公开(公告)号：US11620192B2

公开(公告)日：2023-04-04

申请号：US16926520

申请日：2020-07-10

Applicant: VMware, Inc.

Inventor： Andreas Nowatzyk ,  Pratap Subrahmanyam ,  Isam Akkawi

IPC: G06F12/0815 ,  G06F15/173 ,  G06F11/14 ,  G06F11/07 ,  G06F9/30 ,  G06F9/46

Abstract: Techniques for implementing hardware-assisted memory disaggregation with recovery from network failures/problems are provided. In one set of embodiments, a hardware controller of a computer system can maintain a copy of a “remote memory” of the computer system (i.e., a section of the physical memory address space of the computer system that maps to a portion of the physical system memory of a remote computer system) in a local backup memory. The backup memory may be implemented using a non-volatile memory that is slower, but also less expensive, than conventional dynamic random-access memory (DRAM). Then, if the hardware controller is unable to retrieve data in the remote memory from the remote computer system within a specified time window due to, e.g., a network failure or other problem, the hardware controller can retrieve the data from the backup memory, thereby avoiding a hardware error condition (and potential application/system crash).

公开(公告)号：US11586545B2

公开(公告)日：2023-02-21

申请号：US17367048

申请日：2021-07-02

Applicant: VMware, Inc.

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

IPC: G06F12/0862

Abstract: Memory pages of a local application program are prefetched from a memory of a remote host. A method of prefetching the memory pages from the remote memory includes detecting that a cache-line access made by a processor executing the local application program is an access to a cache line containing page table data of the local application program, identifying data pages that are referenced by the page table data, and fetching the identified data pages from the remote memory and storing the fetched data pages in a local memory.

公开(公告)号：US20230033029A1

公开(公告)日：2023-02-02

申请号：US17382839

申请日：2021-07-22

Applicant: VMware, Inc.

Inventor： Marcos Kawazoe Aguilera ,  Renu Raman ,  Pratap Subrahmanyam ,  Praveen Vegulla ,  Rajesh Venkatasubramanian

IPC: G06F12/0811 ,  G06F12/0882 ,  G06F12/0871 ,  G06F12/02

Abstract: Disclosed are various embodiments for optimized memory tiering. A first page can be allocated in a first memory for a process, the first memory being associated with a first memory tier. Accesses of the first page by the process during execution of the process can be monitored. Then, accesses of the first page by the process during execution of the process can be compared to an allocation policy to make a first determination to move the contents of the first page from the first memory to a second memory associated with a second memory tier. Next, the contents of the first page can be copied from the first memory to a second page in the second memory in response to the first determination.

公开(公告)号：US20220398014A1

公开(公告)日：2022-12-15

申请号：US17344514

申请日：2021-06-10

Applicant: VMware, Inc.

Inventor： Emmanuel Amaro Ramirez ,  Marcos Kawazoe Aguilera ,  Pratap Subrahmanyam ,  Rajesh Venkatasubramanian

IPC: G06F3/06

Abstract: Disclosed are various embodiments for high throughput reclamation of pages in memory. A first plurality of pages in a memory of the computing device are identified to reclaim. In addition, a second plurality of pages in the memory of the computing device are identified to reclaim. The first plurality of pages are prepared for storage on a swap device of the computing device. Then, a write request is submitted to a swap device to store the first plurality of pages. After submission of the write request, the second plurality of pages are prepared for storage on the swap device while the swap device completes the write request.

公开(公告)号：US10929235B2

公开(公告)日：2021-02-23

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 ,  G06F16/27 ,  G06F1/26 ,  G06F11/20

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.

公开(公告)号：US10929234B2

公开(公告)日：2021-02-23

申请号：US15881480

申请日：2018-01-26

Applicant: VMware, Inc.

Inventor： Kiran Tati ,  Qasim Ali ,  Wei Xu ,  Rajesh Venkatasubramanian ,  Pratap Subrahmanyam

IPC: G06F11/14 ,  G06F16/27 ,  G06F1/26 ,  G06F11/20

Abstract: Techniques for implementing application fault tolerance via battery-backed replication of volatile state are provided. In one set of embodiments, a primary host system can detect a failure that causes an application of the primary host system to stop running. In response to detecting the failure, the primary host system can replicate volatile state that is used by the application to a secondary host system, where the secondary host system maintains a copy of the application, and where execution of the application is failed over to the copy on the secondary host system using the replicated volatile state.

