Abstract: One or more embodiments provide techniques for migrating virtual machines (VMs) from a private data center to a cloud data center. A hybrid cloud manager determines a scope of migration from the private data center to the cloud data center. The hybrid cloud manager groups each VM included in the scope of migration into one or more clusters. The hybrid cloud manager defines one or more migration phases. Each migration phase comprises a subset of the one or more clusters. The hybrid cloud manager generates a migration schedule based on at least the one or more migration phases. The hybrid cloud manager migrates the VMs from the private data center to the cloud data center in accordance with the migration schedule.

Abstract: This disclosure is directed to tagging tokens or sequences of tokens in log messages generated by a logging source. Event types of log messages in a block of log messages are collected. A series of tagging operations are applied to each log message in the block. For each tagging operation, event types that are qualified to receive the corresponding tag are identified. When a log message is received, the event type is determined and compared with the event types of the block in order to identify a matching event type. The series of tagging operations are applied to the log message to generate a tagged log message with the restriction that each tagging operation only applies a tag to token or sequences of tokens when the event type is qualified to receive the tag. The tagged log message is stored in a data-storage device.

Abstract: A system and method are disclosed for improving operation of a memory scheduler operating on a host machine supporting virtual machines (VMs) in which guest operating systems and guest applications run. For each virtual machine, the host machine hypervisor categorizes memory pages into memory usage classes and estimates the total number of pages for each memory usage class. The memory scheduler uses this information to perform memory reclamation and allocation operations for each virtual machine. The memory scheduler further selects between ballooning reclamation and swapping reclamation operations based in part on the numbers of pages in each memory usage class for the virtual machine. Calls to the guest operating system provide the memory usage class information. Memory reclamation not only can improve the performance of existing VMs, but can also permit the addition of a VM on the host machine without substantially impacting the performance of the existing and new VMs.

Abstract: Network bandwidth is allocated to virtual machines (VMs) according to a node hierarchy that includes a root node, intermediate nodes, and leaf nodes, wherein each leaf node represents a queue of packet transmission requests from a VM and each intermediate node represents a grouping of leaf queues. As VMs generate requests to transmit packets over the network, the network bandwidth is allocated by queuing packets for transmission in the leaf nodes, and selecting a leaf node from which a packet is to be transmitted based on tracking data that represent how much network bandwidth has been allocated to the nodes. Upon selecting the leaf node, the tracking data of the selected leaf node and the tracking data of an intermediate node that is a parent node of the selected leaf node are updated, and a command to transmit the packet of the selected leaf node is issued.

Abstract: A virtualization system supports secure, controlled execution of application programs within virtual machines. The virtual machine encapsulates a virtual hardware platform and guest operating system executable with respect to the virtual hardware platform to provide a program execution space within the virtual machine. An application program, requiring license control data to enable execution of the application program, is provided within the program execution space for execution within the virtual machine. A data store providing storage of encrypted policy control information and the license control data is provided external to the virtual machine. The data store is accessed through a virtualization system including a policy controller that is selectively responsive to a request received from the virtual machine to retrieve the license control data dependent on an evaluation of the encrypted policy control information.