		return formula_delta(he, pair, buf, size);
302 	case COMPUTE_RATIO:
303 		return formula_ratio(he, pair, buf, size);
304 	case COMPUTE_WEIGHTED_DIFF:
305 		return formula_wdiff(he, pair, buf, size);
306 	default:
307 		BUG_ON(1);
308 	}
309 
310 	return -1;
311 }
312 
313 static int hists__add_entry(struct hists *hists,
314 			    struct addr_location *al, u64 period,
315 			    u64 weight, u64 transaction)
316 {
317 	if (__hists__add_entry(hists, al, NULL, NULL, NULL, period, weight,
318 			       transaction, true) != NULL)
319 		return 0;
320 	return -ENOMEM;
321 }
322 
323 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
324 				      union perf_event *event,
325 				      struct perf_sample *sample,
326 				      struct perf_evsel *evsel,
327 				      struct machine *machine)
328 {
329 	struct addr_location al;
330 	struct hists *hists = evsel__hists(evsel);
331 
332 	if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
333 		pr_warning("problem processing %d event, skipping it.\n",
334 			   event->header.type);
335 		return -1;
336 	}
337 
338 	if (hists__add_entry(hists, &al, sample->period,
339 			     sample->weight, sample->transaction)) {
340 		pr_warning("problem incrementing symbol period, skipping event\n");
341 		return -1;
342 	}
343 
344 	/*
345 	 * The total_period is updated here before going to the output
346 	 * tree since normally only the baseline hists will call
347 	 * hists__output_resort() and precompute needs the total
348 	 * period in order to sort entries by percentage delta.
349 	 */
350 	hists->stats.total_period += sample->period;
351 	if (!al.filtered)
352 		hists->stats.total_non_filtered_period += sample->period;
353 
354 	return 0;
355 }
356 
357 static struct perf_tool tool = {
358 	.sample	= diff__process_sample_event,
359 	.mmap	= perf_event__process_mmap,
360 	.comm	= perf_event__process_comm,
361 	.exit	= perf_event__process_exit,
362 	.fork	= perf_event__process_fork,
363 	.lost	= perf_event__process_lost,
364 	.ordered_events = true,
365 	.ordering_requires_timestamps = true,
366 };
367 
368 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
369 				      struct perf_evlist *evlist)
370 {
371 	struct perf_evsel *e;
372 
373 	evlist__for_each(evlist, e) {
374 		if (perf_evsel__match2(evsel, e))
375 			return e;
376 	}
377 
378 	return NULL;
379 }
380 
381 static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
382 {
383 	struct perf_evsel *evsel;
384 
385 	evlist__for_each(evlist, evsel) {
386 		struct hists *hists = evsel__hists(evsel);
387 
388 		hists__collapse_resort(hists, NULL);
389 	}
390 }
391 
392 static struct hist_entry*
393 get_pair_data(struct hist_entry *he, struct data__file *d)
394 {
395 	if (hist_entry__has_pairs(he)) {
396 		struct hist_entry *pair;
397 
398 		list_for_each_entry(pair, &he->pairs.head, pairs.node)
399 			if (pair->hists == d->hists)
400 				return pair;
401 	}
402 
403 	return NULL;
404 }
405 
406 static struct hist_entry*
407 get_pair_fmt(struct hist_entry *he, struct diff_hpp_fmt *dfmt)
408 {
409 	void *ptr = dfmt - dfmt->idx;
