Re: DTrace on Xen?

[John Nemeth <jnemeth%cue.bc.ca@localhost>]

On Apr 9,  1:50am, Christos Zoulas wrote:
} In article <20160409012248.GA27939%panix.com@localhost>,
} Thor Lancelot Simon  <tls%panix.com@localhost> wrote:
} >Next try: is DTrace (particularly FBT) expected to work on NetBSD/xen?
} >
} >I'm struggling to get some grasp on why I/O to SCSI disks uses *25X* more
} >CPU in "interrupt" time on the same system under NetBSD/xen than under
} >NetBSD/amd64.  Kernel profiling clearly does not work, so I'm hoping to
} >get somewhere with DTrace even if I have to do much of what gprof would
} >do for me by hand.
} >
} >This is -- among other things -- crippling the Foundation's pkgsrc build
} >server.  So I could use some help, if anyone's got it to give.
} 
} Why doesn't kernel profiling work.?
} Does the xen kernel has KDTRACE_HOOKS, and is it built with symbols?

     Xen kernels are supposedly built with symbols.  However, when
trying to do MODULAR Xen kernels, I found that I could only load
very simple modules.  If I try to load a more complex, such as a
filesystem, it fails due to symbols not being found.

}-- End of excerpt from Christos Zoulas