Re: [ltt-dev] Re: [PATCH] LTT for 2.5.38 1/9: Core infrastructure

From: Ingo Molnar (
Date: Sun Sep 22 2002 - 16:39:10 EST

On Sun, 22 Sep 2002, bob wrote:

> There is no drag on the kernel. The concept that we are working on is
> consistent with your below recommendations. Only place in the kernel an
> efficient tracing infrastructure, keep trace points as patches. [...]

well, this is not the impression i got from the patches posted to lkml ...

> [...] This adds no overhead to kernel, allows your suggested patches to
> use a standard efficient infrastructure, reduces replicated work from
> specific problem to specific problem.

so why not keep the core parts as separate patches as well? If it does
nothing then i dont see why it should get into the kernel proper.

> > my problem with this stuff is conceptual: it introduces a constant drag on
> > the kernel sourcecode, while 99% of development will not want to trace,
> If you care about performance you will want to trace. On two previous
> kernels I have worked on I've heard this comment. Once the
> infrastructure was in it was used and appreciated.

(i think you have not read what i have written. I use tracing pretty
frequently, and no, i dont need tracing in the kernel, during development
i can apply patches to kernel trees just fine.)


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