tools/perf/util/callchain.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PERF_CALLCHAIN_H
   3 #define __PERF_CALLCHAIN_H
   4
   5 #include "../perf.h"
   6 #include <linux/list.h>
   7 #include <linux/rbtree.h>
   8 #include "event.h"
   9 #include "map.h"
  10 #include "symbol.h"
  11 #include "branch.h"
  12
  13 #define HELP_PAD "\t\t\t\t"
  14
  15 #define CALLCHAIN_HELP "setup and enables call-graph (stack chain/backtrace):\n\n"
  16
  17 # define RECORD_MODE_HELP  HELP_PAD "record_mode:\tcall graph recording mode (fp|dwarf|lbr)\n"
  18
  19 #define RECORD_SIZE_HELP                                                \
  20         HELP_PAD "record_size:\tif record_mode is 'dwarf', max size of stack recording (<bytes>)\n" \
  21         HELP_PAD "\t\tdefault: 8192 (bytes)\n"
  22
  23 #define CALLCHAIN_RECORD_HELP  CALLCHAIN_HELP RECORD_MODE_HELP RECORD_SIZE_HELP
  24
  25 #define CALLCHAIN_REPORT_HELP                                           \
  26         HELP_PAD "print_type:\tcall graph printing style (graph|flat|fractal|folded|none)\n" \
  27         HELP_PAD "threshold:\tminimum call graph inclusion threshold (<percent>)\n" \
  28         HELP_PAD "print_limit:\tmaximum number of call graph entry (<number>)\n" \
  29         HELP_PAD "order:\t\tcall graph order (caller|callee)\n" \
  30         HELP_PAD "sort_key:\tcall graph sort key (function|address)\n"  \
  31         HELP_PAD "branch:\t\tinclude last branch info to call graph (branch)\n" \
  32         HELP_PAD "value:\t\tcall graph value (percent|period|count)\n"
  33
  34 enum perf_call_graph_mode {
  35         CALLCHAIN_NONE,
  36         CALLCHAIN_FP,
  37         CALLCHAIN_DWARF,
  38         CALLCHAIN_LBR,
  39         CALLCHAIN_MAX
  40 };
  41
  42 enum chain_mode {
  43         CHAIN_NONE,
  44         CHAIN_FLAT,
  45         CHAIN_GRAPH_ABS,
  46         CHAIN_GRAPH_REL,
  47         CHAIN_FOLDED,
  48 };
  49
  50 enum chain_order {
  51         ORDER_CALLER,
  52         ORDER_CALLEE
  53 };
  54
  55 struct callchain_node {
  56         struct callchain_node   *parent;
  57         struct list_head        val;
  58         struct list_head        parent_val;
  59         struct rb_node          rb_node_in; /* to insert nodes in an rbtree */
  60         struct rb_node          rb_node;    /* to sort nodes in an output tree */
  61         struct rb_root          rb_root_in; /* input tree of children */
  62         struct rb_root          rb_root;    /* sorted output tree of children */
  63         unsigned int            val_nr;
  64         unsigned int            count;
  65         unsigned int            children_count;
  66         u64                     hit;
  67         u64                     children_hit;
  68 };
  69
  70 struct callchain_root {
  71         u64                     max_depth;
  72         struct callchain_node   node;
  73 };
  74
  75 struct callchain_param;
  76
  77 typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_root *,
  78                                  u64, struct callchain_param *);
  79
  80 enum chain_key {
  81         CCKEY_FUNCTION,
  82         CCKEY_ADDRESS,
  83         CCKEY_SRCLINE
  84 };
  85
  86 enum chain_value {
  87         CCVAL_PERCENT,
  88         CCVAL_PERIOD,
  89         CCVAL_COUNT,
  90 };
  91
  92 extern bool dwarf_callchain_users;
  93
  94 struct callchain_param {
  95         bool                    enabled;
  96         enum perf_call_graph_mode record_mode;
  97         u32                     dump_size;
  98         enum chain_mode         mode;
  99         u16                     max_stack;
 100         u32                     print_limit;
 101         double                  min_percent;
 102         sort_chain_func_t       sort;
 103         enum chain_order        order;
 104         bool                    order_set;
 105         enum chain_key          key;
 106         bool                    branch_callstack;
 107         enum chain_value        value;
 108 };
 109
 110 extern struct callchain_param callchain_param;
 111 extern struct callchain_param callchain_param_default;
 112
 113 struct callchain_list {
 114         u64                     ip;
 115         struct map_symbol       ms;
 116         struct /* for TUI */ {
 117                 bool            unfolded;
 118                 bool            has_children;
 119         };
 120         u64                     branch_count;
 121         u64                     from_count;
 122         u64                     predicted_count;
 123         u64                     abort_count;
 124         u64                     cycles_count;
 125         u64                     iter_count;
 126         u64                     iter_cycles;
 127         struct branch_type_stat brtype_stat;
 128         const char              *srcline;
 129         struct list_head        list;
 130 };
 131
 132 /*
 133  * A callchain cursor is a single linked list that
 134  * let one feed a callchain progressively.
 135  * It keeps persistent allocated entries to minimize
 136  * allocations.
