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

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

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?

> > > 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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