Re: DTrace on Xen?

[christos%astron.com@localhost (Christos Zoulas)]

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?

christos