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

Karim Yaghmour
2006-09-15T22:22:28Z

Ingo Molnar wrote:
> that is not true at all. Yes, an INT3 based kprobe might be expensive if
> +0.5 usecs per tracepoint (on a 1GHz CPU) is an issue to you - but that
> is "only" an implementation detail, not a conceptual property.
> Especially considering that help (djprobes) is on the way. And in the

djprobes has been "on the way" for some time now. Why don't you at
least have the intellectual honesty to use the same rules you've
repeatedly used against ltt elsewhere in this thread -- i.e. what
it does today is what it is, and what it does today isn't worth
bragging about. But that would be too much to ask of you Ingo,
wouldn't it?

But, sarcasm aside, even if this mechanism existed it still wouldn't
resolve the need for static markup. It would just make djprobe a
likelier candidate for tools that cannot currently rely on kprobes.

> NOTE: i still accept the temporary (or non-temporary) introduction of
> static markers, to help dynamic tracing. But my expectation is that
> these markers will be less intrusive than static tracepoints, and a lot
> more flexible.

Chalk one up for nice endorsement and another for arbitrary distinction.

Karim