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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2008-12-08 01:56:06 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-08 13:24:52 +0100 |
| commit | decbec3838d10ecd7aabdb4c0e05aac0e5f5dc0c (patch) | |
| tree | e4427f55892b9ab4cd80c0f18d22dbb21e78699f /kernel | |
| parent | ftrace: use init_struct_pid as swapper pid (diff) | |
| download | linux-decbec3838d10ecd7aabdb4c0e05aac0e5f5dc0c.tar.xz linux-decbec3838d10ecd7aabdb4c0e05aac0e5f5dc0c.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_functions_graph.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c index 32b7fb9a19df..af60eef4cbcc 100644 --- a/kernel/trace/trace_functions_graph.c +++ b/kernel/trace/trace_functions_graph.c @@ -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, + .name = "function_graph", + .init = graph_trace_init, + .reset = graph_trace_reset, + .print_line = print_graph_function, + .print_header = print_graph_headers, .flags = &tracer_flags, }; |