d05cdb25d8
With the adding of the configuration changes in the Makefile to prevent tracing of functions in the ftrace code, all tracing of all the ftrace code has been removed. Unfortunately, one of the selftests, relied on a function to be traced. With the new change, the function was no longer traced and the test failed. This patch separates out the test function into its own file so that we can add the "-pg" flag to the compilation of that function and the adding of the mcount call to that function. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
296 lines
7.5 KiB
C
296 lines
7.5 KiB
C
#ifndef _LINUX_KERNEL_TRACE_H
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#define _LINUX_KERNEL_TRACE_H
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#include <linux/fs.h>
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#include <asm/atomic.h>
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#include <linux/sched.h>
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#include <linux/clocksource.h>
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/*
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* Function trace entry - function address and parent function addres:
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*/
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struct ftrace_entry {
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unsigned long ip;
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unsigned long parent_ip;
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};
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/*
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* Context switch trace entry - which task (and prio) we switched from/to:
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*/
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struct ctx_switch_entry {
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unsigned int prev_pid;
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unsigned char prev_prio;
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unsigned char prev_state;
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unsigned int next_pid;
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unsigned char next_prio;
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unsigned char next_state;
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};
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/*
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* Special (free-form) trace entry:
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*/
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struct special_entry {
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unsigned long arg1;
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unsigned long arg2;
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unsigned long arg3;
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};
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/*
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* Stack-trace entry:
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*/
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#define FTRACE_STACK_ENTRIES 5
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struct stack_entry {
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unsigned long caller[FTRACE_STACK_ENTRIES];
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};
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/*
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* The trace entry - the most basic unit of tracing. This is what
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* is printed in the end as a single line in the trace output, such as:
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*
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* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
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*/
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struct trace_entry {
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char type;
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char cpu;
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char flags;
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char preempt_count;
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int pid;
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cycle_t t;
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union {
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struct ftrace_entry fn;
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struct ctx_switch_entry ctx;
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struct special_entry special;
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struct stack_entry stack;
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};
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};
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#define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
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/*
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* The CPU trace array - it consists of thousands of trace entries
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* plus some other descriptor data: (for example which task started
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* the trace, etc.)
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*/
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struct trace_array_cpu {
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struct list_head trace_pages;
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atomic_t disabled;
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spinlock_t lock;
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struct lock_class_key lock_key;
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/* these fields get copied into max-trace: */
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unsigned trace_head_idx;
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unsigned trace_tail_idx;
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void *trace_head; /* producer */
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void *trace_tail; /* consumer */
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unsigned long trace_idx;
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unsigned long saved_latency;
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unsigned long critical_start;
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unsigned long critical_end;
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unsigned long critical_sequence;
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unsigned long nice;
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unsigned long policy;
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unsigned long rt_priority;
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cycle_t preempt_timestamp;
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pid_t pid;
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uid_t uid;
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char comm[TASK_COMM_LEN];
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};
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struct trace_iterator;
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/*
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* The trace array - an array of per-CPU trace arrays. This is the
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* highest level data structure that individual tracers deal with.
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* They have on/off state as well:
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*/
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struct trace_array {
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unsigned long entries;
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long ctrl;
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int cpu;
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cycle_t time_start;
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struct task_struct *waiter;
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struct trace_array_cpu *data[NR_CPUS];
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};
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/*
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* A specific tracer, represented by methods that operate on a trace array:
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*/
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struct tracer {
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const char *name;
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void (*init)(struct trace_array *tr);
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void (*reset)(struct trace_array *tr);
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void (*open)(struct trace_iterator *iter);
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void (*close)(struct trace_iterator *iter);
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void (*start)(struct trace_iterator *iter);
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void (*stop)(struct trace_iterator *iter);
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void (*ctrl_update)(struct trace_array *tr);
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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int (*selftest)(struct tracer *trace,
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struct trace_array *tr);
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#endif
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struct tracer *next;
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int print_max;
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};
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struct trace_seq {
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unsigned char buffer[PAGE_SIZE];
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unsigned int len;
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};
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/*
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* Trace iterator - used by printout routines who present trace
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* results to users and which routines might sleep, etc:
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*/
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struct trace_iterator {
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struct trace_seq seq;
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struct trace_array *tr;