公开(公告)号：US20210019168A1

公开(公告)日：2021-01-21

申请号：US16698994

申请日：2019-11-28

Applicant: VMWARE, INC.

Inventor： Marcos Aguilera ,  Keerthi Kumar ,  Pramod Kumar ,  Arun Ramanathan ,  Pratap Subrahmanyam ,  Sairam Veeraswamy ,  Rajesh Venkatasubramanian ,  Manish Mishra

IPC: G06F9/455 ,  G06F3/06 ,  G06F12/1009 ,  G06F16/907

Abstract: The disclosure provides an approach for creating a pool of memory out of local memories of host machines, and providing that pool for the hosts to use. The pool is managed by a controller that keeps track of memory usage and allocated memory among hosts. The controller allocates or reclaims memory between hosts, as needed by the hosts. Memory allocated from a second host to a first host may then be divided into smaller portions by the first host, and further allocated to virtual machines executing within the first host.

公开(公告)号：US10817389B2

公开(公告)日：2020-10-27

申请号：US16256567

申请日：2019-01-24

Applicant: VMware, Inc.

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

IPC: G06F11/14

Abstract: A module for rewriting application code as a failure-atomic transaction is disclosed. An application delineates a code fragment that is to become a failure-atomic transaction by writing a tx_begin( ) and tx_end( ) functions into its code. A module detects the tx_begin( ) and tx_end( ) functions and rewrites the code fragment as a failure-atomic transaction. The rewritten code is then available to be executed by the application. The rewritten code stores values and locations of stores to persistent memory locations so that the transaction can be either undone or redone in the case of an application error or a power failure. If the transaction is an undo type of transaction, the application can be rolled back to a state prior to the failure. If the transaction is a redo type of transaction, the application can be advanced to a correct state after the error.

公开(公告)号：US10528436B2

公开(公告)日：2020-01-07

申请号：US15192940

申请日：2016-06-24

Applicant: VMware, Inc.

Inventor： Pratap Subrahmanyam ,  Zongwei Zhou ,  Xavier Deguillard ,  Rajesh Venkatasubramanian

IPC: G06F16/30 ,  G06F11/14 ,  G06F16/23

Abstract: Techniques for using micro-journals to ensure crash consistency of a transactional application are provided. In one embodiment, a computer system can receive a transaction associated with the transactional application, where the transaction includes a plurality of modifications to data or metadata of the transactional application. The computer system can further select a free micro-journal from a pool of micro-journals, where the pool of micro-journals are stored in a byte-addressable persistent memory of the computer system, and where each micro-journal in the pool is configured to record journal entries for a single transaction at a time. The computer system can then write journal entries into the micro-journal corresponding to the plurality of modifications included in the transaction and commit the journal entries to the byte-addressable persistent memory.

公开(公告)号：US20200004735A1

公开(公告)日：2020-01-02

申请号：US16560951

申请日：2019-09-04

Applicant: VMware, Inc.

Inventor： Pratap Subrahmanyam ,  Zongwei Zhou ,  Xavier Deguillard ,  Rajesh Venkatasubramanian

IPC: G06F16/23

Abstract: Techniques for using commit coalescing when performing micro-journal-based transaction logging are provided. In one embodiment a computer system can maintain, in a volatile memory, a globally ascending identifier, a first list of free micro-journals, and a second list of in-flight micro-journals. The computer system can further receive a transaction comprising a plurality of modifications to data or metadata stored in the byte-addressable persistent memory, select a micro-journal from the first list, obtain a lock on the globally ascending identifier, write a current value of the globally ascending identifier as a journal commit identifier into a header of the micro-journal, and write journal entries into the micro-journal corresponding to the plurality of modifications included in the transaction. The computer system can then commit the micro-journal to the byte-addressable persistent memory, increment the current value of the globally ascending identifier, and release the lock.