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- Container only is responsable of namespaces and cgroups inside the VM. - Sandbox will manage VM resources. The resouces has to be re-calculated and updated: - Create new Container: If a new container is created the cpus and memory may be updated. - Container update: The update call will change the cgroups of a container. the sandbox would need to resize the cpus and VM depending the update. To manage the resources from sandbox the hypervisor interaface adds two methods. - resizeMemory(). This function will be used by the sandbox to request increase or decrease the VM memory. - resizeCPUs() vcpus are requested to the hypervisor based on the sum of all the containers in the sandbox. The CPUs calculations use the container cgroup information all the time. This should allow do better calculations. For example. 2 containers in a pod. container 1 cpus = .5 container 2 cpus = .5 Now: Sandbox requested vcpus 1 Before: Sandbox requested vcpus 2 When a update request is done only some atributes have information. If cpu and quota are nil or 0 we dont update them. If we would updated them the sandbox calculations would remove already removed vcpus. This commit also moves the sandbox resource update call at container.update() just before the container cgroups information is updated. Fixes: #833 Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>