Open Stack

Hi,
At the moment the resource tracker in Nova ignores that statistics that are returned by the hypervisor and it calculates the values on its own. Not only is this highly error prone but it is also very costly - all of the resources on the host are read from the database. Not only the fact that we are doing something very costly is troubling, the fact that we are over calculating resources used by the hypervisor is also an issue. In my opinion this leads us to not fully utilize hosts at our disposal. I have a number of concerns with this approach and would like to know why we are not using the actual resource reported by the hypervisor.
The reason for asking this is that I have added a patch which uses the actual hypervisor resources returned and it lead to a discussion on the particular review (https://review.openstack.org/126237).
Thanks
Gary
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