Abstract: Systems and methods for the management of migrations of virtual machine instances are provided. In response to a request to migrate a virtual machine instance, a migration manager may provide estimates regarding the requested migration before initiating the migration. During the migration process, the migration manager may report status or request instructions regarding the migration based on various determined migration events, thereby facilitating external control of the migration process.

Abstract: Techniques for managing a critical phase of a virtual machine migration are described herein. During the critical phase, which must be kept as short as possible, a virtual machine instance is paused, network packets are rerouted to a temporary packet queue, and messages associated with managing synchronization of block storage devices are dispatched to an entity configured to manage those connections. After the block storage devices are synchronized, the network packets are released from the temporary packet queue to the new location of the virtual machine instance.

Abstract: Remote computing resource service providers allow customers to execute virtual computer systems in a virtual environment on hardware provided by the computing resource service provider. The hardware may be distributed between various geographic locations connected by a network. The distributed environment may increase latency of various operations of the virtual computer systems executed by the customer. To reduce latency of various operations predictive modeling is used to predict the occurrence of various operations and initiate the operations before they may occur, thereby reducing the amount of latency perceived by the customer.

Abstract: Systems and methods for the management of migrations of virtual machine instances are provided. In response to a request to migrate a virtual machine instance, a migration manager may provide estimates regarding the requested migration before initiating the migration. During the migration process, the migration manager may report status or request instructions regarding the migration based on various determined migration events, thereby facilitating external control of the migration process.

Abstract: Systems and methods for the management of migrations of virtual machine instances are provided. In response to a request to migrate a virtual machine instance, a migration manager may provide estimates regarding the requested migration before initiating the migration. During the migration process, the migration manager may report status or request instructions regarding the migration based on various determined migration events, thereby facilitating external control of the migration process.

Abstract: Remote computing resource service providers allow customers to execute virtual computer systems in a virtual environment on hardware provided by the computing resource service provider. The hardware may be distributed between various geographic locations connected by a network. The distributed environment may increase latency of various operations of the virtual computer systems executed by the customer. To reduce latency of various operations predictive modeling is used to predict the occurrence of various operations and initiate the operations before they may occur, thereby reducing the amount of latency perceived by the customer.

Abstract: A method includes, in a virtualized processing system, generating a local value of a first counter. The local value is accessible while executing in a first mode of the virtualized processing system. The local value is generated based on a value of a second counter and a ratio of a rate of the first counter to a rate of the second counter. The first counter is inaccessible while executing in the first mode of the virtualized processing system and accessible while executing in a second mode of the virtualized processing system. The first mode may be a guest mode and the second mode may be a host mode. The first counter may be an ACPI Power Management Timer. The second counter may be a Time Stamp Counter.

Abstract: A processor including a virtual memory paging mechanism. The virtual memory paging mechanism enables an operating system operating on the processor to use pages of a first size and a second size, the second size being greater than the first size. The mechanism further enables the operating system to use superpages including two or more contiguous pages of the first size. The size of a superpage is less than the second size. The processor further includes a page table having a separate entry for each of the pages included in each superpage. The operating system accesses each superpage using a single virtual address. The mechanism interprets a single entry in a translation lookaside buffer TLB as referring to a region of memory comprising a set of pages that correspond to a superpage in response to detecting a superpage enable indicator associated with the entry in the TLB is asserted.

Abstract: A method includes, in a virtualized processing system, generating a local value of a first counter. The local value is accessible while executing in a first mode of the virtualized processing system. The local value is generated based on a value of a second counter and a ratio of a rate of the first counter to a rate of the second counter. The first counter is inaccessible while executing in the first mode of the virtualized processing system and accessible while executing in a second mode of the virtualized processing system. The first mode may be a guest mode and the second mode may be a host mode. The first counter may be an ACPI Power Management Timer. The second counter may be a Time Stamp Counter.

Abstract: A processor including a virtual memory paging mechanism. The virtual memory paging mechanism enables an operating system operating on the processor to use pages of a first size and a second size, the second size being greater than the first size. The mechanism further enables the operating system to use superpages including two or more contiguous pages of the first size. The size of a superpage is less than the second size. The processor further includes a page table having a separate entry for each of the pages included in each superpage. The operating system accesses each superpage using a single virtual address. The mechanism interprets a single entry in a translation lookaside buffer TLB as referring to a region of memory comprising a set of pages that correspond to a superpage in response to detecting a superpage enable indicator associated with the entry in the TLB is asserted.