公开(公告)号：US09032398B2

公开(公告)日：2015-05-12

申请号：US12834662

申请日：2010-07-12

申请人： Irfan Ahmad ,  Carl A. Waldspurger ,  Alexander Thomas Garthwaite ,  Kiran Tati ,  Pin Lu

发明人： Irfan Ahmad ,  Carl A. Waldspurger ,  Alexander Thomas Garthwaite ,  Kiran Tati ,  Pin Lu

IPC分类号： G06F21/00 ,  G06F12/00 ,  G06F12/08 ,  G06F12/10

CPC分类号： G06F12/08 ,  G06F12/10

摘要： Activity level of memory pages is classified in virtual machine environment, so that processes such as live VM migration and checkpointing, among others, can be carried out more efficiently. The method includes the steps of scanning page table entries of hypervisor-managed page tables continuously over repeating scan periods to determine whether memory pages have been accessed or not, and for each memory page, determining an activity level of the memory page based on whether the memory page has been accessed or not since a prior scan and storing the activity level of the memory page. The activity level of the memory page may be represented by one or more bits of its page table entry and may be classified as having at least two states ranging from hot to cold.

摘要翻译： 内存页面的活动级别分为虚拟机环境，可以更有效地执行诸如虚拟机迁移和检查点之类的进程。 该方法包括以下步骤：在重复的扫描周期上连续地扫描虚拟机管理程序管理的页表的页表条目，以确定是否已存取存储器页;以及对于每个存储器页，基于是否存储页，确定存储器页的活动级别 存储器页面已被访问或不被访问，因为先前扫描并存储存储器页面的活动级别。 存储器页面的活动级别可以由其页表项的一个或多个位表示，并且可以被分类为具有从热到冷的至少两个状态。

公开(公告)号：US08832390B1

公开(公告)日：2014-09-09

申请号：US12834669

申请日：2010-07-12

申请人： Irfan Ahmad ,  Kiran Tati ,  Pin Lu

发明人： Irfan Ahmad ,  Kiran Tati ,  Pin Lu

IPC分类号： G06F12/00 ,  G06F9/455

CPC分类号： G06F9/5016 ,  G06F9/4856 ,  G06F2209/485

摘要： Activity level of memory pages is repeatedly classified in a virtual machine environment, so that live VM migration can be carried out more efficiently. The time intervals upon which the activity level of the memory pages are repeatedly classified can be dynamically adjusted to better align its performance with the live VM migration process.

摘要翻译： 内存页面的活动级别在虚拟机环境中重复分类，从而可以更有效地执行虚拟机迁移。 可以动态调整内存页面的活动级别重复分类的时间间隔，以便更好地将其性能与实时VM迁移过程保持一致。

公开(公告)号：US09063866B1

公开(公告)日：2015-06-23

申请号：US12834677

申请日：2010-07-12

申请人： Kiran Tati ,  Irfan Ahmad

发明人： Kiran Tati ,  Irfan Ahmad

IPC分类号： G06F12/00 ,  G06F9/455 ,  G06F12/10 ,  G06F12/08

CPC分类号： G06F12/10 ,  G06F12/08 ,  G06F12/1009 ,  G06F12/124 ,  G06F2212/151 ,  Y02D10/13

摘要： Activity level of memory pages is classified in virtual machine environment, so that processes such as live VM migration and checkpointing, among others, can be carried out more efficiently. The method includes the steps of scanning page table entries of hypervisor-managed page tables continuously over repeating scan periods to determine whether memory pages have been accessed or not, and for each memory page, determining an activity level of the memory page based on whether the memory page has been accessed or not since a prior scan and storing the activity level of the memory page. The activity level of the memory page may be represented by one or more bits of its page table entry and may be classified as having at least two states ranging from hot to cold.

摘要翻译： 内存页面的活动级别分为虚拟机环境，可以更有效地执行诸如虚拟机迁移和检查点之类的进程。 该方法包括以下步骤：在重复的扫描周期上连续地扫描虚拟机管理程序管理的页表的页表条目，以确定是否已存取存储器页;以及对于每个存储器页，基于是否存储页，确定存储器页的活动级别 存储器页面已被访问或不被访问，因为先前扫描并存储存储器页面的活动级别。 存储器页面的活动级别可以由其页表项的一个或多个位表示，并且可以被分类为具有从热到冷的至少两个状态。