410 	struct data__file *d = container_of(ptr, struct data__file, fmt);
411 
412 	return get_pair_data(he, d);
413 }
414 
415 static void hists__baseline_only(struct hists *hists)
416 {
417 	struct rb_root *root;
418 	struct rb_node *next;
419 
420 	if (sort__need_collapse)
421 		root = &hists->entries_collapsed;
422 	else
423 		root = hists->entries_in;
424 
425 	next = rb_first(root);
426 	while (next != NULL) {
427 		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
428 
429 		next = rb_next(&he->rb_node_in);
430 		if (!hist_entry__next_pair(he)) {
431 			rb_erase(&he->rb_node_in, root);
432 			hist_entry__free(he);
433 		}
434 	}
435 }
436 
437 static void hists__precompute(struct hists *hists)
438 {
439 	struct rb_root *root;
440 	struct rb_node *next;
441 
442 	if (sort__need_collapse)
443 		root = &hists->entries_collapsed;
444 	else
445 		root = hists->entries_in;
446 
447 	next = rb_first(root);
448 	while (next != NULL) {
449 		struct hist_entry *he, *pair;
450 
451 		he   = rb_entry(next, struct hist_entry, rb_node_in);
452 		next = rb_next(&he->rb_node_in);
453 
454 		pair = get_pair_data(he, &data__files[sort_compute]);
455 		if (!pair)
456 			continue;
457 
458 		switch (compute) {
459 		case COMPUTE_DELTA:
460 			compute_delta(he, pair);
461 			break;
462 		case COMPUTE_RATIO:
463 			compute_ratio(he, pair);
464 			break;
465 		case COMPUTE_WEIGHTED_DIFF:
466 			compute_wdiff(he, pair);
467 			break;
468 		default:
469 			BUG_ON(1);
470 		}
471 	}
472 }
473 
474 static int64_t cmp_doubles(double l, double r)
475 {
476 	if (l > r)
477 		return -1;
478 	else if (l < r)
479 		return 1;
480 	else
481 		return 0;
482 }
483 
484 static int64_t
485 __hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
486 			int c)
487 {
488 	switch (c) {
489 	case COMPUTE_DELTA:
490 	{
491 		double l = left->diff.period_ratio_delta;
492 		double r = right->diff.period_ratio_delta;
493 
494 		return cmp_doubles(l, r);
495 	}
496 	case COMPUTE_RATIO:
497 	{
498 		double l = left->diff.period_ratio;
499 		double r = right->diff.period_ratio;
500 
501 		return cmp_doubles(l, r);
502 	}
503 	case COMPUTE_WEIGHTED_DIFF:
504 	{
505 		s64 l = left->diff.wdiff;
506 		s64 r = right->diff.wdiff;
507 
508 		return r - l;
509 	}
510 	default:
511 		BUG_ON(1);
512 	}
513 
514 	return 0;
515 }
516 
517 static int64_t
518 hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
519 			int c)
520 {
521 	bool pairs_left  = hist_entry__has_pairs(left);
522 	bool pairs_right = hist_entry__has_pairs(right);
523 	struct hist_entry *p_right, *p_left;
524 
525 	if (!pairs_left && !pairs_right)
526 		return 0;
527 
528 	if (!pairs_left || !pairs_right)
529 		return pairs_left ? -1 : 1;
530 
531 	p_left  = get_pair_data(left,  &data__files[sort_compute]);
532 	p_right = get_pair_data(right, &data__files[sort_compute]);
533 
534 	if (!p_left && !p_right)
535 		return 0;
536 
537 	if (!p_left || !p_right)
538 		return p_left ? -1 : 1;
539 
540 	/*
541 	 * We have 2 entries of same kind, let's
542 	 * make the data comparison.
