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    IDENTIFICATION OF LOW-ACTIVITY LARGE MEMORY PAGES
    3.
    发明申请
    IDENTIFICATION OF LOW-ACTIVITY LARGE MEMORY PAGES 有权
    识别低活性大记忆页

    公开(公告)号：US20150363325A1

    公开(公告)日：2015-12-17

    申请号：US14302051

    申请日：2014-06-11

    Applicant: VMware, Inc.

    Inventor： Yury BASKAKOV ,  Peng GAO ,  Joyce Kay SPENCER

    IPC: G06F12/10 ,  G06F9/50 ,  G06F9/455 ,  G06F12/12

    CPC classification number: G06F12/1009 ,  G06F9/45558 ,  G06F9/5077 ,  G06F12/0253 ,  G06F12/1027 ,  G06F12/12 ,  G06F2009/45583 ,  G06F2212/1024 ,  G06F2212/651 ,  G06F2212/652 ,  G06F2212/657

    Abstract: Large pages that may impede memory performance in computer systems are identified. In operation, mappings to selected large pages are temporarily demoted to mappings to small pages and accesses to these small pages are then tracked. For each selected large page, an activity level is determined based on the tracked accesses to the small pages included in the large page. By strategically selecting relatively low activity large pages for decomposition into small pages and subsequent memory reclamation while restoring the mappings to relatively high activity large pages, memory consumption is improved, while limiting performance impact attributable to using small pages.

    Abstract translation: 确定可能阻碍计算机系统中的记忆性能的大页面。 在操作中，与所选大页面的映射临时降级到小页面的映射，然后跟踪对这些小页面的访问。 对于每个选定的大页面，基于对包含在大页面中的小页面的跟踪访问来确定活动级别。 通过战略性地选择相对较低的活动大页面来分解成小页面和随后的存储器回收，同时将映射恢复到相对较高的活动大页面，提高了内存消耗，同时限制了使用小页面的性能影响。

    METHOD FOR SAVING VIRTUAL MACHINE STATE TO A CHECKPOINT FILE
    4.
    发明申请
    METHOD FOR SAVING VIRTUAL MACHINE STATE TO A CHECKPOINT FILE 有权
    将虚拟机状态保存到检查点文件的方法

    公开(公告)号：US20140164722A1

    公开(公告)日：2014-06-12

    申请号：US13710185

    申请日：2012-12-10

    Applicant: VMWARE, INC.

    Inventor： Alexander Thomas GARTHWAITE ,  Yury BASKAKOV ,  Irene ZHANG ,  Kevin Scott CHRISTOPHER ,  Jesse POOL

    IPC: G06F12/16

    CPC classification number: G06F12/16 ,  G06F11/00

    Abstract: A process for lazy checkpointing a virtual machine is enhanced to reduce the number of read/write accesses to the checkpoint file and thereby speed up the checkpointing process. The process for saving a state of a virtual machine running in a physical machine to a checkpoint file maintained in persistent storage includes the steps of copying contents of a block of memory pages, which may be compressed, into a staging buffer, determining after the copying if the buffer is full, and upon determining that the buffer is full, saving the buffer contents in a storage block of the checkpoint file.

    Abstract translation: 增强了对虚拟机进行懒惰检查点的过程，以减少对检查点文件的读/写访问次数，从而加快了检查点处理过程。 将在物理机器中运行的虚拟机的状态保存到持久存储器中维护的检查点文件的过程包括以下步骤：将可压缩的存储器页块的内容复制到暂存缓冲器中，在复制之后确定 如果缓冲区已满，并且在确定缓冲区已满时，将缓冲区内容保存在检查点文件的存储块中。

    METHOD FOR RESTORING VIRTUAL MACHINE STATE FROM A CHECKPOINT FILE
    10.
    发明申请
    METHOD FOR RESTORING VIRTUAL MACHINE STATE FROM A CHECKPOINT FILE 有权
    从检查点文件恢复虚拟机状态的方法

    公开(公告)号：US20140164723A1

    公开(公告)日：2014-06-12

    申请号：US13710215

    申请日：2012-12-10

    Applicant: VMWARE, INC.

    Inventor： Alexander Thomas GARTHWAITE ,  Yury BASKAKOV ,  Irene ZHANG ,  Kevin Scott CHRISTOPHER ,  Jesse POOL

    IPC: G06F12/16

    CPC classification number: G06F12/16 ,  G06F9/45558 ,  G06F9/461 ,  G06F2009/45575 ,  G06F2009/45583

    Abstract: A process for lazy checkpointing is enhanced to reduce the number of read/write accesses to the checkpoint file and thereby speed up the checkpointing process. The process for restoring a state of a virtual machine (VM) running in a physical machine from a checkpoint file that is maintained in persistent storage includes the steps of detecting access to a memory page of the virtual machine that has not been read into physical memory of the VM from the checkpoint file, determining a storage block of the checkpoint file to which the accessed memory page maps, writing contents of the storage block in a buffer, and copying contents of a block of memory pages that includes the accessed memory page from the buffer to corresponding locations of the memory pages in the physical memory of the VM. The storage block of the checkpoint file may be compressed or uncompressed.

    Abstract translation: 增强了用于延迟检查点的过程，以减少对检查点文件的读/写访问次数，从而加快了检查点处理过程。 从维护在持久存储器中的检查点文件恢复在物理机器中运行的虚拟机（VM）的状态的过程包括以下步骤：检测对尚未被读入物理存储器的虚拟机的存储器页面的访问 从所述检查点文件确定所述VM的存储块，确定所访问的存储器页映射到的所述检查点文件的存储块，将所述存储块的内容写入缓冲器，以及将包括所访问的存储器页的存储器页块的内容从 缓冲区到VM的物理内存中的内存页的相应位置。 检查点文件的存储块可以被压缩或未压缩。

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