aboutsummaryrefslogtreecommitdiff
path: root/tools/perf/util/hist.c
blob: 040f34c79a53e8707debbb71798b504e5115a58c (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
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
#include "annotate.h"
#include "util.h"
#include "build-id.h"
#include "hist.h"
#include "session.h"
#include "sort.h"
#include <math.h>

static bool hists__filter_entry_by_dso(struct hists *hists,
				       struct hist_entry *he);
static bool hists__filter_entry_by_thread(struct hists *hists,
					  struct hist_entry *he);
static bool hists__filter_entry_by_symbol(struct hists *hists,
					  struct hist_entry *he);

enum hist_filter {
	HIST_FILTER__DSO,
	HIST_FILTER__THREAD,
	HIST_FILTER__PARENT,
	HIST_FILTER__SYMBOL,
};

struct callchain_param	callchain_param = {
	.mode	= CHAIN_GRAPH_REL,
	.min_percent = 0.5,
	.order  = ORDER_CALLEE
};

u16 hists__col_len(struct hists *hists, enum hist_column col)
{
	return hists->col_len[col];
}

void hists__set_col_len(struct hists *hists, enum hist_column col, u16 len)
{
	hists->col_len[col] = len;
}

bool hists__new_col_len(struct hists *hists, enum hist_column col, u16 len)
{
	if (len > hists__col_len(hists, col)) {
		hists__set_col_len(hists, col, len);
		return true;
	}
	return false;
}

void hists__reset_col_len(struct hists *hists)
{
	enum hist_column col;

	for (col = 0; col < HISTC_NR_COLS; ++col)
		hists__set_col_len(hists, col, 0);
}

static void hists__set_unres_dso_col_len(struct hists *hists, int dso)
{
	const unsigned int unresolved_col_width = BITS_PER_LONG / 4;

	if (hists__col_len(hists, dso) < unresolved_col_width &&
	    !symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
	    !symbol_conf.dso_list)
		hists__set_col_len(hists, dso, unresolved_col_width);
}

void hists__calc_col_len(struct hists *hists, struct hist_entry *h)
{
	const unsigned int unresolved_col_width = BITS_PER_LONG / 4;
	u16 len;

	if (h->ms.sym)
		hists__new_col_len(hists, HISTC_SYMBOL, h->ms.sym->namelen + 4);
	else
		hists__set_unres_dso_col_len(hists, HISTC_DSO);

	len = thread__comm_len(h->thread);
	if (hists__new_col_len(hists, HISTC_COMM, len))
		hists__set_col_len(hists, HISTC_THREAD, len + 6);

	if (h->ms.map) {
		len = dso__name_len(h->ms.map->dso);
		hists__new_col_len(hists, HISTC_DSO, len);
	}

	if (h->branch_info) {
		int symlen;
		/*
		 * +4 accounts for '[x] ' priv level info
		 * +2 account of 0x prefix on raw addresses
		 */
		if (h->branch_info->from.sym) {
			symlen = (int)h->branch_info->from.sym->namelen + 4;
			hists__new_col_len(hists, HISTC_SYMBOL_FROM, symlen);

			symlen = dso__name_len(h->branch_info->from.map->dso);
			hists__new_col_len(hists, HISTC_DSO_FROM, symlen);
		} else {
			symlen = unresolved_col_width + 4 + 2;
			hists__new_col_len(hists, HISTC_SYMBOL_FROM, symlen);
			hists__set_unres_dso_col_len(hists, HISTC_DSO_FROM);
		}

		if (h->branch_info->to.sym) {
			symlen = (int)h->branch_info->to.sym->namelen + 4;
			hists__new_col_len(hists, HISTC_SYMBOL_TO, symlen);

			symlen = dso__name_len(h->branch_info->to.map->dso);
			hists__new_col_len(hists, HISTC_DSO_TO, symlen);
		} else {
			symlen = unresolved_col_width + 4 + 2;
			hists__new_col_len(hists, HISTC_SYMBOL_TO, symlen);
			hists__set_unres_dso_col_len(hists, HISTC_DSO_TO);
		}
	}
}

void hists__output_recalc_col_len(struct hists *hists, int max_rows)
{
	struct rb_node *next = rb_first(&hists->entries);
	struct hist_entry *n;
	int row = 0;

	hists__reset_col_len(hists);

	while (next && row++ < max_rows) {
		n = rb_entry(next, struct hist_entry, rb_node);
		if (!n->filtered)
			hists__calc_col_len(hists, n);
		next = rb_next(&n->rb_node);
	}
}

