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Linux kernel mirror (for testing)
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linux
1#ifndef __PERF_CALLCHAIN_H
2#define __PERF_CALLCHAIN_H
3
4#include "../perf.h"
5#include <linux/list.h>
6#include <linux/rbtree.h>
7#include "event.h"
8#include "symbol.h"
9
10enum chain_mode {
11 CHAIN_NONE,
12 CHAIN_FLAT,
13 CHAIN_GRAPH_ABS,
14 CHAIN_GRAPH_REL
15};
16
17enum chain_order {
18 ORDER_CALLER,
19 ORDER_CALLEE
20};
21
22struct callchain_node {
23 struct callchain_node *parent;
24 struct list_head siblings;
25 struct list_head children;
26 struct list_head val;
27 struct rb_node rb_node; /* to sort nodes in an rbtree */
28 struct rb_root rb_root; /* sorted tree of children */
29 unsigned int val_nr;
30 u64 hit;
31 u64 children_hit;
32};
33
34struct callchain_root {
35 u64 max_depth;
36 struct callchain_node node;
37};
38
39struct callchain_param;
40
41typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_root *,
42 u64, struct callchain_param *);
43
44struct callchain_param {
45 enum chain_mode mode;
46 u32 print_limit;
47 double min_percent;
48 sort_chain_func_t sort;
49 enum chain_order order;
50};
51
52struct callchain_list {
53 u64 ip;
54 struct map_symbol ms;
55 struct list_head list;
56};
57
58/*
59 * A callchain cursor is a single linked list that
60 * let one feed a callchain progressively.
61 * It keeps persitent allocated entries to minimize
62 * allocations.
63 */
64struct callchain_cursor_node {
65 u64 ip;
66 struct map *map;
67 struct symbol *sym;
68 struct callchain_cursor_node *next;
69};
70
71struct callchain_cursor {
72 u64 nr;
73 struct callchain_cursor_node *first;
74 struct callchain_cursor_node **last;
75 u64 pos;
76 struct callchain_cursor_node *curr;
77};
78
79static inline void callchain_init(struct callchain_root *root)
80{
81 INIT_LIST_HEAD(&root->node.siblings);
82 INIT_LIST_HEAD(&root->node.children);
83 INIT_LIST_HEAD(&root->node.val);
84
85 root->node.parent = NULL;
86 root->node.hit = 0;
87 root->node.children_hit = 0;
88 root->max_depth = 0;
89}
90
91static inline u64 callchain_cumul_hits(struct callchain_node *node)
92{
93 return node->hit + node->children_hit;
94}
95
96int callchain_register_param(struct callchain_param *param);
97int callchain_append(struct callchain_root *root,
98 struct callchain_cursor *cursor,
99 u64 period);
100
101int callchain_merge(struct callchain_cursor *cursor,
102 struct callchain_root *dst, struct callchain_root *src);
103
104struct ip_callchain;
105union perf_event;
106
107bool ip_callchain__valid(struct ip_callchain *chain,
108 const union perf_event *event);
109/*
110 * Initialize a cursor before adding entries inside, but keep
111 * the previously allocated entries as a cache.
112 */
113static inline void callchain_cursor_reset(struct callchain_cursor *cursor)
114{
115 cursor->nr = 0;
116 cursor->last = &cursor->first;
117}
118
119int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
120 struct map *map, struct symbol *sym);
121
122/* Close a cursor writing session. Initialize for the reader */
123static inline void callchain_cursor_commit(struct callchain_cursor *cursor)
124{
125 cursor->curr = cursor->first;
126 cursor->pos = 0;
127}
128
129/* Cursor reading iteration helpers */
130static inline struct callchain_cursor_node *
131callchain_cursor_current(struct callchain_cursor *cursor)
132{
133 if (cursor->pos == cursor->nr)
134 return NULL;
135
136 return cursor->curr;
137}
138
139static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
140{
141 cursor->curr = cursor->curr->next;
142 cursor->pos++;
143}
144#endif /* __PERF_CALLCHAIN_H */