projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 451db126 CP |
1 | /* |
| 2 | * call-path.h: Manipulate a tree data structure containing function call paths | |
| 3 | * Copyright (c) 2014, Intel Corporation. | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify it | |
| 6 | * under the terms and conditions of the GNU General Public License, | |
| 7 | * version 2, as published by the Free Software Foundation. | |
| 8 | * | |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 12 | * more details. | |
| 13 | * | |
| 14 | */ | |
| 15 | ||
| 16 | #ifndef __PERF_CALL_PATH_H | |
| 17 | #define __PERF_CALL_PATH_H | |
| 18 | ||
| 19 | #include <sys/types.h> | |
| 20 | ||
| 21 | #include <linux/types.h> | |
| 22 | #include <linux/rbtree.h> | |
| 23 | ||
| 24 | /** | |
| 25 | * struct call_path - node in list of calls leading to a function call. | |
| 26 | * @parent: call path to the parent function call | |
| 27 | * @sym: symbol of function called | |
| 28 | * @ip: only if sym is null, the ip of the function | |
| 29 | * @db_id: id used for db-export | |
| 30 | * @in_kernel: whether function is a in the kernel | |
| 31 | * @rb_node: node in parent's tree of called functions | |
| 32 | * @children: tree of call paths of functions called | |
| 33 | * | |
| 34 | * In combination with the call_return structure, the call_path structure | |
| 35 | * defines a context-sensitve call-graph. | |
| 36 | */ | |
| 37 | struct call_path { | |
| 38 | struct call_path *parent; | |
| 39 | struct symbol *sym; | |
| 40 | u64 ip; | |
| 41 | u64 db_id; | |
| 42 | bool in_kernel; | |
| 43 | struct rb_node rb_node; | |
| 44 | struct rb_root children; | |
| 45 | }; | |
| 46 | ||
| 47 | #define CALL_PATH_BLOCK_SHIFT 8 | |
| 48 | #define CALL_PATH_BLOCK_SIZE (1 << CALL_PATH_BLOCK_SHIFT) | |
| 49 | #define CALL_PATH_BLOCK_MASK (CALL_PATH_BLOCK_SIZE - 1) | |
| 50 | ||
| 51 | struct call_path_block { | |
| 52 | struct call_path cp[CALL_PATH_BLOCK_SIZE]; | |
| 53 | struct list_head node; | |
| 54 | }; | |
| 55 | ||
| 56 | /** | |
| 57 | * struct call_path_root - root of all call paths. | |
| 58 | * @call_path: root call path | |
| 59 | * @blocks: list of blocks to store call paths | |
| 60 | * @next: next free space | |
| 61 | * @sz: number of spaces | |
| 62 | */ | |
| 63 | struct call_path_root { | |
| 64 | struct call_path call_path; | |
| 65 | struct list_head blocks; | |
| 66 | size_t next; | |
| 67 | size_t sz; | |
| 68 | }; | |
| 69 | ||
| 70 | struct call_path_root *call_path_root__new(void); | |
| 71 | void call_path_root__free(struct call_path_root *cpr); | |
| 72 | ||
| 73 | struct call_path *call_path__findnew(struct call_path_root *cpr, | |
| 74 | struct call_path *parent, | |
| 75 | struct symbol *sym, u64 ip, u64 ks); | |
| 76 | ||
| 77 | #endif |