tracing, function: Fix trace header to follow context-info option
The header display of function tracer does not follow the context-info option, so field names are displayed even if this option is off. Added check for TRACE_ITER_CONTEXT_INFO trace_flags. With following commands: # echo function > ./current_tracer # echo 0 > options/context-info # cat trace This is what it looked like before: # tracer: function # # TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | add_preempt_count <-schedule rcu_note_context_switch <-schedule ... This is what it looks like now: # tracer: function # _raw_spin_unlock_irqrestore <-hrtimer_try_to_cancel ... Signed-off-by: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/1307113131-10045-4-git-send-email-jolsa@redhat.com Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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@ -2053,6 +2053,9 @@ void trace_default_header(struct seq_file *m)
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{
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struct trace_iterator *iter = m->private;
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if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
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return;
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if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
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/* print nothing if the buffers are empty */
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if (trace_empty(iter))
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