Amazon patents cloud system that adjusts server speed without restarting apps

1. A computer-implemented method comprising: executing, by a host system of a cloud provider network, a compute instance having an associated virtual processor, wherein the host system provides the compute instance with a baseline compute performance of a first percentage of the associated virtual processor, and wherein the host system includes a scheduler to allocate compute time between at least the compute instance and another compute instance executing on the host system; receiving a request to change the baseline compute performance of the compute instance, wherein the request includes an indication of a new baseline compute performance of a second percentage of the associated virtual processor; determining, by a baseline management service implemented as baseline management service code executing on one or more processors in the cloud provider network, to grant the request, wherein determining to grant the request comprises: determining an available baseline capacity of the host system; determining that a difference between the baseline compute performance and the new baseline compute performance exceeds the available baseline capacity of the host system; based on determining the difference between the baseline compute performance and the new baseline compute performance exceeds the available baseline capacity of the host system, obtaining an estimated time to live migrate another compute instance executing on the host system to another host system; determining the estimated time is below a threshold specified in a live migration policy requirement; based on determining the estimated time is below the threshold specified in the live migration policy requirement, initiating a live migration of the another compute instance executing on the host system to the another host system; and based on determining the estimated time is below the threshold specified in the live migration policy requirement, determining to grant the request to change the baseline compute performance of the compute instance; and updating a parameter of the scheduler to change the baseline compute performance of the compute instance to the new baseline compute performance while the compute instance remains in an executing state.