 137  */
 138 struct callchain_cursor_node {
 139         u64                             ip;
 140         struct map                      *map;
 141         struct symbol                   *sym;
 142         const char                      *srcline;
 143         bool                            branch;
 144         struct branch_flags             branch_flags;
 145         u64                             branch_from;
 146         int                             nr_loop_iter;
 147         u64                             iter_cycles;
 148         struct callchain_cursor_node    *next;
 149 };
 150
 151 struct callchain_cursor {
 152         u64                             nr;
 153         struct callchain_cursor_node    *first;
 154         struct callchain_cursor_node    **last;
 155         u64                             pos;
 156         struct callchain_cursor_node    *curr;
 157 };
 158
 159 extern __thread struct callchain_cursor callchain_cursor;
 160
 161 static inline void callchain_init(struct callchain_root *root)
 162 {
 163         INIT_LIST_HEAD(&root->node.val);
 164         INIT_LIST_HEAD(&root->node.parent_val);
 165
 166         root->node.parent = NULL;
 167         root->node.hit = 0;
 168         root->node.children_hit = 0;
 169         root->node.rb_root_in = RB_ROOT;
 170         root->max_depth = 0;
 171 }
 172
 173 static inline u64 callchain_cumul_hits(struct callchain_node *node)
 174 {
 175         return node->hit + node->children_hit;
 176 }
 177
 178 static inline unsigned callchain_cumul_counts(struct callchain_node *node)
 179 {
 180         return node->count + node->children_count;
 181 }
 182
 183 int callchain_register_param(struct callchain_param *param);
 184 int callchain_append(struct callchain_root *root,
 185                      struct callchain_cursor *cursor,
 186                      u64 period);
 187
 188 int callchain_merge(struct callchain_cursor *cursor,
 189                     struct callchain_root *dst, struct callchain_root *src);
 190
 191 /*
 192  * Initialize a cursor before adding entries inside, but keep
 193  * the previously allocated entries as a cache.
 194  */
 195 static inline void callchain_cursor_reset(struct callchain_cursor *cursor)
 196 {
 197         struct callchain_cursor_node *node;
 198
 199         cursor->nr = 0;
 200         cursor->last = &cursor->first;
 201
 202         for (node = cursor->first; node != NULL; node = node->next)
 203                 map__zput(node->map);
 204 }
 205
 206 int callchain_cursor_append(struct callchain_cursor *cursor, u64 ip,
 207                             struct map *map, struct symbol *sym,
 208                             bool branch, struct branch_flags *flags,
 209                             int nr_loop_iter, u64 iter_cycles, u64 branch_from,
 210                             const char *srcline);
 211
 212 /* Close a cursor writing session. Initialize for the reader */
 213 static inline void callchain_cursor_commit(struct callchain_cursor *cursor)
 214 {
 215         cursor->curr = cursor->first;
 216         cursor->pos = 0;
 217 }
 218
 219 /* Cursor reading iteration helpers */
 220 static inline struct callchain_cursor_node *
 221 callchain_cursor_current(struct callchain_cursor *cursor)
 222 {
 223         if (cursor->pos == cursor->nr)
 224                 return NULL;
 225
 226         return cursor->curr;
 227 }
 228
 229 static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
 230 {
 231         cursor->curr = cursor->curr->next;
 232         cursor->pos++;
 233 }
 234
 235 int callchain_cursor__copy(struct callchain_cursor *dst,
 236                            struct callchain_cursor *src);
 237
 238 struct option;
 239 struct hist_entry;
 240
 241 int record_parse_callchain_opt(const struct option *opt, const char *arg, int unset);
 242 int record_callchain_opt(const struct option *opt, const char *arg, int unset);
 243
 244 struct record_opts;
 245
 246 int record_opts__parse_callchain(struct record_opts *record,
 247                                  struct callchain_param *callchain,
 248                                  const char *arg, bool unset);
 249
 250 int sample__resolve_callchain(struct perf_sample *sample,
 251                               struct callchain_cursor *cursor, struct symbol **parent,
 252                               struct perf_evsel *evsel, struct addr_location *al,
 253                               int max_stack);
 254 int hist_entry__append_callchain(struct hist_entry *he, struct perf_sample *sample);
 255 int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *node,
 256                         bool hide_unresolved);
 257
 258 extern const char record_callchain_help[];
 259 int parse_callchain_record(const char *arg, struct callchain_param *param);
 260 int parse_callchain_record_opt(const char *arg, struct callchain_param *param);
 261 int parse_callchain_report_opt(const char *arg);
 262 int parse_callchain_top_opt(const char *arg);
 263 int perf_callchain_config(const char *var, const char *value);
 264
 265 static inline void callchain_cursor_snapshot(struct callchain_cursor *dest,
 266                                              struct callchain_cursor *src)
 267 {
 268         *dest = *src;
 269
 270         dest->first = src->curr;
 271         dest->nr -= src->pos;
 272 }
 273
 274 #ifdef HAVE_SKIP_CALLCHAIN_IDX
 275 int arch_skip_callchain_idx(struct thread *thread, struct ip_callchain *chain);
 276 #else
 277 static inline int arch_skip_callchain_idx(struct thread *thread __maybe_unused,
 278                         struct ip_callchain *chain __maybe_unused)
 279 {
 280         return -1;
 281 }
 282 #endif
 283
 284 char *callchain_list__sym_name(struct callchain_list *cl,
 285                                char *bf, size_t bfsize, bool show_dso);
 286 char *callchain_node__scnprintf_value(struct callchain_node *node,
 287                                       char *bf, size_t bfsize, u64 total);
 288 int callchain_node__fprintf_value(struct callchain_node *node,
 289                                   FILE *fp, u64 total);
 290
 291 int callchain_list_counts__printf_value(struct callchain_list *clist,
 292                                         FILE *fp, char *bf, int bfsize);
 293
 294 void free_callchain(struct callchain_root *root);
 295 void decay_callchain(struct callchain_root *root);
 296 int callchain_node__make_parent_list(struct callchain_node *node);
 297
 298 int callchain_branch_counts(struct callchain_root *root,
 299                             u64 *branch_count, u64 *predicted_count,
 300                             u64 *abort_count, u64 *cycles_count);
 301
 302 #endif  /* __PERF_CALLCHAIN_H */