International Business Machines Corporation

Mitchell P Harding

Michael C Hollinger

Michael R Reddock

Chang W Chen

Kevin J Cawlfield

Matthew John Harding

Joshua Delcambre Miers

Responsive to a hypervisor determining that insufficient local resources are available for reservation to meet a performance parameter for at least one resource specified in a reservation request for a particular logical partition managed by the hypervisor in a host system, the hypervisor identifies another logical partition managed by the hypervisor in the host system that is assigned at the least one resource meeting the performance parameter specified in the reservation request. The hypervisor estimates a first cost of migrating the particular logical partition and a second cost of migrating the another logical partition to at least one other host system communicatively connected in a peer-to-peer network based on at least one previously recorded cost stored by the host system of migrating a previous logical partition to the at least one other host system.

Estimating migration costs for migrating logical partitions within a virtualized computing environment based on a migration cost history

A hypervisor negotiates to reserve at least one available local resource in a host system that meets a performance parameter for at least one resource specified in a reservation request by a particular logical partition from among one or more logical partitions of virtualized pools of resources managed by the hypervisor in the host system, wherein the at least one performance parameter is specified by a particular application initiating the reservation request. The hypervisor, responsive to determining that the at least one available resource is not available in the host system, negotiates for offers to migrate the particular logical partition to at least one other host system comprising at least one available remote resource that meets the performance parameter, wherein the at least one other host system is managed by at least one other hypervisor that manages one or more other logical partitions of virtualized pools of resources.

Application initiated negotiations for resources meeting a performance parameter in a virtualized computing environment

A code coverage tool tests a program under test that executes on a processor of an information handling system (IHS). The code coverage tool may apportion the program under test into code portions of interest that exhibit a user-specified granularity level. A user may request that the code coverage tool change the granularity level of the code portions of interest in real time. The code coverage tool conducts testing of the code portions of interest according to test criteria that the user may specify in real time. The code coverage tool may provide test results for each of the code portions of interest in real time. The code coverage tool may also provide a summary report after providing real time results for the code portions of interest. The user may specify that the code coverage tool generate real time test results in the form of sensory output, for example auditory output or visual output, for each of the code portions of interest. The code coverage tool may alter the type of sensory output in real time at the request of the user.

Code coverage tool

A method, computer program product, and data processing system for managing a input/output buffer cache for prevention of deadlocks are disclosed. In a preferred embodiment, automatic buffer cache resizing is performed whenever the number of free buffers in the buffer cache diminishes to below a pre-defined threshold. This resizing adds a pre-defined number of additional buffers to the buffer cache, up to a pre-defined absolute maximum buffer cache size. To prevent deadlocks, an absolute minimum number of free buffers are reserved to ensure that sufficient free buffers for performing a buffer cache resize are always available. In the event that the buffer cache becomes congested and cannot be resized further, threads whose buffer demands cannot be immediately satisfied are blocked until sufficient free buffers become available.

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Austin, TX, United States of America

Mitchell P Harding