Re: [Xen-devel] Question about xm save

[Ewan Mellor <ewan@xxxxxxxxxxxxx>]

On Mon, Mar 12, 2007 at 08:53:40AM +0100, Dietmar Hahn wrote:

> Hi,
> 
> I'm trying to understand what's going on while calling 'xm save ...'.
> I looked through the sources and found in xend stuff:
> XendCheckpoint.py -> saveInputHandler() -> dominfo.shutdown('suspend')
> This makes an entry in the xenstore:
> control = ""
>     shutdown = "suspend"
> The function dominfo.waitForShutdown() is startet and waits for an event.
> In parallel (with the forkHelper) the command
> '/usr/lib/xen/bin/xc_save 21 1 0 0 0' is started and never returns.
> What I miss is the connection between these both things.
> Can anybody give me a hint?
> (For the tests I simply added some tracer in the python scripts and startet 
> the mini-os.)
> Many thanks in advance!

Xend is waiting for the guest to suspend, at which point it will write back to
xc_save, and then the save will complete.  Your guest is not suspending, by
the looks of it.

Ewan.

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