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

From: Nick Piggin
Date: Sun Sep 17 2006 - 13:02:37 EST


Hi,

Roman Zippel wrote:
Hi,

On Sun, 17 Sep 2006, Ingo Molnar wrote:


The foremost issue is still that there is only limited kprobes support.

The main issue in supporting static tracers are the tracepoints and so far I haven't seen any convincing proof that the maintainance overhead of dynamic and static tracepoints has to be significantly different.

Above, weren't you asking about static vs dynamic trace-*points*, rather
than the implementation of the tracer itself. I think Ingo said that
some "static tracepoints" (eg. annotation) could be acceptable.

to both points i (and others) already replied in great detail - please follow up on them. (I can quote message-IDs if you cannot find them.)


What you basically tell me is (rephrased to make it more clear): Implement kprobes support or fuck off! You make it very clear, that you're unwilling to support static tracers even to point to make _any_ static trace support

Now it seems you are talking about compiled vs runtime inserted traces,
which is different. And so far I have to agree with Ingo: dynamic seems
to be better in almost every way. Implementation may be more complex,
but that's never stood in the way of a better solution before, and I
don't think anybody has shown it to be prohibitive ("I won't implement
it" notwithstanding)

--
SUSE Labs, Novell Inc.
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