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Re: [libvirt] [PATCH 1/2] Add dtrace static probes in libvirtd



On Thu, Oct 21, 2010 at 09:59:55PM +0200, Daniel Veillard wrote:
> On Thu, Oct 21, 2010 at 07:19:32PM +0100, Daniel P. Berrange wrote:
> > Adds initial support for dtrace static probes in libvirtd
> > daemon, assuming use of systemtap dtrace compat shim on
> > Linux. The probes are inserted for network client connect,
> > disconnect, TLS handshake states and authentication protocol
> > states.
> > 
> > This can be tested by running the xample program and then
> > attempting to connect with any libvirt client (virsh,
> > virt-manager, etc).
> > 
> >  # stap examples/systemtap/client.stp
> >   Client fd=44 connected readonly=0
> >   Client fd=44 auth polkit deny pid:24997,uid:500
> >   Client fd=44 disconnected
> >   Client fd=46 connected readonly=1
> >   Client fd=46 auth sasl allow test
> >   Client fd=46 disconnected
> > 
> > For unknown reasons, libvirtd must be restarted after
> > the stap script is launched, otherwise the probes are
> > not enabled. This bug needs to be fixed, probably in
> > systemtap itself, to allow probing an existing running
> > daemon.
> 
>   Wasn't that problem found ? I though so ...

Yes it is partially solved, I'll remove this comment since
it isn't really relevant to the changeset.

Daniel
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