summaryrefslogtreecommitdiff
path: root/tools/perf/util/thread.c
blob: 9e8995eaf2b61332e650fb2c4dfde6d615c6ae3e (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
#include "../perf.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "session.h"
#include "thread.h"
#include "util.h"
#include "debug.h"

void map_groups__init(struct map_groups *self)
{
	int i;
	for (i = 0; i < MAP__NR_TYPES; ++i) {
		self->maps[i] = RB_ROOT;
		INIT_LIST_HEAD(&self->removed_maps[i]);
	}
}

static struct thread *thread__new(pid_t pid)
{
	struct thread *self = zalloc(sizeof(*self));

	if (self != NULL) {
		map_groups__init(&self->mg);
		self->pid = pid;
		self->comm = malloc(32);
		if (self->comm)
			snprintf(self->comm, 32, ":%d", self->pid);
	}

	return self;
}

int thread__set_comm(struct thread *self, const char *comm)
{
	if (self->comm)
		free(self->comm);
	self->comm = strdup(comm);
	if (self->comm == NULL)
		return -ENOMEM;
	self->comm_set = true;
	return 0;
}

int thread__comm_len(struct thread *self)
{
	if (!self->comm_len) {
		if (!self->comm)
			return 0;
		self->comm_len = strlen(self->comm);
	}

	return self->comm_len;
}

static const char *map_type__name[MAP__NR_TYPES] = {
	[MAP__FUNCTION] = "Functions",
	[MAP__VARIABLE] = "Variables",
};

static size_t __map_groups__fprintf_maps(struct map_groups *self,
					 enum map_type type, FILE *fp)
{
	size_t printed = fprintf(fp, "%s:\n", map_type__name[type]);
	struct rb_node *nd;

	for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
		struct map *pos = rb_entry(nd, struct map, rb_node);
		printed += fprintf(fp, "Map:");
		printed += map__fprintf(pos, fp);
		if (verbose > 1) {
			printed += dso__fprintf(pos->dso, type, fp);
			printed += fprintf(fp, "--\n");
		}
	}

	return printed;
}

size_t map_groups__fprintf_maps(struct map_groups *self, FILE *fp)
{
	size_t printed = 0, i;
	for (i = 0; i < MAP__NR_TYPES; ++i)
		printed += __map_groups__fprintf_maps(self, i, fp);
	return printed;
}

static size_t __map_groups__fprintf_removed_maps(struct map_groups *self,
						 enum map_type type, FILE *fp)
{
	struct map *pos;
	size_t printed = 0;

	list_for_each_entry(pos, &self->removed_maps[type], node) {
		printed += fprintf(fp, "Map:");
		printed += map__fprintf(pos, fp);
		if (verbose > 1) {
			printed += dso__fprintf(pos->dso, type, fp);
			printed += fprintf(fp, "--\n");
		}
	}
	return printed;
}

static size_t map_groups__fprintf_removed_maps(struct map_groups *self, FILE *fp)
{
	size_t printed = 0, i;
	for (i = 0; i < MAP__NR_TYPES; ++i)
		printed += __map_groups__fprintf_removed_maps(self, i, fp);
	return printed;
}

static size_t map_groups__fprintf(struct map_groups *self, FILE *fp)
{
	size_t printed = map_groups__fprintf_maps(self, fp);
	printed += fprintf(fp, "Removed maps:\n");
	return printed + map_groups__fprintf_removed_maps(self, fp);
}

static size_t thread__fprintf(struct thread *self, FILE *fp)
{
	return fprintf(fp, "Thread %d %s\n", self->pid, self->comm) +
	       map_groups__fprintf(&self->mg, fp);
}

struct thread *perf_session__findnew(struct perf_session *self, pid_t pid)
{
	struct rb_node **p = &self->threads.rb_node;
	struct rb_node *parent = NULL;
	struct thread *th;

