summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/callchain.h
blob: 8f84423a75da74db5695c060cb13d15a8b503203 (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
#ifndef __PERF_CALLCHAIN_H
#define __PERF_CALLCHAIN_H

#include "../perf.h"
#include <linux/list.h>
#include <linux/rbtree.h>
#include "event.h"
#include "symbol.h"

enum perf_call_graph_mode {
	CALLCHAIN_NONE,
	CALLCHAIN_FP,
	CALLCHAIN_DWARF,
	CALLCHAIN_MAX
};

enum chain_mode {
	CHAIN_NONE,
	CHAIN_FLAT,
	CHAIN_GRAPH_ABS,
	CHAIN_GRAPH_REL
};

enum chain_order {
	ORDER_CALLER,
	ORDER_CALLEE
};

struct callchain_node {
	struct callchain_node	*parent;
	struct list_head	val;
	struct rb_node		rb_node_in; /* to insert nodes in an rbtree */
	struct rb_node		rb_node;    /* to sort nodes in an output tree */
	struct rb_root		rb_root_in; /* input tree of children */
	struct rb_root		rb_root;    /* sorted output tree of children */
	unsigned int		val_nr;
	u64			hit;
	u64			children_hit;
};

struct callchain_root {
	u64			max_depth;
	struct callchain_node	node;
};

struct callchain_param;

typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_root *,
				 u64, struct callchain_param *);

enum chain_key {
	CCKEY_FUNCTION,
	CCKEY_ADDRESS
};

struct callchain_param {
	enum chain_mode 	mode;
	u32			print_limit;
	double			min_percent;
	sort_chain_func_t	sort;
	enum chain_order	order;
	enum chain_key		key;
};

struct callchain_list {
	u64			ip;
	struct map_symbol	ms;
	struct list_head	list;
};

/*
 * A callchain cursor is a single linked list that
 * let one feed a callchain progressively.
 * It keeps persistent allocated entries to minimize
 * allocations.
 */
struct callchain_cursor_node {
	u64				ip;
	struct map			*map;
	struct symbol			*sym;
	struct callchain_cursor_node	*next;
};

struct callchain_cursor {
	u64				nr;
	struct callchain_cursor_node	*first;
	struct callchain_cursor_node	**last;
	u64				pos;
	struct callchain_cursor_node	*curr;
};

extern __thread struct callchain_cursor callchain_cursor;

static inline void callchain_init(struct callchain_root *root)
{
	INIT_LIST_HEAD(&root->node.val);

	root->node.parent = NULL;
	root->node.hit = 0;
	root->node.children_hit = 0;
	root->node.rb_root_in = RB_ROOT;
	root->max_depth = 0;
}

static inline u64 callchain_cumul_hits(struct callchain_node *node)
{
	return node->hit + node->children_hit;
}

int callchain_register_param(struct callchain_param *param);
int callchain_append(struct callchain_root *root,
		     struct callchain_cursor *cursor,
		     u64 period);

int callchain_merge(struct callchain_cursor *cursor,
		    struct callchain_root *dst, struct callchain_root *src);

/*
 * Initialize a cursor before adding entries inside, but keep
 * the previously allocated entries as a cache.
 */
static inline void callchain_cursor_reset(struct callchain_cursor *cursor)
{
	cursor->nr = 0;
	cursor->last = &cursor->first;
}

int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
			    struct map *map, struct symbol *sym);

/* Close a cursor writing session. Initialize for the reader */
static inline void callchain_cursor_commit(struct callchain_cursor *cursor)
{
	cursor->curr = cursor->first;
	cursor->pos = 0;
}

/* Cursor reading iteration helpers */
static inline struct callchain_cursor_node *
callchain_cursor_current(struct callchain_cursor *cursor)
{
	if (cursor->pos == cursor->nr)
		return NULL;

	return cursor->curr;
}

static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
{
	cursor->curr = cursor->curr->next;
	cursor->pos++;
}

struct option;
struct hist_entry;

int record_parse_callchain(const char *arg, struct record_opts *opts);
int record_parse_callchain_opt(const struct option *opt, const char *arg, int unset);
int record_callchain_opt(const struct option *opt, const char *arg, int unset);

int sample__resolve_callchain(struct perf_sample *sample, struct symbol **parent,
			      struct perf_evsel *evsel, struct addr_location *al,
			      int max_stack);
int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample);
int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node,
			bool hide_unresolved);

extern const char record_callchain_help[];
int parse_callchain_report_opt(const char *arg);

static inline void callchain_cursor_snapshot(struct callchain_cursor *dest,
					     struct callchain_cursor *src)
{
	*dest = *src;

	dest->first = src->curr;
	dest->nr -= src->pos;
}
#endif	/* __PERF_CALLCHAIN_H */