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 perf_call_graph_mode {
  11         CALLCHAIN_NONE,
  12         CALLCHAIN_FP,
  13         CALLCHAIN_DWARF,
  14         CALLCHAIN_LBR,
  15         CALLCHAIN_MAX
  16 };
  17
  18 enum chain_mode {
  19         CHAIN_NONE,
  20         CHAIN_FLAT,
  21         CHAIN_GRAPH_ABS,
  22         CHAIN_GRAPH_REL
  23 };
  24
  25 enum chain_order {
  26         ORDER_CALLER,
  27         ORDER_CALLEE
  28 };
  29
  30 struct callchain_node {
  31         struct callchain_node   *parent;
  32         struct list_head        val;
  33         struct rb_node          rb_node_in; /* to insert nodes in an rbtree */
  34         struct rb_node          rb_node;    /* to sort nodes in an output tree */
  35         struct rb_root          rb_root_in; /* input tree of children */
  36         struct rb_root          rb_root;    /* sorted output tree of children */
  37         unsigned int            val_nr;
  38         u64                     hit;
  39         u64                     children_hit;
  40 };
  41
  42 struct callchain_root {
  43         u64                     max_depth;
  44         struct callchain_node   node;
  45 };
  46
  47 struct callchain_param;
  48
  49 typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_root *,
  50                                  u64, struct callchain_param *);
  51
  52 enum chain_key {
  53         CCKEY_FUNCTION,
  54         CCKEY_ADDRESS
  55 };
  56
  57 struct callchain_param {
  58         bool                    enabled;
  59         enum perf_call_graph_mode record_mode;
  60         u32                     dump_size;
  61         enum chain_mode         mode;
  62         u32                     print_limit;
  63         double                  min_percent;
  64         sort_chain_func_t       sort;
  65         enum chain_order        order;
  66         enum chain_key          key;
  67         bool                    branch_callstack;
  68 };
  69
  70 extern struct callchain_param callchain_param;
  71
  72 struct callchain_list {
  73         u64                     ip;
  74         struct map_symbol       ms;
  75         char                   *srcline;
  76         struct list_head        list;
  77 };
  78
  79 /*
  80  * A callchain cursor is a single linked list that
  81  * let one feed a callchain progressively.
  82  * It keeps persistent allocated entries to minimize
  83  * allocations.
  84  */
  85 struct callchain_cursor_node {
  86         u64                             ip;
  87         struct map                      *map;
  88         struct symbol                   *sym;
  89         struct callchain_cursor_node    *next;
  90 };
  91
  92 struct callchain_cursor {
  93         u64                             nr;
  94         struct callchain_cursor_node    *first;
  95         struct callchain_cursor_node    **last;
  96         u64                             pos;
  97         struct callchain_cursor_node    *curr;
  98 };
  99
 100 extern __thread struct callchain_cursor callchain_cursor;
 101
 102 static inline void callchain_init(struct callchain_root *root)
 103 {
 104         INIT_LIST_HEAD(&root->node.val);
 105
 106         root->node.parent = NULL;
 107         root->node.hit = 0;
 108         root->node.children_hit = 0;
 109         root->node.rb_root_in = RB_ROOT;
 110         root->max_depth = 0;
 111 }
 112
 113 static inline u64 callchain_cumul_hits(struct callchain_node *node)
 114 {
 115         return node->hit + node->children_hit;
 116 }
 117
 118 int callchain_register_param(struct callchain_param *param);
 119 int callchain_append(struct callchain_root *root,
 120                      struct callchain_cursor *cursor,
 121                      u64 period);
 122
 123 int callchain_merge(struct callchain_cursor *cursor,
 124                     struct callchain_root *dst, struct callchain_root *src);
 125
 126 /*
 127  * Initialize a cursor before adding entries inside, but keep
 128  * the previously allocated entries as a cache.
 129  */
 130 static inline void callchain_cursor_reset(struct callchain_cursor *cursor)
 131 {
 132         cursor->nr = 0;
 133         cursor->last = &cursor->first;
 134 }
 135
 136 int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
 137                             struct map *map, struct symbol *sym);
 138
 139 /* Close a cursor writing session. Initialize for the reader */
 140 static inline void callchain_cursor_commit(struct callchain_cursor *cursor)
 141 {
 142         cursor->curr = cursor->first;
 143         cursor->pos = 0;
 144 }
 145
 146 /* Cursor reading iteration helpers */
 147 static inline struct callchain_cursor_node *
 148 callchain_cursor_current(struct callchain_cursor *cursor)
 149 {
 150         if (cursor->pos == cursor->nr)
 151                 return NULL;
 152
 153         return cursor->curr;
 154 }
 155
 156 static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
 157 {
 158         cursor->curr = cursor->curr->next;
 159         cursor->pos++;
 160 }
 161
 162 struct option;
 163 struct hist_entry;
 164
 165 int record_parse_callchain_opt(const struct option *opt, const char *arg, int unset);
 166 int record_callchain_opt(const struct option *opt, const char *arg, int unset);
 167
 168 int sample__resolve_callchain(struct perf_sample *sample, struct symbol **parent,
 169                               struct perf_evsel *evsel, struct addr_location *al,
 170                               int max_stack);
 171 int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample);
 172 int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node,
 173                         bool hide_unresolved);
 174
 175 extern const char record_callchain_help[];
 176 int parse_callchain_record_opt(const char *arg);
 177 int parse_callchain_report_opt(const char *arg);
 178 int perf_callchain_config(const char *var, const char *value);
 179
 180 static inline void callchain_cursor_snapshot(struct callchain_cursor *dest,
 181                                              struct callchain_cursor *src)
 182 {
 183         *dest = *src;
 184
 185         dest->first = src->curr;
 186         dest->nr -= src->pos;
 187 }
 188
 189 #ifdef HAVE_SKIP_CALLCHAIN_IDX
 190 extern int arch_skip_callchain_idx(struct thread *thread, struct ip_callchain *chain);
 191 #else
 192 static inline int arch_skip_callchain_idx(struct thread *thread __maybe_unused,
 193                         struct ip_callchain *chain __maybe_unused)
 194 {
 195         return -1;
 196 }
 197 #endif
 198
 199 char *callchain_list__sym_name(struct callchain_list *cl,
 200                                char *bf, size_t bfsize, bool show_dso);
 201
 202 void free_callchain(struct callchain_root *root);
 203
 204 #endif  /* __PERF_CALLCHAIN_H */