Re: [PATCH 2/4] tracing: add event trace infrastructure

[Ingo Molnar]

* Pekka Enberg <penberg@xxxxxxxxxxxxxx> wrote:

> Hi Andrew,
> 
> On Wed, Feb 25, 2009 at 10:28 AM, Andrew Morton
> <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> > A better approach would be to design simple, robust kernel interfaces
> > which make sense and which aren't made all complex by putting the user
> > interface in kernel space.  And to maintain corresponding userspace
> > tools which manipulate and present the IO from those kernel interfaces.
> 
> We did this for kmemtrace and quite frankly, I usually end up 
> spending more time figuring out how to export the data from a 
> virtual machine than actually analyzing the results. What 
> makes ftrace so cool is the fact that it has almost 
> zero-overhead for setup and that the text-based data format 
> plays well with simple scripting tools available everywhere.

I just tried to write a similar reply - and ended up with a long 
5 page mail which was just repeating points others and me made 
before.

Instead i'll now print out your reply and will hang it on the 
wall ... ;-)

	Ingo
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