2 * ring buffer based function tracer
4 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
5 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
7 * Based on code from the latency_tracer, that is:
9 * Copyright (C) 2004-2006 Ingo Molnar
10 * Copyright (C) 2004 William Lee Irwin III
12 #include <linux/debugfs.h>
13 #include <linux/uaccess.h>
14 #include <linux/ftrace.h>
19 static void function_reset(struct trace_array
*tr
)
23 tr
->time_start
= ftrace_now(tr
->cpu
);
25 for_each_online_cpu(cpu
)
26 tracing_reset(tr
, cpu
);
29 static void start_function_trace(struct trace_array
*tr
)
35 tracing_start_cmdline_record();
36 tracing_start_function_trace();
39 static void stop_function_trace(struct trace_array
*tr
)
41 tracing_stop_function_trace();
42 tracing_stop_cmdline_record();
45 static int function_trace_init(struct trace_array
*tr
)
47 start_function_trace(tr
);
51 static void function_trace_reset(struct trace_array
*tr
)
53 stop_function_trace(tr
);
56 static void function_trace_start(struct trace_array
*tr
)
61 static struct tracer function_trace __read_mostly
=
64 .init
= function_trace_init
,
65 .reset
= function_trace_reset
,
66 .start
= function_trace_start
,
67 #ifdef CONFIG_FTRACE_SELFTEST
68 .selftest
= trace_selftest_startup_function
,
72 static __init
int init_function_trace(void)
74 return register_tracer(&function_trace
);
77 device_initcall(init_function_trace
);