From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fabio Fantoni <fabio.fantoni@m2r.biz>
Subject: Re: [PATCH] tools: adds tracer on qemu-xen debug
	configure options
Date: Thu, 10 Oct 2013 10:14:53 +0200
Message-ID: <525661FD.3040105@m2r.biz>
References: <1380290446-3737-1-git-send-email-fabio.fantoni@m2r.biz>
	<1380805706.25936.110.camel@kazak.uk.xensource.com>
	<524D7287.7040107@m2r.biz>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <524D7287.7040107@m2r.biz>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: George.Dunlap@eu.citrix.com, xen-devel@lists.xensource.com, Ian.Jackson@eu.citrix.com, Stefano.Stabellini@eu.citrix.com
List-Id: xen-devel@lists.xenproject.org

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@m2r.biz>
>>> ---
>>>   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
>>
>