Re: [Xen-devel] per-domain logging

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Sep 19, 2016 at 04:23:06PM +0100, Ian Jackson wrote:
> Cedric Bosdonnat writes ("Re: [Xen-devel] per-domain logging"):
> > On Thu, 2016-09-15 at 16:11 +0100, Wei Liu wrote:
> > > IIRC there is already logfile abstraction inside libvirt -- can you just
> > > pass in a libvirt logfile fd and try to demux there?
> > 
> > The abstraction we have is something similar to the XenToolLogger,
> > not something abstracting the log files. Even if we had that, how
> > could we demux since there is no domain name in the libxl messages.
> 
> Right.
> 
> It's not trivial to change the xtl API because there is no
> negotiation, just a vops structure.  I can think of a way to do it,
> but do we want to make all xtl logger users (that is, all generators
> of log messages) pass a domid ?
> 
> Do we want to extend this to other information ?  (Not sure _what_
> other information.)

It would very much be useful for migration. So that you can
have mulitple logs.
> 
> Alternatively, we could have libxl (and perhaps libxc) put the domid
> in a standard format in the message, so it could be extracted ?
> 
> However we do it, we would have to add a domid to every LOG call in
> libxl.

Ugh. I am leaning towards the xtl API change (whatever that may be).
> 
> Ian.
> 
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