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    SubjectRe: [PATCH] tracing: add trace console
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    On Wed, 2011-11-16 at 10:10 -0500, Christoph Hellwig wrote:
    > On Wed, Nov 16, 2011 at 11:18:48AM +0100, Johannes Berg wrote:
    > > From: Johannes Berg <johannes.berg@intel.com>
    > >
    > > As described in the Kconfig entry, logging printk
    > > output is useful to correlate (existing) printk
    > > debugging with (existing) tracing. The easiest way
    > > to achieve this is to register a console that just
    > > calls trace_printk(), which this module does.
    >
    > I'd much prefer if we could have it built in all the time, but had a
    > way to enable it at runtime, just like all the "real" tracepoints.

    That's possible, basically adding a tracepoints to printk -- that would
    even catch everything and not require setting the console level (which
    has its advantages too since other consoles might be slow).

    It's a completely different thing though. I did it this way because it
    was trivial to do out of tree for a quick test I was doing yesterday.
    Doing it the other way is obviously more intrusive in core code.

    johannes



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