aboutsummaryrefslogtreecommitdiff
path: root/tools/perf/builtin-diff.c
blob: 4af0b580b046e4f74191dee57946646adff4d306 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
/*
 * builtin-diff.c
 *
 * Builtin diff command: Analyze two perf.data input files, look up and read
 * DSOs and symbol information, sort them and produce a diff.
 */
#include "builtin.h"

#include "util/debug.h"
#include "util/event.h"
#include "util/hist.h"
#include "util/evsel.h"
#include "util/evlist.h"
#include "util/session.h"
#include "util/tool.h"
#include "util/sort.h"
#include "util/symbol.h"
#include "util/util.h"

#include <stdlib.h>

static char const *input_old = "perf.data.old",
		  *input_new = "perf.data";
static char	  diff__default_sort_order[] = "dso,symbol";
static bool  force;
static bool show_period;
static bool show_formula;
static bool show_baseline_only;
static bool sort_compute;

static s64 compute_wdiff_w1;
static s64 compute_wdiff_w2;

enum {
	COMPUTE_DELTA,
	COMPUTE_RATIO,
	COMPUTE_WEIGHTED_DIFF,
	COMPUTE_MAX,
};

const char *compute_names[COMPUTE_MAX] = {
	[COMPUTE_DELTA] = "delta",
	[COMPUTE_RATIO] = "ratio",
	[COMPUTE_WEIGHTED_DIFF] = "wdiff",
};

static int compute;

static int setup_compute_opt_wdiff(char *opt)
{
	char *w1_str = opt;
	char *w2_str;

	int ret = -EINVAL;

	if (!opt)
		goto out;

	w2_str = strchr(opt, ',');
	if (!w2_str)
		goto out;

	*w2_str++ = 0x0;
	if (!*w2_str)
		goto out;

	compute_wdiff_w1 = strtol(w1_str, NULL, 10);
	compute_wdiff_w2 = strtol(w2_str, NULL, 10);

	if (!compute_wdiff_w1 || !compute_wdiff_w2)
		goto out;

	pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
		  compute_wdiff_w1, compute_wdiff_w2);

	ret = 0;

 out:
	if (ret)
		pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n");

	return ret;
}

static int setup_compute_opt(char *opt)
{
	if (compute == COMPUTE_WEIGHTED_DIFF)
		return setup_compute_opt_wdiff(opt);

	if (opt) {
		pr_err("Failed: extra option specified '%s'", opt);
		return -EINVAL;
	}

	return 0;
}

static int setup_compute(const struct option *opt, const char *str,
			 int unset __maybe_unused)
{
	int *cp = (int *) opt->value;
	char *cstr = (char *) str;
	char buf[50];
	unsigned i;
	char *option;

	if (!str) {
		*cp = COMPUTE_DELTA;
		return 0;
	}

	if (*str == '+') {
		sort_compute = true;
		cstr = (char *) ++str;
		if (!*str)
			return 0;
	}

	option = strchr(str, ':');
	if (option) {
		unsigned len = option++ - str;

		/*
		 * The str data are not writeable, so we need
		 * to use another buffer.
		 */

		/* No option value is longer. */
		if (len >= sizeof(buf))
			return -EINVAL;

		strncpy(buf, str, len);
		buf[len] = 0x0;
		cstr = buf;
	}

	for (i = 0; i < COMPUTE_MAX; i++)
		if (!strcmp(cstr, compute_names[i])) {
			*cp = i;
			return setup_compute_opt(option);
		}

	pr_err("Failed: '%s' is not computation method "
	       "(use 'delta','ratio' or 'wdiff')\n", str);
	return -EINVAL;
}

double perf_diff__period_percent(struct hist_entry *he, u64 period)
{
	u64 total = he->hists->stats.total_period;
	return (period * 100.0) / total;
}

double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair)
{
	double new_percent = perf_diff__period_percent(he, he->stat.period);
	double old_percent = perf_diff__period_percent(pair, pair->stat.period);

	he->diff.period_ratio_delta = new_percent - old_percent;
	he->diff.computed = true;
	return he->diff.period_ratio_delta;
}

double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair)
{
	double new_period = he->stat.period;
	double old_period = pair->stat.period;

	he->diff.computed = true;
	he->diff.period_ratio = new_period / old_period;
	return he->diff.period_ratio;
}

s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
{
	u64 new_period = he->stat.period;
	u64 old_period = pair->stat.period;

	he->diff.computed = true;
	he->diff.wdiff = new_period * compute_wdiff_w2 -
			 old_period * compute_wdiff_w1;

	return he->diff.wdiff;
}

static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
			 char *buf, size_t size)
{
	return scnprintf(buf, size,
			 "(%" PRIu64 " * 100 / %" PRIu64 ") - "
			 "(%" PRIu64 " * 100 / %" PRIu64 ")",
			  he->stat.period, he->hists->stats.total_period,
			  pair->stat.period, pair->hists->stats.total_period);
}

static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
			 char *buf, size_t size)
{
	double new_period = he->stat.period;
	double old_period = pair->stat.period;

