[libvirt] Adding timestamps for all emulator output

[Daniel P. Berrange]

On Thu, Feb 26, 2015 at 06:29:49PM +0400, Andrey Korolyov wrote:
> Hello,
> 
> I think it would be useful if libvirt will be able to prefix all
> messages from emulator pipes with the date stamping, for example I am
> trying to catch very rare and non-fatal race with
> 
> virtio-serial-bus: Guest failure in adding device virtio-serial0.0
> 
> which is specific to the Windows guests on qemu-kvm. I have supporting
> infrastructure which can tell me exact times for every action upon
> this VM, but as bug is not frequent, the continuous monitoring looks
> like an overkill for a desired goal - find a correlation between
> emulator event and message from stderr. Patching emulator itself is
> barely an option, as it is ugly, requires refresh of the running code
> via loopback migration and completely non-universal, as every
> hypervisor should be modified seperately.
> 
> I`d highly appreciate positive consideration for such functionality
> addition or can write a patch shortly, if needed. Thanks!

Just set 'log_timestamp' in /etc/libvirt/qemu.conf and QEMU will then
include a timestamp in any messages it writes to the stderr log file.

Regards,
Daniel
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