![Steven Rostedt](/assets/img/avatar_default.png)
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
220 lines
5.7 KiB
C
220 lines
5.7 KiB
C
#ifndef _LINUX_KERNEL_TRACE_H
|
|
#define _LINUX_KERNEL_TRACE_H
|
|
|
|
#include <linux/fs.h>
|
|
#include <asm/atomic.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/clocksource.h>
|
|
|
|
/*
|
|
* Function trace entry - function address and parent function addres:
|
|
*/
|
|
struct ftrace_entry {
|
|
unsigned long ip;
|
|
unsigned long parent_ip;
|
|
};
|
|
|
|
/*
|
|
* Context switch trace entry - which task (and prio) we switched from/to:
|
|
*/
|
|
struct ctx_switch_entry {
|
|
unsigned int prev_pid;
|
|
unsigned char prev_prio;
|
|
unsigned char prev_state;
|
|
unsigned int next_pid;
|
|
unsigned char next_prio;
|
|
};
|
|
|
|
/*
|
|
* The trace entry - the most basic unit of tracing. This is what
|
|
* is printed in the end as a single line in the trace output, such as:
|
|
*
|
|
* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
|
|
*/
|
|
struct trace_entry {
|
|
char type;
|
|
char cpu;
|
|
char flags;
|
|
char preempt_count;
|
|
int pid;
|
|
cycle_t t;
|
|
unsigned long idx;
|
|
union {
|
|
struct ftrace_entry fn;
|
|
struct ctx_switch_entry ctx;
|
|
};
|
|
};
|
|
|
|
#define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
|
|
|
|
/*
|
|
* The CPU trace array - it consists of thousands of trace entries
|
|
* plus some other descriptor data: (for example which task started
|
|
* the trace, etc.)
|
|
*/
|
|
struct trace_array_cpu {
|
|
void *trace;
|
|
void *trace_current;
|
|
unsigned trace_current_idx;
|
|
struct list_head trace_pages;
|
|
unsigned long trace_idx;
|
|
atomic_t disabled;
|
|
unsigned long saved_latency;
|
|
unsigned long critical_start;
|
|
unsigned long critical_end;
|
|
unsigned long critical_sequence;
|
|
unsigned long nice;
|
|
unsigned long policy;
|
|
unsigned long rt_priority;
|
|
cycle_t preempt_timestamp;
|
|
pid_t pid;
|
|
uid_t uid;
|
|
char comm[TASK_COMM_LEN];
|
|
};
|
|
|
|
struct trace_iterator;
|
|
|
|
/*
|
|
* The trace array - an array of per-CPU trace arrays. This is the
|
|
* highest level data structure that individual tracers deal with.
|
|
* They have on/off state as well:
|
|
*/
|
|
struct trace_array {
|
|
unsigned long entries;
|
|
long ctrl;
|
|
int cpu;
|
|
cycle_t time_start;
|
|
struct trace_array_cpu *data[NR_CPUS];
|
|
};
|
|
|
|
/*
|
|
* A specific tracer, represented by methods that operate on a trace array:
|
|
*/
|
|
struct tracer {
|
|
const char *name;
|
|
void (*init)(struct trace_array *tr);
|
|
void (*reset)(struct trace_array *tr);
|
|
void (*open)(struct trace_iterator *iter);
|
|
void (*close)(struct trace_iterator *iter);
|
|
void (*start)(struct trace_iterator *iter);
|
|
void (*stop)(struct trace_iterator *iter);
|
|
void (*ctrl_update)(struct trace_array *tr);
|
|
#ifdef CONFIG_FTRACE_STARTUP_TEST
|
|
int (*selftest)(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
struct tracer *next;
|
|
int print_max;
|
|
};
|
|
|
|
/*
|
|
* Trace iterator - used by printout routines who present trace
|
|
* results to users and which routines might sleep, etc:
|
|
*/
|
|
struct trace_iterator {
|
|
struct trace_array *tr;
|
|
struct tracer *trace;
|
|
struct trace_entry *ent;
|
|
unsigned long iter_flags;
|
|
loff_t pos;
|
|
unsigned long next_idx[NR_CPUS];
|
|
struct list_head *next_page[NR_CPUS];
|
|
unsigned next_page_idx[NR_CPUS];
|
|
long idx;
|
|
int cpu;
|
|
};
|
|
|
|
void notrace tracing_reset(struct trace_array_cpu *data);
|
|
int tracing_open_generic(struct inode *inode, struct file *filp);
|
|
struct dentry *tracing_init_dentry(void);
|
|
void ftrace(struct trace_array *tr,
|
|
struct trace_array_cpu *data,
|
|
unsigned long ip,
|
|
unsigned long parent_ip,
|
|
unsigned long flags);
|
|
void tracing_sched_switch_trace(struct trace_array *tr,
|
|
struct trace_array_cpu *data,
|
|
struct task_struct *prev,
|
|
struct task_struct *next,
|
|
unsigned long flags);
|
|
void tracing_record_cmdline(struct task_struct *tsk);
|
|
|
|
void tracing_start_function_trace(void);
|
|
void tracing_stop_function_trace(void);
|
|
int register_tracer(struct tracer *type);
|
|
void unregister_tracer(struct tracer *type);
|
|
|
|
extern unsigned long nsecs_to_usecs(unsigned long nsecs);
|
|
|
|
extern unsigned long tracing_max_latency;
|
|
extern unsigned long tracing_thresh;
|
|
|
|
void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
|
|
void update_max_tr_single(struct trace_array *tr,
|
|
struct task_struct *tsk, int cpu);
|
|
|
|
static inline notrace cycle_t now(int cpu)
|
|
{
|
|
return cpu_clock(cpu);
|
|
}
|
|
|
|
#ifdef CONFIG_SCHED_TRACER
|
|
extern void notrace
|
|
wakeup_sched_switch(struct task_struct *prev, struct task_struct *next);
|
|
#else
|
|
static inline void
|
|
wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
|
|
typedef void
|
|
(*tracer_switch_func_t)(void *private,
|
|
struct task_struct *prev,
|
|
struct task_struct *next);
|
|
|
|
struct tracer_switch_ops {
|
|
tracer_switch_func_t func;
|
|
void *private;
|
|
struct tracer_switch_ops *next;
|
|
};
|
|
|
|
extern int register_tracer_switch(struct tracer_switch_ops *ops);
|
|
extern int unregister_tracer_switch(struct tracer_switch_ops *ops);
|
|
|
|
#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
extern unsigned long ftrace_update_tot_cnt;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FTRACE_STARTUP_TEST
|
|
#ifdef CONFIG_FTRACE
|
|
extern int trace_selftest_startup_function(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
#ifdef CONFIG_IRQSOFF_TRACER
|
|
extern int trace_selftest_startup_irqsoff(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
#ifdef CONFIG_PREEMPT_TRACER
|
|
extern int trace_selftest_startup_preemptoff(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
|
|
extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
#ifdef CONFIG_SCHED_TRACER
|
|
extern int trace_selftest_startup_wakeup(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
|
|
extern int trace_selftest_startup_sched_switch(struct tracer *trace,
|
|
struct trace_array *tr);
|
|
#endif
|
|
#endif /* CONFIG_FTRACE_STARTUP_TEST */
|
|
|
|
#endif /* _LINUX_KERNEL_TRACE_H */
|