Re: [PATCH][GIT PULL] tracing: add function profiler

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> > If you want exact function count profiling we could try to do 
> > something perf counter based, eg. stick a software counter in 
> > the mcount thingy.
> 
> I'd like to get the function graph version working, in order to 
> calculate the times spent in each funtion, then I can see how we 
> can (if possible) convert it over to perf counters. :-/

the perf counters angle is definitely worth pursuing (for 
completeness of the scheme Peter is working on), but please lets not 
throw the baby out with the bath water: in-kernel histogram 
collection has real value.

It's _much_ faster than any user-space counter-part, especially for 
such things as branch tracing or function tracing.

	Ingo
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