公开(公告)号：US10834255B1

公开(公告)日：2020-11-10

申请号：US16748734

申请日：2020-01-21

Applicant: VMware, Inc.

Inventor： Nadav Amit ,  Frederick Joseph Jacobs ,  Michael Wei

IPC: H04M1/64 ,  H04M3/42 ,  H04M3/523 ,  H04M3/51

Abstract: A method redirecting an indirect call in a call table to direct call includes the steps of: recording frequencies of calls in a frequency table; updating a search trampoline to cache, as direct calls, calls of the call table that are most frequently made according to the recorded calls in the frequency table; receiving a request to perform one of the calls in the call table; performing a search of the search trampoline to determine whether or not the requested call is cached in the search trampoline; if the requested call is cached in the search trampoline, performing the requested call that is cached in the search trampoline; and if the requested call is not cached in the search trampoline, performing the requested call by accessing the call via the call table.

公开(公告)号：US10824717B2

公开(公告)日：2020-11-03

申请号：US16004191

申请日：2018-06-08

Applicant: VMware, Inc.

Inventor： Michael Wei ,  Dan Tsafrir ,  Nadav Amit

IPC: G06F21/54 ,  G06F21/57 ,  G06F21/52 ,  G06F12/1009 ,  G06F12/14 ,  G06F21/74

Abstract: In accordance with embodiments of the present disclosure, a binary translator can perform address shifting on the binary code of an executing application. Address shifting serves to shift the addresses of memory operations that can access locations in the kernel address space into address locations in the user space, thus avoiding speculative access into the kernel address space.

公开(公告)号：US20200226060A1

公开(公告)日：2020-07-16

申请号：US16246416

申请日：2019-01-11

Applicant: VMware, Inc.

Inventor： Michael Wei ,  Maithem Munshed ,  Anny Martinez Manzanilla ,  Zeeshan Altaf Lokhandwala ,  Saeed A. Behnam ,  Medhavi Dhawan ,  Dahlia Malkhi

IPC: G06F12/02 ,  G06F3/06

Abstract: A log unit provides a shared log for recording updates on data objects. Garbage collection is performed locally and in-place by the log unit. In a marking portion of the garbage collection process, the log unit identifies and marks log entries that record mergeable updates. In a deallocation portion of the process, the log unit merges one or more mergeable log entries and deallocates at least portions of the merged log entries.

公开(公告)号：US20200186455A1

公开(公告)日：2020-06-11

申请号：US16211027

申请日：2018-12-05

Applicant: VMware, Inc.

Inventor： Zeeshan Lokhandwala ,  Medhavi Dhawan ,  Dahlia Malkhi ,  Michael Wei ,  Maithem Munshed ,  Ragnar Edholm

IPC: H04L12/26 ,  H04L12/24 ,  H04L12/707

Abstract: Techniques for implementing dynamic timeout-based fault detection in a distributed system are provided. In one set of embodiments, a node of the distributed system can set a timeout interval to a minimum value and transmit poll messages to other nodes in the distributed system. The node can further wait for acknowledgement messages from all of the other nodes, where the acknowledgement messages are responsive to the poll messages, and can check whether it has received the acknowledgement messages from all of the other nodes within the timeout interval. If the node has failed to receive an acknowledgement message from at least one of the other nodes within the timeout interval and if the timeout interval is less than a maximum value, the node can increment the timeout interval by a delta value and can repeat the setting, the transmitting, the waiting, and the checking steps.

公开(公告)号：US10574571B2

公开(公告)日：2020-02-25

申请号：US15789819

申请日：2017-10-20

Applicant: VMware, Inc.

Inventor： Michael Wei ,  Ke Wang

IPC: H04L12/721 ,  H04L29/06 ,  H04L12/801 ,  H04L12/26 ,  H04L29/08

Abstract: The disclosure provides an approach for transferring a packet from a source client to a destination application across a network. The approach generally includes writing an identifier to the packet by a switch, transferring the packet to a distributed log, logging a copy of the packet at the distributed log, and analyzing the packet for misplaced requests. The approach further includes, transmitting the packet from the distributed log to the destination, intercepting the packet by a shim layer and comparing the identifier to a counter maintained by the shim layer, and forwarding the packet to the destination application.

