1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
5 #include <asm/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
10 * Function trace entry - function address and parent function addres:
14 unsigned long parent_ip;
18 * Context switch trace entry - which task (and prio) we switched from/to:
20 struct ctx_switch_entry {
21 unsigned int prev_pid;
22 unsigned char prev_prio;
23 unsigned char prev_state;
24 unsigned int next_pid;
25 unsigned char next_prio;
29 * The trace entry - the most basic unit of tracing. This is what
30 * is printed in the end as a single line in the trace output, such as:
32 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
43 struct ftrace_entry fn;
44 struct ctx_switch_entry ctx;
48 #define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
51 * The CPU trace array - it consists of thousands of trace entries
52 * plus some other descriptor data: (for example which task started
55 struct trace_array_cpu {
57 unsigned long trace_idx;
60 unsigned long saved_latency;
61 unsigned long critical_start;
62 unsigned long critical_end;
63 unsigned long critical_sequence;
66 unsigned long rt_priority;
67 cycle_t preempt_timestamp;
70 char comm[TASK_COMM_LEN];
73 struct trace_iterator;
76 * The trace array - an array of per-CPU trace arrays. This is the
77 * highest level data structure that individual tracers deal with.
78 * They have on/off state as well:
81 unsigned long entries;
85 struct trace_array_cpu *data[NR_CPUS];
89 * A specific tracer, represented by methods that operate on a trace array:
93 void (*init)(struct trace_array *tr);
94 void (*reset)(struct trace_array *tr);
95 void (*open)(struct trace_iterator *iter);
96 void (*close)(struct trace_iterator *iter);
97 void (*start)(struct trace_iterator *iter);
98 void (*stop)(struct trace_iterator *iter);
99 void (*ctrl_update)(struct trace_array *tr);
105 * Trace iterator - used by printout routines who present trace
106 * results to users and which routines might sleep, etc:
108 struct trace_iterator {
109 struct trace_array *tr;
110 struct tracer *trace;
111 struct trace_entry *ent;
112 unsigned long iter_flags;
114 unsigned long next_idx[NR_CPUS];
119 void notrace tracing_reset(struct trace_array_cpu *data);
120 int tracing_open_generic(struct inode *inode, struct file *filp);
121 struct dentry *tracing_init_dentry(void);
122 void ftrace(struct trace_array *tr,
123 struct trace_array_cpu *data,
125 unsigned long parent_ip,
126 unsigned long flags);
127 void tracing_sched_switch_trace(struct trace_array *tr,
128 struct trace_array_cpu *data,
129 struct task_struct *prev,
130 struct task_struct *next,
131 unsigned long flags);
132 void tracing_record_cmdline(struct task_struct *tsk);
134 void tracing_start_function_trace(void);
135 void tracing_stop_function_trace(void);
136 int register_tracer(struct tracer *type);
137 void unregister_tracer(struct tracer *type);
139 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
141 extern unsigned long tracing_max_latency;
142 extern unsigned long tracing_thresh;
144 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
145 void update_max_tr_single(struct trace_array *tr,
146 struct task_struct *tsk, int cpu);
148 static inline notrace cycle_t now(int cpu)
150 return cpu_clock(cpu);
153 #ifdef CONFIG_SCHED_TRACER
155 wakeup_sched_switch(struct task_struct *prev, struct task_struct *next);
158 wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
163 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
165 (*tracer_switch_func_t)(void *private,
166 struct task_struct *prev,
167 struct task_struct *next);
169 struct tracer_switch_ops {
170 tracer_switch_func_t func;
172 struct tracer_switch_ops *next;
175 extern int register_tracer_switch(struct tracer_switch_ops *ops);
176 extern int unregister_tracer_switch(struct tracer_switch_ops *ops);
178 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
180 #ifdef CONFIG_DYNAMIC_FTRACE
181 extern unsigned long ftrace_update_tot_cnt;
184 #endif /* _LINUX_KERNEL_TRACE_H */