543 	 */
544 	return __hist_entry__cmp_compute(p_left, p_right, c);
545 }
546 
547 static void insert_hist_entry_by_compute(struct rb_root *root,
548 					 struct hist_entry *he,
549 					 int c)
550 {
551 	struct rb_node **p = &root->rb_node;
552 	struct rb_node *parent = NULL;
553 	struct hist_entry *iter;
554 
555 	while (*p != NULL) {
556 		parent = *p;
557 		iter = rb_entry(parent, struct hist_entry, rb_node);
558 		if (hist_entry__cmp_compute(he, iter, c) < 0)
559 			p = &(*p)->rb_left;
560 		else
561 			p = &(*p)->rb_right;
562 	}
563 
564 	rb_link_node(&he->rb_node, parent, p);
565 	rb_insert_color(&he->rb_node, root);
566 }
567 
568 static void hists__compute_resort(struct hists *hists)
569 {
570 	struct rb_root *root;
571 	struct rb_node *next;
572 
573 	if (sort__need_collapse)
574 		root = &hists->entries_collapsed;
575 	else
576 		root = hists->entries_in;
577 
578 	hists->entries = RB_ROOT;
579 	next = rb_first(root);
580 
581 	hists__reset_stats(hists);
582 	hists__reset_col_len(hists);
583 
584 	while (next != NULL) {
585 		struct hist_entry *he;
586 
587 		he = rb_entry(next, struct hist_entry, rb_node_in);
588 		next = rb_next(&he->rb_node_in);
589 
590 		insert_hist_entry_by_compute(&hists->entries, he, compute);
591 		hists__inc_stats(hists, he);
592 
593 		if (!he->filtered)
594 			hists__calc_col_len(hists, he);
595 	}
596 }
597 
598 static void hists__process(struct hists *hists)
599 {
600 	if (show_baseline_only)
601 		hists__baseline_only(hists);
602 
603 	if (sort_compute) {
604 		hists__precompute(hists);
605 		hists__compute_resort(hists);
606 	} else {
607 		hists__output_resort(hists);
608 	}
609 
610 	hists__fprintf(hists, true, 0, 0, 0, stdout);
611 }
612 
613 static void data__fprintf(void)
614 {
615 	struct data__file *d;
616 	int i;
617 
618 	fprintf(stdout, "# Data files:\n");
619 
620 	data__for_each_file(i, d)
621 		fprintf(stdout, "#  [%d] %s %s\n",
622 			d->idx, d->file.path,
623 			!d->idx ? "(Baseline)" : "");
624 
625 	fprintf(stdout, "#\n");
626 }
627 
628 static void data_process(void)
629 {
630 	struct perf_evlist *evlist_base = data__files[0].session->evlist;
631 	struct perf_evsel *evsel_base;
632 	bool first = true;
633 
634 	evlist__for_each(evlist_base, evsel_base) {
635 		struct hists *hists_base = evsel__hists(evsel_base);
636 		struct data__file *d;
637 		int i;
638 
639 		data__for_each_file_new(i, d) {
640 			struct perf_evlist *evlist = d->session->evlist;
641 			struct perf_evsel *evsel;
642 			struct hists *hists;
643 
644 			evsel = evsel_match(evsel_base, evlist);
645 			if (!evsel)
646 				continue;
647 
648 			hists = evsel__hists(evsel);
649 			d->hists = hists;
650 
651 			hists__match(hists_base, hists);
652 
653 			if (!show_baseline_only)
654 				hists__link(hists_base, hists);
655 		}
656 
657 		fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
658 			perf_evsel__name(evsel_base));
659 
660 		first = false;
661 
662 		if (verbose || data__files_cnt > 2)
663 			data__fprintf();
664 
665 		hists__process(hists_base);
666 	}
667 }
668 
669 static void data__free(struct data__file *d)
670 {
671 	int col;
672 
673 	for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
674 		struct diff_hpp_fmt *fmt = &d->fmt[col];
675 
676 		zfree(&fmt->header);
677 	}
678 }
679 
680 static int __cmd_diff(void)
681 {
682 	struct data__file *d;
683 	int ret = -EINVAL, i;
684 
685 	data__for_each_file(i, d) {
