International Business Machines Corporation

Basu Vaidyanathan

Bret Ronald Olszewski

William A Maron

Mysore Sathyanaranyana Srinivas

Dean J Burdick

Vaijayanthimala K Anand

Wen-Tzer Thomas Chen, Jr

Bruce Gerard Mealey

Diane Garza Flemming

Stephen Rees

Bernard A King-Smith

Marcos A Villarreal

Steven Wayne White

Dirk Michel

Mysore Sathyanarayana Srinivas

Ram Raghavan

Juan M Casas, Jr

Saurabh Nath Sharma

Vasu Vallabhaneni

Nitin Kumar

Janani Janakiraman

Larry Bert Brenner

Morgan Jeffrey Rosas

Luke Matthew Browning

Jacob Jason Rosales

Stephen Bailey Peckham

Marc Joel Stephenson

Michael E Lyons

Donald Ray Stence

Kavana Nandikur Bhat

Praveen Kalamegham

Norman Edward Brake, Jr

Marcos A Villareal

According to one aspect of the present disclosure, a method and technique for hybrid virtual machine configuration management is disclosed. The method includes assigning to a first set of virtual resources associated with a virtual machine a first priority and assigning to a second set of virtual resources associated with the virtual machine a second priority lower than the first priority. An operating system of the virtual machine is provided with the first and second priorities assigned to the respective first and second sets of virtual resources. The operating system dispatches to process a workload the virtual resources from the first set before dispatching the virtual resources from the second set.

Hybrid virtual machine configuration management

A process for processor management includes activating a delay thread running on a processor. A determination is made whether a wait event for a first thread running on the processor is in a queue. Responsive to determining that the wait event for the first thread is in the queue, a determination is made whether a wait time associated with the wait event has expired. Responsive to determining that the wait time has not expired, a determination is made if wait time exceeds a threshold. Responsive to determining that the wait time exceeds the threshold, a timer is set and a low power mode is initiated for the processor.

Processor management via thread status

A method, program product, and system is provided for dynamic virtual processor management in a computer having a plurality of concurrent multi-threaded physical processors. An active logical partition is assigned to one of a plurality of shared processor pools, each shared processor pool having a virtual processor manager mode. A target performance metric for a workload in the active logical partition is compared to a calculated CPU utilization ratio or a calculated response time ratio. The workload in the active logical partition is dynamically moved from the assigned shared processor pool to a logical partition in another of the plurality of shared processor pools based on the target performance metric not being met in the active logical partition, and wherein the logical partition in another of the plurality of shared processor pools is configured to meet the target performance metric.

Dynamic virtual processor manager

According to one aspect of the present disclosure, a method and technique for hybrid virtual machine configuration management is disclosed. The method includes: assigning to a first set of virtual resources associated with entitled resources of a virtual machine a first priority; assigning to a second set of virtual resources associated with the virtual machine a second priority lower than the first priority, wherein the first and seconds sets when combined exceed the entitled resources for the virtual machine; mapping the first set of virtual resources to a first physical resource of a pool of shared physical resources allocatable to the first and second sets of virtual resources, wherein the first physical resource comprises a desired affinity level to a second physical resource allocated to the virtual machine; and preferentially allocating the first physical resource to the first set of virtual resources.

A method, program product, and system is provided for dynamic virtual processor management in a computer having a plurality of concurrent multi-threaded physical processors. A workload is assigned to a first virtual processor manager pool based on a virtual processor manager mode of the first virtual processor manager pool. A current utilization ratio and a response time ratio for the workload are calculated. The workload is dynamically moved to a second virtual processor manager pool based on either the current utilization ratio or the response time ratio exceeding a configurable threshold. The workload is dynamically moved between virtual processor manager pools to realize target performance metric requirements.

Various systems, processes, and products may be used to manage a processor. In particular implementations, managing a processor may include the ability to determine whether a thread is pausing for a short period of time and place a wait event for the thread in a queue based on a short thread pause occurring. Managing a processor may also include the ability to activate a delay thread that determines whether a wait time associated with the pause has expired and remove the wait event from the queue based on the wait time having expired.

A load store advisory program sets a breakpoint within a load-store sequence of a program, determines if the breakpoint will cause unexpected behavior, and generates a warning if it is determined that the breakpoint will cause unexpected behavior. The unexpected behavior may be the result of setting a breakpoint within a load-store sequence that, because of the breakpoint, will repeatedly fail.

Advisory warning and workaround indications to user when stopped between load and store conditional instructions while using source level debuggers

A system and technique for hybrid virtual machine configuration management includes a processor and executable logic to: assign to a first set of virtual resources associated with a virtual machine a first priority, the first set associated with entitled resources for the virtual machine; assign to a second set of virtual resources associated with the virtual machine a second priority lower than the first priority, wherein the first and seconds sets when combined exceed the entitled resources for the virtual machine; map the first set to a first physical resource of a pool of shared physical resources, the pool of shared physical resources allocatable to the first and second sets, wherein the first physical resource comprises a desired affinity level to a second physical resource allocated to the virtual machine; and preferentially allocate the first physical resource to the first set of virtual resources.

A method, apparatus, and computer program product for running software on an adapter. In response to a connection of a hardware interface for the adapter with a current host computer, a processor unit in the adapter determines whether a set of protocols for communicating with the current host computer to access resources is present on the adapter. In response to the set of protocols being absent on the adapter, the processor unit obtains the set of protocols from the current host computer. The processor unit identifies a set of available resources in the current host computer for use by the adapter using the set of protocols. The processor unit runs software stored on a set of storage devices in the adapter using the set of available resources identified for use by the adapter.

Application server for mainframe computer systems

Provided are techniques for providing a first lock, corresponding to a resource, in a memory that is global to a plurality of processor; spinning, by a first thread running on a first processor of the processors, at a low hardware-thread priority on the first lock such that the first processor does not yield processor cycles to a hypervisor; spinning, by a second thread running on a second processor, on a second lock in a memory local to the second processor such that the second processor is configured to yield processor cycles to the hypervisor; acquiring the lock and the corresponding resource by the first thread; and, in response to the acquiring of the lock by the first thread, spinning, by the second thread, at the low hardware-thread priority on the first lock rather than the second lock such that the second processor does not yield processor cycles to the hypervisor.

Efficient lock hand-off in a symmetric multiprocessor system

Efficient lock hand-off in a symmetric multiprocessing system

Systems and computer program products for lock tracing at a component level are disclosed. The one or more embodiments of the invention include computer program instructions for associating one or more locks with a component of the operating system; initiating lock tracing for the component; and instrumenting the component-associated locks with lock tracing program instructions in response to initiating lock tracing. The locks are selected from a group of locks configured for use by an operating system and individually comprise locking code. The component lock tracing may be static or dynamic.

Component lock tracing by associating component type parameters with particular lock instances

A cache entry replacement unit can delay replacement of more valuable entries by replacing less valuable entries. When a miss occurs, the cache entry replacement unit can determine a cache entry for replacement ('a replacement entry') based on a generic replacement technique. If the replacement entry is an entry that should be protected from replacement (e.g., a large page entry), the cache entry replacement unit can determine a second replacement entry. The cache entry replacement unit can 'skip' the first replacement entry by replacing the second replacement entry with a new entry, if the second replacement entry is an entry that should not be protected (e.g., a small page entry). The first replacement entry can be skipped a predefined number of times before the first replacement entry is replaced with a new entry.

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Austin, TX, United States of America

Basu Vaidyanathan