International Business Machines Corporation

Ronald C Pierson

Walter Church, Iv

Thomas B Mathias

William Alan Holder

An aspect of the invention includes a method for receiving a request to reclaim a portion of a memory assigned to a virtual machine (VM). In response to receiving the request, an increment of the plurality of increments to vacate is selected. The selecting is based at least in part on the failure counts corresponding to each of the plurality of increments. An attempt is made to vacate all contents of the selected increment. Based at least in part on determining that all contents of the selected increment were not vacated, a failure count corresponding to the selected increment is incremented. Based at least in part on determining that all contents of the selected increment were vacated, an assignment of the selected increment to the VM is removed.

Virtual machine memory removal increment selection

An aspect of the invention is a method that includes receiving a request from a requestor to reclaim a portion of a memory assigned to a virtual machine (VM). The memory includes real memory that is divided into a plurality of increments. An amount of paging space that will be occupied by the VM subsequent to reclaiming the portion of the memory is predicted. Based on the predicted amount of paging space exceeding a threshold, the requestor is notified that the portion of the memory cannot be reclaimed. Based on the predicted amount of paging space not exceeding the threshold, a reclamation of the portion of the memory is initiated. The reclamation includes vacating an increment of the plurality of increments and removing an assignment of the increment to the VM.

Self-determination for cancellation of in-progress memory removal from a virtual machine

Embodiments of the invention relate to visiting, by a computing device comprising a processor, each guest of a plurality of guests, obtaining, by the computing device, a list of invalidation counts and revalidation counts associated with resources based on the visiting each guest, and calculating, by the computing device, a target size for invalidating resources for each guest based on the list of invalidation counts and revalidation counts.

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Green Cove Springs, FL, United States of America

Ronald C Pierson