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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