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 * Special (free-form) trace entry:
31 struct special_entry
{
38 * The trace entry - the most basic unit of tracing. This is what
39 * is printed in the end as a single line in the trace output, such as:
41 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
51 struct ftrace_entry fn
;
52 struct ctx_switch_entry ctx
;
53 struct special_entry special
;
57 #define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
60 * The CPU trace array - it consists of thousands of trace entries
61 * plus some other descriptor data: (for example which task started
64 struct trace_array_cpu
{
65 struct list_head trace_pages
;
68 struct lock_class_key lock_key
;
70 /* these fields get copied into max-trace: */
71 unsigned trace_head_idx
;
72 unsigned trace_tail_idx
;
73 void *trace_head
; /* producer */
74 void *trace_tail
; /* consumer */
75 unsigned long trace_idx
;
76 unsigned long saved_latency
;
77 unsigned long critical_start
;
78 unsigned long critical_end
;
79 unsigned long critical_sequence
;
82 unsigned long rt_priority
;
83 cycle_t preempt_timestamp
;
86 char comm
[TASK_COMM_LEN
];
89 struct trace_iterator
;
92 * The trace array - an array of per-CPU trace arrays. This is the
93 * highest level data structure that individual tracers deal with.
94 * They have on/off state as well:
97 unsigned long entries
;
101 struct task_struct
*waiter
;
102 struct trace_array_cpu
*data
[NR_CPUS
];
106 * A specific tracer, represented by methods that operate on a trace array:
110 void (*init
)(struct trace_array
*tr
);
111 void (*reset
)(struct trace_array
*tr
);
112 void (*open
)(struct trace_iterator
*iter
);
113 void (*close
)(struct trace_iterator
*iter
);
114 void (*start
)(struct trace_iterator
*iter
);
115 void (*stop
)(struct trace_iterator
*iter
);
116 void (*ctrl_update
)(struct trace_array
*tr
);
117 #ifdef CONFIG_FTRACE_STARTUP_TEST
118 int (*selftest
)(struct tracer
*trace
,
119 struct trace_array
*tr
);
126 unsigned char buffer
[PAGE_SIZE
];
131 * Trace iterator - used by printout routines who present trace
132 * results to users and which routines might sleep, etc:
134 struct trace_iterator
{
135 struct trace_seq seq
;
136 struct trace_array
*tr
;
137 struct tracer
*trace
;
139 struct trace_entry
*ent
;
142 struct trace_entry
*prev_ent
;
145 unsigned long iter_flags
;
147 unsigned long next_idx
[NR_CPUS
];
148 struct list_head
*next_page
[NR_CPUS
];
149 unsigned next_page_idx
[NR_CPUS
];
153 void tracing_reset(struct trace_array_cpu
*data
);
154 int tracing_open_generic(struct inode
*inode
, struct file
*filp
);
155 struct dentry
*tracing_init_dentry(void);
156 void ftrace(struct trace_array
*tr
,
157 struct trace_array_cpu
*data
,
159 unsigned long parent_ip
,
160 unsigned long flags
);
161 void tracing_sched_switch_trace(struct trace_array
*tr
,
162 struct trace_array_cpu
*data
,
163 struct task_struct
*prev
,
164 struct task_struct
*next
,
165 unsigned long flags
);
166 void tracing_record_cmdline(struct task_struct
*tsk
);
167 void trace_special(struct trace_array
*tr
,
168 struct trace_array_cpu
*data
,
172 void trace_function(struct trace_array
*tr
,
173 struct trace_array_cpu
*data
,
175 unsigned long parent_ip
,
176 unsigned long flags
);
178 void tracing_start_function_trace(void);
179 void tracing_stop_function_trace(void);
180 int register_tracer(struct tracer
*type
);
181 void unregister_tracer(struct tracer
*type
);
183 extern unsigned long nsecs_to_usecs(unsigned long nsecs
);
185 extern unsigned long tracing_max_latency
;
186 extern unsigned long tracing_thresh
;
188 void update_max_tr(struct trace_array
*tr
, struct task_struct
*tsk
, int cpu
);
189 void update_max_tr_single(struct trace_array
*tr
,
190 struct task_struct
*tsk
, int cpu
);
192 extern cycle_t
ftrace_now(int cpu
);
194 #ifdef CONFIG_SCHED_TRACER
196 wakeup_sched_switch(struct task_struct
*prev
, struct task_struct
*next
);
199 wakeup_sched_switch(struct task_struct
*prev
, struct task_struct
*next
)
204 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
206 (*tracer_switch_func_t
)(void *private,
207 struct task_struct
*prev
,
208 struct task_struct
*next
);
210 struct tracer_switch_ops
{
211 tracer_switch_func_t func
;
213 struct tracer_switch_ops
*next
;
216 extern int register_tracer_switch(struct tracer_switch_ops
*ops
);
217 extern int unregister_tracer_switch(struct tracer_switch_ops
*ops
);
219 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
221 #ifdef CONFIG_DYNAMIC_FTRACE
222 extern unsigned long ftrace_update_tot_cnt
;
225 #ifdef CONFIG_FTRACE_STARTUP_TEST
227 extern int trace_selftest_startup_function(struct tracer
*trace
,
228 struct trace_array
*tr
);
230 #ifdef CONFIG_IRQSOFF_TRACER
231 extern int trace_selftest_startup_irqsoff(struct tracer
*trace
,
232 struct trace_array
*tr
);
234 #ifdef CONFIG_PREEMPT_TRACER
235 extern int trace_selftest_startup_preemptoff(struct tracer
*trace
,
236 struct trace_array
*tr
);
238 #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
239 extern int trace_selftest_startup_preemptirqsoff(struct tracer
*trace
,
240 struct trace_array
*tr
);
242 #ifdef CONFIG_SCHED_TRACER
243 extern int trace_selftest_startup_wakeup(struct tracer
*trace
,
244 struct trace_array
*tr
);
246 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
247 extern int trace_selftest_startup_sched_switch(struct tracer
*trace
,
248 struct trace_array
*tr
);
250 #endif /* CONFIG_FTRACE_STARTUP_TEST */
252 extern void *head_page(struct trace_array_cpu
*data
);
254 #endif /* _LINUX_KERNEL_TRACE_H */