Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

Steven Rostedt
2008-09-27T19:29:00Z

On Sat, 27 Sep 2008, Ingo Molnar wrote:
>
> * Steven Rostedt <rostedt@goodmis.org> wrote:
>
> >
> > I hate trips where my email box becomes filled. I skip over a lot of
> > emails that I should not have.
> >
> > On Fri, 19 Sep 2008, Ingo Molnar wrote:
> > >
> > > What is needed is to set kernel/trace/trace.c's tracing_disabled
> > > variable to 0. I've Cc:-ed Steve Rostedt - Steve, why is there no easy
> > > ad-hoc way to trigger a stop-tracing event without elaborate changes?
> >
> > I think I added a way to do this. Hmm, I think it was in -rt that I added
> > it, and have not gotten around to sending you the updates.
> >
> > Yes, we need an easy way to disable the tracer. I think we have
> > ftrace_disable() function. Perhaps that only disables tracing that
> > checks the tracing_disabled variable.
>
> we have kill_ftrace(), but that will permanently zap it.

OK, on Monday, as I work on getting ftrace to use the ring buffer, I'll
also look to see which features are only in -rt that need to go to tip.

-- Steve