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Re: [Xen-devel] [PATCH 0 of 3] Remus: control tool

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 0 of 3] Remus: control tool
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 02 Dec 2009 10:34:06 -0800
Cc: "andy@xxxxxxxxx" <andy@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "konrad.wilk@xxxxxxxxxx" <konrad.wilk@xxxxxxxxxx>
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On 12/02/09 10:25, Keir Fraser wrote:
> From the tools p.o.v. the restore has finished when it kicks off execution
> of the guest. It's not that hard to handle this in the guest; you just need
> to do it. ;-)

Well, I think that just happens at the moment; the suspend is happening
from the xenstore watch thread, so there's no way it will even notice a
subsequent attempt until the suspend/resume cycle is done.

When we start triggering suspends from event channels, I'd suggest
something along the lines of wrapping the whole thing in a big fat
suspend mutex, and running the suspend from a workqueue triggered from
the interrupt or watch handler.  And then deal with all the edge cases.


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