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    Post-copy VM migration speedup using free page hinting
    8.
    发明授权
    Post-copy VM migration speedup using free page hinting 有权

    公开(公告)号：US09934157B2

    公开(公告)日：2018-04-03

    申请号：US14952833

    申请日：2015-11-25

    Applicant: Red Hart Israel, LTD

    Inventor： Michael Tsirkin ,  David A. Gilbert

    IPC: G06F12/10 ,  G06F12/1009

    CPC classification number: G06F12/1009 ,  G06F12/109 ,  G06F2212/1024 ,  G06F2212/151 ,  G06F2212/254 ,  G06F2212/261

    Abstract: A system and methods for migrating a virtual machine (VM). In one embodiment, a hypervisor receives a request to migrate the contents of a memory of a source VM in a first physical memory area to a destination VM in a second physical memory area, where the first and second physical memory areas are disjoint. The hypervisor executes the destination VM in response to the request, and detects an access of a page of memory of the destination VM. The hypervisor determines, in view of a data structure maintained by a guest operating system executing in the destination VM, that a first page of a memory of the source VM in the first physical memory area is currently in use by the destination VM. In response to the detecting, the hypervisor: copies, in view of the first page of VM memory being used by the destination VM, the contents of the first page to a corresponding page of the destination VM; and maps, in view of a second page of VM memory not being used by the destination VM, (i) a physical memory page that is external to the first physical memory area and to the second physical memory area to (ii) a page of the destination VM corresponding to the second page.

    Reducing concurrency of garbage collection operations
    10.
    发明授权
    Reducing concurrency of garbage collection operations 有权

    公开(公告)号：US09880745B2

    公开(公告)日：2018-01-30

    申请号：US15187994

    申请日：2016-06-21

    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

    Inventor： Nikolas Ioannou ,  Ioannis Koltsidas ,  Amit Margalit ,  Rivka M. Matosevich

    IPC: G06F12/00 ,  G06F3/06 ,  G06F12/02

    CPC classification number: G06F3/061 ,  G06F3/0652 ,  G06F3/067 ,  G06F2212/1016 ,  G06F2212/1048 ,  G06F2212/261 ,  G06F2212/263 ,  G06F2212/7205

    Abstract: Methods, computing systems and computer program products implement embodiments of the present invention that include identifying, in a storage system including multiple storage devices having respective sets of storage regions, respective default low storage region thresholds that are used for garbage collection. For each given storage region, a time threshold and an alternative low storage region threshold greater than the default low storage region threshold for the given storage device are defined. While processing input/output operations for each given storage device, a count of unused storage regions in the given storage device is maintained, a timer is initialized, and upon the timer matching the time threshold for the given storage device and upon the count of unused storage regions being less than or equal to the alternative low storage region threshold, a garbage collection operation is initiated. In some embodiments, processing the input/output operations includes using a log-structured array format.

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