On Thu, Jul 17, 2008 at 10:22:05AM -0400, Cole Robinson wrote: > Daniel P. Berrange wrote: > > On Thu, Jul 17, 2008 at 01:29:45AM +0200, Stefan de Konink wrote: > >> If this gets implemented I would suggest a call that fetches all domains > >> from a running system and not only the defined or only the active ones. > > > > This is a good idea regardless. The current APIs require an application > > todo > > > > num = list number of domains > > for 1 to num > > lookup domain by id > > > > In the case of the Xen drivers, this requires O(n) calls to XenD which > > are rather expensive. XenD does actually have ability to return data about > > all domains in a single request. So if we had an API for fetching all > > domains at once it'd only require O(1) expensive XenD calls. I'd imagine > > something like this > > > > > > int virConnectListAllDomains(virConnectPtr conn, > > virDomainPtr **domains, > > int stateflags); > > I've thought about something similar as well. It would also be useful to > have a command like ListUUIDs with similar state flags, giving apps a > more light weight manner of polling for domain state changes (ex. > virt-manager) A plain ListUUIDs wouldn't be any more efficient - we'd still have to hit either Xenstore or XenD to get the listing, and once you're doing that you may as well return the name & ID too in a virDomainPtr object Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| -- Libvir-list mailing list Libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list