	/*
	 * Font-end cache - PID lookups come in blocks,
	 * so most of the time we dont have to look up
	 * the full rbtree:
	 */
	if (self->last_match && self->last_match->pid == pid)
		return self->last_match;

	while (*p != NULL) {
		parent = *p;
		th = rb_entry(parent, struct thread, rb_node);

		if (th->pid == pid) {
			self->last_match = th;
			return th;
		}

		if (pid < th->pid)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	th = thread__new(pid);
	if (th != NULL) {
		rb_link_node(&th->rb_node, parent, p);
		rb_insert_color(&th->rb_node, &self->threads);
		self->last_match = th;
	}

	return th;
}

static void map_groups__remove_overlappings(struct map_groups *self,
					    struct map *map)
{
	struct rb_root *root = &self->maps[map->type];
	struct rb_node *next = rb_first(root);

	while (next) {
		struct map *pos = rb_entry(next, struct map, rb_node);
		next = rb_next(&pos->rb_node);

		if (!map__overlap(pos, map))
			continue;

		if (verbose >= 2) {
			fputs("overlapping maps:\n", stderr);
			map__fprintf(map, stderr);
			map__fprintf(pos, stderr);
		}

		rb_erase(&pos->rb_node, root);
		/*
		 * We may have references to this map, for instance in some
		 * hist_entry instances, so just move them to a separate
		 * list.
		 */
		list_add_tail(&pos->node, &self->removed_maps[map->type]);
	}
}

void maps__insert(struct rb_root *maps, struct map *map)
{
	struct rb_node **p = &maps->rb_node;
	struct rb_node *parent = NULL;
	const u64 ip = map->start;
	struct map *m;

	while (*p != NULL) {
		parent = *p;
		m = rb_entry(parent, struct map, rb_node);
		if (ip < m->start)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&map->rb_node, parent, p);
	rb_insert_color(&map->rb_node, maps);
}

struct map *maps__find(struct rb_root *maps, u64 ip)
{
	struct rb_node **p = &maps->rb_node;
	struct rb_node *parent = NULL;
	struct map *m;

	while (*p != NULL) {
		parent = *p;
		m = rb_entry(parent, struct map, rb_node);
		if (ip < m->start)
			p = &(*p)->rb_left;
		else if (ip > m->end)
			p = &(*p)->rb_right;
		else
			return m;
	}

	return NULL;
}

void thread__insert_map(struct thread *self, struct map *map)
{
	map_groups__remove_overlappings(&self->mg, map);
	map_groups__insert(&self->mg, map);
}

/*
 * XXX This should not really _copy_ te maps, but refcount them.
 */
static int map_groups__clone(struct map_groups *self,
			     struct map_groups *parent, enum map_type type)
{
	struct rb_node *nd;
	for (nd = rb_first(&parent->maps[type]); nd; nd = rb_next(nd)) {
		struct map *map = rb_entry(nd, struct map, rb_node);
		struct map *new = map__clone(map);
		if (new == NULL)
			return -ENOMEM;
		map_groups__insert(self, new);
	}
	return 0;
}

int thread__fork(struct thread *self, struct thread *parent)
{
	int i;

	if (parent->comm_set) {
		if (self->comm)
			free(self->comm);
		self->comm = strdup(parent->comm);
		if (!self->comm)
			return -ENOMEM;
		self->comm_set = true;
	}

	for (i = 0; i < MAP__NR_TYPES; ++i)
		if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
			return -ENOMEM;
	return 0;
}

size_t perf_session__fprintf(struct perf_session *self, FILE *fp)
{
	size_t ret = 0;
	struct rb_node *nd;

	for (nd = rb_first(&self->threads); nd; nd = rb_next(nd)) {
		struct thread *pos = rb_entry(nd, struct thread, rb_node);

		ret += thread__fprintf(pos, fp);
	}

	return ret;
}

struct symbol *map_groups__find_symbol(struct map_groups *self,
				       enum map_type type, u64 addr,
				       symbol_filter_t filter)
{
	struct map *map = map_groups__find(self, type, addr);

	if (map != NULL)
		return map__find_symbol(map, map->map_ip(map, addr), filter);

	return NULL;
}