Bug#563847: Please enable the f-trace tracers

[maximilian attems <max@stro.at>]

On Thu, Jan 28, 2010 at 04:25:47PM -0700, dann frazier wrote:
> 
> Of FUNCTION_TRACER, Kconfig says:
>  If it's runtime disabled
>    (the bootup default), then the overhead of the instructions is very
>      small and not measurable even in micro-benchmarks.
> 
> And for STACK_TRACER:
>  If this is configured with DYNAMIC_FTRACE then it will not have any
>  overhead while the stack tracer is disabled.
> 
> So I've gone ahead and enabled them in svn.

well it depends on FRAME_POINTER.

i'd consider the feature worth it, but aboves has a measurable
although small performance hit on x86_32.