ftrace: remove notrace
[linux-2.6.git] / kernel / trace / trace_functions.c
1 /*
2  * ring buffer based function tracer
3  *
4  * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
5  * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
6  *
7  * Based on code from the latency_tracer, that is:
8  *
9  *  Copyright (C) 2004-2006 Ingo Molnar
10  *  Copyright (C) 2004 William Lee Irwin III
11  */
12 #include <linux/debugfs.h>
13 #include <linux/uaccess.h>
14 #include <linux/ftrace.h>
15 #include <linux/fs.h>
16
17 #include "trace.h"
18
19 static void function_reset(struct trace_array *tr)
20 {
21         int cpu;
22
23         tr->time_start = ftrace_now(tr->cpu);
24
25         for_each_online_cpu(cpu)
26                 tracing_reset(tr->data[cpu]);
27 }
28
29 static void start_function_trace(struct trace_array *tr)
30 {
31         function_reset(tr);
32         tracing_start_function_trace();
33 }
34
35 static void stop_function_trace(struct trace_array *tr)
36 {
37         tracing_stop_function_trace();
38 }
39
40 static void function_trace_init(struct trace_array *tr)
41 {
42         if (tr->ctrl)
43                 start_function_trace(tr);
44 }
45
46 static void function_trace_reset(struct trace_array *tr)
47 {
48         if (tr->ctrl)
49                 stop_function_trace(tr);
50 }
51
52 static void function_trace_ctrl_update(struct trace_array *tr)
53 {
54         if (tr->ctrl)
55                 start_function_trace(tr);
56         else
57                 stop_function_trace(tr);
58 }
59
60 static struct tracer function_trace __read_mostly =
61 {
62         .name        = "ftrace",
63         .init        = function_trace_init,
64         .reset       = function_trace_reset,
65         .ctrl_update = function_trace_ctrl_update,
66 #ifdef CONFIG_FTRACE_SELFTEST
67         .selftest    = trace_selftest_startup_function,
68 #endif
69 };
70
71 static __init int init_function_trace(void)
72 {
73         return register_tracer(&function_trace);
74 }
75
76 device_initcall(init_function_trace);