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

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

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

> > Signed-off-by: Fabio Fantoni <fabio.fantoni@xxxxxxx>
> > ---
> >   tools/Makefile |    2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/Makefile b/tools/Makefile
> > index e7a983b..77a3522 100644
> > --- a/tools/Makefile
> > +++ b/tools/Makefile
> > @@ -174,7 +174,7 @@ qemu-xen-dir-force-update:
> >         fi
> >   
> >   ifeq ($(debug),y)
> > -QEMU_XEN_ENABLE_DEBUG := --enable-debug
> > +QEMU_XEN_ENABLE_DEBUG := --enable-debug --enable-trace-backend=stderr
> >   else
> >   QEMU_XEN_ENABLE_DEBUG :=
> >   endif

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