686 		d->session = perf_session__new(&d->file, false, &tool);
687 		if (!d->session) {
688 			pr_err("Failed to open %s\n", d->file.path);
689 			ret = -1;
690 			goto out_delete;
691 		}
692 
693 		ret = perf_session__process_events(d->session, &tool);
694 		if (ret) {
695 			pr_err("Failed to process %s\n", d->file.path);
696 			goto out_delete;
697 		}
698 
699 		perf_evlist__collapse_resort(d->session->evlist);
700 	}
701 
702 	data_process();
703 
704  out_delete:
705 	data__for_each_file(i, d) {
706 		if (d->session)
707 			perf_session__delete(d->session);
708 
709 		data__free(d);
710 	}
711 
712 	free(data__files);
713 	return ret;
714 }
715 
716 static const char * const diff_usage[] = {
717 	"perf diff [<options>] [old_file] [new_file]",
718 	NULL,
719 };
720 
721 static const struct option options[] = {
722 	OPT_INCR('v', "verbose", &verbose,
723 		    "be more verbose (show symbol address, etc)"),
724 	OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
725 		    "Show only items with match in baseline"),
726 	OPT_CALLBACK('c', "compute", &compute,
727 		     "delta,ratio,wdiff:w1,w2 (default delta)",
728 		     "Entries differential computation selection",
729 		     setup_compute),
730 	OPT_BOOLEAN('p', "period", &show_period,
731 		    "Show period values."),
732 	OPT_BOOLEAN('F', "formula", &show_formula,
733 		    "Show formula."),
734 	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
735 		    "dump raw trace in ASCII"),
736 	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
737 	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
738 		    "load module symbols - WARNING: use only with -k and LIVE kernel"),
739 	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
740 		   "only consider symbols in these dsos"),
741 	OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
742 		   "only consider symbols in these comms"),
743 	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
744 		   "only consider these symbols"),
745 	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
746 		   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
747 		   " Please refer the man page for the complete list."),
748 	OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
749 		   "separator for columns, no spaces will be added between "
750 		   "columns '.' is reserved."),
751 	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
752 		    "Look for files with symbols relative to this directory"),
753 	OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
754 	OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
755 		     "How to display percentage of filtered entries", parse_filter_percentage),
756 	OPT_END()
757 };
758 
759 static double baseline_percent(struct hist_entry *he)
760 {
761 	u64 total = hists__total_period(he->hists);
762 
763 	return 100.0 * he->stat.period / total;
764 }
765 
766 static int hpp__color_baseline(struct perf_hpp_fmt *fmt,
767 			       struct perf_hpp *hpp, struct hist_entry *he)
768 {
769 	struct diff_hpp_fmt *dfmt =
770 		container_of(fmt, struct diff_hpp_fmt, fmt);
771 	double percent = baseline_percent(he);
772 	char pfmt[20] = " ";
773 
774 	if (!he->dummy) {
775 		scnprintf(pfmt, 20, "%%%d.2f%%%%", dfmt->header_width - 1);
776 		return percent_color_snprintf(hpp->buf, hpp->size,
777 					      pfmt, percent);
778 	} else
779 		return scnprintf(hpp->buf, hpp->size, "%*s",