static void hist_entry__add_cpumode_period(struct hist_entry *he,
					   unsigned int cpumode, u64 period)
{
	switch (cpumode) {
	case PERF_RECORD_MISC_KERNEL:
		he->period_sys += period;
		break;
	case PERF_RECORD_MISC_USER:
		he->period_us += period;
		break;
	case PERF_RECORD_MISC_GUEST_KERNEL:
		he->period_guest_sys += period;
		break;
	case PERF_RECORD_MISC_GUEST_USER:
		he->period_guest_us += period;
		break;
	default:
		break;
	}
}

static void hist_entry__decay(struct hist_entry *he)
{
	he->period = (he->period * 7) / 8;
	he->nr_events = (he->nr_events * 7) / 8;
}

static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
{
	u64 prev_period = he->period;

	if (prev_period == 0)
		return true;

	hist_entry__decay(he);

	if (!he->filtered)
		hists->stats.total_period -= prev_period - he->period;

	return he->period == 0;
}

static void __hists__decay_entries(struct hists *hists, bool zap_user,
				   bool zap_kernel, bool threaded)
{
	struct rb_node *next = rb_first(&hists->entries);
	struct hist_entry *n;

	while (next) {
		n = rb_entry(next, struct hist_entry, rb_node);
		next = rb_next(&n->rb_node);
		/*
		 * We may be annotating this, for instance, so keep it here in
		 * case some it gets new samples, we'll eventually free it when
		 * the user stops browsing and it agains gets fully decayed.
		 */
		if (((zap_user && n->level == '.') ||
		     (zap_kernel && n->level != '.') ||
		     hists__decay_entry(hists, n)) &&
		    !n->used) {
			rb_erase(&n->rb_node, &hists->entries);

			if (sort__need_collapse || threaded)
				rb_erase(&n->rb_node_in, &hists->entries_collapsed);

			hist_entry__free(n);
			--hists->nr_entries;
		}
	}
}

void hists__decay_entries(struct hists *hists, bool zap_user, bool zap_kernel)
{
	return __hists__decay_entries(hists, zap_user, zap_kernel, false);
}

void hists__decay_entries_threaded(struct hists *hists,
				   bool zap_user, bool zap_kernel)
{
	return __hists__decay_entries(hists, zap_user, zap_kernel, true);
}

/*
 * histogram, sorted on item, collects periods
 */

static struct hist_entry *hist_entry__new(struct hist_entry *template)
{
	size_t callchain_size = symbol_conf.use_callchain ? sizeof(struct callchain_root) : 0;
	struct hist_entry *he = malloc(sizeof(*he) + callchain_size);

	if (he != NULL) {
		*he = *template;
		he->nr_events = 1;
		if (he->ms.map)
			he->ms.map->referenced = true;
		if (symbol_conf.use_callchain)
			callchain_init(he->callchain);
	}

	return he;
}

static void hists__inc_nr_entries(struct hists *hists, struct hist_entry *h)
{
	if (!h->filtered) {
		hists__calc_col_len(hists, h);
		++hists->nr_entries;
		hists->stats.total_period += h->period;
	}
}

static u8 symbol__parent_filter(const struct symbol *parent)
{
	if (symbol_conf.exclude_other && parent == NULL)
		return 1 << HIST_FILTER__PARENT;
	return 0;
}

static struct hist_entry *add_hist_entry(struct hists *hists,
				      struct hist_entry *entry,
				      struct addr_location *al,
				      u64 period)
{
	struct rb_node **p;
	struct rb_node *parent = NULL;
	struct hist_entry *he;
	int cmp;

	pthread_mutex_lock(&hists->lock);

	p = &hists->entries_in->rb_node;

	while (*p != NULL) {
		parent = *p;
		he = rb_entry(parent, struct hist_entry, rb_node_in);

		cmp = hist_entry__cmp(entry, he);

		if (!cmp) {
			he->period += period;
			++he->nr_events;

			/* If the map of an existing hist_entry has
			 * become out-of-date due to an exec() or
			 * similar, update it.  Otherwise we will
			 * mis-adjust symbol addresses when computing
			 * the history counter to increment.
			 */
			if (he->ms.map != entry->ms.map) {
				he->ms.map = entry->ms.map;
				if (he->ms.map)
					he->ms.map->referenced = true;
			}
			goto out;
		}

		if (cmp < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	he = hist_entry__new(entry);
	if (!he)
		goto out_unlock;

	rb_link_node(&he->rb_node_in, parent, p);
	rb_insert_color(&he->rb_node_in, hists->entries_in);
out:
	hist_entry__add_cpumode_period(he, al->cpumode, period);
out_unlock:
	pthread_mutex_unlock(&hists->lock);
	return he;
}

