Keep the ComputeNode model updated with usage

Keep the compute host's ComputeNode model in sync with the
level of resource usage.  This enables the ComputeNode
model to be used as a basis for scheduling decisions
rather than forcing scheduler to calculate free
resources from an instance_get_all on each request.

Resources like memory and disk are claimed as instances are built
or deleted.  There is also support for configurable compute node
stats (a generic key/value store) for extensible advertising of other
usage stats that may be useful for a particular scheduler
implementation.  Additionally, there is a periodic task on the
compute host that audits actual resource consumption at the virt
layer to ensure that the database stays in sync.

This change partially implements blueprint: scheduler-resource-race

This patch complements:
https://review.openstack.org/#/c/9540/  (build re-scheduling support)

Change-Id: Ibbe3839a054f8b80664b413d47f766ca8d68e3f2

0 files changed, 0 insertions, 0 deletions