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-rw-r--r--kernel/trace/trace_functions.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
new file mode 100644
index 00000000000..31214489797
--- /dev/null
+++ b/kernel/trace/trace_functions.c
@@ -0,0 +1,81 @@
+/*
+ * 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 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 void start_function_trace(struct trace_array *tr)
+{
+ tr->cpu = get_cpu();
+ function_reset(tr);
+ put_cpu();
+
+ tracing_start_cmdline_record();
+ tracing_start_function_trace();
+}
+
+static void stop_function_trace(struct trace_array *tr)
+{
+ tracing_stop_function_trace();
+ tracing_stop_cmdline_record();
+}
+
+static void function_trace_init(struct trace_array *tr)
+{
+ if (tr->ctrl)
+ start_function_trace(tr);
+}
+
+static void function_trace_reset(struct trace_array *tr)
+{
+ if (tr->ctrl)
+ stop_function_trace(tr);
+}
+
+static 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);