Re: [Xen-devel] [RFC][PATCH 12/13] Kemari: use signal to save qemu state for Kemari

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Stefano Stabellini writes ("Re: [Xen-devel] [RFC][PATCH 12/13] Kemari: use 
signal to save qemu state for Kemari"):
> Yoshiaki Tamura wrote:
> > This patch implements signal handler for saving QEMU status
> > quickly.  It also includes a feature borrowed from KVM-17, which
> > saves QEMU status quickly without repositioning file offset by
> > fseek.
> 
> We got rid of the signal interface not so long ago because it doesn't
> work for stubdoms.
> 
> The new way of asking qemu to save the VM state is writing a command on
> xenstore (look at xenstore.c:xenstore_process_dm_command_event).
> Would that work for you?

I think that in this case a signal-based interface is probably fine,
because it does indeed need very good performance which is difficult
to do with xenstore.

Ian.

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