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struct tracer *trace;
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struct trace_entry *ent;
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int cpu;
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struct trace_entry *prev_ent;
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int prev_cpu;
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unsigned long iter_flags;
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loff_t pos;
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unsigned long next_idx[NR_CPUS];
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struct list_head *next_page[NR_CPUS];
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unsigned next_page_idx[NR_CPUS];
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long idx;
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};
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void tracing_reset(struct trace_array_cpu *data);
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int tracing_open_generic(struct inode *inode, struct file *filp);
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struct dentry *tracing_init_dentry(void);
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void ftrace(struct trace_array *tr,
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struct trace_array_cpu *data,
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unsigned long ip,
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unsigned long parent_ip,
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unsigned long flags);
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void tracing_sched_switch_trace(struct trace_array *tr,
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struct trace_array_cpu *data,
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struct task_struct *prev,
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struct task_struct *next,
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unsigned long flags);
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void tracing_record_cmdline(struct task_struct *tsk);
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void tracing_sched_wakeup_trace(struct trace_array *tr,
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struct trace_array_cpu *data,
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struct task_struct *wakee,
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struct task_struct *cur,
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unsigned long flags);
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void trace_special(struct trace_array *tr,
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struct trace_array_cpu *data,
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unsigned long arg1,
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unsigned long arg2,
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unsigned long arg3);
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void trace_function(struct trace_array *tr,
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struct trace_array_cpu *data,
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unsigned long ip,
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unsigned long parent_ip,
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unsigned long flags);
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void tracing_start_function_trace(void);
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void tracing_stop_function_trace(void);
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int register_tracer(struct tracer *type);
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void unregister_tracer(struct tracer *type);
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extern unsigned long nsecs_to_usecs(unsigned long nsecs);
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extern unsigned long tracing_max_latency;
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extern unsigned long tracing_thresh;
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void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
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void update_max_tr_single(struct trace_array *tr,
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struct task_struct *tsk, int cpu);
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extern cycle_t ftrace_now(int cpu);
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#ifdef CONFIG_SCHED_TRACER
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extern void
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wakeup_sched_switch(struct task_struct *prev, struct task_struct *next);
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extern void
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wakeup_sched_wakeup(struct task_struct *wakee, struct task_struct *curr);
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#else
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static inline void
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wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
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{
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}
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static inline void
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wakeup_sched_wakeup(struct task_struct *wakee, struct task_struct *curr)
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{
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}
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#endif
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#ifdef CONFIG_CONTEXT_SWITCH_TRACER
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typedef void
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(*tracer_switch_func_t)(void *private,
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struct task_struct *prev,
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struct task_struct *next);
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struct tracer_switch_ops {
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tracer_switch_func_t func;
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void *private;
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struct tracer_switch_ops *next;
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};
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extern int register_tracer_switch(struct tracer_switch_ops *ops);
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extern int unregister_tracer_switch(struct tracer_switch_ops *ops);
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#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
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#ifdef CONFIG_DYNAMIC_FTRACE
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extern unsigned long ftrace_update_tot_cnt;
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#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
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extern int DYN_FTRACE_TEST_NAME(void);
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#endif
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#ifdef CONFIG_FTRACE_STARTUP_TEST
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#ifdef CONFIG_FTRACE
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extern int trace_selftest_startup_function(struct tracer *trace,
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struct trace_array *tr);
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#endif
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#ifdef CONFIG_IRQSOFF_TRACER
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extern int trace_selftest_startup_irqsoff(struct tracer *trace,
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struct trace_array *tr);
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#endif
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#ifdef CONFIG_PREEMPT_TRACER
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extern int trace_selftest_startup_preemptoff(struct tracer *trace,
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struct trace_array *tr);
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#endif
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#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
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extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
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struct trace_array *tr);
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#endif
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#ifdef CONFIG_SCHED_TRACER
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extern int trace_selftest_startup_wakeup(struct tracer *trace,
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struct trace_array *tr);
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#endif
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#ifdef CONFIG_CONTEXT_SWITCH_TRACER
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extern int trace_selftest_startup_sched_switch(struct tracer *trace,
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struct trace_array *tr);
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#endif
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#endif /* CONFIG_FTRACE_STARTUP_TEST */
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extern void *head_page(struct trace_array_cpu *data);
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extern unsigned long trace_flags;
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enum trace_iterator_flags {
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TRACE_ITER_PRINT_PARENT = 0x01,
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TRACE_ITER_SYM_OFFSET = 0x02,
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TRACE_ITER_SYM_ADDR = 0x04,
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TRACE_ITER_VERBOSE = 0x08,
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TRACE_ITER_RAW = 0x10,
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TRACE_ITER_HEX = 0x20,
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TRACE_ITER_BIN = 0x40,
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TRACE_ITER_BLOCK = 0x80,
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TRACE_ITER_STACKTRACE = 0x100,
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TRACE_ITER_SCHED_TREE = 0x200,
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};
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#endif /* _LINUX_KERNEL_TRACE_H */
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