Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

Ingo Molnar
2006-09-17T21:48:08Z

* Roman Zippel <zippel@linux-m68k.org> wrote:

> > As an aside, there are quite a number of different types of tracing
> > things (mostly static, compile out) in the kernel. Everything from
> > blktrace to various userspace notifiers to lots of /proc/stuff could
> > be considered a type of static event tracing. I don't know what my
> > point is other than all these big, disjoint frameworks trying to be
> > pushed into the kernel. Are there any plans for working some things
> > together, or is that somebody else's problem?
>
> All the controversy around static tracing in general and LTT in
> specific has prevented this so far...

BLKTRACE is a special-purpose tracing facility limited to one subsystem
and written and maintained by the /same/ person (Jens) who maintains
that subsystem. He maintains the subsystem, the tracer and the userspace
tool that extracts the tracer data.

LTT on the other hand is a static tracer that affects _all_ subsystems.
That is a very different situation from a maintainance overhead POV, and
i believe you must know that.

your suggestion that this controversy has prevented consolidation in
this area is baseless and misleading, please correct or retract it.

Ingo