include/linux/profile.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_PROFILE_H
   3 #define _LINUX_PROFILE_H
   4
   5 #include <linux/kernel.h>
   6 #include <linux/init.h>
   7 #include <linux/cpumask.h>
   8 #include <linux/cache.h>
   9
  10 #include <asm/errno.h>
  11
  12 #define CPU_PROFILING   1
  13 #define SCHED_PROFILING 2
  14 #define SLEEP_PROFILING 3
  15 #define KVM_PROFILING   4
  16
  17 struct proc_dir_entry;
  18 struct pt_regs;
  19 struct notifier_block;
  20
  21 #if defined(CONFIG_PROFILING) && defined(CONFIG_PROC_FS)
  22 void create_prof_cpu_mask(void);
  23 int create_proc_profile(void);
  24 #else
  25 static inline void create_prof_cpu_mask(void)
  26 {
  27 }
  28
  29 static inline int create_proc_profile(void)
  30 {
  31         return 0;
  32 }
  33 #endif
  34
  35 enum profile_type {
  36         PROFILE_TASK_EXIT,
  37         PROFILE_MUNMAP
  38 };
  39
  40 #ifdef CONFIG_PROFILING
  41
  42 extern int prof_on __read_mostly;
  43
  44 /* init basic kernel profiler */
  45 int profile_init(void);
  46 int profile_setup(char *str);
  47 void profile_tick(int type);
  48 int setup_profiling_timer(unsigned int multiplier);
  49
  50 /*
  51  * Add multiple profiler hits to a given address:
  52  */
  53 void profile_hits(int type, void *ip, unsigned int nr_hits);
  54
  55 /*
  56  * Single profiler hit:
  57  */
  58 static inline void profile_hit(int type, void *ip)
  59 {
  60         /*
  61          * Speedup for the common (no profiling enabled) case:
  62          */
  63         if (unlikely(prof_on == type))
  64                 profile_hits(type, ip, 1);
  65 }
  66
  67 struct task_struct;
  68 struct mm_struct;
  69
  70 /* task is in do_exit() */
  71 void profile_task_exit(struct task_struct * task);
  72
  73 /* task is dead, free task struct ? Returns 1 if
  74  * the task was taken, 0 if the task should be freed.
  75  */
  76 int profile_handoff_task(struct task_struct * task);
  77
  78 /* sys_munmap */
  79 void profile_munmap(unsigned long addr);
  80
  81 int task_handoff_register(struct notifier_block * n);
  82 int task_handoff_unregister(struct notifier_block * n);
  83
  84 int profile_event_register(enum profile_type, struct notifier_block * n);
  85 int profile_event_unregister(enum profile_type, struct notifier_block * n);
  86
  87 struct pt_regs;
  88
  89 #else
  90
  91 #define prof_on 0
  92
  93 static inline int profile_init(void)
  94 {
  95         return 0;
  96 }
  97
  98 static inline void profile_tick(int type)
  99 {
 100         return;
 101 }
 102
 103 static inline void profile_hits(int type, void *ip, unsigned int nr_hits)
 104 {
 105         return;
 106 }
 107
 108 static inline void profile_hit(int type, void *ip)
 109 {
 110         return;
 111 }
 112
 113 static inline int task_handoff_register(struct notifier_block * n)
 114 {
 115         return -ENOSYS;
 116 }
 117
 118 static inline int task_handoff_unregister(struct notifier_block * n)
 119 {
 120         return -ENOSYS;
 121 }
 122
 123 static inline int profile_event_register(enum profile_type t, struct notifier_block * n)
 124 {
 125         return -ENOSYS;
 126 }
 127
 128 static inline int profile_event_unregister(enum profile_type t, struct notifier_block * n)
 129 {
 130         return -ENOSYS;
 131 }
 132
 133 #define profile_task_exit(a) do { } while (0)
 134 #define profile_handoff_task(a) (0)
 135 #define profile_munmap(a) do { } while (0)
 136
 137 #endif /* CONFIG_PROFILING */
 138
 139 #endif /* _LINUX_PROFILE_H */