[RFC][PATCH] tracing: Add irq, preempt-count and need resched infoto default trace output

[Steven Rostedt]

Thomas,

Instead of making latency format default, I decided to add the irq
information to the  default format. As both you and Peter have said that
traces are useless without it, why not just include it. I personally
prefer the default layout, but I do agree having the irq info is
important. I added an option that lets you disable it and make the
output like the old way, but by default the information is available.

What do you think of this?

I also plan on making another patch that adds some of the useful
information of the latency header to the default header as well. That
will be the # of events in buff compared to the # of events written
(counting dropped events too), and perhaps even the # of CPUS.

-- Steve

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