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Commit decbec38 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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tracing/function-graph-tracer: implement a print_headers function 



Impact: provide trace headers to explain a bit the output

This patch implements the print_headers callback for the function graph
tracer. These headers are output according to the current trace options.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 21bbecda

kernel/trace/trace_functions_graph.c

+29 −4
Original line number Diff line number Diff line
@@ -570,11 +570,36 @@ print_graph_function(struct trace_iterator *iter) 
	}

}



static void print_graph_headers(struct seq_file *s)

{

	/* 1st line */

	seq_printf(s, "# ");

	if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)

		seq_printf(s, "CPU ");

	if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)

		seq_printf(s, "TASK/PID     ");

	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)

		seq_printf(s, "OVERHEAD/");

	seq_printf(s, "DURATION            FUNCTION CALLS\n");



	/* 2nd line */

	seq_printf(s, "# ");

	if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)

		seq_printf(s, "|   ");

	if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)

		seq_printf(s, "|      |     ");

	if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {

		seq_printf(s, "|        ");

		seq_printf(s, "|                   |   |   |   |\n");

	} else

		seq_printf(s, "    |               |   |   |   |\n");

}

static struct tracer graph_trace __read_mostly = {

	.name	     	= "function_graph",

	.init	     	= graph_trace_init,

	.reset	     	= graph_trace_reset,

	.print_line	= print_graph_function,

	.print_header	= print_graph_headers,

	.flags		= &tracer_flags,

};