On 04/18/2017 07:49 PM, Steven Rostedt wrote:

On Tue, 18 Apr 2017 18:42:32 -0700
Frank Rowand [off-list ref] wrote:

quoted

And of course the other issue with using tracepoints is the extra space
required to hold the tracepoint info.  With the pr_debug() approach, the
space usage can be easily removed for a production kernel via a config
option.

Now if you are saying you want to be able to enable debugging without
the tracing infrastructure I would agree. As the tracing infrastructure
is large. But I'm working on shrinking it more.

The primary consumers of OF_DYNAMIC seem to be pseries and powernv where
we are generally going to see the trace infrastructure enabled by
default in production.

-Tyrel

quoted

Tracepoints are wonderful technology, but not always the proper tool to
use for debug info.

But if you are going to have tracing enabled regardless, adding a few
more tracepoints isn't going to make the difference.

-- Steve

quoted

quoted

If Rob wants to convert printk() style data to trace data (and I can't
convince him otherwise) then I will have further comments on this specific
patch.