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    File system interface for remote direct memory access
    11.
    发明授权
    File system interface for remote direct memory access 有权

    公开(公告)号：US10706005B2

    公开(公告)日：2020-07-07

    申请号：US15836577

    申请日：2017-12-08

    Applicant: VMware, Inc.

    Inventor： Michael Wei ,  Marcos Aguilera ,  Irina Calciu ,  Stanko Novakovic ,  Lalith Suresh ,  Jayneel Gandhi ,  Nadav Amit ,  Pratap Subrahmanyam ,  Xavier Deguillard ,  Kiran Tati ,  Rajesh Venkatasubramanian

    IPC: G06F15/173 ,  G06F16/182

    Abstract: Exemplary methods, apparatuses, and systems include a distributed memory agent within a first node intercepting an operating system request to open a file from an application running on the first node. The request includes a file identifier, which the distributed memory agent transmits to a remote memory manager. The distributed memory agent receives, from the remote memory manager, a memory location within a second node for the file identifier and information to establish a remote direct memory access channel between the first node and the second node. In response to the request to open the file, the distributed memory agent establishes the remote direct memory access channel between the first node and the second node. The remote direct memory access channel allows the first node to read directly from or write directly to the memory location within the second node while bypassing an operating system of the second node.

    Application High Availability via Crash-Consistent Asynchronous Replication of Persistent Data
    13.
    发明申请
    Application High Availability via Crash-Consistent Asynchronous Replication of Persistent Data 审中-公开

    公开(公告)号：US20190129800A1

    公开(公告)日：2019-05-02

    申请号：US15881514

    申请日：2018-01-26

    Applicant: VMware, Inc.

    Inventor： Pratap Subrahmanyam ,  Rajesh Venkatasubramanian ,  Kiran Tati ,  Qasim Ali ,  Marcos Aguilera ,  Irina Calciu ,  Venkata Subhash Reddy Peddamallu ,  Xavier Deguillard ,  Yi Yao

    IPC: G06F11/14

    Abstract: Techniques for achieving application high availability via crash-consistent asynchronous replication of persistent data are provided. In one set of embodiments, an application running on a computer system can, during runtime of the application: write persistent data to a local nonvolatile data store of the computer system, write one or more log entries comprising the persistent data to a local log region of the computer system, and asynchronously copy the one or more log entries to one or more remote destinations. Then, upon detecting a failure that prevents the application from continuing execution, the computer system can copy the local log region or a remaining portion thereof to the one or more remote destinations, where the copying is performed while the computer system runs on battery power and where the application is restarted on another computer system using a persistent state derived from the copied log entries.

    Coherence-based cache-line Copy-on-Write
    14.
    发明授权
    Coherence-based cache-line Copy-on-Write 有权

    公开(公告)号：US11544194B1

    公开(公告)日：2023-01-03

    申请号：US17488028

    申请日：2021-09-28

    Applicant: VMware, Inc.

    Inventor： Irina Calciu ,  Andreas Nowatzyk ,  Pratap Subrahmanyam

    IPC: G06F12/00 ,  G06F12/084

    Abstract: A method of performing a copy-on-write on a shared memory page is carried out by a device communicating with a processor via a coherence interconnect. The method includes: adding a page table entry so that a request to read a first cache line of the shared memory page includes a cache-line address of the shared memory page and a request to write to a second cache line of the shared memory page includes a cache-line address of a new memory page; in response to the request to write to the second cache line, storing new data of the second cache line in a second memory and associating the second cache-line address with the new data stored in the second memory; and in response to a request to read the second cache line, reading the new data of the second cache line from the second memory.

    USER-SPACE REMOTE MEMORY PAGING
    15.
    发明申请
    USER-SPACE REMOTE MEMORY PAGING 有权

    公开(公告)号：US20220398199A1

    公开(公告)日：2022-12-15

    申请号：US17348529

    申请日：2021-06-15

    Applicant: VMware, Inc.

    Inventor： Irina Calciu ,  Muhammad Talha Imran ,  Nadav Amit

    IPC: G06F12/0882 ,  G06F12/1045 ,  G06F12/02 ,  G06F9/50 ,  G06F11/07 ,  G06F15/173

    Abstract: Techniques for implementing user-space remote memory paging are provided. In one set of embodiments, these techniques include a user-space remote memory paging (RMP) runtime that can: (1) pre-allocate one or more regions of remote memory for use by an application; (2) at a time of receiving/intercepting a memory allocation function call invoked by the application, map the virtual memory address range of the allocated local memory to a portion of the pre-allocated remote memory; (3) at a time of detecting a page fault directed to a page that is mapped to remote memory, retrieve the page via Remote Direct Memory Access (RDMA) from its remote memory location and store the retrieved page in a local main memory cache; and (4) on a periodic basis, identify pages in the local main memory cache that are candidates for eviction and write out the identified pages via RDMA to their mapped remote memory locations if they have been modified.

    Programming interfaces for accurate dirty data tracking
    16.
    发明授权
    Programming interfaces for accurate dirty data tracking 有权

    公开(公告)号：US11099991B2

    公开(公告)日：2021-08-24

    申请号：US16256562

    申请日：2019-01-24

    Applicant: VMware, Inc.

    Inventor： Aasheesh Kolli ,  Irina Calciu ,  Jayneel Gandhi ,  Pratap Subrahmanyam

    IPC: G06F12/08 ,  G06F12/0817 ,  G06F12/0864

    Abstract: Described herein is a method for tracking changes to memory locations made by an application. In one embodiment, the application decides to start tracking and sends a list of virtual memory pages to be tracked to an operating system via an interface. The operating system converts the list of virtual memory pages to a list of physical addresses and sends the list of physical addresses to a hardware unit which performs the tracking by detecting write backs on a coherence interconnect coupled to the hardware unit. After the application ends tracking, the application requests a list of dirty cache lines. In response to the request, the operating system obtains the list of dirty cache lines from the hardware unit and adds the list to a buffer that the application can read. In other embodiments, the operating system can perform the tracking without the application making the request.

    Smart prefetching for remote memory
    19.
    发明授权
    Smart prefetching for remote memory 有权

    公开(公告)号：US12019554B2

    公开(公告)日：2024-06-25

    申请号：US17872744

    申请日：2022-07-25

    Applicant: VMware, Inc.

    Inventor： Irina Calciu ,  Andreas Nowatzyk ,  Isam Wadih Akkawi ,  Venkata Subhash Reddy Peddamallu ,  Pratap Subrahmanyam

    IPC: G06F12/0862

    CPC classification number: G06F12/0862 ,  G06F2212/602

    Abstract: A method of prefetching memory pages from remote memory includes detecting that a cache-line access made by a processor executing an application program is an access to a cache line containing page table data of the application program, identifying data pages that are referenced by the page table data, initiating a fetch of a data page, which is one of the identified data pages, and starting a timer. If the fetch completes prior to expiration of the timer, the data page is stored in a local memory. On the other hand, if the fetch does not complete prior to expiration of timer, a presence bit of the data page in the page table data is set to indicate that the data page is not present.

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