International Business Machines Corporation

David Anthony Larson

Stuart Zachary Jacobs

Naresh Nayar

Kenneth Charles Vossen

Wade Byron Ouren

Kyle Alan Lucke

Edward Curtis Prosser

William Joseph Armstrong

Andrew T Koch

Michael James Vance

Peter Joseph Heyrman

Gary Ross Ricard

Richard Loise Arndt

Bryan Mark Logan

Michael Joseph Corrigan

Carol B Hernandez

John Thomas O'Quin, Ii

Christopher Harry Austen

James Arthur Lindeman

Gary Lee Ruzek

Timothy James Crawford

Jonathan Ross Van Niewaal

Michael R Groseclose, Jr

Systems, methods, and computer program products to perform an operation comprising processing a first logical partition on a shared processor for the duration of a dispatch cycle, issuing, by a hypervisor, at a predefined time prior to completion of the dispatch cycle, a lightweight hypervisor decrementer (HDEC) interrupt, and responsive to the lightweight HDEC interrupt, initiating an asynchronous hardware operation on the shared processor prior to completion of the dispatch cycle.

Using a decrementer interrupt to start long-running hardware operations before the end of a shared processor dispatch cycle

In an embodiment, a request is received for a first partition to execute on a first virtual processor. If the first physical processor is available at a first node, the first virtual processor is dispatched to execute at the first physical processor at the first node that is the home node of the first virtual processor. If the first physical processor is not available, a determination is made whether the first physical processor is assigned to a second virtual processor and a home node of the second virtual processor is not the first node. If the first physical processor is assigned to a second virtual processor and the home node of the second virtual processor is not the first node, execution of the second virtual processor is stopped on the first physical processor and the first virtual processor is dispatched to the first physical processor.

Affinity of virtual processor dispatching

The present disclosure includes a method for transferring checkpoint information of a primary virtual machine from a primary host to a secondary host that includes, by the primary host, capturing checkpoint information from the primary virtual machine to a primary holding buffer on the primary host, generating a first number of partition state records from the checkpoint information, transmitting the first number of partition state records to the secondary host, receiving acknowledgements from the secondary host for a second number of partition state records, and tracking the second number of partition state records acknowledged by the secondary host.

Checkpoint capture and tracking in a high availability system

A method for treatment of a hypervisor call sequence, in a system having a plurality of hosts, includes assigning a host ID to a plurality of hosts in the system; identifying a first host ID for a host from which a first hypervisor call of a hypervisor call sequence originates; identifying a second host ID for a host from which a second hypervisor call of the hypervisor call sequence originates, wherein the second hypervisor call is a call subsequent to the first hypervisor call; and determining whether the second host ID is equal to the first host ID.

Failover detection and treatment in checkpoint systems

Systems, methods, and computer program products to perform an operation, the operation comprising processing a first logical partition on a shared processor for the duration of a dispatch cycle, issuing, by a hypervisor, at a predefined time prior to completion of the dispatch cycle, a lightweight hypervisor decrementer (HDEC) interrupt specifying a cache line address buffer location in a virtual processor, and responsive to the lightweight HDEC, writing, by the shared processor, a set of cache line addresses used by the first logical partition to the cache line address buffer location in the virtual processor.

Performing a checkpoint includes determining a checkpoint boundary of the checkpoint for a virtual machine, wherein the virtual machine has a first virtual processor, determining a scheduled hypervisor interrupt for the first virtual processor, and adjusting, by operation of one or more computer processors, the scheduled hypervisor interrupt to before or substantially at the checkpoint boundary.

Reducing virtual machine suspension time in checkpoint system

A method, system, and computer readable medium to share data on a global basis within a symmetric multiprocessor (SMP) computer system are disclosed. The method may include grouping a plurality of processor cores into a plurality of affinity groups. The method may include creating hints about the global data in the plurality of group data structures. Each group data structure may correspond to an affinity group. The method may read a first group data structure by a thread executing on a processor core associated with a first affinity group.

Affinity group access to global data

Method to perform an operation, the operation comprising processing a first logical partition on a shared processor for the duration of a dispatch cycle, issuing, by a hypervisor, at a predefined time prior to completion of the dispatch cycle, a lightweight hypervisor decrementer (HDEC) interrupt specifying a cache line address buffer location in a virtual processor, and responsive to the lightweight HDEC, writing, by the shared processor, a set of cache line addresses used by the first logical partition to the cache line address buffer location in the virtual processor.

A method, system, and computer readable medium to share data on a global basis within a symmetric multiprocessor (SMP) computer system are disclosed. The method may include grouping a plurality of processor cores into a plurality of affinity groups. Global data may be copied into a plurality of group data structures. Each group data structure may correspond to an affinity group. The method may read a first group data structure by a thread executing on a processor core associated with a first affinity group.

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Rochester, MN, United States of America

David Anthony Larson