Il 14/11/2012 10:55, Wenchao Xia ha scritto: >> In order to resolve OOM issue, I am trying wrap all APIs using >> sunrpc, need some suggestion before coding. > > Is the client/server approach really necessary or can you write a > library that invokes qemu-nbd/qemu-img? > > If there is a startup cost problem with qemu-img it may be possible to > add an interactive mode (like qemu-io) where qemu-img stays open and > responds to commands (maybe in JSON encoding). > > The difference between this and the RPC approach is that you can write a > relatively thin NBD and qemu-img library with the tools that already > exist today.
In fact, I think this is not our issue. If libvirt wants to use libqblock but have a problem with OOM exit, they can write their own wrappers to do the simple tasks they need, or just keep on using qemu-img with JSON output (possibly extending it and keeping the functionality upstream). For many of those tasks, it may turn out that qemu-img extensions would be useful anyway. Paolo