780 				 dfmt->header_width, pfmt);
781 }
782 
783 static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
784 {
785 	double percent = baseline_percent(he);
786 	const char *fmt = symbol_conf.field_sep ? "%.2f" : "%6.2f%%";
787 	int ret = 0;
788 
789 	if (!he->dummy)
790 		ret = scnprintf(buf, size, fmt, percent);
791 
792 	return ret;
793 }
794 
795 static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
796 				struct perf_hpp *hpp, struct hist_entry *he,
797 				int comparison_method)
798 {
799 	struct diff_hpp_fmt *dfmt =
800 		container_of(fmt, struct diff_hpp_fmt, fmt);
801 	struct hist_entry *pair = get_pair_fmt(he, dfmt);
802 	double diff;
803 	s64 wdiff;
804 	char pfmt[20] = " ";
805 
806 	if (!pair)
807 		goto dummy_print;
808 
809 	switch (comparison_method) {
810 	case COMPUTE_DELTA:
811 		if (pair->diff.computed)
812 			diff = pair->diff.period_ratio_delta;
813 		else
814 			diff = compute_delta(he, pair);
815 
816 		if (fabs(diff) < 0.01)
817 			goto dummy_print;
818 		scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
819 		return percent_color_snprintf(hpp->buf, hpp->size,
820 					pfmt, diff);
821 	case COMPUTE_RATIO:
822 		if (he->dummy)
823 			goto dummy_print;
824 		if (pair->diff.computed)
825 			diff = pair->diff.period_ratio;
826 		else
827 			diff = compute_ratio(he, pair);
828 
829 		scnprintf(pfmt, 20, "%%%d.6f", dfmt->header_width);
830 		return value_color_snprintf(hpp->buf, hpp->size,
831 					pfmt, diff);
832 	case COMPUTE_WEIGHTED_DIFF:
833 		if (he->dummy)
834 			goto dummy_print;
835 		if (pair->diff.computed)
836 			wdiff = pair->diff.wdiff;
837 		else
838 			wdiff = compute_wdiff(he, pair);
839 
840 		scnprintf(pfmt, 20, "%%14ld", dfmt->header_width);
841 		return color_snprintf(hpp->buf, hpp->size,
842 				get_percent_color(wdiff),
843 				pfmt, wdiff);
844 	default:
845 		BUG_ON(1);
846 	}
847 dummy_print:
848 	return scnprintf(hpp->buf, hpp->size, "%*s",
849 			dfmt->header_width, pfmt);
850 }
851 
852 static int hpp__color_delta(struct perf_hpp_fmt *fmt,
853 			struct perf_hpp *hpp, struct hist_entry *he)
854 {
855 	return __hpp__color_compare(fmt, hpp, he, COMPUTE_DELTA);
856 }
857 
858 static int hpp__color_ratio(struct perf_hpp_fmt *fmt,
859 			struct perf_hpp *hpp, struct hist_entry *he)
860 {
861 	return __hpp__color_compare(fmt, hpp, he, COMPUTE_RATIO);
862 }
863 
864 static int hpp__color_wdiff(struct perf_hpp_fmt *fmt,
865 			struct perf_hpp *hpp, struct hist_entry *he)
866 {
867 	return __hpp__color_compare(fmt, hpp, he, COMPUTE_WEIGHTED_DIFF);
868 }
869 
870 static void
871 hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
872 {
873 	switch (idx) {
874 	case PERF_HPP_DIFF__PERIOD_BASELINE:
875 		scnprintf(buf, size, "%" PRIu64, he->stat.period);
876 		break;
877 
878 	default:
879 		break;
880 	}
881 }
882 
883 static void
884 hpp__entry_pair(struct hist_entry *he, struct hist_entry *pair,
885 		int idx, char *buf, size_t size)
886 {
887 	double diff;
888 	double ratio;
889 	s64 wdiff;
890 
891 	switch (idx) {
892 	case PERF_HPP_DIFF__DELTA:
893 		if (pair->diff.computed)
894 			diff = pair->diff.period_ratio_delta;
895 		else
896 			diff = compute_delta(he, pair);
897 
898 		if (fabs(diff) >= 0.01)
899 			scnprintf(buf, size, "%+4.2F%%", diff);
900 		break;
901 
902 	case PERF_HPP_DIFF__RATIO:
903 		/* No point for ratio number if we are dummy.. */
904 		if (he->dummy)
905 			break;
906 