struct hist_entry *__hists__add_branch_entry(struct hists *self,
					     struct addr_location *al,
					     struct symbol *sym_parent,
					     struct branch_info *bi,
					     u64 period)
{
	struct hist_entry entry = {
		.thread	= al->thread,
		.ms = {
			.map	= bi->to.map,
			.sym	= bi->to.sym,
		},
		.cpu	= al->cpu,
		.ip	= bi->to.addr,
		.level	= al->level,
		.period	= period,
		.parent = sym_parent,
		.filtered = symbol__parent_filter(sym_parent),
		.branch_info = bi,
		.hists	= self,
	};

	return add_hist_entry(self, &entry, al, period);
}

struct hist_entry *__hists__add_entry(struct hists *self,
				      struct addr_location *al,
				      struct symbol *sym_parent, u64 period)
{
	struct hist_entry entry = {
		.thread	= al->thread,
		.ms = {
			.map	= al->map,
			.sym	= al->sym,
		},
		.cpu	= al->cpu,
		.ip	= al->addr,
		.level	= al->level,
		.period	= period,
		.parent = sym_parent,
		.filtered = symbol__parent_filter(sym_parent),
		.hists	= self,
	};

	return add_hist_entry(self, &entry, al, period);
}

int64_t
hist_entry__cmp(struct hist_entry *left, struct hist_entry *right)
{
	struct sort_entry *se;
	int64_t cmp = 0;

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		cmp = se->se_cmp(left, right);
		if (cmp)
			break;
	}

	return cmp;
}

int64_t
hist_entry__collapse(struct hist_entry *left, struct hist_entry *right)
{
	struct sort_entry *se;
	int64_t cmp = 0;

	list_for_each_entry(se, &hist_entry__sort_list, list) {
		int64_t (*f)(struct hist_entry *, struct hist_entry *);

		f = se->se_collapse ?: se->se_cmp;

		cmp = f(left, right);
		if (cmp)
			break;
	}

	return cmp;
}

void hist_entry__free(struct hist_entry *he)
{
	free(he);
}

/*
 * collapse the histogram
 */

static bool hists__collapse_insert_entry(struct hists *hists __maybe_unused,
					 struct rb_root *root,
					 struct hist_entry *he)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct hist_entry *iter;
	int64_t cmp;

	while (*p != NULL) {
		parent = *p;
		iter = rb_entry(parent, struct hist_entry, rb_node_in);

		cmp = hist_entry__collapse(iter, he);

		if (!cmp) {
			iter->period		+= he->period;
			iter->period_sys	+= he->period_sys;
			iter->period_us		+= he->period_us;
			iter->period_guest_sys	+= he->period_guest_sys;
			iter->period_guest_us	+= he->period_guest_us;
			iter->nr_events		+= he->nr_events;

			if (symbol_conf.use_callchain) {
				callchain_cursor_reset(&callchain_cursor);
				callchain_merge(&callchain_cursor,
						iter->callchain,
						he->callchain);
			}
			hist_entry__free(he);
			return false;
		}

		if (cmp < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&he->rb_node_in, parent, p);
	rb_insert_color(&he->rb_node_in, root);
	return true;
}

static struct rb_root *hists__get_rotate_entries_in(struct hists *hists)
{
	struct rb_root *root;

	pthread_mutex_lock(&hists->lock);

	root = hists->entries_in;
	if (++hists->entries_in > &hists->entries_in_array[1])
		hists->entries_in = &hists->entries_in_array[0];

	pthread_mutex_unlock(&hists->lock);

	return root;
}

static void hists__apply_filters(struct hists *hists, struct hist_entry *he)
{
	hists__filter_entry_by_dso(hists, he);
	hists__filter_entry_by_thread(hists, he);
	hists__filter_entry_by_symbol(hists, he);
}

static void __hists__collapse_resort(struct hists *hists, bool threaded)
{
	struct rb_root *root;
	struct rb_node *next;
	struct hist_entry *n;

	if (!sort__need_collapse && !threaded)
		return;

	root = hists__get_rotate_entries_in(hists);
	next = rb_first(root);

	while (next) {
		n = rb_entry(next, struct hist_entry, rb_node_in);
		next = rb_next(&n->rb_node_in);

		rb_erase(&n->rb_node_in, root);
		if (hists__collapse_insert_entry(hists, &hists->entries_collapsed, n)) {
			/*
			 * If it wasn't combined with one of the entries already
			 * collapsed, we need to apply the filters that may have
			 * been set by, say, the hist_browser.
			 */
			hists__apply_filters(hists, n);
		}
	}
}

void hists__collapse_resort(struct hists *hists)
{
	return __hists__collapse_resort(hists, false);
}

void hists__collapse_resort_threaded(struct hists *hists)
{
	return __hists__collapse_resort(hists, true);
}

