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Re: [Xen-devel] [PATCH] Fix xm save timeout with paused domains

To: Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] Fix xm save timeout with paused domains
From: John Levon <levon@xxxxxxxxxxxxxxxxx>
Date: Tue, 8 May 2007 17:37:45 +0100
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On Tue, May 08, 2007 at 05:26:50PM +0100, Keir Fraser wrote:

> >> How about just not pausing a domain that you're going to save?
> > 
> > This doesn't work when you're doing tight save/restore / migration
> > loops, where the unpausing happens after plugging virtual devices for
> > the new domain. This can cause the timer to expire before we unpause the
> > domain and give it a chance to update its frame list entry.
> Hmm.. Perhaps 'xm restore/migrate' shouldn't return until the new domain is
> actually running.

This wouldn't protect against requests via the Xen API.

> Or (probably easier) xend should hold save requests pending until the
> domain concerned is unpaused?

If you'd prefer it there, that's probably possible too.


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