tracing: Add graph output support for irqsoff tracer

Add function graph output to irqsoff tracer.

The graph output is enabled by setting new 'display-graph' trace option.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
LKML-Reference: <1270227683-14631-4-git-send-email-jolsa@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index de5f6518aba..dd11c830eb8 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -179,7 +179,7 @@ unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
         return ret;
 }
 
-static int __trace_graph_entry(struct trace_array *tr,
+int __trace_graph_entry(struct trace_array *tr,
                                 struct ftrace_graph_ent *trace,
                                 unsigned long flags,
                                 int pc)
@@ -246,7 +246,7 @@ int trace_graph_thresh_entry(struct ftrace_graph_ent *trace)
                 return trace_graph_entry(trace);
 }
 
-static void __trace_graph_return(struct trace_array *tr,
+void __trace_graph_return(struct trace_array *tr,
                                 struct ftrace_graph_ret *trace,
                                 unsigned long flags,
                                 int pc)
@@ -1093,6 +1093,11 @@ print_graph_function_flags(struct trace_iterator *iter, u32 flags)
                 trace_assign_type(field, entry);
                 return print_graph_return(&field->ret, s, entry, iter, flags);
         }
+        case TRACE_STACK:
+        case TRACE_FN:
+                /* dont trace stack and functions as comments */
+                return TRACE_TYPE_UNHANDLED;
+
         default:
                 return print_graph_comment(s, entry, iter, flags);
         }
@@ -1170,12 +1175,12 @@ void print_graph_headers_flags(struct seq_file *s, u32 flags)
         seq_printf(s, "               |   |   |   |\n");
 }
 
-static void print_graph_headers(struct seq_file *s)
+void print_graph_headers(struct seq_file *s)
 {
         print_graph_headers_flags(s, tracer_flags.val);
 }
 
-static void graph_trace_open(struct trace_iterator *iter)
+void graph_trace_open(struct trace_iterator *iter)
 {
         /* pid and depth on the last trace processed */
         struct fgraph_data *data;
@@ -1210,7 +1215,7 @@ static void graph_trace_open(struct trace_iterator *iter)
         pr_warning("function graph tracer: not enough memory\n");
 }
 
-static void graph_trace_close(struct trace_iterator *iter)
+void graph_trace_close(struct trace_iterator *iter)
 {
         struct fgraph_data *data = iter->private;