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: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -570,11 +570,36 @@ print_graph_function(struct trace_iterator *iter)
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}
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}
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static void print_graph_headers(struct seq_file *s)
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{
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/* 1st line */
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seq_printf(s, "# ");
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if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
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seq_printf(s, "CPU ");
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if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
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seq_printf(s, "TASK/PID ");
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if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)
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seq_printf(s, "OVERHEAD/");
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seq_printf(s, "DURATION FUNCTION CALLS\n");
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/* 2nd line */
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seq_printf(s, "# ");
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if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
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seq_printf(s, "| ");
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if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
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seq_printf(s, "| | ");
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if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
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seq_printf(s, "| ");
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seq_printf(s, "| | | | |\n");
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} else
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seq_printf(s, " | | | | |\n");
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}
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static struct tracer graph_trace __read_mostly = {
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.name = "function_graph",
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.init = graph_trace_init,
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.reset = graph_trace_reset,
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.print_line = print_graph_function,
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.print_header = print_graph_headers,
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.flags = &tracer_flags,
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};
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