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From: Robert Watson <rwatson@FreeBSD.org>
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To: Daniel Braniss <danny@cs.huji.ac.il>
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Cc: freebsd-stable@freebsd.org
Subject: Re: is dtrace usable?
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On Sat, 6 Mar 2010, Daniel Braniss wrote:

> 	link_elf_obj: symbol lapic_cyclic_clock_func undefined
>
> when trying
> 	kldload dtraceall this is with a fearly resent 8-stable
>
> I'm trying to help Rick Maclem debug the NSF/UDP problem, and I thought it 
> would be a good chance to learn dtrace, but :-(

Take a look at the DTrace configuration information here:

   http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/dtrace.html

And here:

   http://wiki.freebsd.org/DTrace

It looks like options KDTRACE_HOOKS may not be defined in your kernel 
configuration, but there are some other details, such as WITH_CTF=1, that 
you'll also need to make sure are appropriately set.

Robert