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    SubjectRe: [PATCH] tracing: add trace console
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    On Wed, 2011-11-16 at 09:48 -0500, Steven Rostedt wrote:
    > On Wed, 2011-11-16 at 15:30 +0100, Johannes Berg wrote:
    > > On Wed, 2011-11-16 at 15:25 +0100, Peter Zijlstra wrote:
    > >
    > > > > > kernel/trace/Kconfig | 13 ++++++++++
    > > > > > kernel/trace/Makefile | 2 +
    > > > > > kernel/trace/trace-console.c | 55 +++++++++++++++++++++++++++++++++++++++++++
    > > > > > 3 files changed, 70 insertions(+)
    > > > > >
    > > > > > --- a/kernel/trace/Kconfig 2011-11-16 11:11:27.000000000 +0100
    > > > > > +++ b/kernel/trace/Kconfig 2011-11-16 11:11:35.000000000 +0100
    > > > > > @@ -368,6 +368,19 @@ config BLK_DEV_IO_TRACE
    > > > > >
    > > > > > If unsure, say N.
    > > > > >
    > > > > > +config TRACE_CONSOLE
    > > > > > + tristate "Support for a tracing console"
    > > > > > + help
    > > > > > + Say M (or Y if you must, but this is not recommended)
    > > >
    > > > Why not?
    > >
    > > It'll always be registered and you have no way to turn it off then, so
    > > you can't trace without getting every printk. I didn't want to add extra
    > > API to toggle it, but building it in might be a bit odd that way.
    >
    > Actually, that's not quite true. You could just do:
    >
    > echo 0 > /debug/tracing/options/trace_printk

    Oh. Maybe I'll just remove it this then. I guess you kinda have to know
    (or be told) you want this anyway.

    johannes



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