907 		if (pair->diff.computed)
908 			ratio = pair->diff.period_ratio;
909 		else
910 			ratio = compute_ratio(he, pair);
911 
912 		if (ratio > 0.0)
913 			scnprintf(buf, size, "%14.6F", ratio);
914 		break;
915 
916 	case PERF_HPP_DIFF__WEIGHTED_DIFF:
917 		/* No point for wdiff number if we are dummy.. */
918 		if (he->dummy)
919 			break;
920 
921 		if (pair->diff.computed)
922 			wdiff = pair->diff.wdiff;
923 		else
924 			wdiff = compute_wdiff(he, pair);
925 
926 		if (wdiff != 0)
927 			scnprintf(buf, size, "%14ld", wdiff);
928 		break;
929 
930 	case PERF_HPP_DIFF__FORMULA:
931 		formula_fprintf(he, pair, buf, size);
932 		break;
933 
934 	case PERF_HPP_DIFF__PERIOD:
935 		scnprintf(buf, size, "%" PRIu64, pair->stat.period);
936 		break;
937 
938 	default:
939 		BUG_ON(1);
940 	};
941 }
942 
943 static void
944 __hpp__entry_global(struct hist_entry *he, struct diff_hpp_fmt *dfmt,
945 		    char *buf, size_t size)
946 {
947 	struct hist_entry *pair = get_pair_fmt(he, dfmt);
948 	int idx = dfmt->idx;
949 
950 	/* baseline is special */
951 	if (idx == PERF_HPP_DIFF__BASELINE)
952 		hpp__entry_baseline(he, buf, size);
953 	else {
954 		if (pair)
955 			hpp__entry_pair(he, pair, idx, buf, size);
956 		else
957 			hpp__entry_unpair(he, idx, buf, size);
958 	}
959 }
960 
961 static int hpp__entry_global(struct perf_hpp_fmt *_fmt, struct perf_hpp *hpp,
962 			     struct hist_entry *he)
963 {
964 	struct diff_hpp_fmt *dfmt =
965 		container_of(_fmt, struct diff_hpp_fmt, fmt);
966 	char buf[MAX_COL_WIDTH] = " ";
967 
968 	__hpp__entry_global(he, dfmt, buf, MAX_COL_WIDTH);
969 
970 	if (symbol_conf.field_sep)
971 		return scnprintf(hpp->buf, hpp->size, "%s", buf);
972 	else
973 		return scnprintf(hpp->buf, hpp->size, "%*s",
974 				 dfmt->header_width, buf);
975 }
976 
977 static int hpp__header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
978 		       struct perf_evsel *evsel __maybe_unused)
979 {
980 	struct diff_hpp_fmt *dfmt =
981 		container_of(fmt, struct diff_hpp_fmt, fmt);
982 
983 	BUG_ON(!dfmt->header);
984 	return scnprintf(hpp->buf, hpp->size, dfmt->header);
985 }
986 
987 static int hpp__width(struct perf_hpp_fmt *fmt,
988 		      struct perf_hpp *hpp __maybe_unused,
989 		      struct perf_evsel *evsel __maybe_unused)
990 {
991 	struct diff_hpp_fmt *dfmt =
992 		container_of(fmt, struct diff_hpp_fmt, fmt);
993 
994 	BUG_ON(dfmt->header_width <= 0);
995 	return dfmt->header_width;
996 }
997 
998 static void init_header(struct data__file *d, struct diff_hpp_fmt *dfmt)
999 {
1000 #define MAX_HEADER_NAME 100
1001 	char buf_indent[MAX_HEADER_NAME];
1002 	char buf[MAX_HEADER_NAME];
1003 	const char *header = NULL;
1004 	int width = 0;
1005 
1006 	BUG_ON(dfmt->idx >= PERF_HPP_DIFF__MAX_INDEX);
1007 	header = columns[dfmt->idx].name;
1008 	width  = columns[dfmt->idx].width;
1009 
1010 	/* Only our defined HPP fmts should appear here. */
1011 	BUG_ON(!header);
1012 
1013 	if (data__files_cnt > 2)
1014 		scnprintf(buf, MAX_HEADER_NAME, "%s/%d", header, d->idx);
1015 
1016 #define NAME (data__files_cnt > 2 ? buf : header)
1017 	dfmt->header_width = width;
1018 	width = (int) strlen(NAME);
1019 	if (dfmt->header_width < width)
1020 		dfmt->header_width = width;
1021 
1022 	scnprintf(buf_indent, MAX_HEADER_NAME, "%*s",
1023 		  dfmt->header_width, NAME);
1024 
1025 	dfmt->header = strdup(buf_indent);
1026 #undef MAX_HEADER_NAME
1027 #undef NAME
1028 }
1029 
