公开(公告)号：US12072804B2

公开(公告)日：2024-08-27

申请号：US18083356

申请日：2022-12-16

Applicant: VMware, Inc.

Inventor： Aidan Cully ,  Duan Veljko ,  Husheng Zhou ,  Hyojong Kim

IPC: G06F12/08 ,  G06F12/0815

CPC classification number: G06F12/0815

Abstract: A coherence protocol applied to memory pages maintains coherence between memory spaces on a plurality of nodes so that the threads of the runtime are operable on any of the nodes. The nodes operating according to the coherence protocol track a state and an epoch number for each memory page residing therein. The states include a modified state in which only one particular node has an up-to-date copy of the memory page, an exclusive state in which only one particular node owns the memory page, a shared state in which all nodes that have the memory page in the shared state have the same copy, and a lost state in which the memory page cannot be either read or written. The epoch number is a number that is incremented each time the page enters the modified state and is used to determine whether the page contains data that is stale.