	return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
}

static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
			 char *buf, size_t size)
{
	u64 new_period = he->stat.period;
	u64 old_period = pair->stat.period;

	return scnprintf(buf, size,
		  "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
		  new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
}

int perf_diff__formula(struct hist_entry *he, struct hist_entry *pair,
		       char *buf, size_t size)
{
	switch (compute) {
	case COMPUTE_DELTA:
		return formula_delta(he, pair, buf, size);
	case COMPUTE_RATIO:
		return formula_ratio(he, pair, buf, size);
	case COMPUTE_WEIGHTED_DIFF:
		return formula_wdiff(he, pair, buf, size);
	default:
		BUG_ON(1);
	}

	return -1;
}

static int hists__add_entry(struct hists *self,
			    struct addr_location *al, u64 period)
{
	if (__hists__add_entry(self, al, NULL, period) != NULL)
		return 0;
	return -ENOMEM;
}

static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
				      union perf_event *event,
				      struct perf_sample *sample,
				      struct perf_evsel *evsel,
				      struct machine *machine)
{
	struct addr_location al;

	if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
		pr_warning("problem processing %d event, skipping it.\n",
			   event->header.type);
		return -1;
	}

	if (al.filtered)
		return 0;

	if (hists__add_entry(&evsel->hists, &al, sample->period)) {
		pr_warning("problem incrementing symbol period, skipping event\n");
		return -1;
	}

	evsel->hists.stats.total_period += sample->period;
	return 0;
}

static struct perf_tool tool = {
	.sample	= diff__process_sample_event,
	.mmap	= perf_event__process_mmap,
	.comm	= perf_event__process_comm,
	.exit	= perf_event__process_exit,
	.fork	= perf_event__process_fork,
	.lost	= perf_event__process_lost,
	.ordered_samples = true,
	.ordering_requires_timestamps = true,
};

static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
				      struct perf_evlist *evlist)
{
	struct perf_evsel *e;

	list_for_each_entry(e, &evlist->entries, node)
		if (perf_evsel__match2(evsel, e))
			return e;

	return NULL;
}

static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
{
	struct perf_evsel *evsel;

	list_for_each_entry(evsel, &evlist->entries, node) {
		struct hists *hists = &evsel->hists;

		hists__collapse_resort(hists);
	}
}

static void hists__baseline_only(struct hists *hists)
{
	struct rb_root *root;
	struct rb_node *next;

	if (sort__need_collapse)
		root = &hists->entries_collapsed;
	else
		root = hists->entries_in;

	next = rb_first(root);
	while (next != NULL) {
		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);

		next = rb_next(&he->rb_node_in);
		if (!hist_entry__next_pair(he)) {
			rb_erase(&he->rb_node_in, root);
			hist_entry__free(he);
		}
	}
}

static void hists__precompute(struct hists *hists)
{
	struct rb_node *next = rb_first(&hists->entries);

	while (next != NULL) {
		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
		struct hist_entry *pair = hist_entry__next_pair(he);

		next = rb_next(&he->rb_node);
		if (!pair)
			continue;

		switch (compute) {
		case COMPUTE_DELTA:
			perf_diff__compute_delta(he, pair);
			break;
		case COMPUTE_RATIO:
			perf_diff__compute_ratio(he, pair);
			break;
		case COMPUTE_WEIGHTED_DIFF:
			perf_diff__compute_wdiff(he, pair);
			break;
		default:
			BUG_ON(1);
		}
	}
}

static int64_t cmp_doubles(double l, double r)
{
	if (l > r)
		return -1;
	else if (l < r)
		return 1;
	else
		return 0;
}

static int64_t
hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
			int c)
{
	switch (c) {
	case COMPUTE_DELTA:
	{
		double l = left->diff.period_ratio_delta;
		double r = right->diff.period_ratio_delta;

		return cmp_doubles(l, r);
	}
	case COMPUTE_RATIO:
	{
		double l = left->diff.period_ratio;
		double r = right->diff.period_ratio;

		return cmp_doubles(l, r);
	}
	case COMPUTE_WEIGHTED_DIFF:
	{
		s64 l = left->diff.wdiff;
		s64 r = right->diff.wdiff;

		return r - l;
	}
	default:
		BUG_ON(1);
	}

	return 0;
}

static void insert_hist_entry_by_compute(struct rb_root *root,
					 struct hist_entry *he,
					 int c)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct hist_entry *iter;

	while (*p != NULL) {
		parent = *p;
		iter = rb_entry(parent, struct hist_entry, rb_node);
		if (hist_entry__cmp_compute(he, iter, c) < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&he->rb_node, parent, p);
	rb_insert_color(&he->rb_node, root);
}

static void hists__compute_resort(struct hists *hists)
{
	struct rb_root *root;
	struct rb_node *next;

	if (sort__need_collapse)
		root = &hists->entries_collapsed;
	else
		root = hists->entries_in;

	hists->entries = RB_ROOT;
	next = rb_first(root);