公开(公告)号：US09086981B1

公开(公告)日：2015-07-21

申请号：US12938107

申请日：2010-11-02

申请人： Kiran Tati ,  Gabriel Tarasuk-Levin ,  KaWing Ho ,  Jesse Pool

发明人： Kiran Tati ,  Gabriel Tarasuk-Levin ,  KaWing Ho ,  Jesse Pool

IPC分类号： G06F12/00 ,  G06F12/10 ,  G06F9/455

CPC分类号： G06F12/0882 ,  G06F9/45558 ,  G06F12/08 ,  G06F12/10 ,  G06F2009/4557 ,  G06F2009/45583 ,  G06F2212/1008 ,  G06F2212/151 ,  G06F2212/654 ,  G06F2212/657

摘要： When a request is made to retrieve a guest physical page from memory and a page fault occurs, a guest virtual page address that corresponds to the guest physical page is identified along with addresses for guest virtual pages that are near the guest virtual page in the virtual address space. Each identified guest virtual page address is translated into a corresponding guest physical page address and the corresponding guest physical pages are loaded into memory.

摘要翻译： 当请求从存储器检索访客物理页面并发生页面错误时，与访客物理页面相对应的访客虚拟页面地址与虚拟的客体虚拟页面附近的访客虚拟页面的地址一起被识别 地址空间。 每个已识别的客户虚拟页面地址被转换成相应的访客物理页面地址，并且相应的访客物理页面被加载到存储器中。

公开(公告)号：US08364932B2

公开(公告)日：2013-01-29

申请号：US12915236

申请日：2010-10-29

申请人： Qasim Ali ,  Raviprasad Mummidi ,  Vivek Pandey ,  Kiran Tati

发明人： Qasim Ali ,  Raviprasad Mummidi ,  Vivek Pandey ,  Kiran Tati

IPC分类号： G06F12/00 ,  G06F13/00 ,  G06F13/28 ,  G06F21/00 ,  G06F9/46

CPC分类号： G06F12/1009 ,  G06F2212/151 ,  G06F2212/50 ,  G06F2212/651 ,  G06F2212/652

摘要： The prioritization of large memory page mapping is a function of the access bits in the L1 page table. In a first phase of operation, the number of set access bits in each of the L1 page tables is counted periodically and a current count value is calculated therefrom. During the first phase, no pages are mapped large even if identified as such. After the first phase, the current count value is used to prioritize among potential large memory pages to determine which pages to map large. The system continues to calculate the current count value even after the first phase ends. When using hardware assist, the access bits in the nested page tables are used and when using software MMU, the access bits in the shadow page tables are used for large page prioritization.

公开(公告)号：US08359422B2

公开(公告)日：2013-01-22

申请号：US12492766

申请日：2009-06-26

申请人： Qasim Ali ,  Raviprasad Mummidi ,  Kiran Tati

发明人： Qasim Ali ,  Raviprasad Mummidi ,  Kiran Tati

IPC分类号： G06F12/00 ,  G06F13/00 ,  G06F13/28

CPC分类号： G06F12/08 ,  G06F9/455 ,  G06F11/3471 ,  G06F11/3485 ,  G06F12/1009 ,  G06F2201/815

摘要： A system for identifying an exiting process and removing traces and shadow page table pages corresponding to the process' page table pages. An accessed minimum virtual address is maintained corresponding to an address space. In one embodiment, whenever a page table entry corresponding to the accessed minimum virtual address changes from present to not present, the process is determined to be exiting and removal of corresponding trace and shadow page table pages is begun. In a second embodiment, consecutive present to not-present PTE transitions are tracked for guest page tables on a per address space basis. When at least two guest page tables each has at least four consecutive present to not-present PTE transitions, a next present to not-present PTE transition event in the address space leads to the corresponding guest page table trace being dropped and the shadow page table page being removed.

摘要翻译： 用于识别退出处理并移除与进程页表页对应的跟踪和影子页表页的系统。 对应于地址空间维护访问的最小虚拟地址。 在一个实施例中，每当与所访问的最小虚拟地址相对应的页表条目从当前改变为不存在时，则确定该进程正在退出并且开始删除相应的跟踪和影子页表页。 在第二实施例中，针对每个地址空间的访客页表跟踪连续呈现到不存在的PTE转换。 当至少两个访客页表各自具有至少四个连续呈现到不存在的PTE转换时，地址空间中的下一个不存在的PTE转换事件将导致对应的客户页表跟踪被丢弃，并且阴影页表 被删除的页面