On Thu, 24 Jan 2008, Daniel Walker wrote:

>
> On Thu, 2008-01-24 at 15:36 -0500, Steven Rostedt wrote:
> > Hi all,
> >
> > I'm about to gut the RT latency tracer with the version I'm pushing
> > upstream. This will be some of the changes:
> >
>
> Do you have all the functionality of the prior tracer ? Specifically the
> histogram support .. I can vouch for the fact that it's getting used.. I
> would prefer you don't gut the current tracer unless you have the same
> level of functionality ..

OK, I didn't even know the histogram worked.

Which histogram did you use? all both? I'll try to implement it for
upstream then, and port that over to -rt.

Whenever there's a push to get part of the -rt kernel upstream, we replace
what is in RT for what goes mainline. I'm trying hard to keep the same
functionality, but the way it works changes a bit so we gain some more
functionality while losing a bit of others. One thing is that we always
trace all CPUS (except for preempt/irqs off max).

Another is that we don't print traces on oops (yet). Although I did
scalvage the PREEMPT_TRACE to print that.

Let me know if you use all the histograms and I'll see if I can get them
in tomorrow.

-- Steve

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