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

Mathieu Desnoyers
2006-09-18T14:47:10Z

Hi Jes,

* Jes Sorensen (jes@sgi.com) wrote:
> Everything has performance limitations, you keep running around touting
> that static is the only thing thats not a problem. Now show us the
> numbers!
>

If I may : I showed in a precedent thread that kprobes impact doubled LTTng's
impact on the system. If you are interested in numbers about LTTng, here they
are :

"The LTTng tracer : A Low Impact Performance and Behavior Monitor for GNU/Linux"
(OLS2006)
http://ltt.polymtl.ca/papers/desnoyers-ols2006.pdf

(and for Ingo : I haven't rerun the tests on your modified kprobes, it will
come in time. But I do not really expect that 30-50 cycles compared to 1500
will make a very big difference.)

Mathieu

OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68