	hists->nr_entries = 0;
	hists->stats.total_period = 0;
	hists__reset_col_len(hists);

	while (next != NULL) {
		struct hist_entry *he;

		he = rb_entry(next, struct hist_entry, rb_node_in);
		next = rb_next(&he->rb_node_in);

		insert_hist_entry_by_compute(&hists->entries, he, compute);
		hists__inc_nr_entries(hists, he);
	}
}

static void hists__process(struct hists *old, struct hists *new)
{
	hists__match(new, old);

	if (show_baseline_only)
		hists__baseline_only(new);
	else
		hists__link(new, old);

	if (sort_compute) {
		hists__precompute(new);
		hists__compute_resort(new);
	} else {
		hists__output_resort(new);
	}

	hists__fprintf(new, true, 0, 0, stdout);
}

static int __cmd_diff(void)
{
	int ret, i;
#define older (session[0])
#define newer (session[1])
	struct perf_session *session[2];
	struct perf_evlist *evlist_new, *evlist_old;
	struct perf_evsel *evsel;
	bool first = true;

	older = perf_session__new(input_old, O_RDONLY, force, false,
				  &tool);
	newer = perf_session__new(input_new, O_RDONLY, force, false,
				  &tool);
	if (session[0] == NULL || session[1] == NULL)
		return -ENOMEM;

	for (i = 0; i < 2; ++i) {
		ret = perf_session__process_events(session[i], &tool);
		if (ret)
			goto out_delete;
	}

	evlist_old = older->evlist;
	evlist_new = newer->evlist;

	perf_evlist__collapse_resort(evlist_old);
	perf_evlist__collapse_resort(evlist_new);

	list_for_each_entry(evsel, &evlist_new->entries, node) {
		struct perf_evsel *evsel_old;

		evsel_old = evsel_match(evsel, evlist_old);
		if (!evsel_old)
			continue;

		fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
			perf_evsel__name(evsel));

		first = false;

		hists__process(&evsel_old->hists, &evsel->hists);
	}

out_delete:
	for (i = 0; i < 2; ++i)
		perf_session__delete(session[i]);
	return ret;
#undef older
#undef newer
}

static const char * const diff_usage[] = {
	"perf diff [<options>] [old_file] [new_file]",
	NULL,
};

static const struct option options[] = {
	OPT_INCR('v', "verbose", &verbose,
		    "be more verbose (show symbol address, etc)"),
	OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
		    "Show only items with match in baseline"),
	OPT_CALLBACK('c', "compute", &compute,
		     "delta,ratio,wdiff:w1,w2 (default delta)",
		     "Entries differential computation selection",
		     setup_compute),
	OPT_BOOLEAN('p', "period", &show_period,
		    "Show period values."),
	OPT_BOOLEAN('F', "formula", &show_formula,
		    "Show formula."),
	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
		    "dump raw trace in ASCII"),
	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
		    "load module symbols - WARNING: use only with -k and LIVE kernel"),
	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
		   "only consider symbols in these dsos"),
	OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
		   "only consider symbols in these comms"),
	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
		   "only consider these symbols"),
	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
		   "sort by key(s): pid, comm, dso, symbol, parent"),
	OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
		   "separator for columns, no spaces will be added between "
		   "columns '.' is reserved."),
	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
		    "Look for files with symbols relative to this directory"),
	OPT_END()
};

static void ui_init(void)
{
	/*
	 * Display baseline/delta/ratio
	 * formula/periods columns.
	 */
	perf_hpp__column_enable(PERF_HPP__BASELINE);

	switch (compute) {
	case COMPUTE_DELTA:
		perf_hpp__column_enable(PERF_HPP__DELTA);
		break;
	case COMPUTE_RATIO:
		perf_hpp__column_enable(PERF_HPP__RATIO);
		break;
	case COMPUTE_WEIGHTED_DIFF:
		perf_hpp__column_enable(PERF_HPP__WEIGHTED_DIFF);
		break;
	default:
		BUG_ON(1);
	};

	if (show_formula)
		perf_hpp__column_enable(PERF_HPP__FORMULA);

	if (show_period) {
		perf_hpp__column_enable(PERF_HPP__PERIOD);
		perf_hpp__column_enable(PERF_HPP__PERIOD_BASELINE);
	}
}

int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
{
	sort_order = diff__default_sort_order;
	argc = parse_options(argc, argv, options, diff_usage, 0);
	if (argc) {
		if (argc > 2)
			usage_with_options(diff_usage, options);
		if (argc == 2) {
			input_old = argv[0];
			input_new = argv[1];
		} else
			input_new = argv[0];
	} else if (symbol_conf.default_guest_vmlinux_name ||
		   symbol_conf.default_guest_kallsyms) {
		input_old = "perf.data.host";
		input_new = "perf.data.guest";
	}

	symbol_conf.exclude_other = false;
	if (symbol__init() < 0)
		return -1;

	ui_init();

	setup_sorting(diff_usage, options);
	setup_pager();

	sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
	sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
	sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);

	return __cmd_diff();
}