From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Daniel P. Berrange" <berrange@redhat.com>
Subject: Re: Trivial patch to fix logging level output by
	XendCheckpoint.py
Date: Mon, 20 Nov 2006 22:43:23 +0000
Message-ID: <20061120224323.GF15703@redhat.com>
References: <342BAC0A5467384983B586A6B0B3767104190365@EXNA.corp.stratus.com>
	<20061120215600.GE15703@redhat.com> <45622D6E.9020607@us.ibm.com>
Reply-To: "Daniel P. Berrange" <berrange@redhat.com>
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To: Anthony Liguori <aliguori@us.ibm.com>
Cc: xen-devel <xen-devel@lists.xensource.com>, Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
List-Id: xen-devel@lists.xenproject.org

On Mon, Nov 20, 2006 at 04:34:22PM -0600, Anthony Liguori wrote:
> Daniel P. Berrange wrote:
> >On Mon, Nov 20, 2006 at 04:34:25PM -0500, Graham, Simon wrote:
> >>Signed-off by: Simon Graham <Simon.Graham@stratus.com>
> 
> >And even more importantly, once we get the error reporting patches 
> >integrated
> >into libxc, having the xc_linux_save/restore calls made by XenD directly
> >would ensure we get reliable error handling for save/restore operations.
> 
> It used to work that way.  xc_linux_save/restore were factored out of 
> Xend late in the 3.0 dev process.  I believe the idea was that they 
> should be executed with lower privileges (which is why they take file 
> descriptors as command line arguments instead of just calling 
> xc_interface_open() like you would expect).
>
> I believe it was Christian who was driving this.  Perhaps he has a few 
> more details?

Ok, looking back at the HG logs it appears  # 5099 

 "Execute xc_linux_restore in a seperate process so that it can't
  crash xend.  Also handle errors passed from xc_linux_restore and
  log info messages from xc_linux_restore."

and # 5121:

 "Implement the parts of vm save which need interaction with xend
  as part of xend, instead of using xfrd.
  Execute xc_linux_save in a seperate process so that it can't
  crash xend. Also handle errors passed from xc_linux_save.

are where these programs came into existance.

Regards,
Dan.
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