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xen-devel
Re: [Xen-devel] [RFC][PATCH 12/13] Kemari: use signal to save qemu state
Stefano Stabellini wrote:
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?
xenstore is attractive because it can send more information between components
than signals.
However, we used the signal handler to avoid the latency of xenstore. Although
we haven't measured the latency, we need a simple and quick interface to save
the QEMU state because Kemari transfers the saved state on every synchronization
which happens quite often.
Have you measured, or any thoughts on the latency of xenstore compared to
signals?
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