summaryrefslogblamecommitdiff
path: root/kernel/trace/trace_functions.c
blob: 69a0eb00a0a519b0b978b3cebab8adb2ade6c8be (plain) (tree) 
1b29b01887e6 ^











1b29b01887e6 ^



2e0f57618529 ^

1b29b01887e6 ^







750ed1a40783 ^

1b29b01887e6 ^










































60a11774b38f ^



1b29b01887e6 ^








1
2
3
4
5
6
7
8
9
10
11

12
13
14

15

16
17
18
19
20
21
22

23

24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65

66
67
68

69
70
71
72
73
74
75
76











                                                               


                          
                     






                                                          
                                             









































                                                                      


                                                       







                                                
/*
 * ring buffer based function tracer
 *
 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
 *
 * Based on code from the latency_tracer, that is:
 *
 *  Copyright (C) 2004-2006 Ingo Molnar
 *  Copyright (C) 2004 William Lee Irwin III
 */
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
#include <linux/fs.h>

#include "trace.h"

static notrace void function_reset(struct trace_array *tr)
{
	int cpu;

	tr->time_start = ftrace_now(tr->cpu);

	for_each_online_cpu(cpu)
		tracing_reset(tr->data[cpu]);
}

static notrace void start_function_trace(struct trace_array *tr)
{
	function_reset(tr);
	tracing_start_function_trace();
}

static notrace void stop_function_trace(struct trace_array *tr)
{
	tracing_stop_function_trace();
}

static notrace void function_trace_init(struct trace_array *tr)
{
	if (tr->ctrl)
		start_function_trace(tr);
}

static notrace void function_trace_reset(struct trace_array *tr)
{
	if (tr->ctrl)
		stop_function_trace(tr);
}

static notrace void function_trace_ctrl_update(struct trace_array *tr)
{
	if (tr->ctrl)
		start_function_trace(tr);
	else
		stop_function_trace(tr);
}

static struct tracer function_trace __read_mostly =
{
	.name	     = "ftrace",
	.init	     = function_trace_init,
	.reset	     = function_trace_reset,
	.ctrl_update = function_trace_ctrl_update,
#ifdef CONFIG_FTRACE_SELFTEST
	.selftest    = trace_selftest_startup_function,
#endif
};

static __init int init_function_trace(void)
{
	return register_tracer(&function_trace);
}

device_initcall(init_function_trace);