/*
 * reverse the map, sort on period.
 */

static void __hists__insert_output_entry(struct rb_root *entries,
					 struct hist_entry *he,
					 u64 min_callchain_hits)
{
	struct rb_node **p = &entries->rb_node;
	struct rb_node *parent = NULL;
	struct hist_entry *iter;

	if (symbol_conf.use_callchain)
		callchain_param.sort(&he->sorted_chain, he->callchain,
				      min_callchain_hits, &callchain_param);

	while (*p != NULL) {
		parent = *p;
		iter = rb_entry(parent, struct hist_entry, rb_node);

		if (he->period > iter->period)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

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

static void __hists__output_resort(struct hists *hists, bool threaded)
{
	struct rb_root *root;
	struct rb_node *next;
	struct hist_entry *n;
	u64 min_callchain_hits;

	min_callchain_hits = hists->stats.total_period * (callchain_param.min_percent / 100);

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

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

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

	while (next) {
		n = rb_entry(next, struct hist_entry, rb_node_in);
		next = rb_next(&n->rb_node_in);

		__hists__insert_output_entry(&hists->entries, n, min_callchain_hits);
		hists__inc_nr_entries(hists, n);
	}
}

void hists__output_resort(struct hists *hists)
{
	return __hists__output_resort(hists, false);
}

void hists__output_resort_threaded(struct hists *hists)
{
	return __hists__output_resort(hists, true);
}

static void hists__remove_entry_filter(struct hists *hists, struct hist_entry *h,
				       enum hist_filter filter)
{
	h->filtered &= ~(1 << filter);
	if (h->filtered)
		return;

	++hists->nr_entries;
	if (h->ms.unfolded)
		hists->nr_entries += h->nr_rows;
	h->row_offset = 0;
	hists->stats.total_period += h->period;
	hists->stats.nr_events[PERF_RECORD_SAMPLE] += h->nr_events;

	hists__calc_col_len(hists, h);
}


static bool hists__filter_entry_by_dso(struct hists *hists,
				       struct hist_entry *he)
{
	if (hists->dso_filter != NULL &&
	    (he->ms.map == NULL || he->ms.map->dso != hists->dso_filter)) {
		he->filtered |= (1 << HIST_FILTER__DSO);
		return true;
	}

	return false;
}

void hists__filter_by_dso(struct hists *hists)
{
	struct rb_node *nd;

	hists->nr_entries = hists->stats.total_period = 0;
	hists->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
	hists__reset_col_len(hists);

	for (nd = rb_first(&hists->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);

		if (symbol_conf.exclude_other && !h->parent)
			continue;

		if (hists__filter_entry_by_dso(hists, h))
			continue;

		hists__remove_entry_filter(hists, h, HIST_FILTER__DSO);
	}
}

static bool hists__filter_entry_by_thread(struct hists *hists,
					  struct hist_entry *he)
{
	if (hists->thread_filter != NULL &&
	    he->thread != hists->thread_filter) {
		he->filtered |= (1 << HIST_FILTER__THREAD);
		return true;
	}

	return false;
}

void hists__filter_by_thread(struct hists *hists)
{
	struct rb_node *nd;

	hists->nr_entries = hists->stats.total_period = 0;
	hists->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
	hists__reset_col_len(hists);

	for (nd = rb_first(&hists->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);

		if (hists__filter_entry_by_thread(hists, h))
			continue;

		hists__remove_entry_filter(hists, h, HIST_FILTER__THREAD);
	}
}

static bool hists__filter_entry_by_symbol(struct hists *hists,
					  struct hist_entry *he)
{
	if (hists->symbol_filter_str != NULL &&
	    (!he->ms.sym || strstr(he->ms.sym->name,
				   hists->symbol_filter_str) == NULL)) {
		he->filtered |= (1 << HIST_FILTER__SYMBOL);
		return true;
	}

	return false;
}

void hists__filter_by_symbol(struct hists *hists)
{
	struct rb_node *nd;

	hists->nr_entries = hists->stats.total_period = 0;
	hists->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
	hists__reset_col_len(hists);

	for (nd = rb_first(&hists->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);

		if (hists__filter_entry_by_symbol(hists, h))
			continue;

		hists__remove_entry_filter(hists, h, HIST_FILTER__SYMBOL);
	}
}

int hist_entry__inc_addr_samples(struct hist_entry *he, int evidx, u64 ip)
{
	return symbol__inc_addr_samples(he->ms.sym, he->ms.map, evidx, ip);
}

int hist_entry__annotate(struct hist_entry *he, size_t privsize)
{
	return symbol__annotate(he->ms.sym, he->ms.map, privsize);
}

void hists__inc_nr_events(struct hists *hists, u32 type)
{
	++hists->stats.nr_events[0];
	++hists->stats.nr_events[type];
}