A memory snapshot management method, device, equipment and medium

Abstract

The present application discloses a memory snapshot management method, device, device and medium, including: when a memory snapshot generation command is obtained, suspending the virtual machine; copying the secondary page table of the virtual machine to obtain the first snapshot page table, And set the read-only flag for the page table entry of the secondary page table; obtain the corresponding memory page through the page table entry of the first snapshot page table, and increase the reference count of the memory page, and set the virtual The machine resumes from the suspended state to the running state. It can be seen that after the application obtains the memory snapshot generation command, the memory snapshot of the virtual machine is created by copying the second-level page table of the virtual machine, and the created memory snapshot is still stored in the memory without writing to the disk, which avoids memory The impact of data writing to disk on the actual operation, thus improving the creation speed of memory snapshots.

Description

technical field [0001] The invention relates to the technical field of data protection in a cloud computing environment, in particular to a memory snapshot management method, device, equipment and medium. Background technique [0002] Currently, in the common virtual machine (Virtual Machine) memory snapshot solution, the virtual machine monitor needs to suspend the virtual machine first, and then export the current memory data of the virtual machine to the disk; since the memory data needs to be written to the disk, The operation of performing memory snapshots on virtual machines is very slow, which affects the use of memory snapshots in real-world scenarios. [0003] To sum up, it can be seen that how to avoid the impact of writing the memory data to the disk on the actual operation and improve the creation speed of the memory snapshot is a problem to be solved at present. Contents of the invention [0004] In view of this, the purpose of the present invention is to pro...

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Problems solved by technology

[0002] Currently, in the common virtual machine (Virtual Machine) memory snapshot solution, the virtual machine monitor needs to suspend the virtual machine first, and then export the current memory data of the virtual machine to the disk; since the memory data needs to be written to the disk, The operation of performing memory snapshots on virtual machines is very slow, which affects the use of memory snapshots in real-world scenarios

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