1030 static void data__hpp_register(struct data__file *d, int idx)
1031 {
1032 	struct diff_hpp_fmt *dfmt = &d->fmt[idx];
1033 	struct perf_hpp_fmt *fmt = &dfmt->fmt;
1034 
1035 	dfmt->idx = idx;
1036 
1037 	fmt->header = hpp__header;
1038 	fmt->width  = hpp__width;
1039 	fmt->entry  = hpp__entry_global;
1040 
1041 	/* TODO more colors */
1042 	switch (idx) {
1043 	case PERF_HPP_DIFF__BASELINE:
1044 		fmt->color = hpp__color_baseline;
1045 		break;
1046 	case PERF_HPP_DIFF__DELTA:
1047 		fmt->color = hpp__color_delta;
1048 		break;
1049 	case PERF_HPP_DIFF__RATIO:
1050 		fmt->color = hpp__color_ratio;
1051 		break;
1052 	case PERF_HPP_DIFF__WEIGHTED_DIFF:
1053 		fmt->color = hpp__color_wdiff;
1054 		break;
1055 	default:
1056 		break;
1057 	}
1058 
1059 	init_header(d, dfmt);
1060 	perf_hpp__column_register(fmt);
1061 }
1062 
1063 static void ui_init(void)
1064 {
1065 	struct data__file *d;
1066 	int i;
1067 
1068 	data__for_each_file(i, d) {
1069 
1070 		/*
1071 		 * Baseline or compute realted columns:
1072 		 *
1073 		 *   PERF_HPP_DIFF__BASELINE
1074 		 *   PERF_HPP_DIFF__DELTA
1075 		 *   PERF_HPP_DIFF__RATIO
1076 		 *   PERF_HPP_DIFF__WEIGHTED_DIFF
1077 		 */
1078 		data__hpp_register(d, i ? compute_2_hpp[compute] :
1079 					  PERF_HPP_DIFF__BASELINE);
1080 
1081 		/*
1082 		 * And the rest:
1083 		 *
1084 		 * PERF_HPP_DIFF__FORMULA
1085 		 * PERF_HPP_DIFF__PERIOD
1086 		 * PERF_HPP_DIFF__PERIOD_BASELINE
1087 		 */
1088 		if (show_formula && i)
1089 			data__hpp_register(d, PERF_HPP_DIFF__FORMULA);
1090 
1091 		if (show_period)
1092 			data__hpp_register(d, i ? PERF_HPP_DIFF__PERIOD :
1093 						  PERF_HPP_DIFF__PERIOD_BASELINE);
1094 	}
1095 }
1096 
1097 static int data_init(int argc, const char **argv)
1098 {
1099 	struct data__file *d;
1100 	static const char *defaults[] = {
1101 		"perf.data.old",
1102 		"perf.data",
1103 	};
1104 	bool use_default = true;
1105 	int i;
1106 
1107 	data__files_cnt = 2;
1108 
1109 	if (argc) {
1110 		if (argc == 1)
1111 			defaults[1] = argv[0];
1112 		else {
1113 			data__files_cnt = argc;
1114 			use_default = false;
1115 		}
1116 	} else if (perf_guest) {
1117 		defaults[0] = "perf.data.host";
1118 		defaults[1] = "perf.data.guest";
1119 	}
1120 
1121 	if (sort_compute >= (unsigned int) data__files_cnt) {
1122 		pr_err("Order option out of limit.\n");
1123 		return -EINVAL;
1124 	}
1125 
1126 	data__files = zalloc(sizeof(*data__files) * data__files_cnt);
1127 	if (!data__files)
1128 		return -ENOMEM;
1129 
1130 	data__for_each_file(i, d) {
1131 		struct perf_data_file *file = &d->file;
1132 
1133 		file->path  = use_default ? defaults[i] : argv[i];
1134 		file->mode  = PERF_DATA_MODE_READ,
1135 		file->force = force,
1136 
1137 		d->idx  = i;
1138 	}
1139 
1140 	return 0;
1141 }
1142 
1143 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
1144 {
1145 	int ret = hists__init();
1146 
1147 	if (ret < 0)
1148 		return ret;
1149 
1150 	perf_config(perf_default_config, NULL);
1151 
1152 	argc = parse_options(argc, argv, options, diff_usage, 0);
1153 
1154 	if (symbol__init(NULL) < 0)
1155 		return -1;
1156 
1157 	if (data_init(argc, argv) < 0)
1158 		return -1;
1159 
1160 	ui_init();
1161 
1162 	sort__mode = SORT_MODE__DIFF;
1163 
1164 	if (setup_sorting() < 0)
1165 		usage_with_options(diff_usage, options);
1166 
1167 	setup_pager();
1168 
1169 	sort__setup_elide(NULL);
1170 
1171 	return __cmd_diff();
1172 }
1173