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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) | |
3928a8a2 | 26 | tracing_reset(tr, cpu); |
1b29b018 SR |
27 | } |
28 | ||
e309b41d | 29 | static void start_function_trace(struct trace_array *tr) |
1b29b018 | 30 | { |
26bc83f4 | 31 | tr->cpu = get_cpu(); |
1b29b018 | 32 | function_reset(tr); |
26bc83f4 SR |
33 | put_cpu(); |
34 | ||
41bc8144 | 35 | tracing_start_cmdline_record(); |
1b29b018 SR |
36 | tracing_start_function_trace(); |
37 | } | |
38 | ||
e309b41d | 39 | static void stop_function_trace(struct trace_array *tr) |
1b29b018 SR |
40 | { |
41 | tracing_stop_function_trace(); | |
41bc8144 | 42 | tracing_stop_cmdline_record(); |
1b29b018 SR |
43 | } |
44 | ||
1c80025a | 45 | static int function_trace_init(struct trace_array *tr) |
1b29b018 | 46 | { |
c76f0694 | 47 | start_function_trace(tr); |
1c80025a | 48 | return 0; |
1b29b018 SR |
49 | } |
50 | ||
e309b41d | 51 | static void function_trace_reset(struct trace_array *tr) |
1b29b018 | 52 | { |
c76f0694 | 53 | stop_function_trace(tr); |
1b29b018 SR |
54 | } |
55 | ||
9036990d SR |
56 | static void function_trace_start(struct trace_array *tr) |
57 | { | |
58 | function_reset(tr); | |
59 | } | |
60 | ||
1b29b018 SR |
61 | static struct tracer function_trace __read_mostly = |
62 | { | |
3ce83aea | 63 | .name = "function", |
1b29b018 SR |
64 | .init = function_trace_init, |
65 | .reset = function_trace_reset, | |
9036990d | 66 | .start = function_trace_start, |
60a11774 SR |
67 | #ifdef CONFIG_FTRACE_SELFTEST |
68 | .selftest = trace_selftest_startup_function, | |
69 | #endif | |
1b29b018 SR |
70 | }; |
71 | ||
72 | static __init int init_function_trace(void) | |
73 | { | |
74 | return register_tracer(&function_trace); | |
75 | } | |
76 | ||
77 | device_initcall(init_function_trace); |