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Re: [libvirt] [PATCH] qemu: Allow graceful domain destroy



On Mon, Aug 22, 2011 at 09:29:56AM -0600, Eric Blake wrote:
> On 08/22/2011 09:21 AM, Daniel P. Berrange wrote:
> >If we had a separate API for sending 'quit' on the monitor, then the
> >mgmt app can decide how long to wait for the graceful shutdown of QEMU
> >before resorting to the hard virDomainDestroy command. If the app knows
> >that there is high I/O load, then it might want to wait for 'quit' to
> >complete longer than normal to allow enough time for I/O flush.
> 
> Indeed - that is exactly what I was envisioning with a
> virDomainShutdownFlags() call with a flag to request to use the quit
> monitor command instead of the default ACPI injection.  The
> virDomainShutdownFlags() would have no timeout (it blocks until
> successful, or returns failure with no 'quit' command attempted),
> and the caller can inject their own unconditional virDomainDestroy()
> at whatever timeout they think is appropriate.

The virDomainShutdown API is really about guest initiated graceful
shutdown. Sending the 'quit' command to QEMU is still *ungraceful*
as far as the guest OS is concerned, so I think it is best not to
leverage the Shutdown API for 'quit'.

I think this probably calls for a virDomainQuit API.


Daniel
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