公开(公告)号：US20230089659A1

公开(公告)日：2023-03-23

申请号：US17478063

申请日：2021-09-17

Applicant: VMware, Inc.

Inventor： Ali Najafi ,  Michael Wei ,  Andreas Georg Nowatzyk ,  Amy Tai

IPC: H04J3/06 ,  G06F11/30 ,  G06F1/14

Abstract: Described herein are systems, methods, and software to manage time calibration associated with an oscillator of a computing system. In one example, a computing system monitors clock cycles for an oscillator on the computing system, receives timing messages from a server, and calculates the frequency of the oscillator at intervals based on the monitored clock cycles and timing messages. The computing system further identifies a temperature from a temperature sensor at each of the intervals and generates a function to demonstrate frequency of the oscillator versus temperatures from the temperature sensor based on the identified temperatures and frequencies at the intervals.

公开(公告)号：US11321242B2

公开(公告)日：2022-05-03

申请号：US17021834

申请日：2020-09-15

Applicant: VMware, Inc.

Inventor： Michael Wei ,  Nadav Amit ,  Amy Tai

IPC: G06F12/1027 ,  G06F12/0804 ,  G06F9/48 ,  G06F12/1009

Abstract: Techniques for implementing early acknowledgement for translation lookaside buffer (TLB) shootdowns are provided. In one set of embodiments, a first (i.e., remote) processing core of a computer system can receive an inter-processor interrupt (IPI) from a second (i.e., initiator) processing core of the computer system for performing a TLB shootdown of the first processing core. Upon receiving the IPI, an interrupt handler of the first processing core can communicate an acknowledgement to the second processing core that the TLB of the first processing core has been flushed, prior to actually flushing the TLB.

公开(公告)号：US20220083476A1

公开(公告)日：2022-03-17

申请号：US17021834

申请日：2020-09-15

Applicant: VMware, Inc.

Inventor： Michael Wei ,  Nadav Amit ,  Amy Tai

IPC: G06F12/1027 ,  G06F12/0804 ,  G06F12/1009 ,  G06F9/48

Abstract: Techniques for implementing early acknowledgement for translation lookaside buffer (TLB) shootdowns are provided. In one set of embodiments, a first (i.e., remote) processing core of a computer system can receive an inter-processor interrupt (IPI) from a second (i.e., initiator) processing core of the computer system for performing a TLB shootdown of the first processing core. Upon receiving the IPI, an interrupt handler of the first processing core can communicate an acknowledgement to the second processing core that the TLB of the first processing core has been flushed, prior to actually flushing the TLB.

公开(公告)号：US10990730B2

公开(公告)日：2021-04-27

申请号：US16030551

申请日：2018-07-09

Applicant: VMware, Inc.

Inventor： Eric Schkufza ,  Michael Wei

IPC: G06F30/331 ,  G06F9/455

Abstract: A method for implementing a distributed hardware system includes retrieving a hardware design described in a hardware description language, where the hardware design includes a plurality of modules. The method includes sending modules of the design to software engines, where the runtime software maintains for each module being simulated an update queue and evaluate queue. The update queue contains events that update stateful objects in the module and cause evaluation events to be enqueued onto the evaluate queue, while the evaluate queue contains evaluate events that update stateless objects and cause update events to be enqueued onto the update queue. Having a update and evaluate queues for each module permits the runtime to manage module simulations so that the executions of each module run concurrently with each other.

公开(公告)号：US20210026785A1

公开(公告)日：2021-01-28

申请号：US16519616

申请日：2019-07-23

Applicant: VMware, Inc.

Inventor： Michael Wei ,  Nadav Amit

IPC: G06F12/14 ,  G06F12/0882 ,  G06F9/455 ,  G06F21/12 ,  G06F21/54

Abstract: One or more kernel-modifying procedures are stored in a trusted computing base (TCB) when bringing up a guest operating system (OS) on a virtual machine (VM) on a virtualization platform. When the guest OS invokes an OS-level kernel-modifying procedure, a call is made to the hypervisor. If the hypervisor determines the TCB to be valid, the kernel-modifying procedure in the TCB that corresponds to the OS-level kernel-modifying procedure is invoked so that the kernel code can be modified.