trace-cmd report: Add -O offset for function pluginHEADmaster

When -O offset is added to trace-cmd report with the function plugin
enabled, it will display the offset of the functions along with their names.
This helps in finding exactly where a function was called by its parent.

 trace-cmd report -O parent -O offset
[..]
        rcuc/163-1330  [163]   740.653251: function: _raw_spin_lock+0x0  <-- rcu_cpu_kthread+0x4d8

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 22 insertions, 2 deletions

diff --git a/plugin_function.c b/plugin_function.c
index 1e88a7f7..5f13a21f 100644
--- a/plugin_function.c
+++ b/plugin_function.c
@@ -49,12 +49,20 @@ struct pevent_plugin_option plugin_options[] =
 		.set = 1,
 	},
 	{
+		.name = "offset",
+		.plugin_alias = "ftrace",
+		.description =
+		"Show function names as well as their offsets",
+		.set = 0,
+	},
+	{
 		.name = NULL,
 	}
 };
 
 static struct pevent_plugin_option *ftrace_parent = &plugin_options[0];
 static struct pevent_plugin_option *ftrace_indent = &plugin_options[1];
+static struct pevent_plugin_option *ftrace_offset = &plugin_options[2];
 
 static void add_child(struct func_stack *stack, const char *child, int pos)
 {
@@ -122,6 +130,18 @@ static int add_and_get_index(const char *parent, const char *child, int cpu)
 	return 0;
 }
 
+static void show_function(struct trace_seq *s, struct pevent *pevent,
+			  const char *func, unsigned long long function)
+{
+	unsigned long long offset;
+
+	trace_seq_printf(s, "%s", func);
+	if (ftrace_offset->set) {
+		offset = pevent_find_function_address(pevent, function);
+		trace_seq_printf(s, "+0x%x ", (int)(function - offset));
+	}
+}
+
 static int function_handler(struct trace_seq *s, struct pevent_record *record,
 			    struct event_format *event, void *context)
 {
@@ -148,14 +168,14 @@ static int function_handler(struct trace_seq *s, struct pevent_record *record,
 	trace_seq_printf(s, "%*s", index*3, "");
 
 	if (func)
-		trace_seq_printf(s, "%s", func);
+		show_function(s, pevent, func, function);
 	else
 		trace_seq_printf(s, "0x%llx", function);
 
 	if (ftrace_parent->set) {
 		trace_seq_printf(s, " <-- ");
 		if (parent)
-			trace_seq_printf(s, "%s", parent);
+			show_function(s, pevent, parent, pfunction);
 		else
 			trace_seq_printf(s, "0x%llx", pfunction);
 	}