公开(公告)号：US11188370B2

公开(公告)日：2021-11-30

申请号：US16256968

申请日：2019-01-24

Applicant: VMware, Inc.

Inventor： Julien Freche ,  Philip Peter Moltmann ,  Jui-Hao Chiang

IPC: G06F9/455 ,  G06F9/50 ,  G06F12/1009 ,  G06F9/48

Abstract: A memory scheduler in a hypervisor allocates physical memory to virtual machines (VMs) based on memory usages metrics generated within the VMs and provided to the hypervisor. More particularly, the memory scheduler determines an allocation target for each VM based on a guest-generated memory usage metric associated with the VM. The allocation target can be increased or decreased from its previous value to reflect changing needs in the VM. Physical memory is allocated when a VM requests it, and is reclaimed during a reclamation process based on its associated allocation target.

公开(公告)号：US10691591B2

公开(公告)日：2020-06-23

申请号：US16174264

申请日：2018-10-29

Applicant: VMware, Inc.

Inventor： Kiran Tati ,  Xavier Deguillard ,  Ishan Banerjee ,  Julien Freche ,  Preeti Agarwal ,  Rajesh Venkatasubramanian

IPC: G06F13/00 ,  G06F12/02 ,  G06F12/0804

Abstract: Techniques for efficiently purging non-active blocks in an NVM region of an NVM device using pointer elimination are provided. In one set of embodiments, a host system can, for each level 1 (L1) page table entry of each snapshot of the NVM region, determine whether a data block of the NVM region that is pointed to by the L1 page table entry is a non-active block, and if the data block is a non-active block, remove a pointer to the data block in the L1 page table entry and reduce a reference count parameter associated with the data block by 1. If the reference count parameter has reached zero at this point, the host system purge the data block from the NVM device to the mass storage device.

公开(公告)号：US20190065091A1

公开(公告)日：2019-02-28

申请号：US15693292

申请日：2017-08-31

Applicant: VMware, Inc.

Inventor： Kiran Tati ,  Preeti Agarwal ,  Julien Freche ,  Xavier Deguillard ,  Rajesh Venkatasubramanian ,  Ishan Banerjee

IPC: G06F3/06

Abstract: Techniques for using non-volatile random access memory (NVM) as volatile random access memory (RAM) are provided. In one set of embodiments, a computer system can detect that an amount of free space in a volatile RAM of the computer system has become low and, in response, can add one or more memory pages from an unused portion of an NVM of the computer system to the system's volatile RAM pool. Conversely, the computer system can detect that an amount of free space in the NVM has become low and, in response, can return the one or more memory pages from the volatile RAM pool back to the NVM.

公开(公告)号：US11782828B2

公开(公告)日：2023-10-10

申请号：US17571417

申请日：2022-01-07

Applicant: VMware, Inc.

Inventor： Xavier Deguillard ,  Ishan Banerjee ,  Julien Freche ,  Kiran Tati ,  Preeti Agarwal ,  Rajesh Venkatasubramanian

IPC: G06F12/00 ,  G06F12/02 ,  G06F12/1009 ,  G06F12/0804

CPC classification number: G06F12/0253 ,  G06F12/0804 ,  G06F12/1009 ,  G06F2212/1044 ,  G06F2212/202 ,  G06F2212/657

Abstract: Techniques for efficiently purging non-active blocks in an NVM region of an NVM device using virtblocks are provided. In one set of embodiments, a host system can maintain, in the NVM device, a pointer entry (i.e., virtblock entry) for each allocated data block of the NVM region, where page table entries of the NVM region that refer to the allocated data block include pointers to the pointer entry, and where the pointer entry includes a pointer to the allocated data block. The host system can further determine that a subset of the allocated data blocks of the NVM region are non-active blocks and can purge the non-active blocks from the NVM device to a mass storage device, where the purging comprises updating the pointer entry for each non-active block to point to a storage location of the non-active block on the mass storage device.

公开(公告)号：US11249900B2

公开(公告)日：2022-02-15

申请号：US16174249

申请日：2018-10-29

Applicant: VMware, Inc.

Inventor： Xavier Deguillard ,  Ishan Banerjee ,  Julien Freche ,  Kiran Tati ,  Preeti Agarwal ,  Rajesh Venkatasubramanian

IPC: G06F12/00 ,  G06F12/02 ,  G06F12/1009 ,  G06F12/0804

Abstract: Techniques for efficiently purging non-active blocks in an NVM region of an NVM device using virtblocks are provided. In one set of embodiments, a host system can maintain, in the NVM device, a pointer entry (i.e., virtblock entry) for each allocated data block of the NVM region, where page table entries of the NVM region that refer to the allocated data block include pointers to the pointer entry, and where the pointer entry includes a pointer to the allocated data block. The host system can further determine that a subset of the allocated data blocks of the NVM region are non-active blocks and can purge the non-active blocks from the NVM device to a mass storage device, where the purging comprises updating the pointer entry for each non-active block to point to a storage location of the non-active block on the mass storage device.

公开(公告)号：US11182182B2

公开(公告)日：2021-11-23

申请号：US16521380

申请日：2019-07-24

Applicant: VMware, Inc.

Inventor： Julien Freche ,  Ashish Kaila ,  Lorenzo David ,  Abhishek Srivastava ,  Nahim El Atmani

IPC: G06F9/455 ,  G06F11/36 ,  G06F8/41

Abstract: A method of probing a computer system includes steps of compiling a script that includes a call to a first function with first parameters, to generate executable code that includes a call to a second function with second parameters, wherein the second function and the second parameters are specified as values of the first parameters of the first function in the call to the first function, injecting the executable code into an executing module of the computer system, and as the executing module is running, executing the executable code to call the second function.

公开(公告)号：US11093403B2

公开(公告)日：2021-08-17

申请号：US16209119

申请日：2018-12-04

Applicant: VMware, Inc.

Inventor： Wenguang Wang ,  Abhishek Srivastava ,  Ashish Kaila ,  Julien Freche

IPC: G06F12/0871

Abstract: The disclosure provides a technique for reducing cache misses to a cache of a computer system. The technique includes deallocating memory pages of the cache from one process and allocating those memory pages to another process based on cache misses of each process during a given time period. Repeating the technique leads the total number of cache misses to the cache to gradually decrease to an optimum or near optimum level. The repetition of the technique leads to a dynamic and flexible apportionment of cache memory pages to processes running within the computer system.

公开(公告)号：US20200241902A1

公开(公告)日：2020-07-30

申请号：US16256968

申请日：2019-01-24

Applicant: VMware, Inc.

Inventor： Julien Freche ,  Philip Peter Moltmann ,  Jui-Hao Chiang

IPC: G06F9/455 ,  G06F9/48 ,  G06F9/50 ,  G06F12/1009

Abstract: A memory scheduler in a hypervisor allocates physical memory to virtual machines (VMs) based on memory usages metrics generated within the VMs and provided to the hypervisor. More particularly, the memory scheduler determines an allocation target for each VM based on a guest-generated memory usage metric associated with the VM. The allocation target can be increased or decreased from its previous value to reflect changing needs in the VM. Physical memory is allocated when a VM requests it, and is reclaimed during a reclamation process based on its associated allocation target.