aboutsummaryrefslogtreecommitdiffstats
path: root/tools/perf/util/top.c
blob: 70a9c13f4ad5a3cbe8e9aecdfb61c701a400db9c (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
/*
 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Refactored from builtin-top.c, see that files for further copyright notes.
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */

#include "cpumap.h"
#include "event.h"
#include "evlist.h"
#include "evsel.h"
#include "parse-events.h"
#include "symbol.h"
#include "top.h"
#include <inttypes.h>

/*
 * Ordering weight: count-1 * count-2 * ... / count-n
 */
static double sym_weight(const struct sym_entry *sym, struct perf_top *top)
{
	double weight = sym->snap_count;
	int counter;

	if (!top->display_weighted)
		return weight;

	for (counter = 1; counter < top->evlist->nr_entries - 1; counter++)
		weight *= sym->count[counter];

	weight /= (sym->count[counter] + 1);

	return weight;
}

static void perf_top__remove_active_sym(struct perf_top *top, struct sym_entry *syme)
{
	pthread_mutex_lock(&top->active_symbols_lock);
	list_del_init(&syme->node);
	pthread_mutex_unlock(&top->active_symbols_lock);
}

static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
{
	struct rb_node **p = &tree->rb_node;
	struct rb_node *parent = NULL;
	struct sym_entry *iter;

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

		if (se->weight > iter->weight)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&se->rb_node, parent, p);
	rb_insert_color(&se->rb_node, tree);
}

size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)
{
	struct perf_evsel *counter;
	float samples_per_sec = top->samples / top->delay_secs;
	float ksamples_per_sec = top->kernel_samples / top->delay_secs;
	float esamples_percent = (100.0 * top->exact_samples) / top->samples;
	size_t ret = 0;

	if (!perf_guest) {
		ret = snprintf(bf, size,
			       "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%%"
			       "  exact: %4.1f%% [", samples_per_sec,
			       100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
					samples_per_sec)),
				esamples_percent);
	} else {
		float us_samples_per_sec = top->us_samples / top->delay_secs;
		float guest_kernel_samples_per_sec = top->guest_kernel_samples / top->delay_secs;
		float guest_us_samples_per_sec = top->guest_us_samples / top->delay_secs;

		ret = snprintf(bf, size,
			       "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% us:%4.1f%%"
			       " guest kernel:%4.1f%% guest us:%4.1f%%"
			       " exact: %4.1f%% [", samples_per_sec,
			       100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
						 samples_per_sec)),
			       100.0 - (100.0 * ((samples_per_sec - us_samples_per_sec) /
						 samples_per_sec)),
			       100.0 - (100.0 * ((samples_per_sec -
						  guest_kernel_samples_per_sec) /
						 samples_per_sec)),
			       100.0 - (100.0 * ((samples_per_sec -
						  guest_us_samples_per_sec) /
						 samples_per_sec)),
			       esamples_percent);
	}

	if (top->evlist->nr_entries == 1 || !top->display_weighted) {
		struct perf_evsel *first;
		first = list_entry(top->evlist->entries.next, struct perf_evsel, node);
		ret += snprintf(bf + ret, size - ret, "%" PRIu64 "%s ",
				(uint64_t)first->attr.sample_period,
				top->freq ? "Hz" : "");
	}

	if (!top->display_weighted) {
		ret += snprintf(bf + ret, size - ret, "%s",
				event_name(top->sym_evsel));
	} else list_for_each_entry(counter, &top->evlist->entries, node) {
		ret += snprintf(bf + ret, size - ret, "%s%s",
				counter->idx ? "/" : "", event_name(counter));
	}

	ret += snprintf(bf + ret, size - ret, "], ");

	if (top->target_pid != -1)
		ret += snprintf(bf + ret, size - ret, " (target_pid: %d",
				top->target_pid);
	else if (top->target_tid != -1)
		ret += snprintf(bf + ret, size - ret, " (target_tid: %d",
				top->target_tid);
	else
		ret += snprintf(bf + ret, size - ret, " (all");

	if (top->cpu_list)
		ret += snprintf(bf + ret, size - ret, ", CPU%s: %s)",
				top->evlist->cpus->nr > 1 ? "s" : "", top->cpu_list);
	else {
		if (top->target_tid != -1)
			ret += snprintf(bf + ret, size - ret, ")");
		else
			ret += snprintf(bf + ret, size - ret, ", %d CPU%s)",
					top->evlist->cpus->nr,
					top->evlist->cpus->nr > 1 ? "s" : "");
	}

	return ret;
}

void perf_top__reset_sample_counters(struct perf_top *top)
{
	top->samples = top->us_samples = top->kernel_samples =
	top->exact_samples = top->guest_kernel_samples =
	top->guest_us_samples = 0;
}

float perf_top__decay_samples(struct perf_top *top, struct rb_root *root)
{
	struct sym_entry *syme, *n;
	float sum_ksamples = 0.0;
	int snap = !top->display_weighted ? top->sym_counter : 0, j;

	/* Sort the active symbols */
	pthread_mutex_lock(&top->active_symbols_lock);
	syme = list_entry(top->active_symbols.next, struct sym_entry, node);
	pthread_mutex_unlock(&top->active_symbols_lock);

	top->rb_entries = 0;
	list_for_each_entry_safe_from(syme, n, &top->active_symbols, node) {
		syme->snap_count = syme->count[snap];
		if (syme->snap_count != 0) {

			if ((top->hide_user_symbols &&
			     syme->origin == PERF_RECORD_MISC_USER) ||
			    (top->hide_kernel_symbols &&
			     syme->origin == PERF_RECORD_MISC_KERNEL)) {
				perf_top__remove_active_sym(top, syme);
				continue;
			}
			syme->weight = sym_weight(syme, top);

			if ((int)syme->snap_count >= top->count_filter) {
				rb_insert_active_sym(root, syme);
				++top->rb_entries;
			}
			sum_ksamples += syme->snap_count;

			for (j = 0; j < top->evlist->nr_entries; j++)
				syme->count[j] = top->zero ? 0 : syme->count[j] * 7 / 8;
		} else
			perf_top__remove_active_sym(top, syme);
	}

	return sum_ksamples;
}

/*
 * Find the longest symbol name that will be displayed
 */
void perf_top__find_widths(struct perf_top *top, struct rb_root *root,
			   int *dso_width, int *dso_short_width, int *sym_width)
{
	struct rb_node *nd;
	int printed = 0;

	*sym_width = *dso_width = *dso_short_width = 0;

	for (nd = rb_first(root); nd; nd = rb_next(nd)) {
		struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node);
		struct symbol *sym = sym_entry__symbol(syme);

		if (++printed > top->print_entries ||
		    (int)syme->snap_count < top->count_filter)
			continue;

		if (syme->map->dso->long_name_len > *dso_width)
			*dso_width = syme->map->dso->long_name_len;

		if (syme->map->dso->short_name_len > *dso_short_width)
			*dso_short_width = syme->map->dso->short_name_len;

		if (sym->namelen > *sym_width)
			*sym_width = sym->namelen;
	}
}

Privacy Policy