tools/perf/util/callchain.h

   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
  10 enum chain_mode {
  11         CHAIN_NONE,
  12         CHAIN_FLAT,
  13         CHAIN_GRAPH_ABS,
  14         CHAIN_GRAPH_REL
  15 };
  16
  17 enum chain_order {
  18         ORDER_CALLER,
  19         ORDER_CALLEE
  20 };
  21
  22 struct 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
  34 struct callchain_root {
  35         u64                     max_depth;
  36         struct callchain_node   node;
  37 };
  38
  39 struct callchain_param;
  40
  41 typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_root *,
  42                                  u64, struct callchain_param *);
  43
  44 struct 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
  52 struct 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  */
  64 struct callchain_cursor_node {
  65         u64                             ip;
  66         struct map                      *map;
  67         struct symbol                   *sym;
  68         struct callchain_cursor_node    *next;
  69 };
  70
  71 struct 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
  79 extern __thread struct callchain_cursor callchain_cursor;
  80
  81 static inline void callchain_init(struct callchain_root *root)
  82 {
  83         INIT_LIST_HEAD(&root->node.siblings);
  84         INIT_LIST_HEAD(&root->node.children);
  85         INIT_LIST_HEAD(&root->node.val);
  86
  87         root->node.parent = NULL;
  88         root->node.hit = 0;
  89         root->node.children_hit = 0;
  90         root->max_depth = 0;
  91 }
  92
  93 static inline u64 callchain_cumul_hits(struct callchain_node *node)
  94 {
  95         return node->hit + node->children_hit;
  96 }
  97
  98 int callchain_register_param(struct callchain_param *param);
  99 int callchain_append(struct callchain_root *root,
 100                      struct callchain_cursor *cursor,
 101                      u64 period);
 102
 103 int callchain_merge(struct callchain_cursor *cursor,
 104                     struct callchain_root *dst, struct callchain_root *src);
 105
 106 struct ip_callchain;
 107 union perf_event;
 108
 109 bool ip_callchain__valid(struct ip_callchain *chain,
 110                          const union perf_event *event);
 111 /*
 112  * Initialize a cursor before adding entries inside, but keep
 113  * the previously allocated entries as a cache.
 114  */
 115 static inline void callchain_cursor_reset(struct callchain_cursor *cursor)
 116 {
 117         cursor->nr = 0;
 118         cursor->last = &cursor->first;
 119 }
 120
 121 int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
 122                             struct map *map, struct symbol *sym);
 123
 124 /* Close a cursor writing session. Initialize for the reader */
 125 static inline void callchain_cursor_commit(struct callchain_cursor *cursor)
 126 {
 127         cursor->curr = cursor->first;
 128         cursor->pos = 0;
 129 }
 130
 131 /* Cursor reading iteration helpers */
 132 static inline struct callchain_cursor_node *
 133 callchain_cursor_current(struct callchain_cursor *cursor)
 134 {
 135         if (cursor->pos == cursor->nr)
 136                 return NULL;
 137
 138         return cursor->curr;
 139 }
 140
 141 static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
 142 {
 143         cursor->curr = cursor->curr->next;
 144         cursor->pos++;
 145 }
 146 #endif  /* __PERF_CALLCHAIN_H */