tracing: Add ftrace events for graph tracer (9106b693) · Commits · 戴 / test

kernel/trace/trace_functions_graph.c

+27 −1

Original line number	Diff line number	Diff line
		@@ -40,7 +40,7 @@ struct fgraph_data {
		#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
		#define TRACE_GRAPH_PRINT_PROC 0x8
		#define TRACE_GRAPH_PRINT_DURATION 0x10
		#define TRACE_GRAPH_PRINT_ABS_TIME 0X20
		#define TRACE_GRAPH_PRINT_ABS_TIME 0x20

		static struct tracer_opt trace_opts[] = {
		/* Display overruns? (for self-debug purpose) */
		@@ -1096,6 +1096,12 @@ print_graph_function(struct trace_iterator *iter)
		return TRACE_TYPE_HANDLED;
		}

		static enum print_line_t
		print_graph_function_event(struct trace_iterator *iter, int flags)
		{
		return print_graph_function(iter);
		}

		static void print_lat_header(struct seq_file *s)
		{
		static const char spaces[] = " " /* 16 spaces */
		@@ -1199,6 +1205,16 @@ static void graph_trace_close(struct trace_iterator *iter)
		}
		}

		static struct trace_event graph_trace_entry_event = {
		.type = TRACE_GRAPH_ENT,
		.trace = print_graph_function_event,
		};

		static struct trace_event graph_trace_ret_event = {
		.type = TRACE_GRAPH_RET,
		.trace = print_graph_function_event,
		};

		static struct tracer graph_trace __read_mostly = {
		.name = "function_graph",
		.open = graph_trace_open,
		@@ -1220,6 +1236,16 @@ static __init int init_graph_trace(void)
		{
		max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1);

		if (!register_ftrace_event(&graph_trace_entry_event)) {
		pr_warning("Warning: could not register graph trace events\n");
		return 1;
		}

		if (!register_ftrace_event(&graph_trace_ret_event)) {
		pr_warning("Warning: could not register graph trace events\n");
		return 1;
		}

		return register_tracer(&graph_trace);
		}

Admin message