Re: [PATCH 2/8] tracing: create automated trace defines

[Steven Rostedt]

On Tue, 21 Apr 2009, Jeremy Fitzhardinge wrote:

> Mathieu Desnoyers wrote:
> > * Andi Kleen (andi@xxxxxxxxxxxxxx) wrote:
> >   
> > > Mathieu Desnoyers <compudj@xxxxxxxxxxxxxxxxxx> writes:
> > > 
> > >     
> > > > Given how slow function calls are, at least on x86,
> > > >       
> > > That was with frame pointers right? Frame pointers tend to make
> > > function calls slow.
> > > 
> > >     
> > 
> > Looking at my .config, CONFIG_FRAME_POINTER is disabled here. So we
> > should probably expect an even worse performance impact if we enable
> > them.
> 
> I tried disabling frame pointers, but it looked to me like tracing selects
> them.  Did I misread, or perhaps it was some other config option doing it...

It is needed for the function tracer (gcc -pg wont work without it). It is 
the only tracer that selects it.

-- Steve

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