pub trait MemControllerProxyInterface: Send + Sync {
type GetMemSizeResponseFut: Future<Output = Result<(u64, u64, u64, u64, u64), Error>> + Send;
// Required methods
fn get_mem_size(&self) -> Self::GetMemSizeResponseFut;
fn request_size(&self, requested_size: u64) -> Result<(), Error>;
}