6cd8a4bb2f
Add preempt off timings. A lot of kernel core code is taken from the RT patch latency trace that was written by Ingo Molnar. This adds "preemptoff" and "preemptirqsoff" to /debugfs/tracing/available_tracers Now instead of just tracing irqs off, preemption off can be selected to be recorded. When this is selected, it shares the same files as irqs off timings. One can either trace preemption off, irqs off, or one or the other off. By echoing "preemptoff" into /debugfs/tracing/current_tracer, recording of preempt off only is performed. "irqsoff" will only record the time irqs are disabled, but "preemptirqsoff" will take the total time irqs or preemption are disabled. Runtime switching of these options is now supported by simpling echoing in the appropriate trace name into /debugfs/tracing/current_tracer. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
#ifndef _LINUX_FTRACE_H
|
|
#define _LINUX_FTRACE_H
|
|
|
|
#ifdef CONFIG_FTRACE
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
|
|
|
|
struct ftrace_ops {
|
|
ftrace_func_t func;
|
|
struct ftrace_ops *next;
|
|
};
|
|
|
|
/*
|
|
* The ftrace_ops must be a static and should also
|
|
* be read_mostly. These functions do modify read_mostly variables
|
|
* so use them sparely. Never free an ftrace_op or modify the
|
|
* next pointer after it has been registered. Even after unregistering
|
|
* it, the next pointer may still be used internally.
|
|
*/
|
|
int register_ftrace_function(struct ftrace_ops *ops);
|
|
int unregister_ftrace_function(struct ftrace_ops *ops);
|
|
void clear_ftrace_function(void);
|
|
|
|
extern void ftrace_stub(unsigned long a0, unsigned long a1);
|
|
extern void mcount(void);
|
|
|
|
#else /* !CONFIG_FTRACE */
|
|
# define register_ftrace_function(ops) do { } while (0)
|
|
# define unregister_ftrace_function(ops) do { } while (0)
|
|
# define clear_ftrace_function(ops) do { } while (0)
|
|
#endif /* CONFIG_FTRACE */
|
|
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
/* TODO: need to fix this for ARM */
|
|
# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
|
|
# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
|
|
# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
|
|
# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
|
|
# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
|
|
# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
|
|
#else
|
|
# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
|
|
# define CALLER_ADDR1 0UL
|
|
# define CALLER_ADDR2 0UL
|
|
# define CALLER_ADDR3 0UL
|
|
# define CALLER_ADDR4 0UL
|
|
# define CALLER_ADDR5 0UL
|
|
#endif
|
|
|
|
#ifdef CONFIG_IRQSOFF_TRACER
|
|
extern void notrace time_hardirqs_on(unsigned long a0, unsigned long a1);
|
|
extern void notrace time_hardirqs_off(unsigned long a0, unsigned long a1);
|
|
#else
|
|
# define time_hardirqs_on(a0, a1) do { } while (0)
|
|
# define time_hardirqs_off(a0, a1) do { } while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_PREEMPT_TRACER
|
|
extern void notrace trace_preempt_on(unsigned long a0, unsigned long a1);
|
|
extern void notrace trace_preempt_off(unsigned long a0, unsigned long a1);
|
|
#else
|
|
# define trace_preempt_on(a0, a1) do { } while (0)
|
|
# define trace_preempt_off(a0, a1) do { } while (0)
|
|
#endif
|
|
|
|
#endif /* _LINUX_FTRACE_H */
|