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1b29b018 SR |
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 | */ | |
1b29b018 SR |
12 | #include <linux/debugfs.h> |
13 | #include <linux/uaccess.h> | |
14 | #include <linux/ftrace.h> | |
2e0f5761 | 15 | #include <linux/fs.h> |
1b29b018 SR |
16 | |
17 | #include "trace.h" | |
18 | ||
e309b41d | 19 | static void function_reset(struct trace_array *tr) |
1b29b018 SR |
20 | { |
21 | int cpu; | |
22 | ||
750ed1a4 | 23 | tr->time_start = ftrace_now(tr->cpu); |
1b29b018 SR |
24 | |
25 | for_each_online_cpu(cpu) | |
26 | tracing_reset(tr->data[cpu]); | |
27 | } | |
28 | ||
e309b41d | 29 | static void start_function_trace(struct trace_array *tr) |
1b29b018 SR |
30 | { |
31 | function_reset(tr); | |
41bc8144 | 32 | tracing_start_cmdline_record(); |
1b29b018 SR |
33 | tracing_start_function_trace(); |
34 | } | |
35 | ||
e309b41d | 36 | static void stop_function_trace(struct trace_array *tr) |
1b29b018 SR |
37 | { |
38 | tracing_stop_function_trace(); | |
41bc8144 | 39 | tracing_stop_cmdline_record(); |
1b29b018 SR |
40 | } |
41 | ||
e309b41d | 42 | static void function_trace_init(struct trace_array *tr) |
1b29b018 SR |
43 | { |
44 | if (tr->ctrl) | |
45 | start_function_trace(tr); | |
46 | } | |
47 | ||
e309b41d | 48 | static void function_trace_reset(struct trace_array *tr) |
1b29b018 SR |
49 | { |
50 | if (tr->ctrl) | |
51 | stop_function_trace(tr); | |
52 | } | |
53 | ||
e309b41d | 54 | static void function_trace_ctrl_update(struct trace_array *tr) |
1b29b018 SR |
55 | { |
56 | if (tr->ctrl) | |
57 | start_function_trace(tr); | |
58 | else | |
59 | stop_function_trace(tr); | |
60 | } | |
61 | ||
62 | static struct tracer function_trace __read_mostly = | |
63 | { | |
64 | .name = "ftrace", | |
65 | .init = function_trace_init, | |
66 | .reset = function_trace_reset, | |
67 | .ctrl_update = function_trace_ctrl_update, | |
60a11774 SR |
68 | #ifdef CONFIG_FTRACE_SELFTEST |
69 | .selftest = trace_selftest_startup_function, | |
70 | #endif | |
1b29b018 SR |
71 | }; |
72 | ||
73 | static __init int init_function_trace(void) | |
74 | { | |
75 | return register_tracer(&function_trace); | |
76 | } | |
77 | ||
78 | device_initcall(init_function_trace); |