Re: [Xen-devel] [PATCH] tools: adds tracer on qemu-xen debug configure options

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 10 Oct 2013, Ian Campbell wrote:
> On Thu, 2013-10-10 at 10:14 +0200, Fabio Fantoni wrote:
> > Il 03/10/2013 15:35, Fabio Fantoni ha scritto:
> > > Il 03/10/2013 15:08, Ian Campbell ha scritto:
> > >> On Fri, 2013-09-27 at 16:00 +0200, Fabio Fantoni wrote:
> > >>> When building tools in debug mode (debug=y), pass also
> > >>> --enable-trace-backend=stderr when configuring qemu-xen.
> > >>> Useful to improve debug.
> > >> What does this actually do in practice? More logging
> > >> in /var/log/xen/qemu-dm-$dom.log or something else?
> > >
> > > Yes, I think that stderr backend is good because the log will go on 
> > > /var/log/xen/qemu-dm-$dom.log (easy and fast).
> > > To use it must be configured with some qemu parameters, containing the 
> > > type of events to log. Setting it with "device_model_args" should be 
> > > sufficent instead adding other libxl option, and this should be used 
> > > only on some debug case.
> > > All details here:
> > > http://git.qemu.org/?p=qemu.git;a=blob;f=docs/tracing.txt
> > >
> > 
> > Any hints on this?
> 
> I missed Stefano's ack and was waiting for a qemu person to chime in,
> sorry.
> 
> There was some previous discussion about whether this kind tracing was
> the right solution:
> http://thread.gmane.org/gmane.comp.emulators.xen.devel/164858/focus=165379
> 
> I guess however that enabling this in our own debug builds of qemu (i.e.
> this patch) is OK, but long term something which can work for distro
> qemu builds would be better.
 
Passing --enable-trace-backend=stderr is a good idea.
Ack for this patch.

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