On 05/24/2017 07:13 AM, Markus Armbruster wrote: >>> Might lead to more traffic rather than less. Depends on what >>> information the client needs to query. >> >> I think queries that return all available QOM types are likely to >> (should?) be cached by clients. > > Perhaps libvirt developers can help us here.
Libvirt is very likely going to cache things (libvirt already tries to cache as much information as it needs from a single run of a qemu binary, and only recomputes the cache when either libvirt or qemu binaries are detected to have changed to a newer timestamp). Reading the entire list, and then libvirt computing transitive closure on that list if needed, is probably acceptable, compared to qemu having to compute transitive closure up front for a larger QMP message. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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