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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: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2008-12-08 01:56:06 +01:00 committed by Ingo Molnar
parent 21bbecdaae
commit decbec3838
1 changed files with 29 additions and 4 deletions
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33
kernel/trace/trace_functions_graph.c
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@ -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 = { static struct tracer graph_trace __read_mostly = {
.name = "function_graph", .name = "function_graph",
.init = graph_trace_init, .init = graph_trace_init,
.reset = graph_trace_reset, .reset = graph_trace_reset,
.print_line = print_graph_function, .print_line = print_graph_function,
.print_header = print_graph_headers,
.flags = &tracer_flags, .flags = &tracer_flags,
}; };