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 {
58 unsigned trace_current_idx;
59 struct list_head trace_pages;
60 unsigned long trace_idx;
62 unsigned long saved_latency;
63 unsigned long critical_start;
64 unsigned long critical_end;
65 unsigned long critical_sequence;
68 unsigned long rt_priority;
69 cycle_t preempt_timestamp;
72 char comm[TASK_COMM_LEN];
75 struct trace_iterator;
78 * The trace array - an array of per-CPU trace arrays. This is the
79 * highest level data structure that individual tracers deal with.
80 * They have on/off state as well:
83 unsigned long entries;
87 struct trace_array_cpu *data[NR_CPUS];
91 * A specific tracer, represented by methods that operate on a trace array:
95 void (*init)(struct trace_array *tr);
96 void (*reset)(struct trace_array *tr);
97 void (*open)(struct trace_iterator *iter);
98 void (*close)(struct trace_iterator *iter);
99 void (*start)(struct trace_iterator *iter);
100 void (*stop)(struct trace_iterator *iter);
101 void (*ctrl_update)(struct trace_array *tr);
107 * Trace iterator - used by printout routines who present trace
108 * results to users and which routines might sleep, etc:
110 struct trace_iterator {
111 struct trace_array *tr;
112 struct tracer *trace;
113 struct trace_entry *ent;
114 unsigned long iter_flags;
116 unsigned long next_idx[NR_CPUS];
117 struct list_head *next_page[NR_CPUS];
118 unsigned next_page_idx[NR_CPUS];
123 void notrace tracing_reset(struct trace_array_cpu *data);
124 int tracing_open_generic(struct inode *inode, struct file *filp);
125 struct dentry *tracing_init_dentry(void);
126 void ftrace(struct trace_array *tr,
127 struct trace_array_cpu *data,
129 unsigned long parent_ip,
130 unsigned long flags);
131 void tracing_sched_switch_trace(struct trace_array *tr,
132 struct trace_array_cpu *data,
133 struct task_struct *prev,
134 struct task_struct *next,
135 unsigned long flags);
136 void tracing_record_cmdline(struct task_struct *tsk);
138 void tracing_start_function_trace(void);
139 void tracing_stop_function_trace(void);
140 int register_tracer(struct tracer *type);
141 void unregister_tracer(struct tracer *type);
143 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
145 extern unsigned long tracing_max_latency;
146 extern unsigned long tracing_thresh;
148 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
149 void update_max_tr_single(struct trace_array *tr,
150 struct task_struct *tsk, int cpu);
152 static inline notrace cycle_t now(int cpu)
154 return cpu_clock(cpu);
157 #ifdef CONFIG_SCHED_TRACER
159 wakeup_sched_switch(struct task_struct *prev, struct task_struct *next);
162 wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
167 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
169 (*tracer_switch_func_t)(void *private,
170 struct task_struct *prev,
171 struct task_struct *next);
173 struct tracer_switch_ops {
174 tracer_switch_func_t func;
176 struct tracer_switch_ops *next;
179 extern int register_tracer_switch(struct tracer_switch_ops *ops);
180 extern int unregister_tracer_switch(struct tracer_switch_ops *ops);
182 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
184 #ifdef CONFIG_DYNAMIC_FTRACE
185 extern unsigned long ftrace_update_tot_cnt;
188 #endif /* _LINUX_KERNEL_TRACE_H */