Re: [PATCH 0/2] ftrace: updates to tip

From: Ingo Molnar
Date: Sun Jan 18 2009 - 02:28:21 EST

* Ingo Molnar <mingo@xxxxxxx> wrote:

> * Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> > > This would allow the creation of "surgical" one-time traces - of
> > > events and functions one is specifically interested in.
> >
> > This all sounds great, but it would add a lot of conditionals into a
> > extremely hot function tracer path. [...]
> Why would we need more than exactly one unlikely() condition to handle
> all of this?

We could even do it with zero branches, burdening none of the hotpaths of
existing functionality. Hm?

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